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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.134 by root, Fri Nov 23 19:13:33 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	# ifdef EV_CONFIG_H
		38	# include EV_CONFIG_H
		39	# else
		40	# include "config.h"
		41	# endif
		42
		43	# if HAVE_CLOCK_GETTIME
		44	# ifndef EV_USE_MONOTONIC
		45	# define EV_USE_MONOTONIC 1
		46	# endif
		47	# ifndef EV_USE_REALTIME
		48	# define EV_USE_REALTIME 1
		49	# endif
		50	# else
		51	# ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 0
		53	# endif
		54	# ifndef EV_USE_REALTIME
		55	# define EV_USE_REALTIME 0
		56	# endif
		57	# endif
		58
		59	# ifndef EV_USE_SELECT
		60	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		61	# define EV_USE_SELECT 1
		62	# else
		63	# define EV_USE_SELECT 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_POLL
		68	# if HAVE_POLL && HAVE_POLL_H
		69	# define EV_USE_POLL 1
		70	# else
		71	# define EV_USE_POLL 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_EPOLL
		76	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		77	# define EV_USE_EPOLL 1
		78	# else
		79	# define EV_USE_EPOLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_KQUEUE
		84	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		85	# define EV_USE_KQUEUE 1
		86	# else
		87	# define EV_USE_KQUEUE 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_PORT
		92	# if HAVE_PORT_H && HAVE_PORT_CREATE
		93	# define EV_USE_PORT 1
		94	# else
		95	# define EV_USE_PORT 0
		96	# endif
		97	# endif
		98
		99	#endif
		100
1	#include <math.h>	101	#include <math.h>
2	#include <stdlib.h>	102	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	103	#include <fcntl.h>
5	#include <signal.h>	104	#include <stddef.h>
6		105
7	#include <stdio.h>	106	#include <stdio.h>
8		107
9	#include <assert.h>	108	#include <assert.h>
10	#include <errno.h>	109	#include <errno.h>
11	#include <sys/time.h>	110	#include <sys/types.h>
12	#include <time.h>	111	#include <time.h>
13		112
		113	#include <signal.h>
		114
		115	#ifndef _WIN32
		116	# include <unistd.h>
		117	# include <sys/time.h>
		118	# include <sys/wait.h>
		119	#else
		120	# define WIN32_LEAN_AND_MEAN
		121	# include <windows.h>
		122	# ifndef EV_SELECT_IS_WINSOCKET
		123	# define EV_SELECT_IS_WINSOCKET 1
		124	# endif
		125	#endif
		126
		127	/**/
		128
		129	#ifndef EV_USE_MONOTONIC
		130	# define EV_USE_MONOTONIC 0
		131	#endif
		132
		133	#ifndef EV_USE_REALTIME
		134	# define EV_USE_REALTIME 0
		135	#endif
		136
		137	#ifndef EV_USE_SELECT
		138	# define EV_USE_SELECT 1
		139	#endif
		140
		141	#ifndef EV_USE_POLL
		142	# ifdef _WIN32
		143	# define EV_USE_POLL 0
		144	# else
		145	# define EV_USE_POLL 1
		146	# endif
		147	#endif
		148
		149	#ifndef EV_USE_EPOLL
		150	# define EV_USE_EPOLL 0
		151	#endif
		152
		153	#ifndef EV_USE_KQUEUE
		154	# define EV_USE_KQUEUE 0
		155	#endif
		156
		157	#ifndef EV_USE_PORT
		158	# define EV_USE_PORT 0
		159	#endif
		160
		161	/**/
		162
14	#ifdef CLOCK_MONOTONIC	163	#ifndef CLOCK_MONOTONIC
		164	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	165	# define EV_USE_MONOTONIC 0
16	#endif	166	#endif
17		167
		168	#ifndef CLOCK_REALTIME
		169	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	170	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	171	#endif
20	#define HAVE_SELECT 1	172
		173	#if EV_SELECT_IS_WINSOCKET
		174	# include <winsock.h>
		175	#endif
		176
		177	/**/
21		178
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	179	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	180	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		181	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		182	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
24		183
		184	#ifdef EV_H
		185	# include EV_H
		186	#else
25	#include "ev.h"	187	# include "ev.h"
		188	#endif
26		189
		190	#if __GNUC__ >= 3
		191	# define expect(expr,value) __builtin_expect ((expr),(value))
		192	# define inline static inline
		193	#else
		194	# define expect(expr,value) (expr)
		195	# define inline static
		196	#endif
		197
		198	#define expect_false(expr) expect ((expr) != 0, 0)
		199	#define expect_true(expr) expect ((expr) != 0, 1)
		200
		201	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		202	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		203
		204	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		205	#define EMPTY2(a,b) /* used to suppress some warnings */
		206
27	struct ev_watcher {	207	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	208	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	209	typedef struct ev_watcher_time *WT;
33	};
34		210
35	static ev_tstamp now, diff; /* monotonic clock */	211	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		212
		213	#ifdef _WIN32
		214	# include "ev_win32.c"
		215	#endif
		216
		217	/*****************************************************************************/
		218
		219	static void (*syserr_cb)(const char *msg);
		220
		221	void ev_set_syserr_cb (void (*cb)(const char *msg))
		222	{
		223	syserr_cb = cb;
		224	}
		225
		226	static void
		227	syserr (const char *msg)
		228	{
		229	if (!msg)
		230	msg = "(libev) system error";
		231
		232	if (syserr_cb)
		233	syserr_cb (msg);
		234	else
		235	{
		236	perror (msg);
		237	abort ();
		238	}
		239	}
		240
		241	static void *(*alloc)(void *ptr, long size);
		242
		243	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		244	{
		245	alloc = cb;
		246	}
		247
		248	static void *
		249	ev_realloc (void *ptr, long size)
		250	{
		251	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		252
		253	if (!ptr && size)
		254	{
		255	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		256	abort ();
		257	}
		258
		259	return ptr;
		260	}
		261
		262	#define ev_malloc(size) ev_realloc (0, (size))
		263	#define ev_free(ptr) ev_realloc ((ptr), 0)
		264
		265	/*****************************************************************************/
		266
		267	typedef struct
		268	{
		269	WL head;
		270	unsigned char events;
		271	unsigned char reify;
		272	#if EV_SELECT_IS_WINSOCKET
		273	SOCKET handle;
		274	#endif
		275	} ANFD;
		276
		277	typedef struct
		278	{
		279	W w;
		280	int events;
		281	} ANPENDING;
		282
		283	#if EV_MULTIPLICITY
		284
		285	struct ev_loop
		286	{
		287	ev_tstamp ev_rt_now;
		288	#define ev_rt_now ((loop)->ev_rt_now)
		289	#define VAR(name,decl) decl;
		290	#include "ev_vars.h"
		291	#undef VAR
		292	};
		293	#include "ev_wrap.h"
		294
		295	static struct ev_loop default_loop_struct;
		296	struct ev_loop *ev_default_loop_ptr;
		297
		298	#else
		299
36	ev_tstamp ev_now;	300	ev_tstamp ev_rt_now;
37	int ev_method;	301	#define VAR(name,decl) static decl;
		302	#include "ev_vars.h"
		303	#undef VAR
38		304
39	static int have_monotonic; /* runtime */	305	static int ev_default_loop_ptr;
40		306
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	307	#endif
42	static void (*method_modify)(int fd, int oev, int nev);	308
43	static void (*method_poll)(ev_tstamp timeout);	309	/*****************************************************************************/
44		310
45	ev_tstamp	311	ev_tstamp
46	ev_time (void)	312	ev_time (void)
47	{	313	{
48	#if HAVE_REALTIME	314	#if EV_USE_REALTIME
49	struct timespec ts;	315	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	316	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	317	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	318	#else
53	struct timeval tv;	319	struct timeval tv;
54	gettimeofday (&tv, 0);	320	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	321	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	322	#endif
57	}	323	}
58		324
59	static ev_tstamp	325	inline ev_tstamp
60	get_clock (void)	326	get_clock (void)
61	{	327	{
62	#if HAVE_MONOTONIC	328	#if EV_USE_MONOTONIC
63	if (have_monotonic)	329	if (expect_true (have_monotonic))
64	{	330	{
65	struct timespec ts;	331	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	332	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	333	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	334	}
69	#endif	335	#endif
70		336
71	return ev_time ();	337	return ev_time ();
72	}	338	}
73		339
		340	#if EV_MULTIPLICITY
		341	ev_tstamp
		342	ev_now (EV_P)
		343	{
		344	return ev_rt_now;
		345	}
		346	#endif
		347
		348	#define array_roundsize(type,n) (((n) | 4) & ~3)
		349
74	#define array_needsize(base,cur,cnt,init) \	350	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	351	if (expect_false ((cnt) > cur)) \
76	{ \	352	{ \
77	int newcnt = cur ? cur << 1 : 16; \	353	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	354	do \
		355	{ \
		356	newcnt = array_roundsize (type, newcnt << 1); \
		357	} \
		358	while ((cnt) > newcnt); \
		359	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	360	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
80	init (base + cur, newcnt - cur); \	361	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	362	cur = newcnt; \
82	}	363	}
83		364
84	typedef struct	365	#define array_slim(type,stem) \
85	{	366	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	367	{ \
87	unsigned char wev, rev; /* want, received event set */	368	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	369	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		370	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		371	}
89		372
90	static ANFD *anfds;	373	#define array_free(stem, idx) \
91	static int anfdmax;	374	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
92		375
93	static int *fdchanges;	376	/*****************************************************************************/
94	static int fdchangemax, fdchangecnt;
95		377
96	static void	378	static void
97	anfds_init (ANFD *base, int count)	379	anfds_init (ANFD *base, int count)
98	{	380	{
99	while (count--)	381	while (count--)
100	{	382	{
101	base->head = 0;	383	base->head = 0;
102	base->wev = base->rev = EV_NONE;	384	base->events = EV_NONE;
		385	base->reify = 0;
		386
103	++base;	387	++base;
104	}	388	}
105	}	389	}
106		390
107	typedef struct	391	void
		392	ev_feed_event (EV_P_ void *w, int revents)
108	{	393	{
109	struct ev_watcher *w;	394	W w_ = (W)w;
110	int events;
111	} ANPENDING;
112		395
113	static ANPENDING *pendings;	396	if (expect_false (w_->pending))
114	static int pendingmax, pendingcnt;	397	{
		398	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		399	return;
		400	}
115		401
116	static void	402	if (expect_false (!w_->cb))
117	event (struct ev_watcher *w, int events)	403	return;
118	{	404
119	w->pending = ++pendingcnt;	405	w_->pending = ++pendingcnt [ABSPRI (w_)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	406	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
121	pendings [pendingcnt - 1].w = w;	407	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
122	pendings [pendingcnt - 1].events = events;	408	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
123	}	409	}
124		410
125	static void	411	static void
		412	queue_events (EV_P_ W *events, int eventcnt, int type)
		413	{
		414	int i;
		415
		416	for (i = 0; i < eventcnt; ++i)
		417	ev_feed_event (EV_A_ events [i], type);
		418	}
		419
		420	inline void
126	fd_event (int fd, int events)	421	fd_event (EV_P_ int fd, int revents)
127	{	422	{
128	ANFD *anfd = anfds + fd;	423	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	424	struct ev_io *w;
130		425
131	for (w = anfd->head; w; w = w->next)	426	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	427	{
133	int ev = w->events & events;	428	int ev = w->events & revents;
134		429
135	if (ev)	430	if (ev)
136	event ((struct ev_watcher *)w, ev);	431	ev_feed_event (EV_A_ (W)w, ev);
137	}
138	}
139
140	static struct ev_timer **atimers;
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void
147	upheap (struct ev_timer **timers, int k)
148	{
149	struct ev_timer *w = timers [k];
150
151	while (k && timers [k >> 1]->at > w->at)
152	{
153	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;
155	k >>= 1;
156	}
157
158	timers [k] = w;
159	timers [k]->active = k + 1;
160
161	}
162
163	static void
164	downheap (struct ev_timer **timers, int N, int k)
165	{
166	struct ev_timer *w = timers [k];
167
168	while (k < (N >> 1))
169	{
170	int j = k << 1;
171
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173	++j;
174
175	if (w->at <= timers [j]->at)
176	break;
177
178	timers [k] = timers [j];
179	timers [k]->active = k + 1;
180	k = j;
181	}
182
183	timers [k] = w;
184	timers [k]->active = k + 1;
185	}
186
187	typedef struct
188	{
189	struct ev_signal *head;
190	sig_atomic_t gotsig;
191	} ANSIG;
192
193	static ANSIG *signals;
194	static int signalmax;
195
196	static int sigpipe [2];
197	static sig_atomic_t gotsig;
198	static struct ev_io sigev;
199
200	static void
201	signals_init (ANSIG *base, int count)
202	{
203	while (count--)
204	{
205	base->head = 0;
206	base->gotsig = 0;
207	++base;
208	}
209	}
210
211	static void
212	sighandler (int signum)
213	{
214	signals [signum - 1].gotsig = 1;
215
216	if (!gotsig)
217	{
218	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);
220	}
221	}
222
223	static void
224	sigcb (struct ev_io *iow, int revents)
225	{
226	struct ev_signal *w;
227	int sig;
228
229	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231
232	for (sig = signalmax; sig--; )
233	if (signals [sig].gotsig)
234	{
235	signals [sig].gotsig = 0;
236
237	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);
239	}	432	}
240	}	433	}
241		434
242	static void	435	void
243	siginit (void)	436	ev_feed_fd_event (EV_P_ int fd, int revents)
244	{	437	{
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	438	fd_event (EV_A_ fd, revents);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247
248	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251
252	evio_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);
254	}	439	}
255		440
256	#if HAVE_EPOLL	441	/*****************************************************************************/
257	# include "ev_epoll.c"
258	#endif
259	#if HAVE_SELECT
260	# include "ev_select.c"
261	#endif
262		442
263	int ev_init (int flags)	443	inline void
264	{	444	fd_reify (EV_P)
265	#if HAVE_MONOTONIC
266	{
267	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;
270	}
271	#endif
272
273	ev_now = ev_time ();
274	now = get_clock ();
275	diff = ev_now - now;
276
277	if (pipe (sigpipe))
278	return 0;
279
280	ev_method = EVMETHOD_NONE;
281	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif
284	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif
287
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);
291	siginit ();
292	}
293
294	return ev_method;
295	}
296
297	void ev_prefork (void)
298	{
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void
320	fd_reify (void)
321	{	445	{
322	int i;	446	int i;
323		447
324	for (i = 0; i < fdchangecnt; ++i)	448	for (i = 0; i < fdchangecnt; ++i)
325	{	449	{
326	int fd = fdchanges [i];	450	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;	451	ANFD *anfd = anfds + fd;
328	struct ev_io *w;	452	struct ev_io *w;
329		453
330	int wev = 0;	454	int events = 0;
331		455
332	for (w = anfd->head; w; w = w->next)	456	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
333	wev |= w->events;	457	events |= w->events;
334		458
335	if (anfd->wev != wev)	459	#if EV_SELECT_IS_WINSOCKET
		460	if (events)
336	{	461	{
337	method_modify (fd, anfd->wev, wev);	462	unsigned long argp;
338	anfd->wev = wev;	463	anfd->handle = _get_osfhandle (fd);
		464	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
339	}	465	}
		466	#endif
		467
		468	anfd->reify = 0;
		469
		470	backend_modify (EV_A_ fd, anfd->events, events);
		471	anfd->events = events;
340	}	472	}
341		473
342	fdchangecnt = 0;	474	fdchangecnt = 0;
343	}	475	}
344		476
345	static void	477	static void
346	call_pending ()	478	fd_change (EV_P_ int fd)
		479	{
		480	if (expect_false (anfds [fd].reify))
		481	return;
		482
		483	anfds [fd].reify = 1;
		484
		485	++fdchangecnt;
		486	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		487	fdchanges [fdchangecnt - 1] = fd;
		488	}
		489
		490	static void
		491	fd_kill (EV_P_ int fd)
		492	{
		493	struct ev_io *w;
		494
		495	while ((w = (struct ev_io *)anfds [fd].head))
		496	{
		497	ev_io_stop (EV_A_ w);
		498	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		499	}
		500	}
		501
		502	inline int
		503	fd_valid (int fd)
		504	{
		505	#ifdef _WIN32
		506	return _get_osfhandle (fd) != -1;
		507	#else
		508	return fcntl (fd, F_GETFD) != -1;
		509	#endif
		510	}
		511
		512	/* called on EBADF to verify fds */
		513	static void
		514	fd_ebadf (EV_P)
		515	{
		516	int fd;
		517
		518	for (fd = 0; fd < anfdmax; ++fd)
		519	if (anfds [fd].events)
		520	if (!fd_valid (fd) == -1 && errno == EBADF)
		521	fd_kill (EV_A_ fd);
		522	}
		523
		524	/* called on ENOMEM in select/poll to kill some fds and retry */
		525	static void
		526	fd_enomem (EV_P)
		527	{
		528	int fd;
		529
		530	for (fd = anfdmax; fd--; )
		531	if (anfds [fd].events)
		532	{
		533	fd_kill (EV_A_ fd);
		534	return;
		535	}
		536	}
		537
		538	/* usually called after fork if backend needs to re-arm all fds from scratch */
		539	static void
		540	fd_rearm_all (EV_P)
		541	{
		542	int fd;
		543
		544	/* this should be highly optimised to not do anything but set a flag */
		545	for (fd = 0; fd < anfdmax; ++fd)
		546	if (anfds [fd].events)
		547	{
		548	anfds [fd].events = 0;
		549	fd_change (EV_A_ fd);
		550	}
		551	}
		552
		553	/*****************************************************************************/
		554
		555	static void
		556	upheap (WT *heap, int k)
		557	{
		558	WT w = heap [k];
		559
		560	while (k && heap [k >> 1]->at > w->at)
		561	{
		562	heap [k] = heap [k >> 1];
		563	((W)heap [k])->active = k + 1;
		564	k >>= 1;
		565	}
		566
		567	heap [k] = w;
		568	((W)heap [k])->active = k + 1;
		569
		570	}
		571
		572	static void
		573	downheap (WT *heap, int N, int k)
		574	{
		575	WT w = heap [k];
		576
		577	while (k < (N >> 1))
		578	{
		579	int j = k << 1;
		580
		581	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		582	++j;
		583
		584	if (w->at <= heap [j]->at)
		585	break;
		586
		587	heap [k] = heap [j];
		588	((W)heap [k])->active = k + 1;
		589	k = j;
		590	}
		591
		592	heap [k] = w;
		593	((W)heap [k])->active = k + 1;
		594	}
		595
		596	inline void
		597	adjustheap (WT *heap, int N, int k)
		598	{
		599	upheap (heap, k);
		600	downheap (heap, N, k);
		601	}
		602
		603	/*****************************************************************************/
		604
		605	typedef struct
		606	{
		607	WL head;
		608	sig_atomic_t volatile gotsig;
		609	} ANSIG;
		610
		611	static ANSIG *signals;
		612	static int signalmax;
		613
		614	static int sigpipe [2];
		615	static sig_atomic_t volatile gotsig;
		616	static struct ev_io sigev;
		617
		618	static void
		619	signals_init (ANSIG *base, int count)
		620	{
		621	while (count--)
		622	{
		623	base->head = 0;
		624	base->gotsig = 0;
		625
		626	++base;
		627	}
		628	}
		629
		630	static void
		631	sighandler (int signum)
		632	{
		633	#if _WIN32
		634	signal (signum, sighandler);
		635	#endif
		636
		637	signals [signum - 1].gotsig = 1;
		638
		639	if (!gotsig)
		640	{
		641	int old_errno = errno;
		642	gotsig = 1;
		643	write (sigpipe [1], &signum, 1);
		644	errno = old_errno;
		645	}
		646	}
		647
		648	void
		649	ev_feed_signal_event (EV_P_ int signum)
		650	{
		651	WL w;
		652
		653	#if EV_MULTIPLICITY
		654	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		655	#endif
		656
		657	--signum;
		658
		659	if (signum < 0 || signum >= signalmax)
		660	return;
		661
		662	signals [signum].gotsig = 0;
		663
		664	for (w = signals [signum].head; w; w = w->next)
		665	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		666	}
		667
		668	static void
		669	sigcb (EV_P_ struct ev_io *iow, int revents)
		670	{
		671	int signum;
		672
		673	read (sigpipe [0], &revents, 1);
		674	gotsig = 0;
		675
		676	for (signum = signalmax; signum--; )
		677	if (signals [signum].gotsig)
		678	ev_feed_signal_event (EV_A_ signum + 1);
		679	}
		680
		681	static void
		682	fd_intern (int fd)
		683	{
		684	#ifdef _WIN32
		685	int arg = 1;
		686	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		687	#else
		688	fcntl (fd, F_SETFD, FD_CLOEXEC);
		689	fcntl (fd, F_SETFL, O_NONBLOCK);
		690	#endif
		691	}
		692
		693	static void
		694	siginit (EV_P)
		695	{
		696	fd_intern (sigpipe [0]);
		697	fd_intern (sigpipe [1]);
		698
		699	ev_io_set (&sigev, sigpipe [0], EV_READ);
		700	ev_io_start (EV_A_ &sigev);
		701	ev_unref (EV_A); /* child watcher should not keep loop alive */
		702	}
		703
		704	/*****************************************************************************/
		705
		706	static struct ev_child *childs [PID_HASHSIZE];
		707
		708	#ifndef _WIN32
		709
		710	static struct ev_signal childev;
		711
		712	#ifndef WCONTINUED
		713	# define WCONTINUED 0
		714	#endif
		715
		716	static void
		717	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		718	{
		719	struct ev_child *w;
		720
		721	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		722	if (w->pid == pid || !w->pid)
		723	{
		724	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		725	w->rpid = pid;
		726	w->rstatus = status;
		727	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		728	}
		729	}
		730
		731	static void
		732	childcb (EV_P_ struct ev_signal *sw, int revents)
		733	{
		734	int pid, status;
		735
		736	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		737	{
		738	/* make sure we are called again until all childs have been reaped */
		739	/* we need to do it this way so that the callback gets called before we continue */
		740	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		741
		742	child_reap (EV_A_ sw, pid, pid, status);
		743	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		744	}
		745	}
		746
		747	#endif
		748
		749	/*****************************************************************************/
		750
		751	#if EV_USE_PORT
		752	# include "ev_port.c"
		753	#endif
		754	#if EV_USE_KQUEUE
		755	# include "ev_kqueue.c"
		756	#endif
		757	#if EV_USE_EPOLL
		758	# include "ev_epoll.c"
		759	#endif
		760	#if EV_USE_POLL
		761	# include "ev_poll.c"
		762	#endif
		763	#if EV_USE_SELECT
		764	# include "ev_select.c"
		765	#endif
		766
		767	int
		768	ev_version_major (void)
		769	{
		770	return EV_VERSION_MAJOR;
		771	}
		772
		773	int
		774	ev_version_minor (void)
		775	{
		776	return EV_VERSION_MINOR;
		777	}
		778
		779	/* return true if we are running with elevated privileges and should ignore env variables */
		780	static int
		781	enable_secure (void)
		782	{
		783	#ifdef _WIN32
		784	return 0;
		785	#else
		786	return getuid () != geteuid ()
		787	|| getgid () != getegid ();
		788	#endif
		789	}
		790
		791	unsigned int
		792	ev_supported_backends (void)
		793	{
		794	unsigned int flags = 0;
		795
		796	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		797	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		798	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		799	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		800	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		801
		802	return flags;
		803	}
		804
		805	unsigned int
		806	ev_recommended_backends (void)
		807	{
		808	unsigned int flags = ev_supported_backends ();
		809
		810	#ifndef __NetBSD__
		811	/* kqueue is borked on everything but netbsd apparently */
		812	/* it usually doesn't work correctly on anything but sockets and pipes */
		813	flags &= ~EVBACKEND_KQUEUE;
		814	#endif
		815	#ifdef __APPLE__
		816	// flags &= ~EVBACKEND_KQUEUE; for documentation
		817	flags &= ~EVBACKEND_POLL;
		818	#endif
		819
		820	return flags;
		821	}
		822
		823	unsigned int
		824	ev_embeddable_backends (void)
		825	{
		826	return EVBACKEND_EPOLL
		827	| EVBACKEND_KQUEUE
		828	| EVBACKEND_PORT;
		829	}
		830
		831	unsigned int
		832	ev_backend (EV_P)
		833	{
		834	return backend;
		835	}
		836
		837	static void
		838	loop_init (EV_P_ unsigned int flags)
		839	{
		840	if (!backend)
		841	{
		842	#if EV_USE_MONOTONIC
		843	{
		844	struct timespec ts;
		845	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		846	have_monotonic = 1;
		847	}
		848	#endif
		849
		850	ev_rt_now = ev_time ();
		851	mn_now = get_clock ();
		852	now_floor = mn_now;
		853	rtmn_diff = ev_rt_now - mn_now;
		854
		855	if (!(flags & EVFLAG_NOENV)
		856	&& !enable_secure ()
		857	&& getenv ("LIBEV_FLAGS"))
		858	flags = atoi (getenv ("LIBEV_FLAGS"));
		859
		860	if (!(flags & 0x0000ffffUL))
		861	flags |= ev_recommended_backends ();
		862
		863	backend = 0;
		864	#if EV_USE_PORT
		865	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		866	#endif
		867	#if EV_USE_KQUEUE
		868	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		869	#endif
		870	#if EV_USE_EPOLL
		871	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		872	#endif
		873	#if EV_USE_POLL
		874	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		875	#endif
		876	#if EV_USE_SELECT
		877	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		878	#endif
		879
		880	ev_init (&sigev, sigcb);
		881	ev_set_priority (&sigev, EV_MAXPRI);
		882	}
		883	}
		884
		885	static void
		886	loop_destroy (EV_P)
347	{	887	{
348	int i;	888	int i;
349		889
350	for (i = 0; i < pendingcnt; ++i)	890	#if EV_USE_PORT
		891	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		892	#endif
		893	#if EV_USE_KQUEUE
		894	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		895	#endif
		896	#if EV_USE_EPOLL
		897	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		898	#endif
		899	#if EV_USE_POLL
		900	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		901	#endif
		902	#if EV_USE_SELECT
		903	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		904	#endif
		905
		906	for (i = NUMPRI; i--; )
		907	array_free (pending, [i]);
		908
		909	/* have to use the microsoft-never-gets-it-right macro */
		910	array_free (fdchange, EMPTY0);
		911	array_free (timer, EMPTY0);
		912	#if EV_PERIODICS
		913	array_free (periodic, EMPTY0);
		914	#endif
		915	array_free (idle, EMPTY0);
		916	array_free (prepare, EMPTY0);
		917	array_free (check, EMPTY0);
		918
		919	backend = 0;
		920	}
		921
		922	static void
		923	loop_fork (EV_P)
		924	{
		925	#if EV_USE_PORT
		926	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		927	#endif
		928	#if EV_USE_KQUEUE
		929	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		930	#endif
		931	#if EV_USE_EPOLL
		932	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		933	#endif
		934
		935	if (ev_is_active (&sigev))
		936	{
		937	/* default loop */
		938
		939	ev_ref (EV_A);
		940	ev_io_stop (EV_A_ &sigev);
		941	close (sigpipe [0]);
		942	close (sigpipe [1]);
		943
		944	while (pipe (sigpipe))
		945	syserr ("(libev) error creating pipe");
		946
		947	siginit (EV_A);
351	{	948	}
352	ANPENDING *p = pendings + i;
353		949
354	if (p->w)	950	postfork = 0;
		951	}
		952
		953	#if EV_MULTIPLICITY
		954	struct ev_loop *
		955	ev_loop_new (unsigned int flags)
		956	{
		957	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		958
		959	memset (loop, 0, sizeof (struct ev_loop));
		960
		961	loop_init (EV_A_ flags);
		962
		963	if (ev_backend (EV_A))
		964	return loop;
		965
		966	return 0;
		967	}
		968
		969	void
		970	ev_loop_destroy (EV_P)
		971	{
		972	loop_destroy (EV_A);
		973	ev_free (loop);
		974	}
		975
		976	void
		977	ev_loop_fork (EV_P)
		978	{
		979	postfork = 1;
		980	}
		981
		982	#endif
		983
		984	#if EV_MULTIPLICITY
		985	struct ev_loop *
		986	ev_default_loop_init (unsigned int flags)
		987	#else
		988	int
		989	ev_default_loop (unsigned int flags)
		990	#endif
		991	{
		992	if (sigpipe [0] == sigpipe [1])
		993	if (pipe (sigpipe))
		994	return 0;
		995
		996	if (!ev_default_loop_ptr)
		997	{
		998	#if EV_MULTIPLICITY
		999	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1000	#else
		1001	ev_default_loop_ptr = 1;
		1002	#endif
		1003
		1004	loop_init (EV_A_ flags);
		1005
		1006	if (ev_backend (EV_A))
355	{	1007	{
356	p->w->pending = 0;	1008	siginit (EV_A);
357	p->w->cb (p->w, p->events);	1009
		1010	#ifndef _WIN32
		1011	ev_signal_init (&childev, childcb, SIGCHLD);
		1012	ev_set_priority (&childev, EV_MAXPRI);
		1013	ev_signal_start (EV_A_ &childev);
		1014	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1015	#endif
358	}	1016	}
		1017	else
		1018	ev_default_loop_ptr = 0;
		1019	}
		1020
		1021	return ev_default_loop_ptr;
		1022	}
		1023
		1024	void
		1025	ev_default_destroy (void)
		1026	{
		1027	#if EV_MULTIPLICITY
		1028	struct ev_loop *loop = ev_default_loop_ptr;
		1029	#endif
		1030
		1031	#ifndef _WIN32
		1032	ev_ref (EV_A); /* child watcher */
		1033	ev_signal_stop (EV_A_ &childev);
		1034	#endif
		1035
		1036	ev_ref (EV_A); /* signal watcher */
		1037	ev_io_stop (EV_A_ &sigev);
		1038
		1039	close (sigpipe [0]); sigpipe [0] = 0;
		1040	close (sigpipe [1]); sigpipe [1] = 0;
		1041
		1042	loop_destroy (EV_A);
		1043	}
		1044
		1045	void
		1046	ev_default_fork (void)
		1047	{
		1048	#if EV_MULTIPLICITY
		1049	struct ev_loop *loop = ev_default_loop_ptr;
		1050	#endif
		1051
		1052	if (backend)
		1053	postfork = 1;
		1054	}
		1055
		1056	/*****************************************************************************/
		1057
		1058	static int
		1059	any_pending (EV_P)
		1060	{
		1061	int pri;
		1062
		1063	for (pri = NUMPRI; pri--; )
		1064	if (pendingcnt [pri])
		1065	return 1;
		1066
		1067	return 0;
		1068	}
		1069
		1070	inline void
		1071	call_pending (EV_P)
		1072	{
		1073	int pri;
		1074
		1075	for (pri = NUMPRI; pri--; )
		1076	while (pendingcnt [pri])
		1077	{
		1078	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1079
		1080	if (expect_true (p->w))
		1081	{
		1082	p->w->pending = 0;
		1083	EV_CB_INVOKE (p->w, p->events);
		1084	}
359	}	1085	}
360
361	pendingcnt = 0;
362	}	1086	}
363		1087
364	static void	1088	inline void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1089	timers_reify (EV_P)
366	{	1090	{
367	while (timercnt && timers [0]->at <= now)	1091	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	1092	{
369	struct ev_timer *w = timers [0];	1093	struct ev_timer *w = timers [0];
		1094
		1095	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		1096
371	/* first reschedule or stop timer */	1097	/* first reschedule or stop timer */
372	if (w->repeat)	1098	if (w->repeat)
373	{	1099	{
374	if (w->is_abs)	1100	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1101
376	else
377	w->at = now + w->repeat;	1102	((WT)w)->at += w->repeat;
		1103	if (((WT)w)->at < mn_now)
		1104	((WT)w)->at = mn_now;
378		1105
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	1106	downheap ((WT *)timers, timercnt, 0);
382	}	1107	}
383	else	1108	else
		1109	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1110
		1111	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1112	}
		1113	}
		1114
		1115	#if EV_PERIODICS
		1116	inline void
		1117	periodics_reify (EV_P)
		1118	{
		1119	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1120	{
		1121	struct ev_periodic *w = periodics [0];
		1122
		1123	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1124
		1125	/* first reschedule or stop timer */
		1126	if (w->reschedule_cb)
384	{	1127	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	1128	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
386	--timercnt; /* maybe pass by reference instead? */	1129	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1130	downheap ((WT *)periodics, periodiccnt, 0);
387	}	1131	}
		1132	else if (w->interval)
		1133	{
		1134	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1135	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1136	downheap ((WT *)periodics, periodiccnt, 0);
		1137	}
		1138	else
		1139	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1140
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1141	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1142	}
391	}	1143	}
392		1144
393	static void	1145	static void
394	time_update ()	1146	periodics_reschedule (EV_P)
395	{	1147	{
396	int i;	1148	int i;
		1149
		1150	/* adjust periodics after time jump */
		1151	for (i = 0; i < periodiccnt; ++i)
		1152	{
		1153	struct ev_periodic *w = periodics [i];
		1154
		1155	if (w->reschedule_cb)
		1156	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1157	else if (w->interval)
		1158	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1159	}
		1160
		1161	/* now rebuild the heap */
		1162	for (i = periodiccnt >> 1; i--; )
		1163	downheap ((WT *)periodics, periodiccnt, i);
		1164	}
		1165	#endif
		1166
		1167	inline int
		1168	time_update_monotonic (EV_P)
		1169	{
		1170	mn_now = get_clock ();
		1171
		1172	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1173	{
		1174	ev_rt_now = rtmn_diff + mn_now;
		1175	return 0;
		1176	}
		1177	else
		1178	{
		1179	now_floor = mn_now;
397	ev_now = ev_time ();	1180	ev_rt_now = ev_time ();
398		1181	return 1;
399	if (have_monotonic)
400	{	1182	}
401	ev_tstamp odiff = diff;	1183	}
402		1184
403	/* detecting time jumps is much more difficult */	1185	inline void
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1186	time_update (EV_P)
		1187	{
		1188	int i;
		1189
		1190	#if EV_USE_MONOTONIC
		1191	if (expect_true (have_monotonic))
		1192	{
		1193	if (time_update_monotonic (EV_A))
405	{	1194	{
406	now = get_clock ();	1195	ev_tstamp odiff = rtmn_diff;
		1196
		1197	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1198	{
407	diff = ev_now - now;	1199	rtmn_diff = ev_rt_now - mn_now;
408		1200
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1201	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1202	return; /* all is well */
411		1203
412	ev_now = ev_time ();	1204	ev_rt_now = ev_time ();
		1205	mn_now = get_clock ();
		1206	now_floor = mn_now;
		1207	}
		1208
		1209	# if EV_PERIODICS
		1210	periodics_reschedule (EV_A);
		1211	# endif
		1212	/* no timer adjustment, as the monotonic clock doesn't jump */
		1213	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
413	}	1214	}
		1215	}
		1216	else
		1217	#endif
		1218	{
		1219	ev_rt_now = ev_time ();
414		1220
415	/* time jump detected, reschedule atimers */	1221	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
416	for (i = 0; i < atimercnt; ++i)
417	{	1222	{
418	struct ev_timer *w = atimers [i];	1223	#if EV_PERIODICS
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1224	periodics_reschedule (EV_A);
		1225	#endif
		1226
		1227	/* adjust timers. this is easy, as the offset is the same for all */
		1228	for (i = 0; i < timercnt; ++i)
		1229	((WT)timers [i])->at += ev_rt_now - mn_now;
420	}	1230	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1231
429	now = ev_now;	1232	mn_now = ev_rt_now;
430	}	1233	}
431	}	1234	}
432		1235
433	int ev_loop_done;	1236	void
		1237	ev_ref (EV_P)
		1238	{
		1239	++activecnt;
		1240	}
434		1241
		1242	void
		1243	ev_unref (EV_P)
		1244	{
		1245	--activecnt;
		1246	}
		1247
		1248	static int loop_done;
		1249
		1250	void
435	void ev_loop (int flags)	1251	ev_loop (EV_P_ int flags)
436	{	1252	{
437	double block;	1253	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1254	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		1255
440	do	1256	while (activecnt)
441	{	1257	{
		1258	/* queue check watchers (and execute them) */
		1259	if (expect_false (preparecnt))
		1260	{
		1261	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1262	call_pending (EV_A);
		1263	}
		1264
		1265	/* we might have forked, so reify kernel state if necessary */
		1266	if (expect_false (postfork))
		1267	loop_fork (EV_A);
		1268
442	/* update fd-related kernel structures */	1269	/* update fd-related kernel structures */
443	fd_reify ();	1270	fd_reify (EV_A);
444		1271
445	/* calculate blocking time */	1272	/* calculate blocking time */
		1273
		1274	/* we only need this for !monotonic clock or timers, but as we basically
		1275	always have timers, we just calculate it always */
		1276	#if EV_USE_MONOTONIC
		1277	if (expect_true (have_monotonic))
		1278	time_update_monotonic (EV_A);
		1279	else
		1280	#endif
		1281	{
		1282	ev_rt_now = ev_time ();
		1283	mn_now = ev_rt_now;
		1284	}
		1285
446	if (flags & EVLOOP_NONBLOCK)	1286	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1287	block = 0.;
448	else	1288	else
449	{	1289	{
450	block = MAX_BLOCKTIME;	1290	block = MAX_BLOCKTIME;
451		1291
452	if (rtimercnt)	1292	if (timercnt)
453	{	1293	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1294	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
455	if (block > to) block = to;	1295	if (block > to) block = to;
456	}	1296	}
457		1297
		1298	#if EV_PERIODICS
458	if (atimercnt)	1299	if (periodiccnt)
459	{	1300	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1301	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
461	if (block > to) block = to;	1302	if (block > to) block = to;
462	}	1303	}
		1304	#endif
463		1305
464	if (block < 0.) block = 0.;	1306	if (expect_false (block < 0.)) block = 0.;
465	}	1307	}
466		1308
467	method_poll (block);	1309	backend_poll (EV_A_ block);
468		1310
469	/* update ev_now, do magic */	1311	/* update ev_rt_now, do magic */
470	time_update ();	1312	time_update (EV_A);
471		1313
472	/* put pending timers into pendign queue and reschedule them */	1314	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1315	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1316	#if EV_PERIODICS
475	/* relative timers second */	1317	periodics_reify (EV_A); /* absolute timers called first */
476	timers_reify (rtimers, rtimercnt, now);	1318	#endif
477		1319
		1320	/* queue idle watchers unless io or timers are pending */
		1321	if (idlecnt && !any_pending (EV_A))
		1322	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1323
		1324	/* queue check watchers, to be executed first */
		1325	if (expect_false (checkcnt))
		1326	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1327
478	call_pending ();	1328	call_pending (EV_A);
479	}
480	while (!ev_loop_done);
481	}
482		1329
483	static void	1330	if (expect_false (loop_done))
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1331	break;
		1332	}
		1333
		1334	if (loop_done != 2)
		1335	loop_done = 0;
		1336	}
		1337
		1338	void
		1339	ev_unloop (EV_P_ int how)
		1340	{
		1341	loop_done = how;
		1342	}
		1343
		1344	/*****************************************************************************/
		1345
		1346	inline void
		1347	wlist_add (WL *head, WL elem)
485	{	1348	{
486	elem->next = *head;	1349	elem->next = *head;
487	*head = elem;	1350	*head = elem;
488	}	1351	}
489		1352
490	static void	1353	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1354	wlist_del (WL *head, WL elem)
492	{	1355	{
493	while (*head)	1356	while (*head)
494	{	1357	{
495	if (*head == elem)	1358	if (*head == elem)
496	{	1359	{
…		…
500		1363
501	head = &(*head)->next;	1364	head = &(*head)->next;
502	}	1365	}
503	}	1366	}
504		1367
505	static void	1368	inline void
506	ev_start (struct ev_watcher *w, int active)	1369	ev_clear_pending (EV_P_ W w)
507	{	1370	{
		1371	if (w->pending)
		1372	{
		1373	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1374	w->pending = 0;
		1375	}
		1376	}
		1377
		1378	inline void
		1379	ev_start (EV_P_ W w, int active)
		1380	{
		1381	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1382	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1383
509	w->active = active;	1384	w->active = active;
		1385	ev_ref (EV_A);
510	}	1386	}
511		1387
512	static void	1388	inline void
513	ev_stop (struct ev_watcher *w)	1389	ev_stop (EV_P_ W w)
514	{	1390	{
515	if (w->pending)	1391	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1392	w->active = 0;
519	/* nop */
520	}	1393	}
521		1394
		1395	/*****************************************************************************/
		1396
522	void	1397	void
523	evio_start (struct ev_io *w)	1398	ev_io_start (EV_P_ struct ev_io *w)
		1399	{
		1400	int fd = w->fd;
		1401
		1402	if (expect_false (ev_is_active (w)))
		1403	return;
		1404
		1405	assert (("ev_io_start called with negative fd", fd >= 0));
		1406
		1407	ev_start (EV_A_ (W)w, 1);
		1408	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1409	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1410
		1411	fd_change (EV_A_ fd);
		1412	}
		1413
		1414	void
		1415	ev_io_stop (EV_P_ struct ev_io *w)
		1416	{
		1417	ev_clear_pending (EV_A_ (W)w);
		1418	if (expect_false (!ev_is_active (w)))
		1419	return;
		1420
		1421	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1422
		1423	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1424	ev_stop (EV_A_ (W)w);
		1425
		1426	fd_change (EV_A_ w->fd);
		1427	}
		1428
		1429	void
		1430	ev_timer_start (EV_P_ struct ev_timer *w)
		1431	{
		1432	if (expect_false (ev_is_active (w)))
		1433	return;
		1434
		1435	((WT)w)->at += mn_now;
		1436
		1437	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1438
		1439	ev_start (EV_A_ (W)w, ++timercnt);
		1440	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1441	timers [timercnt - 1] = w;
		1442	upheap ((WT *)timers, timercnt - 1);
		1443
		1444	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1445	}
		1446
		1447	void
		1448	ev_timer_stop (EV_P_ struct ev_timer *w)
		1449	{
		1450	ev_clear_pending (EV_A_ (W)w);
		1451	if (expect_false (!ev_is_active (w)))
		1452	return;
		1453
		1454	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1455
		1456	if (expect_true (((W)w)->active < timercnt--))
		1457	{
		1458	timers [((W)w)->active - 1] = timers [timercnt];
		1459	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1460	}
		1461
		1462	((WT)w)->at -= mn_now;
		1463
		1464	ev_stop (EV_A_ (W)w);
		1465	}
		1466
		1467	void
		1468	ev_timer_again (EV_P_ struct ev_timer *w)
524	{	1469	{
525	if (ev_is_active (w))	1470	if (ev_is_active (w))
526	return;
527
528	int fd = w->fd;
529
530	ev_start ((struct ev_watcher *)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
533
534	++fdchangecnt;
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}
538
539	void
540	evio_stop (struct ev_io *w)
541	{
542	if (!ev_is_active (w))
543	return;
544
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
546	ev_stop ((struct ev_watcher *)w);
547
548	++fdchangecnt;
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}
552
553	void
554	evtimer_start (struct ev_timer *w)
555	{
556	if (ev_is_active (w))
557	return;
558
559	if (w->is_abs)
560	{	1471	{
561	/* this formula differs from the one in timer_reify becuse we do not round up */
562	if (w->repeat)	1472	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
564
565	ev_start ((struct ev_watcher *)w, ++atimercnt);
566	array_needsize (atimers, atimermax, atimercnt, );
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else
571	{
572	w->at += now;
573
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );
576	rtimers [rtimercnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);
578	}
579
580	}
581
582	void
583	evtimer_stop (struct ev_timer *w)
584	{
585	if (!ev_is_active (w))
586	return;
587
588	if (w->is_abs)
589	{
590	if (w->active < atimercnt--)
591	{	1473	{
592	atimers [w->active - 1] = atimers [atimercnt];	1474	((WT)w)->at = mn_now + w->repeat;
593	downheap (atimers, atimercnt, w->active - 1);	1475	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
594	}	1476	}
595	}
596	else	1477	else
		1478	ev_timer_stop (EV_A_ w);
597	{	1479	}
598	if (w->active < rtimercnt--)	1480	else if (w->repeat)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}	1481	{
604		1482	w->at = w->repeat;
605	ev_stop ((struct ev_watcher *)w);	1483	ev_timer_start (EV_A_ w);
		1484	}
606	}	1485	}
607		1486
		1487	#if EV_PERIODICS
608	void	1488	void
		1489	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1490	{
		1491	if (expect_false (ev_is_active (w)))
		1492	return;
		1493
		1494	if (w->reschedule_cb)
		1495	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1496	else if (w->interval)
		1497	{
		1498	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1499	/* this formula differs from the one in periodic_reify because we do not always round up */
		1500	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1501	}
		1502
		1503	ev_start (EV_A_ (W)w, ++periodiccnt);
		1504	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1505	periodics [periodiccnt - 1] = w;
		1506	upheap ((WT *)periodics, periodiccnt - 1);
		1507
		1508	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1509	}
		1510
		1511	void
		1512	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1513	{
		1514	ev_clear_pending (EV_A_ (W)w);
		1515	if (expect_false (!ev_is_active (w)))
		1516	return;
		1517
		1518	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1519
		1520	if (expect_true (((W)w)->active < periodiccnt--))
		1521	{
		1522	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1523	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1524	}
		1525
		1526	ev_stop (EV_A_ (W)w);
		1527	}
		1528
		1529	void
		1530	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1531	{
		1532	/* TODO: use adjustheap and recalculation */
		1533	ev_periodic_stop (EV_A_ w);
		1534	ev_periodic_start (EV_A_ w);
		1535	}
		1536	#endif
		1537
		1538	void
		1539	ev_idle_start (EV_P_ struct ev_idle *w)
		1540	{
		1541	if (expect_false (ev_is_active (w)))
		1542	return;
		1543
		1544	ev_start (EV_A_ (W)w, ++idlecnt);
		1545	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1546	idles [idlecnt - 1] = w;
		1547	}
		1548
		1549	void
		1550	ev_idle_stop (EV_P_ struct ev_idle *w)
		1551	{
		1552	ev_clear_pending (EV_A_ (W)w);
		1553	if (expect_false (!ev_is_active (w)))
		1554	return;
		1555
		1556	idles [((W)w)->active - 1] = idles [--idlecnt];
		1557	ev_stop (EV_A_ (W)w);
		1558	}
		1559
		1560	void
		1561	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1562	{
		1563	if (expect_false (ev_is_active (w)))
		1564	return;
		1565
		1566	ev_start (EV_A_ (W)w, ++preparecnt);
		1567	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1568	prepares [preparecnt - 1] = w;
		1569	}
		1570
		1571	void
		1572	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1573	{
		1574	ev_clear_pending (EV_A_ (W)w);
		1575	if (expect_false (!ev_is_active (w)))
		1576	return;
		1577
		1578	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1579	ev_stop (EV_A_ (W)w);
		1580	}
		1581
		1582	void
		1583	ev_check_start (EV_P_ struct ev_check *w)
		1584	{
		1585	if (expect_false (ev_is_active (w)))
		1586	return;
		1587
		1588	ev_start (EV_A_ (W)w, ++checkcnt);
		1589	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1590	checks [checkcnt - 1] = w;
		1591	}
		1592
		1593	void
		1594	ev_check_stop (EV_P_ struct ev_check *w)
		1595	{
		1596	ev_clear_pending (EV_A_ (W)w);
		1597	if (expect_false (!ev_is_active (w)))
		1598	return;
		1599
		1600	checks [((W)w)->active - 1] = checks [--checkcnt];
		1601	ev_stop (EV_A_ (W)w);
		1602	}
		1603
		1604	#ifndef SA_RESTART
		1605	# define SA_RESTART 0
		1606	#endif
		1607
		1608	void
609	evsignal_start (struct ev_signal *w)	1609	ev_signal_start (EV_P_ struct ev_signal *w)
610	{	1610	{
		1611	#if EV_MULTIPLICITY
		1612	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1613	#endif
611	if (ev_is_active (w))	1614	if (expect_false (ev_is_active (w)))
612	return;	1615	return;
613		1616
614	ev_start ((struct ev_watcher *)w, 1);	1617	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1618
		1619	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1620	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1621	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1622
618	if (!w->next)	1623	if (!((WL)w)->next)
619	{	1624	{
		1625	#if _WIN32
		1626	signal (w->signum, sighandler);
		1627	#else
620	struct sigaction sa;	1628	struct sigaction sa;
621	sa.sa_handler = sighandler;	1629	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1630	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1631	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1632	sigaction (w->signum, &sa, 0);
		1633	#endif
625	}	1634	}
626	}	1635	}
627		1636
628	void	1637	void
629	evsignal_stop (struct ev_signal *w)	1638	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1639	{
		1640	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1641	if (expect_false (!ev_is_active (w)))
632	return;	1642	return;
633		1643
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1644	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1645	ev_stop (EV_A_ (W)w);
636		1646
637	if (!signals [w->signum - 1].head)	1647	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1648	signal (w->signum, SIG_DFL);
639	}	1649	}
640		1650
		1651	void
		1652	ev_child_start (EV_P_ struct ev_child *w)
		1653	{
		1654	#if EV_MULTIPLICITY
		1655	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1656	#endif
		1657	if (expect_false (ev_is_active (w)))
		1658	return;
		1659
		1660	ev_start (EV_A_ (W)w, 1);
		1661	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1662	}
		1663
		1664	void
		1665	ev_child_stop (EV_P_ struct ev_child *w)
		1666	{
		1667	ev_clear_pending (EV_A_ (W)w);
		1668	if (expect_false (!ev_is_active (w)))
		1669	return;
		1670
		1671	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1672	ev_stop (EV_A_ (W)w);
		1673	}
		1674
		1675	#if EV_MULTIPLICITY
		1676	static void
		1677	embed_cb (EV_P_ struct ev_io *io, int revents)
		1678	{
		1679	struct ev_embed *w = (struct ev_embed *)(((char *)io) - offsetof (struct ev_embed, io));
		1680
		1681	ev_feed_event (EV_A_ (W)w, EV_EMBED);
		1682	ev_loop (w->loop, EVLOOP_NONBLOCK);
		1683	}
		1684
		1685	void
		1686	ev_embed_start (EV_P_ struct ev_embed *w)
		1687	{
		1688	if (expect_false (ev_is_active (w)))
		1689	return;
		1690
		1691	{
		1692	struct ev_loop *loop = w->loop;
		1693	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		1694	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		1695	}
		1696
		1697	ev_io_start (EV_A_ &w->io);
		1698	ev_start (EV_A_ (W)w, 1);
		1699	}
		1700
		1701	void
		1702	ev_embed_stop (EV_P_ struct ev_embed *w)
		1703	{
		1704	ev_clear_pending (EV_A_ (W)w);
		1705	if (expect_false (!ev_is_active (w)))
		1706	return;
		1707
		1708	ev_io_stop (EV_A_ &w->io);
		1709	ev_stop (EV_A_ (W)w);
		1710	}
		1711	#endif
		1712
641	/*****************************************************************************/	1713	/*****************************************************************************/
642	#if 1
643		1714
644	static void	1715	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1716	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648	}
649
650	static void
651	ocb (struct ev_timer *w, int revents)
652	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}
657
658	static void
659	scb (struct ev_signal *w, int revents)
660	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662	}
663
664	int main (void)
665	{
666	struct ev_io sin;	1717	struct ev_io io;
667
668	ev_init (0);
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}
687	#endif
688
689	struct ev_timer t1;	1718	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1719	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1720	void *arg;
692	evtimer_start (&t1);	1721	};
693		1722
694	struct ev_signal sig;	1723	static void
695	evw_init (&sig, scb, 65535);	1724	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1725	{
697	evsignal_start (&sig);	1726	void (*cb)(int revents, void *arg) = once->cb;
		1727	void *arg = once->arg;
698		1728
699	ev_loop (0);	1729	ev_io_stop (EV_A_ &once->io);
		1730	ev_timer_stop (EV_A_ &once->to);
		1731	ev_free (once);
700		1732
		1733	cb (revents, arg);
		1734	}
		1735
		1736	static void
		1737	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1738	{
		1739	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1740	}
		1741
		1742	static void
		1743	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1744	{
		1745	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1746	}
		1747
		1748	void
		1749	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1750	{
		1751	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1752
		1753	if (expect_false (!once))
		1754	{
		1755	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
701	return 0;	1756	return;
702	}	1757	}
703		1758
704	#endif	1759	once->cb = cb;
		1760	once->arg = arg;
705		1761
		1762	ev_init (&once->io, once_cb_io);
		1763	if (fd >= 0)
		1764	{
		1765	ev_io_set (&once->io, fd, events);
		1766	ev_io_start (EV_A_ &once->io);
		1767	}
706		1768
		1769	ev_init (&once->to, once_cb_to);
		1770	if (timeout >= 0.)
		1771	{
		1772	ev_timer_set (&once->to, timeout, 0.);
		1773	ev_timer_start (EV_A_ &once->to);
		1774	}
		1775	}
707		1776
		1777	#ifdef __cplusplus
		1778	}
		1779	#endif
708		1780

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