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Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.129 by root, Fri Nov 23 05:00:44 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
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# else
		47	# ifndef EV_USE_MONOTONIC
		48	# define EV_USE_MONOTONIC 0
		49	# endif
		50	# ifndef EV_USE_REALTIME
		51	# define EV_USE_REALTIME 0
		52	# endif
		53	# endif
		54
		55	# ifndef EV_USE_SELECT
		56	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		57	# define EV_USE_SELECT 1
		58	# else
		59	# define EV_USE_SELECT 0
		60	# endif
		61	# endif
		62
		63	# ifndef EV_USE_POLL
		64	# if HAVE_POLL && HAVE_POLL_H
		65	# define EV_USE_POLL 1
		66	# else
		67	# define EV_USE_POLL 0
		68	# endif
		69	# endif
		70
		71	# ifndef EV_USE_EPOLL
		72	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		73	# define EV_USE_EPOLL 1
		74	# else
		75	# define EV_USE_EPOLL 0
		76	# endif
		77	# endif
		78
		79	# ifndef EV_USE_KQUEUE
		80	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		81	# define EV_USE_KQUEUE 1
		82	# else
		83	# define EV_USE_KQUEUE 0
		84	# endif
		85	# endif
		86
		87	# ifndef EV_USE_PORT
		88	# if HAVE_PORT_H && HAVE_PORT_CREATE
		89	# define EV_USE_PORT 1
		90	# else
		91	# define EV_USE_PORT 0
		92	# endif
		93	# endif
		94
		95	#endif
		96
1	#include <math.h>	97	#include <math.h>
2	#include <stdlib.h>	98	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	99	#include <fcntl.h>
5	#include <signal.h>	100	#include <stddef.h>
6		101
7	#include <stdio.h>	102	#include <stdio.h>
8		103
9	#include <assert.h>	104	#include <assert.h>
10	#include <errno.h>	105	#include <errno.h>
11	#include <sys/time.h>	106	#include <sys/types.h>
12	#include <time.h>	107	#include <time.h>
13		108
14	#ifndef HAVE_MONOTONIC	109	#include <signal.h>
15	# ifdef CLOCK_MONOTONIC	110
16	# define HAVE_MONOTONIC 1	111	#ifndef _WIN32
		112	# include <unistd.h>
		113	# include <sys/time.h>
		114	# include <sys/wait.h>
		115	#else
		116	# define WIN32_LEAN_AND_MEAN
		117	# include <windows.h>
		118	# ifndef EV_SELECT_IS_WINSOCKET
		119	# define EV_SELECT_IS_WINSOCKET 1
17	# endif	120	# endif
18	#endif	121	#endif
19		122
		123	/**/
		124
		125	#ifndef EV_USE_MONOTONIC
		126	# define EV_USE_MONOTONIC 0
		127	#endif
		128
		129	#ifndef EV_USE_REALTIME
		130	# define EV_USE_REALTIME 0
		131	#endif
		132
20	#ifndef HAVE_SELECT	133	#ifndef EV_USE_SELECT
21	# define HAVE_SELECT 1	134	# define EV_USE_SELECT 1
		135	#endif
		136
		137	#ifndef EV_USE_POLL
		138	# ifdef _WIN32
		139	# define EV_USE_POLL 0
		140	# else
		141	# define EV_USE_POLL 1
22	#endif	142	# endif
		143	#endif
23		144
24	#ifndef HAVE_EPOLL	145	#ifndef EV_USE_EPOLL
25	# define HAVE_EPOLL 0	146	# define EV_USE_EPOLL 0
26	#endif	147	#endif
27		148
		149	#ifndef EV_USE_KQUEUE
		150	# define EV_USE_KQUEUE 0
		151	#endif
		152
		153	#ifndef EV_USE_PORT
		154	# define EV_USE_PORT 0
		155	#endif
		156
		157	/**/
		158
		159	#ifndef CLOCK_MONOTONIC
		160	# undef EV_USE_MONOTONIC
		161	# define EV_USE_MONOTONIC 0
		162	#endif
		163
28	#ifndef HAVE_REALTIME	164	#ifndef CLOCK_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	165	# undef EV_USE_REALTIME
		166	# define EV_USE_REALTIME 0
30	#endif	167	#endif
		168
		169	#if EV_SELECT_IS_WINSOCKET
		170	# include <winsock.h>
		171	#endif
		172
		173	/**/
31		174
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	175	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	176	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		177	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		178	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
34		179
		180	#ifdef EV_H
		181	# include EV_H
		182	#else
35	#include "ev.h"	183	# include "ev.h"
		184	#endif
36		185
37	struct ev_watcher {	186	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	187	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	188	# define inline static inline
		189	#else
		190	# define expect(expr,value) (expr)
		191	# define inline static
		192	#endif
40		193
41	struct ev_watcher_list {	194	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	195	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	196
		197	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		198	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		199
		200	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		201	#define EMPTY2(a,b) /* used to suppress some warnings */
44		202
45	typedef struct ev_watcher *W;	203	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	204	typedef struct ev_watcher_list *WL;
		205	typedef struct ev_watcher_time *WT;
47		206
48	static ev_tstamp now, diff; /* monotonic clock */	207	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		208
		209	#ifdef _WIN32
		210	# include "ev_win32.c"
		211	#endif
		212
		213	/*****************************************************************************/
		214
		215	static void (*syserr_cb)(const char *msg);
		216
		217	void ev_set_syserr_cb (void (*cb)(const char *msg))
		218	{
		219	syserr_cb = cb;
		220	}
		221
		222	static void
		223	syserr (const char *msg)
		224	{
		225	if (!msg)
		226	msg = "(libev) system error";
		227
		228	if (syserr_cb)
		229	syserr_cb (msg);
		230	else
		231	{
		232	perror (msg);
		233	abort ();
		234	}
		235	}
		236
		237	static void *(*alloc)(void *ptr, long size);
		238
		239	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		240	{
		241	alloc = cb;
		242	}
		243
		244	static void *
		245	ev_realloc (void *ptr, long size)
		246	{
		247	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		248
		249	if (!ptr && size)
		250	{
		251	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		252	abort ();
		253	}
		254
		255	return ptr;
		256	}
		257
		258	#define ev_malloc(size) ev_realloc (0, (size))
		259	#define ev_free(ptr) ev_realloc ((ptr), 0)
		260
		261	/*****************************************************************************/
		262
		263	typedef struct
		264	{
		265	WL head;
		266	unsigned char events;
		267	unsigned char reify;
		268	#if EV_SELECT_IS_WINSOCKET
		269	SOCKET handle;
		270	#endif
		271	} ANFD;
		272
		273	typedef struct
		274	{
		275	W w;
		276	int events;
		277	} ANPENDING;
		278
		279	#if EV_MULTIPLICITY
		280
		281	struct ev_loop
		282	{
		283	ev_tstamp ev_rt_now;
		284	#define ev_rt_now ((loop)->ev_rt_now)
		285	#define VAR(name,decl) decl;
		286	#include "ev_vars.h"
		287	#undef VAR
		288	};
		289	#include "ev_wrap.h"
		290
		291	static struct ev_loop default_loop_struct;
		292	struct ev_loop *ev_default_loop_ptr;
		293
		294	#else
		295
49	ev_tstamp ev_now;	296	ev_tstamp ev_rt_now;
50	int ev_method;	297	#define VAR(name,decl) static decl;
		298	#include "ev_vars.h"
		299	#undef VAR
51		300
52	static int have_monotonic; /* runtime */	301	static int ev_default_loop_ptr;
53		302
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	303	#endif
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		304
58	/*****************************************************************************/	305	/*****************************************************************************/
59		306
60	ev_tstamp	307	ev_tstamp
61	ev_time (void)	308	ev_time (void)
62	{	309	{
63	#if HAVE_REALTIME	310	#if EV_USE_REALTIME
64	struct timespec ts;	311	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	312	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	313	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	314	#else
68	struct timeval tv;	315	struct timeval tv;
69	gettimeofday (&tv, 0);	316	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	317	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	318	#endif
72	}	319	}
73		320
74	static ev_tstamp	321	inline ev_tstamp
75	get_clock (void)	322	get_clock (void)
76	{	323	{
77	#if HAVE_MONOTONIC	324	#if EV_USE_MONOTONIC
78	if (have_monotonic)	325	if (expect_true (have_monotonic))
79	{	326	{
80	struct timespec ts;	327	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	328	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	329	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	330	}
84	#endif	331	#endif
85		332
86	return ev_time ();	333	return ev_time ();
87	}	334	}
88		335
		336	#if EV_MULTIPLICITY
		337	ev_tstamp
		338	ev_now (EV_P)
		339	{
		340	return ev_rt_now;
		341	}
		342	#endif
		343
		344	#define array_roundsize(type,n) (((n) | 4) & ~3)
		345
89	#define array_needsize(base,cur,cnt,init) \	346	#define array_needsize(type,base,cur,cnt,init) \
90	if ((cnt) > cur) \	347	if (expect_false ((cnt) > cur)) \
91	{ \	348	{ \
92	int newcnt = cur ? cur << 1 : 16; \	349	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	350	do \
		351	{ \
		352	newcnt = array_roundsize (type, newcnt << 1); \
		353	} \
		354	while ((cnt) > newcnt); \
		355	\
94	base = realloc (base, sizeof (*base) * (newcnt)); \	356	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
95	init (base + cur, newcnt - cur); \	357	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	358	cur = newcnt; \
97	}	359	}
		360
		361	#define array_slim(type,stem) \
		362	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		363	{ \
		364	stem ## max = array_roundsize (stem ## cnt >> 1); \
		365	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		366	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		367	}
		368
		369	#define array_free(stem, idx) \
		370	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		371
99	/*****************************************************************************/	372	/*****************************************************************************/
100		373
101	typedef struct
102	{
103	struct ev_io *head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	374	static void
114	anfds_init (ANFD *base, int count)	375	anfds_init (ANFD *base, int count)
115	{	376	{
116	while (count--)	377	while (count--)
117	{	378	{
118	base->head = 0;	379	base->head = 0;
119	base->wev = base->rev = EV_NONE;	380	base->events = EV_NONE;
		381	base->reify = 0;
		382
120	++base;	383	++base;
121	}	384	}
122	}	385	}
123		386
124	typedef struct	387	void
		388	ev_feed_event (EV_P_ void *w, int revents)
125	{	389	{
126	W w;	390	W w_ = (W)w;
127	int events;
128	} ANPENDING;
129		391
130	static ANPENDING *pendings;	392	if (expect_false (w_->pending))
131	static int pendingmax, pendingcnt;	393	{
		394	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		395	return;
		396	}
132		397
133	static void
134	event (W w, int events)
135	{
136	w->pending = ++pendingcnt;	398	w_->pending = ++pendingcnt [ABSPRI (w_)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	399	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
138	pendings [pendingcnt - 1].w = w;	400	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
139	pendings [pendingcnt - 1].events = events;	401	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
140	}	402	}
141		403
142	static void	404	static void
		405	queue_events (EV_P_ W *events, int eventcnt, int type)
		406	{
		407	int i;
		408
		409	for (i = 0; i < eventcnt; ++i)
		410	ev_feed_event (EV_A_ events [i], type);
		411	}
		412
		413	inline void
143	fd_event (int fd, int events)	414	fd_event (EV_P_ int fd, int revents)
144	{	415	{
145	ANFD *anfd = anfds + fd;	416	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	417	struct ev_io *w;
147		418
148	for (w = anfd->head; w; w = w->next)	419	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
149	{	420	{
150	int ev = w->events & events;	421	int ev = w->events & revents;
151		422
152	if (ev)	423	if (ev)
153	event ((W)w, ev);	424	ev_feed_event (EV_A_ (W)w, ev);
154	}	425	}
155	}	426	}
156		427
157	static void	428	void
158	queue_events (W *events, int eventcnt, int type)	429	ev_feed_fd_event (EV_P_ int fd, int revents)
159	{	430	{
160	int i;	431	fd_event (EV_A_ fd, revents);
161
162	for (i = 0; i < eventcnt; ++i)
163	event (events [i], type);
164	}	432	}
165		433
166	/*****************************************************************************/	434	/*****************************************************************************/
167		435
168	static struct ev_timer **atimers;	436	inline void
169	static int atimermax, atimercnt;	437	fd_reify (EV_P)
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void
175	upheap (struct ev_timer **timers, int k)
176	{
177	struct ev_timer *w = timers [k];
178
179	while (k && timers [k >> 1]->at > w->at)
180	{
181	timers [k] = timers [k >> 1];
182	timers [k]->active = k + 1;
183	k >>= 1;
184	}
185
186	timers [k] = w;
187	timers [k]->active = k + 1;
188
189	}
190
191	static void
192	downheap (struct ev_timer **timers, int N, int k)
193	{
194	struct ev_timer *w = timers [k];
195
196	while (k < (N >> 1))
197	{
198	int j = k << 1;
199
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
201	++j;
202
203	if (w->at <= timers [j]->at)
204	break;
205
206	timers [k] = timers [j];
207	timers [k]->active = k + 1;
208	k = j;
209	}
210
211	timers [k] = w;
212	timers [k]->active = k + 1;
213	}
214
215	/*****************************************************************************/
216
217	typedef struct
218	{
219	struct ev_signal *head;
220	sig_atomic_t gotsig;
221	} ANSIG;
222
223	static ANSIG *signals;
224	static int signalmax;
225
226	static int sigpipe [2];
227	static sig_atomic_t gotsig;
228	static struct ev_io sigev;
229
230	static void
231	signals_init (ANSIG *base, int count)
232	{
233	while (count--)
234	{
235	base->head = 0;
236	base->gotsig = 0;
237	++base;
238	}
239	}
240
241	static void
242	sighandler (int signum)
243	{
244	signals [signum - 1].gotsig = 1;
245
246	if (!gotsig)
247	{
248	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);
250	}
251	}
252
253	static void
254	sigcb (struct ev_io *iow, int revents)
255	{
256	struct ev_signal *w;
257	int sig;
258
259	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261
262	for (sig = signalmax; sig--; )
263	if (signals [sig].gotsig)
264	{
265	signals [sig].gotsig = 0;
266
267	for (w = signals [sig].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);
269	}
270	}
271
272	static void
273	siginit (void)
274	{
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277
278	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
281
282	evio_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);
284	}
285
286	/*****************************************************************************/
287
288	static struct ev_idle **idles;
289	static int idlemax, idlecnt;
290
291	static struct ev_check **checks;
292	static int checkmax, checkcnt;
293
294	/*****************************************************************************/
295
296	#if HAVE_EPOLL
297	# include "ev_epoll.c"
298	#endif
299	#if HAVE_SELECT
300	# include "ev_select.c"
301	#endif
302
303	int ev_init (int flags)
304	{
305	#if HAVE_MONOTONIC
306	{
307	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;
310	}
311	#endif
312
313	ev_now = ev_time ();
314	now = get_clock ();
315	diff = ev_now - now;
316
317	if (pipe (sigpipe))
318	return 0;
319
320	ev_method = EVMETHOD_NONE;
321	#if HAVE_EPOLL
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327
328	if (ev_method)
329	{
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}
336
337	/*****************************************************************************/
338
339	void ev_prefork (void)
340	{
341	/* nop */
342	}
343
344	void ev_postfork_parent (void)
345	{
346	/* nop */
347	}
348
349	void ev_postfork_child (void)
350	{
351	#if HAVE_EPOLL
352	if (ev_method == EVMETHOD_EPOLL)
353	epoll_postfork_child ();
354	#endif
355
356	evio_stop (&sigev);
357	close (sigpipe [0]);
358	close (sigpipe [1]);
359	pipe (sigpipe);
360	siginit ();
361	}
362
363	/*****************************************************************************/
364
365	static void
366	fd_reify (void)
367	{	438	{
368	int i;	439	int i;
369		440
370	for (i = 0; i < fdchangecnt; ++i)	441	for (i = 0; i < fdchangecnt; ++i)
371	{	442	{
372	int fd = fdchanges [i];	443	int fd = fdchanges [i];
373	ANFD *anfd = anfds + fd;	444	ANFD *anfd = anfds + fd;
374	struct ev_io *w;	445	struct ev_io *w;
375		446
376	int wev = 0;	447	int events = 0;
377		448
378	for (w = anfd->head; w; w = w->next)	449	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
379	wev |= w->events;	450	events |= w->events;
380		451
381	if (anfd->wev != wev)	452	#if EV_SELECT_IS_WINSOCKET
		453	if (events)
382	{	454	{
383	method_modify (fd, anfd->wev, wev);	455	unsigned long argp;
384	anfd->wev = wev;	456	anfd->handle = _get_osfhandle (fd);
		457	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
385	}	458	}
		459	#endif
		460
		461	anfd->reify = 0;
		462
		463	method_modify (EV_A_ fd, anfd->events, events);
		464	anfd->events = events;
386	}	465	}
387		466
388	fdchangecnt = 0;	467	fdchangecnt = 0;
389	}	468	}
390		469
391	static void	470	static void
392	call_pending ()	471	fd_change (EV_P_ int fd)
		472	{
		473	if (expect_false (anfds [fd].reify))
		474	return;
		475
		476	anfds [fd].reify = 1;
		477
		478	++fdchangecnt;
		479	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		480	fdchanges [fdchangecnt - 1] = fd;
		481	}
		482
		483	static void
		484	fd_kill (EV_P_ int fd)
		485	{
		486	struct ev_io *w;
		487
		488	while ((w = (struct ev_io *)anfds [fd].head))
		489	{
		490	ev_io_stop (EV_A_ w);
		491	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		492	}
		493	}
		494
		495	inline int
		496	fd_valid (int fd)
		497	{
		498	#ifdef _WIN32
		499	return _get_osfhandle (fd) != -1;
		500	#else
		501	return fcntl (fd, F_GETFD) != -1;
		502	#endif
		503	}
		504
		505	/* called on EBADF to verify fds */
		506	static void
		507	fd_ebadf (EV_P)
		508	{
		509	int fd;
		510
		511	for (fd = 0; fd < anfdmax; ++fd)
		512	if (anfds [fd].events)
		513	if (!fd_valid (fd) == -1 && errno == EBADF)
		514	fd_kill (EV_A_ fd);
		515	}
		516
		517	/* called on ENOMEM in select/poll to kill some fds and retry */
		518	static void
		519	fd_enomem (EV_P)
		520	{
		521	int fd;
		522
		523	for (fd = anfdmax; fd--; )
		524	if (anfds [fd].events)
		525	{
		526	fd_kill (EV_A_ fd);
		527	return;
		528	}
		529	}
		530
		531	/* usually called after fork if method needs to re-arm all fds from scratch */
		532	static void
		533	fd_rearm_all (EV_P)
		534	{
		535	int fd;
		536
		537	/* this should be highly optimised to not do anything but set a flag */
		538	for (fd = 0; fd < anfdmax; ++fd)
		539	if (anfds [fd].events)
		540	{
		541	anfds [fd].events = 0;
		542	fd_change (EV_A_ fd);
		543	}
		544	}
		545
		546	/*****************************************************************************/
		547
		548	static void
		549	upheap (WT *heap, int k)
		550	{
		551	WT w = heap [k];
		552
		553	while (k && heap [k >> 1]->at > w->at)
		554	{
		555	heap [k] = heap [k >> 1];
		556	((W)heap [k])->active = k + 1;
		557	k >>= 1;
		558	}
		559
		560	heap [k] = w;
		561	((W)heap [k])->active = k + 1;
		562
		563	}
		564
		565	static void
		566	downheap (WT *heap, int N, int k)
		567	{
		568	WT w = heap [k];
		569
		570	while (k < (N >> 1))
		571	{
		572	int j = k << 1;
		573
		574	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		575	++j;
		576
		577	if (w->at <= heap [j]->at)
		578	break;
		579
		580	heap [k] = heap [j];
		581	((W)heap [k])->active = k + 1;
		582	k = j;
		583	}
		584
		585	heap [k] = w;
		586	((W)heap [k])->active = k + 1;
		587	}
		588
		589	inline void
		590	adjustheap (WT *heap, int N, int k)
		591	{
		592	upheap (heap, k);
		593	downheap (heap, N, k);
		594	}
		595
		596	/*****************************************************************************/
		597
		598	typedef struct
		599	{
		600	WL head;
		601	sig_atomic_t volatile gotsig;
		602	} ANSIG;
		603
		604	static ANSIG *signals;
		605	static int signalmax;
		606
		607	static int sigpipe [2];
		608	static sig_atomic_t volatile gotsig;
		609	static struct ev_io sigev;
		610
		611	static void
		612	signals_init (ANSIG *base, int count)
		613	{
		614	while (count--)
		615	{
		616	base->head = 0;
		617	base->gotsig = 0;
		618
		619	++base;
		620	}
		621	}
		622
		623	static void
		624	sighandler (int signum)
		625	{
		626	#if _WIN32
		627	signal (signum, sighandler);
		628	#endif
		629
		630	signals [signum - 1].gotsig = 1;
		631
		632	if (!gotsig)
		633	{
		634	int old_errno = errno;
		635	gotsig = 1;
		636	write (sigpipe [1], &signum, 1);
		637	errno = old_errno;
		638	}
		639	}
		640
		641	void
		642	ev_feed_signal_event (EV_P_ int signum)
		643	{
		644	WL w;
		645
		646	#if EV_MULTIPLICITY
		647	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		648	#endif
		649
		650	--signum;
		651
		652	if (signum < 0 || signum >= signalmax)
		653	return;
		654
		655	signals [signum].gotsig = 0;
		656
		657	for (w = signals [signum].head; w; w = w->next)
		658	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		659	}
		660
		661	static void
		662	sigcb (EV_P_ struct ev_io *iow, int revents)
		663	{
		664	int signum;
		665
		666	read (sigpipe [0], &revents, 1);
		667	gotsig = 0;
		668
		669	for (signum = signalmax; signum--; )
		670	if (signals [signum].gotsig)
		671	ev_feed_signal_event (EV_A_ signum + 1);
		672	}
		673
		674	static void
		675	fd_intern (int fd)
		676	{
		677	#ifdef _WIN32
		678	int arg = 1;
		679	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		680	#else
		681	fcntl (fd, F_SETFD, FD_CLOEXEC);
		682	fcntl (fd, F_SETFL, O_NONBLOCK);
		683	#endif
		684	}
		685
		686	static void
		687	siginit (EV_P)
		688	{
		689	fd_intern (sigpipe [0]);
		690	fd_intern (sigpipe [1]);
		691
		692	ev_io_set (&sigev, sigpipe [0], EV_READ);
		693	ev_io_start (EV_A_ &sigev);
		694	ev_unref (EV_A); /* child watcher should not keep loop alive */
		695	}
		696
		697	/*****************************************************************************/
		698
		699	static struct ev_child *childs [PID_HASHSIZE];
		700
		701	#ifndef _WIN32
		702
		703	static struct ev_signal childev;
		704
		705	#ifndef WCONTINUED
		706	# define WCONTINUED 0
		707	#endif
		708
		709	static void
		710	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		711	{
		712	struct ev_child *w;
		713
		714	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		715	if (w->pid == pid || !w->pid)
		716	{
		717	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		718	w->rpid = pid;
		719	w->rstatus = status;
		720	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		721	}
		722	}
		723
		724	static void
		725	childcb (EV_P_ struct ev_signal *sw, int revents)
		726	{
		727	int pid, status;
		728
		729	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		730	{
		731	/* make sure we are called again until all childs have been reaped */
		732	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		733
		734	child_reap (EV_A_ sw, pid, pid, status);
		735	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		736	}
		737	}
		738
		739	#endif
		740
		741	/*****************************************************************************/
		742
		743	#if EV_USE_PORT
		744	# include "ev_port.c"
		745	#endif
		746	#if EV_USE_KQUEUE
		747	# include "ev_kqueue.c"
		748	#endif
		749	#if EV_USE_EPOLL
		750	# include "ev_epoll.c"
		751	#endif
		752	#if EV_USE_POLL
		753	# include "ev_poll.c"
		754	#endif
		755	#if EV_USE_SELECT
		756	# include "ev_select.c"
		757	#endif
		758
		759	int
		760	ev_version_major (void)
		761	{
		762	return EV_VERSION_MAJOR;
		763	}
		764
		765	int
		766	ev_version_minor (void)
		767	{
		768	return EV_VERSION_MINOR;
		769	}
		770
		771	/* return true if we are running with elevated privileges and should ignore env variables */
		772	static int
		773	enable_secure (void)
		774	{
		775	#ifdef _WIN32
		776	return 0;
		777	#else
		778	return getuid () != geteuid ()
		779	|| getgid () != getegid ();
		780	#endif
		781	}
		782
		783	unsigned int
		784	ev_supported_backends (void)
		785	{
		786	}
		787
		788	unsigned int
		789	ev_recommended_backends (void)
		790	{
		791	unsigned int flags;
		792
		793	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		794	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		795	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		796	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		797	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		798
		799	return flags;
		800	}
		801
		802	unsigned int
		803	ev_backend (EV_P)
		804	{
		805	unsigned int flags = ev_recommended_backends ();
		806
		807	#ifndef __NetBSD__
		808	/* kqueue is borked on everything but netbsd apparently */
		809	/* it usually doesn't work correctly on anything but sockets and pipes */
		810	flags &= ~EVBACKEND_KQUEUE;
		811	#endif
		812	#ifdef __APPLE__
		813	// flags &= ~EVBACKEND_KQUEUE; for documentation
		814	flags &= ~EVBACKEND_POLL;
		815	#endif
		816
		817	return flags;
		818	}
		819
		820	static void
		821	loop_init (EV_P_ unsigned int flags)
		822	{
		823	if (!method)
		824	{
		825	#if EV_USE_MONOTONIC
		826	{
		827	struct timespec ts;
		828	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		829	have_monotonic = 1;
		830	}
		831	#endif
		832
		833	ev_rt_now = ev_time ();
		834	mn_now = get_clock ();
		835	now_floor = mn_now;
		836	rtmn_diff = ev_rt_now - mn_now;
		837
		838	if (!(flags & EVFLAG_NOENV)
		839	&& !enable_secure ()
		840	&& getenv ("LIBEV_FLAGS"))
		841	flags = atoi (getenv ("LIBEV_FLAGS"));
		842
		843	if (!(flags & 0x0000ffffUL))
		844	flags |= ev_recommended_backends ();
		845
		846	method = 0;
		847	#if EV_USE_PORT
		848	if (!method && (flags & EVBACKEND_PORT )) method = port_init (EV_A_ flags);
		849	#endif
		850	#if EV_USE_KQUEUE
		851	if (!method && (flags & EVBACKEND_KQUEUE)) method = kqueue_init (EV_A_ flags);
		852	#endif
		853	#if EV_USE_EPOLL
		854	if (!method && (flags & EVBACKEND_EPOLL )) method = epoll_init (EV_A_ flags);
		855	#endif
		856	#if EV_USE_POLL
		857	if (!method && (flags & EVBACKEND_POLL )) method = poll_init (EV_A_ flags);
		858	#endif
		859	#if EV_USE_SELECT
		860	if (!method && (flags & EVBACKEND_SELECT)) method = select_init (EV_A_ flags);
		861	#endif
		862
		863	ev_init (&sigev, sigcb);
		864	ev_set_priority (&sigev, EV_MAXPRI);
		865	}
		866	}
		867
		868	static void
		869	loop_destroy (EV_P)
393	{	870	{
394	int i;	871	int i;
395		872
396	for (i = 0; i < pendingcnt; ++i)	873	#if EV_USE_PORT
		874	if (method == EVBACKEND_PORT ) port_destroy (EV_A);
		875	#endif
		876	#if EV_USE_KQUEUE
		877	if (method == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		878	#endif
		879	#if EV_USE_EPOLL
		880	if (method == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		881	#endif
		882	#if EV_USE_POLL
		883	if (method == EVBACKEND_POLL ) poll_destroy (EV_A);
		884	#endif
		885	#if EV_USE_SELECT
		886	if (method == EVBACKEND_SELECT) select_destroy (EV_A);
		887	#endif
		888
		889	for (i = NUMPRI; i--; )
		890	array_free (pending, [i]);
		891
		892	/* have to use the microsoft-never-gets-it-right macro */
		893	array_free (fdchange, EMPTY0);
		894	array_free (timer, EMPTY0);
		895	#if EV_PERIODICS
		896	array_free (periodic, EMPTY0);
		897	#endif
		898	array_free (idle, EMPTY0);
		899	array_free (prepare, EMPTY0);
		900	array_free (check, EMPTY0);
		901
		902	method = 0;
		903	}
		904
		905	static void
		906	loop_fork (EV_P)
		907	{
		908	#if EV_USE_PORT
		909	if (method == EVBACKEND_PORT ) port_fork (EV_A);
		910	#endif
		911	#if EV_USE_KQUEUE
		912	if (method == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		913	#endif
		914	#if EV_USE_EPOLL
		915	if (method == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		916	#endif
		917
		918	if (ev_is_active (&sigev))
		919	{
		920	/* default loop */
		921
		922	ev_ref (EV_A);
		923	ev_io_stop (EV_A_ &sigev);
		924	close (sigpipe [0]);
		925	close (sigpipe [1]);
		926
		927	while (pipe (sigpipe))
		928	syserr ("(libev) error creating pipe");
		929
		930	siginit (EV_A);
397	{	931	}
398	ANPENDING *p = pendings + i;
399		932
400	if (p->w)	933	postfork = 0;
		934	}
		935
		936	#if EV_MULTIPLICITY
		937	struct ev_loop *
		938	ev_loop_new (unsigned int flags)
		939	{
		940	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		941
		942	memset (loop, 0, sizeof (struct ev_loop));
		943
		944	loop_init (EV_A_ flags);
		945
		946	if (ev_method (EV_A))
		947	return loop;
		948
		949	return 0;
		950	}
		951
		952	void
		953	ev_loop_destroy (EV_P)
		954	{
		955	loop_destroy (EV_A);
		956	ev_free (loop);
		957	}
		958
		959	void
		960	ev_loop_fork (EV_P)
		961	{
		962	postfork = 1;
		963	}
		964
		965	#endif
		966
		967	#if EV_MULTIPLICITY
		968	struct ev_loop *
		969	ev_default_loop_init (unsigned int flags)
		970	#else
		971	int
		972	ev_default_loop (unsigned int flags)
		973	#endif
		974	{
		975	if (sigpipe [0] == sigpipe [1])
		976	if (pipe (sigpipe))
		977	return 0;
		978
		979	if (!ev_default_loop_ptr)
		980	{
		981	#if EV_MULTIPLICITY
		982	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		983	#else
		984	ev_default_loop_ptr = 1;
		985	#endif
		986
		987	loop_init (EV_A_ flags);
		988
		989	if (ev_method (EV_A))
401	{	990	{
402	p->w->pending = 0;	991	siginit (EV_A);
403	p->w->cb (p->w, p->events);	992
		993	#ifndef _WIN32
		994	ev_signal_init (&childev, childcb, SIGCHLD);
		995	ev_set_priority (&childev, EV_MAXPRI);
		996	ev_signal_start (EV_A_ &childev);
		997	ev_unref (EV_A); /* child watcher should not keep loop alive */
		998	#endif
404	}	999	}
		1000	else
		1001	ev_default_loop_ptr = 0;
		1002	}
		1003
		1004	return ev_default_loop_ptr;
		1005	}
		1006
		1007	void
		1008	ev_default_destroy (void)
		1009	{
		1010	#if EV_MULTIPLICITY
		1011	struct ev_loop *loop = ev_default_loop_ptr;
		1012	#endif
		1013
		1014	#ifndef _WIN32
		1015	ev_ref (EV_A); /* child watcher */
		1016	ev_signal_stop (EV_A_ &childev);
		1017	#endif
		1018
		1019	ev_ref (EV_A); /* signal watcher */
		1020	ev_io_stop (EV_A_ &sigev);
		1021
		1022	close (sigpipe [0]); sigpipe [0] = 0;
		1023	close (sigpipe [1]); sigpipe [1] = 0;
		1024
		1025	loop_destroy (EV_A);
		1026	}
		1027
		1028	void
		1029	ev_default_fork (void)
		1030	{
		1031	#if EV_MULTIPLICITY
		1032	struct ev_loop *loop = ev_default_loop_ptr;
		1033	#endif
		1034
		1035	if (method)
		1036	postfork = 1;
		1037	}
		1038
		1039	/*****************************************************************************/
		1040
		1041	static int
		1042	any_pending (EV_P)
		1043	{
		1044	int pri;
		1045
		1046	for (pri = NUMPRI; pri--; )
		1047	if (pendingcnt [pri])
		1048	return 1;
		1049
		1050	return 0;
		1051	}
		1052
		1053	inline void
		1054	call_pending (EV_P)
		1055	{
		1056	int pri;
		1057
		1058	for (pri = NUMPRI; pri--; )
		1059	while (pendingcnt [pri])
		1060	{
		1061	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1062
		1063	if (expect_true (p->w))
		1064	{
		1065	p->w->pending = 0;
		1066	EV_CB_INVOKE (p->w, p->events);
		1067	}
405	}	1068	}
406
407	pendingcnt = 0;
408	}	1069	}
409		1070
410	static void	1071	inline void
411	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1072	timers_reify (EV_P)
412	{	1073	{
413	while (timercnt && timers [0]->at <= now)	1074	while (timercnt && ((WT)timers [0])->at <= mn_now)
414	{	1075	{
415	struct ev_timer *w = timers [0];	1076	struct ev_timer *w = timers [0];
		1077
		1078	assert (("inactive timer on timer heap detected", ev_is_active (w)));
416		1079
417	/* first reschedule or stop timer */	1080	/* first reschedule or stop timer */
418	if (w->repeat)	1081	if (w->repeat)
419	{	1082	{
420	if (w->is_abs)	1083	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
421	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1084
422	else
423	w->at = now + w->repeat;	1085	((WT)w)->at += w->repeat;
		1086	if (((WT)w)->at < mn_now)
		1087	((WT)w)->at = mn_now;
424		1088
425	assert (w->at > now);
426
427	downheap (timers, timercnt, 0);	1089	downheap ((WT *)timers, timercnt, 0);
428	}	1090	}
429	else	1091	else
		1092	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1093
		1094	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1095	}
		1096	}
		1097
		1098	#if EV_PERIODICS
		1099	inline void
		1100	periodics_reify (EV_P)
		1101	{
		1102	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1103	{
		1104	struct ev_periodic *w = periodics [0];
		1105
		1106	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1107
		1108	/* first reschedule or stop timer */
		1109	if (w->reschedule_cb)
430	{	1110	{
431	evtimer_stop (w); /* nonrepeating: stop timer */	1111	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
432	--timercnt; /* maybe pass by reference instead? */	1112	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1113	downheap ((WT *)periodics, periodiccnt, 0);
433	}	1114	}
		1115	else if (w->interval)
		1116	{
		1117	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1118	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1119	downheap ((WT *)periodics, periodiccnt, 0);
		1120	}
		1121	else
		1122	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
434		1123
435	event ((W)w, EV_TIMEOUT);	1124	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
436	}	1125	}
437	}	1126	}
438		1127
439	static void	1128	static void
440	time_update ()	1129	periodics_reschedule (EV_P)
441	{	1130	{
442	int i;	1131	int i;
		1132
		1133	/* adjust periodics after time jump */
		1134	for (i = 0; i < periodiccnt; ++i)
		1135	{
		1136	struct ev_periodic *w = periodics [i];
		1137
		1138	if (w->reschedule_cb)
		1139	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1140	else if (w->interval)
		1141	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1142	}
		1143
		1144	/* now rebuild the heap */
		1145	for (i = periodiccnt >> 1; i--; )
		1146	downheap ((WT *)periodics, periodiccnt, i);
		1147	}
		1148	#endif
		1149
		1150	inline int
		1151	time_update_monotonic (EV_P)
		1152	{
		1153	mn_now = get_clock ();
		1154
		1155	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1156	{
		1157	ev_rt_now = rtmn_diff + mn_now;
		1158	return 0;
		1159	}
		1160	else
		1161	{
		1162	now_floor = mn_now;
443	ev_now = ev_time ();	1163	ev_rt_now = ev_time ();
444		1164	return 1;
445	if (have_monotonic)
446	{	1165	}
447	ev_tstamp odiff = diff;	1166	}
448		1167
449	/* detecting time jumps is much more difficult */	1168	inline void
450	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1169	time_update (EV_P)
		1170	{
		1171	int i;
		1172
		1173	#if EV_USE_MONOTONIC
		1174	if (expect_true (have_monotonic))
		1175	{
		1176	if (time_update_monotonic (EV_A))
451	{	1177	{
452	now = get_clock ();	1178	ev_tstamp odiff = rtmn_diff;
		1179
		1180	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1181	{
453	diff = ev_now - now;	1182	rtmn_diff = ev_rt_now - mn_now;
454		1183
455	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1184	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
456	return; /* all is well */	1185	return; /* all is well */
457		1186
458	ev_now = ev_time ();	1187	ev_rt_now = ev_time ();
		1188	mn_now = get_clock ();
		1189	now_floor = mn_now;
		1190	}
		1191
		1192	# if EV_PERIODICS
		1193	periodics_reschedule (EV_A);
		1194	# endif
		1195	/* no timer adjustment, as the monotonic clock doesn't jump */
		1196	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
459	}	1197	}
		1198	}
		1199	else
		1200	#endif
		1201	{
		1202	ev_rt_now = ev_time ();
460		1203
461	/* time jump detected, reschedule atimers */	1204	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
462	for (i = 0; i < atimercnt; ++i)
463	{	1205	{
464	struct ev_timer *w = atimers [i];	1206	#if EV_PERIODICS
465	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1207	periodics_reschedule (EV_A);
		1208	#endif
		1209
		1210	/* adjust timers. this is easy, as the offset is the same for all */
		1211	for (i = 0; i < timercnt; ++i)
		1212	((WT)timers [i])->at += ev_rt_now - mn_now;
466	}	1213	}
467	}
468	else
469	{
470	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
471	/* time jump detected, adjust rtimers */
472	for (i = 0; i < rtimercnt; ++i)
473	rtimers [i]->at += ev_now - now;
474		1214
475	now = ev_now;	1215	mn_now = ev_rt_now;
476	}	1216	}
477	}	1217	}
478		1218
479	int ev_loop_done;	1219	void
		1220	ev_ref (EV_P)
		1221	{
		1222	++activecnt;
		1223	}
480		1224
		1225	void
		1226	ev_unref (EV_P)
		1227	{
		1228	--activecnt;
		1229	}
		1230
		1231	static int loop_done;
		1232
		1233	void
481	void ev_loop (int flags)	1234	ev_loop (EV_P_ int flags)
482	{	1235	{
483	double block;	1236	double block;
484	ev_loop_done = flags & EVLOOP_ONESHOT;	1237	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
485		1238
486	if (checkcnt)	1239	while (activecnt)
487	{	1240	{
488	queue_events ((W *)checks, checkcnt, EV_CHECK);	1241	/* queue check watchers (and execute them) */
		1242	if (expect_false (preparecnt))
		1243	{
		1244	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
489	call_pending ();	1245	call_pending (EV_A);
490	}	1246	}
491		1247
492	do	1248	/* we might have forked, so reify kernel state if necessary */
493	{	1249	if (expect_false (postfork))
		1250	loop_fork (EV_A);
		1251
494	/* update fd-related kernel structures */	1252	/* update fd-related kernel structures */
495	fd_reify ();	1253	fd_reify (EV_A);
496		1254
497	/* calculate blocking time */	1255	/* calculate blocking time */
		1256
		1257	/* we only need this for !monotonic clock or timers, but as we basically
		1258	always have timers, we just calculate it always */
		1259	#if EV_USE_MONOTONIC
		1260	if (expect_true (have_monotonic))
		1261	time_update_monotonic (EV_A);
		1262	else
		1263	#endif
		1264	{
		1265	ev_rt_now = ev_time ();
		1266	mn_now = ev_rt_now;
		1267	}
		1268
498	if (flags & EVLOOP_NONBLOCK || idlecnt)	1269	if (flags & EVLOOP_NONBLOCK || idlecnt)
499	block = 0.;	1270	block = 0.;
500	else	1271	else
501	{	1272	{
502	block = MAX_BLOCKTIME;	1273	block = MAX_BLOCKTIME;
503		1274
504	if (rtimercnt)	1275	if (timercnt)
505	{	1276	{
506	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1277	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
507	if (block > to) block = to;	1278	if (block > to) block = to;
508	}	1279	}
509		1280
		1281	#if EV_PERIODICS
510	if (atimercnt)	1282	if (periodiccnt)
511	{	1283	{
512	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1284	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
513	if (block > to) block = to;	1285	if (block > to) block = to;
514	}	1286	}
		1287	#endif
515		1288
516	if (block < 0.) block = 0.;	1289	if (expect_false (block < 0.)) block = 0.;
517	}	1290	}
518		1291
519	method_poll (block);	1292	method_poll (EV_A_ block);
520		1293
521	/* update ev_now, do magic */	1294	/* update ev_rt_now, do magic */
522	time_update ();	1295	time_update (EV_A);
523		1296
524	/* queue pending timers and reschedule them */	1297	/* queue pending timers and reschedule them */
525	/* absolute timers first */	1298	timers_reify (EV_A); /* relative timers called last */
526	timers_reify (atimers, atimercnt, ev_now);	1299	#if EV_PERIODICS
527	/* relative timers second */	1300	periodics_reify (EV_A); /* absolute timers called first */
528	timers_reify (rtimers, rtimercnt, now);	1301	#endif
529		1302
530	/* queue idle watchers unless io or timers are pending */	1303	/* queue idle watchers unless io or timers are pending */
531	if (!pendingcnt)	1304	if (idlecnt && !any_pending (EV_A))
532	queue_events ((W *)idles, idlecnt, EV_IDLE);	1305	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
533		1306
534	/* queue check and possibly idle watchers */	1307	/* queue check watchers, to be executed first */
		1308	if (expect_false (checkcnt))
535	queue_events ((W *)checks, checkcnt, EV_CHECK);	1309	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
536		1310
537	call_pending ();	1311	call_pending (EV_A);
		1312
		1313	if (expect_false (loop_done))
		1314	break;
538	}	1315	}
539	while (!ev_loop_done);	1316
		1317	if (loop_done != 2)
		1318	loop_done = 0;
		1319	}
		1320
		1321	void
		1322	ev_unloop (EV_P_ int how)
		1323	{
		1324	loop_done = how;
540	}	1325	}
541		1326
542	/*****************************************************************************/	1327	/*****************************************************************************/
543		1328
544	static void	1329	inline void
545	wlist_add (WL *head, WL elem)	1330	wlist_add (WL *head, WL elem)
546	{	1331	{
547	elem->next = *head;	1332	elem->next = *head;
548	*head = elem;	1333	*head = elem;
549	}	1334	}
550		1335
551	static void	1336	inline void
552	wlist_del (WL *head, WL elem)	1337	wlist_del (WL *head, WL elem)
553	{	1338	{
554	while (*head)	1339	while (*head)
555	{	1340	{
556	if (*head == elem)	1341	if (*head == elem)
…		…
561		1346
562	head = &(*head)->next;	1347	head = &(*head)->next;
563	}	1348	}
564	}	1349	}
565		1350
566	static void	1351	inline void
		1352	ev_clear_pending (EV_P_ W w)
		1353	{
		1354	if (w->pending)
		1355	{
		1356	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1357	w->pending = 0;
		1358	}
		1359	}
		1360
		1361	inline void
567	ev_start (W w, int active)	1362	ev_start (EV_P_ W w, int active)
568	{	1363	{
569	w->pending = 0;	1364	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1365	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1366
570	w->active = active;	1367	w->active = active;
		1368	ev_ref (EV_A);
571	}	1369	}
572		1370
573	static void	1371	inline void
574	ev_stop (W w)	1372	ev_stop (EV_P_ W w)
575	{	1373	{
576	if (w->pending)	1374	ev_unref (EV_A);
577	pendings [w->pending - 1].w = 0;
578
579	w->active = 0;	1375	w->active = 0;
580	}	1376	}
581		1377
582	/*****************************************************************************/	1378	/*****************************************************************************/
583		1379
584	void	1380	void
585	evio_start (struct ev_io *w)	1381	ev_io_start (EV_P_ struct ev_io *w)
		1382	{
		1383	int fd = w->fd;
		1384
		1385	if (expect_false (ev_is_active (w)))
		1386	return;
		1387
		1388	assert (("ev_io_start called with negative fd", fd >= 0));
		1389
		1390	ev_start (EV_A_ (W)w, 1);
		1391	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1392	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1393
		1394	fd_change (EV_A_ fd);
		1395	}
		1396
		1397	void
		1398	ev_io_stop (EV_P_ struct ev_io *w)
		1399	{
		1400	ev_clear_pending (EV_A_ (W)w);
		1401	if (expect_false (!ev_is_active (w)))
		1402	return;
		1403
		1404	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1405
		1406	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1407	ev_stop (EV_A_ (W)w);
		1408
		1409	fd_change (EV_A_ w->fd);
		1410	}
		1411
		1412	void
		1413	ev_timer_start (EV_P_ struct ev_timer *w)
		1414	{
		1415	if (expect_false (ev_is_active (w)))
		1416	return;
		1417
		1418	((WT)w)->at += mn_now;
		1419
		1420	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1421
		1422	ev_start (EV_A_ (W)w, ++timercnt);
		1423	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1424	timers [timercnt - 1] = w;
		1425	upheap ((WT *)timers, timercnt - 1);
		1426
		1427	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1428	}
		1429
		1430	void
		1431	ev_timer_stop (EV_P_ struct ev_timer *w)
		1432	{
		1433	ev_clear_pending (EV_A_ (W)w);
		1434	if (expect_false (!ev_is_active (w)))
		1435	return;
		1436
		1437	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1438
		1439	if (expect_true (((W)w)->active < timercnt--))
		1440	{
		1441	timers [((W)w)->active - 1] = timers [timercnt];
		1442	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1443	}
		1444
		1445	((WT)w)->at -= mn_now;
		1446
		1447	ev_stop (EV_A_ (W)w);
		1448	}
		1449
		1450	void
		1451	ev_timer_again (EV_P_ struct ev_timer *w)
586	{	1452	{
587	if (ev_is_active (w))	1453	if (ev_is_active (w))
		1454	{
		1455	if (w->repeat)
		1456	{
		1457	((WT)w)->at = mn_now + w->repeat;
		1458	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1459	}
		1460	else
		1461	ev_timer_stop (EV_A_ w);
		1462	}
		1463	else if (w->repeat)
		1464	{
		1465	w->at = w->repeat;
		1466	ev_timer_start (EV_A_ w);
		1467	}
		1468	}
		1469
		1470	#if EV_PERIODICS
		1471	void
		1472	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1473	{
		1474	if (expect_false (ev_is_active (w)))
588	return;	1475	return;
589		1476
590	int fd = w->fd;	1477	if (w->reschedule_cb)
		1478	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1479	else if (w->interval)
		1480	{
		1481	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1482	/* this formula differs from the one in periodic_reify because we do not always round up */
		1483	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1484	}
591		1485
592	ev_start ((W)w, 1);	1486	ev_start (EV_A_ (W)w, ++periodiccnt);
593	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1487	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
594	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1488	periodics [periodiccnt - 1] = w;
		1489	upheap ((WT *)periodics, periodiccnt - 1);
595		1490
596	++fdchangecnt;	1491	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = fd;
599	}	1492	}
600		1493
601	void	1494	void
602	evio_stop (struct ev_io *w)	1495	ev_periodic_stop (EV_P_ struct ev_periodic *w)
603	{	1496	{
		1497	ev_clear_pending (EV_A_ (W)w);
604	if (!ev_is_active (w))	1498	if (expect_false (!ev_is_active (w)))
605	return;	1499	return;
606		1500
607	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1501	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1502
		1503	if (expect_true (((W)w)->active < periodiccnt--))
		1504	{
		1505	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1506	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1507	}
		1508
608	ev_stop ((W)w);	1509	ev_stop (EV_A_ (W)w);
609
610	++fdchangecnt;
611	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612	fdchanges [fdchangecnt - 1] = w->fd;
613	}	1510	}
614		1511
615	void	1512	void
		1513	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1514	{
		1515	/* TODO: use adjustheap and recalculation */
		1516	ev_periodic_stop (EV_A_ w);
		1517	ev_periodic_start (EV_A_ w);
		1518	}
		1519	#endif
		1520
		1521	void
616	evtimer_start (struct ev_timer *w)	1522	ev_idle_start (EV_P_ struct ev_idle *w)
617	{	1523	{
618	if (ev_is_active (w))	1524	if (expect_false (ev_is_active (w)))
619	return;	1525	return;
620		1526
621	if (w->is_abs)
622	{
623	/* this formula differs from the one in timer_reify becuse we do not round up */
624	if (w->repeat)
625	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
626
627	ev_start ((W)w, ++atimercnt);	1527	ev_start (EV_A_ (W)w, ++idlecnt);
628	array_needsize (atimers, atimermax, atimercnt, );	1528	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
629	atimers [atimercnt - 1] = w;	1529	idles [idlecnt - 1] = w;
630	upheap (atimers, atimercnt - 1);
631	}
632	else
633	{
634	w->at += now;
635
636	ev_start ((W)w, ++rtimercnt);
637	array_needsize (rtimers, rtimermax, rtimercnt, );
638	rtimers [rtimercnt - 1] = w;
639	upheap (rtimers, rtimercnt - 1);
640	}
641
642	}	1530	}
643		1531
644	void	1532	void
645	evtimer_stop (struct ev_timer *w)	1533	ev_idle_stop (EV_P_ struct ev_idle *w)
646	{	1534	{
		1535	ev_clear_pending (EV_A_ (W)w);
647	if (!ev_is_active (w))	1536	if (expect_false (!ev_is_active (w)))
648	return;	1537	return;
649		1538
650	if (w->is_abs)	1539	idles [((W)w)->active - 1] = idles [--idlecnt];
651	{
652	if (w->active < atimercnt--)
653	{
654	atimers [w->active - 1] = atimers [atimercnt];
655	downheap (atimers, atimercnt, w->active - 1);
656	}
657	}
658	else
659	{
660	if (w->active < rtimercnt--)
661	{
662	rtimers [w->active - 1] = rtimers [rtimercnt];
663	downheap (rtimers, rtimercnt, w->active - 1);
664	}
665	}
666
667	ev_stop ((W)w);	1540	ev_stop (EV_A_ (W)w);
668	}	1541	}
669		1542
670	void	1543	void
671	evsignal_start (struct ev_signal *w)	1544	ev_prepare_start (EV_P_ struct ev_prepare *w)
672	{	1545	{
673	if (ev_is_active (w))	1546	if (expect_false (ev_is_active (w)))
674	return;	1547	return;
675		1548
		1549	ev_start (EV_A_ (W)w, ++preparecnt);
		1550	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1551	prepares [preparecnt - 1] = w;
		1552	}
		1553
		1554	void
		1555	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1556	{
		1557	ev_clear_pending (EV_A_ (W)w);
		1558	if (expect_false (!ev_is_active (w)))
		1559	return;
		1560
		1561	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1562	ev_stop (EV_A_ (W)w);
		1563	}
		1564
		1565	void
		1566	ev_check_start (EV_P_ struct ev_check *w)
		1567	{
		1568	if (expect_false (ev_is_active (w)))
		1569	return;
		1570
		1571	ev_start (EV_A_ (W)w, ++checkcnt);
		1572	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1573	checks [checkcnt - 1] = w;
		1574	}
		1575
		1576	void
		1577	ev_check_stop (EV_P_ struct ev_check *w)
		1578	{
		1579	ev_clear_pending (EV_A_ (W)w);
		1580	if (expect_false (!ev_is_active (w)))
		1581	return;
		1582
		1583	checks [((W)w)->active - 1] = checks [--checkcnt];
		1584	ev_stop (EV_A_ (W)w);
		1585	}
		1586
		1587	#ifndef SA_RESTART
		1588	# define SA_RESTART 0
		1589	#endif
		1590
		1591	void
		1592	ev_signal_start (EV_P_ struct ev_signal *w)
		1593	{
		1594	#if EV_MULTIPLICITY
		1595	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1596	#endif
		1597	if (expect_false (ev_is_active (w)))
		1598	return;
		1599
		1600	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1601
676	ev_start ((W)w, 1);	1602	ev_start (EV_A_ (W)w, 1);
677	array_needsize (signals, signalmax, w->signum, signals_init);	1603	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
678	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1604	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679		1605
680	if (!w->next)	1606	if (!((WL)w)->next)
681	{	1607	{
		1608	#if _WIN32
		1609	signal (w->signum, sighandler);
		1610	#else
682	struct sigaction sa;	1611	struct sigaction sa;
683	sa.sa_handler = sighandler;	1612	sa.sa_handler = sighandler;
684	sigfillset (&sa.sa_mask);	1613	sigfillset (&sa.sa_mask);
685	sa.sa_flags = 0;	1614	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
686	sigaction (w->signum, &sa, 0);	1615	sigaction (w->signum, &sa, 0);
		1616	#endif
687	}	1617	}
688	}	1618	}
689		1619
690	void	1620	void
691	evsignal_stop (struct ev_signal *w)	1621	ev_signal_stop (EV_P_ struct ev_signal *w)
692	{	1622	{
		1623	ev_clear_pending (EV_A_ (W)w);
693	if (!ev_is_active (w))	1624	if (expect_false (!ev_is_active (w)))
694	return;	1625	return;
695		1626
696	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1627	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697	ev_stop ((W)w);	1628	ev_stop (EV_A_ (W)w);
698		1629
699	if (!signals [w->signum - 1].head)	1630	if (!signals [w->signum - 1].head)
700	signal (w->signum, SIG_DFL);	1631	signal (w->signum, SIG_DFL);
701	}	1632	}
702		1633
703	void evidle_start (struct ev_idle *w)	1634	void
		1635	ev_child_start (EV_P_ struct ev_child *w)
704	{	1636	{
		1637	#if EV_MULTIPLICITY
		1638	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1639	#endif
705	if (ev_is_active (w))	1640	if (expect_false (ev_is_active (w)))
706	return;	1641	return;
707		1642
708	ev_start ((W)w, ++idlecnt);	1643	ev_start (EV_A_ (W)w, 1);
709	array_needsize (idles, idlemax, idlecnt, );	1644	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
710	idles [idlecnt - 1] = w;
711	}	1645	}
712		1646
713	void evidle_stop (struct ev_idle *w)	1647	void
		1648	ev_child_stop (EV_P_ struct ev_child *w)
714	{	1649	{
715	idles [w->active - 1] = idles [--idlecnt];	1650	ev_clear_pending (EV_A_ (W)w);
716	ev_stop ((W)w);	1651	if (expect_false (!ev_is_active (w)))
717	}
718
719	void evcheck_start (struct ev_check *w)
720	{
721	if (ev_is_active (w))
722	return;	1652	return;
723		1653
724	ev_start ((W)w, ++checkcnt);	1654	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
725	array_needsize (checks, checkmax, checkcnt, );
726	checks [checkcnt - 1] = w;
727	}
728
729	void evcheck_stop (struct ev_check *w)
730	{
731	checks [w->active - 1] = checks [--checkcnt];
732	ev_stop ((W)w);	1655	ev_stop (EV_A_ (W)w);
733	}	1656	}
734		1657
735	/*****************************************************************************/	1658	/*****************************************************************************/
736		1659
737	#if 0	1660	struct ev_once
738
739	static void
740	sin_cb (struct ev_io *w, int revents)
741	{	1661	{
742	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
743	}
744
745	static void
746	ocb (struct ev_timer *w, int revents)
747	{
748	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
749	evtimer_stop (w);
750	evtimer_start (w);
751	}
752
753	static void
754	scb (struct ev_signal *w, int revents)
755	{
756	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
757	}
758
759	static void
760	gcb (struct ev_signal *w, int revents)
761	{
762	fprintf (stderr, "generic %x\n", revents);
763	}
764
765	int main (void)
766	{
767	struct ev_io sin;	1662	struct ev_io io;
768
769	ev_init (0);
770
771	evw_init (&sin, sin_cb, 55);
772	evio_set (&sin, 0, EV_READ);
773	evio_start (&sin);
774
775	struct ev_timer t[10000];
776
777	#if 0
778	int i;
779	for (i = 0; i < 10000; ++i)
780	{
781	struct ev_timer *w = t + i;
782	evw_init (w, ocb, i);
783	evtimer_set_abs (w, drand48 (), 0.99775533);
784	evtimer_start (w);
785	if (drand48 () < 0.5)
786	evtimer_stop (w);
787	}
788	#endif
789
790	struct ev_timer t1;	1663	struct ev_timer to;
791	evw_init (&t1, ocb, 0);	1664	void (*cb)(int revents, void *arg);
792	evtimer_set_abs (&t1, 5, 10);	1665	void *arg;
793	evtimer_start (&t1);	1666	};
794		1667
795	struct ev_signal sig;	1668	static void
796	evw_init (&sig, scb, 65535);	1669	once_cb (EV_P_ struct ev_once *once, int revents)
797	evsignal_set (&sig, SIGQUIT);	1670	{
798	evsignal_start (&sig);	1671	void (*cb)(int revents, void *arg) = once->cb;
		1672	void *arg = once->arg;
799		1673
800	struct ev_check cw;	1674	ev_io_stop (EV_A_ &once->io);
801	evw_init (&cw, gcb, 0);	1675	ev_timer_stop (EV_A_ &once->to);
802	evcheck_start (&cw);	1676	ev_free (once);
803		1677
804	struct ev_idle iw;	1678	cb (revents, arg);
805	evw_init (&iw, gcb, 0);	1679	}
806	evidle_start (&iw);
807		1680
808	ev_loop (0);	1681	static void
		1682	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1683	{
		1684	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1685	}
809		1686
		1687	static void
		1688	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1689	{
		1690	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1691	}
		1692
		1693	void
		1694	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1695	{
		1696	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1697
		1698	if (expect_false (!once))
		1699	{
		1700	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
810	return 0;	1701	return;
811	}	1702	}
812		1703
813	#endif	1704	once->cb = cb;
		1705	once->arg = arg;
814		1706
		1707	ev_init (&once->io, once_cb_io);
		1708	if (fd >= 0)
		1709	{
		1710	ev_io_set (&once->io, fd, events);
		1711	ev_io_start (EV_A_ &once->io);
		1712	}
815		1713
		1714	ev_init (&once->to, once_cb_to);
		1715	if (timeout >= 0.)
		1716	{
		1717	ev_timer_set (&once->to, timeout, 0.);
		1718	ev_timer_start (EV_A_ &once->to);
		1719	}
		1720	}
816		1721
		1722	#ifdef __cplusplus
		1723	}
		1724	#endif
817		1725

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