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Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.69 by root, Tue Nov 6 00:10:04 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
		116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	119	#endif
17	#define HAVE_SELECT 1	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)(void);
		159
		160	void ev_set_syserr_cb (void (*cb)(void))
		161	{
		162	syserr_cb = cb;
		163	}
		164
		165	static void
		166	syserr (void)
		167	{
		168	if (syserr_cb)
		169	syserr_cb ();
		170	else
		171	{
		172	perror ("libev");
		173	abort ();
		174	}
		175	}
		176
		177	static void *(*alloc)(void *ptr, long size);
		178
		179	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		180	{
		181	alloc = cb;
		182	}
		183
		184	static void *
		185	ev_realloc (void *ptr, long size)
		186	{
		187	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		188
		189	if (!ptr && size)
		190	{
		191	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		192	abort ();
		193	}
		194
		195	return ptr;
		196	}
		197
		198	#define ev_malloc(size) ev_realloc (0, (size))
		199	#define ev_free(ptr) ev_realloc ((ptr), 0)
		200
		201	/*****************************************************************************/
		202
		203	typedef struct
		204	{
		205	WL head;
		206	unsigned char events;
		207	unsigned char reify;
		208	} ANFD;
		209
		210	typedef struct
		211	{
		212	W w;
		213	int events;
		214	} ANPENDING;
		215
		216	#if EV_MULTIPLICITY
		217
		218	struct ev_loop
		219	{
		220	# define VAR(name,decl) decl;
		221	# include "ev_vars.h"
26	};	222	};
		223	# undef VAR
		224	# include "ev_wrap.h"
27		225
28	struct ev_watcher_list {	226	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		227
32	static ev_tstamp now, diff; /* monotonic clock */	228	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	229	# include "ev_vars.h"
34	int ev_method;	230	# undef VAR
35		231
36	static int have_monotonic; /* runtime */	232	#endif
37		233
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	234	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		235
42	ev_tstamp	236	inline ev_tstamp
43	ev_time (void)	237	ev_time (void)
44	{	238	{
45	#if HAVE_REALTIME	239	#if EV_USE_REALTIME
46	struct timespec ts;	240	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	241	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	242	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	243	#else
50	struct timeval tv;	244	struct timeval tv;
51	gettimeofday (&tv, 0);	245	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	246	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	247	#endif
54	}	248	}
55		249
56	static ev_tstamp	250	inline ev_tstamp
57	get_clock (void)	251	get_clock (void)
58	{	252	{
59	#if HAVE_MONOTONIC	253	#if EV_USE_MONOTONIC
60	if (have_monotonic)	254	if (expect_true (have_monotonic))
61	{	255	{
62	struct timespec ts;	256	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	257	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	258	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	259	}
66	#endif	260	#endif
67		261
68	return ev_time ();	262	return ev_time ();
69	}	263	}
70		264
		265	ev_tstamp
		266	ev_now (EV_P)
		267	{
		268	return rt_now;
		269	}
		270
		271	#define array_roundsize(base,n) ((n) | 4 & ~3)
		272
71	#define array_needsize(base,cur,cnt,init) \	273	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	274	if (expect_false ((cnt) > cur)) \
73	{ \	275	{ \
74	int newcnt = cur ? cur << 1 : 16; \	276	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	277	do \
		278	{ \
		279	newcnt = array_roundsize (base, newcnt << 1); \
		280	} \
		281	while ((cnt) > newcnt); \
		282	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	283	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	284	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	285	cur = newcnt; \
79	}	286	}
80		287
81	typedef struct	288	#define array_slim(stem) \
82	{	289	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	290	{ \
84	unsigned char wev, rev; /* want, received event set */	291	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	292	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		293	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		294	}
86		295
87	static ANFD *anfds;	296	#define array_free(stem, idx) \
88	static int anfdmax;	297	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		298
90	static int *fdchanges;	299	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		300
93	static void	301	static void
94	anfds_init (ANFD *base, int count)	302	anfds_init (ANFD *base, int count)
95	{	303	{
96	while (count--)	304	while (count--)
97	{	305	{
98	base->head = 0;	306	base->head = 0;
99	base->wev = base->rev = EV_NONE;	307	base->events = EV_NONE;
		308	base->reify = 0;
		309
100	++base;	310	++base;
101	}	311	}
102	}	312	}
103		313
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	314	static void
114	event (struct ev_watcher *w, int events)	315	event (EV_P_ W w, int events)
115	{	316	{
		317	if (w->pending)
		318	{
		319	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		320	return;
		321	}
		322
116	w->pending = ++pendingcnt;	323	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	324	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	325	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	326	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	327	}
121		328
122	static void	329	static void
		330	queue_events (EV_P_ W *events, int eventcnt, int type)
		331	{
		332	int i;
		333
		334	for (i = 0; i < eventcnt; ++i)
		335	event (EV_A_ events [i], type);
		336	}
		337
		338	static void
123	fd_event (int fd, int events)	339	fd_event (EV_P_ int fd, int events)
124	{	340	{
125	ANFD *anfd = anfds + fd;	341	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	342	struct ev_io *w;
127		343
128	for (w = anfd->head; w; w = w->next)	344	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	345	{
130	int ev = w->events & events;	346	int ev = w->events & events;
131		347
132	if (ev)	348	if (ev)
133	event ((struct ev_watcher *)w, ev);	349	event (EV_A_ (W)w, ev);
134	}
135	}
136
137	static struct ev_timer **atimers;
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{	350	}
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	351	}
159		352
160	static void	353	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		354
165	while (k < (N >> 1))
166	{
167	int j = k << 1;
168
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	++j;
171
172	if (w->at <= timers [j]->at)
173	break;
174
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}
183
184	static struct ev_signal **signals;
185	static int signalmax;
186
187	static void	355	static void
188	signals_init (struct ev_signal **base, int count)	356	fd_reify (EV_P)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL
195	# include "ev_epoll.c"
196	#endif
197	#if HAVE_SELECT
198	# include "ev_select.c"
199	#endif
200
201	int ev_init (int flags)
202	{
203	#if HAVE_MONOTONIC
204	{
205	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;
208	}
209	#endif
210
211	ev_now = ev_time ();
212	now = get_clock ();
213	diff = ev_now - now;
214
215	#if HAVE_EPOLL
216	if (epoll_init (flags))
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();
241	#endif
242	}
243
244	static void
245	fd_reify (void)
246	{	357	{
247	int i;	358	int i;
248		359
249	for (i = 0; i < fdchangecnt; ++i)	360	for (i = 0; i < fdchangecnt; ++i)
250	{	361	{
251	int fd = fdchanges [i];	362	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	363	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	364	struct ev_io *w;
254		365
255	int wev = 0;	366	int events = 0;
256		367
257	for (w = anfd->head; w; w = w->next)	368	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	369	events |= w->events;
259		370
260	if (anfd->wev != wev)	371	anfd->reify = 0;
		372
		373	method_modify (EV_A_ fd, anfd->events, events);
		374	anfd->events = events;
		375	}
		376
		377	fdchangecnt = 0;
		378	}
		379
		380	static void
		381	fd_change (EV_P_ int fd)
		382	{
		383	if (anfds [fd].reify || fdchangecnt < 0)
		384	return;
		385
		386	anfds [fd].reify = 1;
		387
		388	++fdchangecnt;
		389	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		390	fdchanges [fdchangecnt - 1] = fd;
		391	}
		392
		393	static void
		394	fd_kill (EV_P_ int fd)
		395	{
		396	struct ev_io *w;
		397
		398	while ((w = (struct ev_io *)anfds [fd].head))
		399	{
		400	ev_io_stop (EV_A_ w);
		401	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		402	}
		403	}
		404
		405	/* called on EBADF to verify fds */
		406	static void
		407	fd_ebadf (EV_P)
		408	{
		409	int fd;
		410
		411	for (fd = 0; fd < anfdmax; ++fd)
		412	if (anfds [fd].events)
		413	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		414	fd_kill (EV_A_ fd);
		415	}
		416
		417	/* called on ENOMEM in select/poll to kill some fds and retry */
		418	static void
		419	fd_enomem (EV_P)
		420	{
		421	int fd;
		422
		423	for (fd = anfdmax; fd--; )
		424	if (anfds [fd].events)
		425	{
		426	fd_kill (EV_A_ fd);
		427	return;
		428	}
		429	}
		430
		431	/* susually called after fork if method needs to re-arm all fds from scratch */
		432	static void
		433	fd_rearm_all (EV_P)
		434	{
		435	int fd;
		436
		437	/* this should be highly optimised to not do anything but set a flag */
		438	for (fd = 0; fd < anfdmax; ++fd)
		439	if (anfds [fd].events)
		440	{
		441	anfds [fd].events = 0;
		442	fd_change (EV_A_ fd);
		443	}
		444	}
		445
		446	/*****************************************************************************/
		447
		448	static void
		449	upheap (WT *heap, int k)
		450	{
		451	WT w = heap [k];
		452
		453	while (k && heap [k >> 1]->at > w->at)
		454	{
		455	heap [k] = heap [k >> 1];
		456	((W)heap [k])->active = k + 1;
		457	k >>= 1;
		458	}
		459
		460	heap [k] = w;
		461	((W)heap [k])->active = k + 1;
		462
		463	}
		464
		465	static void
		466	downheap (WT *heap, int N, int k)
		467	{
		468	WT w = heap [k];
		469
		470	while (k < (N >> 1))
		471	{
		472	int j = k << 1;
		473
		474	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		475	++j;
		476
		477	if (w->at <= heap [j]->at)
		478	break;
		479
		480	heap [k] = heap [j];
		481	((W)heap [k])->active = k + 1;
		482	k = j;
		483	}
		484
		485	heap [k] = w;
		486	((W)heap [k])->active = k + 1;
		487	}
		488
		489	/*****************************************************************************/
		490
		491	typedef struct
		492	{
		493	WL head;
		494	sig_atomic_t volatile gotsig;
		495	} ANSIG;
		496
		497	static ANSIG *signals;
		498	static int signalmax;
		499
		500	static int sigpipe [2];
		501	static sig_atomic_t volatile gotsig;
		502	static struct ev_io sigev;
		503
		504	static void
		505	signals_init (ANSIG *base, int count)
		506	{
		507	while (count--)
		508	{
		509	base->head = 0;
		510	base->gotsig = 0;
		511
		512	++base;
		513	}
		514	}
		515
		516	static void
		517	sighandler (int signum)
		518	{
		519	#if WIN32
		520	signal (signum, sighandler);
		521	#endif
		522
		523	signals [signum - 1].gotsig = 1;
		524
		525	if (!gotsig)
		526	{
		527	int old_errno = errno;
		528	gotsig = 1;
		529	write (sigpipe [1], &signum, 1);
		530	errno = old_errno;
		531	}
		532	}
		533
		534	static void
		535	sigcb (EV_P_ struct ev_io *iow, int revents)
		536	{
		537	WL w;
		538	int signum;
		539
		540	read (sigpipe [0], &revents, 1);
		541	gotsig = 0;
		542
		543	for (signum = signalmax; signum--; )
		544	if (signals [signum].gotsig)
		545	{
		546	signals [signum].gotsig = 0;
		547
		548	for (w = signals [signum].head; w; w = w->next)
		549	event (EV_A_ (W)w, EV_SIGNAL);
		550	}
		551	}
		552
		553	static void
		554	siginit (EV_P)
		555	{
		556	#ifndef WIN32
		557	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		558	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		559
		560	/* rather than sort out wether we really need nb, set it */
		561	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		562	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		563	#endif
		564
		565	ev_io_set (&sigev, sigpipe [0], EV_READ);
		566	ev_io_start (EV_A_ &sigev);
		567	ev_unref (EV_A); /* child watcher should not keep loop alive */
		568	}
		569
		570	/*****************************************************************************/
		571
		572	#ifndef WIN32
		573
		574	static struct ev_child *childs [PID_HASHSIZE];
		575	static struct ev_signal childev;
		576
		577	#ifndef WCONTINUED
		578	# define WCONTINUED 0
		579	#endif
		580
		581	static void
		582	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		583	{
		584	struct ev_child *w;
		585
		586	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		587	if (w->pid == pid || !w->pid)
		588	{
		589	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		590	w->rpid = pid;
		591	w->rstatus = status;
		592	event (EV_A_ (W)w, EV_CHILD);
		593	}
		594	}
		595
		596	static void
		597	childcb (EV_P_ struct ev_signal *sw, int revents)
		598	{
		599	int pid, status;
		600
		601	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		602	{
		603	/* make sure we are called again until all childs have been reaped */
		604	event (EV_A_ (W)sw, EV_SIGNAL);
		605
		606	child_reap (EV_A_ sw, pid, pid, status);
		607	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		608	}
		609	}
		610
		611	#endif
		612
		613	/*****************************************************************************/
		614
		615	#if EV_USE_KQUEUE
		616	# include "ev_kqueue.c"
		617	#endif
		618	#if EV_USE_EPOLL
		619	# include "ev_epoll.c"
		620	#endif
		621	#if EV_USE_POLL
		622	# include "ev_poll.c"
		623	#endif
		624	#if EV_USE_SELECT
		625	# include "ev_select.c"
		626	#endif
		627
		628	int
		629	ev_version_major (void)
		630	{
		631	return EV_VERSION_MAJOR;
		632	}
		633
		634	int
		635	ev_version_minor (void)
		636	{
		637	return EV_VERSION_MINOR;
		638	}
		639
		640	/* return true if we are running with elevated privileges and should ignore env variables */
		641	static int
		642	enable_secure (void)
		643	{
		644	#ifdef WIN32
		645	return 0;
		646	#else
		647	return getuid () != geteuid ()
		648	|| getgid () != getegid ();
		649	#endif
		650	}
		651
		652	int
		653	ev_method (EV_P)
		654	{
		655	return method;
		656	}
		657
		658	static void
		659	loop_init (EV_P_ int methods)
		660	{
		661	if (!method)
		662	{
		663	#if EV_USE_MONOTONIC
		664	{
		665	struct timespec ts;
		666	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		667	have_monotonic = 1;
		668	}
		669	#endif
		670
		671	rt_now = ev_time ();
		672	mn_now = get_clock ();
		673	now_floor = mn_now;
		674	rtmn_diff = rt_now - mn_now;
		675
		676	if (methods == EVMETHOD_AUTO)
		677	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		678	methods = atoi (getenv ("LIBEV_METHODS"));
		679	else
		680	methods = EVMETHOD_ANY;
		681
		682	method = 0;
		683	#if EV_USE_WIN32
		684	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		685	#endif
		686	#if EV_USE_KQUEUE
		687	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		688	#endif
		689	#if EV_USE_EPOLL
		690	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		691	#endif
		692	#if EV_USE_POLL
		693	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		694	#endif
		695	#if EV_USE_SELECT
		696	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		697	#endif
		698	}
		699	}
		700
		701	void
		702	loop_destroy (EV_P)
		703	{
		704	int i;
		705
		706	#if EV_USE_WIN32
		707	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		708	#endif
		709	#if EV_USE_KQUEUE
		710	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		711	#endif
		712	#if EV_USE_EPOLL
		713	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		714	#endif
		715	#if EV_USE_POLL
		716	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		717	#endif
		718	#if EV_USE_SELECT
		719	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		720	#endif
		721
		722	for (i = NUMPRI; i--; )
		723	array_free (pending, [i]);
		724
		725	array_free (fdchange, );
		726	array_free (timer, );
		727	array_free (periodic, );
		728	array_free (idle, );
		729	array_free (prepare, );
		730	array_free (check, );
		731
		732	method = 0;
		733	/*TODO*/
		734	}
		735
		736	void
		737	loop_fork (EV_P)
		738	{
		739	/*TODO*/
		740	#if EV_USE_EPOLL
		741	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		742	#endif
		743	#if EV_USE_KQUEUE
		744	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		745	#endif
		746	}
		747
		748	#if EV_MULTIPLICITY
		749	struct ev_loop *
		750	ev_loop_new (int methods)
		751	{
		752	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		753
		754	memset (loop, 0, sizeof (struct ev_loop));
		755
		756	loop_init (EV_A_ methods);
		757
		758	if (ev_method (EV_A))
		759	return loop;
		760
		761	return 0;
		762	}
		763
		764	void
		765	ev_loop_destroy (EV_P)
		766	{
		767	loop_destroy (EV_A);
		768	ev_free (loop);
		769	}
		770
		771	void
		772	ev_loop_fork (EV_P)
		773	{
		774	loop_fork (EV_A);
		775	}
		776
		777	#endif
		778
		779	#if EV_MULTIPLICITY
		780	struct ev_loop default_loop_struct;
		781	static struct ev_loop *default_loop;
		782
		783	struct ev_loop *
		784	#else
		785	static int default_loop;
		786
		787	int
		788	#endif
		789	ev_default_loop (int methods)
		790	{
		791	if (sigpipe [0] == sigpipe [1])
		792	if (pipe (sigpipe))
		793	return 0;
		794
		795	if (!default_loop)
		796	{
		797	#if EV_MULTIPLICITY
		798	struct ev_loop *loop = default_loop = &default_loop_struct;
		799	#else
		800	default_loop = 1;
		801	#endif
		802
		803	loop_init (EV_A_ methods);
		804
		805	if (ev_method (EV_A))
261	{	806	{
262	method_modify (fd, anfd->wev, wev);	807	ev_watcher_init (&sigev, sigcb);
263	anfd->wev = wev;	808	ev_set_priority (&sigev, EV_MAXPRI);
		809	siginit (EV_A);
		810
		811	#ifndef WIN32
		812	ev_signal_init (&childev, childcb, SIGCHLD);
		813	ev_set_priority (&childev, EV_MAXPRI);
		814	ev_signal_start (EV_A_ &childev);
		815	ev_unref (EV_A); /* child watcher should not keep loop alive */
		816	#endif
264	}	817	}
		818	else
		819	default_loop = 0;
265	}	820	}
266		821
267	fdchangecnt = 0;	822	return default_loop;
268	}	823	}
269		824
		825	void
		826	ev_default_destroy (void)
		827	{
		828	#if EV_MULTIPLICITY
		829	struct ev_loop *loop = default_loop;
		830	#endif
		831
		832	ev_ref (EV_A); /* child watcher */
		833	ev_signal_stop (EV_A_ &childev);
		834
		835	ev_ref (EV_A); /* signal watcher */
		836	ev_io_stop (EV_A_ &sigev);
		837
		838	close (sigpipe [0]); sigpipe [0] = 0;
		839	close (sigpipe [1]); sigpipe [1] = 0;
		840
		841	loop_destroy (EV_A);
		842	}
		843
		844	void
		845	ev_default_fork (void)
		846	{
		847	#if EV_MULTIPLICITY
		848	struct ev_loop *loop = default_loop;
		849	#endif
		850
		851	loop_fork (EV_A);
		852
		853	ev_io_stop (EV_A_ &sigev);
		854	close (sigpipe [0]);
		855	close (sigpipe [1]);
		856	pipe (sigpipe);
		857
		858	ev_ref (EV_A); /* signal watcher */
		859	siginit (EV_A);
		860	}
		861
		862	/*****************************************************************************/
		863
270	static void	864	static void
271	call_pending ()	865	call_pending (EV_P)
272	{	866	{
273	int i;	867	int pri;
274		868
275	for (i = 0; i < pendingcnt; ++i)	869	for (pri = NUMPRI; pri--; )
		870	while (pendingcnt [pri])
276	{	871	{
277	ANPENDING *p = pendings + i;	872	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		873
279	if (p->w)	874	if (p->w)
280	{	875	{
281	p->w->pending = 0;	876	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	877	p->w->cb (EV_A_ p->w, p->events);
283	}	878	}
284	}	879	}
285
286	pendingcnt = 0;
287	}	880	}
288		881
289	static void	882	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	883	timers_reify (EV_P)
291	{	884	{
292	while (timercnt && timers [0]->at <= now)	885	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	886	{
294	struct ev_timer *w = timers [0];	887	struct ev_timer *w = timers [0];
		888
		889	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		890
296	/* first reschedule or stop timer */	891	/* first reschedule or stop timer */
297	if (w->repeat)	892	if (w->repeat)
298	{	893	{
299	if (w->is_abs)	894	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	895	((WT)w)->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	896	downheap ((WT *)timers, timercnt, 0);
307	}	897	}
308	else	898	else
		899	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		900
		901	event (EV_A_ (W)w, EV_TIMEOUT);
		902	}
		903	}
		904
		905	static void
		906	periodics_reify (EV_P)
		907	{
		908	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		909	{
		910	struct ev_periodic *w = periodics [0];
		911
		912	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		913
		914	/* first reschedule or stop timer */
		915	if (w->interval)
309	{	916	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	917	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	918	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		919	downheap ((WT *)periodics, periodiccnt, 0);
312	}	920	}
		921	else
		922	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		923
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	924	event (EV_A_ (W)w, EV_PERIODIC);
315	}	925	}
316	}	926	}
317		927
318	static void	928	static void
319	time_update ()	929	periodics_reschedule (EV_P)
320	{	930	{
321	int i;	931	int i;
322	ev_now = ev_time ();
323		932
324	if (have_monotonic)	933	/* adjust periodics after time jump */
		934	for (i = 0; i < periodiccnt; ++i)
325	{	935	{
326	ev_tstamp odiff = diff;	936	struct ev_periodic *w = periodics [i];
327		937
328	/* detecting time jumps is much more difficult */	938	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	939	{
331	now = get_clock ();	940	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		941
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	942	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	943	{
		944	ev_periodic_stop (EV_A_ w);
		945	ev_periodic_start (EV_A_ w);
336		946
337	ev_now = ev_time ();	947	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		948	}
338	}	949	}
		950	}
		951	}
339		952
340	/* time jump detected, reschedule atimers */	953	inline int
341	for (i = 0; i < atimercnt; ++i)	954	time_update_monotonic (EV_P)
		955	{
		956	mn_now = get_clock ();
		957
		958	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		959	{
		960	rt_now = rtmn_diff + mn_now;
		961	return 0;
		962	}
		963	else
		964	{
		965	now_floor = mn_now;
		966	rt_now = ev_time ();
		967	return 1;
		968	}
		969	}
		970
		971	static void
		972	time_update (EV_P)
		973	{
		974	int i;
		975
		976	#if EV_USE_MONOTONIC
		977	if (expect_true (have_monotonic))
		978	{
		979	if (time_update_monotonic (EV_A))
342	{	980	{
343	struct ev_timer *w = atimers [i];	981	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	982
		983	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		984	{
		985	rtmn_diff = rt_now - mn_now;
		986
		987	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		988	return; /* all is well */
		989
		990	rt_now = ev_time ();
		991	mn_now = get_clock ();
		992	now_floor = mn_now;
		993	}
		994
		995	periodics_reschedule (EV_A);
		996	/* no timer adjustment, as the monotonic clock doesn't jump */
		997	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	998	}
346	}	999	}
347	else	1000	else
		1001	#endif
348	{	1002	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1003	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	1004
		1005	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1006	{
		1007	periodics_reschedule (EV_A);
		1008
		1009	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	1010	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	1011	((WT)timers [i])->at += rt_now - mn_now;
		1012	}
353		1013
354	now = ev_now;	1014	mn_now = rt_now;
355	}	1015	}
356	}	1016	}
357		1017
358	int ev_loop_done;	1018	void
		1019	ev_ref (EV_P)
		1020	{
		1021	++activecnt;
		1022	}
359		1023
		1024	void
		1025	ev_unref (EV_P)
		1026	{
		1027	--activecnt;
		1028	}
		1029
		1030	static int loop_done;
		1031
		1032	void
360	void ev_loop (int flags)	1033	ev_loop (EV_P_ int flags)
361	{	1034	{
362	double block;	1035	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1036	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1037
365	do	1038	do
366	{	1039	{
		1040	/* queue check watchers (and execute them) */
		1041	if (expect_false (preparecnt))
		1042	{
		1043	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1044	call_pending (EV_A);
		1045	}
		1046
367	/* update fd-related kernel structures */	1047	/* update fd-related kernel structures */
368	fd_reify ();	1048	fd_reify (EV_A);
369		1049
370	/* calculate blocking time */	1050	/* calculate blocking time */
		1051
		1052	/* we only need this for !monotonic clockor timers, but as we basically
		1053	always have timers, we just calculate it always */
		1054	#if EV_USE_MONOTONIC
		1055	if (expect_true (have_monotonic))
		1056	time_update_monotonic (EV_A);
		1057	else
		1058	#endif
		1059	{
		1060	rt_now = ev_time ();
		1061	mn_now = rt_now;
		1062	}
		1063
371	if (flags & EVLOOP_NONBLOCK)	1064	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1065	block = 0.;
373	else	1066	else
374	{	1067	{
375	block = MAX_BLOCKTIME;	1068	block = MAX_BLOCKTIME;
376		1069
377	if (rtimercnt)	1070	if (timercnt)
378	{	1071	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1072	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1073	if (block > to) block = to;
381	}	1074	}
382		1075
383	if (atimercnt)	1076	if (periodiccnt)
384	{	1077	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1078	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
386	if (block > to) block = to;	1079	if (block > to) block = to;
387	}	1080	}
388		1081
389	if (block < 0.) block = 0.;	1082	if (block < 0.) block = 0.;
390	}	1083	}
391		1084
392	method_poll (block);	1085	method_poll (EV_A_ block);
393		1086
394	/* update ev_now, do magic */	1087	/* update rt_now, do magic */
395	time_update ();	1088	time_update (EV_A);
396		1089
397	/* put pending timers into pendign queue and reschedule them */	1090	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1091	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1092	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1093
		1094	/* queue idle watchers unless io or timers are pending */
		1095	if (!pendingcnt)
		1096	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1097
		1098	/* queue check watchers, to be executed first */
		1099	if (checkcnt)
		1100	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1101
403	call_pending ();	1102	call_pending (EV_A);
404	}	1103	}
405	while (!ev_loop_done);	1104	while (activecnt && !loop_done);
406	}
407		1105
408	static void	1106	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1107	loop_done = 0;
		1108	}
		1109
		1110	void
		1111	ev_unloop (EV_P_ int how)
		1112	{
		1113	loop_done = how;
		1114	}
		1115
		1116	/*****************************************************************************/
		1117
		1118	inline void
		1119	wlist_add (WL *head, WL elem)
410	{	1120	{
411	elem->next = *head;	1121	elem->next = *head;
412	*head = elem;	1122	*head = elem;
413	}	1123	}
414		1124
415	static void	1125	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1126	wlist_del (WL *head, WL elem)
417	{	1127	{
418	while (*head)	1128	while (*head)
419	{	1129	{
420	if (*head == elem)	1130	if (*head == elem)
421	{	1131	{
…		…
425		1135
426	head = &(*head)->next;	1136	head = &(*head)->next;
427	}	1137	}
428	}	1138	}
429		1139
430	static void	1140	inline void
431	ev_start (struct ev_watcher *w, int active)	1141	ev_clear_pending (EV_P_ W w)
432	{	1142	{
		1143	if (w->pending)
		1144	{
		1145	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1146	w->pending = 0;
		1147	}
		1148	}
		1149
		1150	inline void
		1151	ev_start (EV_P_ W w, int active)
		1152	{
		1153	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1154	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1155
434	w->active = active;	1156	w->active = active;
		1157	ev_ref (EV_A);
435	}	1158	}
436		1159
437	static void	1160	inline void
438	ev_stop (struct ev_watcher *w)	1161	ev_stop (EV_P_ W w)
439	{	1162	{
440	if (w->pending)	1163	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1164	w->active = 0;
444	/* nop */
445	}	1165	}
446		1166
		1167	/*****************************************************************************/
		1168
447	void	1169	void
448	evio_start (struct ev_io *w)	1170	ev_io_start (EV_P_ struct ev_io *w)
449	{	1171	{
		1172	int fd = w->fd;
		1173
450	if (ev_is_active (w))	1174	if (ev_is_active (w))
451	return;	1175	return;
452		1176
453	int fd = w->fd;	1177	assert (("ev_io_start called with negative fd", fd >= 0));
454		1178
455	ev_start ((struct ev_watcher *)w, 1);	1179	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1180	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1181	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1182
459	++fdchangecnt;	1183	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1184	}
463		1185
464	void	1186	void
465	evio_stop (struct ev_io *w)	1187	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1188	{
		1189	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1190	if (!ev_is_active (w))
468	return;	1191	return;
469		1192
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1193	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1194	ev_stop (EV_A_ (W)w);
472		1195
473	++fdchangecnt;	1196	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1197	}
477		1198
478	void	1199	void
479	evtimer_start (struct ev_timer *w)	1200	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1201	{
481	if (ev_is_active (w))	1202	if (ev_is_active (w))
482	return;	1203	return;
483		1204
484	if (w->is_abs)	1205	((WT)w)->at += mn_now;
		1206
		1207	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1208
		1209	ev_start (EV_A_ (W)w, ++timercnt);
		1210	array_needsize (timers, timermax, timercnt, );
		1211	timers [timercnt - 1] = w;
		1212	upheap ((WT *)timers, timercnt - 1);
		1213
		1214	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1215	}
		1216
		1217	void
		1218	ev_timer_stop (EV_P_ struct ev_timer *w)
		1219	{
		1220	ev_clear_pending (EV_A_ (W)w);
		1221	if (!ev_is_active (w))
		1222	return;
		1223
		1224	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1225
		1226	if (((W)w)->active < timercnt--)
		1227	{
		1228	timers [((W)w)->active - 1] = timers [timercnt];
		1229	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1230	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1231
		1232	((WT)w)->at = w->repeat;
		1233
		1234	ev_stop (EV_A_ (W)w);
		1235	}
		1236
		1237	void
		1238	ev_timer_again (EV_P_ struct ev_timer *w)
		1239	{
		1240	if (ev_is_active (w))
		1241	{
487	if (w->repeat)	1242	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1243	{
		1244	((WT)w)->at = mn_now + w->repeat;
		1245	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1246	}
		1247	else
		1248	ev_timer_stop (EV_A_ w);
		1249	}
		1250	else if (w->repeat)
		1251	ev_timer_start (EV_A_ w);
		1252	}
489		1253
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1254	void
491	array_needsize (atimers, atimermax, atimercnt, );	1255	ev_periodic_start (EV_P_ struct ev_periodic *w)
492	atimers [atimercnt - 1] = w;	1256	{
493	upheap (atimers, atimercnt - 1);	1257	if (ev_is_active (w))
		1258	return;
		1259
		1260	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1261
		1262	/* this formula differs from the one in periodic_reify because we do not always round up */
		1263	if (w->interval)
		1264	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1265
		1266	ev_start (EV_A_ (W)w, ++periodiccnt);
		1267	array_needsize (periodics, periodicmax, periodiccnt, );
		1268	periodics [periodiccnt - 1] = w;
		1269	upheap ((WT *)periodics, periodiccnt - 1);
		1270
		1271	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1272	}
		1273
		1274	void
		1275	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1276	{
		1277	ev_clear_pending (EV_A_ (W)w);
		1278	if (!ev_is_active (w))
		1279	return;
		1280
		1281	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1282
		1283	if (((W)w)->active < periodiccnt--)
494	}	1284	{
		1285	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1286	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1287	}
		1288
		1289	ev_stop (EV_A_ (W)w);
		1290	}
		1291
		1292	void
		1293	ev_idle_start (EV_P_ struct ev_idle *w)
		1294	{
		1295	if (ev_is_active (w))
		1296	return;
		1297
		1298	ev_start (EV_A_ (W)w, ++idlecnt);
		1299	array_needsize (idles, idlemax, idlecnt, );
		1300	idles [idlecnt - 1] = w;
		1301	}
		1302
		1303	void
		1304	ev_idle_stop (EV_P_ struct ev_idle *w)
		1305	{
		1306	ev_clear_pending (EV_A_ (W)w);
		1307	if (ev_is_active (w))
		1308	return;
		1309
		1310	idles [((W)w)->active - 1] = idles [--idlecnt];
		1311	ev_stop (EV_A_ (W)w);
		1312	}
		1313
		1314	void
		1315	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1316	{
		1317	if (ev_is_active (w))
		1318	return;
		1319
		1320	ev_start (EV_A_ (W)w, ++preparecnt);
		1321	array_needsize (prepares, preparemax, preparecnt, );
		1322	prepares [preparecnt - 1] = w;
		1323	}
		1324
		1325	void
		1326	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1327	{
		1328	ev_clear_pending (EV_A_ (W)w);
		1329	if (ev_is_active (w))
		1330	return;
		1331
		1332	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1333	ev_stop (EV_A_ (W)w);
		1334	}
		1335
		1336	void
		1337	ev_check_start (EV_P_ struct ev_check *w)
		1338	{
		1339	if (ev_is_active (w))
		1340	return;
		1341
		1342	ev_start (EV_A_ (W)w, ++checkcnt);
		1343	array_needsize (checks, checkmax, checkcnt, );
		1344	checks [checkcnt - 1] = w;
		1345	}
		1346
		1347	void
		1348	ev_check_stop (EV_P_ struct ev_check *w)
		1349	{
		1350	ev_clear_pending (EV_A_ (W)w);
		1351	if (ev_is_active (w))
		1352	return;
		1353
		1354	checks [((W)w)->active - 1] = checks [--checkcnt];
		1355	ev_stop (EV_A_ (W)w);
		1356	}
		1357
		1358	#ifndef SA_RESTART
		1359	# define SA_RESTART 0
		1360	#endif
		1361
		1362	void
		1363	ev_signal_start (EV_P_ struct ev_signal *w)
		1364	{
		1365	#if EV_MULTIPLICITY
		1366	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1367	#endif
		1368	if (ev_is_active (w))
		1369	return;
		1370
		1371	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1372
		1373	ev_start (EV_A_ (W)w, 1);
		1374	array_needsize (signals, signalmax, w->signum, signals_init);
		1375	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1376
		1377	if (!((WL)w)->next)
		1378	{
		1379	#if WIN32
		1380	signal (w->signum, sighandler);
		1381	#else
		1382	struct sigaction sa;
		1383	sa.sa_handler = sighandler;
		1384	sigfillset (&sa.sa_mask);
		1385	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1386	sigaction (w->signum, &sa, 0);
		1387	#endif
		1388	}
		1389	}
		1390
		1391	void
		1392	ev_signal_stop (EV_P_ struct ev_signal *w)
		1393	{
		1394	ev_clear_pending (EV_A_ (W)w);
		1395	if (!ev_is_active (w))
		1396	return;
		1397
		1398	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1399	ev_stop (EV_A_ (W)w);
		1400
		1401	if (!signals [w->signum - 1].head)
		1402	signal (w->signum, SIG_DFL);
		1403	}
		1404
		1405	void
		1406	ev_child_start (EV_P_ struct ev_child *w)
		1407	{
		1408	#if EV_MULTIPLICITY
		1409	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1410	#endif
		1411	if (ev_is_active (w))
		1412	return;
		1413
		1414	ev_start (EV_A_ (W)w, 1);
		1415	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1416	}
		1417
		1418	void
		1419	ev_child_stop (EV_P_ struct ev_child *w)
		1420	{
		1421	ev_clear_pending (EV_A_ (W)w);
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1426	ev_stop (EV_A_ (W)w);
		1427	}
		1428
		1429	/*****************************************************************************/
		1430
		1431	struct ev_once
		1432	{
		1433	struct ev_io io;
		1434	struct ev_timer to;
		1435	void (*cb)(int revents, void *arg);
		1436	void *arg;
		1437	};
		1438
		1439	static void
		1440	once_cb (EV_P_ struct ev_once *once, int revents)
		1441	{
		1442	void (*cb)(int revents, void *arg) = once->cb;
		1443	void *arg = once->arg;
		1444
		1445	ev_io_stop (EV_A_ &once->io);
		1446	ev_timer_stop (EV_A_ &once->to);
		1447	ev_free (once);
		1448
		1449	cb (revents, arg);
		1450	}
		1451
		1452	static void
		1453	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1454	{
		1455	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1456	}
		1457
		1458	static void
		1459	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1460	{
		1461	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1462	}
		1463
		1464	void
		1465	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1466	{
		1467	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
		1468
		1469	if (!once)
		1470	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1471	else
496	{	1472	{
497	w->at += now;	1473	once->cb = cb;
		1474	once->arg = arg;
498		1475
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1476	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1477	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	1478	{
517	atimers [w->active - 1] = atimers [atimercnt];	1479	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1480	ev_io_start (EV_A_ &once->io);
519	}	1481	}
520	}	1482
521	else	1483	ev_watcher_init (&once->to, once_cb_to);
522	{	1484	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1485	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1486	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1487	ev_timer_start (EV_A_ &once->to);
527	}	1488	}
528	}	1489	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1490	}
532		1491
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/
555	#if 1
556
557	static void
558	sin_cb (struct ev_io *w, int revents)
559	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561	}
562
563	static void
564	ocb (struct ev_timer *w, int revents)
565	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}
570
571	int main (void)
572	{
573	struct ev_io sin;
574
575	ev_init (0);
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}
594	#endif
595
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;
604	}
605
606	#endif
607
608
609
610

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