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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.59 by root, Sun Nov 4 18:15:16 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	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
		37	#include <unistd.h>
		38	#include <fcntl.h>
		39	#include <signal.h>
		40	#include <stddef.h>
3		41
4	#include <stdio.h>	42	#include <stdio.h>
5		43
6	#include <assert.h>	44	#include <assert.h>
7	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
8	#include <sys/time.h>	50	#include <sys/time.h>
9	#include <time.h>	51	#include <time.h>
10		52
		53	/**/
		54
		55	#ifndef EV_USE_MONOTONIC
		56	# define EV_USE_MONOTONIC 1
		57	#endif
		58
		59	#ifndef EV_USE_SELECT
		60	# define EV_USE_SELECT 1
		61	#endif
		62
		63	#ifndef EV_USE_POLL
		64	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		65	#endif
		66
		67	#ifndef EV_USE_EPOLL
		68	# define EV_USE_EPOLL 0
		69	#endif
		70
		71	#ifndef EV_USE_KQUEUE
		72	# define EV_USE_KQUEUE 0
		73	#endif
		74
		75	#ifndef EV_USE_REALTIME
		76	# define EV_USE_REALTIME 1
		77	#endif
		78
		79	/**/
		80
11	#ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
13	#endif	84	#endif
14		85
15	#define HAVE_EPOLL 1	86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 1	89	#endif
		90
		91	/**/
18		92
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	94	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		95	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		96	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		97
22	#include "ev.h"	98	#include "ev.h"
23		99
		100	#if __GNUC__ >= 3
		101	# define expect(expr,value) __builtin_expect ((expr),(value))
		102	# define inline inline
		103	#else
		104	# define expect(expr,value) (expr)
		105	# define inline static
		106	#endif
		107
		108	#define expect_false(expr) expect ((expr) != 0, 0)
		109	#define expect_true(expr) expect ((expr) != 0, 1)
		110
		111	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		112	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		113
24	struct ev_watcher {	114	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	115	typedef struct ev_watcher_list *WL;
		116	typedef struct ev_watcher_time *WT;
		117
		118	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		119
		120	/*****************************************************************************/
		121
		122	typedef struct
		123	{
		124	struct ev_watcher_list *head;
		125	unsigned char events;
		126	unsigned char reify;
		127	} ANFD;
		128
		129	typedef struct
		130	{
		131	W w;
		132	int events;
		133	} ANPENDING;
		134
		135	#if EV_MULTIPLICITY
		136
		137	struct ev_loop
		138	{
		139	# define VAR(name,decl) decl;
		140	# include "ev_vars.h"
26	};	141	};
		142	# undef VAR
		143	# include "ev_wrap.h"
27		144
28	struct ev_watcher_list {	145	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		146
32	static ev_tstamp now, diff; /* monotonic clock */	147	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	148	# include "ev_vars.h"
34	int ev_method;	149	# undef VAR
35		150
36	static int have_monotonic; /* runtime */	151	#endif
37		152
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	153	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		154
42	ev_tstamp	155	inline ev_tstamp
43	ev_time (void)	156	ev_time (void)
44	{	157	{
45	#if HAVE_REALTIME	158	#if EV_USE_REALTIME
46	struct timespec ts;	159	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	160	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	161	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	162	#else
50	struct timeval tv;	163	struct timeval tv;
51	gettimeofday (&tv, 0);	164	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	165	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	166	#endif
54	}	167	}
55		168
56	static ev_tstamp	169	inline ev_tstamp
57	get_clock (void)	170	get_clock (void)
58	{	171	{
59	#if HAVE_MONOTONIC	172	#if EV_USE_MONOTONIC
60	if (have_monotonic)	173	if (expect_true (have_monotonic))
61	{	174	{
62	struct timespec ts;	175	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	176	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	177	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	178	}
66	#endif	179	#endif
67		180
68	return ev_time ();	181	return ev_time ();
69	}	182	}
70		183
		184	ev_tstamp
		185	ev_now (EV_P)
		186	{
		187	return rt_now;
		188	}
		189
		190	#define array_roundsize(base,n) ((n) | 4 & ~3)
		191
71	#define array_needsize(base,cur,cnt,init) \	192	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	193	if (expect_false ((cnt) > cur)) \
73	{ \	194	{ \
74	int newcnt = cur ? cur << 1 : 16; \	195	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	196	do \
		197	{ \
		198	newcnt = array_roundsize (base, newcnt << 1); \
		199	} \
		200	while ((cnt) > newcnt); \
		201	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	202	base = realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	203	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	204	cur = newcnt; \
79	}	205	}
80		206
81	typedef struct	207	/*****************************************************************************/
82	{
83	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86
87	static ANFD *anfds;
88	static int anfdmax;
89
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92		208
93	static void	209	static void
94	anfds_init (ANFD *base, int count)	210	anfds_init (ANFD *base, int count)
95	{	211	{
96	while (count--)	212	while (count--)
97	{	213	{
98	base->head = 0;	214	base->head = 0;
99	base->wev = base->rev = EV_NONE;	215	base->events = EV_NONE;
		216	base->reify = 0;
		217
100	++base;	218	++base;
101	}	219	}
102	}	220	}
103		221
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	222	static void
114	event (struct ev_watcher *w, int events)	223	event (EV_P_ W w, int events)
115	{	224	{
		225	if (w->pending)
		226	{
		227	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		228	return;
		229	}
		230
116	w->pending = ++pendingcnt;	231	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	232	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	233	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	234	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	235	}
121		236
122	static void	237	static void
		238	queue_events (EV_P_ W *events, int eventcnt, int type)
		239	{
		240	int i;
		241
		242	for (i = 0; i < eventcnt; ++i)
		243	event (EV_A_ events [i], type);
		244	}
		245
		246	static void
123	fd_event (int fd, int events)	247	fd_event (EV_P_ int fd, int events)
124	{	248	{
125	ANFD *anfd = anfds + fd;	249	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	250	struct ev_io *w;
127		251
128	for (w = anfd->head; w; w = w->next)	252	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	253	{
130	int ev = w->events & events;	254	int ev = w->events & events;
131		255
132	if (ev)	256	if (ev)
133	event ((struct ev_watcher *)w, ev);	257	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	{	258	}
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	}	259	}
159		260
160	static void	261	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		262
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	263	static void
188	signals_init (struct ev_signal **base, int count)	264	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	{	265	{
247	int i;	266	int i;
248		267
249	for (i = 0; i < fdchangecnt; ++i)	268	for (i = 0; i < fdchangecnt; ++i)
250	{	269	{
251	int fd = fdchanges [i];	270	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	271	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	272	struct ev_io *w;
254		273
255	int wev = 0;	274	int events = 0;
256		275
257	for (w = anfd->head; w; w = w->next)	276	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	277	events |= w->events;
259		278
		279	anfd->reify = 0;
		280
260	if (anfd->wev != wev)	281	if (anfd->events != events)
261	{	282	{
262	method_modify (fd, anfd->wev, wev);	283	method_modify (EV_A_ fd, anfd->events, events);
263	anfd->wev = wev;	284	anfd->events = events;
264	}	285	}
265	}	286	}
266		287
267	fdchangecnt = 0;	288	fdchangecnt = 0;
268	}	289	}
269		290
270	static void	291	static void
271	call_pending ()	292	fd_change (EV_P_ int fd)
272	{	293	{
		294	if (anfds [fd].reify || fdchangecnt < 0)
		295	return;
		296
		297	anfds [fd].reify = 1;
		298
		299	++fdchangecnt;
		300	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		301	fdchanges [fdchangecnt - 1] = fd;
		302	}
		303
		304	static void
		305	fd_kill (EV_P_ int fd)
		306	{
		307	struct ev_io *w;
		308
		309	while ((w = (struct ev_io *)anfds [fd].head))
		310	{
		311	ev_io_stop (EV_A_ w);
		312	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		313	}
		314	}
		315
		316	/* called on EBADF to verify fds */
		317	static void
		318	fd_ebadf (EV_P)
		319	{
273	int i;	320	int fd;
274		321
275	for (i = 0; i < pendingcnt; ++i)	322	for (fd = 0; fd < anfdmax; ++fd)
		323	if (anfds [fd].events)
		324	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		325	fd_kill (EV_A_ fd);
		326	}
		327
		328	/* called on ENOMEM in select/poll to kill some fds and retry */
		329	static void
		330	fd_enomem (EV_P)
		331	{
		332	int fd = anfdmax;
		333
		334	while (fd--)
		335	if (anfds [fd].events)
276	{	336	{
277	ANPENDING *p = pendings + i;	337	close (fd);
		338	fd_kill (EV_A_ fd);
		339	return;
		340	}
		341	}
278		342
279	if (p->w)	343	/* susually called after fork if method needs to re-arm all fds from scratch */
		344	static void
		345	fd_rearm_all (EV_P)
		346	{
		347	int fd;
		348
		349	/* this should be highly optimised to not do anything but set a flag */
		350	for (fd = 0; fd < anfdmax; ++fd)
		351	if (anfds [fd].events)
		352	{
		353	anfds [fd].events = 0;
		354	fd_change (fd);
		355	}
		356	}
		357
		358	/*****************************************************************************/
		359
		360	static void
		361	upheap (WT *heap, int k)
		362	{
		363	WT w = heap [k];
		364
		365	while (k && heap [k >> 1]->at > w->at)
		366	{
		367	heap [k] = heap [k >> 1];
		368	heap [k]->active = k + 1;
		369	k >>= 1;
		370	}
		371
		372	heap [k] = w;
		373	heap [k]->active = k + 1;
		374
		375	}
		376
		377	static void
		378	downheap (WT *heap, int N, int k)
		379	{
		380	WT w = heap [k];
		381
		382	while (k < (N >> 1))
		383	{
		384	int j = k << 1;
		385
		386	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		387	++j;
		388
		389	if (w->at <= heap [j]->at)
		390	break;
		391
		392	heap [k] = heap [j];
		393	heap [k]->active = k + 1;
		394	k = j;
		395	}
		396
		397	heap [k] = w;
		398	heap [k]->active = k + 1;
		399	}
		400
		401	/*****************************************************************************/
		402
		403	typedef struct
		404	{
		405	struct ev_watcher_list *head;
		406	sig_atomic_t volatile gotsig;
		407	} ANSIG;
		408
		409	static ANSIG *signals;
		410	static int signalmax;
		411
		412	static int sigpipe [2];
		413	static sig_atomic_t volatile gotsig;
		414	static struct ev_io sigev;
		415
		416	static void
		417	signals_init (ANSIG *base, int count)
		418	{
		419	while (count--)
		420	{
		421	base->head = 0;
		422	base->gotsig = 0;
		423
		424	++base;
		425	}
		426	}
		427
		428	static void
		429	sighandler (int signum)
		430	{
		431	signals [signum - 1].gotsig = 1;
		432
		433	if (!gotsig)
		434	{
		435	int old_errno = errno;
		436	gotsig = 1;
		437	write (sigpipe [1], &signum, 1);
		438	errno = old_errno;
		439	}
		440	}
		441
		442	static void
		443	sigcb (EV_P_ struct ev_io *iow, int revents)
		444	{
		445	struct ev_watcher_list *w;
		446	int signum;
		447
		448	read (sigpipe [0], &revents, 1);
		449	gotsig = 0;
		450
		451	for (signum = signalmax; signum--; )
		452	if (signals [signum].gotsig)
		453	{
		454	signals [signum].gotsig = 0;
		455
		456	for (w = signals [signum].head; w; w = w->next)
		457	event (EV_A_ (W)w, EV_SIGNAL);
		458	}
		459	}
		460
		461	static void
		462	siginit (EV_P)
		463	{
		464	#ifndef WIN32
		465	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		466	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		467
		468	/* rather than sort out wether we really need nb, set it */
		469	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		470	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		471	#endif
		472
		473	ev_io_set (&sigev, sigpipe [0], EV_READ);
		474	ev_io_start (EV_A_ &sigev);
		475	ev_unref (EV_A); /* child watcher should not keep loop alive */
		476	}
		477
		478	/*****************************************************************************/
		479
		480	#ifndef WIN32
		481
		482	static struct ev_child *childs [PID_HASHSIZE];
		483	static struct ev_signal childev;
		484
		485	#ifndef WCONTINUED
		486	# define WCONTINUED 0
		487	#endif
		488
		489	static void
		490	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		491	{
		492	struct ev_child *w;
		493
		494	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		495	if (w->pid == pid || !w->pid)
		496	{
		497	w->priority = sw->priority; /* need to do it *now* */
		498	w->rpid = pid;
		499	w->rstatus = status;
		500	event (EV_A_ (W)w, EV_CHILD);
		501	}
		502	}
		503
		504	static void
		505	childcb (EV_P_ struct ev_signal *sw, int revents)
		506	{
		507	int pid, status;
		508
		509	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		510	{
		511	/* make sure we are called again until all childs have been reaped */
		512	event (EV_A_ (W)sw, EV_SIGNAL);
		513
		514	child_reap (EV_A_ sw, pid, pid, status);
		515	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		516	}
		517	}
		518
		519	#endif
		520
		521	/*****************************************************************************/
		522
		523	#if EV_USE_KQUEUE
		524	# include "ev_kqueue.c"
		525	#endif
		526	#if EV_USE_EPOLL
		527	# include "ev_epoll.c"
		528	#endif
		529	#if EV_USE_POLL
		530	# include "ev_poll.c"
		531	#endif
		532	#if EV_USE_SELECT
		533	# include "ev_select.c"
		534	#endif
		535
		536	int
		537	ev_version_major (void)
		538	{
		539	return EV_VERSION_MAJOR;
		540	}
		541
		542	int
		543	ev_version_minor (void)
		544	{
		545	return EV_VERSION_MINOR;
		546	}
		547
		548	/* return true if we are running with elevated privileges and should ignore env variables */
		549	static int
		550	enable_secure (void)
		551	{
		552	#ifdef WIN32
		553	return 0;
		554	#else
		555	return getuid () != geteuid ()
		556	|| getgid () != getegid ();
		557	#endif
		558	}
		559
		560	int
		561	ev_method (EV_P)
		562	{
		563	return method;
		564	}
		565
		566	static void
		567	loop_init (EV_P_ int methods)
		568	{
		569	if (!method)
		570	{
		571	#if EV_USE_MONOTONIC
		572	{
		573	struct timespec ts;
		574	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		575	have_monotonic = 1;
		576	}
		577	#endif
		578
		579	rt_now = ev_time ();
		580	mn_now = get_clock ();
		581	now_floor = mn_now;
		582	rtmn_diff = rt_now - mn_now;
		583
		584	if (methods == EVMETHOD_AUTO)
		585	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		586	methods = atoi (getenv ("LIBEV_METHODS"));
		587	else
		588	methods = EVMETHOD_ANY;
		589
		590	method = 0;
		591	#if EV_USE_KQUEUE
		592	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		593	#endif
		594	#if EV_USE_EPOLL
		595	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		596	#endif
		597	#if EV_USE_POLL
		598	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		599	#endif
		600	#if EV_USE_SELECT
		601	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		602	#endif
		603	}
		604	}
		605
		606	void
		607	loop_destroy (EV_P)
		608	{
		609	#if EV_USE_KQUEUE
		610	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		611	#endif
		612	#if EV_USE_EPOLL
		613	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		614	#endif
		615	#if EV_USE_POLL
		616	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		617	#endif
		618	#if EV_USE_SELECT
		619	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		620	#endif
		621
		622	method = 0;
		623	/*TODO*/
		624	}
		625
		626	void
		627	loop_fork (EV_P)
		628	{
		629	/*TODO*/
		630	#if EV_USE_EPOLL
		631	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		632	#endif
		633	#if EV_USE_KQUEUE
		634	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		635	#endif
		636	}
		637
		638	#if EV_MULTIPLICITY
		639	struct ev_loop *
		640	ev_loop_new (int methods)
		641	{
		642	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		643
		644	loop_init (EV_A_ methods);
		645
		646	if (ev_methods (EV_A))
		647	return loop;
		648
		649	return 0;
		650	}
		651
		652	void
		653	ev_loop_destroy (EV_P)
		654	{
		655	loop_destroy (EV_A);
		656	free (loop);
		657	}
		658
		659	void
		660	ev_loop_fork (EV_P)
		661	{
		662	loop_fork (EV_A);
		663	}
		664
		665	#endif
		666
		667	#if EV_MULTIPLICITY
		668	struct ev_loop default_loop_struct;
		669	static struct ev_loop *default_loop;
		670
		671	struct ev_loop *
		672	#else
		673	static int default_loop;
		674
		675	int
		676	#endif
		677	ev_default_loop (int methods)
		678	{
		679	if (sigpipe [0] == sigpipe [1])
		680	if (pipe (sigpipe))
		681	return 0;
		682
		683	if (!default_loop)
		684	{
		685	#if EV_MULTIPLICITY
		686	struct ev_loop *loop = default_loop = &default_loop_struct;
		687	#else
		688	default_loop = 1;
		689	#endif
		690
		691	loop_init (EV_A_ methods);
		692
		693	if (ev_method (EV_A))
280	{	694	{
281	p->w->pending = 0;	695	ev_watcher_init (&sigev, sigcb);
282	p->w->cb (p->w, p->events);	696	ev_set_priority (&sigev, EV_MAXPRI);
		697	siginit (EV_A);
		698
		699	#ifndef WIN32
		700	ev_signal_init (&childev, childcb, SIGCHLD);
		701	ev_set_priority (&childev, EV_MAXPRI);
		702	ev_signal_start (EV_A_ &childev);
		703	ev_unref (EV_A); /* child watcher should not keep loop alive */
		704	#endif
283	}	705	}
		706	else
		707	default_loop = 0;
		708	}
		709
		710	return default_loop;
		711	}
		712
		713	void
		714	ev_default_destroy (void)
		715	{
		716	#if EV_MULTIPLICITY
		717	struct ev_loop *loop = default_loop;
		718	#endif
		719
		720	ev_ref (EV_A); /* child watcher */
		721	ev_signal_stop (EV_A_ &childev);
		722
		723	ev_ref (EV_A); /* signal watcher */
		724	ev_io_stop (EV_A_ &sigev);
		725
		726	close (sigpipe [0]); sigpipe [0] = 0;
		727	close (sigpipe [1]); sigpipe [1] = 0;
		728
		729	loop_destroy (EV_A);
		730	}
		731
		732	void
		733	ev_default_fork (EV_P)
		734	{
		735	loop_fork (EV_A);
		736
		737	ev_io_stop (EV_A_ &sigev);
		738	close (sigpipe [0]);
		739	close (sigpipe [1]);
		740	pipe (sigpipe);
		741
		742	ev_ref (EV_A); /* signal watcher */
		743	siginit (EV_A);
		744	}
		745
		746	/*****************************************************************************/
		747
		748	static void
		749	call_pending (EV_P)
		750	{
		751	int pri;
		752
		753	for (pri = NUMPRI; pri--; )
		754	while (pendingcnt [pri])
		755	{
		756	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		757
		758	if (p->w)
		759	{
		760	p->w->pending = 0;
		761	p->w->cb (EV_A_ p->w, p->events);
		762	}
284	}	763	}
285
286	pendingcnt = 0;
287	}	764	}
288		765
289	static void	766	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	767	timers_reify (EV_P)
291	{	768	{
292	while (timercnt && timers [0]->at <= now)	769	while (timercnt && timers [0]->at <= mn_now)
293	{	770	{
294	struct ev_timer *w = timers [0];	771	struct ev_timer *w = timers [0];
295		772
296	/* first reschedule or stop timer */	773	/* first reschedule or stop timer */
297	if (w->repeat)	774	if (w->repeat)
298	{	775	{
299	if (w->is_abs)	776	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;	777	w->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	778	downheap ((WT *)timers, timercnt, 0);
307	}	779	}
308	else	780	else
		781	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		782
		783	event (EV_A_ (W)w, EV_TIMEOUT);
		784	}
		785	}
		786
		787	static void
		788	periodics_reify (EV_P)
		789	{
		790	while (periodiccnt && periodics [0]->at <= rt_now)
		791	{
		792	struct ev_periodic *w = periodics [0];
		793
		794	/* first reschedule or stop timer */
		795	if (w->interval)
309	{	796	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	797	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	798	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		799	downheap ((WT *)periodics, periodiccnt, 0);
312	}	800	}
		801	else
		802	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		803
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	804	event (EV_A_ (W)w, EV_PERIODIC);
315	}	805	}
316	}	806	}
317		807
318	static void	808	static void
319	time_update ()	809	periodics_reschedule (EV_P)
320	{	810	{
321	int i;	811	int i;
322	ev_now = ev_time ();
323		812
324	if (have_monotonic)	813	/* adjust periodics after time jump */
		814	for (i = 0; i < periodiccnt; ++i)
325	{	815	{
326	ev_tstamp odiff = diff;	816	struct ev_periodic *w = periodics [i];
327		817
328	/* detecting time jumps is much more difficult */	818	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	819	{
331	now = get_clock ();	820	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		821
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	822	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	823	{
		824	ev_periodic_stop (EV_A_ w);
		825	ev_periodic_start (EV_A_ w);
336		826
337	ev_now = ev_time ();	827	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		828	}
338	}	829	}
		830	}
		831	}
339		832
340	/* time jump detected, reschedule atimers */	833	inline int
341	for (i = 0; i < atimercnt; ++i)	834	time_update_monotonic (EV_P)
		835	{
		836	mn_now = get_clock ();
		837
		838	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		839	{
		840	rt_now = rtmn_diff + mn_now;
		841	return 0;
		842	}
		843	else
		844	{
		845	now_floor = mn_now;
		846	rt_now = ev_time ();
		847	return 1;
		848	}
		849	}
		850
		851	static void
		852	time_update (EV_P)
		853	{
		854	int i;
		855
		856	#if EV_USE_MONOTONIC
		857	if (expect_true (have_monotonic))
		858	{
		859	if (time_update_monotonic (EV_A))
342	{	860	{
343	struct ev_timer *w = atimers [i];	861	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	862
		863	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		864	{
		865	rtmn_diff = rt_now - mn_now;
		866
		867	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		868	return; /* all is well */
		869
		870	rt_now = ev_time ();
		871	mn_now = get_clock ();
		872	now_floor = mn_now;
		873	}
		874
		875	periodics_reschedule (EV_A);
		876	/* no timer adjustment, as the monotonic clock doesn't jump */
		877	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	878	}
346	}	879	}
347	else	880	else
		881	#endif
348	{	882	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	883	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	884
		885	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		886	{
		887	periodics_reschedule (EV_A);
		888
		889	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	890	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	891	timers [i]->at += rt_now - mn_now;
		892	}
353		893
354	now = ev_now;	894	mn_now = rt_now;
355	}	895	}
356	}	896	}
357		897
358	int ev_loop_done;	898	void
		899	ev_ref (EV_P)
		900	{
		901	++activecnt;
		902	}
359		903
		904	void
		905	ev_unref (EV_P)
		906	{
		907	--activecnt;
		908	}
		909
		910	static int loop_done;
		911
		912	void
360	void ev_loop (int flags)	913	ev_loop (EV_P_ int flags)
361	{	914	{
362	double block;	915	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	916	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		917
365	do	918	do
366	{	919	{
		920	/* queue check watchers (and execute them) */
		921	if (expect_false (preparecnt))
		922	{
		923	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		924	call_pending (EV_A);
		925	}
		926
367	/* update fd-related kernel structures */	927	/* update fd-related kernel structures */
368	fd_reify ();	928	fd_reify (EV_A);
369		929
370	/* calculate blocking time */	930	/* calculate blocking time */
		931
		932	/* we only need this for !monotonic clockor timers, but as we basically
		933	always have timers, we just calculate it always */
		934	#if EV_USE_MONOTONIC
		935	if (expect_true (have_monotonic))
		936	time_update_monotonic (EV_A);
		937	else
		938	#endif
		939	{
		940	rt_now = ev_time ();
		941	mn_now = rt_now;
		942	}
		943
371	if (flags & EVLOOP_NONBLOCK)	944	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	945	block = 0.;
373	else	946	else
374	{	947	{
375	block = MAX_BLOCKTIME;	948	block = MAX_BLOCKTIME;
376		949
377	if (rtimercnt)	950	if (timercnt)
378	{	951	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	952	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
380	if (block > to) block = to;	953	if (block > to) block = to;
381	}	954	}
382		955
383	if (atimercnt)	956	if (periodiccnt)
384	{	957	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	958	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
386	if (block > to) block = to;	959	if (block > to) block = to;
387	}	960	}
388		961
389	if (block < 0.) block = 0.;	962	if (block < 0.) block = 0.;
390	}	963	}
391		964
392	method_poll (block);	965	method_poll (EV_A_ block);
393		966
394	/* update ev_now, do magic */	967	/* update rt_now, do magic */
395	time_update ();	968	time_update (EV_A);
396		969
397	/* put pending timers into pendign queue and reschedule them */	970	/* queue pending timers and reschedule them */
398	/* absolute timers first */	971	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	972	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		973
		974	/* queue idle watchers unless io or timers are pending */
		975	if (!pendingcnt)
		976	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		977
		978	/* queue check watchers, to be executed first */
		979	if (checkcnt)
		980	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		981
403	call_pending ();	982	call_pending (EV_A);
404	}	983	}
405	while (!ev_loop_done);	984	while (activecnt && !loop_done);
406	}
407		985
408	static void	986	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	987	loop_done = 0;
		988	}
		989
		990	void
		991	ev_unloop (EV_P_ int how)
		992	{
		993	loop_done = how;
		994	}
		995
		996	/*****************************************************************************/
		997
		998	inline void
		999	wlist_add (WL *head, WL elem)
410	{	1000	{
411	elem->next = *head;	1001	elem->next = *head;
412	*head = elem;	1002	*head = elem;
413	}	1003	}
414		1004
415	static void	1005	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1006	wlist_del (WL *head, WL elem)
417	{	1007	{
418	while (*head)	1008	while (*head)
419	{	1009	{
420	if (*head == elem)	1010	if (*head == elem)
421	{	1011	{
…		…
425		1015
426	head = &(*head)->next;	1016	head = &(*head)->next;
427	}	1017	}
428	}	1018	}
429		1019
430	static void	1020	inline void
431	ev_start (struct ev_watcher *w, int active)	1021	ev_clear_pending (EV_P_ W w)
432	{	1022	{
		1023	if (w->pending)
		1024	{
		1025	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1026	w->pending = 0;
		1027	}
		1028	}
		1029
		1030	inline void
		1031	ev_start (EV_P_ W w, int active)
		1032	{
		1033	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1034	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1035
434	w->active = active;	1036	w->active = active;
		1037	ev_ref (EV_A);
435	}	1038	}
436		1039
437	static void	1040	inline void
438	ev_stop (struct ev_watcher *w)	1041	ev_stop (EV_P_ W w)
439	{	1042	{
440	if (w->pending)	1043	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1044	w->active = 0;
444	/* nop */
445	}	1045	}
446		1046
		1047	/*****************************************************************************/
		1048
447	void	1049	void
448	evio_start (struct ev_io *w)	1050	ev_io_start (EV_P_ struct ev_io *w)
449	{	1051	{
		1052	int fd = w->fd;
		1053
450	if (ev_is_active (w))	1054	if (ev_is_active (w))
451	return;	1055	return;
452		1056
453	int fd = w->fd;	1057	assert (("ev_io_start called with negative fd", fd >= 0));
454		1058
455	ev_start ((struct ev_watcher *)w, 1);	1059	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1060	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1061	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1062
459	++fdchangecnt;	1063	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1064	}
463		1065
464	void	1066	void
465	evio_stop (struct ev_io *w)	1067	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1068	{
		1069	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1070	if (!ev_is_active (w))
468	return;	1071	return;
469		1072
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1073	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1074	ev_stop (EV_A_ (W)w);
472		1075
473	++fdchangecnt;	1076	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1077	}
477		1078
478	void	1079	void
479	evtimer_start (struct ev_timer *w)	1080	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1081	{
481	if (ev_is_active (w))	1082	if (ev_is_active (w))
482	return;	1083	return;
483		1084
484	if (w->is_abs)	1085	w->at += mn_now;
		1086
		1087	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1088
		1089	ev_start (EV_A_ (W)w, ++timercnt);
		1090	array_needsize (timers, timermax, timercnt, );
		1091	timers [timercnt - 1] = w;
		1092	upheap ((WT *)timers, timercnt - 1);
		1093	}
		1094
		1095	void
		1096	ev_timer_stop (EV_P_ struct ev_timer *w)
		1097	{
		1098	ev_clear_pending (EV_A_ (W)w);
		1099	if (!ev_is_active (w))
		1100	return;
		1101
		1102	if (w->active < timercnt--)
		1103	{
		1104	timers [w->active - 1] = timers [timercnt];
		1105	downheap ((WT *)timers, timercnt, w->active - 1);
485	{	1106	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1107
		1108	w->at = w->repeat;
		1109
		1110	ev_stop (EV_A_ (W)w);
		1111	}
		1112
		1113	void
		1114	ev_timer_again (EV_P_ struct ev_timer *w)
		1115	{
		1116	if (ev_is_active (w))
		1117	{
487	if (w->repeat)	1118	if (w->repeat)
		1119	{
		1120	w->at = mn_now + w->repeat;
		1121	downheap ((WT *)timers, timercnt, w->active - 1);
		1122	}
		1123	else
		1124	ev_timer_stop (EV_A_ w);
		1125	}
		1126	else if (w->repeat)
		1127	ev_timer_start (EV_A_ w);
		1128	}
		1129
		1130	void
		1131	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1132	{
		1133	if (ev_is_active (w))
		1134	return;
		1135
		1136	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1137
		1138	/* this formula differs from the one in periodic_reify because we do not always round up */
		1139	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1140	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
489		1141
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1142	ev_start (EV_A_ (W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	1143	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	1144	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	1145	upheap ((WT *)periodics, periodiccnt - 1);
		1146	}
		1147
		1148	void
		1149	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1150	{
		1151	ev_clear_pending (EV_A_ (W)w);
		1152	if (!ev_is_active (w))
		1153	return;
		1154
		1155	if (w->active < periodiccnt--)
494	}	1156	{
		1157	periodics [w->active - 1] = periodics [periodiccnt];
		1158	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1159	}
		1160
		1161	ev_stop (EV_A_ (W)w);
		1162	}
		1163
		1164	void
		1165	ev_idle_start (EV_P_ struct ev_idle *w)
		1166	{
		1167	if (ev_is_active (w))
		1168	return;
		1169
		1170	ev_start (EV_A_ (W)w, ++idlecnt);
		1171	array_needsize (idles, idlemax, idlecnt, );
		1172	idles [idlecnt - 1] = w;
		1173	}
		1174
		1175	void
		1176	ev_idle_stop (EV_P_ struct ev_idle *w)
		1177	{
		1178	ev_clear_pending (EV_A_ (W)w);
		1179	if (ev_is_active (w))
		1180	return;
		1181
		1182	idles [w->active - 1] = idles [--idlecnt];
		1183	ev_stop (EV_A_ (W)w);
		1184	}
		1185
		1186	void
		1187	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1188	{
		1189	if (ev_is_active (w))
		1190	return;
		1191
		1192	ev_start (EV_A_ (W)w, ++preparecnt);
		1193	array_needsize (prepares, preparemax, preparecnt, );
		1194	prepares [preparecnt - 1] = w;
		1195	}
		1196
		1197	void
		1198	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1199	{
		1200	ev_clear_pending (EV_A_ (W)w);
		1201	if (ev_is_active (w))
		1202	return;
		1203
		1204	prepares [w->active - 1] = prepares [--preparecnt];
		1205	ev_stop (EV_A_ (W)w);
		1206	}
		1207
		1208	void
		1209	ev_check_start (EV_P_ struct ev_check *w)
		1210	{
		1211	if (ev_is_active (w))
		1212	return;
		1213
		1214	ev_start (EV_A_ (W)w, ++checkcnt);
		1215	array_needsize (checks, checkmax, checkcnt, );
		1216	checks [checkcnt - 1] = w;
		1217	}
		1218
		1219	void
		1220	ev_check_stop (EV_P_ struct ev_check *w)
		1221	{
		1222	ev_clear_pending (EV_A_ (W)w);
		1223	if (ev_is_active (w))
		1224	return;
		1225
		1226	checks [w->active - 1] = checks [--checkcnt];
		1227	ev_stop (EV_A_ (W)w);
		1228	}
		1229
		1230	#ifndef SA_RESTART
		1231	# define SA_RESTART 0
		1232	#endif
		1233
		1234	void
		1235	ev_signal_start (EV_P_ struct ev_signal *w)
		1236	{
		1237	#if EV_MULTIPLICITY
		1238	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1239	#endif
		1240	if (ev_is_active (w))
		1241	return;
		1242
		1243	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1244
		1245	ev_start (EV_A_ (W)w, 1);
		1246	array_needsize (signals, signalmax, w->signum, signals_init);
		1247	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1248
		1249	if (!w->next)
		1250	{
		1251	struct sigaction sa;
		1252	sa.sa_handler = sighandler;
		1253	sigfillset (&sa.sa_mask);
		1254	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1255	sigaction (w->signum, &sa, 0);
		1256	}
		1257	}
		1258
		1259	void
		1260	ev_signal_stop (EV_P_ struct ev_signal *w)
		1261	{
		1262	ev_clear_pending (EV_A_ (W)w);
		1263	if (!ev_is_active (w))
		1264	return;
		1265
		1266	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1267	ev_stop (EV_A_ (W)w);
		1268
		1269	if (!signals [w->signum - 1].head)
		1270	signal (w->signum, SIG_DFL);
		1271	}
		1272
		1273	void
		1274	ev_child_start (EV_P_ struct ev_child *w)
		1275	{
		1276	#if EV_MULTIPLICITY
		1277	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1278	#endif
		1279	if (ev_is_active (w))
		1280	return;
		1281
		1282	ev_start (EV_A_ (W)w, 1);
		1283	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1284	}
		1285
		1286	void
		1287	ev_child_stop (EV_P_ struct ev_child *w)
		1288	{
		1289	ev_clear_pending (EV_A_ (W)w);
		1290	if (ev_is_active (w))
		1291	return;
		1292
		1293	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1294	ev_stop (EV_A_ (W)w);
		1295	}
		1296
		1297	/*****************************************************************************/
		1298
		1299	struct ev_once
		1300	{
		1301	struct ev_io io;
		1302	struct ev_timer to;
		1303	void (*cb)(int revents, void *arg);
		1304	void *arg;
		1305	};
		1306
		1307	static void
		1308	once_cb (EV_P_ struct ev_once *once, int revents)
		1309	{
		1310	void (*cb)(int revents, void *arg) = once->cb;
		1311	void *arg = once->arg;
		1312
		1313	ev_io_stop (EV_A_ &once->io);
		1314	ev_timer_stop (EV_A_ &once->to);
		1315	free (once);
		1316
		1317	cb (revents, arg);
		1318	}
		1319
		1320	static void
		1321	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1322	{
		1323	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1324	}
		1325
		1326	static void
		1327	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1328	{
		1329	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1330	}
		1331
		1332	void
		1333	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1334	{
		1335	struct ev_once *once = malloc (sizeof (struct ev_once));
		1336
		1337	if (!once)
		1338	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1339	else
496	{	1340	{
497	w->at += now;	1341	once->cb = cb;
		1342	once->arg = arg;
498		1343
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1344	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1345	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	{	1346	{
517	atimers [w->active - 1] = atimers [atimercnt];	1347	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1348	ev_io_start (EV_A_ &once->io);
519	}	1349	}
520	}	1350
521	else	1351	ev_watcher_init (&once->to, once_cb_to);
522	{	1352	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1353	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1354	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1355	ev_timer_start (EV_A_ &once->to);
527	}	1356	}
528	}	1357	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1358	}
532		1359
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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