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Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.126 by root, Sun Nov 18 01:25:23 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	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		56	# define EV_USE_SELECT 1
		57	# else
		58	# define EV_USE_SELECT 0
		59	# endif
		60
		61	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		62	# define EV_USE_POLL 1
		63	# else
		64	# define EV_USE_POLL 0
		65	# endif
		66
		67	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		68	# define EV_USE_EPOLL 1
		69	# else
		70	# define EV_USE_EPOLL 0
		71	# endif
		72
		73	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		74	# define EV_USE_KQUEUE 1
		75	# else
		76	# define EV_USE_KQUEUE 0
		77	# endif
		78
		79	# if HAVE_PORT_H && HAVE_PORT_CREATE && !defined (EV_USE_PORT)
		80	# define EV_USE_PORT 1
		81	# else
		82	# define EV_USE_PORT 0
		83	# endif
		84
		85	#endif
		86
1	#include <math.h>	87	#include <math.h>
2	#include <stdlib.h>	88	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	89	#include <fcntl.h>
5	#include <signal.h>	90	#include <stddef.h>
6		91
7	#include <stdio.h>	92	#include <stdio.h>
8		93
9	#include <assert.h>	94	#include <assert.h>
10	#include <errno.h>	95	#include <errno.h>
11	#include <sys/time.h>	96	#include <sys/types.h>
12	#include <time.h>	97	#include <time.h>
13		98
		99	#include <signal.h>
		100
		101	#ifndef _WIN32
		102	# include <unistd.h>
		103	# include <sys/time.h>
		104	# include <sys/wait.h>
		105	#else
		106	# define WIN32_LEAN_AND_MEAN
		107	# include <windows.h>
		108	# ifndef EV_SELECT_IS_WINSOCKET
		109	# define EV_SELECT_IS_WINSOCKET 1
		110	# endif
		111	#endif
		112
		113	/**/
		114
		115	#ifndef EV_USE_MONOTONIC
		116	# define EV_USE_MONOTONIC 0
		117	#endif
		118
		119	#ifndef EV_USE_REALTIME
		120	# define EV_USE_REALTIME 0
		121	#endif
		122
		123	#ifndef EV_USE_SELECT
		124	# define EV_USE_SELECT 1
		125	#endif
		126
		127	#ifndef EV_USE_POLL
		128	# ifdef _WIN32
		129	# define EV_USE_POLL 0
		130	# else
		131	# define EV_USE_POLL 1
		132	# endif
		133	#endif
		134
		135	#ifndef EV_USE_EPOLL
		136	# define EV_USE_EPOLL 0
		137	#endif
		138
		139	#ifndef EV_USE_KQUEUE
		140	# define EV_USE_KQUEUE 0
		141	#endif
		142
		143	#ifndef EV_USE_PORT
		144	# define EV_USE_PORT 0
		145	#endif
		146
		147	/**/
		148
		149	/* darwin simply cannot be helped */
		150	#ifdef __APPLE__
		151	# undef EV_USE_POLL
		152	# undef EV_USE_KQUEUE
		153	#endif
		154
14	#ifdef CLOCK_MONOTONIC	155	#ifndef CLOCK_MONOTONIC
		156	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	157	# define EV_USE_MONOTONIC 0
16	#endif	158	#endif
17		159
		160	#ifndef CLOCK_REALTIME
		161	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	162	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	163	#endif
20	#define HAVE_SELECT 1	164
		165	#if EV_SELECT_IS_WINSOCKET
		166	# include <winsock.h>
		167	#endif
		168
		169	/**/
21		170
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	171	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	172	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		173	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		174	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
24		175
		176	#ifdef EV_H
		177	# include EV_H
		178	#else
25	#include "ev.h"	179	# include "ev.h"
		180	#endif
26		181
		182	#if __GNUC__ >= 3
		183	# define expect(expr,value) __builtin_expect ((expr),(value))
		184	# define inline static inline
		185	#else
		186	# define expect(expr,value) (expr)
		187	# define inline static
		188	#endif
		189
		190	#define expect_false(expr) expect ((expr) != 0, 0)
		191	#define expect_true(expr) expect ((expr) != 0, 1)
		192
		193	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		194	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		195
		196	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		197	#define EMPTY2(a,b) /* used to suppress some warnings */
		198
27	struct ev_watcher {	199	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	200	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	201	typedef struct ev_watcher_time *WT;
33	};
34		202
35	static ev_tstamp now, diff; /* monotonic clock */	203	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		204
		205	#ifdef _WIN32
		206	# include "ev_win32.c"
		207	#endif
		208
		209	/*****************************************************************************/
		210
		211	static void (*syserr_cb)(const char *msg);
		212
		213	void ev_set_syserr_cb (void (*cb)(const char *msg))
		214	{
		215	syserr_cb = cb;
		216	}
		217
		218	static void
		219	syserr (const char *msg)
		220	{
		221	if (!msg)
		222	msg = "(libev) system error";
		223
		224	if (syserr_cb)
		225	syserr_cb (msg);
		226	else
		227	{
		228	perror (msg);
		229	abort ();
		230	}
		231	}
		232
		233	static void *(*alloc)(void *ptr, long size);
		234
		235	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		236	{
		237	alloc = cb;
		238	}
		239
		240	static void *
		241	ev_realloc (void *ptr, long size)
		242	{
		243	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		244
		245	if (!ptr && size)
		246	{
		247	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		248	abort ();
		249	}
		250
		251	return ptr;
		252	}
		253
		254	#define ev_malloc(size) ev_realloc (0, (size))
		255	#define ev_free(ptr) ev_realloc ((ptr), 0)
		256
		257	/*****************************************************************************/
		258
		259	typedef struct
		260	{
		261	WL head;
		262	unsigned char events;
		263	unsigned char reify;
		264	#if EV_SELECT_IS_WINSOCKET
		265	SOCKET handle;
		266	#endif
		267	} ANFD;
		268
		269	typedef struct
		270	{
		271	W w;
		272	int events;
		273	} ANPENDING;
		274
		275	#if EV_MULTIPLICITY
		276
		277	struct ev_loop
		278	{
		279	ev_tstamp ev_rt_now;
		280	#define ev_rt_now ((loop)->ev_rt_now)
		281	#define VAR(name,decl) decl;
		282	#include "ev_vars.h"
		283	#undef VAR
		284	};
		285	#include "ev_wrap.h"
		286
		287	static struct ev_loop default_loop_struct;
		288	struct ev_loop *ev_default_loop_ptr;
		289
		290	#else
		291
36	ev_tstamp ev_now;	292	ev_tstamp ev_rt_now;
37	int ev_method;	293	#define VAR(name,decl) static decl;
		294	#include "ev_vars.h"
		295	#undef VAR
38		296
39	static int have_monotonic; /* runtime */	297	static int ev_default_loop_ptr;
40		298
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	299	#endif
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		300
45	/*****************************************************************************/	301	/*****************************************************************************/
46		302
47	ev_tstamp	303	ev_tstamp
48	ev_time (void)	304	ev_time (void)
49	{	305	{
50	#if HAVE_REALTIME	306	#if EV_USE_REALTIME
51	struct timespec ts;	307	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	308	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	309	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	310	#else
55	struct timeval tv;	311	struct timeval tv;
56	gettimeofday (&tv, 0);	312	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	313	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	314	#endif
59	}	315	}
60		316
61	static ev_tstamp	317	inline ev_tstamp
62	get_clock (void)	318	get_clock (void)
63	{	319	{
64	#if HAVE_MONOTONIC	320	#if EV_USE_MONOTONIC
65	if (have_monotonic)	321	if (expect_true (have_monotonic))
66	{	322	{
67	struct timespec ts;	323	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	324	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	325	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	326	}
71	#endif	327	#endif
72		328
73	return ev_time ();	329	return ev_time ();
74	}	330	}
75		331
		332	#if EV_MULTIPLICITY
		333	ev_tstamp
		334	ev_now (EV_P)
		335	{
		336	return ev_rt_now;
		337	}
		338	#endif
		339
		340	#define array_roundsize(type,n) (((n) | 4) & ~3)
		341
76	#define array_needsize(base,cur,cnt,init) \	342	#define array_needsize(type,base,cur,cnt,init) \
77	if ((cnt) > cur) \	343	if (expect_false ((cnt) > cur)) \
78	{ \	344	{ \
79	int newcnt = cur ? cur << 1 : 16; \	345	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	346	do \
		347	{ \
		348	newcnt = array_roundsize (type, newcnt << 1); \
		349	} \
		350	while ((cnt) > newcnt); \
		351	\
81	base = realloc (base, sizeof (*base) * (newcnt)); \	352	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
82	init (base + cur, newcnt - cur); \	353	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	354	cur = newcnt; \
84	}	355	}
		356
		357	#define array_slim(type,stem) \
		358	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		359	{ \
		360	stem ## max = array_roundsize (stem ## cnt >> 1); \
		361	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		362	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		363	}
		364
		365	#define array_free(stem, idx) \
		366	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
85		367
86	/*****************************************************************************/	368	/*****************************************************************************/
87		369
88	typedef struct
89	{
90	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */
92	} ANFD;
93
94	static ANFD *anfds;
95	static int anfdmax;
96
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void	370	static void
101	anfds_init (ANFD *base, int count)	371	anfds_init (ANFD *base, int count)
102	{	372	{
103	while (count--)	373	while (count--)
104	{	374	{
105	base->head = 0;	375	base->head = 0;
106	base->wev = base->rev = EV_NONE;	376	base->events = EV_NONE;
		377	base->reify = 0;
		378
107	++base;	379	++base;
108	}	380	}
109	}	381	}
110		382
111	typedef struct	383	void
		384	ev_feed_event (EV_P_ void *w, int revents)
112	{	385	{
113	struct ev_watcher *w;	386	W w_ = (W)w;
114	int events;
115	} ANPENDING;
116		387
117	static ANPENDING *pendings;	388	if (expect_false (w_->pending))
118	static int pendingmax, pendingcnt;	389	{
		390	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		391	return;
		392	}
119		393
120	static void
121	event (struct ev_watcher *w, int events)
122	{
123	w->pending = ++pendingcnt;	394	w_->pending = ++pendingcnt [ABSPRI (w_)];
124	array_needsize (pendings, pendingmax, pendingcnt, );	395	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
125	pendings [pendingcnt - 1].w = w;	396	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
126	pendings [pendingcnt - 1].events = events;	397	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
127	}	398	}
128		399
129	static void	400	static void
		401	queue_events (EV_P_ W *events, int eventcnt, int type)
		402	{
		403	int i;
		404
		405	for (i = 0; i < eventcnt; ++i)
		406	ev_feed_event (EV_A_ events [i], type);
		407	}
		408
		409	inline void
130	fd_event (int fd, int events)	410	fd_event (EV_P_ int fd, int revents)
131	{	411	{
132	ANFD *anfd = anfds + fd;	412	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	413	struct ev_io *w;
134		414
135	for (w = anfd->head; w; w = w->next)	415	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
136	{	416	{
137	int ev = w->events & events;	417	int ev = w->events & revents;
138		418
139	if (ev)	419	if (ev)
140	event ((struct ev_watcher *)w, ev);	420	ev_feed_event (EV_A_ (W)w, ev);
141	}	421	}
142	}	422	}
143		423
144	static void	424	void
145	queue_events (struct ev_watcher **events, int eventcnt, int type)	425	ev_feed_fd_event (EV_P_ int fd, int revents)
146	{	426	{
147	int i;	427	fd_event (EV_A_ fd, revents);
148
149	for (i = 0; i < eventcnt; ++i)
150	event (events [i], type);
151	}	428	}
152		429
153	/*****************************************************************************/	430	/*****************************************************************************/
154		431
155	static struct ev_timer **atimers;	432	inline void
156	static int atimermax, atimercnt;	433	fd_reify (EV_P)
157
158	static struct ev_timer **rtimers;
159	static int rtimermax, rtimercnt;
160
161	static void
162	upheap (struct ev_timer **timers, int k)
163	{
164	struct ev_timer *w = timers [k];
165
166	while (k && timers [k >> 1]->at > w->at)
167	{
168	timers [k] = timers [k >> 1];
169	timers [k]->active = k + 1;
170	k >>= 1;
171	}
172
173	timers [k] = w;
174	timers [k]->active = k + 1;
175
176	}
177
178	static void
179	downheap (struct ev_timer **timers, int N, int k)
180	{
181	struct ev_timer *w = timers [k];
182
183	while (k < (N >> 1))
184	{
185	int j = k << 1;
186
187	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
188	++j;
189
190	if (w->at <= timers [j]->at)
191	break;
192
193	timers [k] = timers [j];
194	timers [k]->active = k + 1;
195	k = j;
196	}
197
198	timers [k] = w;
199	timers [k]->active = k + 1;
200	}
201
202	/*****************************************************************************/
203
204	typedef struct
205	{
206	struct ev_signal *head;
207	sig_atomic_t gotsig;
208	} ANSIG;
209
210	static ANSIG *signals;
211	static int signalmax;
212
213	static int sigpipe [2];
214	static sig_atomic_t gotsig;
215	static struct ev_io sigev;
216
217	static void
218	signals_init (ANSIG *base, int count)
219	{
220	while (count--)
221	{
222	base->head = 0;
223	base->gotsig = 0;
224	++base;
225	}
226	}
227
228	static void
229	sighandler (int signum)
230	{
231	signals [signum - 1].gotsig = 1;
232
233	if (!gotsig)
234	{
235	gotsig = 1;
236	write (sigpipe [1], &gotsig, 1);
237	}
238	}
239
240	static void
241	sigcb (struct ev_io *iow, int revents)
242	{
243	struct ev_signal *w;
244	int sig;
245
246	gotsig = 0;
247	read (sigpipe [0], &revents, 1);
248
249	for (sig = signalmax; sig--; )
250	if (signals [sig].gotsig)
251	{
252	signals [sig].gotsig = 0;
253
254	for (w = signals [sig].head; w; w = w->next)
255	event ((struct ev_watcher *)w, EV_SIGNAL);
256	}
257	}
258
259	static void
260	siginit (void)
261	{
262	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
263	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
264
265	/* rather than sort out wether we really need nb, set it */
266	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
267	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
268
269	evio_set (&sigev, sigpipe [0], EV_READ);
270	evio_start (&sigev);
271	}
272
273	/*****************************************************************************/
274
275	static struct ev_idle **idles;
276	static int idlemax, idlecnt;
277
278	static struct ev_check **checks;
279	static int checkmax, checkcnt;
280
281	/*****************************************************************************/
282
283	#if HAVE_EPOLL
284	# include "ev_epoll.c"
285	#endif
286	#if HAVE_SELECT
287	# include "ev_select.c"
288	#endif
289
290	int ev_init (int flags)
291	{
292	#if HAVE_MONOTONIC
293	{
294	struct timespec ts;
295	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296	have_monotonic = 1;
297	}
298	#endif
299
300	ev_now = ev_time ();
301	now = get_clock ();
302	diff = ev_now - now;
303
304	if (pipe (sigpipe))
305	return 0;
306
307	ev_method = EVMETHOD_NONE;
308	#if HAVE_EPOLL
309	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
310	#endif
311	#if HAVE_SELECT
312	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	#endif
314
315	if (ev_method)
316	{
317	evw_init (&sigev, sigcb, 0);
318	siginit ();
319	}
320
321	return ev_method;
322	}
323
324	/*****************************************************************************/
325
326	void ev_prefork (void)
327	{
328	}
329
330	void ev_postfork_parent (void)
331	{
332	}
333
334	void ev_postfork_child (void)
335	{
336	#if HAVE_EPOLL
337	if (ev_method == EVMETHOD_EPOLL)
338	epoll_postfork_child ();
339	#endif
340
341	evio_stop (&sigev);
342	close (sigpipe [0]);
343	close (sigpipe [1]);
344	pipe (sigpipe);
345	siginit ();
346	}
347
348	/*****************************************************************************/
349
350	static void
351	fd_reify (void)
352	{	434	{
353	int i;	435	int i;
354		436
355	for (i = 0; i < fdchangecnt; ++i)	437	for (i = 0; i < fdchangecnt; ++i)
356	{	438	{
357	int fd = fdchanges [i];	439	int fd = fdchanges [i];
358	ANFD *anfd = anfds + fd;	440	ANFD *anfd = anfds + fd;
359	struct ev_io *w;	441	struct ev_io *w;
360		442
361	int wev = 0;	443	int events = 0;
362		444
363	for (w = anfd->head; w; w = w->next)	445	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
364	wev |= w->events;	446	events |= w->events;
365		447
366	if (anfd->wev != wev)	448	#if EV_SELECT_IS_WINSOCKET
		449	if (events)
367	{	450	{
368	method_modify (fd, anfd->wev, wev);	451	unsigned long argp;
369	anfd->wev = wev;	452	anfd->handle = _get_osfhandle (fd);
		453	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
370	}	454	}
		455	#endif
		456
		457	anfd->reify = 0;
		458
		459	method_modify (EV_A_ fd, anfd->events, events);
		460	anfd->events = events;
371	}	461	}
372		462
373	fdchangecnt = 0;	463	fdchangecnt = 0;
374	}	464	}
375		465
376	static void	466	static void
377	call_pending ()	467	fd_change (EV_P_ int fd)
		468	{
		469	if (expect_false (anfds [fd].reify))
		470	return;
		471
		472	anfds [fd].reify = 1;
		473
		474	++fdchangecnt;
		475	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		476	fdchanges [fdchangecnt - 1] = fd;
		477	}
		478
		479	static void
		480	fd_kill (EV_P_ int fd)
		481	{
		482	struct ev_io *w;
		483
		484	while ((w = (struct ev_io *)anfds [fd].head))
		485	{
		486	ev_io_stop (EV_A_ w);
		487	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		488	}
		489	}
		490
		491	inline int
		492	fd_valid (int fd)
		493	{
		494	#ifdef _WIN32
		495	return _get_osfhandle (fd) != -1;
		496	#else
		497	return fcntl (fd, F_GETFD) != -1;
		498	#endif
		499	}
		500
		501	/* called on EBADF to verify fds */
		502	static void
		503	fd_ebadf (EV_P)
		504	{
		505	int fd;
		506
		507	for (fd = 0; fd < anfdmax; ++fd)
		508	if (anfds [fd].events)
		509	if (!fd_valid (fd) == -1 && errno == EBADF)
		510	fd_kill (EV_A_ fd);
		511	}
		512
		513	/* called on ENOMEM in select/poll to kill some fds and retry */
		514	static void
		515	fd_enomem (EV_P)
		516	{
		517	int fd;
		518
		519	for (fd = anfdmax; fd--; )
		520	if (anfds [fd].events)
		521	{
		522	fd_kill (EV_A_ fd);
		523	return;
		524	}
		525	}
		526
		527	/* usually called after fork if method needs to re-arm all fds from scratch */
		528	static void
		529	fd_rearm_all (EV_P)
		530	{
		531	int fd;
		532
		533	/* this should be highly optimised to not do anything but set a flag */
		534	for (fd = 0; fd < anfdmax; ++fd)
		535	if (anfds [fd].events)
		536	{
		537	anfds [fd].events = 0;
		538	fd_change (EV_A_ fd);
		539	}
		540	}
		541
		542	/*****************************************************************************/
		543
		544	static void
		545	upheap (WT *heap, int k)
		546	{
		547	WT w = heap [k];
		548
		549	while (k && heap [k >> 1]->at > w->at)
		550	{
		551	heap [k] = heap [k >> 1];
		552	((W)heap [k])->active = k + 1;
		553	k >>= 1;
		554	}
		555
		556	heap [k] = w;
		557	((W)heap [k])->active = k + 1;
		558
		559	}
		560
		561	static void
		562	downheap (WT *heap, int N, int k)
		563	{
		564	WT w = heap [k];
		565
		566	while (k < (N >> 1))
		567	{
		568	int j = k << 1;
		569
		570	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		571	++j;
		572
		573	if (w->at <= heap [j]->at)
		574	break;
		575
		576	heap [k] = heap [j];
		577	((W)heap [k])->active = k + 1;
		578	k = j;
		579	}
		580
		581	heap [k] = w;
		582	((W)heap [k])->active = k + 1;
		583	}
		584
		585	inline void
		586	adjustheap (WT *heap, int N, int k)
		587	{
		588	upheap (heap, k);
		589	downheap (heap, N, k);
		590	}
		591
		592	/*****************************************************************************/
		593
		594	typedef struct
		595	{
		596	WL head;
		597	sig_atomic_t volatile gotsig;
		598	} ANSIG;
		599
		600	static ANSIG *signals;
		601	static int signalmax;
		602
		603	static int sigpipe [2];
		604	static sig_atomic_t volatile gotsig;
		605	static struct ev_io sigev;
		606
		607	static void
		608	signals_init (ANSIG *base, int count)
		609	{
		610	while (count--)
		611	{
		612	base->head = 0;
		613	base->gotsig = 0;
		614
		615	++base;
		616	}
		617	}
		618
		619	static void
		620	sighandler (int signum)
		621	{
		622	#if _WIN32
		623	signal (signum, sighandler);
		624	#endif
		625
		626	signals [signum - 1].gotsig = 1;
		627
		628	if (!gotsig)
		629	{
		630	int old_errno = errno;
		631	gotsig = 1;
		632	write (sigpipe [1], &signum, 1);
		633	errno = old_errno;
		634	}
		635	}
		636
		637	void
		638	ev_feed_signal_event (EV_P_ int signum)
		639	{
		640	WL w;
		641
		642	#if EV_MULTIPLICITY
		643	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		644	#endif
		645
		646	--signum;
		647
		648	if (signum < 0 || signum >= signalmax)
		649	return;
		650
		651	signals [signum].gotsig = 0;
		652
		653	for (w = signals [signum].head; w; w = w->next)
		654	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		655	}
		656
		657	static void
		658	sigcb (EV_P_ struct ev_io *iow, int revents)
		659	{
		660	int signum;
		661
		662	read (sigpipe [0], &revents, 1);
		663	gotsig = 0;
		664
		665	for (signum = signalmax; signum--; )
		666	if (signals [signum].gotsig)
		667	ev_feed_signal_event (EV_A_ signum + 1);
		668	}
		669
		670	static void
		671	fd_intern (int fd)
		672	{
		673	#ifdef _WIN32
		674	int arg = 1;
		675	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		676	#else
		677	fcntl (fd, F_SETFD, FD_CLOEXEC);
		678	fcntl (fd, F_SETFL, O_NONBLOCK);
		679	#endif
		680	}
		681
		682	static void
		683	siginit (EV_P)
		684	{
		685	fd_intern (sigpipe [0]);
		686	fd_intern (sigpipe [1]);
		687
		688	ev_io_set (&sigev, sigpipe [0], EV_READ);
		689	ev_io_start (EV_A_ &sigev);
		690	ev_unref (EV_A); /* child watcher should not keep loop alive */
		691	}
		692
		693	/*****************************************************************************/
		694
		695	static struct ev_child *childs [PID_HASHSIZE];
		696
		697	#ifndef _WIN32
		698
		699	static struct ev_signal childev;
		700
		701	#ifndef WCONTINUED
		702	# define WCONTINUED 0
		703	#endif
		704
		705	static void
		706	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		707	{
		708	struct ev_child *w;
		709
		710	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		711	if (w->pid == pid || !w->pid)
		712	{
		713	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		714	w->rpid = pid;
		715	w->rstatus = status;
		716	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		717	}
		718	}
		719
		720	static void
		721	childcb (EV_P_ struct ev_signal *sw, int revents)
		722	{
		723	int pid, status;
		724
		725	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		726	{
		727	/* make sure we are called again until all childs have been reaped */
		728	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		729
		730	child_reap (EV_A_ sw, pid, pid, status);
		731	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		732	}
		733	}
		734
		735	#endif
		736
		737	/*****************************************************************************/
		738
		739	#if EV_USE_PORT
		740	# include "ev_port.c"
		741	#endif
		742	#if EV_USE_KQUEUE
		743	# include "ev_kqueue.c"
		744	#endif
		745	#if EV_USE_EPOLL
		746	# include "ev_epoll.c"
		747	#endif
		748	#if EV_USE_POLL
		749	# include "ev_poll.c"
		750	#endif
		751	#if EV_USE_SELECT
		752	# include "ev_select.c"
		753	#endif
		754
		755	int
		756	ev_version_major (void)
		757	{
		758	return EV_VERSION_MAJOR;
		759	}
		760
		761	int
		762	ev_version_minor (void)
		763	{
		764	return EV_VERSION_MINOR;
		765	}
		766
		767	/* return true if we are running with elevated privileges and should ignore env variables */
		768	static int
		769	enable_secure (void)
		770	{
		771	#ifdef _WIN32
		772	return 0;
		773	#else
		774	return getuid () != geteuid ()
		775	|| getgid () != getegid ();
		776	#endif
		777	}
		778
		779	unsigned int
		780	ev_method (EV_P)
		781	{
		782	return method;
		783	}
		784
		785	static void
		786	loop_init (EV_P_ unsigned int flags)
		787	{
		788	if (!method)
		789	{
		790	#if EV_USE_MONOTONIC
		791	{
		792	struct timespec ts;
		793	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		794	have_monotonic = 1;
		795	}
		796	#endif
		797
		798	ev_rt_now = ev_time ();
		799	mn_now = get_clock ();
		800	now_floor = mn_now;
		801	rtmn_diff = ev_rt_now - mn_now;
		802
		803	if (!(flags & EVFLAG_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		804	flags = atoi (getenv ("LIBEV_FLAGS"));
		805
		806	if (!(flags & 0x0000ffff))
		807	flags |= 0x0000ffff;
		808
		809	method = 0;
		810	#if EV_USE_PORT
		811	if (!method && (flags & EVMETHOD_PORT )) method = port_init (EV_A_ flags);
		812	#endif
		813	#if EV_USE_KQUEUE
		814	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		815	#endif
		816	#if EV_USE_EPOLL
		817	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
		818	#endif
		819	#if EV_USE_POLL
		820	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		821	#endif
		822	#if EV_USE_SELECT
		823	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
		824	#endif
		825
		826	ev_init (&sigev, sigcb);
		827	ev_set_priority (&sigev, EV_MAXPRI);
		828	}
		829	}
		830
		831	static void
		832	loop_destroy (EV_P)
378	{	833	{
379	int i;	834	int i;
380		835
381	for (i = 0; i < pendingcnt; ++i)	836	#if EV_USE_PORT
		837	if (method == EVMETHOD_PORT ) port_destroy (EV_A);
		838	#endif
		839	#if EV_USE_KQUEUE
		840	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		841	#endif
		842	#if EV_USE_EPOLL
		843	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		844	#endif
		845	#if EV_USE_POLL
		846	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		847	#endif
		848	#if EV_USE_SELECT
		849	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		850	#endif
		851
		852	for (i = NUMPRI; i--; )
		853	array_free (pending, [i]);
		854
		855	/* have to use the microsoft-never-gets-it-right macro */
		856	array_free (fdchange, EMPTY0);
		857	array_free (timer, EMPTY0);
		858	#if EV_PERIODICS
		859	array_free (periodic, EMPTY0);
		860	#endif
		861	array_free (idle, EMPTY0);
		862	array_free (prepare, EMPTY0);
		863	array_free (check, EMPTY0);
		864
		865	method = 0;
		866	}
		867
		868	static void
		869	loop_fork (EV_P)
		870	{
		871	#if EV_USE_PORT
		872	if (method == EVMETHOD_PORT ) port_fork (EV_A);
		873	#endif
		874	#if EV_USE_KQUEUE
		875	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		876	#endif
		877	#if EV_USE_EPOLL
		878	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		879	#endif
		880
		881	if (ev_is_active (&sigev))
		882	{
		883	/* default loop */
		884
		885	ev_ref (EV_A);
		886	ev_io_stop (EV_A_ &sigev);
		887	close (sigpipe [0]);
		888	close (sigpipe [1]);
		889
		890	while (pipe (sigpipe))
		891	syserr ("(libev) error creating pipe");
		892
		893	siginit (EV_A);
382	{	894	}
383	ANPENDING *p = pendings + i;
384		895
385	if (p->w)	896	postfork = 0;
		897	}
		898
		899	#if EV_MULTIPLICITY
		900	struct ev_loop *
		901	ev_loop_new (unsigned int flags)
		902	{
		903	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		904
		905	memset (loop, 0, sizeof (struct ev_loop));
		906
		907	loop_init (EV_A_ flags);
		908
		909	if (ev_method (EV_A))
		910	return loop;
		911
		912	return 0;
		913	}
		914
		915	void
		916	ev_loop_destroy (EV_P)
		917	{
		918	loop_destroy (EV_A);
		919	ev_free (loop);
		920	}
		921
		922	void
		923	ev_loop_fork (EV_P)
		924	{
		925	postfork = 1;
		926	}
		927
		928	#endif
		929
		930	#if EV_MULTIPLICITY
		931	struct ev_loop *
		932	ev_default_loop_init (unsigned int flags)
		933	#else
		934	int
		935	ev_default_loop (unsigned int flags)
		936	#endif
		937	{
		938	if (sigpipe [0] == sigpipe [1])
		939	if (pipe (sigpipe))
		940	return 0;
		941
		942	if (!ev_default_loop_ptr)
		943	{
		944	#if EV_MULTIPLICITY
		945	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		946	#else
		947	ev_default_loop_ptr = 1;
		948	#endif
		949
		950	loop_init (EV_A_ flags);
		951
		952	if (ev_method (EV_A))
386	{	953	{
387	p->w->pending = 0;	954	siginit (EV_A);
388	p->w->cb (p->w, p->events);	955
		956	#ifndef _WIN32
		957	ev_signal_init (&childev, childcb, SIGCHLD);
		958	ev_set_priority (&childev, EV_MAXPRI);
		959	ev_signal_start (EV_A_ &childev);
		960	ev_unref (EV_A); /* child watcher should not keep loop alive */
		961	#endif
389	}	962	}
		963	else
		964	ev_default_loop_ptr = 0;
		965	}
		966
		967	return ev_default_loop_ptr;
		968	}
		969
		970	void
		971	ev_default_destroy (void)
		972	{
		973	#if EV_MULTIPLICITY
		974	struct ev_loop *loop = ev_default_loop_ptr;
		975	#endif
		976
		977	#ifndef _WIN32
		978	ev_ref (EV_A); /* child watcher */
		979	ev_signal_stop (EV_A_ &childev);
		980	#endif
		981
		982	ev_ref (EV_A); /* signal watcher */
		983	ev_io_stop (EV_A_ &sigev);
		984
		985	close (sigpipe [0]); sigpipe [0] = 0;
		986	close (sigpipe [1]); sigpipe [1] = 0;
		987
		988	loop_destroy (EV_A);
		989	}
		990
		991	void
		992	ev_default_fork (void)
		993	{
		994	#if EV_MULTIPLICITY
		995	struct ev_loop *loop = ev_default_loop_ptr;
		996	#endif
		997
		998	if (method)
		999	postfork = 1;
		1000	}
		1001
		1002	/*****************************************************************************/
		1003
		1004	static int
		1005	any_pending (EV_P)
		1006	{
		1007	int pri;
		1008
		1009	for (pri = NUMPRI; pri--; )
		1010	if (pendingcnt [pri])
		1011	return 1;
		1012
		1013	return 0;
		1014	}
		1015
		1016	inline void
		1017	call_pending (EV_P)
		1018	{
		1019	int pri;
		1020
		1021	for (pri = NUMPRI; pri--; )
		1022	while (pendingcnt [pri])
		1023	{
		1024	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1025
		1026	if (expect_true (p->w))
		1027	{
		1028	p->w->pending = 0;
		1029	EV_CB_INVOKE (p->w, p->events);
		1030	}
390	}	1031	}
391
392	pendingcnt = 0;
393	}	1032	}
394		1033
395	static void	1034	inline void
396	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1035	timers_reify (EV_P)
397	{	1036	{
398	while (timercnt && timers [0]->at <= now)	1037	while (timercnt && ((WT)timers [0])->at <= mn_now)
399	{	1038	{
400	struct ev_timer *w = timers [0];	1039	struct ev_timer *w = timers [0];
		1040
		1041	assert (("inactive timer on timer heap detected", ev_is_active (w)));
401		1042
402	/* first reschedule or stop timer */	1043	/* first reschedule or stop timer */
403	if (w->repeat)	1044	if (w->repeat)
404	{	1045	{
405	if (w->is_abs)	1046	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
406	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1047
407	else
408	w->at = now + w->repeat;	1048	((WT)w)->at += w->repeat;
		1049	if (((WT)w)->at < mn_now)
		1050	((WT)w)->at = mn_now;
409		1051
410	assert (w->at > now);
411
412	downheap (timers, timercnt, 0);	1052	downheap ((WT *)timers, timercnt, 0);
413	}	1053	}
414	else	1054	else
		1055	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1056
		1057	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1058	}
		1059	}
		1060
		1061	#if EV_PERIODICS
		1062	inline void
		1063	periodics_reify (EV_P)
		1064	{
		1065	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1066	{
		1067	struct ev_periodic *w = periodics [0];
		1068
		1069	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1070
		1071	/* first reschedule or stop timer */
		1072	if (w->reschedule_cb)
415	{	1073	{
416	evtimer_stop (w); /* nonrepeating: stop timer */	1074	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
417	--timercnt; /* maybe pass by reference instead? */	1075	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1076	downheap ((WT *)periodics, periodiccnt, 0);
418	}	1077	}
		1078	else if (w->interval)
		1079	{
		1080	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1081	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1082	downheap ((WT *)periodics, periodiccnt, 0);
		1083	}
		1084	else
		1085	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
419		1086
420	event ((struct ev_watcher *)w, EV_TIMEOUT);	1087	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
421	}	1088	}
422	}	1089	}
423		1090
424	static void	1091	static void
425	time_update ()	1092	periodics_reschedule (EV_P)
426	{	1093	{
427	int i;	1094	int i;
		1095
		1096	/* adjust periodics after time jump */
		1097	for (i = 0; i < periodiccnt; ++i)
		1098	{
		1099	struct ev_periodic *w = periodics [i];
		1100
		1101	if (w->reschedule_cb)
		1102	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1103	else if (w->interval)
		1104	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1105	}
		1106
		1107	/* now rebuild the heap */
		1108	for (i = periodiccnt >> 1; i--; )
		1109	downheap ((WT *)periodics, periodiccnt, i);
		1110	}
		1111	#endif
		1112
		1113	inline int
		1114	time_update_monotonic (EV_P)
		1115	{
		1116	mn_now = get_clock ();
		1117
		1118	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1119	{
		1120	ev_rt_now = rtmn_diff + mn_now;
		1121	return 0;
		1122	}
		1123	else
		1124	{
		1125	now_floor = mn_now;
428	ev_now = ev_time ();	1126	ev_rt_now = ev_time ();
429		1127	return 1;
430	if (have_monotonic)
431	{	1128	}
432	ev_tstamp odiff = diff;	1129	}
433		1130
434	/* detecting time jumps is much more difficult */	1131	inline void
435	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1132	time_update (EV_P)
		1133	{
		1134	int i;
		1135
		1136	#if EV_USE_MONOTONIC
		1137	if (expect_true (have_monotonic))
		1138	{
		1139	if (time_update_monotonic (EV_A))
436	{	1140	{
437	now = get_clock ();	1141	ev_tstamp odiff = rtmn_diff;
		1142
		1143	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1144	{
438	diff = ev_now - now;	1145	rtmn_diff = ev_rt_now - mn_now;
439		1146
440	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1147	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
441	return; /* all is well */	1148	return; /* all is well */
442		1149
443	ev_now = ev_time ();	1150	ev_rt_now = ev_time ();
		1151	mn_now = get_clock ();
		1152	now_floor = mn_now;
		1153	}
		1154
		1155	# if EV_PERIODICS
		1156	periodics_reschedule (EV_A);
		1157	# endif
		1158	/* no timer adjustment, as the monotonic clock doesn't jump */
		1159	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
444	}	1160	}
		1161	}
		1162	else
		1163	#endif
		1164	{
		1165	ev_rt_now = ev_time ();
445		1166
446	/* time jump detected, reschedule atimers */	1167	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
447	for (i = 0; i < atimercnt; ++i)
448	{	1168	{
449	struct ev_timer *w = atimers [i];	1169	#if EV_PERIODICS
450	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1170	periodics_reschedule (EV_A);
		1171	#endif
		1172
		1173	/* adjust timers. this is easy, as the offset is the same for all */
		1174	for (i = 0; i < timercnt; ++i)
		1175	((WT)timers [i])->at += ev_rt_now - mn_now;
451	}	1176	}
452	}
453	else
454	{
455	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
456	/* time jump detected, adjust rtimers */
457	for (i = 0; i < rtimercnt; ++i)
458	rtimers [i]->at += ev_now - now;
459		1177
460	now = ev_now;	1178	mn_now = ev_rt_now;
461	}	1179	}
462	}	1180	}
463		1181
464	int ev_loop_done;	1182	void
		1183	ev_ref (EV_P)
		1184	{
		1185	++activecnt;
		1186	}
465		1187
		1188	void
		1189	ev_unref (EV_P)
		1190	{
		1191	--activecnt;
		1192	}
		1193
		1194	static int loop_done;
		1195
		1196	void
466	void ev_loop (int flags)	1197	ev_loop (EV_P_ int flags)
467	{	1198	{
468	double block;	1199	double block;
469	ev_loop_done = flags & EVLOOP_ONESHOT;	1200	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
470		1201
471	if (checkcnt)	1202	while (activecnt)
472	{	1203	{
473	queue_events (checks, checkcnt, EV_CHECK);	1204	/* queue check watchers (and execute them) */
		1205	if (expect_false (preparecnt))
		1206	{
		1207	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
474	call_pending ();	1208	call_pending (EV_A);
475	}	1209	}
476		1210
477	do	1211	/* we might have forked, so reify kernel state if necessary */
478	{	1212	if (expect_false (postfork))
		1213	loop_fork (EV_A);
		1214
479	/* update fd-related kernel structures */	1215	/* update fd-related kernel structures */
480	fd_reify ();	1216	fd_reify (EV_A);
481		1217
482	/* calculate blocking time */	1218	/* calculate blocking time */
		1219
		1220	/* we only need this for !monotonic clock or timers, but as we basically
		1221	always have timers, we just calculate it always */
		1222	#if EV_USE_MONOTONIC
		1223	if (expect_true (have_monotonic))
		1224	time_update_monotonic (EV_A);
		1225	else
		1226	#endif
		1227	{
		1228	ev_rt_now = ev_time ();
		1229	mn_now = ev_rt_now;
		1230	}
		1231
483	if (flags & EVLOOP_NONBLOCK || idlecnt)	1232	if (flags & EVLOOP_NONBLOCK || idlecnt)
484	block = 0.;	1233	block = 0.;
485	else	1234	else
486	{	1235	{
487	block = MAX_BLOCKTIME;	1236	block = MAX_BLOCKTIME;
488		1237
489	if (rtimercnt)	1238	if (timercnt)
490	{	1239	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1240	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
492	if (block > to) block = to;	1241	if (block > to) block = to;
493	}	1242	}
494		1243
		1244	#if EV_PERIODICS
495	if (atimercnt)	1245	if (periodiccnt)
496	{	1246	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1247	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
498	if (block > to) block = to;	1248	if (block > to) block = to;
499	}	1249	}
		1250	#endif
500		1251
501	if (block < 0.) block = 0.;	1252	if (expect_false (block < 0.)) block = 0.;
502	}	1253	}
503		1254
504	method_poll (block);	1255	method_poll (EV_A_ block);
505		1256
506	/* update ev_now, do magic */	1257	/* update ev_rt_now, do magic */
507	time_update ();	1258	time_update (EV_A);
508		1259
509	/* queue pending timers and reschedule them */	1260	/* queue pending timers and reschedule them */
510	/* absolute timers first */	1261	timers_reify (EV_A); /* relative timers called last */
511	timers_reify (atimers, atimercnt, ev_now);	1262	#if EV_PERIODICS
512	/* relative timers second */	1263	periodics_reify (EV_A); /* absolute timers called first */
513	timers_reify (rtimers, rtimercnt, now);	1264	#endif
514		1265
515	/* queue idle watchers unless io or timers are pending */	1266	/* queue idle watchers unless io or timers are pending */
516	if (!pendingcnt)	1267	if (idlecnt && !any_pending (EV_A))
517	queue_events (idles, idlecnt, EV_IDLE);	1268	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
518		1269
519	/* queue check and possibly idle watchers */	1270	/* queue check watchers, to be executed first */
		1271	if (expect_false (checkcnt))
520	queue_events (checks, checkcnt, EV_CHECK);	1272	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
521		1273
522	call_pending ();	1274	call_pending (EV_A);
		1275
		1276	if (expect_false (loop_done))
		1277	break;
523	}	1278	}
524	while (!ev_loop_done);	1279
		1280	if (loop_done != 2)
		1281	loop_done = 0;
		1282	}
		1283
		1284	void
		1285	ev_unloop (EV_P_ int how)
		1286	{
		1287	loop_done = how;
525	}	1288	}
526		1289
527	/*****************************************************************************/	1290	/*****************************************************************************/
528		1291
529	static void	1292	inline void
530	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1293	wlist_add (WL *head, WL elem)
531	{	1294	{
532	elem->next = *head;	1295	elem->next = *head;
533	*head = elem;	1296	*head = elem;
534	}	1297	}
535		1298
536	static void	1299	inline void
537	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1300	wlist_del (WL *head, WL elem)
538	{	1301	{
539	while (*head)	1302	while (*head)
540	{	1303	{
541	if (*head == elem)	1304	if (*head == elem)
542	{	1305	{
…		…
546		1309
547	head = &(*head)->next;	1310	head = &(*head)->next;
548	}	1311	}
549	}	1312	}
550		1313
551	static void	1314	inline void
552	ev_start (struct ev_watcher *w, int active)	1315	ev_clear_pending (EV_P_ W w)
553	{	1316	{
		1317	if (w->pending)
		1318	{
		1319	pendings [ABSPRI (w)][w->pending - 1].w = 0;
554	w->pending = 0;	1320	w->pending = 0;
		1321	}
		1322	}
		1323
		1324	inline void
		1325	ev_start (EV_P_ W w, int active)
		1326	{
		1327	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1328	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1329
555	w->active = active;	1330	w->active = active;
		1331	ev_ref (EV_A);
556	}	1332	}
557		1333
558	static void	1334	inline void
559	ev_stop (struct ev_watcher *w)	1335	ev_stop (EV_P_ W w)
560	{	1336	{
561	if (w->pending)	1337	ev_unref (EV_A);
562	pendings [w->pending - 1].w = 0;
563
564	w->active = 0;	1338	w->active = 0;
565	/* nop */
566	}	1339	}
567		1340
568	/*****************************************************************************/	1341	/*****************************************************************************/
569		1342
570	void	1343	void
571	evio_start (struct ev_io *w)	1344	ev_io_start (EV_P_ struct ev_io *w)
		1345	{
		1346	int fd = w->fd;
		1347
		1348	if (expect_false (ev_is_active (w)))
		1349	return;
		1350
		1351	assert (("ev_io_start called with negative fd", fd >= 0));
		1352
		1353	ev_start (EV_A_ (W)w, 1);
		1354	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1355	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1356
		1357	fd_change (EV_A_ fd);
		1358	}
		1359
		1360	void
		1361	ev_io_stop (EV_P_ struct ev_io *w)
		1362	{
		1363	ev_clear_pending (EV_A_ (W)w);
		1364	if (expect_false (!ev_is_active (w)))
		1365	return;
		1366
		1367	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1368
		1369	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1370	ev_stop (EV_A_ (W)w);
		1371
		1372	fd_change (EV_A_ w->fd);
		1373	}
		1374
		1375	void
		1376	ev_timer_start (EV_P_ struct ev_timer *w)
		1377	{
		1378	if (expect_false (ev_is_active (w)))
		1379	return;
		1380
		1381	((WT)w)->at += mn_now;
		1382
		1383	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1384
		1385	ev_start (EV_A_ (W)w, ++timercnt);
		1386	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1387	timers [timercnt - 1] = w;
		1388	upheap ((WT *)timers, timercnt - 1);
		1389
		1390	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1391	}
		1392
		1393	void
		1394	ev_timer_stop (EV_P_ struct ev_timer *w)
		1395	{
		1396	ev_clear_pending (EV_A_ (W)w);
		1397	if (expect_false (!ev_is_active (w)))
		1398	return;
		1399
		1400	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1401
		1402	if (expect_true (((W)w)->active < timercnt--))
		1403	{
		1404	timers [((W)w)->active - 1] = timers [timercnt];
		1405	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1406	}
		1407
		1408	((WT)w)->at -= mn_now;
		1409
		1410	ev_stop (EV_A_ (W)w);
		1411	}
		1412
		1413	void
		1414	ev_timer_again (EV_P_ struct ev_timer *w)
572	{	1415	{
573	if (ev_is_active (w))	1416	if (ev_is_active (w))
574	return;
575
576	int fd = w->fd;
577
578	ev_start ((struct ev_watcher *)w, 1);
579	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
580	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
581
582	++fdchangecnt;
583	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584	fdchanges [fdchangecnt - 1] = fd;
585	}
586
587	void
588	evio_stop (struct ev_io *w)
589	{
590	if (!ev_is_active (w))
591	return;
592
593	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
594	ev_stop ((struct ev_watcher *)w);
595
596	++fdchangecnt;
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = w->fd;
599	}
600
601	void
602	evtimer_start (struct ev_timer *w)
603	{
604	if (ev_is_active (w))
605	return;
606
607	if (w->is_abs)
608	{	1417	{
609	/* this formula differs from the one in timer_reify becuse we do not round up */
610	if (w->repeat)	1418	if (w->repeat)
611	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
612
613	ev_start ((struct ev_watcher *)w, ++atimercnt);
614	array_needsize (atimers, atimermax, atimercnt, );
615	atimers [atimercnt - 1] = w;
616	upheap (atimers, atimercnt - 1);
617	}
618	else
619	{
620	w->at += now;
621
622	ev_start ((struct ev_watcher *)w, ++rtimercnt);
623	array_needsize (rtimers, rtimermax, rtimercnt, );
624	rtimers [rtimercnt - 1] = w;
625	upheap (rtimers, rtimercnt - 1);
626	}
627
628	}
629
630	void
631	evtimer_stop (struct ev_timer *w)
632	{
633	if (!ev_is_active (w))
634	return;
635
636	if (w->is_abs)
637	{
638	if (w->active < atimercnt--)
639	{	1419	{
640	atimers [w->active - 1] = atimers [atimercnt];	1420	((WT)w)->at = mn_now + w->repeat;
641	downheap (atimers, atimercnt, w->active - 1);	1421	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
642	}	1422	}
643	}
644	else	1423	else
		1424	ev_timer_stop (EV_A_ w);
645	{	1425	}
646	if (w->active < rtimercnt--)	1426	else if (w->repeat)
647	{
648	rtimers [w->active - 1] = rtimers [rtimercnt];
649	downheap (rtimers, rtimercnt, w->active - 1);
650	}
651	}	1427	{
652		1428	w->at = w->repeat;
653	ev_stop ((struct ev_watcher *)w);	1429	ev_timer_start (EV_A_ w);
		1430	}
654	}	1431	}
655		1432
		1433	#if EV_PERIODICS
656	void	1434	void
		1435	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1436	{
		1437	if (expect_false (ev_is_active (w)))
		1438	return;
		1439
		1440	if (w->reschedule_cb)
		1441	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1442	else if (w->interval)
		1443	{
		1444	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1445	/* this formula differs from the one in periodic_reify because we do not always round up */
		1446	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1447	}
		1448
		1449	ev_start (EV_A_ (W)w, ++periodiccnt);
		1450	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1451	periodics [periodiccnt - 1] = w;
		1452	upheap ((WT *)periodics, periodiccnt - 1);
		1453
		1454	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1455	}
		1456
		1457	void
		1458	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1459	{
		1460	ev_clear_pending (EV_A_ (W)w);
		1461	if (expect_false (!ev_is_active (w)))
		1462	return;
		1463
		1464	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1465
		1466	if (expect_true (((W)w)->active < periodiccnt--))
		1467	{
		1468	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1469	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1470	}
		1471
		1472	ev_stop (EV_A_ (W)w);
		1473	}
		1474
		1475	void
		1476	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1477	{
		1478	/* TODO: use adjustheap and recalculation */
		1479	ev_periodic_stop (EV_A_ w);
		1480	ev_periodic_start (EV_A_ w);
		1481	}
		1482	#endif
		1483
		1484	void
		1485	ev_idle_start (EV_P_ struct ev_idle *w)
		1486	{
		1487	if (expect_false (ev_is_active (w)))
		1488	return;
		1489
		1490	ev_start (EV_A_ (W)w, ++idlecnt);
		1491	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1492	idles [idlecnt - 1] = w;
		1493	}
		1494
		1495	void
		1496	ev_idle_stop (EV_P_ struct ev_idle *w)
		1497	{
		1498	ev_clear_pending (EV_A_ (W)w);
		1499	if (expect_false (!ev_is_active (w)))
		1500	return;
		1501
		1502	idles [((W)w)->active - 1] = idles [--idlecnt];
		1503	ev_stop (EV_A_ (W)w);
		1504	}
		1505
		1506	void
		1507	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1508	{
		1509	if (expect_false (ev_is_active (w)))
		1510	return;
		1511
		1512	ev_start (EV_A_ (W)w, ++preparecnt);
		1513	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1514	prepares [preparecnt - 1] = w;
		1515	}
		1516
		1517	void
		1518	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1519	{
		1520	ev_clear_pending (EV_A_ (W)w);
		1521	if (expect_false (!ev_is_active (w)))
		1522	return;
		1523
		1524	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1525	ev_stop (EV_A_ (W)w);
		1526	}
		1527
		1528	void
		1529	ev_check_start (EV_P_ struct ev_check *w)
		1530	{
		1531	if (expect_false (ev_is_active (w)))
		1532	return;
		1533
		1534	ev_start (EV_A_ (W)w, ++checkcnt);
		1535	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1536	checks [checkcnt - 1] = w;
		1537	}
		1538
		1539	void
		1540	ev_check_stop (EV_P_ struct ev_check *w)
		1541	{
		1542	ev_clear_pending (EV_A_ (W)w);
		1543	if (expect_false (!ev_is_active (w)))
		1544	return;
		1545
		1546	checks [((W)w)->active - 1] = checks [--checkcnt];
		1547	ev_stop (EV_A_ (W)w);
		1548	}
		1549
		1550	#ifndef SA_RESTART
		1551	# define SA_RESTART 0
		1552	#endif
		1553
		1554	void
657	evsignal_start (struct ev_signal *w)	1555	ev_signal_start (EV_P_ struct ev_signal *w)
658	{	1556	{
		1557	#if EV_MULTIPLICITY
		1558	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1559	#endif
659	if (ev_is_active (w))	1560	if (expect_false (ev_is_active (w)))
660	return;	1561	return;
661		1562
662	ev_start ((struct ev_watcher *)w, 1);	1563	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1564
		1565	ev_start (EV_A_ (W)w, 1);
663	array_needsize (signals, signalmax, w->signum, signals_init);	1566	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
664	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1567	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
665		1568
666	if (!w->next)	1569	if (!((WL)w)->next)
667	{	1570	{
		1571	#if _WIN32
		1572	signal (w->signum, sighandler);
		1573	#else
668	struct sigaction sa;	1574	struct sigaction sa;
669	sa.sa_handler = sighandler;	1575	sa.sa_handler = sighandler;
670	sigfillset (&sa.sa_mask);	1576	sigfillset (&sa.sa_mask);
671	sa.sa_flags = 0;	1577	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
672	sigaction (w->signum, &sa, 0);	1578	sigaction (w->signum, &sa, 0);
		1579	#endif
673	}	1580	}
674	}	1581	}
675		1582
676	void	1583	void
677	evsignal_stop (struct ev_signal *w)	1584	ev_signal_stop (EV_P_ struct ev_signal *w)
678	{	1585	{
		1586	ev_clear_pending (EV_A_ (W)w);
679	if (!ev_is_active (w))	1587	if (expect_false (!ev_is_active (w)))
680	return;	1588	return;
681		1589
682	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1590	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
683	ev_stop ((struct ev_watcher *)w);	1591	ev_stop (EV_A_ (W)w);
684		1592
685	if (!signals [w->signum - 1].head)	1593	if (!signals [w->signum - 1].head)
686	signal (w->signum, SIG_DFL);	1594	signal (w->signum, SIG_DFL);
687	}	1595	}
688		1596
689	void evidle_start (struct ev_idle *w)	1597	void
		1598	ev_child_start (EV_P_ struct ev_child *w)
690	{	1599	{
		1600	#if EV_MULTIPLICITY
		1601	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1602	#endif
691	if (ev_is_active (w))	1603	if (expect_false (ev_is_active (w)))
692	return;	1604	return;
693		1605
694	ev_start ((struct ev_watcher *)w, ++idlecnt);	1606	ev_start (EV_A_ (W)w, 1);
695	array_needsize (idles, idlemax, idlecnt, );	1607	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
696	idles [idlecnt - 1] = w;
697	}	1608	}
698		1609
699	void evidle_stop (struct ev_idle *w)	1610	void
		1611	ev_child_stop (EV_P_ struct ev_child *w)
700	{	1612	{
701	idles [w->active - 1] = idles [--idlecnt];	1613	ev_clear_pending (EV_A_ (W)w);
702	ev_stop ((struct ev_watcher *)w);	1614	if (expect_false (!ev_is_active (w)))
703	}
704
705	void evcheck_start (struct ev_check *w)
706	{
707	if (ev_is_active (w))
708	return;	1615	return;
709		1616
710	ev_start ((struct ev_watcher *)w, ++checkcnt);	1617	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
711	array_needsize (checks, checkmax, checkcnt, );	1618	ev_stop (EV_A_ (W)w);
712	checks [checkcnt - 1] = w;
713	}
714
715	void evcheck_stop (struct ev_check *w)
716	{
717	checks [w->active - 1] = checks [--checkcnt];
718	ev_stop ((struct ev_watcher *)w);
719	}	1619	}
720		1620
721	/*****************************************************************************/	1621	/*****************************************************************************/
722	#if 1
723		1622
724	static void	1623	struct ev_once
725	sin_cb (struct ev_io *w, int revents)
726	{	1624	{
727	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
728	}
729
730	static void
731	ocb (struct ev_timer *w, int revents)
732	{
733	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
734	evtimer_stop (w);
735	evtimer_start (w);
736	}
737
738	static void
739	scb (struct ev_signal *w, int revents)
740	{
741	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
742	}
743
744	static void
745	gcb (struct ev_signal *w, int revents)
746	{
747	fprintf (stderr, "generic %x\n", revents);
748	}
749
750	int main (void)
751	{
752	struct ev_io sin;	1625	struct ev_io io;
753
754	ev_init (0);
755
756	evw_init (&sin, sin_cb, 55);
757	evio_set (&sin, 0, EV_READ);
758	evio_start (&sin);
759
760	struct ev_timer t[10000];
761
762	#if 0
763	int i;
764	for (i = 0; i < 10000; ++i)
765	{
766	struct ev_timer *w = t + i;
767	evw_init (w, ocb, i);
768	evtimer_set_abs (w, drand48 (), 0.99775533);
769	evtimer_start (w);
770	if (drand48 () < 0.5)
771	evtimer_stop (w);
772	}
773	#endif
774
775	struct ev_timer t1;	1626	struct ev_timer to;
776	evw_init (&t1, ocb, 0);	1627	void (*cb)(int revents, void *arg);
777	evtimer_set_abs (&t1, 5, 10);	1628	void *arg;
778	evtimer_start (&t1);	1629	};
779		1630
780	struct ev_signal sig;	1631	static void
781	evw_init (&sig, scb, 65535);	1632	once_cb (EV_P_ struct ev_once *once, int revents)
782	evsignal_set (&sig, SIGQUIT);	1633	{
783	evsignal_start (&sig);	1634	void (*cb)(int revents, void *arg) = once->cb;
		1635	void *arg = once->arg;
784		1636
785	struct ev_check cw;	1637	ev_io_stop (EV_A_ &once->io);
786	evw_init (&cw, gcb, 0);	1638	ev_timer_stop (EV_A_ &once->to);
787	evcheck_start (&cw);	1639	ev_free (once);
788		1640
789	struct ev_idle iw;	1641	cb (revents, arg);
790	evw_init (&iw, gcb, 0);	1642	}
791	evidle_start (&iw);
792		1643
793	ev_loop (0);	1644	static void
		1645	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1646	{
		1647	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1648	}
794		1649
		1650	static void
		1651	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1652	{
		1653	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1654	}
		1655
		1656	void
		1657	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1658	{
		1659	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1660
		1661	if (expect_false (!once))
		1662	{
		1663	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
795	return 0;	1664	return;
796	}	1665	}
797		1666
798	#endif	1667	once->cb = cb;
		1668	once->arg = arg;
799		1669
		1670	ev_init (&once->io, once_cb_io);
		1671	if (fd >= 0)
		1672	{
		1673	ev_io_set (&once->io, fd, events);
		1674	ev_io_start (EV_A_ &once->io);
		1675	}
800		1676
		1677	ev_init (&once->to, once_cb_to);
		1678	if (timeout >= 0.)
		1679	{
		1680	ev_timer_set (&once->to, timeout, 0.);
		1681	ev_timer_start (EV_A_ &once->to);
		1682	}
		1683	}
801		1684
		1685	#ifdef __cplusplus
		1686	}
		1687	#endif
802		1688

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