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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.220 by root, Sun Apr 6 09:53:17 2008 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without modifica-
		8	* tion, are permitted provided that the following conditions are met:
		9	*
		10	* 1. Redistributions of source code must retain the above copyright notice,
		11	* this list of conditions and the following disclaimer.
		12	*
		13	* 2. Redistributions in binary form must reproduce the above copyright
		14	* notice, this list of conditions and the following disclaimer in the
		15	* documentation and/or other materials provided with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
		18	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
		19	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
		20	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
		21	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
		22	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
		23	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
		24	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
		25	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
		26	* OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*
		28	* Alternatively, the contents of this file may be used under the terms of
		29	* the GNU General Public License ("GPL") version 2 or any later version,
		30	* in which case the provisions of the GPL are applicable instead of
		31	* the above. If you wish to allow the use of your version of this file
		32	* only under the terms of the GPL and not to allow others to use your
		33	* version of this file under the BSD license, indicate your decision
		34	* by deleting the provisions above and replace them with the notice
		35	* and other provisions required by the GPL. If you do not delete the
		36	* provisions above, a recipient may use your version of this file under
		37	* either the BSD or the GPL.
		38	*/
		39
		40	#ifdef __cplusplus
		41	extern "C" {
		42	#endif
		43
		44	/* this big block deduces configuration from config.h */
		45	#ifndef EV_STANDALONE
		46	# ifdef EV_CONFIG_H
		47	# include EV_CONFIG_H
		48	# else
		49	# include "config.h"
		50	# endif
		51
		52	# if HAVE_CLOCK_GETTIME
		53	# ifndef EV_USE_MONOTONIC
		54	# define EV_USE_MONOTONIC 1
		55	# endif
		56	# ifndef EV_USE_REALTIME
		57	# define EV_USE_REALTIME 1
		58	# endif
		59	# else
		60	# ifndef EV_USE_MONOTONIC
		61	# define EV_USE_MONOTONIC 0
		62	# endif
		63	# ifndef EV_USE_REALTIME
		64	# define EV_USE_REALTIME 0
		65	# endif
		66	# endif
		67
		68	# ifndef EV_USE_NANOSLEEP
		69	# if HAVE_NANOSLEEP
		70	# define EV_USE_NANOSLEEP 1
		71	# else
		72	# define EV_USE_NANOSLEEP 0
		73	# endif
		74	# endif
		75
		76	# ifndef EV_USE_SELECT
		77	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		78	# define EV_USE_SELECT 1
		79	# else
		80	# define EV_USE_SELECT 0
		81	# endif
		82	# endif
		83
		84	# ifndef EV_USE_POLL
		85	# if HAVE_POLL && HAVE_POLL_H
		86	# define EV_USE_POLL 1
		87	# else
		88	# define EV_USE_POLL 0
		89	# endif
		90	# endif
		91
		92	# ifndef EV_USE_EPOLL
		93	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		94	# define EV_USE_EPOLL 1
		95	# else
		96	# define EV_USE_EPOLL 0
		97	# endif
		98	# endif
		99
		100	# ifndef EV_USE_KQUEUE
		101	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		102	# define EV_USE_KQUEUE 1
		103	# else
		104	# define EV_USE_KQUEUE 0
		105	# endif
		106	# endif
		107
		108	# ifndef EV_USE_PORT
		109	# if HAVE_PORT_H && HAVE_PORT_CREATE
		110	# define EV_USE_PORT 1
		111	# else
		112	# define EV_USE_PORT 0
		113	# endif
		114	# endif
		115
		116	# ifndef EV_USE_INOTIFY
		117	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		118	# define EV_USE_INOTIFY 1
		119	# else
		120	# define EV_USE_INOTIFY 0
		121	# endif
		122	# endif
		123
		124	# ifndef EV_USE_EVENTFD
		125	# if HAVE_EVENTFD
		126	# define EV_USE_EVENTFD 1
		127	# else
		128	# define EV_USE_EVENTFD 0
		129	# endif
		130	# endif
		131
		132	#endif
		133
1	#include <math.h>	134	#include <math.h>
2	#include <stdlib.h>	135	#include <stdlib.h>
		136	#include <fcntl.h>
		137	#include <stddef.h>
3		138
4	#include <stdio.h>	139	#include <stdio.h>
5		140
		141	#include <assert.h>
6	#include <errno.h>	142	#include <errno.h>
7	#include <sys/time.h>	143	#include <sys/types.h>
8	#include <time.h>	144	#include <time.h>
9		145
		146	#include <signal.h>
		147
		148	#ifdef EV_H
		149	# include EV_H
		150	#else
		151	# include "ev.h"
		152	#endif
		153
		154	#ifndef _WIN32
		155	# include <sys/time.h>
		156	# include <sys/wait.h>
		157	# include <unistd.h>
		158	#else
		159	# define WIN32_LEAN_AND_MEAN
		160	# include <windows.h>
		161	# ifndef EV_SELECT_IS_WINSOCKET
		162	# define EV_SELECT_IS_WINSOCKET 1
		163	# endif
		164	#endif
		165
		166	/* this block tries to deduce configuration from header-defined symbols and defaults */
		167
		168	#ifndef EV_USE_MONOTONIC
		169	# define EV_USE_MONOTONIC 0
		170	#endif
		171
		172	#ifndef EV_USE_REALTIME
		173	# define EV_USE_REALTIME 0
		174	#endif
		175
		176	#ifndef EV_USE_NANOSLEEP
		177	# define EV_USE_NANOSLEEP 0
		178	#endif
		179
		180	#ifndef EV_USE_SELECT
		181	# define EV_USE_SELECT 1
		182	#endif
		183
		184	#ifndef EV_USE_POLL
		185	# ifdef _WIN32
		186	# define EV_USE_POLL 0
		187	# else
		188	# define EV_USE_POLL 1
		189	# endif
		190	#endif
		191
		192	#ifndef EV_USE_EPOLL
		193	# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
		194	# define EV_USE_EPOLL 1
		195	# else
		196	# define EV_USE_EPOLL 0
		197	# endif
		198	#endif
		199
		200	#ifndef EV_USE_KQUEUE
		201	# define EV_USE_KQUEUE 0
		202	#endif
		203
		204	#ifndef EV_USE_PORT
		205	# define EV_USE_PORT 0
		206	#endif
		207
		208	#ifndef EV_USE_INOTIFY
		209	# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
		210	# define EV_USE_INOTIFY 1
		211	# else
		212	# define EV_USE_INOTIFY 0
		213	# endif
		214	#endif
		215
		216	#ifndef EV_PID_HASHSIZE
		217	# if EV_MINIMAL
		218	# define EV_PID_HASHSIZE 1
		219	# else
		220	# define EV_PID_HASHSIZE 16
		221	# endif
		222	#endif
		223
		224	#ifndef EV_INOTIFY_HASHSIZE
		225	# if EV_MINIMAL
		226	# define EV_INOTIFY_HASHSIZE 1
		227	# else
		228	# define EV_INOTIFY_HASHSIZE 16
		229	# endif
		230	#endif
		231
		232	#ifndef EV_USE_EVENTFD
		233	# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
		234	# define EV_USE_EVENTFD 1
		235	# else
		236	# define EV_USE_EVENTFD 0
		237	# endif
		238	#endif
		239
		240	/* this block fixes any misconfiguration where we know we run into trouble otherwise */
		241
10	#ifdef CLOCK_MONOTONIC	242	#ifndef CLOCK_MONOTONIC
		243	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	244	# define EV_USE_MONOTONIC 0
		245	#endif
		246
		247	#ifndef CLOCK_REALTIME
		248	# undef EV_USE_REALTIME
		249	# define EV_USE_REALTIME 0
		250	#endif
		251
		252	#if !EV_STAT_ENABLE
		253	# undef EV_USE_INOTIFY
		254	# define EV_USE_INOTIFY 0
		255	#endif
		256
		257	#if !EV_USE_NANOSLEEP
		258	# ifndef _WIN32
		259	# include <sys/select.h>
12	#endif	260	# endif
		261	#endif
13		262
14	#define HAVE_EPOLL 1	263	#if EV_USE_INOTIFY
15	#define HAVE_REALTIME 1	264	# include <sys/inotify.h>
16	#define HAVE_SELECT 0	265	#endif
17		266
18	#define MAX_BLOCKTIME 60.	267	#if EV_SELECT_IS_WINSOCKET
		268	# include <winsock.h>
		269	#endif
19		270
		271	#if EV_USE_EVENTFD
		272	/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
		273	int eventfd (unsigned int initval, int flags);
		274	#endif
		275
		276	/**/
		277
		278	/*
		279	* This is used to avoid floating point rounding problems.
		280	* It is added to ev_rt_now when scheduling periodics
		281	* to ensure progress, time-wise, even when rounding
		282	* errors are against us.
		283	* This value is good at least till the year 4000.
		284	* Better solutions welcome.
		285	*/
		286	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
		287
		288	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		289	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		290	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
		291
		292	#if __GNUC__ >= 4
		293	# define expect(expr,value) __builtin_expect ((expr),(value))
		294	# define noinline __attribute__ ((noinline))
		295	#else
		296	# define expect(expr,value) (expr)
		297	# define noinline
		298	# if __STDC_VERSION__ < 199901L
		299	# define inline
		300	# endif
		301	#endif
		302
		303	#define expect_false(expr) expect ((expr) != 0, 0)
		304	#define expect_true(expr) expect ((expr) != 0, 1)
		305	#define inline_size static inline
		306
		307	#if EV_MINIMAL
		308	# define inline_speed static noinline
		309	#else
		310	# define inline_speed static inline
		311	#endif
		312
		313	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		314	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		315
		316	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		317	#define EMPTY2(a,b) /* used to suppress some warnings */
		318
		319	typedef ev_watcher *W;
		320	typedef ev_watcher_list *WL;
		321	typedef ev_watcher_time *WT;
		322
		323	#if EV_USE_MONOTONIC
		324	/* sig_atomic_t is used to avoid per-thread variables or locking but still */
		325	/* giving it a reasonably high chance of working on typical architetcures */
		326	static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		327	#endif
		328
		329	#ifdef _WIN32
		330	# include "ev_win32.c"
		331	#endif
		332
		333	/*****************************************************************************/
		334
		335	static void (*syserr_cb)(const char *msg);
		336
		337	void
		338	ev_set_syserr_cb (void (*cb)(const char *msg))
		339	{
		340	syserr_cb = cb;
		341	}
		342
		343	static void noinline
		344	syserr (const char *msg)
		345	{
		346	if (!msg)
		347	msg = "(libev) system error";
		348
		349	if (syserr_cb)
		350	syserr_cb (msg);
		351	else
		352	{
		353	perror (msg);
		354	abort ();
		355	}
		356	}
		357
		358	static void *(*alloc)(void *ptr, long size);
		359
		360	void
		361	ev_set_allocator (void *(*cb)(void *ptr, long size))
		362	{
		363	alloc = cb;
		364	}
		365
		366	inline_speed void *
		367	ev_realloc (void *ptr, long size)
		368	{
		369	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		370
		371	if (!ptr && size)
		372	{
		373	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		374	abort ();
		375	}
		376
		377	return ptr;
		378	}
		379
		380	#define ev_malloc(size) ev_realloc (0, (size))
		381	#define ev_free(ptr) ev_realloc ((ptr), 0)
		382
		383	/*****************************************************************************/
		384
		385	typedef struct
		386	{
		387	WL head;
		388	unsigned char events;
		389	unsigned char reify;
		390	#if EV_SELECT_IS_WINSOCKET
		391	SOCKET handle;
		392	#endif
		393	} ANFD;
		394
		395	typedef struct
		396	{
		397	W w;
		398	int events;
		399	} ANPENDING;
		400
		401	#if EV_USE_INOTIFY
		402	typedef struct
		403	{
		404	WL head;
		405	} ANFS;
		406	#endif
		407
		408	#if EV_MULTIPLICITY
		409
		410	struct ev_loop
		411	{
		412	ev_tstamp ev_rt_now;
		413	#define ev_rt_now ((loop)->ev_rt_now)
		414	#define VAR(name,decl) decl;
		415	#include "ev_vars.h"
		416	#undef VAR
		417	};
20	#include "ev.h"	418	#include "ev_wrap.h"
21		419
22	struct ev_watcher {	420	static struct ev_loop default_loop_struct;
23	EV_WATCHER (ev_watcher);	421	struct ev_loop *ev_default_loop_ptr;
24	};
25		422
26	struct ev_watcher_list {	423	#else
27	EV_WATCHER_LIST (ev_watcher_list);
28	};
29		424
30	ev_tstamp ev_now;	425	ev_tstamp ev_rt_now;
31	int ev_method;	426	#define VAR(name,decl) static decl;
		427	#include "ev_vars.h"
		428	#undef VAR
32		429
33	static int have_monotonic; /* runtime */	430	static int ev_default_loop_ptr;
34		431
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	432	#endif
36	static void (*method_reify)(void);	433
37	static void (*method_poll)(ev_tstamp timeout);	434	/*****************************************************************************/
38		435
39	ev_tstamp	436	ev_tstamp
40	ev_time (void)	437	ev_time (void)
41	{	438	{
42	#if HAVE_REALTIME	439	#if EV_USE_REALTIME
43	struct timespec ts;	440	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	441	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	442	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	443	#else
47	struct timeval tv;	444	struct timeval tv;
48	gettimeofday (&tv, 0);	445	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	446	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	447	#endif
51	}	448	}
52		449
53	static ev_tstamp	450	ev_tstamp inline_size
54	get_clock (void)	451	get_clock (void)
55	{	452	{
56	#if HAVE_MONOTONIC	453	#if EV_USE_MONOTONIC
57	if (have_monotonic)	454	if (expect_true (have_monotonic))
58	{	455	{
59	struct timespec ts;	456	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	457	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	458	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	459	}
63	#endif	460	#endif
64		461
65	return ev_time ();	462	return ev_time ();
66	}	463	}
67		464
		465	#if EV_MULTIPLICITY
		466	ev_tstamp
		467	ev_now (EV_P)
		468	{
		469	return ev_rt_now;
		470	}
		471	#endif
		472
		473	void
		474	ev_sleep (ev_tstamp delay)
		475	{
		476	if (delay > 0.)
		477	{
		478	#if EV_USE_NANOSLEEP
		479	struct timespec ts;
		480
		481	ts.tv_sec = (time_t)delay;
		482	ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
		483
		484	nanosleep (&ts, 0);
		485	#elif defined(_WIN32)
		486	Sleep ((unsigned long)(delay * 1e3));
		487	#else
		488	struct timeval tv;
		489
		490	tv.tv_sec = (time_t)delay;
		491	tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
		492
		493	select (0, 0, 0, 0, &tv);
		494	#endif
		495	}
		496	}
		497
		498	/*****************************************************************************/
		499
		500	int inline_size
		501	array_nextsize (int elem, int cur, int cnt)
		502	{
		503	int ncur = cur + 1;
		504
		505	do
		506	ncur <<= 1;
		507	while (cnt > ncur);
		508
		509	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		510	if (elem * ncur > 4096)
		511	{
		512	ncur *= elem;
		513	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		514	ncur = ncur - sizeof (void *) * 4;
		515	ncur /= elem;
		516	}
		517
		518	return ncur;
		519	}
		520
		521	static noinline void *
		522	array_realloc (int elem, void *base, int *cur, int cnt)
		523	{
		524	*cur = array_nextsize (elem, *cur, cnt);
		525	return ev_realloc (base, elem * *cur);
		526	}
		527
68	#define array_needsize(base,cur,cnt,init) \	528	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	529	if (expect_false ((cnt) > (cur))) \
70	{ \	530	{ \
71	int newcnt = cur ? cur << 1 : 16; \	531	int ocur_ = (cur); \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	532	(base) = (type *)array_realloc \
73	base = realloc (base, sizeof (*base) * (newcnt)); \	533	(sizeof (type), (base), &(cur), (cnt)); \
74	init (base + cur, newcnt - cur); \	534	init ((base) + (ocur_), (cur) - ocur_); \
75	cur = newcnt; \	535	}
		536
		537	#if 0
		538	#define array_slim(type,stem) \
		539	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		540	{ \
		541	stem ## max = array_roundsize (stem ## cnt >> 1); \
		542	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		543	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		544	}
		545	#endif
		546
		547	#define array_free(stem, idx) \
		548	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		549
		550	/*****************************************************************************/
		551
		552	void noinline
		553	ev_feed_event (EV_P_ void *w, int revents)
		554	{
		555	W w_ = (W)w;
		556	int pri = ABSPRI (w_);
		557
		558	if (expect_false (w_->pending))
		559	pendings [pri][w_->pending - 1].events |= revents;
		560	else
		561	{
		562	w_->pending = ++pendingcnt [pri];
		563	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		564	pendings [pri][w_->pending - 1].w = w_;
		565	pendings [pri][w_->pending - 1].events = revents;
		566	}
		567	}
		568
		569	void inline_speed
		570	queue_events (EV_P_ W *events, int eventcnt, int type)
		571	{
		572	int i;
		573
		574	for (i = 0; i < eventcnt; ++i)
		575	ev_feed_event (EV_A_ events [i], type);
		576	}
		577
		578	/*****************************************************************************/
		579
		580	void inline_size
		581	anfds_init (ANFD *base, int count)
		582	{
		583	while (count--)
		584	{
		585	base->head = 0;
		586	base->events = EV_NONE;
		587	base->reify = 0;
		588
		589	++base;
		590	}
		591	}
		592
		593	void inline_speed
		594	fd_event (EV_P_ int fd, int revents)
		595	{
		596	ANFD *anfd = anfds + fd;
		597	ev_io *w;
		598
		599	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		600	{
		601	int ev = w->events & revents;
		602
		603	if (ev)
		604	ev_feed_event (EV_A_ (W)w, ev);
		605	}
		606	}
		607
		608	void
		609	ev_feed_fd_event (EV_P_ int fd, int revents)
		610	{
		611	if (fd >= 0 && fd < anfdmax)
		612	fd_event (EV_A_ fd, revents);
		613	}
		614
		615	void inline_size
		616	fd_reify (EV_P)
		617	{
		618	int i;
		619
		620	for (i = 0; i < fdchangecnt; ++i)
		621	{
		622	int fd = fdchanges [i];
		623	ANFD *anfd = anfds + fd;
		624	ev_io *w;
		625
		626	unsigned char events = 0;
		627
		628	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		629	events |= (unsigned char)w->events;
		630
		631	#if EV_SELECT_IS_WINSOCKET
		632	if (events)
		633	{
		634	unsigned long argp;
		635	#ifdef EV_FD_TO_WIN32_HANDLE
		636	anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
		637	#else
		638	anfd->handle = _get_osfhandle (fd);
		639	#endif
		640	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		641	}
		642	#endif
		643
		644	{
		645	unsigned char o_events = anfd->events;
		646	unsigned char o_reify = anfd->reify;
		647
		648	anfd->reify = 0;
		649	anfd->events = events;
		650
		651	if (o_events != events || o_reify & EV_IOFDSET)
		652	backend_modify (EV_A_ fd, o_events, events);
76	}	653	}
		654	}
		655
		656	fdchangecnt = 0;
		657	}
		658
		659	void inline_size
		660	fd_change (EV_P_ int fd, int flags)
		661	{
		662	unsigned char reify = anfds [fd].reify;
		663	anfds [fd].reify |= flags;
		664
		665	if (expect_true (!reify))
		666	{
		667	++fdchangecnt;
		668	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		669	fdchanges [fdchangecnt - 1] = fd;
		670	}
		671	}
		672
		673	void inline_speed
		674	fd_kill (EV_P_ int fd)
		675	{
		676	ev_io *w;
		677
		678	while ((w = (ev_io *)anfds [fd].head))
		679	{
		680	ev_io_stop (EV_A_ w);
		681	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		682	}
		683	}
		684
		685	int inline_size
		686	fd_valid (int fd)
		687	{
		688	#ifdef _WIN32
		689	return _get_osfhandle (fd) != -1;
		690	#else
		691	return fcntl (fd, F_GETFD) != -1;
		692	#endif
		693	}
		694
		695	/* called on EBADF to verify fds */
		696	static void noinline
		697	fd_ebadf (EV_P)
		698	{
		699	int fd;
		700
		701	for (fd = 0; fd < anfdmax; ++fd)
		702	if (anfds [fd].events)
		703	if (!fd_valid (fd) == -1 && errno == EBADF)
		704	fd_kill (EV_A_ fd);
		705	}
		706
		707	/* called on ENOMEM in select/poll to kill some fds and retry */
		708	static void noinline
		709	fd_enomem (EV_P)
		710	{
		711	int fd;
		712
		713	for (fd = anfdmax; fd--; )
		714	if (anfds [fd].events)
		715	{
		716	fd_kill (EV_A_ fd);
		717	return;
		718	}
		719	}
		720
		721	/* usually called after fork if backend needs to re-arm all fds from scratch */
		722	static void noinline
		723	fd_rearm_all (EV_P)
		724	{
		725	int fd;
		726
		727	for (fd = 0; fd < anfdmax; ++fd)
		728	if (anfds [fd].events)
		729	{
		730	anfds [fd].events = 0;
		731	fd_change (EV_A_ fd, EV_IOFDSET | 1);
		732	}
		733	}
		734
		735	/*****************************************************************************/
		736
		737	void inline_speed
		738	upheap (WT *heap, int k)
		739	{
		740	WT w = heap [k];
		741
		742	while (k)
		743	{
		744	int p = (k - 1) >> 1;
		745
		746	if (heap [p]->at <= w->at)
		747	break;
		748
		749	heap [k] = heap [p];
		750	((W)heap [k])->active = k + 1;
		751	k = p;
		752	}
		753
		754	heap [k] = w;
		755	((W)heap [k])->active = k + 1;
		756	}
		757
		758	void inline_speed
		759	downheap (WT *heap, int N, int k)
		760	{
		761	WT w = heap [k];
		762
		763	for (;;)
		764	{
		765	int c = (k << 1) + 1;
		766
		767	if (c >= N)
		768	break;
		769
		770	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		771	? 1 : 0;
		772
		773	if (w->at <= heap [c]->at)
		774	break;
		775
		776	heap [k] = heap [c];
		777	((W)heap [k])->active = k + 1;
		778
		779	k = c;
		780	}
		781
		782	heap [k] = w;
		783	((W)heap [k])->active = k + 1;
		784	}
		785
		786	void inline_size
		787	adjustheap (WT *heap, int N, int k)
		788	{
		789	upheap (heap, k);
		790	downheap (heap, N, k);
		791	}
		792
		793	/*****************************************************************************/
77		794
78	typedef struct	795	typedef struct
79	{	796	{
80	struct ev_io *head;	797	WL head;
81	unsigned char wev, rev; /* want, received event set */	798	EV_ATOMIC_T gotsig;
82	} ANFD;	799	} ANSIG;
83		800
84	static ANFD *anfds;	801	static ANSIG *signals;
85	static int anfdmax;	802	static int signalmax;
86		803
87	static int *fdchanges;	804	static EV_ATOMIC_T gotsig;
88	static int fdchangemax, fdchangecnt;	805
		806	void inline_size
		807	signals_init (ANSIG *base, int count)
		808	{
		809	while (count--)
		810	{
		811	base->head = 0;
		812	base->gotsig = 0;
		813
		814	++base;
		815	}
		816	}
		817
		818	/*****************************************************************************/
		819
		820	void inline_speed
		821	fd_intern (int fd)
		822	{
		823	#ifdef _WIN32
		824	int arg = 1;
		825	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		826	#else
		827	fcntl (fd, F_SETFD, FD_CLOEXEC);
		828	fcntl (fd, F_SETFL, O_NONBLOCK);
		829	#endif
		830	}
		831
		832	static void noinline
		833	evpipe_init (EV_P)
		834	{
		835	if (!ev_is_active (&pipeev))
		836	{
		837	#if EV_USE_EVENTFD
		838	if ((evfd = eventfd (0, 0)) >= 0)
		839	{
		840	evpipe [0] = -1;
		841	fd_intern (evfd);
		842	ev_io_set (&pipeev, evfd, EV_READ);
		843	}
		844	else
		845	#endif
		846	{
		847	while (pipe (evpipe))
		848	syserr ("(libev) error creating signal/async pipe");
		849
		850	fd_intern (evpipe [0]);
		851	fd_intern (evpipe [1]);
		852	ev_io_set (&pipeev, evpipe [0], EV_READ);
		853	}
		854
		855	ev_io_start (EV_A_ &pipeev);
		856	ev_unref (EV_A); /* watcher should not keep loop alive */
		857	}
		858	}
		859
		860	void inline_size
		861	evpipe_write (EV_P_ EV_ATOMIC_T *flag)
		862	{
		863	if (!*flag)
		864	{
		865	int old_errno = errno; /* save errno because write might clobber it */
		866
		867	*flag = 1;
		868
		869	#if EV_USE_EVENTFD
		870	if (evfd >= 0)
		871	{
		872	uint64_t counter = 1;
		873	write (evfd, &counter, sizeof (uint64_t));
		874	}
		875	else
		876	#endif
		877	write (evpipe [1], &old_errno, 1);
		878
		879	errno = old_errno;
		880	}
		881	}
89		882
90	static void	883	static void
91	anfds_init (ANFD *base, int count)	884	pipecb (EV_P_ ev_io *iow, int revents)
92	{	885	{
93	while (count--)	886	#if EV_USE_EVENTFD
94	{	887	if (evfd >= 0)
95	base->head = 0;
96	base->wev = base->rev = EV_NONE;
97	++base;
98	}	888	{
99	}	889	uint64_t counter = 1;
		890	read (evfd, &counter, sizeof (uint64_t));
		891	}
		892	else
		893	#endif
		894	{
		895	char dummy;
		896	read (evpipe [0], &dummy, 1);
		897	}
100		898
101	typedef struct	899	if (gotsig && ev_is_default_loop (EV_A))
102	{	900	{
103	struct ev_watcher *w;	901	int signum;
104	int events;	902	gotsig = 0;
105	} ANPENDING;
106		903
107	static ANPENDING *pendings;	904	for (signum = signalmax; signum--; )
108	static int pendingmax, pendingcnt;	905	if (signals [signum].gotsig)
		906	ev_feed_signal_event (EV_A_ signum + 1);
		907	}
		908
		909	#if EV_ASYNC_ENABLE
		910	if (gotasync)
		911	{
		912	int i;
		913	gotasync = 0;
		914
		915	for (i = asynccnt; i--; )
		916	if (asyncs [i]->sent)
		917	{
		918	asyncs [i]->sent = 0;
		919	ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
		920	}
		921	}
		922	#endif
		923	}
		924
		925	/*****************************************************************************/
109		926
110	static void	927	static void
111	event (struct ev_watcher *w, int events)	928	ev_sighandler (int signum)
112	{	929	{
113	w->pending = ++pendingcnt;	930	#if EV_MULTIPLICITY
114	array_needsize (pendings, pendingmax, pendingcnt, );	931	struct ev_loop *loop = &default_loop_struct;
115	pendings [pendingcnt - 1].w = w;	932	#endif
116	pendings [pendingcnt - 1].events = events;	933
		934	#if _WIN32
		935	signal (signum, ev_sighandler);
		936	#endif
		937
		938	signals [signum - 1].gotsig = 1;
		939	evpipe_write (EV_A_ &gotsig);
117	}	940	}
		941
		942	void noinline
		943	ev_feed_signal_event (EV_P_ int signum)
		944	{
		945	WL w;
		946
		947	#if EV_MULTIPLICITY
		948	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		949	#endif
		950
		951	--signum;
		952
		953	if (signum < 0 || signum >= signalmax)
		954	return;
		955
		956	signals [signum].gotsig = 0;
		957
		958	for (w = signals [signum].head; w; w = w->next)
		959	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		960	}
		961
		962	/*****************************************************************************/
		963
		964	static WL childs [EV_PID_HASHSIZE];
		965
		966	#ifndef _WIN32
		967
		968	static ev_signal childev;
		969
		970	#ifndef WIFCONTINUED
		971	# define WIFCONTINUED(status) 0
		972	#endif
		973
		974	void inline_speed
		975	child_reap (EV_P_ int chain, int pid, int status)
		976	{
		977	ev_child *w;
		978	int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
		979
		980	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		981	{
		982	if ((w->pid == pid || !w->pid)
		983	&& (!traced || (w->flags & 1)))
		984	{
		985	ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
		986	w->rpid = pid;
		987	w->rstatus = status;
		988	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		989	}
		990	}
		991	}
		992
		993	#ifndef WCONTINUED
		994	# define WCONTINUED 0
		995	#endif
118		996
119	static void	997	static void
120	fd_event (int fd, int events)	998	childcb (EV_P_ ev_signal *sw, int revents)
121	{	999	{
122	ANFD *anfd = anfds + fd;	1000	int pid, status;
123	struct ev_io *w;
124		1001
125	for (w = anfd->head; w; w = w->next)	1002	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
126	{	1003	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
127	int ev = w->events & events;	1004	if (!WCONTINUED
		1005	|| errno != EINVAL
		1006	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		1007	return;
128		1008
129	if (ev)	1009	/* make sure we are called again until all children have been reaped */
130	event ((struct ev_watcher *)w, ev);	1010	/* we need to do it this way so that the callback gets called before we continue */
131	}	1011	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
132	}
133		1012
134	static struct ev_timer **timers;	1013	child_reap (EV_A_ pid, pid, status);
135	static int timermax, timercnt;	1014	if (EV_PID_HASHSIZE > 1)
136		1015	child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
137	static void
138	upheap (int k)
139	{
140	struct ev_timer *w = timers [k];
141
142	while (k && timers [k >> 1]->at > w->at)
143	{
144	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;
146	k >>= 1;
147	}
148
149	timers [k] = w;
150	timers [k]->active = k + 1;
151
152	}	1016	}
153		1017
154	static void	1018	#endif
155	downheap (int k)
156	{
157	struct ev_timer *w = timers [k];
158		1019
159	while (k < (timercnt >> 1))	1020	/*****************************************************************************/
160	{
161	int j = k << 1;
162		1021
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	1022	#if EV_USE_PORT
164	++j;	1023	# include "ev_port.c"
165		1024	#endif
166	if (w->at <= timers [j]->at)	1025	#if EV_USE_KQUEUE
167	break;	1026	# include "ev_kqueue.c"
168		1027	#endif
169	timers [k] = timers [j];
170	timers [k]->active = k + 1;
171	k = j;
172	}
173
174	timers [k] = w;
175	timers [k]->active = k + 1;
176	}
177
178	static struct ev_signal **signals;
179	static int signalmax, signalcnt;
180
181	static void
182	signals_init (struct ev_signal **base, int count)
183	{
184	while (count--)
185	*base++ = 0;
186	}
187
188	#if HAVE_EPOLL	1028	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	1029	# include "ev_epoll.c"
190	#endif	1030	#endif
		1031	#if EV_USE_POLL
		1032	# include "ev_poll.c"
		1033	#endif
191	#if HAVE_SELECT	1034	#if EV_USE_SELECT
192	# include "ev_select.c"	1035	# include "ev_select.c"
193	#endif	1036	#endif
194		1037
195	int ev_init (int flags)	1038	int
		1039	ev_version_major (void)
196	{	1040	{
		1041	return EV_VERSION_MAJOR;
		1042	}
		1043
		1044	int
		1045	ev_version_minor (void)
		1046	{
		1047	return EV_VERSION_MINOR;
		1048	}
		1049
		1050	/* return true if we are running with elevated privileges and should ignore env variables */
		1051	int inline_size
		1052	enable_secure (void)
		1053	{
		1054	#ifdef _WIN32
		1055	return 0;
		1056	#else
		1057	return getuid () != geteuid ()
		1058	|| getgid () != getegid ();
		1059	#endif
		1060	}
		1061
		1062	unsigned int
		1063	ev_supported_backends (void)
		1064	{
		1065	unsigned int flags = 0;
		1066
		1067	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		1068	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		1069	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		1070	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		1071	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		1072
		1073	return flags;
		1074	}
		1075
		1076	unsigned int
		1077	ev_recommended_backends (void)
		1078	{
		1079	unsigned int flags = ev_supported_backends ();
		1080
		1081	#ifndef __NetBSD__
		1082	/* kqueue is borked on everything but netbsd apparently */
		1083	/* it usually doesn't work correctly on anything but sockets and pipes */
		1084	flags &= ~EVBACKEND_KQUEUE;
		1085	#endif
		1086	#ifdef __APPLE__
		1087	// flags &= ~EVBACKEND_KQUEUE; for documentation
		1088	flags &= ~EVBACKEND_POLL;
		1089	#endif
		1090
		1091	return flags;
		1092	}
		1093
		1094	unsigned int
		1095	ev_embeddable_backends (void)
		1096	{
		1097	int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
		1098
		1099	/* epoll embeddability broken on all linux versions up to at least 2.6.23 */
		1100	/* please fix it and tell me how to detect the fix */
		1101	flags &= ~EVBACKEND_EPOLL;
		1102
		1103	return flags;
		1104	}
		1105
		1106	unsigned int
		1107	ev_backend (EV_P)
		1108	{
		1109	return backend;
		1110	}
		1111
		1112	unsigned int
		1113	ev_loop_count (EV_P)
		1114	{
		1115	return loop_count;
		1116	}
		1117
		1118	void
		1119	ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
		1120	{
		1121	io_blocktime = interval;
		1122	}
		1123
		1124	void
		1125	ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
		1126	{
		1127	timeout_blocktime = interval;
		1128	}
		1129
		1130	static void noinline
		1131	loop_init (EV_P_ unsigned int flags)
		1132	{
		1133	if (!backend)
		1134	{
197	#if HAVE_MONOTONIC	1135	#if EV_USE_MONOTONIC
198	{	1136	{
199	struct timespec ts;	1137	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	1138	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	1139	have_monotonic = 1;
202	}	1140	}
203	#endif	1141	#endif
204		1142
205	ev_now = ev_time ();	1143	ev_rt_now = ev_time ();
		1144	mn_now = get_clock ();
		1145	now_floor = mn_now;
		1146	rtmn_diff = ev_rt_now - mn_now;
206		1147
		1148	io_blocktime = 0.;
		1149	timeout_blocktime = 0.;
		1150	backend = 0;
		1151	backend_fd = -1;
		1152	gotasync = 0;
		1153	#if EV_USE_INOTIFY
		1154	fs_fd = -2;
		1155	#endif
		1156
		1157	/* pid check not overridable via env */
		1158	#ifndef _WIN32
		1159	if (flags & EVFLAG_FORKCHECK)
		1160	curpid = getpid ();
		1161	#endif
		1162
		1163	if (!(flags & EVFLAG_NOENV)
		1164	&& !enable_secure ()
		1165	&& getenv ("LIBEV_FLAGS"))
		1166	flags = atoi (getenv ("LIBEV_FLAGS"));
		1167
		1168	if (!(flags & 0x0000ffffUL))
		1169	flags |= ev_recommended_backends ();
		1170
		1171	#if EV_USE_PORT
		1172	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		1173	#endif
		1174	#if EV_USE_KQUEUE
		1175	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		1176	#endif
207	#if HAVE_EPOLL	1177	#if EV_USE_EPOLL
208	if (epoll_init (flags))	1178	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
209	return ev_method;
210	#endif	1179	#endif
		1180	#if EV_USE_POLL
		1181	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		1182	#endif
211	#if HAVE_SELECT	1183	#if EV_USE_SELECT
212	if (select_init (flags))	1184	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
213	return ev_method;
214	#endif	1185	#endif
215		1186
216	ev_method = EVMETHOD_NONE;	1187	ev_init (&pipeev, pipecb);
217	return ev_method;	1188	ev_set_priority (&pipeev, EV_MAXPRI);
		1189	}
218	}	1190	}
219		1191
220	void ev_prefork (void)	1192	static void noinline
221	{	1193	loop_destroy (EV_P)
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void
236	call_pending ()
237	{	1194	{
238	int i;	1195	int i;
239		1196
240	for (i = 0; i < pendingcnt; ++i)	1197	if (ev_is_active (&pipeev))
241	{	1198	{
242	ANPENDING *p = pendings + i;	1199	ev_ref (EV_A); /* signal watcher */
		1200	ev_io_stop (EV_A_ &pipeev);
243		1201
244	if (p->w)	1202	#if EV_USE_EVENTFD
		1203	if (evfd >= 0)
		1204	close (evfd);
		1205	#endif
		1206
		1207	if (evpipe [0] >= 0)
245	{	1208	{
246	p->w->pending = 0;	1209	close (evpipe [0]);
247	p->w->cb (p->w, p->events);	1210	close (evpipe [1]);
248	}	1211	}
249	}	1212	}
250		1213
251	pendingcnt = 0;	1214	#if EV_USE_INOTIFY
252	}	1215	if (fs_fd >= 0)
		1216	close (fs_fd);
		1217	#endif
253		1218
254	static void	1219	if (backend_fd >= 0)
		1220	close (backend_fd);
		1221
		1222	#if EV_USE_PORT
		1223	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1224	#endif
		1225	#if EV_USE_KQUEUE
		1226	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1227	#endif
		1228	#if EV_USE_EPOLL
		1229	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1230	#endif
		1231	#if EV_USE_POLL
		1232	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1233	#endif
		1234	#if EV_USE_SELECT
		1235	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1236	#endif
		1237
		1238	for (i = NUMPRI; i--; )
		1239	{
		1240	array_free (pending, [i]);
		1241	#if EV_IDLE_ENABLE
		1242	array_free (idle, [i]);
		1243	#endif
		1244	}
		1245
		1246	ev_free (anfds); anfdmax = 0;
		1247
		1248	/* have to use the microsoft-never-gets-it-right macro */
		1249	array_free (fdchange, EMPTY);
		1250	array_free (timer, EMPTY);
		1251	#if EV_PERIODIC_ENABLE
		1252	array_free (periodic, EMPTY);
		1253	#endif
		1254	#if EV_FORK_ENABLE
		1255	array_free (fork, EMPTY);
		1256	#endif
		1257	array_free (prepare, EMPTY);
		1258	array_free (check, EMPTY);
		1259	#if EV_ASYNC_ENABLE
		1260	array_free (async, EMPTY);
		1261	#endif
		1262
		1263	backend = 0;
		1264	}
		1265
		1266	void inline_size infy_fork (EV_P);
		1267
		1268	void inline_size
		1269	loop_fork (EV_P)
		1270	{
		1271	#if EV_USE_PORT
		1272	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1273	#endif
		1274	#if EV_USE_KQUEUE
		1275	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1276	#endif
		1277	#if EV_USE_EPOLL
		1278	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1279	#endif
		1280	#if EV_USE_INOTIFY
		1281	infy_fork (EV_A);
		1282	#endif
		1283
		1284	if (ev_is_active (&pipeev))
		1285	{
		1286	/* this "locks" the handlers against writing to the pipe */
		1287	/* while we modify the fd vars */
		1288	gotsig = 1;
		1289	#if EV_ASYNC_ENABLE
		1290	gotasync = 1;
		1291	#endif
		1292
		1293	ev_ref (EV_A);
		1294	ev_io_stop (EV_A_ &pipeev);
		1295
		1296	#if EV_USE_EVENTFD
		1297	if (evfd >= 0)
		1298	close (evfd);
		1299	#endif
		1300
		1301	if (evpipe [0] >= 0)
		1302	{
		1303	close (evpipe [0]);
		1304	close (evpipe [1]);
		1305	}
		1306
		1307	evpipe_init (EV_A);
		1308	/* now iterate over everything, in case we missed something */
		1309	pipecb (EV_A_ &pipeev, EV_READ);
		1310	}
		1311
		1312	postfork = 0;
		1313	}
		1314
		1315	#if EV_MULTIPLICITY
		1316	struct ev_loop *
		1317	ev_loop_new (unsigned int flags)
		1318	{
		1319	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1320
		1321	memset (loop, 0, sizeof (struct ev_loop));
		1322
		1323	loop_init (EV_A_ flags);
		1324
		1325	if (ev_backend (EV_A))
		1326	return loop;
		1327
		1328	return 0;
		1329	}
		1330
		1331	void
		1332	ev_loop_destroy (EV_P)
		1333	{
		1334	loop_destroy (EV_A);
		1335	ev_free (loop);
		1336	}
		1337
		1338	void
		1339	ev_loop_fork (EV_P)
		1340	{
		1341	postfork = 1; /* must be in line with ev_default_fork */
		1342	}
		1343
		1344	#endif
		1345
		1346	#if EV_MULTIPLICITY
		1347	struct ev_loop *
		1348	ev_default_loop_init (unsigned int flags)
		1349	#else
		1350	int
		1351	ev_default_loop (unsigned int flags)
		1352	#endif
		1353	{
		1354	if (!ev_default_loop_ptr)
		1355	{
		1356	#if EV_MULTIPLICITY
		1357	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1358	#else
		1359	ev_default_loop_ptr = 1;
		1360	#endif
		1361
		1362	loop_init (EV_A_ flags);
		1363
		1364	if (ev_backend (EV_A))
		1365	{
		1366	#ifndef _WIN32
		1367	ev_signal_init (&childev, childcb, SIGCHLD);
		1368	ev_set_priority (&childev, EV_MAXPRI);
		1369	ev_signal_start (EV_A_ &childev);
		1370	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1371	#endif
		1372	}
		1373	else
		1374	ev_default_loop_ptr = 0;
		1375	}
		1376
		1377	return ev_default_loop_ptr;
		1378	}
		1379
		1380	void
		1381	ev_default_destroy (void)
		1382	{
		1383	#if EV_MULTIPLICITY
		1384	struct ev_loop *loop = ev_default_loop_ptr;
		1385	#endif
		1386
		1387	#ifndef _WIN32
		1388	ev_ref (EV_A); /* child watcher */
		1389	ev_signal_stop (EV_A_ &childev);
		1390	#endif
		1391
		1392	loop_destroy (EV_A);
		1393	}
		1394
		1395	void
		1396	ev_default_fork (void)
		1397	{
		1398	#if EV_MULTIPLICITY
		1399	struct ev_loop *loop = ev_default_loop_ptr;
		1400	#endif
		1401
		1402	if (backend)
		1403	postfork = 1; /* must be in line with ev_loop_fork */
		1404	}
		1405
		1406	/*****************************************************************************/
		1407
		1408	void
		1409	ev_invoke (EV_P_ void *w, int revents)
		1410	{
		1411	EV_CB_INVOKE ((W)w, revents);
		1412	}
		1413
		1414	void inline_speed
		1415	call_pending (EV_P)
		1416	{
		1417	int pri;
		1418
		1419	for (pri = NUMPRI; pri--; )
		1420	while (pendingcnt [pri])
		1421	{
		1422	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1423
		1424	if (expect_true (p->w))
		1425	{
		1426	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1427
		1428	p->w->pending = 0;
		1429	EV_CB_INVOKE (p->w, p->events);
		1430	}
		1431	}
		1432	}
		1433
		1434	void inline_size
255	timer_reify (void)	1435	timers_reify (EV_P)
256	{	1436	{
257	while (timercnt && timers [0]->at <= ev_now)	1437	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	1438	{
259	struct ev_timer *w = timers [0];	1439	ev_timer *w = (ev_timer *)timers [0];
260		1440
		1441	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
		1442
261	/* first reschedule timer */	1443	/* first reschedule or stop timer */
262	if (w->repeat)	1444	if (w->repeat)
263	{	1445	{
264	if (w->is_abs)	1446	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1447
266	else
267	w->at = ev_now + w->repeat;	1448	((WT)w)->at += w->repeat;
		1449	if (((WT)w)->at < mn_now)
		1450	((WT)w)->at = mn_now;
268		1451
269	downheap (0);	1452	downheap (timers, timercnt, 0);
270	}	1453	}
271	else	1454	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1455	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1456
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1457	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1458	}
		1459	}
		1460
		1461	#if EV_PERIODIC_ENABLE
		1462	void inline_size
		1463	periodics_reify (EV_P)
		1464	{
		1465	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	1466	{
276	}	1467	ev_periodic *w = (ev_periodic *)periodics [0];
277		1468
278	int ev_loop_done;	1469	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
279		1470
		1471	/* first reschedule or stop timer */
		1472	if (w->reschedule_cb)
		1473	{
		1474	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
		1475	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1476	downheap (periodics, periodiccnt, 0);
		1477	}
		1478	else if (w->interval)
		1479	{
		1480	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1481	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1482	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1483	downheap (periodics, periodiccnt, 0);
		1484	}
		1485	else
		1486	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1487
		1488	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1489	}
		1490	}
		1491
		1492	static void noinline
		1493	periodics_reschedule (EV_P)
		1494	{
		1495	int i;
		1496
		1497	/* adjust periodics after time jump */
		1498	for (i = 0; i < periodiccnt; ++i)
		1499	{
		1500	ev_periodic *w = (ev_periodic *)periodics [i];
		1501
		1502	if (w->reschedule_cb)
		1503	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1504	else if (w->interval)
		1505	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1506	}
		1507
		1508	/* now rebuild the heap */
		1509	for (i = periodiccnt >> 1; i--; )
		1510	downheap (periodics, periodiccnt, i);
		1511	}
		1512	#endif
		1513
		1514	#if EV_IDLE_ENABLE
		1515	void inline_size
		1516	idle_reify (EV_P)
		1517	{
		1518	if (expect_false (idleall))
		1519	{
		1520	int pri;
		1521
		1522	for (pri = NUMPRI; pri--; )
		1523	{
		1524	if (pendingcnt [pri])
		1525	break;
		1526
		1527	if (idlecnt [pri])
		1528	{
		1529	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1530	break;
		1531	}
		1532	}
		1533	}
		1534	}
		1535	#endif
		1536
		1537	void inline_speed
		1538	time_update (EV_P_ ev_tstamp max_block)
		1539	{
		1540	int i;
		1541
		1542	#if EV_USE_MONOTONIC
		1543	if (expect_true (have_monotonic))
		1544	{
		1545	ev_tstamp odiff = rtmn_diff;
		1546
		1547	mn_now = get_clock ();
		1548
		1549	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1550	/* interpolate in the meantime */
		1551	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1552	{
		1553	ev_rt_now = rtmn_diff + mn_now;
		1554	return;
		1555	}
		1556
		1557	now_floor = mn_now;
		1558	ev_rt_now = ev_time ();
		1559
		1560	/* loop a few times, before making important decisions.
		1561	* on the choice of "4": one iteration isn't enough,
		1562	* in case we get preempted during the calls to
		1563	* ev_time and get_clock. a second call is almost guaranteed
		1564	* to succeed in that case, though. and looping a few more times
		1565	* doesn't hurt either as we only do this on time-jumps or
		1566	* in the unlikely event of having been preempted here.
		1567	*/
		1568	for (i = 4; --i; )
		1569	{
		1570	rtmn_diff = ev_rt_now - mn_now;
		1571
		1572	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1573	return; /* all is well */
		1574
		1575	ev_rt_now = ev_time ();
		1576	mn_now = get_clock ();
		1577	now_floor = mn_now;
		1578	}
		1579
		1580	# if EV_PERIODIC_ENABLE
		1581	periodics_reschedule (EV_A);
		1582	# endif
		1583	/* no timer adjustment, as the monotonic clock doesn't jump */
		1584	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1585	}
		1586	else
		1587	#endif
		1588	{
		1589	ev_rt_now = ev_time ();
		1590
		1591	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
		1592	{
		1593	#if EV_PERIODIC_ENABLE
		1594	periodics_reschedule (EV_A);
		1595	#endif
		1596	/* adjust timers. this is easy, as the offset is the same for all of them */
		1597	for (i = 0; i < timercnt; ++i)
		1598	((WT)timers [i])->at += ev_rt_now - mn_now;
		1599	}
		1600
		1601	mn_now = ev_rt_now;
		1602	}
		1603	}
		1604
		1605	void
		1606	ev_ref (EV_P)
		1607	{
		1608	++activecnt;
		1609	}
		1610
		1611	void
		1612	ev_unref (EV_P)
		1613	{
		1614	--activecnt;
		1615	}
		1616
		1617	static int loop_done;
		1618
		1619	void
280	int ev_loop (int flags)	1620	ev_loop (EV_P_ int flags)
281	{	1621	{
282	double block;	1622	loop_done = EVUNLOOP_CANCEL;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1623
		1624	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
284		1625
285	do	1626	do
286	{	1627	{
		1628	#ifndef _WIN32
		1629	if (expect_false (curpid)) /* penalise the forking check even more */
		1630	if (expect_false (getpid () != curpid))
		1631	{
		1632	curpid = getpid ();
		1633	postfork = 1;
		1634	}
		1635	#endif
		1636
		1637	#if EV_FORK_ENABLE
		1638	/* we might have forked, so queue fork handlers */
		1639	if (expect_false (postfork))
		1640	if (forkcnt)
		1641	{
		1642	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1643	call_pending (EV_A);
		1644	}
		1645	#endif
		1646
		1647	/* queue prepare watchers (and execute them) */
		1648	if (expect_false (preparecnt))
		1649	{
		1650	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1651	call_pending (EV_A);
		1652	}
		1653
		1654	if (expect_false (!activecnt))
		1655	break;
		1656
		1657	/* we might have forked, so reify kernel state if necessary */
		1658	if (expect_false (postfork))
		1659	loop_fork (EV_A);
		1660
287	/* update fd-related kernel structures */	1661	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1662	fd_reify (EV_A);
289		1663
290	/* calculate blocking time */	1664	/* calculate blocking time */
291	ev_now = ev_time ();	1665	{
		1666	ev_tstamp waittime = 0.;
		1667	ev_tstamp sleeptime = 0.;
292		1668
293	if (flags & EVLOOP_NONBLOCK)	1669	if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
294	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else
298	{	1670	{
299	block = timers [0]->at - ev_now + method_fudge;	1671	/* update time to cancel out callback processing overhead */
300	if (block < 0.) block = 0.;	1672	time_update (EV_A_ 1e100);
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;	1673
		1674	waittime = MAX_BLOCKTIME;
		1675
		1676	if (timercnt)
		1677	{
		1678	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
		1679	if (waittime > to) waittime = to;
		1680	}
		1681
		1682	#if EV_PERIODIC_ENABLE
		1683	if (periodiccnt)
		1684	{
		1685	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
		1686	if (waittime > to) waittime = to;
		1687	}
		1688	#endif
		1689
		1690	if (expect_false (waittime < timeout_blocktime))
		1691	waittime = timeout_blocktime;
		1692
		1693	sleeptime = waittime - backend_fudge;
		1694
		1695	if (expect_true (sleeptime > io_blocktime))
		1696	sleeptime = io_blocktime;
		1697
		1698	if (sleeptime)
		1699	{
		1700	ev_sleep (sleeptime);
		1701	waittime -= sleeptime;
		1702	}
302	}	1703	}
303		1704
304	method_poll (block);	1705	++loop_count;
		1706	backend_poll (EV_A_ waittime);
305		1707
		1708	/* update ev_rt_now, do magic */
		1709	time_update (EV_A_ waittime + sleeptime);
		1710	}
		1711
306	/* put pending timers into pendign queue and reschedule them */	1712	/* queue pending timers and reschedule them */
		1713	timers_reify (EV_A); /* relative timers called last */
		1714	#if EV_PERIODIC_ENABLE
		1715	periodics_reify (EV_A); /* absolute timers called first */
		1716	#endif
		1717
		1718	#if EV_IDLE_ENABLE
		1719	/* queue idle watchers unless other events are pending */
307	timer_reify ();	1720	idle_reify (EV_A);
		1721	#endif
308		1722
309	ev_now = ev_time ();	1723	/* queue check watchers, to be executed first */
		1724	if (expect_false (checkcnt))
		1725	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1726
310	call_pending ();	1727	call_pending (EV_A);
311	}	1728	}
312	while (!ev_loop_done);	1729	while (expect_true (
313	}	1730	activecnt
		1731	&& !loop_done
		1732	&& !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
		1733	));
314		1734
315	static void	1735	if (loop_done == EVUNLOOP_ONE)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1736	loop_done = EVUNLOOP_CANCEL;
		1737	}
		1738
		1739	void
		1740	ev_unloop (EV_P_ int how)
		1741	{
		1742	loop_done = how;
		1743	}
		1744
		1745	/*****************************************************************************/
		1746
		1747	void inline_size
		1748	wlist_add (WL *head, WL elem)
317	{	1749	{
318	elem->next = *head;	1750	elem->next = *head;
319	*head = elem;	1751	*head = elem;
320	}	1752	}
321		1753
322	static void	1754	void inline_size
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1755	wlist_del (WL *head, WL elem)
324	{	1756	{
325	while (*head)	1757	while (*head)
326	{	1758	{
327	if (*head == elem)	1759	if (*head == elem)
328	{	1760	{
…		…
332		1764
333	head = &(*head)->next;	1765	head = &(*head)->next;
334	}	1766	}
335	}	1767	}
336		1768
		1769	void inline_speed
		1770	clear_pending (EV_P_ W w)
		1771	{
		1772	if (w->pending)
		1773	{
		1774	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1775	w->pending = 0;
		1776	}
		1777	}
		1778
		1779	int
		1780	ev_clear_pending (EV_P_ void *w)
		1781	{
		1782	W w_ = (W)w;
		1783	int pending = w_->pending;
		1784
		1785	if (expect_true (pending))
		1786	{
		1787	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1788	w_->pending = 0;
		1789	p->w = 0;
		1790	return p->events;
		1791	}
		1792	else
		1793	return 0;
		1794	}
		1795
		1796	void inline_size
		1797	pri_adjust (EV_P_ W w)
		1798	{
		1799	int pri = w->priority;
		1800	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1801	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1802	w->priority = pri;
		1803	}
		1804
		1805	void inline_speed
		1806	ev_start (EV_P_ W w, int active)
		1807	{
		1808	pri_adjust (EV_A_ w);
		1809	w->active = active;
		1810	ev_ref (EV_A);
		1811	}
		1812
		1813	void inline_size
		1814	ev_stop (EV_P_ W w)
		1815	{
		1816	ev_unref (EV_A);
		1817	w->active = 0;
		1818	}
		1819
		1820	/*****************************************************************************/
		1821
		1822	void noinline
		1823	ev_io_start (EV_P_ ev_io *w)
		1824	{
		1825	int fd = w->fd;
		1826
		1827	if (expect_false (ev_is_active (w)))
		1828	return;
		1829
		1830	assert (("ev_io_start called with negative fd", fd >= 0));
		1831
		1832	ev_start (EV_A_ (W)w, 1);
		1833	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1834	wlist_add (&anfds[fd].head, (WL)w);
		1835
		1836	fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
		1837	w->events &= ~EV_IOFDSET;
		1838	}
		1839
		1840	void noinline
		1841	ev_io_stop (EV_P_ ev_io *w)
		1842	{
		1843	clear_pending (EV_A_ (W)w);
		1844	if (expect_false (!ev_is_active (w)))
		1845	return;
		1846
		1847	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1848
		1849	wlist_del (&anfds[w->fd].head, (WL)w);
		1850	ev_stop (EV_A_ (W)w);
		1851
		1852	fd_change (EV_A_ w->fd, 1);
		1853	}
		1854
		1855	void noinline
		1856	ev_timer_start (EV_P_ ev_timer *w)
		1857	{
		1858	if (expect_false (ev_is_active (w)))
		1859	return;
		1860
		1861	((WT)w)->at += mn_now;
		1862
		1863	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1864
		1865	ev_start (EV_A_ (W)w, ++timercnt);
		1866	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1867	timers [timercnt - 1] = (WT)w;
		1868	upheap (timers, timercnt - 1);
		1869
		1870	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1871	}
		1872
		1873	void noinline
		1874	ev_timer_stop (EV_P_ ev_timer *w)
		1875	{
		1876	clear_pending (EV_A_ (W)w);
		1877	if (expect_false (!ev_is_active (w)))
		1878	return;
		1879
		1880	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1881
		1882	{
		1883	int active = ((W)w)->active;
		1884
		1885	if (expect_true (--active < --timercnt))
		1886	{
		1887	timers [active] = timers [timercnt];
		1888	adjustheap (timers, timercnt, active);
		1889	}
		1890	}
		1891
		1892	((WT)w)->at -= mn_now;
		1893
		1894	ev_stop (EV_A_ (W)w);
		1895	}
		1896
		1897	void noinline
		1898	ev_timer_again (EV_P_ ev_timer *w)
		1899	{
		1900	if (ev_is_active (w))
		1901	{
		1902	if (w->repeat)
		1903	{
		1904	((WT)w)->at = mn_now + w->repeat;
		1905	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1906	}
		1907	else
		1908	ev_timer_stop (EV_A_ w);
		1909	}
		1910	else if (w->repeat)
		1911	{
		1912	w->at = w->repeat;
		1913	ev_timer_start (EV_A_ w);
		1914	}
		1915	}
		1916
		1917	#if EV_PERIODIC_ENABLE
		1918	void noinline
		1919	ev_periodic_start (EV_P_ ev_periodic *w)
		1920	{
		1921	if (expect_false (ev_is_active (w)))
		1922	return;
		1923
		1924	if (w->reschedule_cb)
		1925	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1926	else if (w->interval)
		1927	{
		1928	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1929	/* this formula differs from the one in periodic_reify because we do not always round up */
		1930	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1931	}
		1932	else
		1933	((WT)w)->at = w->offset;
		1934
		1935	ev_start (EV_A_ (W)w, ++periodiccnt);
		1936	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
		1937	periodics [periodiccnt - 1] = (WT)w;
		1938	upheap (periodics, periodiccnt - 1);
		1939
		1940	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1941	}
		1942
		1943	void noinline
		1944	ev_periodic_stop (EV_P_ ev_periodic *w)
		1945	{
		1946	clear_pending (EV_A_ (W)w);
		1947	if (expect_false (!ev_is_active (w)))
		1948	return;
		1949
		1950	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1951
		1952	{
		1953	int active = ((W)w)->active;
		1954
		1955	if (expect_true (--active < --periodiccnt))
		1956	{
		1957	periodics [active] = periodics [periodiccnt];
		1958	adjustheap (periodics, periodiccnt, active);
		1959	}
		1960	}
		1961
		1962	ev_stop (EV_A_ (W)w);
		1963	}
		1964
		1965	void noinline
		1966	ev_periodic_again (EV_P_ ev_periodic *w)
		1967	{
		1968	/* TODO: use adjustheap and recalculation */
		1969	ev_periodic_stop (EV_A_ w);
		1970	ev_periodic_start (EV_A_ w);
		1971	}
		1972	#endif
		1973
		1974	#ifndef SA_RESTART
		1975	# define SA_RESTART 0
		1976	#endif
		1977
		1978	void noinline
		1979	ev_signal_start (EV_P_ ev_signal *w)
		1980	{
		1981	#if EV_MULTIPLICITY
		1982	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1983	#endif
		1984	if (expect_false (ev_is_active (w)))
		1985	return;
		1986
		1987	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1988
		1989	evpipe_init (EV_A);
		1990
		1991	{
		1992	#ifndef _WIN32
		1993	sigset_t full, prev;
		1994	sigfillset (&full);
		1995	sigprocmask (SIG_SETMASK, &full, &prev);
		1996	#endif
		1997
		1998	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1999
		2000	#ifndef _WIN32
		2001	sigprocmask (SIG_SETMASK, &prev, 0);
		2002	#endif
		2003	}
		2004
		2005	ev_start (EV_A_ (W)w, 1);
		2006	wlist_add (&signals [w->signum - 1].head, (WL)w);
		2007
		2008	if (!((WL)w)->next)
		2009	{
		2010	#if _WIN32
		2011	signal (w->signum, ev_sighandler);
		2012	#else
		2013	struct sigaction sa;
		2014	sa.sa_handler = ev_sighandler;
		2015	sigfillset (&sa.sa_mask);
		2016	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		2017	sigaction (w->signum, &sa, 0);
		2018	#endif
		2019	}
		2020	}
		2021
		2022	void noinline
		2023	ev_signal_stop (EV_P_ ev_signal *w)
		2024	{
		2025	clear_pending (EV_A_ (W)w);
		2026	if (expect_false (!ev_is_active (w)))
		2027	return;
		2028
		2029	wlist_del (&signals [w->signum - 1].head, (WL)w);
		2030	ev_stop (EV_A_ (W)w);
		2031
		2032	if (!signals [w->signum - 1].head)
		2033	signal (w->signum, SIG_DFL);
		2034	}
		2035
		2036	void
		2037	ev_child_start (EV_P_ ev_child *w)
		2038	{
		2039	#if EV_MULTIPLICITY
		2040	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		2041	#endif
		2042	if (expect_false (ev_is_active (w)))
		2043	return;
		2044
		2045	ev_start (EV_A_ (W)w, 1);
		2046	wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		2047	}
		2048
		2049	void
		2050	ev_child_stop (EV_P_ ev_child *w)
		2051	{
		2052	clear_pending (EV_A_ (W)w);
		2053	if (expect_false (!ev_is_active (w)))
		2054	return;
		2055
		2056	wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		2057	ev_stop (EV_A_ (W)w);
		2058	}
		2059
		2060	#if EV_STAT_ENABLE
		2061
		2062	# ifdef _WIN32
		2063	# undef lstat
		2064	# define lstat(a,b) _stati64 (a,b)
		2065	# endif
		2066
		2067	#define DEF_STAT_INTERVAL 5.0074891
		2068	#define MIN_STAT_INTERVAL 0.1074891
		2069
		2070	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		2071
		2072	#if EV_USE_INOTIFY
		2073	# define EV_INOTIFY_BUFSIZE 8192
		2074
		2075	static void noinline
		2076	infy_add (EV_P_ ev_stat *w)
		2077	{
		2078	w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
		2079
		2080	if (w->wd < 0)
		2081	{
		2082	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		2083
		2084	/* monitor some parent directory for speedup hints */
		2085	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		2086	{
		2087	char path [4096];
		2088	strcpy (path, w->path);
		2089
		2090	do
		2091	{
		2092	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		2093	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		2094
		2095	char *pend = strrchr (path, '/');
		2096
		2097	if (!pend)
		2098	break; /* whoops, no '/', complain to your admin */
		2099
		2100	*pend = 0;
		2101	w->wd = inotify_add_watch (fs_fd, path, mask);
		2102	}
		2103	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		2104	}
		2105	}
		2106	else
		2107	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		2108
		2109	if (w->wd >= 0)
		2110	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		2111	}
		2112
		2113	static void noinline
		2114	infy_del (EV_P_ ev_stat *w)
		2115	{
		2116	int slot;
		2117	int wd = w->wd;
		2118
		2119	if (wd < 0)
		2120	return;
		2121
		2122	w->wd = -2;
		2123	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		2124	wlist_del (&fs_hash [slot].head, (WL)w);
		2125
		2126	/* remove this watcher, if others are watching it, they will rearm */
		2127	inotify_rm_watch (fs_fd, wd);
		2128	}
		2129
		2130	static void noinline
		2131	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		2132	{
		2133	if (slot < 0)
		2134	/* overflow, need to check for all hahs slots */
		2135	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2136	infy_wd (EV_A_ slot, wd, ev);
		2137	else
		2138	{
		2139	WL w_;
		2140
		2141	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		2142	{
		2143	ev_stat *w = (ev_stat *)w_;
		2144	w_ = w_->next; /* lets us remove this watcher and all before it */
		2145
		2146	if (w->wd == wd || wd == -1)
		2147	{
		2148	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		2149	{
		2150	w->wd = -1;
		2151	infy_add (EV_A_ w); /* re-add, no matter what */
		2152	}
		2153
		2154	stat_timer_cb (EV_A_ &w->timer, 0);
		2155	}
		2156	}
		2157	}
		2158	}
		2159
337	static void	2160	static void
338	ev_start (struct ev_watcher *w, int active)	2161	infy_cb (EV_P_ ev_io *w, int revents)
339	{	2162	{
340	w->pending = 0;	2163	char buf [EV_INOTIFY_BUFSIZE];
341	w->active = active;	2164	struct inotify_event *ev = (struct inotify_event *)buf;
		2165	int ofs;
		2166	int len = read (fs_fd, buf, sizeof (buf));
		2167
		2168	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		2169	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		2170	}
		2171
		2172	void inline_size
		2173	infy_init (EV_P)
		2174	{
		2175	if (fs_fd != -2)
		2176	return;
		2177
		2178	fs_fd = inotify_init ();
		2179
		2180	if (fs_fd >= 0)
		2181	{
		2182	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		2183	ev_set_priority (&fs_w, EV_MAXPRI);
		2184	ev_io_start (EV_A_ &fs_w);
		2185	}
		2186	}
		2187
		2188	void inline_size
		2189	infy_fork (EV_P)
		2190	{
		2191	int slot;
		2192
		2193	if (fs_fd < 0)
		2194	return;
		2195
		2196	close (fs_fd);
		2197	fs_fd = inotify_init ();
		2198
		2199	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2200	{
		2201	WL w_ = fs_hash [slot].head;
		2202	fs_hash [slot].head = 0;
		2203
		2204	while (w_)
		2205	{
		2206	ev_stat *w = (ev_stat *)w_;
		2207	w_ = w_->next; /* lets us add this watcher */
		2208
		2209	w->wd = -1;
		2210
		2211	if (fs_fd >= 0)
		2212	infy_add (EV_A_ w); /* re-add, no matter what */
		2213	else
		2214	ev_timer_start (EV_A_ &w->timer);
		2215	}
		2216
		2217	}
		2218	}
		2219
		2220	#endif
		2221
		2222	void
		2223	ev_stat_stat (EV_P_ ev_stat *w)
		2224	{
		2225	if (lstat (w->path, &w->attr) < 0)
		2226	w->attr.st_nlink = 0;
		2227	else if (!w->attr.st_nlink)
		2228	w->attr.st_nlink = 1;
		2229	}
		2230
		2231	static void noinline
		2232	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		2233	{
		2234	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2235
		2236	/* we copy this here each the time so that */
		2237	/* prev has the old value when the callback gets invoked */
		2238	w->prev = w->attr;
		2239	ev_stat_stat (EV_A_ w);
		2240
		2241	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2242	if (
		2243	w->prev.st_dev != w->attr.st_dev
		2244	|| w->prev.st_ino != w->attr.st_ino
		2245	|| w->prev.st_mode != w->attr.st_mode
		2246	|| w->prev.st_nlink != w->attr.st_nlink
		2247	|| w->prev.st_uid != w->attr.st_uid
		2248	|| w->prev.st_gid != w->attr.st_gid
		2249	|| w->prev.st_rdev != w->attr.st_rdev
		2250	|| w->prev.st_size != w->attr.st_size
		2251	|| w->prev.st_atime != w->attr.st_atime
		2252	|| w->prev.st_mtime != w->attr.st_mtime
		2253	|| w->prev.st_ctime != w->attr.st_ctime
		2254	) {
		2255	#if EV_USE_INOTIFY
		2256	infy_del (EV_A_ w);
		2257	infy_add (EV_A_ w);
		2258	ev_stat_stat (EV_A_ w); /* avoid race... */
		2259	#endif
		2260
		2261	ev_feed_event (EV_A_ w, EV_STAT);
		2262	}
		2263	}
		2264
		2265	void
		2266	ev_stat_start (EV_P_ ev_stat *w)
		2267	{
		2268	if (expect_false (ev_is_active (w)))
		2269	return;
		2270
		2271	/* since we use memcmp, we need to clear any padding data etc. */
		2272	memset (&w->prev, 0, sizeof (ev_statdata));
		2273	memset (&w->attr, 0, sizeof (ev_statdata));
		2274
		2275	ev_stat_stat (EV_A_ w);
		2276
		2277	if (w->interval < MIN_STAT_INTERVAL)
		2278	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2279
		2280	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2281	ev_set_priority (&w->timer, ev_priority (w));
		2282
		2283	#if EV_USE_INOTIFY
		2284	infy_init (EV_A);
		2285
		2286	if (fs_fd >= 0)
		2287	infy_add (EV_A_ w);
		2288	else
		2289	#endif
		2290	ev_timer_start (EV_A_ &w->timer);
		2291
		2292	ev_start (EV_A_ (W)w, 1);
		2293	}
		2294
		2295	void
		2296	ev_stat_stop (EV_P_ ev_stat *w)
		2297	{
		2298	clear_pending (EV_A_ (W)w);
		2299	if (expect_false (!ev_is_active (w)))
		2300	return;
		2301
		2302	#if EV_USE_INOTIFY
		2303	infy_del (EV_A_ w);
		2304	#endif
		2305	ev_timer_stop (EV_A_ &w->timer);
		2306
		2307	ev_stop (EV_A_ (W)w);
		2308	}
		2309	#endif
		2310
		2311	#if EV_IDLE_ENABLE
		2312	void
		2313	ev_idle_start (EV_P_ ev_idle *w)
		2314	{
		2315	if (expect_false (ev_is_active (w)))
		2316	return;
		2317
		2318	pri_adjust (EV_A_ (W)w);
		2319
		2320	{
		2321	int active = ++idlecnt [ABSPRI (w)];
		2322
		2323	++idleall;
		2324	ev_start (EV_A_ (W)w, active);
		2325
		2326	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2327	idles [ABSPRI (w)][active - 1] = w;
		2328	}
		2329	}
		2330
		2331	void
		2332	ev_idle_stop (EV_P_ ev_idle *w)
		2333	{
		2334	clear_pending (EV_A_ (W)w);
		2335	if (expect_false (!ev_is_active (w)))
		2336	return;
		2337
		2338	{
		2339	int active = ((W)w)->active;
		2340
		2341	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2342	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2343
		2344	ev_stop (EV_A_ (W)w);
		2345	--idleall;
		2346	}
		2347	}
		2348	#endif
		2349
		2350	void
		2351	ev_prepare_start (EV_P_ ev_prepare *w)
		2352	{
		2353	if (expect_false (ev_is_active (w)))
		2354	return;
		2355
		2356	ev_start (EV_A_ (W)w, ++preparecnt);
		2357	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2358	prepares [preparecnt - 1] = w;
		2359	}
		2360
		2361	void
		2362	ev_prepare_stop (EV_P_ ev_prepare *w)
		2363	{
		2364	clear_pending (EV_A_ (W)w);
		2365	if (expect_false (!ev_is_active (w)))
		2366	return;
		2367
		2368	{
		2369	int active = ((W)w)->active;
		2370	prepares [active - 1] = prepares [--preparecnt];
		2371	((W)prepares [active - 1])->active = active;
		2372	}
		2373
		2374	ev_stop (EV_A_ (W)w);
		2375	}
		2376
		2377	void
		2378	ev_check_start (EV_P_ ev_check *w)
		2379	{
		2380	if (expect_false (ev_is_active (w)))
		2381	return;
		2382
		2383	ev_start (EV_A_ (W)w, ++checkcnt);
		2384	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2385	checks [checkcnt - 1] = w;
		2386	}
		2387
		2388	void
		2389	ev_check_stop (EV_P_ ev_check *w)
		2390	{
		2391	clear_pending (EV_A_ (W)w);
		2392	if (expect_false (!ev_is_active (w)))
		2393	return;
		2394
		2395	{
		2396	int active = ((W)w)->active;
		2397	checks [active - 1] = checks [--checkcnt];
		2398	((W)checks [active - 1])->active = active;
		2399	}
		2400
		2401	ev_stop (EV_A_ (W)w);
		2402	}
		2403
		2404	#if EV_EMBED_ENABLE
		2405	void noinline
		2406	ev_embed_sweep (EV_P_ ev_embed *w)
		2407	{
		2408	ev_loop (w->other, EVLOOP_NONBLOCK);
342	}	2409	}
343		2410
344	static void	2411	static void
345	ev_stop (struct ev_watcher *w)	2412	embed_io_cb (EV_P_ ev_io *io, int revents)
346	{	2413	{
347	if (w->pending)	2414	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
348	pendings [w->pending - 1].w = 0;
349		2415
350	w->active = 0;
351	/* nop */
352	}
353
354	void
355	evio_start (struct ev_io *w)
356	{
357	if (ev_is_active (w))	2416	if (ev_cb (w))
358	return;	2417	ev_feed_event (EV_A_ (W)w, EV_EMBED);
359
360	int fd = w->fd;
361
362	ev_start ((struct ev_watcher *)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
365
366	++fdchangecnt;
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}
370
371	void
372	evio_stop (struct ev_io *w)
373	{
374	if (!ev_is_active (w))
375	return;
376
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
378	ev_stop ((struct ev_watcher *)w);
379
380	++fdchangecnt;
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}
384
385	void
386	evtimer_start (struct ev_timer *w)
387	{
388	if (ev_is_active (w))
389	return;
390
391	if (w->is_abs)
392	{
393	/* this formula differs from the one in timer_reify becuse we do not round up */
394	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
396	}
397	else	2418	else
398	w->at += ev_now;	2419	ev_loop (w->other, EVLOOP_NONBLOCK);
399
400	ev_start ((struct ev_watcher *)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);
404	}	2420	}
405		2421
406	void	2422	static void
407	evtimer_stop (struct ev_timer *w)	2423	embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
408	{	2424	{
409	if (!ev_is_active (w))	2425	ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
410	return;
411		2426
412	if (w->active < timercnt--)	2427	{
		2428	struct ev_loop *loop = w->other;
		2429
		2430	while (fdchangecnt)
413	{	2431	{
414	timers [w->active - 1] = timers [timercnt];	2432	fd_reify (EV_A);
415	downheap (w->active - 1);	2433	ev_loop (EV_A_ EVLOOP_NONBLOCK);
416	}	2434	}
417		2435	}
418	ev_stop ((struct ev_watcher *)w);
419	}	2436	}
420		2437
421	void	2438	#if 0
422	evsignal_start (struct ev_signal *w)	2439	static void
		2440	embed_idle_cb (EV_P_ ev_idle *idle, int revents)
423	{	2441	{
		2442	ev_idle_stop (EV_A_ idle);
		2443	}
		2444	#endif
		2445
		2446	void
		2447	ev_embed_start (EV_P_ ev_embed *w)
		2448	{
424	if (ev_is_active (w))	2449	if (expect_false (ev_is_active (w)))
425	return;	2450	return;
426		2451
427	ev_start ((struct ev_watcher *)w, 1);	2452	{
428	array_needsize (signals, signalmax, w->signum, signals_init);	2453	struct ev_loop *loop = w->other;
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2454	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
430	}	2455	ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
		2456	}
431		2457
		2458	ev_set_priority (&w->io, ev_priority (w));
		2459	ev_io_start (EV_A_ &w->io);
		2460
		2461	ev_prepare_init (&w->prepare, embed_prepare_cb);
		2462	ev_set_priority (&w->prepare, EV_MINPRI);
		2463	ev_prepare_start (EV_A_ &w->prepare);
		2464
		2465	/*ev_idle_init (&w->idle, e,bed_idle_cb);*/
		2466
		2467	ev_start (EV_A_ (W)w, 1);
		2468	}
		2469
432	void	2470	void
433	evsignal_stop (struct ev_signal *w)	2471	ev_embed_stop (EV_P_ ev_embed *w)
434	{	2472	{
		2473	clear_pending (EV_A_ (W)w);
435	if (!ev_is_active (w))	2474	if (expect_false (!ev_is_active (w)))
436	return;	2475	return;
437		2476
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2477	ev_io_stop (EV_A_ &w->io);
439	ev_stop ((struct ev_watcher *)w);	2478	ev_prepare_stop (EV_A_ &w->prepare);
		2479
		2480	ev_stop (EV_A_ (W)w);
440	}	2481	}
		2482	#endif
		2483
		2484	#if EV_FORK_ENABLE
		2485	void
		2486	ev_fork_start (EV_P_ ev_fork *w)
		2487	{
		2488	if (expect_false (ev_is_active (w)))
		2489	return;
		2490
		2491	ev_start (EV_A_ (W)w, ++forkcnt);
		2492	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2493	forks [forkcnt - 1] = w;
		2494	}
		2495
		2496	void
		2497	ev_fork_stop (EV_P_ ev_fork *w)
		2498	{
		2499	clear_pending (EV_A_ (W)w);
		2500	if (expect_false (!ev_is_active (w)))
		2501	return;
		2502
		2503	{
		2504	int active = ((W)w)->active;
		2505	forks [active - 1] = forks [--forkcnt];
		2506	((W)forks [active - 1])->active = active;
		2507	}
		2508
		2509	ev_stop (EV_A_ (W)w);
		2510	}
		2511	#endif
		2512
		2513	#if EV_ASYNC_ENABLE
		2514	void
		2515	ev_async_start (EV_P_ ev_async *w)
		2516	{
		2517	if (expect_false (ev_is_active (w)))
		2518	return;
		2519
		2520	evpipe_init (EV_A);
		2521
		2522	ev_start (EV_A_ (W)w, ++asynccnt);
		2523	array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
		2524	asyncs [asynccnt - 1] = w;
		2525	}
		2526
		2527	void
		2528	ev_async_stop (EV_P_ ev_async *w)
		2529	{
		2530	clear_pending (EV_A_ (W)w);
		2531	if (expect_false (!ev_is_active (w)))
		2532	return;
		2533
		2534	{
		2535	int active = ((W)w)->active;
		2536	asyncs [active - 1] = asyncs [--asynccnt];
		2537	((W)asyncs [active - 1])->active = active;
		2538	}
		2539
		2540	ev_stop (EV_A_ (W)w);
		2541	}
		2542
		2543	void
		2544	ev_async_send (EV_P_ ev_async *w)
		2545	{
		2546	w->sent = 1;
		2547	evpipe_write (EV_A_ &gotasync);
		2548	}
		2549	#endif
441		2550
442	/*****************************************************************************/	2551	/*****************************************************************************/
443	#if 1	2552
		2553	struct ev_once
		2554	{
		2555	ev_io io;
		2556	ev_timer to;
		2557	void (*cb)(int revents, void *arg);
		2558	void *arg;
		2559	};
444		2560
445	static void	2561	static void
446	sin_cb (struct ev_io *w, int revents)	2562	once_cb (EV_P_ struct ev_once *once, int revents)
447	{	2563	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2564	void (*cb)(int revents, void *arg) = once->cb;
		2565	void *arg = once->arg;
		2566
		2567	ev_io_stop (EV_A_ &once->io);
		2568	ev_timer_stop (EV_A_ &once->to);
		2569	ev_free (once);
		2570
		2571	cb (revents, arg);
449	}	2572	}
450		2573
451	static void	2574	static void
		2575	once_cb_io (EV_P_ ev_io *w, int revents)
		2576	{
		2577	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2578	}
		2579
		2580	static void
452	ocb (struct ev_timer *w, int revents)	2581	once_cb_to (EV_P_ ev_timer *w, int revents)
453	{	2582	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2583	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
455	}	2584	}
456		2585
457	int main (void)	2586	void
		2587	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
458	{	2588	{
459	struct ev_io sin;	2589	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
460		2590
461	ev_init (0);	2591	if (expect_false (!once))
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];
468
469	int i;
470	for (i = 0; i < 1000; ++i)
471	{
472	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);
475	evtimer_start (w);
476	if (drand48 () < 0.5)
477	evtimer_stop (w);
478	}	2592	{
479		2593	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
480	ev_loop (0);
481
482	return 0;	2594	return;
483	}	2595	}
484		2596
485	#endif	2597	once->cb = cb;
		2598	once->arg = arg;
486		2599
		2600	ev_init (&once->io, once_cb_io);
		2601	if (fd >= 0)
		2602	{
		2603	ev_io_set (&once->io, fd, events);
		2604	ev_io_start (EV_A_ &once->io);
		2605	}
487		2606
		2607	ev_init (&once->to, once_cb_to);
		2608	if (timeout >= 0.)
		2609	{
		2610	ev_timer_set (&once->to, timeout, 0.);
		2611	ev_timer_start (EV_A_ &once->to);
		2612	}
		2613	}
488		2614
		2615	#if EV_MULTIPLICITY
		2616	#include "ev_wrap.h"
		2617	#endif
489		2618
		2619	#ifdef __cplusplus
		2620	}
		2621	#endif
		2622

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