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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 1.79 by root, Fri Nov 9 15:15:20 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#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);	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
		150
		151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		152
		153	#include "ev_win32.c"
		154
		155	/*****************************************************************************/
		156
		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"
24	};	224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
25		227
26	struct ev_watcher_list {	228	#else
27	EV_WATCHER_LIST (ev_watcher_list);
28	};
29		229
30	ev_tstamp ev_now;	230	# define VAR(name,decl) static decl;
31	int ev_method;	231	# include "ev_vars.h"
		232	# undef VAR
32		233
33	static int have_monotonic; /* runtime */	234	#endif
34		235
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	236	/*****************************************************************************/
36	static void (*method_reify)(void);
37	static void (*method_poll)(ev_tstamp timeout);
38		237
39	ev_tstamp	238	inline ev_tstamp
40	ev_time (void)	239	ev_time (void)
41	{	240	{
42	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
43	struct timespec ts;	242	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	245	#else
47	struct timeval tv;	246	struct timeval tv;
48	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	249	#endif
51	}	250	}
52		251
53	static ev_tstamp	252	inline ev_tstamp
54	get_clock (void)	253	get_clock (void)
55	{	254	{
56	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
57	if (have_monotonic)	256	if (expect_true (have_monotonic))
58	{	257	{
59	struct timespec ts;	258	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	261	}
63	#endif	262	#endif
64		263
65	return ev_time ();	264	return ev_time ();
66	}	265	}
67		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(type,n) ((n) | 4 & ~3)
		274
68	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
70	{ \	277	{ \
71	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	279	do \
		280	{ \
		281	newcnt = array_roundsize (type, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	285	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	287	cur = newcnt; \
76	}	288	}
77		289
78	typedef struct	290	#define array_slim(type,stem) \
79	{	291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	292	{ \
81	unsigned char wev, rev; /* want, received event set */	293	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	294	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		296	}
83		297
84	static ANFD *anfds;	298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	static int anfdmax;	299	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		300	#define array_free_microshit(stem) \
		301	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
86		302
87	static int *fdchanges;	303	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		305
		306	/*****************************************************************************/
89		307
90	static void	308	static void
91	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
92	{	310	{
93	while (count--)	311	while (count--)
94	{	312	{
95	base->head = 0;	313	base->head = 0;
96	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
97	++base;	317	++base;
98	}	318	}
99	}	319	}
100		320
101	typedef struct	321	void
		322	ev_feed_event (EV_P_ void *w, int revents)
102	{	323	{
103	struct ev_watcher *w;	324	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		325
107	static ANPENDING *pendings;	326	if (w_->pending)
108	static int pendingmax, pendingcnt;	327	{
		328	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		329	return;
		330	}
109		331
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	332	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	333	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
115	pendings [pendingcnt - 1].w = w;	334	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	335	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	336	}
118		337
119	static void	338	static void
		339	queue_events (EV_P_ W *events, int eventcnt, int type)
		340	{
		341	int i;
		342
		343	for (i = 0; i < eventcnt; ++i)
		344	ev_feed_event (EV_A_ events [i], type);
		345	}
		346
		347	inline void
120	fd_event (int fd, int events)	348	fd_event (EV_P_ int fd, int revents)
121	{	349	{
122	ANFD *anfd = anfds + fd;	350	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	351	struct ev_io *w;
124		352
125	for (w = anfd->head; w; w = w->next)	353	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	354	{
127	int ev = w->events & events;	355	int ev = w->events & revents;
128		356
129	if (ev)	357	if (ev)
130	event ((struct ev_watcher *)w, ev);	358	ev_feed_event (EV_A_ (W)w, ev);
		359	}
		360	}
		361
		362	void
		363	ev_feed_fd_event (EV_P_ int fd, int revents)
		364	{
		365	fd_event (EV_A_ fd, revents);
		366	}
		367
		368	/*****************************************************************************/
		369
		370	static void
		371	fd_reify (EV_P)
		372	{
		373	int i;
		374
		375	for (i = 0; i < fdchangecnt; ++i)
		376	{
		377	int fd = fdchanges [i];
		378	ANFD *anfd = anfds + fd;
		379	struct ev_io *w;
		380
		381	int events = 0;
		382
		383	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		384	events |= w->events;
		385
		386	anfd->reify = 0;
		387
		388	method_modify (EV_A_ fd, anfd->events, events);
		389	anfd->events = events;
		390	}
		391
		392	fdchangecnt = 0;
		393	}
		394
		395	static void
		396	fd_change (EV_P_ int fd)
		397	{
		398	if (anfds [fd].reify)
		399	return;
		400
		401	anfds [fd].reify = 1;
		402
		403	++fdchangecnt;
		404	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		405	fdchanges [fdchangecnt - 1] = fd;
		406	}
		407
		408	static void
		409	fd_kill (EV_P_ int fd)
		410	{
		411	struct ev_io *w;
		412
		413	while ((w = (struct ev_io *)anfds [fd].head))
		414	{
		415	ev_io_stop (EV_A_ w);
		416	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		417	}
		418	}
		419
		420	static int
		421	fd_valid (int fd)
		422	{
		423	#ifdef WIN32
		424	return !!win32_get_osfhandle (fd);
		425	#else
		426	return fcntl (fd, F_GETFD) != -1;
		427	#endif
		428	}
		429
		430	/* called on EBADF to verify fds */
		431	static void
		432	fd_ebadf (EV_P)
		433	{
		434	int fd;
		435
		436	for (fd = 0; fd < anfdmax; ++fd)
		437	if (anfds [fd].events)
		438	if (!fd_valid (fd) == -1 && errno == EBADF)
		439	fd_kill (EV_A_ fd);
		440	}
		441
		442	/* called on ENOMEM in select/poll to kill some fds and retry */
		443	static void
		444	fd_enomem (EV_P)
		445	{
		446	int fd;
		447
		448	for (fd = anfdmax; fd--; )
		449	if (anfds [fd].events)
		450	{
		451	fd_kill (EV_A_ fd);
		452	return;
131	}	453	}
132	}	454	}
133		455
134	static struct ev_timer **timers;	456	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	457	static void
138	upheap (int k)	458	fd_rearm_all (EV_P)
139	{	459	{
140	struct ev_timer *w = timers [k];	460	int fd;
141		461
		462	/* this should be highly optimised to not do anything but set a flag */
		463	for (fd = 0; fd < anfdmax; ++fd)
		464	if (anfds [fd].events)
		465	{
		466	anfds [fd].events = 0;
		467	fd_change (EV_A_ fd);
		468	}
		469	}
		470
		471	/*****************************************************************************/
		472
		473	static void
		474	upheap (WT *heap, int k)
		475	{
		476	WT w = heap [k];
		477
142	while (k && timers [k >> 1]->at > w->at)	478	while (k && heap [k >> 1]->at > w->at)
143	{	479	{
144	timers [k] = timers [k >> 1];	480	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	481	((W)heap [k])->active = k + 1;
146	k >>= 1;	482	k >>= 1;
147	}	483	}
148		484
149	timers [k] = w;	485	heap [k] = w;
150	timers [k]->active = k + 1;	486	((W)heap [k])->active = k + 1;
151		487
152	}	488	}
153		489
154	static void	490	static void
155	downheap (int k)	491	downheap (WT *heap, int N, int k)
156	{	492	{
157	struct ev_timer *w = timers [k];	493	WT w = heap [k];
158		494
159	while (k < (timercnt >> 1))	495	while (k < (N >> 1))
160	{	496	{
161	int j = k << 1;	497	int j = k << 1;
162		498
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	499	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	500	++j;
165		501
166	if (w->at <= timers [j]->at)	502	if (w->at <= heap [j]->at)
167	break;	503	break;
168		504
169	timers [k] = timers [j];	505	heap [k] = heap [j];
170	timers [k]->active = k + 1;	506	((W)heap [k])->active = k + 1;
171	k = j;	507	k = j;
172	}	508	}
173		509
174	timers [k] = w;	510	heap [k] = w;
175	timers [k]->active = k + 1;	511	((W)heap [k])->active = k + 1;
176	}	512	}
177		513
178	static struct ev_signal **signals;	514	/*****************************************************************************/
		515
		516	typedef struct
		517	{
		518	WL head;
		519	sig_atomic_t volatile gotsig;
		520	} ANSIG;
		521
		522	static ANSIG *signals;
179	static int signalmax, signalcnt;	523	static int signalmax;
180		524
		525	static int sigpipe [2];
		526	static sig_atomic_t volatile gotsig;
		527	static struct ev_io sigev;
		528
181	static void	529	static void
182	signals_init (struct ev_signal **base, int count)	530	signals_init (ANSIG *base, int count)
183	{	531	{
184	while (count--)	532	while (count--)
185	*base++ = 0;	533	{
186	}	534	base->head = 0;
		535	base->gotsig = 0;
187		536
		537	++base;
		538	}
		539	}
		540
		541	static void
		542	sighandler (int signum)
		543	{
		544	#if WIN32
		545	signal (signum, sighandler);
		546	#endif
		547
		548	signals [signum - 1].gotsig = 1;
		549
		550	if (!gotsig)
		551	{
		552	int old_errno = errno;
		553	gotsig = 1;
		554	#ifdef WIN32
		555	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		556	#else
		557	write (sigpipe [1], &signum, 1);
		558	#endif
		559	errno = old_errno;
		560	}
		561	}
		562
		563	void
		564	ev_feed_signal_event (EV_P_ int signum)
		565	{
		566	#if EV_MULTIPLICITY
		567	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		568	#endif
		569
		570	--signum;
		571
		572	if (signum < 0 || signum >= signalmax)
		573	return;
		574
		575	signals [signum].gotsig = 0;
		576
		577	for (w = signals [signum].head; w; w = w->next)
		578	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		579	}
		580
		581	static void
		582	sigcb (EV_P_ struct ev_io *iow, int revents)
		583	{
		584	WL w;
		585	int signum;
		586
		587	#ifdef WIN32
		588	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		589	#else
		590	read (sigpipe [0], &revents, 1);
		591	#endif
		592	gotsig = 0;
		593
		594	for (signum = signalmax; signum--; )
		595	if (signals [signum].gotsig)
		596	sigevent (EV_A_ signum + 1);
		597	}
		598
		599	static void
		600	siginit (EV_P)
		601	{
		602	#ifndef WIN32
		603	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		604	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		605
		606	/* rather than sort out wether we really need nb, set it */
		607	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		608	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		609	#endif
		610
		611	ev_io_set (&sigev, sigpipe [0], EV_READ);
		612	ev_io_start (EV_A_ &sigev);
		613	ev_unref (EV_A); /* child watcher should not keep loop alive */
		614	}
		615
		616	/*****************************************************************************/
		617
		618	static struct ev_child *childs [PID_HASHSIZE];
		619
		620	#ifndef WIN32
		621
		622	static struct ev_signal childev;
		623
		624	#ifndef WCONTINUED
		625	# define WCONTINUED 0
		626	#endif
		627
		628	static void
		629	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		630	{
		631	struct ev_child *w;
		632
		633	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		634	if (w->pid == pid || !w->pid)
		635	{
		636	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		637	w->rpid = pid;
		638	w->rstatus = status;
		639	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		640	}
		641	}
		642
		643	static void
		644	childcb (EV_P_ struct ev_signal *sw, int revents)
		645	{
		646	int pid, status;
		647
		648	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		649	{
		650	/* make sure we are called again until all childs have been reaped */
		651	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		652
		653	child_reap (EV_A_ sw, pid, pid, status);
		654	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		655	}
		656	}
		657
		658	#endif
		659
		660	/*****************************************************************************/
		661
		662	#if EV_USE_KQUEUE
		663	# include "ev_kqueue.c"
		664	#endif
188	#if HAVE_EPOLL	665	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	666	# include "ev_epoll.c"
190	#endif	667	#endif
		668	#if EV_USE_POLL
		669	# include "ev_poll.c"
		670	#endif
191	#if HAVE_SELECT	671	#if EV_USE_SELECT
192	# include "ev_select.c"	672	# include "ev_select.c"
193	#endif	673	#endif
194		674
195	int ev_init (int flags)	675	int
		676	ev_version_major (void)
196	{	677	{
		678	return EV_VERSION_MAJOR;
		679	}
		680
		681	int
		682	ev_version_minor (void)
		683	{
		684	return EV_VERSION_MINOR;
		685	}
		686
		687	/* return true if we are running with elevated privileges and should ignore env variables */
		688	static int
		689	enable_secure (void)
		690	{
		691	#ifdef WIN32
		692	return 0;
		693	#else
		694	return getuid () != geteuid ()
		695	|| getgid () != getegid ();
		696	#endif
		697	}
		698
		699	int
		700	ev_method (EV_P)
		701	{
		702	return method;
		703	}
		704
		705	static void
		706	loop_init (EV_P_ int methods)
		707	{
		708	if (!method)
		709	{
197	#if HAVE_MONOTONIC	710	#if EV_USE_MONOTONIC
198	{	711	{
199	struct timespec ts;	712	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	713	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	714	have_monotonic = 1;
202	}	715	}
203	#endif	716	#endif
204		717
205	ev_now = ev_time ();	718	rt_now = ev_time ();
		719	mn_now = get_clock ();
		720	now_floor = mn_now;
		721	rtmn_diff = rt_now - mn_now;
206		722
		723	if (methods == EVMETHOD_AUTO)
		724	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		725	methods = atoi (getenv ("LIBEV_METHODS"));
		726	else
		727	methods = EVMETHOD_ANY;
		728
		729	method = 0;
		730	#if EV_USE_WIN32
		731	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		732	#endif
		733	#if EV_USE_KQUEUE
		734	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		735	#endif
207	#if HAVE_EPOLL	736	#if EV_USE_EPOLL
208	if (epoll_init (flags))	737	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	738	#endif
		739	#if EV_USE_POLL
		740	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		741	#endif
211	#if HAVE_SELECT	742	#if EV_USE_SELECT
212	if (select_init (flags))	743	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	744	#endif
215		745
216	ev_method = EVMETHOD_NONE;	746	ev_watcher_init (&sigev, sigcb);
217	return ev_method;	747	ev_set_priority (&sigev, EV_MAXPRI);
		748	}
218	}	749	}
219		750
220	void ev_prefork (void)	751	void
221	{	752	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	{	753	{
238	int i;	754	int i;
239		755
240	for (i = 0; i < pendingcnt; ++i)	756	#if EV_USE_WIN32
		757	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		758	#endif
		759	#if EV_USE_KQUEUE
		760	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		761	#endif
		762	#if EV_USE_EPOLL
		763	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		764	#endif
		765	#if EV_USE_POLL
		766	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		767	#endif
		768	#if EV_USE_SELECT
		769	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		770	#endif
		771
		772	for (i = NUMPRI; i--; )
		773	array_free (pending, [i]);
		774
		775	/* have to use the microsoft-never-gets-it-right macro */
		776	array_free_microshit (fdchange);
		777	array_free_microshit (timer);
		778	array_free_microshit (periodic);
		779	array_free_microshit (idle);
		780	array_free_microshit (prepare);
		781	array_free_microshit (check);
		782
		783	method = 0;
		784	}
		785
		786	static void
		787	loop_fork (EV_P)
		788	{
		789	#if EV_USE_EPOLL
		790	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		791	#endif
		792	#if EV_USE_KQUEUE
		793	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		794	#endif
		795
		796	if (ev_is_active (&sigev))
		797	{
		798	/* default loop */
		799
		800	ev_ref (EV_A);
		801	ev_io_stop (EV_A_ &sigev);
		802	close (sigpipe [0]);
		803	close (sigpipe [1]);
		804
		805	while (pipe (sigpipe))
		806	syserr ("(libev) error creating pipe");
		807
		808	siginit (EV_A);
241	{	809	}
242	ANPENDING *p = pendings + i;
243		810
244	if (p->w)	811	postfork = 0;
		812	}
		813
		814	#if EV_MULTIPLICITY
		815	struct ev_loop *
		816	ev_loop_new (int methods)
		817	{
		818	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		819
		820	memset (loop, 0, sizeof (struct ev_loop));
		821
		822	loop_init (EV_A_ methods);
		823
		824	if (ev_method (EV_A))
		825	return loop;
		826
		827	return 0;
		828	}
		829
		830	void
		831	ev_loop_destroy (EV_P)
		832	{
		833	loop_destroy (EV_A);
		834	ev_free (loop);
		835	}
		836
		837	void
		838	ev_loop_fork (EV_P)
		839	{
		840	postfork = 1;
		841	}
		842
		843	#endif
		844
		845	#if EV_MULTIPLICITY
		846	struct ev_loop default_loop_struct;
		847	static struct ev_loop *default_loop;
		848
		849	struct ev_loop *
		850	#else
		851	static int default_loop;
		852
		853	int
		854	#endif
		855	ev_default_loop (int methods)
		856	{
		857	if (sigpipe [0] == sigpipe [1])
		858	if (pipe (sigpipe))
		859	return 0;
		860
		861	if (!default_loop)
		862	{
		863	#if EV_MULTIPLICITY
		864	struct ev_loop *loop = default_loop = &default_loop_struct;
		865	#else
		866	default_loop = 1;
		867	#endif
		868
		869	loop_init (EV_A_ methods);
		870
		871	if (ev_method (EV_A))
245	{	872	{
246	p->w->pending = 0;	873	siginit (EV_A);
247	p->w->cb (p->w, p->events);	874
		875	#ifndef WIN32
		876	ev_signal_init (&childev, childcb, SIGCHLD);
		877	ev_set_priority (&childev, EV_MAXPRI);
		878	ev_signal_start (EV_A_ &childev);
		879	ev_unref (EV_A); /* child watcher should not keep loop alive */
		880	#endif
248	}	881	}
		882	else
		883	default_loop = 0;
		884	}
		885
		886	return default_loop;
		887	}
		888
		889	void
		890	ev_default_destroy (void)
		891	{
		892	#if EV_MULTIPLICITY
		893	struct ev_loop *loop = default_loop;
		894	#endif
		895
		896	#ifndef WIN32
		897	ev_ref (EV_A); /* child watcher */
		898	ev_signal_stop (EV_A_ &childev);
		899	#endif
		900
		901	ev_ref (EV_A); /* signal watcher */
		902	ev_io_stop (EV_A_ &sigev);
		903
		904	close (sigpipe [0]); sigpipe [0] = 0;
		905	close (sigpipe [1]); sigpipe [1] = 0;
		906
		907	loop_destroy (EV_A);
		908	}
		909
		910	void
		911	ev_default_fork (void)
		912	{
		913	#if EV_MULTIPLICITY
		914	struct ev_loop *loop = default_loop;
		915	#endif
		916
		917	if (method)
		918	postfork = 1;
		919	}
		920
		921	/*****************************************************************************/
		922
		923	static int
		924	any_pending (EV_P)
		925	{
		926	int pri;
		927
		928	for (pri = NUMPRI; pri--; )
		929	if (pendingcnt [pri])
		930	return 1;
		931
		932	return 0;
		933	}
		934
		935	static void
		936	call_pending (EV_P)
		937	{
		938	int pri;
		939
		940	for (pri = NUMPRI; pri--; )
		941	while (pendingcnt [pri])
		942	{
		943	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		944
		945	if (p->w)
		946	{
		947	p->w->pending = 0;
		948	p->w->cb (EV_A_ p->w, p->events);
		949	}
249	}	950	}
250
251	pendingcnt = 0;
252	}	951	}
253		952
254	static void	953	static void
255	timer_reify (void)	954	timers_reify (EV_P)
256	{	955	{
257	while (timercnt && timers [0]->at <= ev_now)	956	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	957	{
259	struct ev_timer *w = timers [0];	958	struct ev_timer *w = timers [0];
260		959
		960	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		961
261	/* first reschedule timer */	962	/* first reschedule or stop timer */
262	if (w->repeat)	963	if (w->repeat)
263	{	964	{
264	if (w->is_abs)	965	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;	966	((WT)w)->at = mn_now + w->repeat;
268		967	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	968	}
271	else	969	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	970	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		971
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	972	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		973	}
		974	}
		975
		976	static void
		977	periodics_reify (EV_P)
		978	{
		979	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
275	}	980	{
276	}	981	struct ev_periodic *w = periodics [0];
277		982
278	int ev_loop_done;	983	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		984
		985	/* first reschedule or stop timer */
		986	if (w->reschedule_cb)
		987	{
		988	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
		989
		990	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		991	downheap ((WT *)periodics, periodiccnt, 0);
		992	}
		993	else if (w->interval)
		994	{
		995	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		996	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		997	downheap ((WT *)periodics, periodiccnt, 0);
		998	}
		999	else
		1000	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1001
		1002	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1003	}
		1004	}
		1005
		1006	static void
		1007	periodics_reschedule (EV_P)
		1008	{
		1009	int i;
		1010
		1011	/* adjust periodics after time jump */
		1012	for (i = 0; i < periodiccnt; ++i)
		1013	{
		1014	struct ev_periodic *w = periodics [i];
		1015
		1016	if (w->reschedule_cb)
		1017	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1018	else if (w->interval)
		1019	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1020	}
		1021
		1022	/* now rebuild the heap */
		1023	for (i = periodiccnt >> 1; i--; )
		1024	downheap ((WT *)periodics, periodiccnt, i);
		1025	}
		1026
		1027	inline int
		1028	time_update_monotonic (EV_P)
		1029	{
		1030	mn_now = get_clock ();
		1031
		1032	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1033	{
		1034	rt_now = rtmn_diff + mn_now;
		1035	return 0;
		1036	}
		1037	else
		1038	{
		1039	now_floor = mn_now;
		1040	rt_now = ev_time ();
		1041	return 1;
		1042	}
		1043	}
		1044
		1045	static void
		1046	time_update (EV_P)
		1047	{
		1048	int i;
		1049
		1050	#if EV_USE_MONOTONIC
		1051	if (expect_true (have_monotonic))
		1052	{
		1053	if (time_update_monotonic (EV_A))
		1054	{
		1055	ev_tstamp odiff = rtmn_diff;
		1056
		1057	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1058	{
		1059	rtmn_diff = rt_now - mn_now;
		1060
		1061	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1062	return; /* all is well */
		1063
		1064	rt_now = ev_time ();
		1065	mn_now = get_clock ();
		1066	now_floor = mn_now;
		1067	}
		1068
		1069	periodics_reschedule (EV_A);
		1070	/* no timer adjustment, as the monotonic clock doesn't jump */
		1071	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1072	}
		1073	}
		1074	else
		1075	#endif
		1076	{
		1077	rt_now = ev_time ();
		1078
		1079	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1080	{
		1081	periodics_reschedule (EV_A);
		1082
		1083	/* adjust timers. this is easy, as the offset is the same for all */
		1084	for (i = 0; i < timercnt; ++i)
		1085	((WT)timers [i])->at += rt_now - mn_now;
		1086	}
		1087
		1088	mn_now = rt_now;
		1089	}
		1090	}
		1091
		1092	void
		1093	ev_ref (EV_P)
		1094	{
		1095	++activecnt;
		1096	}
		1097
		1098	void
		1099	ev_unref (EV_P)
		1100	{
		1101	--activecnt;
		1102	}
		1103
		1104	static int loop_done;
		1105
		1106	void
280	int ev_loop (int flags)	1107	ev_loop (EV_P_ int flags)
281	{	1108	{
282	double block;	1109	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1110	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1111
285	do	1112	do
286	{	1113	{
		1114	/* queue check watchers (and execute them) */
		1115	if (expect_false (preparecnt))
		1116	{
		1117	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1118	call_pending (EV_A);
		1119	}
		1120
		1121	/* we might have forked, so reify kernel state if necessary */
		1122	if (expect_false (postfork))
		1123	loop_fork (EV_A);
		1124
287	/* update fd-related kernel structures */	1125	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1126	fd_reify (EV_A);
289		1127
290	/* calculate blocking time */	1128	/* calculate blocking time */
		1129
		1130	/* we only need this for !monotonic clock or timers, but as we basically
		1131	always have timers, we just calculate it always */
		1132	#if EV_USE_MONOTONIC
		1133	if (expect_true (have_monotonic))
		1134	time_update_monotonic (EV_A);
		1135	else
		1136	#endif
		1137	{
291	ev_now = ev_time ();	1138	rt_now = ev_time ();
		1139	mn_now = rt_now;
		1140	}
292		1141
293	if (flags & EVLOOP_NONBLOCK)	1142	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1143	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1144	else
298	{	1145	{
		1146	block = MAX_BLOCKTIME;
		1147
		1148	if (timercnt)
		1149	{
299	block = timers [0]->at - ev_now + method_fudge;	1150	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1151	if (block > to) block = to;
		1152	}
		1153
		1154	if (periodiccnt)
		1155	{
		1156	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
		1157	if (block > to) block = to;
		1158	}
		1159
300	if (block < 0.) block = 0.;	1160	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1161	}
303		1162
304	method_poll (block);	1163	method_poll (EV_A_ block);
305		1164
		1165	/* update rt_now, do magic */
		1166	time_update (EV_A);
		1167
306	/* put pending timers into pendign queue and reschedule them */	1168	/* queue pending timers and reschedule them */
307	timer_reify ();	1169	timers_reify (EV_A); /* relative timers called last */
		1170	periodics_reify (EV_A); /* absolute timers called first */
308		1171
309	ev_now = ev_time ();	1172	/* queue idle watchers unless io or timers are pending */
		1173	if (idlecnt && !any_pending (EV_A))
		1174	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1175
		1176	/* queue check watchers, to be executed first */
		1177	if (checkcnt)
		1178	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1179
310	call_pending ();	1180	call_pending (EV_A);
311	}	1181	}
312	while (!ev_loop_done);	1182	while (activecnt && !loop_done);
313	}
314		1183
315	static void	1184	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1185	loop_done = 0;
		1186	}
		1187
		1188	void
		1189	ev_unloop (EV_P_ int how)
		1190	{
		1191	loop_done = how;
		1192	}
		1193
		1194	/*****************************************************************************/
		1195
		1196	inline void
		1197	wlist_add (WL *head, WL elem)
317	{	1198	{
318	elem->next = *head;	1199	elem->next = *head;
319	*head = elem;	1200	*head = elem;
320	}	1201	}
321		1202
322	static void	1203	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1204	wlist_del (WL *head, WL elem)
324	{	1205	{
325	while (*head)	1206	while (*head)
326	{	1207	{
327	if (*head == elem)	1208	if (*head == elem)
328	{	1209	{
…		…
332		1213
333	head = &(*head)->next;	1214	head = &(*head)->next;
334	}	1215	}
335	}	1216	}
336		1217
337	static void	1218	inline void
338	ev_start (struct ev_watcher *w, int active)	1219	ev_clear_pending (EV_P_ W w)
339	{	1220	{
		1221	if (w->pending)
		1222	{
		1223	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1224	w->pending = 0;
		1225	}
		1226	}
		1227
		1228	inline void
		1229	ev_start (EV_P_ W w, int active)
		1230	{
		1231	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1232	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1233
341	w->active = active;	1234	w->active = active;
		1235	ev_ref (EV_A);
342	}	1236	}
343		1237
344	static void	1238	inline void
345	ev_stop (struct ev_watcher *w)	1239	ev_stop (EV_P_ W w)
346	{	1240	{
347	if (w->pending)	1241	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1242	w->active = 0;
351	/* nop */
352	}	1243	}
353		1244
		1245	/*****************************************************************************/
		1246
354	void	1247	void
355	evio_start (struct ev_io *w)	1248	ev_io_start (EV_P_ struct ev_io *w)
356	{	1249	{
		1250	int fd = w->fd;
		1251
357	if (ev_is_active (w))	1252	if (ev_is_active (w))
358	return;	1253	return;
359		1254
360	int fd = w->fd;	1255	assert (("ev_io_start called with negative fd", fd >= 0));
361		1256
362	ev_start ((struct ev_watcher *)w, 1);	1257	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1258	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1259	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1260
366	++fdchangecnt;	1261	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1262	}
370		1263
371	void	1264	void
372	evio_stop (struct ev_io *w)	1265	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1266	{
		1267	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1268	if (!ev_is_active (w))
375	return;	1269	return;
376		1270
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1271	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1272	ev_stop (EV_A_ (W)w);
379		1273
380	++fdchangecnt;	1274	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1275	}
384		1276
385	void	1277	void
386	evtimer_start (struct ev_timer *w)	1278	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1279	{
388	if (ev_is_active (w))	1280	if (ev_is_active (w))
389	return;	1281	return;
390		1282
391	if (w->is_abs)	1283	((WT)w)->at += mn_now;
		1284
		1285	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1286
		1287	ev_start (EV_A_ (W)w, ++timercnt);
		1288	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1289	timers [timercnt - 1] = w;
		1290	upheap ((WT *)timers, timercnt - 1);
		1291
		1292	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1293	}
		1294
		1295	void
		1296	ev_timer_stop (EV_P_ struct ev_timer *w)
		1297	{
		1298	ev_clear_pending (EV_A_ (W)w);
		1299	if (!ev_is_active (w))
		1300	return;
		1301
		1302	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1303
		1304	if (((W)w)->active < timercnt--)
		1305	{
		1306	timers [((W)w)->active - 1] = timers [timercnt];
		1307	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1308	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1309
		1310	((WT)w)->at = w->repeat;
		1311
		1312	ev_stop (EV_A_ (W)w);
		1313	}
		1314
		1315	void
		1316	ev_timer_again (EV_P_ struct ev_timer *w)
		1317	{
		1318	if (ev_is_active (w))
		1319	{
394	if (w->repeat)	1320	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1321	{
		1322	((WT)w)->at = mn_now + w->repeat;
		1323	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1324	}
		1325	else
		1326	ev_timer_stop (EV_A_ w);
		1327	}
		1328	else if (w->repeat)
		1329	ev_timer_start (EV_A_ w);
		1330	}
		1331
		1332	void
		1333	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1334	{
		1335	if (ev_is_active (w))
		1336	return;
		1337
		1338	if (w->reschedule_cb)
		1339	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1340	else if (w->interval)
396	}	1341	{
		1342	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1343	/* this formula differs from the one in periodic_reify because we do not always round up */
		1344	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1345	}
		1346
		1347	ev_start (EV_A_ (W)w, ++periodiccnt);
		1348	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1349	periodics [periodiccnt - 1] = w;
		1350	upheap ((WT *)periodics, periodiccnt - 1);
		1351
		1352	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1353	}
		1354
		1355	void
		1356	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1357	{
		1358	ev_clear_pending (EV_A_ (W)w);
		1359	if (!ev_is_active (w))
		1360	return;
		1361
		1362	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1363
		1364	if (((W)w)->active < periodiccnt--)
		1365	{
		1366	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1367	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1368	}
		1369
		1370	ev_stop (EV_A_ (W)w);
		1371	}
		1372
		1373	void
		1374	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1375	{
		1376	ev_periodic_stop (EV_A_ w);
		1377	ev_periodic_start (EV_A_ w);
		1378	}
		1379
		1380	void
		1381	ev_idle_start (EV_P_ struct ev_idle *w)
		1382	{
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	ev_start (EV_A_ (W)w, ++idlecnt);
		1387	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1388	idles [idlecnt - 1] = w;
		1389	}
		1390
		1391	void
		1392	ev_idle_stop (EV_P_ struct ev_idle *w)
		1393	{
		1394	ev_clear_pending (EV_A_ (W)w);
		1395	if (ev_is_active (w))
		1396	return;
		1397
		1398	idles [((W)w)->active - 1] = idles [--idlecnt];
		1399	ev_stop (EV_A_ (W)w);
		1400	}
		1401
		1402	void
		1403	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1404	{
		1405	if (ev_is_active (w))
		1406	return;
		1407
		1408	ev_start (EV_A_ (W)w, ++preparecnt);
		1409	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1410	prepares [preparecnt - 1] = w;
		1411	}
		1412
		1413	void
		1414	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1415	{
		1416	ev_clear_pending (EV_A_ (W)w);
		1417	if (ev_is_active (w))
		1418	return;
		1419
		1420	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1421	ev_stop (EV_A_ (W)w);
		1422	}
		1423
		1424	void
		1425	ev_check_start (EV_P_ struct ev_check *w)
		1426	{
		1427	if (ev_is_active (w))
		1428	return;
		1429
		1430	ev_start (EV_A_ (W)w, ++checkcnt);
		1431	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1432	checks [checkcnt - 1] = w;
		1433	}
		1434
		1435	void
		1436	ev_check_stop (EV_P_ struct ev_check *w)
		1437	{
		1438	ev_clear_pending (EV_A_ (W)w);
		1439	if (ev_is_active (w))
		1440	return;
		1441
		1442	checks [((W)w)->active - 1] = checks [--checkcnt];
		1443	ev_stop (EV_A_ (W)w);
		1444	}
		1445
		1446	#ifndef SA_RESTART
		1447	# define SA_RESTART 0
		1448	#endif
		1449
		1450	void
		1451	ev_signal_start (EV_P_ struct ev_signal *w)
		1452	{
		1453	#if EV_MULTIPLICITY
		1454	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1455	#endif
		1456	if (ev_is_active (w))
		1457	return;
		1458
		1459	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1460
		1461	ev_start (EV_A_ (W)w, 1);
		1462	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1463	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1464
		1465	if (!((WL)w)->next)
		1466	{
		1467	#if WIN32
		1468	signal (w->signum, sighandler);
		1469	#else
		1470	struct sigaction sa;
		1471	sa.sa_handler = sighandler;
		1472	sigfillset (&sa.sa_mask);
		1473	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1474	sigaction (w->signum, &sa, 0);
		1475	#endif
		1476	}
		1477	}
		1478
		1479	void
		1480	ev_signal_stop (EV_P_ struct ev_signal *w)
		1481	{
		1482	ev_clear_pending (EV_A_ (W)w);
		1483	if (!ev_is_active (w))
		1484	return;
		1485
		1486	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1487	ev_stop (EV_A_ (W)w);
		1488
		1489	if (!signals [w->signum - 1].head)
		1490	signal (w->signum, SIG_DFL);
		1491	}
		1492
		1493	void
		1494	ev_child_start (EV_P_ struct ev_child *w)
		1495	{
		1496	#if EV_MULTIPLICITY
		1497	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1498	#endif
		1499	if (ev_is_active (w))
		1500	return;
		1501
		1502	ev_start (EV_A_ (W)w, 1);
		1503	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1504	}
		1505
		1506	void
		1507	ev_child_stop (EV_P_ struct ev_child *w)
		1508	{
		1509	ev_clear_pending (EV_A_ (W)w);
		1510	if (ev_is_active (w))
		1511	return;
		1512
		1513	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1514	ev_stop (EV_A_ (W)w);
		1515	}
		1516
		1517	/*****************************************************************************/
		1518
		1519	struct ev_once
		1520	{
		1521	struct ev_io io;
		1522	struct ev_timer to;
		1523	void (*cb)(int revents, void *arg);
		1524	void *arg;
		1525	};
		1526
		1527	static void
		1528	once_cb (EV_P_ struct ev_once *once, int revents)
		1529	{
		1530	void (*cb)(int revents, void *arg) = once->cb;
		1531	void *arg = once->arg;
		1532
		1533	ev_io_stop (EV_A_ &once->io);
		1534	ev_timer_stop (EV_A_ &once->to);
		1535	ev_free (once);
		1536
		1537	cb (revents, arg);
		1538	}
		1539
		1540	static void
		1541	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1542	{
		1543	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1544	}
		1545
		1546	static void
		1547	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1548	{
		1549	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1550	}
		1551
		1552	void
		1553	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1554	{
		1555	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1556
		1557	if (!once)
		1558	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1559	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	}	1560	{
		1561	once->cb = cb;
		1562	once->arg = arg;
417		1563
418	ev_stop ((struct ev_watcher *)w);	1564	ev_watcher_init (&once->io, once_cb_io);
419	}	1565	if (fd >= 0)
		1566	{
		1567	ev_io_set (&once->io, fd, events);
		1568	ev_io_start (EV_A_ &once->io);
		1569	}
420		1570
421	void	1571	ev_watcher_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1572	if (timeout >= 0.)
423	{	1573	{
424	if (ev_is_active (w))	1574	ev_timer_set (&once->to, timeout, 0.);
425	return;	1575	ev_timer_start (EV_A_ &once->to);
426		1576	}
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	{	1577	}
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	}	1578	}
484		1579
485	#endif
486
487
488
489

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