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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.70 by root, Tue Nov 6 00:52:32 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 <unistd.h>
		60	#include <fcntl.h>
		61	#include <signal.h>
		62	#include <stddef.h>
3		63
4	#include <stdio.h>	64	#include <stdio.h>
5		65
6	#include <assert.h>	66	#include <assert.h>
7	#include <errno.h>	67	#include <errno.h>
		68	#include <sys/types.h>
		69	#ifndef WIN32
		70	# include <sys/wait.h>
		71	#endif
8	#include <sys/time.h>	72	#include <sys/time.h>
9	#include <time.h>	73	#include <time.h>
10		74
		75	/**/
		76
		77	#ifndef EV_USE_MONOTONIC
		78	# define EV_USE_MONOTONIC 1
		79	#endif
		80
		81	#ifndef EV_USE_SELECT
		82	# define EV_USE_SELECT 1
		83	#endif
		84
		85	#ifndef EV_USE_POLL
		86	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		87	#endif
		88
		89	#ifndef EV_USE_EPOLL
		90	# define EV_USE_EPOLL 0
		91	#endif
		92
		93	#ifndef EV_USE_KQUEUE
		94	# define EV_USE_KQUEUE 0
		95	#endif
		96
		97	#ifndef EV_USE_WIN32
		98	# ifdef WIN32
		99	# define EV_USE_WIN32 1
		100	# else
		101	# define EV_USE_WIN32 0
		102	# endif
		103	#endif
		104
		105	#ifndef EV_USE_REALTIME
		106	# define EV_USE_REALTIME 1
		107	#endif
		108
		109	/**/
		110
11	#ifdef CLOCK_MONOTONIC	111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	113	# define EV_USE_MONOTONIC 0
13	#endif	114	#endif
14		115
15	#define HAVE_EPOLL 1	116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	119	#endif
		120
		121	/**/
18		122
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	123	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	124	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		125	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		126	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		127
22	#include "ev.h"	128	#include "ev.h"
23		129
		130	#if __GNUC__ >= 3
		131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
		137
		138	#define expect_false(expr) expect ((expr) != 0, 0)
		139	#define expect_true(expr) expect ((expr) != 0, 1)
		140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		143
24	struct ev_watcher {	144	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
		147
		148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		149
		150	#if WIN32
		151	/* note: the comment below could not be substantiated, but what would I care */
		152	/* MSDN says this is required to handle SIGFPE */
		153	volatile double SIGFPE_REQ = 0.0f;
		154	#endif
		155
		156	/*****************************************************************************/
		157
		158	static void (*syserr_cb)(const char *msg);
		159
		160	void ev_set_syserr_cb (void (*cb)(const char *msg))
		161	{
		162	syserr_cb = cb;
		163	}
		164
		165	static void
		166	syserr (const char *msg)
		167	{
		168	if (!msg)
		169	msg = "(libev) system error";
		170
		171	if (syserr_cb)
		172	syserr_cb (msg);
		173	else
		174	{
		175	perror (msg);
		176	abort ();
		177	}
		178	}
		179
		180	static void *(*alloc)(void *ptr, long size);
		181
		182	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		183	{
		184	alloc = cb;
		185	}
		186
		187	static void *
		188	ev_realloc (void *ptr, long size)
		189	{
		190	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		191
		192	if (!ptr && size)
		193	{
		194	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		195	abort ();
		196	}
		197
		198	return ptr;
		199	}
		200
		201	#define ev_malloc(size) ev_realloc (0, (size))
		202	#define ev_free(ptr) ev_realloc ((ptr), 0)
		203
		204	/*****************************************************************************/
		205
		206	typedef struct
		207	{
		208	WL head;
		209	unsigned char events;
		210	unsigned char reify;
		211	} ANFD;
		212
		213	typedef struct
		214	{
		215	W w;
		216	int events;
		217	} ANPENDING;
		218
		219	#if EV_MULTIPLICITY
		220
		221	struct ev_loop
		222	{
		223	# define VAR(name,decl) decl;
		224	# include "ev_vars.h"
26	};	225	};
		226	# undef VAR
		227	# include "ev_wrap.h"
27		228
28	struct ev_watcher_list {	229	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		230
32	static ev_tstamp now, diff; /* monotonic clock */	231	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	232	# include "ev_vars.h"
34	int ev_method;	233	# undef VAR
35		234
36	static int have_monotonic; /* runtime */	235	#endif
37		236
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	237	/*****************************************************************************/
39	static void (*method_reify)(void);
40	static void (*method_poll)(ev_tstamp timeout);
41		238
42	ev_tstamp	239	inline ev_tstamp
43	ev_time (void)	240	ev_time (void)
44	{	241	{
45	#if HAVE_REALTIME	242	#if EV_USE_REALTIME
46	struct timespec ts;	243	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	244	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	245	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	246	#else
50	struct timeval tv;	247	struct timeval tv;
51	gettimeofday (&tv, 0);	248	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	249	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	250	#endif
54	}	251	}
55		252
56	static ev_tstamp	253	inline ev_tstamp
57	get_clock (void)	254	get_clock (void)
58	{	255	{
59	#if HAVE_MONOTONIC	256	#if EV_USE_MONOTONIC
60	if (have_monotonic)	257	if (expect_true (have_monotonic))
61	{	258	{
62	struct timespec ts;	259	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	260	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	261	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	262	}
66	#endif	263	#endif
67		264
68	return ev_time ();	265	return ev_time ();
69	}	266	}
70		267
		268	ev_tstamp
		269	ev_now (EV_P)
		270	{
		271	return rt_now;
		272	}
		273
		274	#define array_roundsize(base,n) ((n) | 4 & ~3)
		275
71	#define array_needsize(base,cur,cnt,init) \	276	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	277	if (expect_false ((cnt) > cur)) \
73	{ \	278	{ \
74	int newcnt = cur ? cur << 1 : 16; \	279	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	280	do \
		281	{ \
		282	newcnt = array_roundsize (base, newcnt << 1); \
		283	} \
		284	while ((cnt) > newcnt); \
		285	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	286	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	287	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	288	cur = newcnt; \
79	}	289	}
80		290
81	typedef struct	291	#define array_slim(stem) \
82	{	292	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	293	{ \
84	unsigned char wev, rev; /* want, received event set */	294	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	295	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		296	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		297	}
86		298
87	static ANFD *anfds;	299	#define array_free(stem, idx) \
88	static int anfdmax;	300	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		301
90	static int *fdchanges;	302	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		303
93	static void	304	static void
94	anfds_init (ANFD *base, int count)	305	anfds_init (ANFD *base, int count)
95	{	306	{
96	while (count--)	307	while (count--)
97	{	308	{
98	base->head = 0;	309	base->head = 0;
99	base->wev = base->rev = EV_NONE;	310	base->events = EV_NONE;
		311	base->reify = 0;
		312
100	++base;	313	++base;
101	}	314	}
102	}	315	}
103		316
104	typedef struct
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void	317	static void
114	event (struct ev_watcher *w, int events)	318	event (EV_P_ W w, int events)
115	{	319	{
		320	if (w->pending)
		321	{
		322	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		323	return;
		324	}
		325
116	w->pending = ++pendingcnt;	326	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	327	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	328	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	329	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	330	}
121		331
122	static void	332	static void
		333	queue_events (EV_P_ W *events, int eventcnt, int type)
		334	{
		335	int i;
		336
		337	for (i = 0; i < eventcnt; ++i)
		338	event (EV_A_ events [i], type);
		339	}
		340
		341	static void
123	fd_event (int fd, int events)	342	fd_event (EV_P_ int fd, int events)
124	{	343	{
125	ANFD *anfd = anfds + fd;	344	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	345	struct ev_io *w;
127		346
128	for (w = anfd->head; w; w = w->next)	347	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	348	{
130	int ev = w->events & events;	349	int ev = w->events & events;
131		350
132	if (ev)	351	if (ev)
133	event ((struct ev_watcher *)w, ev);	352	event (EV_A_ (W)w, ev);
		353	}
		354	}
		355
		356	/*****************************************************************************/
		357
		358	static void
		359	fd_reify (EV_P)
		360	{
		361	int i;
		362
		363	for (i = 0; i < fdchangecnt; ++i)
		364	{
		365	int fd = fdchanges [i];
		366	ANFD *anfd = anfds + fd;
		367	struct ev_io *w;
		368
		369	int events = 0;
		370
		371	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		372	events |= w->events;
		373
		374	anfd->reify = 0;
		375
		376	method_modify (EV_A_ fd, anfd->events, events);
		377	anfd->events = events;
		378	}
		379
		380	fdchangecnt = 0;
		381	}
		382
		383	static void
		384	fd_change (EV_P_ int fd)
		385	{
		386	if (anfds [fd].reify)
		387	return;
		388
		389	anfds [fd].reify = 1;
		390
		391	++fdchangecnt;
		392	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		393	fdchanges [fdchangecnt - 1] = fd;
		394	}
		395
		396	static void
		397	fd_kill (EV_P_ int fd)
		398	{
		399	struct ev_io *w;
		400
		401	while ((w = (struct ev_io *)anfds [fd].head))
		402	{
		403	ev_io_stop (EV_A_ w);
		404	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		405	}
		406	}
		407
		408	/* called on EBADF to verify fds */
		409	static void
		410	fd_ebadf (EV_P)
		411	{
		412	int fd;
		413
		414	for (fd = 0; fd < anfdmax; ++fd)
		415	if (anfds [fd].events)
		416	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		417	fd_kill (EV_A_ fd);
		418	}
		419
		420	/* called on ENOMEM in select/poll to kill some fds and retry */
		421	static void
		422	fd_enomem (EV_P)
		423	{
		424	int fd;
		425
		426	for (fd = anfdmax; fd--; )
		427	if (anfds [fd].events)
		428	{
		429	fd_kill (EV_A_ fd);
		430	return;
134	}	431	}
135	}	432	}
136		433
137	static struct ev_timer **atimers;	434	/* usually called after fork if method needs to re-arm all fds from scratch */
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void	435	static void
144	upheap (struct ev_timer **timers, int k)	436	fd_rearm_all (EV_P)
145	{	437	{
146	struct ev_timer *w = timers [k];	438	int fd;
147		439
		440	/* this should be highly optimised to not do anything but set a flag */
		441	for (fd = 0; fd < anfdmax; ++fd)
		442	if (anfds [fd].events)
		443	{
		444	anfds [fd].events = 0;
		445	fd_change (EV_A_ fd);
		446	}
		447	}
		448
		449	/*****************************************************************************/
		450
		451	static void
		452	upheap (WT *heap, int k)
		453	{
		454	WT w = heap [k];
		455
148	while (k && timers [k >> 1]->at > w->at)	456	while (k && heap [k >> 1]->at > w->at)
149	{	457	{
150	timers [k] = timers [k >> 1];	458	heap [k] = heap [k >> 1];
151	timers [k]->active = k + 1;	459	((W)heap [k])->active = k + 1;
152	k >>= 1;	460	k >>= 1;
153	}	461	}
154		462
155	timers [k] = w;	463	heap [k] = w;
156	timers [k]->active = k + 1;	464	((W)heap [k])->active = k + 1;
157		465
158	}	466	}
159		467
160	static void	468	static void
161	downheap (struct ev_timer **timers, int N, int k)	469	downheap (WT *heap, int N, int k)
162	{	470	{
163	struct ev_timer *w = timers [k];	471	WT w = heap [k];
164		472
165	while (k < (N >> 1))	473	while (k < (N >> 1))
166	{	474	{
167	int j = k << 1;	475	int j = k << 1;
168		476
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	477	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
170	++j;	478	++j;
171		479
172	if (w->at <= timers [j]->at)	480	if (w->at <= heap [j]->at)
173	break;	481	break;
174		482
175	timers [k] = timers [j];	483	heap [k] = heap [j];
176	timers [k]->active = k + 1;	484	((W)heap [k])->active = k + 1;
177	k = j;	485	k = j;
178	}	486	}
179		487
180	timers [k] = w;	488	heap [k] = w;
181	timers [k]->active = k + 1;	489	((W)heap [k])->active = k + 1;
182	}	490	}
183		491
184	static struct ev_signal **signals;	492	/*****************************************************************************/
		493
		494	typedef struct
		495	{
		496	WL head;
		497	sig_atomic_t volatile gotsig;
		498	} ANSIG;
		499
		500	static ANSIG *signals;
185	static int signalmax;	501	static int signalmax;
186		502
		503	static int sigpipe [2];
		504	static sig_atomic_t volatile gotsig;
		505	static struct ev_io sigev;
		506
187	static void	507	static void
188	signals_init (struct ev_signal **base, int count)	508	signals_init (ANSIG *base, int count)
189	{	509	{
190	while (count--)	510	while (count--)
191	*base++ = 0;	511	{
192	}	512	base->head = 0;
		513	base->gotsig = 0;
193		514
		515	++base;
		516	}
		517	}
		518
		519	static void
		520	sighandler (int signum)
		521	{
		522	#if WIN32
		523	signal (signum, sighandler);
		524	#endif
		525
		526	signals [signum - 1].gotsig = 1;
		527
		528	if (!gotsig)
		529	{
		530	int old_errno = errno;
		531	gotsig = 1;
		532	write (sigpipe [1], &signum, 1);
		533	errno = old_errno;
		534	}
		535	}
		536
		537	static void
		538	sigcb (EV_P_ struct ev_io *iow, int revents)
		539	{
		540	WL w;
		541	int signum;
		542
		543	read (sigpipe [0], &revents, 1);
		544	gotsig = 0;
		545
		546	for (signum = signalmax; signum--; )
		547	if (signals [signum].gotsig)
		548	{
		549	signals [signum].gotsig = 0;
		550
		551	for (w = signals [signum].head; w; w = w->next)
		552	event (EV_A_ (W)w, EV_SIGNAL);
		553	}
		554	}
		555
		556	static void
		557	siginit (EV_P)
		558	{
		559	#ifndef WIN32
		560	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		561	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		562
		563	/* rather than sort out wether we really need nb, set it */
		564	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		565	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		566	#endif
		567
		568	ev_io_set (&sigev, sigpipe [0], EV_READ);
		569	ev_io_start (EV_A_ &sigev);
		570	ev_unref (EV_A); /* child watcher should not keep loop alive */
		571	}
		572
		573	/*****************************************************************************/
		574
		575	#ifndef WIN32
		576
		577	static struct ev_child *childs [PID_HASHSIZE];
		578	static struct ev_signal childev;
		579
		580	#ifndef WCONTINUED
		581	# define WCONTINUED 0
		582	#endif
		583
		584	static void
		585	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		586	{
		587	struct ev_child *w;
		588
		589	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		590	if (w->pid == pid || !w->pid)
		591	{
		592	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		593	w->rpid = pid;
		594	w->rstatus = status;
		595	event (EV_A_ (W)w, EV_CHILD);
		596	}
		597	}
		598
		599	static void
		600	childcb (EV_P_ struct ev_signal *sw, int revents)
		601	{
		602	int pid, status;
		603
		604	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		605	{
		606	/* make sure we are called again until all childs have been reaped */
		607	event (EV_A_ (W)sw, EV_SIGNAL);
		608
		609	child_reap (EV_A_ sw, pid, pid, status);
		610	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		611	}
		612	}
		613
		614	#endif
		615
		616	/*****************************************************************************/
		617
		618	#if EV_USE_KQUEUE
		619	# include "ev_kqueue.c"
		620	#endif
194	#if HAVE_EPOLL	621	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	622	# include "ev_epoll.c"
196	#endif	623	#endif
		624	#if EV_USE_POLL
		625	# include "ev_poll.c"
		626	#endif
197	#if HAVE_SELECT	627	#if EV_USE_SELECT
198	# include "ev_select.c"	628	# include "ev_select.c"
199	#endif	629	#endif
200		630
201	int ev_init (int flags)	631	int
		632	ev_version_major (void)
202	{	633	{
		634	return EV_VERSION_MAJOR;
		635	}
		636
		637	int
		638	ev_version_minor (void)
		639	{
		640	return EV_VERSION_MINOR;
		641	}
		642
		643	/* return true if we are running with elevated privileges and should ignore env variables */
		644	static int
		645	enable_secure (void)
		646	{
		647	#ifdef WIN32
		648	return 0;
		649	#else
		650	return getuid () != geteuid ()
		651	|| getgid () != getegid ();
		652	#endif
		653	}
		654
		655	int
		656	ev_method (EV_P)
		657	{
		658	return method;
		659	}
		660
		661	static void
		662	loop_init (EV_P_ int methods)
		663	{
		664	if (!method)
		665	{
203	#if HAVE_MONOTONIC	666	#if EV_USE_MONOTONIC
204	{	667	{
205	struct timespec ts;	668	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	669	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	670	have_monotonic = 1;
208	}	671	}
209	#endif	672	#endif
210		673
211	ev_now = ev_time ();	674	rt_now = ev_time ();
212	now = get_clock ();	675	mn_now = get_clock ();
213	diff = ev_now - now;	676	now_floor = mn_now;
		677	rtmn_diff = rt_now - mn_now;
214		678
		679	if (methods == EVMETHOD_AUTO)
		680	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		681	methods = atoi (getenv ("LIBEV_METHODS"));
		682	else
		683	methods = EVMETHOD_ANY;
		684
		685	method = 0;
		686	#if EV_USE_WIN32
		687	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		688	#endif
		689	#if EV_USE_KQUEUE
		690	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		691	#endif
215	#if HAVE_EPOLL	692	#if EV_USE_EPOLL
216	if (epoll_init (flags))	693	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
217	return ev_method;
218	#endif	694	#endif
		695	#if EV_USE_POLL
		696	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		697	#endif
219	#if HAVE_SELECT	698	#if EV_USE_SELECT
220	if (select_init (flags))	699	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
221	return ev_method;
222	#endif	700	#endif
223		701
224	ev_method = EVMETHOD_NONE;	702	ev_watcher_init (&sigev, sigcb);
225	return ev_method;	703	ev_set_priority (&sigev, EV_MAXPRI);
		704	}
226	}	705	}
227		706
228	void ev_prefork (void)	707	void
229	{	708	loop_destroy (EV_P)
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	epoll_postfork_child ();
240	#endif
241	}
242
243	static void
244	call_pending ()
245	{	709	{
246	int i;	710	int i;
247		711
248	for (i = 0; i < pendingcnt; ++i)	712	#if EV_USE_WIN32
		713	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		714	#endif
		715	#if EV_USE_KQUEUE
		716	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		717	#endif
		718	#if EV_USE_EPOLL
		719	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		720	#endif
		721	#if EV_USE_POLL
		722	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		723	#endif
		724	#if EV_USE_SELECT
		725	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		726	#endif
		727
		728	for (i = NUMPRI; i--; )
		729	array_free (pending, [i]);
		730
		731	array_free (fdchange, );
		732	array_free (timer, );
		733	array_free (periodic, );
		734	array_free (idle, );
		735	array_free (prepare, );
		736	array_free (check, );
		737
		738	method = 0;
		739	}
		740
		741	static void
		742	loop_fork (EV_P)
		743	{
		744	#if EV_USE_EPOLL
		745	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		746	#endif
		747	#if EV_USE_KQUEUE
		748	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		749	#endif
		750
		751	if (ev_is_active (&sigev))
		752	{
		753	/* default loop */
		754
		755	ev_ref (EV_A);
		756	ev_io_stop (EV_A_ &sigev);
		757	close (sigpipe [0]);
		758	close (sigpipe [1]);
		759
		760	while (pipe (sigpipe))
		761	syserr ("(libev) error creating pipe");
		762
		763	siginit (EV_A);
249	{	764	}
250	ANPENDING *p = pendings + i;
251		765
252	if (p->w)	766	postfork = 0;
		767	}
		768
		769	#if EV_MULTIPLICITY
		770	struct ev_loop *
		771	ev_loop_new (int methods)
		772	{
		773	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		774
		775	memset (loop, 0, sizeof (struct ev_loop));
		776
		777	loop_init (EV_A_ methods);
		778
		779	if (ev_method (EV_A))
		780	return loop;
		781
		782	return 0;
		783	}
		784
		785	void
		786	ev_loop_destroy (EV_P)
		787	{
		788	loop_destroy (EV_A);
		789	ev_free (loop);
		790	}
		791
		792	void
		793	ev_loop_fork (EV_P)
		794	{
		795	postfork = 1;
		796	}
		797
		798	#endif
		799
		800	#if EV_MULTIPLICITY
		801	struct ev_loop default_loop_struct;
		802	static struct ev_loop *default_loop;
		803
		804	struct ev_loop *
		805	#else
		806	static int default_loop;
		807
		808	int
		809	#endif
		810	ev_default_loop (int methods)
		811	{
		812	if (sigpipe [0] == sigpipe [1])
		813	if (pipe (sigpipe))
		814	return 0;
		815
		816	if (!default_loop)
		817	{
		818	#if EV_MULTIPLICITY
		819	struct ev_loop *loop = default_loop = &default_loop_struct;
		820	#else
		821	default_loop = 1;
		822	#endif
		823
		824	loop_init (EV_A_ methods);
		825
		826	if (ev_method (EV_A))
253	{	827	{
254	p->w->pending = 0;	828	siginit (EV_A);
255	p->w->cb (p->w, p->events);	829
		830	#ifndef WIN32
		831	ev_signal_init (&childev, childcb, SIGCHLD);
		832	ev_set_priority (&childev, EV_MAXPRI);
		833	ev_signal_start (EV_A_ &childev);
		834	ev_unref (EV_A); /* child watcher should not keep loop alive */
		835	#endif
256	}	836	}
		837	else
		838	default_loop = 0;
		839	}
		840
		841	return default_loop;
		842	}
		843
		844	void
		845	ev_default_destroy (void)
		846	{
		847	#if EV_MULTIPLICITY
		848	struct ev_loop *loop = default_loop;
		849	#endif
		850
		851	ev_ref (EV_A); /* child watcher */
		852	ev_signal_stop (EV_A_ &childev);
		853
		854	ev_ref (EV_A); /* signal watcher */
		855	ev_io_stop (EV_A_ &sigev);
		856
		857	close (sigpipe [0]); sigpipe [0] = 0;
		858	close (sigpipe [1]); sigpipe [1] = 0;
		859
		860	loop_destroy (EV_A);
		861	}
		862
		863	void
		864	ev_default_fork (void)
		865	{
		866	#if EV_MULTIPLICITY
		867	struct ev_loop *loop = default_loop;
		868	#endif
		869
		870	if (method)
		871	postfork = 1;
		872	}
		873
		874	/*****************************************************************************/
		875
		876	static void
		877	call_pending (EV_P)
		878	{
		879	int pri;
		880
		881	for (pri = NUMPRI; pri--; )
		882	while (pendingcnt [pri])
		883	{
		884	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		885
		886	if (p->w)
		887	{
		888	p->w->pending = 0;
		889	p->w->cb (EV_A_ p->w, p->events);
		890	}
257	}	891	}
258
259	pendingcnt = 0;
260	}	892	}
261		893
262	static void	894	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	895	timers_reify (EV_P)
264	{	896	{
265	while (timercnt && timers [0]->at <= now)	897	while (timercnt && ((WT)timers [0])->at <= mn_now)
266	{	898	{
267	struct ev_timer *w = timers [0];	899	struct ev_timer *w = timers [0];
		900
		901	assert (("inactive timer on timer heap detected", ev_is_active (w)));
268		902
269	/* first reschedule or stop timer */	903	/* first reschedule or stop timer */
270	if (w->repeat)	904	if (w->repeat)
271	{	905	{
272	if (w->is_abs)	906	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
274	else
275	w->at = now + w->repeat;	907	((WT)w)->at = mn_now + w->repeat;
276
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	908	downheap ((WT *)timers, timercnt, 0);
280	}	909	}
281	else	910	else
		911	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		912
		913	event (EV_A_ (W)w, EV_TIMEOUT);
		914	}
		915	}
		916
		917	static void
		918	periodics_reify (EV_P)
		919	{
		920	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		921	{
		922	struct ev_periodic *w = periodics [0];
		923
		924	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		925
		926	/* first reschedule or stop timer */
		927	if (w->interval)
282	{	928	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	929	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
284	--timercnt; /* maybe pass by reference instead? */	930	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		931	downheap ((WT *)periodics, periodiccnt, 0);
285	}	932	}
		933	else
		934	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
286		935
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	936	event (EV_A_ (W)w, EV_PERIODIC);
288	}	937	}
289	}	938	}
290		939
291	static void	940	static void
292	time_update ()	941	periodics_reschedule (EV_P)
293	{	942	{
294	int i;	943	int i;
295	ev_now = ev_time ();
296		944
297	if (have_monotonic)	945	/* adjust periodics after time jump */
		946	for (i = 0; i < periodiccnt; ++i)
298	{	947	{
299	ev_tstamp odiff = diff;	948	struct ev_periodic *w = periodics [i];
300		949
301	/* detecting time jumps is much more difficult */	950	if (w->interval)
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */
303	{	951	{
304	now = get_clock ();	952	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
305	diff = ev_now - now;
306		953
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	954	if (fabs (diff) >= 1e-4)
308	return; /* all is well */	955	{
		956	ev_periodic_stop (EV_A_ w);
		957	ev_periodic_start (EV_A_ w);
309		958
310	ev_now = ev_time ();	959	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		960	}
311	}	961	}
		962	}
		963	}
312		964
313	/* time jump detected, reschedule atimers */	965	inline int
314	for (i = 0; i < atimercnt; ++i)	966	time_update_monotonic (EV_P)
		967	{
		968	mn_now = get_clock ();
		969
		970	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		971	{
		972	rt_now = rtmn_diff + mn_now;
		973	return 0;
		974	}
		975	else
		976	{
		977	now_floor = mn_now;
		978	rt_now = ev_time ();
		979	return 1;
		980	}
		981	}
		982
		983	static void
		984	time_update (EV_P)
		985	{
		986	int i;
		987
		988	#if EV_USE_MONOTONIC
		989	if (expect_true (have_monotonic))
		990	{
		991	if (time_update_monotonic (EV_A))
315	{	992	{
316	struct ev_timer *w = atimers [i];	993	ev_tstamp odiff = rtmn_diff;
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	994
		995	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		996	{
		997	rtmn_diff = rt_now - mn_now;
		998
		999	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1000	return; /* all is well */
		1001
		1002	rt_now = ev_time ();
		1003	mn_now = get_clock ();
		1004	now_floor = mn_now;
		1005	}
		1006
		1007	periodics_reschedule (EV_A);
		1008	/* no timer adjustment, as the monotonic clock doesn't jump */
		1009	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
318	}	1010	}
319	}	1011	}
320	else	1012	else
		1013	#endif
321	{	1014	{
322	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1015	rt_now = ev_time ();
323	/* time jump detected, adjust rtimers */	1016
		1017	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1018	{
		1019	periodics_reschedule (EV_A);
		1020
		1021	/* adjust timers. this is easy, as the offset is the same for all */
324	for (i = 0; i < rtimercnt; ++i)	1022	for (i = 0; i < timercnt; ++i)
325	rtimers [i]->at += ev_now - now;	1023	((WT)timers [i])->at += rt_now - mn_now;
		1024	}
326		1025
327	now = ev_now;	1026	mn_now = rt_now;
328	}	1027	}
329	}	1028	}
330		1029
331	int ev_loop_done;	1030	void
		1031	ev_ref (EV_P)
		1032	{
		1033	++activecnt;
		1034	}
332		1035
		1036	void
		1037	ev_unref (EV_P)
		1038	{
		1039	--activecnt;
		1040	}
		1041
		1042	static int loop_done;
		1043
		1044	void
333	void ev_loop (int flags)	1045	ev_loop (EV_P_ int flags)
334	{	1046	{
335	double block;	1047	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	1048	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
337		1049
338	do	1050	do
339	{	1051	{
		1052	/* queue check watchers (and execute them) */
		1053	if (expect_false (preparecnt))
		1054	{
		1055	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1056	call_pending (EV_A);
		1057	}
		1058
		1059	/* we might have forked, so reify kernel state if necessary */
		1060	if (expect_false (postfork))
		1061	loop_fork (EV_A);
		1062
340	/* update fd-related kernel structures */	1063	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	1064	fd_reify (EV_A);
342		1065
343	/* calculate blocking time */	1066	/* calculate blocking time */
		1067
		1068	/* we only need this for !monotonic clockor timers, but as we basically
		1069	always have timers, we just calculate it always */
		1070	#if EV_USE_MONOTONIC
		1071	if (expect_true (have_monotonic))
		1072	time_update_monotonic (EV_A);
		1073	else
		1074	#endif
		1075	{
		1076	rt_now = ev_time ();
		1077	mn_now = rt_now;
		1078	}
		1079
344	if (flags & EVLOOP_NONBLOCK)	1080	if (flags & EVLOOP_NONBLOCK || idlecnt)
345	block = 0.;	1081	block = 0.;
346	else	1082	else
347	{	1083	{
348	block = MAX_BLOCKTIME;	1084	block = MAX_BLOCKTIME;
349		1085
350	if (rtimercnt)	1086	if (timercnt)
351	{	1087	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1088	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
353	if (block > to) block = to;	1089	if (block > to) block = to;
354	}	1090	}
355		1091
356	if (atimercnt)	1092	if (periodiccnt)
357	{	1093	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1094	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
359	if (block > to) block = to;	1095	if (block > to) block = to;
360	}	1096	}
361		1097
362	if (block < 0.) block = 0.;	1098	if (block < 0.) block = 0.;
363	}	1099	}
364		1100
365	method_poll (block);	1101	method_poll (EV_A_ block);
366		1102
367	/* update ev_now, do magic */	1103	/* update rt_now, do magic */
368	time_update ();	1104	time_update (EV_A);
369		1105
370	/* put pending timers into pendign queue and reschedule them */	1106	/* queue pending timers and reschedule them */
371	/* absolute timers first */	1107	timers_reify (EV_A); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	1108	periodics_reify (EV_A); /* absolute timers called first */
373	/* relative timers second */
374	timers_reify (rtimers, rtimercnt, now);
375		1109
		1110	/* queue idle watchers unless io or timers are pending */
		1111	if (!pendingcnt)
		1112	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1113
		1114	/* queue check watchers, to be executed first */
		1115	if (checkcnt)
		1116	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1117
376	call_pending ();	1118	call_pending (EV_A);
377	}	1119	}
378	while (!ev_loop_done);	1120	while (activecnt && !loop_done);
379	}
380		1121
381	static void	1122	if (loop_done != 2)
382	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1123	loop_done = 0;
		1124	}
		1125
		1126	void
		1127	ev_unloop (EV_P_ int how)
		1128	{
		1129	loop_done = how;
		1130	}
		1131
		1132	/*****************************************************************************/
		1133
		1134	inline void
		1135	wlist_add (WL *head, WL elem)
383	{	1136	{
384	elem->next = *head;	1137	elem->next = *head;
385	*head = elem;	1138	*head = elem;
386	}	1139	}
387		1140
388	static void	1141	inline void
389	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1142	wlist_del (WL *head, WL elem)
390	{	1143	{
391	while (*head)	1144	while (*head)
392	{	1145	{
393	if (*head == elem)	1146	if (*head == elem)
394	{	1147	{
…		…
398		1151
399	head = &(*head)->next;	1152	head = &(*head)->next;
400	}	1153	}
401	}	1154	}
402		1155
403	static void	1156	inline void
404	ev_start (struct ev_watcher *w, int active)	1157	ev_clear_pending (EV_P_ W w)
405	{	1158	{
		1159	if (w->pending)
		1160	{
		1161	pendings [ABSPRI (w)][w->pending - 1].w = 0;
406	w->pending = 0;	1162	w->pending = 0;
		1163	}
		1164	}
		1165
		1166	inline void
		1167	ev_start (EV_P_ W w, int active)
		1168	{
		1169	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1170	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1171
407	w->active = active;	1172	w->active = active;
		1173	ev_ref (EV_A);
408	}	1174	}
409		1175
410	static void	1176	inline void
411	ev_stop (struct ev_watcher *w)	1177	ev_stop (EV_P_ W w)
412	{	1178	{
413	if (w->pending)	1179	ev_unref (EV_A);
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	1180	w->active = 0;
417	/* nop */
418	}	1181	}
419		1182
		1183	/*****************************************************************************/
		1184
420	void	1185	void
421	evio_start (struct ev_io *w)	1186	ev_io_start (EV_P_ struct ev_io *w)
422	{	1187	{
		1188	int fd = w->fd;
		1189
423	if (ev_is_active (w))	1190	if (ev_is_active (w))
424	return;	1191	return;
425		1192
426	int fd = w->fd;	1193	assert (("ev_io_start called with negative fd", fd >= 0));
427		1194
428	ev_start ((struct ev_watcher *)w, 1);	1195	ev_start (EV_A_ (W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1196	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1197	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		1198
432	++fdchangecnt;	1199	fd_change (EV_A_ fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	1200	}
436		1201
437	void	1202	void
438	evio_stop (struct ev_io *w)	1203	ev_io_stop (EV_P_ struct ev_io *w)
439	{	1204	{
		1205	ev_clear_pending (EV_A_ (W)w);
440	if (!ev_is_active (w))	1206	if (!ev_is_active (w))
441	return;	1207	return;
442		1208
443	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1209	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
444	ev_stop ((struct ev_watcher *)w);	1210	ev_stop (EV_A_ (W)w);
445		1211
446	++fdchangecnt;	1212	fd_change (EV_A_ w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	1213	}
450		1214
451	void	1215	void
452	evtimer_start (struct ev_timer *w)	1216	ev_timer_start (EV_P_ struct ev_timer *w)
453	{	1217	{
454	if (ev_is_active (w))	1218	if (ev_is_active (w))
455	return;	1219	return;
456		1220
457	if (w->is_abs)	1221	((WT)w)->at += mn_now;
		1222
		1223	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1224
		1225	ev_start (EV_A_ (W)w, ++timercnt);
		1226	array_needsize (timers, timermax, timercnt, );
		1227	timers [timercnt - 1] = w;
		1228	upheap ((WT *)timers, timercnt - 1);
		1229
		1230	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1231	}
		1232
		1233	void
		1234	ev_timer_stop (EV_P_ struct ev_timer *w)
		1235	{
		1236	ev_clear_pending (EV_A_ (W)w);
		1237	if (!ev_is_active (w))
		1238	return;
		1239
		1240	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1241
		1242	if (((W)w)->active < timercnt--)
		1243	{
		1244	timers [((W)w)->active - 1] = timers [timercnt];
		1245	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
458	{	1246	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	1247
		1248	((WT)w)->at = w->repeat;
		1249
		1250	ev_stop (EV_A_ (W)w);
		1251	}
		1252
		1253	void
		1254	ev_timer_again (EV_P_ struct ev_timer *w)
		1255	{
		1256	if (ev_is_active (w))
		1257	{
460	if (w->repeat)	1258	if (w->repeat)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1259	{
		1260	((WT)w)->at = mn_now + w->repeat;
		1261	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1262	}
		1263	else
		1264	ev_timer_stop (EV_A_ w);
		1265	}
		1266	else if (w->repeat)
		1267	ev_timer_start (EV_A_ w);
		1268	}
462		1269
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	1270	void
464	array_needsize (atimers, atimermax, atimercnt, );	1271	ev_periodic_start (EV_P_ struct ev_periodic *w)
465	atimers [atimercnt - 1] = w;	1272	{
466	upheap (atimers, atimercnt - 1);	1273	if (ev_is_active (w))
		1274	return;
		1275
		1276	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1277
		1278	/* this formula differs from the one in periodic_reify because we do not always round up */
		1279	if (w->interval)
		1280	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1281
		1282	ev_start (EV_A_ (W)w, ++periodiccnt);
		1283	array_needsize (periodics, periodicmax, periodiccnt, );
		1284	periodics [periodiccnt - 1] = w;
		1285	upheap ((WT *)periodics, periodiccnt - 1);
		1286
		1287	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1288	}
		1289
		1290	void
		1291	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1292	{
		1293	ev_clear_pending (EV_A_ (W)w);
		1294	if (!ev_is_active (w))
		1295	return;
		1296
		1297	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1298
		1299	if (((W)w)->active < periodiccnt--)
467	}	1300	{
		1301	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1302	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1303	}
		1304
		1305	ev_stop (EV_A_ (W)w);
		1306	}
		1307
		1308	void
		1309	ev_idle_start (EV_P_ struct ev_idle *w)
		1310	{
		1311	if (ev_is_active (w))
		1312	return;
		1313
		1314	ev_start (EV_A_ (W)w, ++idlecnt);
		1315	array_needsize (idles, idlemax, idlecnt, );
		1316	idles [idlecnt - 1] = w;
		1317	}
		1318
		1319	void
		1320	ev_idle_stop (EV_P_ struct ev_idle *w)
		1321	{
		1322	ev_clear_pending (EV_A_ (W)w);
		1323	if (ev_is_active (w))
		1324	return;
		1325
		1326	idles [((W)w)->active - 1] = idles [--idlecnt];
		1327	ev_stop (EV_A_ (W)w);
		1328	}
		1329
		1330	void
		1331	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1332	{
		1333	if (ev_is_active (w))
		1334	return;
		1335
		1336	ev_start (EV_A_ (W)w, ++preparecnt);
		1337	array_needsize (prepares, preparemax, preparecnt, );
		1338	prepares [preparecnt - 1] = w;
		1339	}
		1340
		1341	void
		1342	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1343	{
		1344	ev_clear_pending (EV_A_ (W)w);
		1345	if (ev_is_active (w))
		1346	return;
		1347
		1348	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1349	ev_stop (EV_A_ (W)w);
		1350	}
		1351
		1352	void
		1353	ev_check_start (EV_P_ struct ev_check *w)
		1354	{
		1355	if (ev_is_active (w))
		1356	return;
		1357
		1358	ev_start (EV_A_ (W)w, ++checkcnt);
		1359	array_needsize (checks, checkmax, checkcnt, );
		1360	checks [checkcnt - 1] = w;
		1361	}
		1362
		1363	void
		1364	ev_check_stop (EV_P_ struct ev_check *w)
		1365	{
		1366	ev_clear_pending (EV_A_ (W)w);
		1367	if (ev_is_active (w))
		1368	return;
		1369
		1370	checks [((W)w)->active - 1] = checks [--checkcnt];
		1371	ev_stop (EV_A_ (W)w);
		1372	}
		1373
		1374	#ifndef SA_RESTART
		1375	# define SA_RESTART 0
		1376	#endif
		1377
		1378	void
		1379	ev_signal_start (EV_P_ struct ev_signal *w)
		1380	{
		1381	#if EV_MULTIPLICITY
		1382	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1383	#endif
		1384	if (ev_is_active (w))
		1385	return;
		1386
		1387	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1388
		1389	ev_start (EV_A_ (W)w, 1);
		1390	array_needsize (signals, signalmax, w->signum, signals_init);
		1391	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1392
		1393	if (!((WL)w)->next)
		1394	{
		1395	#if WIN32
		1396	signal (w->signum, sighandler);
		1397	#else
		1398	struct sigaction sa;
		1399	sa.sa_handler = sighandler;
		1400	sigfillset (&sa.sa_mask);
		1401	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1402	sigaction (w->signum, &sa, 0);
		1403	#endif
		1404	}
		1405	}
		1406
		1407	void
		1408	ev_signal_stop (EV_P_ struct ev_signal *w)
		1409	{
		1410	ev_clear_pending (EV_A_ (W)w);
		1411	if (!ev_is_active (w))
		1412	return;
		1413
		1414	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1415	ev_stop (EV_A_ (W)w);
		1416
		1417	if (!signals [w->signum - 1].head)
		1418	signal (w->signum, SIG_DFL);
		1419	}
		1420
		1421	void
		1422	ev_child_start (EV_P_ struct ev_child *w)
		1423	{
		1424	#if EV_MULTIPLICITY
		1425	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1426	#endif
		1427	if (ev_is_active (w))
		1428	return;
		1429
		1430	ev_start (EV_A_ (W)w, 1);
		1431	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1432	}
		1433
		1434	void
		1435	ev_child_stop (EV_P_ struct ev_child *w)
		1436	{
		1437	ev_clear_pending (EV_A_ (W)w);
		1438	if (ev_is_active (w))
		1439	return;
		1440
		1441	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1442	ev_stop (EV_A_ (W)w);
		1443	}
		1444
		1445	/*****************************************************************************/
		1446
		1447	struct ev_once
		1448	{
		1449	struct ev_io io;
		1450	struct ev_timer to;
		1451	void (*cb)(int revents, void *arg);
		1452	void *arg;
		1453	};
		1454
		1455	static void
		1456	once_cb (EV_P_ struct ev_once *once, int revents)
		1457	{
		1458	void (*cb)(int revents, void *arg) = once->cb;
		1459	void *arg = once->arg;
		1460
		1461	ev_io_stop (EV_A_ &once->io);
		1462	ev_timer_stop (EV_A_ &once->to);
		1463	ev_free (once);
		1464
		1465	cb (revents, arg);
		1466	}
		1467
		1468	static void
		1469	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1470	{
		1471	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1472	}
		1473
		1474	static void
		1475	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1476	{
		1477	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1478	}
		1479
		1480	void
		1481	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1482	{
		1483	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
		1484
		1485	if (!once)
		1486	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
468	else	1487	else
469	{	1488	{
470	w->at += now;	1489	once->cb = cb;
		1490	once->arg = arg;
471		1491
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1492	ev_watcher_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1493	if (fd >= 0)
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{	1494	{
490	atimers [w->active - 1] = atimers [atimercnt];	1495	ev_io_set (&once->io, fd, events);
491	downheap (atimers, atimercnt, w->active - 1);	1496	ev_io_start (EV_A_ &once->io);
492	}	1497	}
493	}	1498
494	else	1499	ev_watcher_init (&once->to, once_cb_to);
495	{	1500	if (timeout >= 0.)
496	if (w->active < rtimercnt--)
497	{	1501	{
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1502	ev_timer_set (&once->to, timeout, 0.);
499	downheap (rtimers, rtimercnt, w->active - 1);	1503	ev_timer_start (EV_A_ &once->to);
500	}	1504	}
501	}	1505	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1506	}
505		1507
506	void
507	evsignal_start (struct ev_signal *w)
508	{
509	if (ev_is_active (w))
510	return;
511
512	ev_start ((struct ev_watcher *)w, 1);
513	array_needsize (signals, signalmax, w->signum, signals_init);
514	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
515	}
516
517	void
518	evsignal_stop (struct ev_signal *w)
519	{
520	if (!ev_is_active (w))
521	return;
522
523	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
524	ev_stop ((struct ev_watcher *)w);
525	}
526
527	/*****************************************************************************/
528	#if 1
529
530	static void
531	sin_cb (struct ev_io *w, int revents)
532	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
534	}
535
536	static void
537	ocb (struct ev_timer *w, int revents)
538	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540	evtimer_stop (w);
541	evtimer_start (w);
542	}
543
544	int main (void)
545	{
546	struct ev_io sin;
547
548	ev_init (0);
549
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);
552	evio_start (&sin);
553
554	struct ev_timer t[10000];
555
556	#if 1
557	int i;
558	for (i = 0; i < 10000; ++i)
559	{
560	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);
563	evtimer_start (w);
564	if (drand48 () < 0.5)
565	evtimer_stop (w);
566	}
567	#endif
568
569	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);
573
574	ev_loop (0);
575
576	return 0;
577	}
578
579	#endif
580
581
582
583

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