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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 1.58 by root, Sun Nov 4 16:52:52 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_EMBED
		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_USEV_POLL
		64	# define EV_USEV_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
		86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	89	#endif
17	#define HAVE_SELECT 1	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
		98	#ifndef EV_EMBED
22	#include "ev.h"	99	# include "ev.h"
		100	#endif
23		101
		102	#if __GNUC__ >= 3
		103	# define expect(expr,value) __builtin_expect ((expr),(value))
		104	# define inline inline
		105	#else
		106	# define expect(expr,value) (expr)
		107	# define inline static
		108	#endif
		109
		110	#define expect_false(expr) expect ((expr) != 0, 0)
		111	#define expect_true(expr) expect ((expr) != 0, 1)
		112
		113	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		114	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		115
24	struct ev_watcher {	116	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	117	typedef struct ev_watcher_list *WL;
		118	typedef struct ev_watcher_time *WT;
		119
		120	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		121
		122	/*****************************************************************************/
		123
		124	typedef struct
		125	{
		126	struct ev_watcher_list *head;
		127	unsigned char events;
		128	unsigned char reify;
		129	} ANFD;
		130
		131	typedef struct
		132	{
		133	W w;
		134	int events;
		135	} ANPENDING;
		136
		137	#if EV_MULTIPLICITY
		138
		139	struct ev_loop
		140	{
		141	# define VAR(name,decl) decl;
		142	# include "ev_vars.h"
26	};	143	};
		144	# undef VAR
		145	# include "ev_wrap.h"
27		146
28	struct ev_watcher_list {	147	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		148
32	static ev_tstamp now, diff; /* monotonic clock */	149	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	150	# include "ev_vars.h"
34	int ev_method;	151	# undef VAR
35		152
36	static int have_monotonic; /* runtime */	153	#endif
37		154
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	155	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		156
42	ev_tstamp	157	inline ev_tstamp
43	ev_time (void)	158	ev_time (void)
44	{	159	{
45	#if HAVE_REALTIME	160	#if EV_USE_REALTIME
46	struct timespec ts;	161	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	162	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	163	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	164	#else
50	struct timeval tv;	165	struct timeval tv;
51	gettimeofday (&tv, 0);	166	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	167	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	168	#endif
54	}	169	}
55		170
56	static ev_tstamp	171	inline ev_tstamp
57	get_clock (void)	172	get_clock (void)
58	{	173	{
59	#if HAVE_MONOTONIC	174	#if EV_USE_MONOTONIC
60	if (have_monotonic)	175	if (expect_true (have_monotonic))
61	{	176	{
62	struct timespec ts;	177	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	178	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	179	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	180	}
66	#endif	181	#endif
67		182
68	return ev_time ();	183	return ev_time ();
69	}	184	}
70		185
		186	ev_tstamp
		187	ev_now (EV_P)
		188	{
		189	return rt_now;
		190	}
		191
		192	#define array_roundsize(base,n) ((n) | 4 & ~3)
		193
71	#define array_needsize(base,cur,cnt,init) \	194	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	195	if (expect_false ((cnt) > cur)) \
73	{ \	196	{ \
74	int newcnt = cur ? cur << 1 : 16; \	197	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	198	do \
		199	{ \
		200	newcnt = array_roundsize (base, newcnt << 1); \
		201	} \
		202	while ((cnt) > newcnt); \
		203	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	204	base = realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	205	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	206	cur = newcnt; \
79	}	207	}
80		208
81	typedef struct	209	/*****************************************************************************/
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		210
93	static void	211	static void
94	anfds_init (ANFD *base, int count)	212	anfds_init (ANFD *base, int count)
95	{	213	{
96	while (count--)	214	while (count--)
97	{	215	{
98	base->head = 0;	216	base->head = 0;
99	base->wev = base->rev = EV_NONE;	217	base->events = EV_NONE;
		218	base->reify = 0;
		219
100	++base;	220	++base;
101	}	221	}
102	}	222	}
103		223
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	224	static void
114	event (struct ev_watcher *w, int events)	225	event (EV_P_ W w, int events)
115	{	226	{
		227	if (w->pending)
		228	{
		229	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		230	return;
		231	}
		232
116	w->pending = ++pendingcnt;	233	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	234	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	235	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	236	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	237	}
121		238
122	static void	239	static void
		240	queue_events (EV_P_ W *events, int eventcnt, int type)
		241	{
		242	int i;
		243
		244	for (i = 0; i < eventcnt; ++i)
		245	event (EV_A_ events [i], type);
		246	}
		247
		248	static void
123	fd_event (int fd, int events)	249	fd_event (EV_P_ int fd, int events)
124	{	250	{
125	ANFD *anfd = anfds + fd;	251	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	252	struct ev_io *w;
127		253
128	for (w = anfd->head; w; w = w->next)	254	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	255	{
130	int ev = w->events & events;	256	int ev = w->events & events;
131		257
132	if (ev)	258	if (ev)
133	event ((struct ev_watcher *)w, ev);	259	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	{	260	}
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	}	261	}
159		262
160	static void	263	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		264
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	265	static void
188	signals_init (struct ev_signal **base, int count)	266	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	{	267	{
247	int i;	268	int i;
248		269
249	for (i = 0; i < fdchangecnt; ++i)	270	for (i = 0; i < fdchangecnt; ++i)
250	{	271	{
251	int fd = fdchanges [i];	272	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	273	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	274	struct ev_io *w;
254		275
255	int wev = 0;	276	int events = 0;
256		277
257	for (w = anfd->head; w; w = w->next)	278	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	279	events |= w->events;
259		280
		281	anfd->reify = 0;
		282
260	if (anfd->wev != wev)	283	if (anfd->events != events)
261	{	284	{
262	method_modify (fd, anfd->wev, wev);	285	method_modify (EV_A_ fd, anfd->events, events);
263	anfd->wev = wev;	286	anfd->events = events;
264	}	287	}
265	}	288	}
266		289
267	fdchangecnt = 0;	290	fdchangecnt = 0;
268	}	291	}
269		292
270	static void	293	static void
271	call_pending ()	294	fd_change (EV_P_ int fd)
272	{	295	{
		296	if (anfds [fd].reify || fdchangecnt < 0)
		297	return;
		298
		299	anfds [fd].reify = 1;
		300
		301	++fdchangecnt;
		302	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		303	fdchanges [fdchangecnt - 1] = fd;
		304	}
		305
		306	static void
		307	fd_kill (EV_P_ int fd)
		308	{
		309	struct ev_io *w;
		310
		311	while ((w = (struct ev_io *)anfds [fd].head))
		312	{
		313	ev_io_stop (EV_A_ w);
		314	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		315	}
		316	}
		317
		318	/* called on EBADF to verify fds */
		319	static void
		320	fd_ebadf (EV_P)
		321	{
273	int i;	322	int fd;
274		323
275	for (i = 0; i < pendingcnt; ++i)	324	for (fd = 0; fd < anfdmax; ++fd)
		325	if (anfds [fd].events)
		326	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		327	fd_kill (EV_A_ fd);
		328	}
		329
		330	/* called on ENOMEM in select/poll to kill some fds and retry */
		331	static void
		332	fd_enomem (EV_P)
		333	{
		334	int fd = anfdmax;
		335
		336	while (fd--)
		337	if (anfds [fd].events)
276	{	338	{
277	ANPENDING *p = pendings + i;	339	close (fd);
		340	fd_kill (EV_A_ fd);
		341	return;
		342	}
		343	}
278		344
279	if (p->w)	345	/* susually called after fork if method needs to re-arm all fds from scratch */
		346	static void
		347	fd_rearm_all (EV_P)
		348	{
		349	int fd;
		350
		351	/* this should be highly optimised to not do anything but set a flag */
		352	for (fd = 0; fd < anfdmax; ++fd)
		353	if (anfds [fd].events)
		354	{
		355	anfds [fd].events = 0;
		356	fd_change (fd);
		357	}
		358	}
		359
		360	/*****************************************************************************/
		361
		362	static void
		363	upheap (WT *heap, int k)
		364	{
		365	WT w = heap [k];
		366
		367	while (k && heap [k >> 1]->at > w->at)
		368	{
		369	heap [k] = heap [k >> 1];
		370	heap [k]->active = k + 1;
		371	k >>= 1;
		372	}
		373
		374	heap [k] = w;
		375	heap [k]->active = k + 1;
		376
		377	}
		378
		379	static void
		380	downheap (WT *heap, int N, int k)
		381	{
		382	WT w = heap [k];
		383
		384	while (k < (N >> 1))
		385	{
		386	int j = k << 1;
		387
		388	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		389	++j;
		390
		391	if (w->at <= heap [j]->at)
		392	break;
		393
		394	heap [k] = heap [j];
		395	heap [k]->active = k + 1;
		396	k = j;
		397	}
		398
		399	heap [k] = w;
		400	heap [k]->active = k + 1;
		401	}
		402
		403	/*****************************************************************************/
		404
		405	typedef struct
		406	{
		407	struct ev_watcher_list *head;
		408	sig_atomic_t volatile gotsig;
		409	} ANSIG;
		410
		411	static ANSIG *signals;
		412	static int signalmax;
		413
		414	static int sigpipe [2];
		415	static sig_atomic_t volatile gotsig;
		416
		417	static void
		418	signals_init (ANSIG *base, int count)
		419	{
		420	while (count--)
		421	{
		422	base->head = 0;
		423	base->gotsig = 0;
		424
		425	++base;
		426	}
		427	}
		428
		429	static void
		430	sighandler (int signum)
		431	{
		432	signals [signum - 1].gotsig = 1;
		433
		434	if (!gotsig)
		435	{
		436	int old_errno = errno;
		437	gotsig = 1;
		438	write (sigpipe [1], &signum, 1);
		439	errno = old_errno;
		440	}
		441	}
		442
		443	static void
		444	sigcb (EV_P_ struct ev_io *iow, int revents)
		445	{
		446	struct ev_watcher_list *w;
		447	int signum;
		448
		449	read (sigpipe [0], &revents, 1);
		450	gotsig = 0;
		451
		452	for (signum = signalmax; signum--; )
		453	if (signals [signum].gotsig)
		454	{
		455	signals [signum].gotsig = 0;
		456
		457	for (w = signals [signum].head; w; w = w->next)
		458	event (EV_A_ (W)w, EV_SIGNAL);
		459	}
		460	}
		461
		462	static void
		463	siginit (EV_P)
		464	{
		465	#ifndef WIN32
		466	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		467	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		468
		469	/* rather than sort out wether we really need nb, set it */
		470	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		471	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		472	#endif
		473
		474	ev_io_set (&sigev, sigpipe [0], EV_READ);
		475	ev_io_start (EV_A_ &sigev);
		476	ev_unref (EV_A); /* child watcher should not keep loop alive */
		477	}
		478
		479	/*****************************************************************************/
		480
		481	#ifndef WIN32
		482
		483	#ifndef WCONTINUED
		484	# define WCONTINUED 0
		485	#endif
		486
		487	static void
		488	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		489	{
		490	struct ev_child *w;
		491
		492	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		493	if (w->pid == pid || !w->pid)
		494	{
		495	w->priority = sw->priority; /* need to do it *now* */
		496	w->rpid = pid;
		497	w->rstatus = status;
		498	event (EV_A_ (W)w, EV_CHILD);
		499	}
		500	}
		501
		502	static void
		503	childcb (EV_P_ struct ev_signal *sw, int revents)
		504	{
		505	int pid, status;
		506
		507	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		508	{
		509	/* make sure we are called again until all childs have been reaped */
		510	event (EV_A_ (W)sw, EV_SIGNAL);
		511
		512	child_reap (EV_A_ sw, pid, pid, status);
		513	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		514	}
		515	}
		516
		517	#endif
		518
		519	/*****************************************************************************/
		520
		521	#if EV_USE_KQUEUE
		522	# include "ev_kqueue.c"
		523	#endif
		524	#if EV_USE_EPOLL
		525	# include "ev_epoll.c"
		526	#endif
		527	#if EV_USEV_POLL
		528	# include "ev_poll.c"
		529	#endif
		530	#if EV_USE_SELECT
		531	# include "ev_select.c"
		532	#endif
		533
		534	int
		535	ev_version_major (void)
		536	{
		537	return EV_VERSION_MAJOR;
		538	}
		539
		540	int
		541	ev_version_minor (void)
		542	{
		543	return EV_VERSION_MINOR;
		544	}
		545
		546	/* return true if we are running with elevated privileges and should ignore env variables */
		547	static int
		548	enable_secure (void)
		549	{
		550	#ifdef WIN32
		551	return 0;
		552	#else
		553	return getuid () != geteuid ()
		554	|| getgid () != getegid ();
		555	#endif
		556	}
		557
		558	int
		559	ev_method (EV_P)
		560	{
		561	return method;
		562	}
		563
		564	static void
		565	loop_init (EV_P_ int methods)
		566	{
		567	if (!method)
		568	{
		569	#if EV_USE_MONOTONIC
		570	{
		571	struct timespec ts;
		572	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		573	have_monotonic = 1;
		574	}
		575	#endif
		576
		577	rt_now = ev_time ();
		578	mn_now = get_clock ();
		579	now_floor = mn_now;
		580	rtmn_diff = rt_now - mn_now;
		581
		582	if (methods == EVMETHOD_AUTO)
		583	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		584	methods = atoi (getenv ("LIBEV_METHODS"));
		585	else
		586	methods = EVMETHOD_ANY;
		587
		588	method = 0;
		589	#if EV_USE_KQUEUE
		590	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		591	#endif
		592	#if EV_USE_EPOLL
		593	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		594	#endif
		595	#if EV_USEV_POLL
		596	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		597	#endif
		598	#if EV_USE_SELECT
		599	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		600	#endif
		601	}
		602	}
		603
		604	void
		605	loop_destroy (EV_P)
		606	{
		607	#if EV_USE_KQUEUE
		608	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		609	#endif
		610	#if EV_USE_EPOLL
		611	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		612	#endif
		613	#if EV_USEV_POLL
		614	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		615	#endif
		616	#if EV_USE_SELECT
		617	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		618	#endif
		619
		620	method = 0;
		621	/*TODO*/
		622	}
		623
		624	void
		625	loop_fork (EV_P)
		626	{
		627	/*TODO*/
		628	#if EV_USE_EPOLL
		629	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		630	#endif
		631	#if EV_USE_KQUEUE
		632	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		633	#endif
		634	}
		635
		636	#if EV_MULTIPLICITY
		637	struct ev_loop *
		638	ev_loop_new (int methods)
		639	{
		640	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		641
		642	loop_init (EV_A_ methods);
		643
		644	if (ev_methods (EV_A))
		645	return loop;
		646
		647	return 0;
		648	}
		649
		650	void
		651	ev_loop_destroy (EV_P)
		652	{
		653	loop_destroy (EV_A);
		654	free (loop);
		655	}
		656
		657	void
		658	ev_loop_fork (EV_P)
		659	{
		660	loop_fork (EV_A);
		661	}
		662
		663	#endif
		664
		665	#if EV_MULTIPLICITY
		666	struct ev_loop default_loop_struct;
		667	static struct ev_loop *default_loop;
		668
		669	struct ev_loop *
		670	#else
		671	static int default_loop;
		672
		673	int
		674	#endif
		675	ev_default_loop (int methods)
		676	{
		677	if (sigpipe [0] == sigpipe [1])
		678	if (pipe (sigpipe))
		679	return 0;
		680
		681	if (!default_loop)
		682	{
		683	#if EV_MULTIPLICITY
		684	struct ev_loop *loop = default_loop = &default_loop_struct;
		685	#else
		686	default_loop = 1;
		687	#endif
		688
		689	loop_init (EV_A_ methods);
		690
		691	if (ev_method (EV_A))
280	{	692	{
281	p->w->pending = 0;	693	ev_watcher_init (&sigev, sigcb);
282	p->w->cb (p->w, p->events);	694	ev_set_priority (&sigev, EV_MAXPRI);
		695	siginit (EV_A);
		696
		697	#ifndef WIN32
		698	ev_signal_init (&childev, childcb, SIGCHLD);
		699	ev_set_priority (&childev, EV_MAXPRI);
		700	ev_signal_start (EV_A_ &childev);
		701	ev_unref (EV_A); /* child watcher should not keep loop alive */
		702	#endif
283	}	703	}
		704	else
		705	default_loop = 0;
		706	}
		707
		708	return default_loop;
		709	}
		710
		711	void
		712	ev_default_destroy (void)
		713	{
		714	#if EV_MULTIPLICITY
		715	struct ev_loop *loop = default_loop;
		716	#endif
		717
		718	ev_ref (EV_A); /* child watcher */
		719	ev_signal_stop (EV_A_ &childev);
		720
		721	ev_ref (EV_A); /* signal watcher */
		722	ev_io_stop (EV_A_ &sigev);
		723
		724	close (sigpipe [0]); sigpipe [0] = 0;
		725	close (sigpipe [1]); sigpipe [1] = 0;
		726
		727	loop_destroy (EV_A);
		728	}
		729
		730	void
		731	ev_default_fork (EV_P)
		732	{
		733	loop_fork (EV_A);
		734
		735	ev_io_stop (EV_A_ &sigev);
		736	close (sigpipe [0]);
		737	close (sigpipe [1]);
		738	pipe (sigpipe);
		739
		740	ev_ref (EV_A); /* signal watcher */
		741	siginit (EV_A);
		742	}
		743
		744	/*****************************************************************************/
		745
		746	static void
		747	call_pending (EV_P)
		748	{
		749	int pri;
		750
		751	for (pri = NUMPRI; pri--; )
		752	while (pendingcnt [pri])
		753	{
		754	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		755
		756	if (p->w)
		757	{
		758	p->w->pending = 0;
		759	p->w->cb (EV_A_ p->w, p->events);
		760	}
284	}	761	}
285
286	pendingcnt = 0;
287	}	762	}
288		763
289	static void	764	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	765	timers_reify (EV_P)
291	{	766	{
292	while (timercnt && timers [0]->at <= now)	767	while (timercnt && timers [0]->at <= mn_now)
293	{	768	{
294	struct ev_timer *w = timers [0];	769	struct ev_timer *w = timers [0];
295		770
296	/* first reschedule or stop timer */	771	/* first reschedule or stop timer */
297	if (w->repeat)	772	if (w->repeat)
298	{	773	{
299	if (w->is_abs)	774	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;	775	w->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	776	downheap ((WT *)timers, timercnt, 0);
307	}	777	}
308	else	778	else
		779	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		780
		781	event (EV_A_ (W)w, EV_TIMEOUT);
		782	}
		783	}
		784
		785	static void
		786	periodics_reify (EV_P)
		787	{
		788	while (periodiccnt && periodics [0]->at <= rt_now)
		789	{
		790	struct ev_periodic *w = periodics [0];
		791
		792	/* first reschedule or stop timer */
		793	if (w->interval)
309	{	794	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	795	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	796	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		797	downheap ((WT *)periodics, periodiccnt, 0);
312	}	798	}
		799	else
		800	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		801
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	802	event (EV_A_ (W)w, EV_PERIODIC);
315	}	803	}
316	}	804	}
317		805
318	static void	806	static void
319	time_update ()	807	periodics_reschedule (EV_P)
320	{	808	{
321	int i;	809	int i;
322	ev_now = ev_time ();
323		810
324	if (have_monotonic)	811	/* adjust periodics after time jump */
		812	for (i = 0; i < periodiccnt; ++i)
325	{	813	{
326	ev_tstamp odiff = diff;	814	struct ev_periodic *w = periodics [i];
327		815
328	/* detecting time jumps is much more difficult */	816	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	817	{
331	now = get_clock ();	818	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		819
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	820	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	821	{
		822	ev_periodic_stop (EV_A_ w);
		823	ev_periodic_start (EV_A_ w);
336		824
337	ev_now = ev_time ();	825	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		826	}
338	}	827	}
		828	}
		829	}
339		830
340	/* time jump detected, reschedule atimers */	831	inline int
341	for (i = 0; i < atimercnt; ++i)	832	time_update_monotonic (EV_P)
		833	{
		834	mn_now = get_clock ();
		835
		836	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		837	{
		838	rt_now = rtmn_diff + mn_now;
		839	return 0;
		840	}
		841	else
		842	{
		843	now_floor = mn_now;
		844	rt_now = ev_time ();
		845	return 1;
		846	}
		847	}
		848
		849	static void
		850	time_update (EV_P)
		851	{
		852	int i;
		853
		854	#if EV_USE_MONOTONIC
		855	if (expect_true (have_monotonic))
		856	{
		857	if (time_update_monotonic (EV_A))
342	{	858	{
343	struct ev_timer *w = atimers [i];	859	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	860
		861	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		862	{
		863	rtmn_diff = rt_now - mn_now;
		864
		865	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		866	return; /* all is well */
		867
		868	rt_now = ev_time ();
		869	mn_now = get_clock ();
		870	now_floor = mn_now;
		871	}
		872
		873	periodics_reschedule (EV_A);
		874	/* no timer adjustment, as the monotonic clock doesn't jump */
		875	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	876	}
346	}	877	}
347	else	878	else
		879	#endif
348	{	880	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	881	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	882
		883	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		884	{
		885	periodics_reschedule (EV_A);
		886
		887	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	888	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	889	timers [i]->at += rt_now - mn_now;
		890	}
353		891
354	now = ev_now;	892	mn_now = rt_now;
355	}	893	}
356	}	894	}
357		895
358	int ev_loop_done;	896	void
		897	ev_ref (EV_P)
		898	{
		899	++activecnt;
		900	}
359		901
		902	void
		903	ev_unref (EV_P)
		904	{
		905	--activecnt;
		906	}
		907
		908	static int loop_done;
		909
		910	void
360	void ev_loop (int flags)	911	ev_loop (EV_P_ int flags)
361	{	912	{
362	double block;	913	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	914	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		915
365	do	916	do
366	{	917	{
		918	/* queue check watchers (and execute them) */
		919	if (expect_false (preparecnt))
		920	{
		921	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		922	call_pending (EV_A);
		923	}
		924
367	/* update fd-related kernel structures */	925	/* update fd-related kernel structures */
368	fd_reify ();	926	fd_reify (EV_A);
369		927
370	/* calculate blocking time */	928	/* calculate blocking time */
		929
		930	/* we only need this for !monotonic clockor timers, but as we basically
		931	always have timers, we just calculate it always */
		932	#if EV_USE_MONOTONIC
		933	if (expect_true (have_monotonic))
		934	time_update_monotonic (EV_A);
		935	else
		936	#endif
		937	{
		938	rt_now = ev_time ();
		939	mn_now = rt_now;
		940	}
		941
371	if (flags & EVLOOP_NONBLOCK)	942	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	943	block = 0.;
373	else	944	else
374	{	945	{
375	block = MAX_BLOCKTIME;	946	block = MAX_BLOCKTIME;
376		947
377	if (rtimercnt)	948	if (timercnt)
378	{	949	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	950	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
380	if (block > to) block = to;	951	if (block > to) block = to;
381	}	952	}
382		953
383	if (atimercnt)	954	if (periodiccnt)
384	{	955	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	956	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
386	if (block > to) block = to;	957	if (block > to) block = to;
387	}	958	}
388		959
389	if (block < 0.) block = 0.;	960	if (block < 0.) block = 0.;
390	}	961	}
391		962
392	method_poll (block);	963	method_poll (EV_A_ block);
393		964
394	/* update ev_now, do magic */	965	/* update rt_now, do magic */
395	time_update ();	966	time_update (EV_A);
396		967
397	/* put pending timers into pendign queue and reschedule them */	968	/* queue pending timers and reschedule them */
398	/* absolute timers first */	969	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	970	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		971
		972	/* queue idle watchers unless io or timers are pending */
		973	if (!pendingcnt)
		974	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		975
		976	/* queue check watchers, to be executed first */
		977	if (checkcnt)
		978	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		979
403	call_pending ();	980	call_pending (EV_A);
404	}	981	}
405	while (!ev_loop_done);	982	while (activecnt && !loop_done);
406	}
407		983
408	static void	984	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	985	loop_done = 0;
		986	}
		987
		988	void
		989	ev_unloop (EV_P_ int how)
		990	{
		991	loop_done = how;
		992	}
		993
		994	/*****************************************************************************/
		995
		996	inline void
		997	wlist_add (WL *head, WL elem)
410	{	998	{
411	elem->next = *head;	999	elem->next = *head;
412	*head = elem;	1000	*head = elem;
413	}	1001	}
414		1002
415	static void	1003	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1004	wlist_del (WL *head, WL elem)
417	{	1005	{
418	while (*head)	1006	while (*head)
419	{	1007	{
420	if (*head == elem)	1008	if (*head == elem)
421	{	1009	{
…		…
425		1013
426	head = &(*head)->next;	1014	head = &(*head)->next;
427	}	1015	}
428	}	1016	}
429		1017
430	static void	1018	inline void
431	ev_start (struct ev_watcher *w, int active)	1019	ev_clear_pending (EV_P_ W w)
432	{	1020	{
		1021	if (w->pending)
		1022	{
		1023	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1024	w->pending = 0;
		1025	}
		1026	}
		1027
		1028	inline void
		1029	ev_start (EV_P_ W w, int active)
		1030	{
		1031	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1032	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1033
434	w->active = active;	1034	w->active = active;
		1035	ev_ref (EV_A);
435	}	1036	}
436		1037
437	static void	1038	inline void
438	ev_stop (struct ev_watcher *w)	1039	ev_stop (EV_P_ W w)
439	{	1040	{
440	if (w->pending)	1041	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1042	w->active = 0;
444	/* nop */
445	}	1043	}
446		1044
		1045	/*****************************************************************************/
		1046
447	void	1047	void
448	evio_start (struct ev_io *w)	1048	ev_io_start (EV_P_ struct ev_io *w)
449	{	1049	{
		1050	int fd = w->fd;
		1051
450	if (ev_is_active (w))	1052	if (ev_is_active (w))
451	return;	1053	return;
452		1054
453	int fd = w->fd;	1055	assert (("ev_io_start called with negative fd", fd >= 0));
454		1056
455	ev_start ((struct ev_watcher *)w, 1);	1057	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1058	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1059	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1060
459	++fdchangecnt;	1061	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1062	}
463		1063
464	void	1064	void
465	evio_stop (struct ev_io *w)	1065	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1066	{
		1067	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1068	if (!ev_is_active (w))
468	return;	1069	return;
469		1070
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1071	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1072	ev_stop (EV_A_ (W)w);
472		1073
473	++fdchangecnt;	1074	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1075	}
477		1076
478	void	1077	void
479	evtimer_start (struct ev_timer *w)	1078	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1079	{
481	if (ev_is_active (w))	1080	if (ev_is_active (w))
482	return;	1081	return;
483		1082
484	if (w->is_abs)	1083	w->at += mn_now;
		1084
		1085	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1086
		1087	ev_start (EV_A_ (W)w, ++timercnt);
		1088	array_needsize (timers, timermax, timercnt, );
		1089	timers [timercnt - 1] = w;
		1090	upheap ((WT *)timers, timercnt - 1);
		1091	}
		1092
		1093	void
		1094	ev_timer_stop (EV_P_ struct ev_timer *w)
		1095	{
		1096	ev_clear_pending (EV_A_ (W)w);
		1097	if (!ev_is_active (w))
		1098	return;
		1099
		1100	if (w->active < timercnt--)
		1101	{
		1102	timers [w->active - 1] = timers [timercnt];
		1103	downheap ((WT *)timers, timercnt, w->active - 1);
485	{	1104	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1105
		1106	w->at = w->repeat;
		1107
		1108	ev_stop (EV_A_ (W)w);
		1109	}
		1110
		1111	void
		1112	ev_timer_again (EV_P_ struct ev_timer *w)
		1113	{
		1114	if (ev_is_active (w))
		1115	{
487	if (w->repeat)	1116	if (w->repeat)
		1117	{
		1118	w->at = mn_now + w->repeat;
		1119	downheap ((WT *)timers, timercnt, w->active - 1);
		1120	}
		1121	else
		1122	ev_timer_stop (EV_A_ w);
		1123	}
		1124	else if (w->repeat)
		1125	ev_timer_start (EV_A_ w);
		1126	}
		1127
		1128	void
		1129	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1130	{
		1131	if (ev_is_active (w))
		1132	return;
		1133
		1134	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1135
		1136	/* this formula differs from the one in periodic_reify because we do not always round up */
		1137	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1138	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
489		1139
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1140	ev_start (EV_A_ (W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	1141	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	1142	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	1143	upheap ((WT *)periodics, periodiccnt - 1);
		1144	}
		1145
		1146	void
		1147	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1148	{
		1149	ev_clear_pending (EV_A_ (W)w);
		1150	if (!ev_is_active (w))
		1151	return;
		1152
		1153	if (w->active < periodiccnt--)
494	}	1154	{
		1155	periodics [w->active - 1] = periodics [periodiccnt];
		1156	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1157	}
		1158
		1159	ev_stop (EV_A_ (W)w);
		1160	}
		1161
		1162	void
		1163	ev_idle_start (EV_P_ struct ev_idle *w)
		1164	{
		1165	if (ev_is_active (w))
		1166	return;
		1167
		1168	ev_start (EV_A_ (W)w, ++idlecnt);
		1169	array_needsize (idles, idlemax, idlecnt, );
		1170	idles [idlecnt - 1] = w;
		1171	}
		1172
		1173	void
		1174	ev_idle_stop (EV_P_ struct ev_idle *w)
		1175	{
		1176	ev_clear_pending (EV_A_ (W)w);
		1177	if (ev_is_active (w))
		1178	return;
		1179
		1180	idles [w->active - 1] = idles [--idlecnt];
		1181	ev_stop (EV_A_ (W)w);
		1182	}
		1183
		1184	void
		1185	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1186	{
		1187	if (ev_is_active (w))
		1188	return;
		1189
		1190	ev_start (EV_A_ (W)w, ++preparecnt);
		1191	array_needsize (prepares, preparemax, preparecnt, );
		1192	prepares [preparecnt - 1] = w;
		1193	}
		1194
		1195	void
		1196	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1197	{
		1198	ev_clear_pending (EV_A_ (W)w);
		1199	if (ev_is_active (w))
		1200	return;
		1201
		1202	prepares [w->active - 1] = prepares [--preparecnt];
		1203	ev_stop (EV_A_ (W)w);
		1204	}
		1205
		1206	void
		1207	ev_check_start (EV_P_ struct ev_check *w)
		1208	{
		1209	if (ev_is_active (w))
		1210	return;
		1211
		1212	ev_start (EV_A_ (W)w, ++checkcnt);
		1213	array_needsize (checks, checkmax, checkcnt, );
		1214	checks [checkcnt - 1] = w;
		1215	}
		1216
		1217	void
		1218	ev_check_stop (EV_P_ struct ev_check *w)
		1219	{
		1220	ev_clear_pending (EV_A_ (W)w);
		1221	if (ev_is_active (w))
		1222	return;
		1223
		1224	checks [w->active - 1] = checks [--checkcnt];
		1225	ev_stop (EV_A_ (W)w);
		1226	}
		1227
		1228	#ifndef SA_RESTART
		1229	# define SA_RESTART 0
		1230	#endif
		1231
		1232	void
		1233	ev_signal_start (EV_P_ struct ev_signal *w)
		1234	{
		1235	#if EV_MULTIPLICITY
		1236	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1237	#endif
		1238	if (ev_is_active (w))
		1239	return;
		1240
		1241	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1242
		1243	ev_start (EV_A_ (W)w, 1);
		1244	array_needsize (signals, signalmax, w->signum, signals_init);
		1245	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1246
		1247	if (!w->next)
		1248	{
		1249	struct sigaction sa;
		1250	sa.sa_handler = sighandler;
		1251	sigfillset (&sa.sa_mask);
		1252	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1253	sigaction (w->signum, &sa, 0);
		1254	}
		1255	}
		1256
		1257	void
		1258	ev_signal_stop (EV_P_ struct ev_signal *w)
		1259	{
		1260	ev_clear_pending (EV_A_ (W)w);
		1261	if (!ev_is_active (w))
		1262	return;
		1263
		1264	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1265	ev_stop (EV_A_ (W)w);
		1266
		1267	if (!signals [w->signum - 1].head)
		1268	signal (w->signum, SIG_DFL);
		1269	}
		1270
		1271	void
		1272	ev_child_start (EV_P_ struct ev_child *w)
		1273	{
		1274	#if EV_MULTIPLICITY
		1275	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1276	#endif
		1277	if (ev_is_active (w))
		1278	return;
		1279
		1280	ev_start (EV_A_ (W)w, 1);
		1281	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1282	}
		1283
		1284	void
		1285	ev_child_stop (EV_P_ struct ev_child *w)
		1286	{
		1287	ev_clear_pending (EV_A_ (W)w);
		1288	if (ev_is_active (w))
		1289	return;
		1290
		1291	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1292	ev_stop (EV_A_ (W)w);
		1293	}
		1294
		1295	/*****************************************************************************/
		1296
		1297	struct ev_once
		1298	{
		1299	struct ev_io io;
		1300	struct ev_timer to;
		1301	void (*cb)(int revents, void *arg);
		1302	void *arg;
		1303	};
		1304
		1305	static void
		1306	once_cb (EV_P_ struct ev_once *once, int revents)
		1307	{
		1308	void (*cb)(int revents, void *arg) = once->cb;
		1309	void *arg = once->arg;
		1310
		1311	ev_io_stop (EV_A_ &once->io);
		1312	ev_timer_stop (EV_A_ &once->to);
		1313	free (once);
		1314
		1315	cb (revents, arg);
		1316	}
		1317
		1318	static void
		1319	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1320	{
		1321	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1322	}
		1323
		1324	static void
		1325	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1326	{
		1327	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1328	}
		1329
		1330	void
		1331	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1332	{
		1333	struct ev_once *once = malloc (sizeof (struct ev_once));
		1334
		1335	if (!once)
		1336	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1337	else
496	{	1338	{
497	w->at += now;	1339	once->cb = cb;
		1340	once->arg = arg;
498		1341
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1342	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1343	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	{	1344	{
517	atimers [w->active - 1] = atimers [atimercnt];	1345	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1346	ev_io_start (EV_A_ &once->io);
519	}	1347	}
520	}	1348
521	else	1349	ev_watcher_init (&once->to, once_cb_to);
522	{	1350	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1351	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1352	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1353	ev_timer_start (EV_A_ &once->to);
527	}	1354	}
528	}	1355	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1356	}
532		1357
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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