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Comparing libev/ev.c (file contents):
Revision 1.14 by root, Wed Oct 31 11:52:12 2007 UTC vs.
Revision 1.124 by root, Sat Nov 17 02:26:24 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	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	# if HAVE_PORT_H && HAVE_PORT_CREATE && !defined (EV_USE_PORT)
		65	# define EV_USE_PORT 1
		66	# endif
		67
		68	#endif
		69
1	#include <math.h>	70	#include <math.h>
2	#include <stdlib.h>	71	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	72	#include <fcntl.h>
5	#include <signal.h>	73	#include <stddef.h>
6		74
7	#include <stdio.h>	75	#include <stdio.h>
8		76
9	#include <assert.h>	77	#include <assert.h>
10	#include <errno.h>	78	#include <errno.h>
11	#include <sys/time.h>	79	#include <sys/types.h>
12	#include <time.h>	80	#include <time.h>
13		81
14	#define HAVE_EPOLL 1	82	#include <signal.h>
15		83
16	#ifndef HAVE_MONOTONIC	84	#ifndef _WIN32
17	# ifdef CLOCK_MONOTONIC	85	# include <unistd.h>
18	# define HAVE_MONOTONIC 1	86	# include <sys/time.h>
		87	# include <sys/wait.h>
		88	#else
		89	# define WIN32_LEAN_AND_MEAN
		90	# include <windows.h>
		91	# ifndef EV_SELECT_IS_WINSOCKET
		92	# define EV_SELECT_IS_WINSOCKET 1
19	# endif	93	# endif
20	#endif	94	#endif
21		95
		96	/**/
		97
		98	#ifndef EV_USE_MONOTONIC
		99	# define EV_USE_MONOTONIC 0
		100	#endif
		101
		102	#ifndef EV_USE_REALTIME
		103	# define EV_USE_REALTIME 0
		104	#endif
		105
22	#ifndef HAVE_SELECT	106	#ifndef EV_USE_SELECT
23	# define HAVE_SELECT 1	107	# define EV_USE_SELECT 1
		108	#endif
		109
		110	#ifndef EV_USE_POLL
		111	# ifdef _WIN32
		112	# define EV_USE_POLL 0
		113	# else
		114	# define EV_USE_POLL 1
24	#endif	115	# endif
		116	#endif
25		117
26	#ifndef HAVE_EPOLL	118	#ifndef EV_USE_EPOLL
27	# define HAVE_EPOLL 0	119	# define EV_USE_EPOLL 0
28	#endif	120	#endif
29		121
		122	#ifndef EV_USE_KQUEUE
		123	# define EV_USE_KQUEUE 0
		124	#endif
		125
		126	#ifndef EV_USE_PORT
		127	# define EV_USE_PORT 0
		128	#endif
		129
		130	/**/
		131
		132	/* darwin simply cannot be helped */
		133	#ifdef __APPLE__
		134	# undef EV_USE_POLL
		135	# undef EV_USE_KQUEUE
		136	#endif
		137
		138	#ifndef CLOCK_MONOTONIC
		139	# undef EV_USE_MONOTONIC
		140	# define EV_USE_MONOTONIC 0
		141	#endif
		142
30	#ifndef HAVE_REALTIME	143	#ifndef CLOCK_REALTIME
31	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	144	# undef EV_USE_REALTIME
		145	# define EV_USE_REALTIME 0
32	#endif	146	#endif
		147
		148	#if EV_SELECT_IS_WINSOCKET
		149	# include <winsock.h>
		150	#endif
		151
		152	/**/
33		153
34	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	154	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
35	#define MAX_BLOCKTIME 60.	155	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		156	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		157	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
36		158
		159	#ifdef EV_H
		160	# include EV_H
		161	#else
37	#include "ev.h"	162	# include "ev.h"
		163	#endif
		164
		165	#if __GNUC__ >= 3
		166	# define expect(expr,value) __builtin_expect ((expr),(value))
		167	# define inline static inline
		168	#else
		169	# define expect(expr,value) (expr)
		170	# define inline static
		171	#endif
		172
		173	#define expect_false(expr) expect ((expr) != 0, 0)
		174	#define expect_true(expr) expect ((expr) != 0, 1)
		175
		176	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		177	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		178
		179	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		180	#define EMPTY2(a,b) /* used to suppress some warnings */
38		181
39	typedef struct ev_watcher *W;	182	typedef struct ev_watcher *W;
40	typedef struct ev_watcher_list *WL;	183	typedef struct ev_watcher_list *WL;
41	typedef struct ev_watcher_time *WT;	184	typedef struct ev_watcher_time *WT;
42		185
43	static ev_tstamp now, diff; /* monotonic clock */	186	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		187
		188	#ifdef _WIN32
		189	# include "ev_win32.c"
		190	#endif
		191
		192	/*****************************************************************************/
		193
		194	static void (*syserr_cb)(const char *msg);
		195
		196	void ev_set_syserr_cb (void (*cb)(const char *msg))
		197	{
		198	syserr_cb = cb;
		199	}
		200
		201	static void
		202	syserr (const char *msg)
		203	{
		204	if (!msg)
		205	msg = "(libev) system error";
		206
		207	if (syserr_cb)
		208	syserr_cb (msg);
		209	else
		210	{
		211	perror (msg);
		212	abort ();
		213	}
		214	}
		215
		216	static void *(*alloc)(void *ptr, long size);
		217
		218	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		219	{
		220	alloc = cb;
		221	}
		222
		223	static void *
		224	ev_realloc (void *ptr, long size)
		225	{
		226	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		227
		228	if (!ptr && size)
		229	{
		230	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		231	abort ();
		232	}
		233
		234	return ptr;
		235	}
		236
		237	#define ev_malloc(size) ev_realloc (0, (size))
		238	#define ev_free(ptr) ev_realloc ((ptr), 0)
		239
		240	/*****************************************************************************/
		241
		242	typedef struct
		243	{
		244	WL head;
		245	unsigned char events;
		246	unsigned char reify;
		247	#if EV_SELECT_IS_WINSOCKET
		248	SOCKET handle;
		249	#endif
		250	} ANFD;
		251
		252	typedef struct
		253	{
		254	W w;
		255	int events;
		256	} ANPENDING;
		257
		258	#if EV_MULTIPLICITY
		259
		260	struct ev_loop
		261	{
		262	ev_tstamp ev_rt_now;
		263	#define ev_rt_now ((loop)->ev_rt_now)
		264	#define VAR(name,decl) decl;
		265	#include "ev_vars.h"
		266	#undef VAR
		267	};
		268	#include "ev_wrap.h"
		269
		270	static struct ev_loop default_loop_struct;
		271	struct ev_loop *ev_default_loop_ptr;
		272
		273	#else
		274
44	ev_tstamp ev_now;	275	ev_tstamp ev_rt_now;
45	int ev_method;	276	#define VAR(name,decl) static decl;
		277	#include "ev_vars.h"
		278	#undef VAR
46		279
47	static int have_monotonic; /* runtime */	280	static int ev_default_loop_ptr;
48		281
49	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	282	#endif
50	static void (*method_modify)(int fd, int oev, int nev);
51	static void (*method_poll)(ev_tstamp timeout);
52		283
53	/*****************************************************************************/	284	/*****************************************************************************/
54		285
55	ev_tstamp	286	ev_tstamp
56	ev_time (void)	287	ev_time (void)
57	{	288	{
58	#if HAVE_REALTIME	289	#if EV_USE_REALTIME
59	struct timespec ts;	290	struct timespec ts;
60	clock_gettime (CLOCK_REALTIME, &ts);	291	clock_gettime (CLOCK_REALTIME, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	292	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	#else	293	#else
63	struct timeval tv;	294	struct timeval tv;
64	gettimeofday (&tv, 0);	295	gettimeofday (&tv, 0);
65	return tv.tv_sec + tv.tv_usec * 1e-6;	296	return tv.tv_sec + tv.tv_usec * 1e-6;
66	#endif	297	#endif
67	}	298	}
68		299
69	static ev_tstamp	300	inline ev_tstamp
70	get_clock (void)	301	get_clock (void)
71	{	302	{
72	#if HAVE_MONOTONIC	303	#if EV_USE_MONOTONIC
73	if (have_monotonic)	304	if (expect_true (have_monotonic))
74	{	305	{
75	struct timespec ts;	306	struct timespec ts;
76	clock_gettime (CLOCK_MONOTONIC, &ts);	307	clock_gettime (CLOCK_MONOTONIC, &ts);
77	return ts.tv_sec + ts.tv_nsec * 1e-9;	308	return ts.tv_sec + ts.tv_nsec * 1e-9;
78	}	309	}
79	#endif	310	#endif
80		311
81	return ev_time ();	312	return ev_time ();
82	}	313	}
83		314
		315	#if EV_MULTIPLICITY
		316	ev_tstamp
		317	ev_now (EV_P)
		318	{
		319	return ev_rt_now;
		320	}
		321	#endif
		322
		323	#define array_roundsize(type,n) (((n) | 4) & ~3)
		324
84	#define array_needsize(base,cur,cnt,init) \	325	#define array_needsize(type,base,cur,cnt,init) \
85	if ((cnt) > cur) \	326	if (expect_false ((cnt) > cur)) \
86	{ \	327	{ \
87	int newcnt = cur ? cur << 1 : 16; \	328	int newcnt = cur; \
88	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	329	do \
		330	{ \
		331	newcnt = array_roundsize (type, newcnt << 1); \
		332	} \
		333	while ((cnt) > newcnt); \
		334	\
89	base = realloc (base, sizeof (*base) * (newcnt)); \	335	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
90	init (base + cur, newcnt - cur); \	336	init (base + cur, newcnt - cur); \
91	cur = newcnt; \	337	cur = newcnt; \
92	}	338	}
		339
		340	#define array_slim(type,stem) \
		341	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		342	{ \
		343	stem ## max = array_roundsize (stem ## cnt >> 1); \
		344	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		345	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		346	}
		347
		348	#define array_free(stem, idx) \
		349	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
93		350
94	/*****************************************************************************/	351	/*****************************************************************************/
95		352
96	typedef struct
97	{
98	struct ev_io *head;
99	unsigned char wev, rev; /* want, received event set */
100	} ANFD;
101
102	static ANFD *anfds;
103	static int anfdmax;
104
105	static int *fdchanges;
106	static int fdchangemax, fdchangecnt;
107
108	static void	353	static void
109	anfds_init (ANFD *base, int count)	354	anfds_init (ANFD *base, int count)
110	{	355	{
111	while (count--)	356	while (count--)
112	{	357	{
113	base->head = 0;	358	base->head = 0;
114	base->wev = base->rev = EV_NONE;	359	base->events = EV_NONE;
		360	base->reify = 0;
		361
115	++base;	362	++base;
116	}	363	}
117	}	364	}
118		365
119	typedef struct	366	void
		367	ev_feed_event (EV_P_ void *w, int revents)
120	{	368	{
121	W w;	369	W w_ = (W)w;
122	int events;
123	} ANPENDING;
124		370
125	static ANPENDING *pendings;	371	if (expect_false (w_->pending))
126	static int pendingmax, pendingcnt;	372	{
		373	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		374	return;
		375	}
127		376
128	static void
129	event (W w, int events)
130	{
131	w->pending = ++pendingcnt;	377	w_->pending = ++pendingcnt [ABSPRI (w_)];
132	array_needsize (pendings, pendingmax, pendingcnt, );	378	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
133	pendings [pendingcnt - 1].w = w;	379	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
134	pendings [pendingcnt - 1].events = events;	380	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
135	}	381	}
136		382
137	static void	383	static void
		384	queue_events (EV_P_ W *events, int eventcnt, int type)
		385	{
		386	int i;
		387
		388	for (i = 0; i < eventcnt; ++i)
		389	ev_feed_event (EV_A_ events [i], type);
		390	}
		391
		392	inline void
138	fd_event (int fd, int events)	393	fd_event (EV_P_ int fd, int revents)
139	{	394	{
140	ANFD *anfd = anfds + fd;	395	ANFD *anfd = anfds + fd;
141	struct ev_io *w;	396	struct ev_io *w;
142		397
143	for (w = anfd->head; w; w = w->next)	398	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
144	{	399	{
145	int ev = w->events & events;	400	int ev = w->events & revents;
146		401
147	if (ev)	402	if (ev)
148	event ((W)w, ev);	403	ev_feed_event (EV_A_ (W)w, ev);
149	}	404	}
150	}	405	}
151		406
152	static void	407	void
153	queue_events (W *events, int eventcnt, int type)	408	ev_feed_fd_event (EV_P_ int fd, int revents)
154	{	409	{
155	int i;	410	fd_event (EV_A_ fd, revents);
156
157	for (i = 0; i < eventcnt; ++i)
158	event (events [i], type);
159	}	411	}
160		412
161	/*****************************************************************************/	413	/*****************************************************************************/
162		414
163	static struct ev_timer **timers;	415	inline void
164	static int timermax, timercnt;	416	fd_reify (EV_P)
165
166	static struct ev_periodic **periodics;
167	static int periodicmax, periodiccnt;
168
169	static void
170	upheap (WT *timers, int k)
171	{
172	WT w = timers [k];
173
174	while (k && timers [k >> 1]->at > w->at)
175	{
176	timers [k] = timers [k >> 1];
177	timers [k]->active = k + 1;
178	k >>= 1;
179	}
180
181	timers [k] = w;
182	timers [k]->active = k + 1;
183
184	}
185
186	static void
187	downheap (WT *timers, int N, int k)
188	{
189	WT w = timers [k];
190
191	while (k < (N >> 1))
192	{
193	int j = k << 1;
194
195	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
196	++j;
197
198	if (w->at <= timers [j]->at)
199	break;
200
201	timers [k] = timers [j];
202	timers [k]->active = k + 1;
203	k = j;
204	}
205
206	timers [k] = w;
207	timers [k]->active = k + 1;
208	}
209
210	/*****************************************************************************/
211
212	typedef struct
213	{
214	struct ev_signal *head;
215	sig_atomic_t gotsig;
216	} ANSIG;
217
218	static ANSIG *signals;
219	static int signalmax;
220
221	static int sigpipe [2];
222	static sig_atomic_t gotsig;
223	static struct ev_io sigev;
224
225	static void
226	signals_init (ANSIG *base, int count)
227	{
228	while (count--)
229	{
230	base->head = 0;
231	base->gotsig = 0;
232	++base;
233	}
234	}
235
236	static void
237	sighandler (int signum)
238	{
239	signals [signum - 1].gotsig = 1;
240
241	if (!gotsig)
242	{
243	gotsig = 1;
244	write (sigpipe [1], &gotsig, 1);
245	}
246	}
247
248	static void
249	sigcb (struct ev_io *iow, int revents)
250	{
251	struct ev_signal *w;
252	int sig;
253
254	gotsig = 0;
255	read (sigpipe [0], &revents, 1);
256
257	for (sig = signalmax; sig--; )
258	if (signals [sig].gotsig)
259	{
260	signals [sig].gotsig = 0;
261
262	for (w = signals [sig].head; w; w = w->next)
263	event ((W)w, EV_SIGNAL);
264	}
265	}
266
267	static void
268	siginit (void)
269	{
270	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
271	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
272
273	/* rather than sort out wether we really need nb, set it */
274	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
275	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
276
277	evio_set (&sigev, sigpipe [0], EV_READ);
278	evio_start (&sigev);
279	}
280
281	/*****************************************************************************/
282
283	static struct ev_idle **idles;
284	static int idlemax, idlecnt;
285
286	static struct ev_check **checks;
287	static int checkmax, checkcnt;
288
289	/*****************************************************************************/
290
291	#if HAVE_EPOLL
292	# include "ev_epoll.c"
293	#endif
294	#if HAVE_SELECT
295	# include "ev_select.c"
296	#endif
297
298	int ev_init (int flags)
299	{
300	#if HAVE_MONOTONIC
301	{
302	struct timespec ts;
303	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
304	have_monotonic = 1;
305	}
306	#endif
307
308	ev_now = ev_time ();
309	now = get_clock ();
310	diff = ev_now - now;
311
312	if (pipe (sigpipe))
313	return 0;
314
315	ev_method = EVMETHOD_NONE;
316	#if HAVE_EPOLL
317	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
318	#endif
319	#if HAVE_SELECT
320	if (ev_method == EVMETHOD_NONE) select_init (flags);
321	#endif
322
323	if (ev_method)
324	{
325	evw_init (&sigev, sigcb);
326	siginit ();
327	}
328
329	return ev_method;
330	}
331
332	/*****************************************************************************/
333
334	void ev_prefork (void)
335	{
336	/* nop */
337	}
338
339	void ev_postfork_parent (void)
340	{
341	/* nop */
342	}
343
344	void ev_postfork_child (void)
345	{
346	#if HAVE_EPOLL
347	if (ev_method == EVMETHOD_EPOLL)
348	epoll_postfork_child ();
349	#endif
350
351	evio_stop (&sigev);
352	close (sigpipe [0]);
353	close (sigpipe [1]);
354	pipe (sigpipe);
355	siginit ();
356	}
357
358	/*****************************************************************************/
359
360	static void
361	fd_reify (void)
362	{	417	{
363	int i;	418	int i;
364		419
365	for (i = 0; i < fdchangecnt; ++i)	420	for (i = 0; i < fdchangecnt; ++i)
366	{	421	{
367	int fd = fdchanges [i];	422	int fd = fdchanges [i];
368	ANFD *anfd = anfds + fd;	423	ANFD *anfd = anfds + fd;
369	struct ev_io *w;	424	struct ev_io *w;
370		425
371	int wev = 0;	426	int events = 0;
372		427
373	for (w = anfd->head; w; w = w->next)	428	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
374	wev |= w->events;	429	events |= w->events;
375		430
376	if (anfd->wev != wev)	431	#if EV_SELECT_IS_WINSOCKET
		432	if (events)
377	{	433	{
378	method_modify (fd, anfd->wev, wev);	434	unsigned long argp;
379	anfd->wev = wev;	435	anfd->handle = _get_osfhandle (fd);
		436	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
380	}	437	}
		438	#endif
		439
		440	anfd->reify = 0;
		441
		442	method_modify (EV_A_ fd, anfd->events, events);
		443	anfd->events = events;
381	}	444	}
382		445
383	fdchangecnt = 0;	446	fdchangecnt = 0;
384	}	447	}
385		448
386	static void	449	static void
387	call_pending ()	450	fd_change (EV_P_ int fd)
		451	{
		452	if (expect_false (anfds [fd].reify))
		453	return;
		454
		455	anfds [fd].reify = 1;
		456
		457	++fdchangecnt;
		458	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		459	fdchanges [fdchangecnt - 1] = fd;
		460	}
		461
		462	static void
		463	fd_kill (EV_P_ int fd)
		464	{
		465	struct ev_io *w;
		466
		467	while ((w = (struct ev_io *)anfds [fd].head))
		468	{
		469	ev_io_stop (EV_A_ w);
		470	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		471	}
		472	}
		473
		474	inline int
		475	fd_valid (int fd)
		476	{
		477	#ifdef _WIN32
		478	return _get_osfhandle (fd) != -1;
		479	#else
		480	return fcntl (fd, F_GETFD) != -1;
		481	#endif
		482	}
		483
		484	/* called on EBADF to verify fds */
		485	static void
		486	fd_ebadf (EV_P)
		487	{
		488	int fd;
		489
		490	for (fd = 0; fd < anfdmax; ++fd)
		491	if (anfds [fd].events)
		492	if (!fd_valid (fd) == -1 && errno == EBADF)
		493	fd_kill (EV_A_ fd);
		494	}
		495
		496	/* called on ENOMEM in select/poll to kill some fds and retry */
		497	static void
		498	fd_enomem (EV_P)
		499	{
		500	int fd;
		501
		502	for (fd = anfdmax; fd--; )
		503	if (anfds [fd].events)
		504	{
		505	fd_kill (EV_A_ fd);
		506	return;
		507	}
		508	}
		509
		510	/* usually called after fork if method needs to re-arm all fds from scratch */
		511	static void
		512	fd_rearm_all (EV_P)
		513	{
		514	int fd;
		515
		516	/* this should be highly optimised to not do anything but set a flag */
		517	for (fd = 0; fd < anfdmax; ++fd)
		518	if (anfds [fd].events)
		519	{
		520	anfds [fd].events = 0;
		521	fd_change (EV_A_ fd);
		522	}
		523	}
		524
		525	/*****************************************************************************/
		526
		527	static void
		528	upheap (WT *heap, int k)
		529	{
		530	WT w = heap [k];
		531
		532	while (k && heap [k >> 1]->at > w->at)
		533	{
		534	heap [k] = heap [k >> 1];
		535	((W)heap [k])->active = k + 1;
		536	k >>= 1;
		537	}
		538
		539	heap [k] = w;
		540	((W)heap [k])->active = k + 1;
		541
		542	}
		543
		544	static void
		545	downheap (WT *heap, int N, int k)
		546	{
		547	WT w = heap [k];
		548
		549	while (k < (N >> 1))
		550	{
		551	int j = k << 1;
		552
		553	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		554	++j;
		555
		556	if (w->at <= heap [j]->at)
		557	break;
		558
		559	heap [k] = heap [j];
		560	((W)heap [k])->active = k + 1;
		561	k = j;
		562	}
		563
		564	heap [k] = w;
		565	((W)heap [k])->active = k + 1;
		566	}
		567
		568	inline void
		569	adjustheap (WT *heap, int N, int k)
		570	{
		571	upheap (heap, k);
		572	downheap (heap, N, k);
		573	}
		574
		575	/*****************************************************************************/
		576
		577	typedef struct
		578	{
		579	WL head;
		580	sig_atomic_t volatile gotsig;
		581	} ANSIG;
		582
		583	static ANSIG *signals;
		584	static int signalmax;
		585
		586	static int sigpipe [2];
		587	static sig_atomic_t volatile gotsig;
		588	static struct ev_io sigev;
		589
		590	static void
		591	signals_init (ANSIG *base, int count)
		592	{
		593	while (count--)
		594	{
		595	base->head = 0;
		596	base->gotsig = 0;
		597
		598	++base;
		599	}
		600	}
		601
		602	static void
		603	sighandler (int signum)
		604	{
		605	#if _WIN32
		606	signal (signum, sighandler);
		607	#endif
		608
		609	signals [signum - 1].gotsig = 1;
		610
		611	if (!gotsig)
		612	{
		613	int old_errno = errno;
		614	gotsig = 1;
		615	write (sigpipe [1], &signum, 1);
		616	errno = old_errno;
		617	}
		618	}
		619
		620	void
		621	ev_feed_signal_event (EV_P_ int signum)
		622	{
		623	WL w;
		624
		625	#if EV_MULTIPLICITY
		626	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		627	#endif
		628
		629	--signum;
		630
		631	if (signum < 0 || signum >= signalmax)
		632	return;
		633
		634	signals [signum].gotsig = 0;
		635
		636	for (w = signals [signum].head; w; w = w->next)
		637	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		638	}
		639
		640	static void
		641	sigcb (EV_P_ struct ev_io *iow, int revents)
		642	{
		643	int signum;
		644
		645	read (sigpipe [0], &revents, 1);
		646	gotsig = 0;
		647
		648	for (signum = signalmax; signum--; )
		649	if (signals [signum].gotsig)
		650	ev_feed_signal_event (EV_A_ signum + 1);
		651	}
		652
		653	static void
		654	fd_intern (int fd)
		655	{
		656	#ifdef _WIN32
		657	int arg = 1;
		658	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		659	#else
		660	fcntl (fd, F_SETFD, FD_CLOEXEC);
		661	fcntl (fd, F_SETFL, O_NONBLOCK);
		662	#endif
		663	}
		664
		665	static void
		666	siginit (EV_P)
		667	{
		668	fd_intern (sigpipe [0]);
		669	fd_intern (sigpipe [1]);
		670
		671	ev_io_set (&sigev, sigpipe [0], EV_READ);
		672	ev_io_start (EV_A_ &sigev);
		673	ev_unref (EV_A); /* child watcher should not keep loop alive */
		674	}
		675
		676	/*****************************************************************************/
		677
		678	static struct ev_child *childs [PID_HASHSIZE];
		679
		680	#ifndef _WIN32
		681
		682	static struct ev_signal childev;
		683
		684	#ifndef WCONTINUED
		685	# define WCONTINUED 0
		686	#endif
		687
		688	static void
		689	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		690	{
		691	struct ev_child *w;
		692
		693	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		694	if (w->pid == pid || !w->pid)
		695	{
		696	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		697	w->rpid = pid;
		698	w->rstatus = status;
		699	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		700	}
		701	}
		702
		703	static void
		704	childcb (EV_P_ struct ev_signal *sw, int revents)
		705	{
		706	int pid, status;
		707
		708	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		709	{
		710	/* make sure we are called again until all childs have been reaped */
		711	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		712
		713	child_reap (EV_A_ sw, pid, pid, status);
		714	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		715	}
		716	}
		717
		718	#endif
		719
		720	/*****************************************************************************/
		721
		722	#if EV_USE_PORT
		723	# include "ev_port.c"
		724	#endif
		725	#if EV_USE_KQUEUE
		726	# include "ev_kqueue.c"
		727	#endif
		728	#if EV_USE_EPOLL
		729	# include "ev_epoll.c"
		730	#endif
		731	#if EV_USE_POLL
		732	# include "ev_poll.c"
		733	#endif
		734	#if EV_USE_SELECT
		735	# include "ev_select.c"
		736	#endif
		737
		738	int
		739	ev_version_major (void)
		740	{
		741	return EV_VERSION_MAJOR;
		742	}
		743
		744	int
		745	ev_version_minor (void)
		746	{
		747	return EV_VERSION_MINOR;
		748	}
		749
		750	/* return true if we are running with elevated privileges and should ignore env variables */
		751	static int
		752	enable_secure (void)
		753	{
		754	#ifdef _WIN32
		755	return 0;
		756	#else
		757	return getuid () != geteuid ()
		758	|| getgid () != getegid ();
		759	#endif
		760	}
		761
		762	unsigned int
		763	ev_method (EV_P)
		764	{
		765	return method;
		766	}
		767
		768	static void
		769	loop_init (EV_P_ unsigned int flags)
		770	{
		771	if (!method)
		772	{
		773	#if EV_USE_MONOTONIC
		774	{
		775	struct timespec ts;
		776	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		777	have_monotonic = 1;
		778	}
		779	#endif
		780
		781	ev_rt_now = ev_time ();
		782	mn_now = get_clock ();
		783	now_floor = mn_now;
		784	rtmn_diff = ev_rt_now - mn_now;
		785
		786	if (!(flags & EVFLAG_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		787	flags = atoi (getenv ("LIBEV_FLAGS"));
		788
		789	if (!(flags & 0x0000ffff))
		790	flags |= 0x0000ffff;
		791
		792	method = 0;
		793	#if EV_USE_PORT
		794	if (!method && (flags & EVMETHOD_PORT )) method = port_init (EV_A_ flags);
		795	#endif
		796	#if EV_USE_KQUEUE
		797	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		798	#endif
		799	#if EV_USE_EPOLL
		800	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
		801	#endif
		802	#if EV_USE_POLL
		803	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		804	#endif
		805	#if EV_USE_SELECT
		806	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
		807	#endif
		808
		809	ev_init (&sigev, sigcb);
		810	ev_set_priority (&sigev, EV_MAXPRI);
		811	}
		812	}
		813
		814	static void
		815	loop_destroy (EV_P)
388	{	816	{
389	int i;	817	int i;
390		818
391	for (i = 0; i < pendingcnt; ++i)	819	#if EV_USE_PORT
		820	if (method == EVMETHOD_PORT ) port_destroy (EV_A);
		821	#endif
		822	#if EV_USE_KQUEUE
		823	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		824	#endif
		825	#if EV_USE_EPOLL
		826	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		827	#endif
		828	#if EV_USE_POLL
		829	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		830	#endif
		831	#if EV_USE_SELECT
		832	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		833	#endif
		834
		835	for (i = NUMPRI; i--; )
		836	array_free (pending, [i]);
		837
		838	/* have to use the microsoft-never-gets-it-right macro */
		839	array_free (fdchange, EMPTY0);
		840	array_free (timer, EMPTY0);
		841	#if EV_PERIODICS
		842	array_free (periodic, EMPTY0);
		843	#endif
		844	array_free (idle, EMPTY0);
		845	array_free (prepare, EMPTY0);
		846	array_free (check, EMPTY0);
		847
		848	method = 0;
		849	}
		850
		851	static void
		852	loop_fork (EV_P)
		853	{
		854	#if EV_USE_PORT
		855	if (method == EVMETHOD_PORT ) port_fork (EV_A);
		856	#endif
		857	#if EV_USE_KQUEUE
		858	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		859	#endif
		860	#if EV_USE_EPOLL
		861	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		862	#endif
		863
		864	if (ev_is_active (&sigev))
		865	{
		866	/* default loop */
		867
		868	ev_ref (EV_A);
		869	ev_io_stop (EV_A_ &sigev);
		870	close (sigpipe [0]);
		871	close (sigpipe [1]);
		872
		873	while (pipe (sigpipe))
		874	syserr ("(libev) error creating pipe");
		875
		876	siginit (EV_A);
392	{	877	}
393	ANPENDING *p = pendings + i;
394		878
395	if (p->w)	879	postfork = 0;
		880	}
		881
		882	#if EV_MULTIPLICITY
		883	struct ev_loop *
		884	ev_loop_new (unsigned int flags)
		885	{
		886	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		887
		888	memset (loop, 0, sizeof (struct ev_loop));
		889
		890	loop_init (EV_A_ flags);
		891
		892	if (ev_method (EV_A))
		893	return loop;
		894
		895	return 0;
		896	}
		897
		898	void
		899	ev_loop_destroy (EV_P)
		900	{
		901	loop_destroy (EV_A);
		902	ev_free (loop);
		903	}
		904
		905	void
		906	ev_loop_fork (EV_P)
		907	{
		908	postfork = 1;
		909	}
		910
		911	#endif
		912
		913	#if EV_MULTIPLICITY
		914	struct ev_loop *
		915	ev_default_loop_ (unsigned int flags)
		916	#else
		917	int
		918	ev_default_loop (unsigned int flags)
		919	#endif
		920	{
		921	if (sigpipe [0] == sigpipe [1])
		922	if (pipe (sigpipe))
		923	return 0;
		924
		925	if (!ev_default_loop_ptr)
		926	{
		927	#if EV_MULTIPLICITY
		928	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		929	#else
		930	ev_default_loop_ptr = 1;
		931	#endif
		932
		933	loop_init (EV_A_ flags);
		934
		935	if (ev_method (EV_A))
396	{	936	{
397	p->w->pending = 0;	937	siginit (EV_A);
398	p->w->cb (p->w, p->events);	938
		939	#ifndef _WIN32
		940	ev_signal_init (&childev, childcb, SIGCHLD);
		941	ev_set_priority (&childev, EV_MAXPRI);
		942	ev_signal_start (EV_A_ &childev);
		943	ev_unref (EV_A); /* child watcher should not keep loop alive */
		944	#endif
399	}	945	}
		946	else
		947	ev_default_loop_ptr = 0;
		948	}
		949
		950	return ev_default_loop_ptr;
		951	}
		952
		953	void
		954	ev_default_destroy (void)
		955	{
		956	#if EV_MULTIPLICITY
		957	struct ev_loop *loop = ev_default_loop_ptr;
		958	#endif
		959
		960	#ifndef _WIN32
		961	ev_ref (EV_A); /* child watcher */
		962	ev_signal_stop (EV_A_ &childev);
		963	#endif
		964
		965	ev_ref (EV_A); /* signal watcher */
		966	ev_io_stop (EV_A_ &sigev);
		967
		968	close (sigpipe [0]); sigpipe [0] = 0;
		969	close (sigpipe [1]); sigpipe [1] = 0;
		970
		971	loop_destroy (EV_A);
		972	}
		973
		974	void
		975	ev_default_fork (void)
		976	{
		977	#if EV_MULTIPLICITY
		978	struct ev_loop *loop = ev_default_loop_ptr;
		979	#endif
		980
		981	if (method)
		982	postfork = 1;
		983	}
		984
		985	/*****************************************************************************/
		986
		987	static int
		988	any_pending (EV_P)
		989	{
		990	int pri;
		991
		992	for (pri = NUMPRI; pri--; )
		993	if (pendingcnt [pri])
		994	return 1;
		995
		996	return 0;
		997	}
		998
		999	inline void
		1000	call_pending (EV_P)
		1001	{
		1002	int pri;
		1003
		1004	for (pri = NUMPRI; pri--; )
		1005	while (pendingcnt [pri])
		1006	{
		1007	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1008
		1009	if (expect_true (p->w))
		1010	{
		1011	p->w->pending = 0;
		1012	EV_CB_INVOKE (p->w, p->events);
		1013	}
400	}	1014	}
401
402	pendingcnt = 0;
403	}	1015	}
404		1016
405	static void	1017	inline void
406	timers_reify ()	1018	timers_reify (EV_P)
407	{	1019	{
408	while (timercnt && timers [0]->at <= now)	1020	while (timercnt && ((WT)timers [0])->at <= mn_now)
409	{	1021	{
410	struct ev_timer *w = timers [0];	1022	struct ev_timer *w = timers [0];
		1023
		1024	assert (("inactive timer on timer heap detected", ev_is_active (w)));
411		1025
412	/* first reschedule or stop timer */	1026	/* first reschedule or stop timer */
413	if (w->repeat)	1027	if (w->repeat)
414	{	1028	{
		1029	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		1030
415	w->at = now + w->repeat;	1031	((WT)w)->at += w->repeat;
416	assert (("timer timeout in the past, negative repeat?", w->at > now));	1032	if (((WT)w)->at < mn_now)
		1033	((WT)w)->at = mn_now;
		1034
417	downheap ((WT *)timers, timercnt, 0);	1035	downheap ((WT *)timers, timercnt, 0);
418	}	1036	}
419	else	1037	else
420	evtimer_stop (w); /* nonrepeating: stop timer */	1038	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
421		1039
422	event ((W)w, EV_TIMEOUT);	1040	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
423	}	1041	}
424	}	1042	}
425		1043
426	static void	1044	#if EV_PERIODICS
		1045	inline void
427	periodics_reify ()	1046	periodics_reify (EV_P)
428	{	1047	{
429	while (periodiccnt && periodics [0]->at <= ev_now)	1048	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
430	{	1049	{
431	struct ev_periodic *w = periodics [0];	1050	struct ev_periodic *w = periodics [0];
432		1051
		1052	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1053
433	/* first reschedule or stop timer */	1054	/* first reschedule or stop timer */
434	if (w->interval)	1055	if (w->reschedule_cb)
435	{	1056	{
		1057	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1058	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1059	downheap ((WT *)periodics, periodiccnt, 0);
		1060	}
		1061	else if (w->interval)
		1062	{
436	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1063	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
437	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1064	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
438	downheap ((WT *)periodics, periodiccnt, 0);	1065	downheap ((WT *)periodics, periodiccnt, 0);
439	}	1066	}
440	else	1067	else
441	evperiodic_stop (w); /* nonrepeating: stop timer */	1068	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
442		1069
443	event ((W)w, EV_TIMEOUT);	1070	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
444	}	1071	}
445	}	1072	}
446		1073
447	static void	1074	static void
448	periodics_reschedule (ev_tstamp diff)	1075	periodics_reschedule (EV_P)
449	{	1076	{
450	int i;	1077	int i;
451		1078
452	/* adjust periodics after time jump */	1079	/* adjust periodics after time jump */
453	for (i = 0; i < periodiccnt; ++i)	1080	for (i = 0; i < periodiccnt; ++i)
454	{	1081	{
455	struct ev_periodic *w = periodics [i];	1082	struct ev_periodic *w = periodics [i];
456		1083
		1084	if (w->reschedule_cb)
		1085	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
457	if (w->interval)	1086	else if (w->interval)
		1087	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1088	}
		1089
		1090	/* now rebuild the heap */
		1091	for (i = periodiccnt >> 1; i--; )
		1092	downheap ((WT *)periodics, periodiccnt, i);
		1093	}
		1094	#endif
		1095
		1096	inline int
		1097	time_update_monotonic (EV_P)
		1098	{
		1099	mn_now = get_clock ();
		1100
		1101	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1102	{
		1103	ev_rt_now = rtmn_diff + mn_now;
		1104	return 0;
		1105	}
		1106	else
		1107	{
		1108	now_floor = mn_now;
		1109	ev_rt_now = ev_time ();
		1110	return 1;
		1111	}
		1112	}
		1113
		1114	inline void
		1115	time_update (EV_P)
		1116	{
		1117	int i;
		1118
		1119	#if EV_USE_MONOTONIC
		1120	if (expect_true (have_monotonic))
		1121	{
		1122	if (time_update_monotonic (EV_A))
458	{	1123	{
459	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1124	ev_tstamp odiff = rtmn_diff;
460		1125
461	if (fabs (diff) >= 1e-4)	1126	for (i = 4; --i; ) /* loop a few times, before making important decisions */
462	{	1127	{
463	evperiodic_stop (w);	1128	rtmn_diff = ev_rt_now - mn_now;
464	evperiodic_start (w);
465		1129
466	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1130	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1131	return; /* all is well */
		1132
		1133	ev_rt_now = ev_time ();
		1134	mn_now = get_clock ();
		1135	now_floor = mn_now;
467	}	1136	}
		1137
		1138	# if EV_PERIODICS
		1139	periodics_reschedule (EV_A);
		1140	# endif
		1141	/* no timer adjustment, as the monotonic clock doesn't jump */
		1142	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
468	}	1143	}
469	}	1144	}
470	}	1145	else
471		1146	#endif
472	static void	1147	{
473	time_update ()
474	{
475	int i;
476
477	ev_now = ev_time ();	1148	ev_rt_now = ev_time ();
478		1149
479	if (have_monotonic)	1150	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
480	{
481	ev_tstamp odiff = diff;
482
483	for (i = 4; --i; ) /* loop a few times, before making important decisions */
484	{	1151	{
485	now = get_clock ();	1152	#if EV_PERIODICS
486	diff = ev_now - now;
487
488	if (fabs (odiff - diff) < MIN_TIMEJUMP)
489	return; /* all is well */
490
491	ev_now = ev_time ();
492	}
493
494	periodics_reschedule (diff - odiff);
495	/* no timer adjustment, as the monotonic clock doesn't jump */
496	}
497	else
498	{
499	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
500	{
501	periodics_reschedule (ev_now - now);	1153	periodics_reschedule (EV_A);
		1154	#endif
502		1155
503	/* adjust timers. this is easy, as the offset is the same for all */	1156	/* adjust timers. this is easy, as the offset is the same for all */
504	for (i = 0; i < timercnt; ++i)	1157	for (i = 0; i < timercnt; ++i)
505	timers [i]->at += diff;	1158	((WT)timers [i])->at += ev_rt_now - mn_now;
506	}	1159	}
507		1160
508	now = ev_now;	1161	mn_now = ev_rt_now;
509	}	1162	}
510	}	1163	}
511		1164
512	int ev_loop_done;	1165	void
		1166	ev_ref (EV_P)
		1167	{
		1168	++activecnt;
		1169	}
513		1170
		1171	void
		1172	ev_unref (EV_P)
		1173	{
		1174	--activecnt;
		1175	}
		1176
		1177	static int loop_done;
		1178
		1179	void
514	void ev_loop (int flags)	1180	ev_loop (EV_P_ int flags)
515	{	1181	{
516	double block;	1182	double block;
517	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1183	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
518		1184
519	if (checkcnt)	1185	while (activecnt)
520	{	1186	{
521	queue_events ((W *)checks, checkcnt, EV_CHECK);	1187	/* queue check watchers (and execute them) */
		1188	if (expect_false (preparecnt))
		1189	{
		1190	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
522	call_pending ();	1191	call_pending (EV_A);
523	}	1192	}
524		1193
525	do	1194	/* we might have forked, so reify kernel state if necessary */
526	{	1195	if (expect_false (postfork))
		1196	loop_fork (EV_A);
		1197
527	/* update fd-related kernel structures */	1198	/* update fd-related kernel structures */
528	fd_reify ();	1199	fd_reify (EV_A);
529		1200
530	/* calculate blocking time */	1201	/* calculate blocking time */
531		1202
532	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1203	/* we only need this for !monotonic clock or timers, but as we basically
		1204	always have timers, we just calculate it always */
		1205	#if EV_USE_MONOTONIC
		1206	if (expect_true (have_monotonic))
		1207	time_update_monotonic (EV_A);
		1208	else
		1209	#endif
		1210	{
533	ev_now = ev_time ();	1211	ev_rt_now = ev_time ();
		1212	mn_now = ev_rt_now;
		1213	}
534		1214
535	if (flags & EVLOOP_NONBLOCK || idlecnt)	1215	if (flags & EVLOOP_NONBLOCK || idlecnt)
536	block = 0.;	1216	block = 0.;
537	else	1217	else
538	{	1218	{
539	block = MAX_BLOCKTIME;	1219	block = MAX_BLOCKTIME;
540		1220
541	if (timercnt)	1221	if (timercnt)
542	{	1222	{
543	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1223	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
544	if (block > to) block = to;	1224	if (block > to) block = to;
545	}	1225	}
546		1226
		1227	#if EV_PERIODICS
547	if (periodiccnt)	1228	if (periodiccnt)
548	{	1229	{
549	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1230	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
550	if (block > to) block = to;	1231	if (block > to) block = to;
551	}	1232	}
		1233	#endif
552		1234
553	if (block < 0.) block = 0.;	1235	if (expect_false (block < 0.)) block = 0.;
554	}	1236	}
555		1237
556	method_poll (block);	1238	method_poll (EV_A_ block);
557		1239
558	/* update ev_now, do magic */	1240	/* update ev_rt_now, do magic */
559	time_update ();	1241	time_update (EV_A);
560		1242
561	/* queue pending timers and reschedule them */	1243	/* queue pending timers and reschedule them */
		1244	timers_reify (EV_A); /* relative timers called last */
		1245	#if EV_PERIODICS
562	periodics_reify (); /* absolute timers first */	1246	periodics_reify (EV_A); /* absolute timers called first */
563	timers_reify (); /* relative timers second */	1247	#endif
564		1248
565	/* queue idle watchers unless io or timers are pending */	1249	/* queue idle watchers unless io or timers are pending */
566	if (!pendingcnt)	1250	if (idlecnt && !any_pending (EV_A))
567	queue_events ((W *)idles, idlecnt, EV_IDLE);	1251	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
568		1252
569	/* queue check and possibly idle watchers */	1253	/* queue check watchers, to be executed first */
		1254	if (expect_false (checkcnt))
570	queue_events ((W *)checks, checkcnt, EV_CHECK);	1255	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
571		1256
572	call_pending ();	1257	call_pending (EV_A);
573	}
574	while (!ev_loop_done);
575		1258
		1259	if (expect_false (loop_done))
		1260	break;
		1261	}
		1262
576	if (ev_loop_done != 2)	1263	if (loop_done != 2)
577	ev_loop_done = 0;	1264	loop_done = 0;
		1265	}
		1266
		1267	void
		1268	ev_unloop (EV_P_ int how)
		1269	{
		1270	loop_done = how;
578	}	1271	}
579		1272
580	/*****************************************************************************/	1273	/*****************************************************************************/
581		1274
582	static void	1275	inline void
583	wlist_add (WL *head, WL elem)	1276	wlist_add (WL *head, WL elem)
584	{	1277	{
585	elem->next = *head;	1278	elem->next = *head;
586	*head = elem;	1279	*head = elem;
587	}	1280	}
588		1281
589	static void	1282	inline void
590	wlist_del (WL *head, WL elem)	1283	wlist_del (WL *head, WL elem)
591	{	1284	{
592	while (*head)	1285	while (*head)
593	{	1286	{
594	if (*head == elem)	1287	if (*head == elem)
…		…
599		1292
600	head = &(*head)->next;	1293	head = &(*head)->next;
601	}	1294	}
602	}	1295	}
603		1296
604	static void	1297	inline void
		1298	ev_clear_pending (EV_P_ W w)
		1299	{
		1300	if (w->pending)
		1301	{
		1302	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1303	w->pending = 0;
		1304	}
		1305	}
		1306
		1307	inline void
605	ev_start (W w, int active)	1308	ev_start (EV_P_ W w, int active)
606	{	1309	{
607	w->pending = 0;	1310	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1311	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1312
608	w->active = active;	1313	w->active = active;
		1314	ev_ref (EV_A);
609	}	1315	}
610		1316
611	static void	1317	inline void
612	ev_stop (W w)	1318	ev_stop (EV_P_ W w)
613	{	1319	{
614	if (w->pending)	1320	ev_unref (EV_A);
615	pendings [w->pending - 1].w = 0;
616
617	w->active = 0;	1321	w->active = 0;
618	}	1322	}
619		1323
620	/*****************************************************************************/	1324	/*****************************************************************************/
621		1325
622	void	1326	void
623	evio_start (struct ev_io *w)	1327	ev_io_start (EV_P_ struct ev_io *w)
624	{	1328	{
625	if (ev_is_active (w))
626	return;
627
628	int fd = w->fd;	1329	int fd = w->fd;
629		1330
		1331	if (expect_false (ev_is_active (w)))
		1332	return;
		1333
		1334	assert (("ev_io_start called with negative fd", fd >= 0));
		1335
630	ev_start ((W)w, 1);	1336	ev_start (EV_A_ (W)w, 1);
631	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1337	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
632	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1338	wlist_add ((WL *)&anfds[fd].head, (WL)w);
633		1339
634	++fdchangecnt;	1340	fd_change (EV_A_ fd);
635	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
636	fdchanges [fdchangecnt - 1] = fd;
637	}	1341	}
638		1342
639	void	1343	void
640	evio_stop (struct ev_io *w)	1344	ev_io_stop (EV_P_ struct ev_io *w)
641	{	1345	{
		1346	ev_clear_pending (EV_A_ (W)w);
642	if (!ev_is_active (w))	1347	if (expect_false (!ev_is_active (w)))
643	return;	1348	return;
		1349
		1350	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
644		1351
645	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1352	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
646	ev_stop ((W)w);	1353	ev_stop (EV_A_ (W)w);
647		1354
648	++fdchangecnt;	1355	fd_change (EV_A_ w->fd);
649	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
650	fdchanges [fdchangecnt - 1] = w->fd;
651	}	1356	}
652		1357
653
654	void	1358	void
655	evtimer_start (struct ev_timer *w)	1359	ev_timer_start (EV_P_ struct ev_timer *w)
656	{	1360	{
657	if (ev_is_active (w))	1361	if (expect_false (ev_is_active (w)))
658	return;	1362	return;
659		1363
660	w->at += now;	1364	((WT)w)->at += mn_now;
661		1365
662	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1366	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
663		1367
664	ev_start ((W)w, ++timercnt);	1368	ev_start (EV_A_ (W)w, ++timercnt);
665	array_needsize (timers, timermax, timercnt, );	1369	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
666	timers [timercnt - 1] = w;	1370	timers [timercnt - 1] = w;
667	upheap ((WT *)timers, timercnt - 1);	1371	upheap ((WT *)timers, timercnt - 1);
668	}
669		1372
		1373	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1374	}
		1375
670	void	1376	void
671	evtimer_stop (struct ev_timer *w)	1377	ev_timer_stop (EV_P_ struct ev_timer *w)
672	{	1378	{
		1379	ev_clear_pending (EV_A_ (W)w);
673	if (!ev_is_active (w))	1380	if (expect_false (!ev_is_active (w)))
674	return;	1381	return;
675		1382
		1383	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1384
676	if (w->active < timercnt--)	1385	if (expect_true (((W)w)->active < timercnt--))
677	{	1386	{
678	timers [w->active - 1] = timers [timercnt];	1387	timers [((W)w)->active - 1] = timers [timercnt];
679	downheap ((WT *)timers, timercnt, w->active - 1);	1388	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
680	}	1389	}
681		1390
682	w->at = w->repeat;	1391	((WT)w)->at -= mn_now;
683		1392
684	ev_stop ((W)w);	1393	ev_stop (EV_A_ (W)w);
685	}	1394	}
686		1395
687	void	1396	void
688	evtimer_again (struct ev_timer *w)	1397	ev_timer_again (EV_P_ struct ev_timer *w)
689	{	1398	{
690	if (ev_is_active (w))	1399	if (ev_is_active (w))
691	{	1400	{
692	if (w->repeat)	1401	if (w->repeat)
693	{	1402	{
694	w->at = now + w->repeat;	1403	((WT)w)->at = mn_now + w->repeat;
695	downheap ((WT *)timers, timercnt, w->active - 1);	1404	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
696	}	1405	}
697	else	1406	else
698	evtimer_stop (w);	1407	ev_timer_stop (EV_A_ w);
699	}	1408	}
700	else if (w->repeat)	1409	else if (w->repeat)
		1410	{
		1411	w->at = w->repeat;
701	evtimer_start (w);	1412	ev_timer_start (EV_A_ w);
		1413	}
702	}	1414	}
703		1415
		1416	#if EV_PERIODICS
704	void	1417	void
705	evperiodic_start (struct ev_periodic *w)	1418	ev_periodic_start (EV_P_ struct ev_periodic *w)
706	{	1419	{
707	if (ev_is_active (w))	1420	if (expect_false (ev_is_active (w)))
708	return;	1421	return;
709		1422
710	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1423	if (w->reschedule_cb)
711		1424	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1425	else if (w->interval)
		1426	{
		1427	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
712	/* this formula differs from the one in periodic_reify because we do not always round up */	1428	/* this formula differs from the one in periodic_reify because we do not always round up */
713	if (w->interval)
714	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1429	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1430	}
715		1431
716	ev_start ((W)w, ++periodiccnt);	1432	ev_start (EV_A_ (W)w, ++periodiccnt);
717	array_needsize (periodics, periodicmax, periodiccnt, );	1433	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
718	periodics [periodiccnt - 1] = w;	1434	periodics [periodiccnt - 1] = w;
719	upheap ((WT *)periodics, periodiccnt - 1);	1435	upheap ((WT *)periodics, periodiccnt - 1);
720	}
721		1436
		1437	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1438	}
		1439
722	void	1440	void
723	evperiodic_stop (struct ev_periodic *w)	1441	ev_periodic_stop (EV_P_ struct ev_periodic *w)
724	{	1442	{
		1443	ev_clear_pending (EV_A_ (W)w);
725	if (!ev_is_active (w))	1444	if (expect_false (!ev_is_active (w)))
726	return;	1445	return;
727		1446
		1447	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1448
728	if (w->active < periodiccnt--)	1449	if (expect_true (((W)w)->active < periodiccnt--))
729	{	1450	{
730	periodics [w->active - 1] = periodics [periodiccnt];	1451	periodics [((W)w)->active - 1] = periodics [periodiccnt];
731	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1452	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
732	}	1453	}
733		1454
734	ev_stop ((W)w);	1455	ev_stop (EV_A_ (W)w);
735	}	1456	}
736		1457
737	void	1458	void
		1459	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1460	{
		1461	/* TODO: use adjustheap and recalculation */
		1462	ev_periodic_stop (EV_A_ w);
		1463	ev_periodic_start (EV_A_ w);
		1464	}
		1465	#endif
		1466
		1467	void
		1468	ev_idle_start (EV_P_ struct ev_idle *w)
		1469	{
		1470	if (expect_false (ev_is_active (w)))
		1471	return;
		1472
		1473	ev_start (EV_A_ (W)w, ++idlecnt);
		1474	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1475	idles [idlecnt - 1] = w;
		1476	}
		1477
		1478	void
		1479	ev_idle_stop (EV_P_ struct ev_idle *w)
		1480	{
		1481	ev_clear_pending (EV_A_ (W)w);
		1482	if (expect_false (!ev_is_active (w)))
		1483	return;
		1484
		1485	idles [((W)w)->active - 1] = idles [--idlecnt];
		1486	ev_stop (EV_A_ (W)w);
		1487	}
		1488
		1489	void
		1490	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1491	{
		1492	if (expect_false (ev_is_active (w)))
		1493	return;
		1494
		1495	ev_start (EV_A_ (W)w, ++preparecnt);
		1496	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1497	prepares [preparecnt - 1] = w;
		1498	}
		1499
		1500	void
		1501	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1502	{
		1503	ev_clear_pending (EV_A_ (W)w);
		1504	if (expect_false (!ev_is_active (w)))
		1505	return;
		1506
		1507	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1508	ev_stop (EV_A_ (W)w);
		1509	}
		1510
		1511	void
		1512	ev_check_start (EV_P_ struct ev_check *w)
		1513	{
		1514	if (expect_false (ev_is_active (w)))
		1515	return;
		1516
		1517	ev_start (EV_A_ (W)w, ++checkcnt);
		1518	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1519	checks [checkcnt - 1] = w;
		1520	}
		1521
		1522	void
		1523	ev_check_stop (EV_P_ struct ev_check *w)
		1524	{
		1525	ev_clear_pending (EV_A_ (W)w);
		1526	if (expect_false (!ev_is_active (w)))
		1527	return;
		1528
		1529	checks [((W)w)->active - 1] = checks [--checkcnt];
		1530	ev_stop (EV_A_ (W)w);
		1531	}
		1532
		1533	#ifndef SA_RESTART
		1534	# define SA_RESTART 0
		1535	#endif
		1536
		1537	void
738	evsignal_start (struct ev_signal *w)	1538	ev_signal_start (EV_P_ struct ev_signal *w)
739	{	1539	{
		1540	#if EV_MULTIPLICITY
		1541	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1542	#endif
740	if (ev_is_active (w))	1543	if (expect_false (ev_is_active (w)))
741	return;	1544	return;
742		1545
		1546	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1547
743	ev_start ((W)w, 1);	1548	ev_start (EV_A_ (W)w, 1);
744	array_needsize (signals, signalmax, w->signum, signals_init);	1549	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
745	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1550	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
746		1551
747	if (!w->next)	1552	if (!((WL)w)->next)
748	{	1553	{
		1554	#if _WIN32
		1555	signal (w->signum, sighandler);
		1556	#else
749	struct sigaction sa;	1557	struct sigaction sa;
750	sa.sa_handler = sighandler;	1558	sa.sa_handler = sighandler;
751	sigfillset (&sa.sa_mask);	1559	sigfillset (&sa.sa_mask);
752	sa.sa_flags = 0;	1560	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
753	sigaction (w->signum, &sa, 0);	1561	sigaction (w->signum, &sa, 0);
		1562	#endif
754	}	1563	}
755	}	1564	}
756		1565
757	void	1566	void
758	evsignal_stop (struct ev_signal *w)	1567	ev_signal_stop (EV_P_ struct ev_signal *w)
759	{	1568	{
		1569	ev_clear_pending (EV_A_ (W)w);
760	if (!ev_is_active (w))	1570	if (expect_false (!ev_is_active (w)))
761	return;	1571	return;
762		1572
763	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1573	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
764	ev_stop ((W)w);	1574	ev_stop (EV_A_ (W)w);
765		1575
766	if (!signals [w->signum - 1].head)	1576	if (!signals [w->signum - 1].head)
767	signal (w->signum, SIG_DFL);	1577	signal (w->signum, SIG_DFL);
768	}	1578	}
769		1579
770	void evidle_start (struct ev_idle *w)	1580	void
		1581	ev_child_start (EV_P_ struct ev_child *w)
771	{	1582	{
		1583	#if EV_MULTIPLICITY
		1584	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1585	#endif
772	if (ev_is_active (w))	1586	if (expect_false (ev_is_active (w)))
773	return;	1587	return;
774		1588
775	ev_start ((W)w, ++idlecnt);	1589	ev_start (EV_A_ (W)w, 1);
776	array_needsize (idles, idlemax, idlecnt, );	1590	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
777	idles [idlecnt - 1] = w;
778	}	1591	}
779		1592
780	void evidle_stop (struct ev_idle *w)	1593	void
		1594	ev_child_stop (EV_P_ struct ev_child *w)
781	{	1595	{
782	idles [w->active - 1] = idles [--idlecnt];	1596	ev_clear_pending (EV_A_ (W)w);
		1597	if (expect_false (!ev_is_active (w)))
		1598	return;
		1599
		1600	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
783	ev_stop ((W)w);	1601	ev_stop (EV_A_ (W)w);
784	}
785
786	void evcheck_start (struct ev_check *w)
787	{
788	if (ev_is_active (w))
789	return;
790
791	ev_start ((W)w, ++checkcnt);
792	array_needsize (checks, checkmax, checkcnt, );
793	checks [checkcnt - 1] = w;
794	}
795
796	void evcheck_stop (struct ev_check *w)
797	{
798	checks [w->active - 1] = checks [--checkcnt];
799	ev_stop ((W)w);
800	}	1602	}
801		1603
802	/*****************************************************************************/	1604	/*****************************************************************************/
803		1605
804	#if 0	1606	struct ev_once
805		1607	{
806	struct ev_io wio;	1608	struct ev_io io;
807
808	static void
809	sin_cb (struct ev_io *w, int revents)
810	{
811	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
812	}
813
814	static void
815	ocb (struct ev_timer *w, int revents)
816	{
817	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
818	evtimer_stop (w);
819	evtimer_start (w);
820	}
821
822	static void
823	scb (struct ev_signal *w, int revents)
824	{
825	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
826	evio_stop (&wio);
827	evio_start (&wio);
828	}
829
830	static void
831	gcb (struct ev_signal *w, int revents)
832	{
833	fprintf (stderr, "generic %x\n", revents);
834
835	}
836
837	int main (void)
838	{
839	ev_init (0);
840
841	evio_init (&wio, sin_cb, 0, EV_READ);
842	evio_start (&wio);
843
844	struct ev_timer t[10000];
845
846	#if 0
847	int i;
848	for (i = 0; i < 10000; ++i)
849	{
850	struct ev_timer *w = t + i;
851	evw_init (w, ocb, i);
852	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
853	evtimer_start (w);
854	if (drand48 () < 0.5)
855	evtimer_stop (w);
856	}
857	#endif
858
859	struct ev_timer t1;	1609	struct ev_timer to;
860	evtimer_init (&t1, ocb, 5, 10);	1610	void (*cb)(int revents, void *arg);
861	evtimer_start (&t1);	1611	void *arg;
		1612	};
862		1613
863	struct ev_signal sig;	1614	static void
864	evsignal_init (&sig, scb, SIGQUIT);	1615	once_cb (EV_P_ struct ev_once *once, int revents)
865	evsignal_start (&sig);	1616	{
		1617	void (*cb)(int revents, void *arg) = once->cb;
		1618	void *arg = once->arg;
866		1619
867	struct ev_check cw;	1620	ev_io_stop (EV_A_ &once->io);
868	evcheck_init (&cw, gcb);	1621	ev_timer_stop (EV_A_ &once->to);
869	evcheck_start (&cw);	1622	ev_free (once);
870		1623
871	struct ev_idle iw;	1624	cb (revents, arg);
872	evidle_init (&iw, gcb);	1625	}
873	evidle_start (&iw);
874		1626
875	ev_loop (0);	1627	static void
		1628	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1629	{
		1630	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1631	}
876		1632
		1633	static void
		1634	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1635	{
		1636	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1637	}
		1638
		1639	void
		1640	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1641	{
		1642	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1643
		1644	if (expect_false (!once))
		1645	{
		1646	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
877	return 0;	1647	return;
878	}	1648	}
879		1649
880	#endif	1650	once->cb = cb;
		1651	once->arg = arg;
881		1652
		1653	ev_init (&once->io, once_cb_io);
		1654	if (fd >= 0)
		1655	{
		1656	ev_io_set (&once->io, fd, events);
		1657	ev_io_start (EV_A_ &once->io);
		1658	}
882		1659
		1660	ev_init (&once->to, once_cb_to);
		1661	if (timeout >= 0.)
		1662	{
		1663	ev_timer_set (&once->to, timeout, 0.);
		1664	ev_timer_start (EV_A_ &once->to);
		1665	}
		1666	}
883		1667
		1668	#ifdef __cplusplus
		1669	}
		1670	#endif
884		1671

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