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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 1.157 by root, Wed Nov 28 20:58:32 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	# ifndef EV_USE_INOTIFY
		100	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		101	# define EV_USE_INOTIFY 1
		102	# else
		103	# define EV_USE_INOTIFY 0
		104	# endif
		105	# endif
		106
		107	#endif
		108
1	#include <math.h>	109	#include <math.h>
2	#include <stdlib.h>	110	#include <stdlib.h>
		111	#include <fcntl.h>
		112	#include <stddef.h>
3		113
4	#include <stdio.h>	114	#include <stdio.h>
5		115
		116	#include <assert.h>
6	#include <errno.h>	117	#include <errno.h>
7	#include <sys/time.h>	118	#include <sys/types.h>
8	#include <time.h>	119	#include <time.h>
9		120
		121	#include <signal.h>
		122
		123	#ifdef EV_H
		124	# include EV_H
		125	#else
		126	# include "ev.h"
		127	#endif
		128
		129	#ifndef _WIN32
		130	# include <sys/time.h>
		131	# include <sys/wait.h>
		132	# include <unistd.h>
		133	#else
		134	# define WIN32_LEAN_AND_MEAN
		135	# include <windows.h>
		136	# ifndef EV_SELECT_IS_WINSOCKET
		137	# define EV_SELECT_IS_WINSOCKET 1
		138	# endif
		139	#endif
		140
		141	/**/
		142
		143	#ifndef EV_USE_MONOTONIC
		144	# define EV_USE_MONOTONIC 0
		145	#endif
		146
		147	#ifndef EV_USE_REALTIME
		148	# define EV_USE_REALTIME 0
		149	#endif
		150
		151	#ifndef EV_USE_SELECT
		152	# define EV_USE_SELECT 1
		153	#endif
		154
		155	#ifndef EV_USE_POLL
		156	# ifdef _WIN32
		157	# define EV_USE_POLL 0
		158	# else
		159	# define EV_USE_POLL 1
		160	# endif
		161	#endif
		162
		163	#ifndef EV_USE_EPOLL
		164	# define EV_USE_EPOLL 0
		165	#endif
		166
		167	#ifndef EV_USE_KQUEUE
		168	# define EV_USE_KQUEUE 0
		169	#endif
		170
		171	#ifndef EV_USE_PORT
		172	# define EV_USE_PORT 0
		173	#endif
		174
		175	#ifndef EV_USE_INOTIFY
		176	# define EV_USE_INOTIFY 0
		177	#endif
		178
		179	#ifndef EV_PID_HASHSIZE
		180	# if EV_MINIMAL
		181	# define EV_PID_HASHSIZE 1
		182	# else
		183	# define EV_PID_HASHSIZE 16
		184	# endif
		185	#endif
		186
		187	#ifndef EV_INOTIFY_HASHSIZE
		188	# if EV_MINIMAL
		189	# define EV_INOTIFY_HASHSIZE 1
		190	# else
		191	# define EV_INOTIFY_HASHSIZE 16
		192	# endif
		193	#endif
		194
		195	/**/
		196
10	#ifdef CLOCK_MONOTONIC	197	#ifndef CLOCK_MONOTONIC
		198	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	199	# define EV_USE_MONOTONIC 0
		200	#endif
		201
		202	#ifndef CLOCK_REALTIME
		203	# undef EV_USE_REALTIME
		204	# define EV_USE_REALTIME 0
		205	#endif
		206
		207	#if EV_SELECT_IS_WINSOCKET
		208	# include <winsock.h>
		209	#endif
		210
		211	#if !EV_STAT_ENABLE
		212	# define EV_USE_INOTIFY 0
		213	#endif
		214
		215	#if EV_USE_INOTIFY
		216	# include <sys/inotify.h>
		217	#endif
		218
		219	/**/
		220
		221	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		222	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		223	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
		224
		225	#if __GNUC__ >= 3
		226	# define expect(expr,value) __builtin_expect ((expr),(value))
		227	# define inline_size static inline /* inline for codesize */
		228	# if EV_MINIMAL
		229	# define noinline __attribute__ ((noinline))
		230	# define inline_speed static noinline
		231	# else
		232	# define noinline
		233	# define inline_speed static inline
12	#endif	234	# endif
		235	#else
		236	# define expect(expr,value) (expr)
		237	# define inline_speed static
		238	# define inline_size static
		239	# define noinline
		240	#endif
13		241
14	#define HAVE_EPOLL 1	242	#define expect_false(expr) expect ((expr) != 0, 0)
15	#define HAVE_REALTIME 1	243	#define expect_true(expr) expect ((expr) != 0, 1)
16	#define HAVE_SELECT 0
17		244
18	#define MAX_BLOCKTIME 60.	245	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		246	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
19		247
		248	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		249	#define EMPTY2(a,b) /* used to suppress some warnings */
		250
		251	typedef ev_watcher *W;
		252	typedef ev_watcher_list *WL;
		253	typedef ev_watcher_time *WT;
		254
		255	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		256
		257	#ifdef _WIN32
		258	# include "ev_win32.c"
		259	#endif
		260
		261	/*****************************************************************************/
		262
		263	static void (*syserr_cb)(const char *msg);
		264
		265	void
		266	ev_set_syserr_cb (void (*cb)(const char *msg))
		267	{
		268	syserr_cb = cb;
		269	}
		270
		271	static void noinline
		272	syserr (const char *msg)
		273	{
		274	if (!msg)
		275	msg = "(libev) system error";
		276
		277	if (syserr_cb)
		278	syserr_cb (msg);
		279	else
		280	{
		281	perror (msg);
		282	abort ();
		283	}
		284	}
		285
		286	static void *(*alloc)(void *ptr, long size);
		287
		288	void
		289	ev_set_allocator (void *(*cb)(void *ptr, long size))
		290	{
		291	alloc = cb;
		292	}
		293
		294	inline_speed void *
		295	ev_realloc (void *ptr, long size)
		296	{
		297	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		298
		299	if (!ptr && size)
		300	{
		301	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		302	abort ();
		303	}
		304
		305	return ptr;
		306	}
		307
		308	#define ev_malloc(size) ev_realloc (0, (size))
		309	#define ev_free(ptr) ev_realloc ((ptr), 0)
		310
		311	/*****************************************************************************/
		312
		313	typedef struct
		314	{
		315	WL head;
		316	unsigned char events;
		317	unsigned char reify;
		318	#if EV_SELECT_IS_WINSOCKET
		319	SOCKET handle;
		320	#endif
		321	} ANFD;
		322
		323	typedef struct
		324	{
		325	W w;
		326	int events;
		327	} ANPENDING;
		328
		329	#if EV_USE_INOTIFY
		330	typedef struct
		331	{
		332	WL head;
		333	} ANFS;
		334	#endif
		335
		336	#if EV_MULTIPLICITY
		337
		338	struct ev_loop
		339	{
		340	ev_tstamp ev_rt_now;
		341	#define ev_rt_now ((loop)->ev_rt_now)
		342	#define VAR(name,decl) decl;
		343	#include "ev_vars.h"
		344	#undef VAR
		345	};
20	#include "ev.h"	346	#include "ev_wrap.h"
21		347
22	struct ev_watcher {	348	static struct ev_loop default_loop_struct;
23	EV_WATCHER (ev_watcher);	349	struct ev_loop *ev_default_loop_ptr;
24	};
25		350
26	struct ev_watcher_list {	351	#else
27	EV_WATCHER_LIST (ev_watcher_list);
28	};
29		352
30	ev_tstamp ev_now;	353	ev_tstamp ev_rt_now;
31	int ev_method;	354	#define VAR(name,decl) static decl;
		355	#include "ev_vars.h"
		356	#undef VAR
32		357
33	static int have_monotonic; /* runtime */	358	static int ev_default_loop_ptr;
34		359
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	360	#endif
36	static void (*method_reify)(void);	361
37	static void (*method_poll)(ev_tstamp timeout);	362	/*****************************************************************************/
38		363
39	ev_tstamp	364	ev_tstamp
40	ev_time (void)	365	ev_time (void)
41	{	366	{
42	#if HAVE_REALTIME	367	#if EV_USE_REALTIME
43	struct timespec ts;	368	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	369	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	370	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	371	#else
47	struct timeval tv;	372	struct timeval tv;
48	gettimeofday (&tv, 0);	373	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	374	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	375	#endif
51	}	376	}
52		377
53	static ev_tstamp	378	ev_tstamp inline_size
54	get_clock (void)	379	get_clock (void)
55	{	380	{
56	#if HAVE_MONOTONIC	381	#if EV_USE_MONOTONIC
57	if (have_monotonic)	382	if (expect_true (have_monotonic))
58	{	383	{
59	struct timespec ts;	384	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	385	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	386	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	387	}
63	#endif	388	#endif
64		389
65	return ev_time ();	390	return ev_time ();
66	}	391	}
67		392
		393	#if EV_MULTIPLICITY
		394	ev_tstamp
		395	ev_now (EV_P)
		396	{
		397	return ev_rt_now;
		398	}
		399	#endif
		400
		401	#define array_roundsize(type,n) (((n) | 4) & ~3)
		402
68	#define array_needsize(base,cur,cnt,init) \	403	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	404	if (expect_false ((cnt) > cur)) \
70	{ \	405	{ \
71	int newcnt = cur ? cur << 1 : 16; \	406	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	407	do \
		408	{ \
		409	newcnt = array_roundsize (type, newcnt << 1); \
		410	} \
		411	while ((cnt) > newcnt); \
		412	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	413	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	414	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	415	cur = newcnt; \
		416	}
		417
		418	#define array_slim(type,stem) \
		419	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		420	{ \
		421	stem ## max = array_roundsize (stem ## cnt >> 1); \
		422	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		423	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		424	}
		425
		426	#define array_free(stem, idx) \
		427	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		428
		429	/*****************************************************************************/
		430
		431	void noinline
		432	ev_feed_event (EV_P_ void *w, int revents)
		433	{
		434	W w_ = (W)w;
		435
		436	if (expect_false (w_->pending))
		437	{
		438	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		439	return;
		440	}
		441
		442	w_->pending = ++pendingcnt [ABSPRI (w_)];
		443	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
		444	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		445	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		446	}
		447
		448	void inline_size
		449	queue_events (EV_P_ W *events, int eventcnt, int type)
		450	{
		451	int i;
		452
		453	for (i = 0; i < eventcnt; ++i)
		454	ev_feed_event (EV_A_ events [i], type);
		455	}
		456
		457	/*****************************************************************************/
		458
		459	void inline_size
		460	anfds_init (ANFD *base, int count)
		461	{
		462	while (count--)
		463	{
		464	base->head = 0;
		465	base->events = EV_NONE;
		466	base->reify = 0;
		467
		468	++base;
		469	}
		470	}
		471
		472	void inline_speed
		473	fd_event (EV_P_ int fd, int revents)
		474	{
		475	ANFD *anfd = anfds + fd;
		476	ev_io *w;
		477
		478	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		479	{
		480	int ev = w->events & revents;
		481
		482	if (ev)
		483	ev_feed_event (EV_A_ (W)w, ev);
		484	}
		485	}
		486
		487	void
		488	ev_feed_fd_event (EV_P_ int fd, int revents)
		489	{
		490	fd_event (EV_A_ fd, revents);
		491	}
		492
		493	void inline_size
		494	fd_reify (EV_P)
		495	{
		496	int i;
		497
		498	for (i = 0; i < fdchangecnt; ++i)
		499	{
		500	int fd = fdchanges [i];
		501	ANFD *anfd = anfds + fd;
		502	ev_io *w;
		503
		504	int events = 0;
		505
		506	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		507	events |= w->events;
		508
		509	#if EV_SELECT_IS_WINSOCKET
		510	if (events)
		511	{
		512	unsigned long argp;
		513	anfd->handle = _get_osfhandle (fd);
		514	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		515	}
		516	#endif
		517
		518	anfd->reify = 0;
		519
		520	backend_modify (EV_A_ fd, anfd->events, events);
		521	anfd->events = events;
		522	}
		523
		524	fdchangecnt = 0;
		525	}
		526
		527	void inline_size
		528	fd_change (EV_P_ int fd)
		529	{
		530	if (expect_false (anfds [fd].reify))
		531	return;
		532
		533	anfds [fd].reify = 1;
		534
		535	++fdchangecnt;
		536	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		537	fdchanges [fdchangecnt - 1] = fd;
		538	}
		539
		540	void inline_speed
		541	fd_kill (EV_P_ int fd)
		542	{
		543	ev_io *w;
		544
		545	while ((w = (ev_io *)anfds [fd].head))
		546	{
		547	ev_io_stop (EV_A_ w);
		548	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		549	}
		550	}
		551
		552	int inline_size
		553	fd_valid (int fd)
		554	{
		555	#ifdef _WIN32
		556	return _get_osfhandle (fd) != -1;
		557	#else
		558	return fcntl (fd, F_GETFD) != -1;
		559	#endif
		560	}
		561
		562	/* called on EBADF to verify fds */
		563	static void noinline
		564	fd_ebadf (EV_P)
		565	{
		566	int fd;
		567
		568	for (fd = 0; fd < anfdmax; ++fd)
		569	if (anfds [fd].events)
		570	if (!fd_valid (fd) == -1 && errno == EBADF)
		571	fd_kill (EV_A_ fd);
		572	}
		573
		574	/* called on ENOMEM in select/poll to kill some fds and retry */
		575	static void noinline
		576	fd_enomem (EV_P)
		577	{
		578	int fd;
		579
		580	for (fd = anfdmax; fd--; )
		581	if (anfds [fd].events)
		582	{
		583	fd_kill (EV_A_ fd);
		584	return;
76	}	585	}
		586	}
		587
		588	/* usually called after fork if backend needs to re-arm all fds from scratch */
		589	static void noinline
		590	fd_rearm_all (EV_P)
		591	{
		592	int fd;
		593
		594	for (fd = 0; fd < anfdmax; ++fd)
		595	if (anfds [fd].events)
		596	{
		597	anfds [fd].events = 0;
		598	fd_change (EV_A_ fd);
		599	}
		600	}
		601
		602	/*****************************************************************************/
		603
		604	void inline_speed
		605	upheap (WT *heap, int k)
		606	{
		607	WT w = heap [k];
		608
		609	while (k && heap [k >> 1]->at > w->at)
		610	{
		611	heap [k] = heap [k >> 1];
		612	((W)heap [k])->active = k + 1;
		613	k >>= 1;
		614	}
		615
		616	heap [k] = w;
		617	((W)heap [k])->active = k + 1;
		618
		619	}
		620
		621	void inline_speed
		622	downheap (WT *heap, int N, int k)
		623	{
		624	WT w = heap [k];
		625
		626	while (k < (N >> 1))
		627	{
		628	int j = k << 1;
		629
		630	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		631	++j;
		632
		633	if (w->at <= heap [j]->at)
		634	break;
		635
		636	heap [k] = heap [j];
		637	((W)heap [k])->active = k + 1;
		638	k = j;
		639	}
		640
		641	heap [k] = w;
		642	((W)heap [k])->active = k + 1;
		643	}
		644
		645	void inline_size
		646	adjustheap (WT *heap, int N, int k)
		647	{
		648	upheap (heap, k);
		649	downheap (heap, N, k);
		650	}
		651
		652	/*****************************************************************************/
77		653
78	typedef struct	654	typedef struct
79	{	655	{
80	struct ev_io *head;	656	WL head;
81	unsigned char wev, rev; /* want, received event set */	657	sig_atomic_t volatile gotsig;
82	} ANFD;	658	} ANSIG;
83		659
84	static ANFD *anfds;	660	static ANSIG *signals;
85	static int anfdmax;	661	static int signalmax;
86		662
87	static int *fdchanges;	663	static int sigpipe [2];
88	static int fdchangemax, fdchangecnt;	664	static sig_atomic_t volatile gotsig;
		665	static ev_io sigev;
		666
		667	void inline_size
		668	signals_init (ANSIG *base, int count)
		669	{
		670	while (count--)
		671	{
		672	base->head = 0;
		673	base->gotsig = 0;
		674
		675	++base;
		676	}
		677	}
89		678
90	static void	679	static void
91	anfds_init (ANFD *base, int count)	680	sighandler (int signum)
92	{	681	{
93	while (count--)	682	#if _WIN32
94	{	683	signal (signum, sighandler);
95	base->head = 0;	684	#endif
96	base->wev = base->rev = EV_NONE;	685
97	++base;	686	signals [signum - 1].gotsig = 1;
		687
		688	if (!gotsig)
98	}	689	{
		690	int old_errno = errno;
		691	gotsig = 1;
		692	write (sigpipe [1], &signum, 1);
		693	errno = old_errno;
		694	}
99	}	695	}
100		696
101	typedef struct	697	void noinline
		698	ev_feed_signal_event (EV_P_ int signum)
102	{	699	{
103	struct ev_watcher *w;	700	WL w;
104	int events;
105	} ANPENDING;
106		701
107	static ANPENDING *pendings;	702	#if EV_MULTIPLICITY
108	static int pendingmax, pendingcnt;	703	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		704	#endif
		705
		706	--signum;
		707
		708	if (signum < 0 || signum >= signalmax)
		709	return;
		710
		711	signals [signum].gotsig = 0;
		712
		713	for (w = signals [signum].head; w; w = w->next)
		714	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		715	}
109		716
110	static void	717	static void
111	event (struct ev_watcher *w, int events)	718	sigcb (EV_P_ ev_io *iow, int revents)
112	{	719	{
113	w->pending = ++pendingcnt;	720	int signum;
114	array_needsize (pendings, pendingmax, pendingcnt, );	721
115	pendings [pendingcnt - 1].w = w;	722	read (sigpipe [0], &revents, 1);
116	pendings [pendingcnt - 1].events = events;	723	gotsig = 0;
		724
		725	for (signum = signalmax; signum--; )
		726	if (signals [signum].gotsig)
		727	ev_feed_signal_event (EV_A_ signum + 1);
117	}	728	}
		729
		730	void inline_size
		731	fd_intern (int fd)
		732	{
		733	#ifdef _WIN32
		734	int arg = 1;
		735	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		736	#else
		737	fcntl (fd, F_SETFD, FD_CLOEXEC);
		738	fcntl (fd, F_SETFL, O_NONBLOCK);
		739	#endif
		740	}
		741
		742	static void noinline
		743	siginit (EV_P)
		744	{
		745	fd_intern (sigpipe [0]);
		746	fd_intern (sigpipe [1]);
		747
		748	ev_io_set (&sigev, sigpipe [0], EV_READ);
		749	ev_io_start (EV_A_ &sigev);
		750	ev_unref (EV_A); /* child watcher should not keep loop alive */
		751	}
		752
		753	/*****************************************************************************/
		754
		755	static ev_child *childs [EV_PID_HASHSIZE];
		756
		757	#ifndef _WIN32
		758
		759	static ev_signal childev;
		760
		761	void inline_speed
		762	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		763	{
		764	ev_child *w;
		765
		766	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		767	if (w->pid == pid || !w->pid)
		768	{
		769	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		770	w->rpid = pid;
		771	w->rstatus = status;
		772	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		773	}
		774	}
		775
		776	#ifndef WCONTINUED
		777	# define WCONTINUED 0
		778	#endif
118		779
119	static void	780	static void
120	fd_event (int fd, int events)	781	childcb (EV_P_ ev_signal *sw, int revents)
121	{	782	{
122	ANFD *anfd = anfds + fd;	783	int pid, status;
123	struct ev_io *w;
124		784
125	for (w = anfd->head; w; w = w->next)	785	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
126	{	786	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
127	int ev = w->events & events;	787	if (!WCONTINUED
		788	|| errno != EINVAL
		789	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		790	return;
128		791
129	if (ev)	792	/* make sure we are called again until all childs have been reaped */
130	event ((struct ev_watcher *)w, ev);	793	/* we need to do it this way so that the callback gets called before we continue */
131	}	794	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
132	}
133		795
134	static struct ev_timer **timers;	796	child_reap (EV_A_ sw, pid, pid, status);
135	static int timermax, timercnt;	797	if (EV_PID_HASHSIZE > 1)
136		798	child_reap (EV_A_ sw, 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	}	799	}
153		800
154	static void	801	#endif
155	downheap (int k)
156	{
157	struct ev_timer *w = timers [k];
158		802
159	while (k < (timercnt >> 1))	803	/*****************************************************************************/
160	{
161	int j = k << 1;
162		804
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	805	#if EV_USE_PORT
164	++j;	806	# include "ev_port.c"
165		807	#endif
166	if (w->at <= timers [j]->at)	808	#if EV_USE_KQUEUE
167	break;	809	# include "ev_kqueue.c"
168		810	#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	811	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	812	# include "ev_epoll.c"
190	#endif	813	#endif
		814	#if EV_USE_POLL
		815	# include "ev_poll.c"
		816	#endif
191	#if HAVE_SELECT	817	#if EV_USE_SELECT
192	# include "ev_select.c"	818	# include "ev_select.c"
193	#endif	819	#endif
194		820
195	int ev_init (int flags)	821	int
		822	ev_version_major (void)
196	{	823	{
		824	return EV_VERSION_MAJOR;
		825	}
		826
		827	int
		828	ev_version_minor (void)
		829	{
		830	return EV_VERSION_MINOR;
		831	}
		832
		833	/* return true if we are running with elevated privileges and should ignore env variables */
		834	int inline_size
		835	enable_secure (void)
		836	{
		837	#ifdef _WIN32
		838	return 0;
		839	#else
		840	return getuid () != geteuid ()
		841	|| getgid () != getegid ();
		842	#endif
		843	}
		844
		845	unsigned int
		846	ev_supported_backends (void)
		847	{
		848	unsigned int flags = 0;
		849
		850	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		851	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		852	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		853	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		854	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		855
		856	return flags;
		857	}
		858
		859	unsigned int
		860	ev_recommended_backends (void)
		861	{
		862	unsigned int flags = ev_supported_backends ();
		863
		864	#ifndef __NetBSD__
		865	/* kqueue is borked on everything but netbsd apparently */
		866	/* it usually doesn't work correctly on anything but sockets and pipes */
		867	flags &= ~EVBACKEND_KQUEUE;
		868	#endif
		869	#ifdef __APPLE__
		870	// flags &= ~EVBACKEND_KQUEUE; for documentation
		871	flags &= ~EVBACKEND_POLL;
		872	#endif
		873
		874	return flags;
		875	}
		876
		877	unsigned int
		878	ev_embeddable_backends (void)
		879	{
		880	return EVBACKEND_EPOLL
		881	| EVBACKEND_KQUEUE
		882	| EVBACKEND_PORT;
		883	}
		884
		885	unsigned int
		886	ev_backend (EV_P)
		887	{
		888	return backend;
		889	}
		890
		891	static void noinline
		892	loop_init (EV_P_ unsigned int flags)
		893	{
		894	if (!backend)
		895	{
197	#if HAVE_MONOTONIC	896	#if EV_USE_MONOTONIC
198	{	897	{
199	struct timespec ts;	898	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	899	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	900	have_monotonic = 1;
202	}	901	}
203	#endif	902	#endif
204		903
205	ev_now = ev_time ();	904	ev_rt_now = ev_time ();
		905	mn_now = get_clock ();
		906	now_floor = mn_now;
		907	rtmn_diff = ev_rt_now - mn_now;
206		908
		909	if (!(flags & EVFLAG_NOENV)
		910	&& !enable_secure ()
		911	&& getenv ("LIBEV_FLAGS"))
		912	flags = atoi (getenv ("LIBEV_FLAGS"));
		913
		914	if (!(flags & 0x0000ffffUL))
		915	flags |= ev_recommended_backends ();
		916
		917	backend = 0;
		918	backend_fd = -1;
		919	#if EV_USE_INOTIFY
		920	fs_fd = -2;
		921	#endif
		922
		923	#if EV_USE_PORT
		924	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		925	#endif
		926	#if EV_USE_KQUEUE
		927	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		928	#endif
207	#if HAVE_EPOLL	929	#if EV_USE_EPOLL
208	if (epoll_init (flags))	930	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
209	return ev_method;
210	#endif	931	#endif
		932	#if EV_USE_POLL
		933	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		934	#endif
211	#if HAVE_SELECT	935	#if EV_USE_SELECT
212	if (select_init (flags))	936	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
213	return ev_method;
214	#endif	937	#endif
215		938
216	ev_method = EVMETHOD_NONE;	939	ev_init (&sigev, sigcb);
217	return ev_method;	940	ev_set_priority (&sigev, EV_MAXPRI);
		941	}
218	}	942	}
219		943
220	void ev_prefork (void)	944	static void noinline
221	{	945	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	{	946	{
238	int i;	947	int i;
239		948
240	for (i = 0; i < pendingcnt; ++i)	949	#if EV_USE_INOTIFY
		950	if (fs_fd >= 0)
		951	close (fs_fd);
		952	#endif
		953
		954	if (backend_fd >= 0)
		955	close (backend_fd);
		956
		957	#if EV_USE_PORT
		958	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		959	#endif
		960	#if EV_USE_KQUEUE
		961	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		962	#endif
		963	#if EV_USE_EPOLL
		964	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		965	#endif
		966	#if EV_USE_POLL
		967	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		968	#endif
		969	#if EV_USE_SELECT
		970	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		971	#endif
		972
		973	for (i = NUMPRI; i--; )
		974	array_free (pending, [i]);
		975
		976	/* have to use the microsoft-never-gets-it-right macro */
		977	array_free (fdchange, EMPTY0);
		978	array_free (timer, EMPTY0);
		979	#if EV_PERIODIC_ENABLE
		980	array_free (periodic, EMPTY0);
		981	#endif
		982	array_free (idle, EMPTY0);
		983	array_free (prepare, EMPTY0);
		984	array_free (check, EMPTY0);
		985
		986	backend = 0;
		987	}
		988
		989	void inline_size infy_fork (EV_P);
		990
		991	void inline_size
		992	loop_fork (EV_P)
		993	{
		994	#if EV_USE_PORT
		995	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		996	#endif
		997	#if EV_USE_KQUEUE
		998	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		999	#endif
		1000	#if EV_USE_EPOLL
		1001	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1002	#endif
		1003	#if EV_USE_INOTIFY
		1004	infy_fork (EV_A);
		1005	#endif
		1006
		1007	if (ev_is_active (&sigev))
		1008	{
		1009	/* default loop */
		1010
		1011	ev_ref (EV_A);
		1012	ev_io_stop (EV_A_ &sigev);
		1013	close (sigpipe [0]);
		1014	close (sigpipe [1]);
		1015
		1016	while (pipe (sigpipe))
		1017	syserr ("(libev) error creating pipe");
		1018
		1019	siginit (EV_A);
241	{	1020	}
242	ANPENDING *p = pendings + i;
243		1021
244	if (p->w)	1022	postfork = 0;
		1023	}
		1024
		1025	#if EV_MULTIPLICITY
		1026	struct ev_loop *
		1027	ev_loop_new (unsigned int flags)
		1028	{
		1029	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1030
		1031	memset (loop, 0, sizeof (struct ev_loop));
		1032
		1033	loop_init (EV_A_ flags);
		1034
		1035	if (ev_backend (EV_A))
		1036	return loop;
		1037
		1038	return 0;
		1039	}
		1040
		1041	void
		1042	ev_loop_destroy (EV_P)
		1043	{
		1044	loop_destroy (EV_A);
		1045	ev_free (loop);
		1046	}
		1047
		1048	void
		1049	ev_loop_fork (EV_P)
		1050	{
		1051	postfork = 1;
		1052	}
		1053
		1054	#endif
		1055
		1056	#if EV_MULTIPLICITY
		1057	struct ev_loop *
		1058	ev_default_loop_init (unsigned int flags)
		1059	#else
		1060	int
		1061	ev_default_loop (unsigned int flags)
		1062	#endif
		1063	{
		1064	if (sigpipe [0] == sigpipe [1])
		1065	if (pipe (sigpipe))
		1066	return 0;
		1067
		1068	if (!ev_default_loop_ptr)
		1069	{
		1070	#if EV_MULTIPLICITY
		1071	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1072	#else
		1073	ev_default_loop_ptr = 1;
		1074	#endif
		1075
		1076	loop_init (EV_A_ flags);
		1077
		1078	if (ev_backend (EV_A))
245	{	1079	{
246	p->w->pending = 0;	1080	siginit (EV_A);
247	p->w->cb (p->w, p->events);	1081
		1082	#ifndef _WIN32
		1083	ev_signal_init (&childev, childcb, SIGCHLD);
		1084	ev_set_priority (&childev, EV_MAXPRI);
		1085	ev_signal_start (EV_A_ &childev);
		1086	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1087	#endif
248	}	1088	}
		1089	else
		1090	ev_default_loop_ptr = 0;
		1091	}
		1092
		1093	return ev_default_loop_ptr;
		1094	}
		1095
		1096	void
		1097	ev_default_destroy (void)
		1098	{
		1099	#if EV_MULTIPLICITY
		1100	struct ev_loop *loop = ev_default_loop_ptr;
		1101	#endif
		1102
		1103	#ifndef _WIN32
		1104	ev_ref (EV_A); /* child watcher */
		1105	ev_signal_stop (EV_A_ &childev);
		1106	#endif
		1107
		1108	ev_ref (EV_A); /* signal watcher */
		1109	ev_io_stop (EV_A_ &sigev);
		1110
		1111	close (sigpipe [0]); sigpipe [0] = 0;
		1112	close (sigpipe [1]); sigpipe [1] = 0;
		1113
		1114	loop_destroy (EV_A);
		1115	}
		1116
		1117	void
		1118	ev_default_fork (void)
		1119	{
		1120	#if EV_MULTIPLICITY
		1121	struct ev_loop *loop = ev_default_loop_ptr;
		1122	#endif
		1123
		1124	if (backend)
		1125	postfork = 1;
		1126	}
		1127
		1128	/*****************************************************************************/
		1129
		1130	int inline_size
		1131	any_pending (EV_P)
		1132	{
		1133	int pri;
		1134
		1135	for (pri = NUMPRI; pri--; )
		1136	if (pendingcnt [pri])
		1137	return 1;
		1138
		1139	return 0;
		1140	}
		1141
		1142	void inline_speed
		1143	call_pending (EV_P)
		1144	{
		1145	int pri;
		1146
		1147	for (pri = NUMPRI; pri--; )
		1148	while (pendingcnt [pri])
		1149	{
		1150	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1151
		1152	if (expect_true (p->w))
		1153	{
		1154	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1155
		1156	p->w->pending = 0;
		1157	EV_CB_INVOKE (p->w, p->events);
		1158	}
249	}	1159	}
250
251	pendingcnt = 0;
252	}	1160	}
253		1161
254	static void	1162	void inline_size
255	timer_reify (void)	1163	timers_reify (EV_P)
256	{	1164	{
257	while (timercnt && timers [0]->at <= ev_now)	1165	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	1166	{
259	struct ev_timer *w = timers [0];	1167	ev_timer *w = timers [0];
260		1168
		1169	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
		1170
261	/* first reschedule timer */	1171	/* first reschedule or stop timer */
262	if (w->repeat)	1172	if (w->repeat)
263	{	1173	{
264	if (w->is_abs)	1174	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;	1175
266	else
267	w->at = ev_now + w->repeat;	1176	((WT)w)->at += w->repeat;
		1177	if (((WT)w)->at < mn_now)
		1178	((WT)w)->at = mn_now;
268		1179
269	downheap (0);	1180	downheap ((WT *)timers, timercnt, 0);
270	}	1181	}
271	else	1182	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1183	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1184
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1185	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
275	}
276	}
277
278	int ev_loop_done;
279
280	int ev_loop (int flags)
281	{
282	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;
284
285	do
286	{	1186	}
		1187	}
		1188
		1189	#if EV_PERIODIC_ENABLE
		1190	void inline_size
		1191	periodics_reify (EV_P)
		1192	{
		1193	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1194	{
		1195	ev_periodic *w = periodics [0];
		1196
		1197	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1198
		1199	/* first reschedule or stop timer */
		1200	if (w->reschedule_cb)
		1201	{
		1202	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1203	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1204	downheap ((WT *)periodics, periodiccnt, 0);
		1205	}
		1206	else if (w->interval)
		1207	{
		1208	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1209	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1210	downheap ((WT *)periodics, periodiccnt, 0);
		1211	}
		1212	else
		1213	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1214
		1215	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1216	}
		1217	}
		1218
		1219	static void noinline
		1220	periodics_reschedule (EV_P)
		1221	{
		1222	int i;
		1223
		1224	/* adjust periodics after time jump */
		1225	for (i = 0; i < periodiccnt; ++i)
		1226	{
		1227	ev_periodic *w = periodics [i];
		1228
		1229	if (w->reschedule_cb)
		1230	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1231	else if (w->interval)
		1232	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1233	}
		1234
		1235	/* now rebuild the heap */
		1236	for (i = periodiccnt >> 1; i--; )
		1237	downheap ((WT *)periodics, periodiccnt, i);
		1238	}
		1239	#endif
		1240
		1241	int inline_size
		1242	time_update_monotonic (EV_P)
		1243	{
		1244	mn_now = get_clock ();
		1245
		1246	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1247	{
		1248	ev_rt_now = rtmn_diff + mn_now;
		1249	return 0;
		1250	}
		1251	else
		1252	{
		1253	now_floor = mn_now;
		1254	ev_rt_now = ev_time ();
		1255	return 1;
		1256	}
		1257	}
		1258
		1259	void inline_size
		1260	time_update (EV_P)
		1261	{
		1262	int i;
		1263
		1264	#if EV_USE_MONOTONIC
		1265	if (expect_true (have_monotonic))
		1266	{
		1267	if (time_update_monotonic (EV_A))
		1268	{
		1269	ev_tstamp odiff = rtmn_diff;
		1270
		1271	/* loop a few times, before making important decisions.
		1272	* on the choice of "4": one iteration isn't enough,
		1273	* in case we get preempted during the calls to
		1274	* ev_time and get_clock. a second call is almost guaranteed
		1275	* to succeed in that case, though. and looping a few more times
		1276	* doesn't hurt either as we only do this on time-jumps or
		1277	* in the unlikely event of having been preempted here.
		1278	*/
		1279	for (i = 4; --i; )
		1280	{
		1281	rtmn_diff = ev_rt_now - mn_now;
		1282
		1283	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1284	return; /* all is well */
		1285
		1286	ev_rt_now = ev_time ();
		1287	mn_now = get_clock ();
		1288	now_floor = mn_now;
		1289	}
		1290
		1291	# if EV_PERIODIC_ENABLE
		1292	periodics_reschedule (EV_A);
		1293	# endif
		1294	/* no timer adjustment, as the monotonic clock doesn't jump */
		1295	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1296	}
		1297	}
		1298	else
		1299	#endif
		1300	{
		1301	ev_rt_now = ev_time ();
		1302
		1303	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1304	{
		1305	#if EV_PERIODIC_ENABLE
		1306	periodics_reschedule (EV_A);
		1307	#endif
		1308
		1309	/* adjust timers. this is easy, as the offset is the same for all of them */
		1310	for (i = 0; i < timercnt; ++i)
		1311	((WT)timers [i])->at += ev_rt_now - mn_now;
		1312	}
		1313
		1314	mn_now = ev_rt_now;
		1315	}
		1316	}
		1317
		1318	void
		1319	ev_ref (EV_P)
		1320	{
		1321	++activecnt;
		1322	}
		1323
		1324	void
		1325	ev_unref (EV_P)
		1326	{
		1327	--activecnt;
		1328	}
		1329
		1330	static int loop_done;
		1331
		1332	void
		1333	ev_loop (EV_P_ int flags)
		1334	{
		1335	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1336	? EVUNLOOP_ONE
		1337	: EVUNLOOP_CANCEL;
		1338
		1339	while (activecnt)
		1340	{
		1341	#if EV_FORK_ENABLE
		1342	/* we might have forked, so queue fork handlers */
		1343	if (expect_false (postfork))
		1344	if (forkcnt)
		1345	{
		1346	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1347	call_pending (EV_A);
		1348	}
		1349	#endif
		1350
		1351	/* queue check watchers (and execute them) */
		1352	if (expect_false (preparecnt))
		1353	{
		1354	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1355	call_pending (EV_A);
		1356	}
		1357
		1358	/* we might have forked, so reify kernel state if necessary */
		1359	if (expect_false (postfork))
		1360	loop_fork (EV_A);
		1361
287	/* update fd-related kernel structures */	1362	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1363	fd_reify (EV_A);
289		1364
290	/* calculate blocking time */	1365	/* calculate blocking time */
291	ev_now = ev_time ();	1366	{
		1367	ev_tstamp block;
292		1368
293	if (flags & EVLOOP_NONBLOCK)	1369	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1370	block = 0.; /* do not block at all */
295	else if (!timercnt)	1371	else
		1372	{
		1373	/* update time to cancel out callback processing overhead */
		1374	#if EV_USE_MONOTONIC
		1375	if (expect_true (have_monotonic))
		1376	time_update_monotonic (EV_A);
		1377	else
		1378	#endif
		1379	{
		1380	ev_rt_now = ev_time ();
		1381	mn_now = ev_rt_now;
		1382	}
		1383
296	block = MAX_BLOCKTIME;	1384	block = MAX_BLOCKTIME;
297	else	1385
		1386	if (timercnt)
298	{	1387	{
299	block = timers [0]->at - ev_now + method_fudge;	1388	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
		1389	if (block > to) block = to;
		1390	}
		1391
		1392	#if EV_PERIODIC_ENABLE
		1393	if (periodiccnt)
		1394	{
		1395	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
		1396	if (block > to) block = to;
		1397	}
		1398	#endif
		1399
300	if (block < 0.) block = 0.;	1400	if (expect_false (block < 0.)) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1401	}
303		1402
304	method_poll (block);	1403	backend_poll (EV_A_ block);
		1404	}
305		1405
		1406	/* update ev_rt_now, do magic */
		1407	time_update (EV_A);
		1408
306	/* put pending timers into pendign queue and reschedule them */	1409	/* queue pending timers and reschedule them */
307	timer_reify ();	1410	timers_reify (EV_A); /* relative timers called last */
		1411	#if EV_PERIODIC_ENABLE
		1412	periodics_reify (EV_A); /* absolute timers called first */
		1413	#endif
308		1414
309	ev_now = ev_time ();	1415	/* queue idle watchers unless other events are pending */
		1416	if (idlecnt && !any_pending (EV_A))
		1417	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1418
		1419	/* queue check watchers, to be executed first */
		1420	if (expect_false (checkcnt))
		1421	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1422
310	call_pending ();	1423	call_pending (EV_A);
311	}
312	while (!ev_loop_done);
313	}
314		1424
315	static void	1425	if (expect_false (loop_done))
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1426	break;
		1427	}
		1428
		1429	if (loop_done == EVUNLOOP_ONE)
		1430	loop_done = EVUNLOOP_CANCEL;
		1431	}
		1432
		1433	void
		1434	ev_unloop (EV_P_ int how)
		1435	{
		1436	loop_done = how;
		1437	}
		1438
		1439	/*****************************************************************************/
		1440
		1441	void inline_size
		1442	wlist_add (WL *head, WL elem)
317	{	1443	{
318	elem->next = *head;	1444	elem->next = *head;
319	*head = elem;	1445	*head = elem;
320	}	1446	}
321		1447
322	static void	1448	void inline_size
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1449	wlist_del (WL *head, WL elem)
324	{	1450	{
325	while (*head)	1451	while (*head)
326	{	1452	{
327	if (*head == elem)	1453	if (*head == elem)
328	{	1454	{
…		…
332		1458
333	head = &(*head)->next;	1459	head = &(*head)->next;
334	}	1460	}
335	}	1461	}
336		1462
		1463	void inline_speed
		1464	ev_clear_pending (EV_P_ W w)
		1465	{
		1466	if (w->pending)
		1467	{
		1468	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1469	w->pending = 0;
		1470	}
		1471	}
		1472
		1473	void inline_speed
		1474	ev_start (EV_P_ W w, int active)
		1475	{
		1476	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1477	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1478
		1479	w->active = active;
		1480	ev_ref (EV_A);
		1481	}
		1482
		1483	void inline_size
		1484	ev_stop (EV_P_ W w)
		1485	{
		1486	ev_unref (EV_A);
		1487	w->active = 0;
		1488	}
		1489
		1490	/*****************************************************************************/
		1491
		1492	void
		1493	ev_io_start (EV_P_ ev_io *w)
		1494	{
		1495	int fd = w->fd;
		1496
		1497	if (expect_false (ev_is_active (w)))
		1498	return;
		1499
		1500	assert (("ev_io_start called with negative fd", fd >= 0));
		1501
		1502	ev_start (EV_A_ (W)w, 1);
		1503	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1504	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1505
		1506	fd_change (EV_A_ fd);
		1507	}
		1508
		1509	void
		1510	ev_io_stop (EV_P_ ev_io *w)
		1511	{
		1512	ev_clear_pending (EV_A_ (W)w);
		1513	if (expect_false (!ev_is_active (w)))
		1514	return;
		1515
		1516	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1517
		1518	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1519	ev_stop (EV_A_ (W)w);
		1520
		1521	fd_change (EV_A_ w->fd);
		1522	}
		1523
		1524	void
		1525	ev_timer_start (EV_P_ ev_timer *w)
		1526	{
		1527	if (expect_false (ev_is_active (w)))
		1528	return;
		1529
		1530	((WT)w)->at += mn_now;
		1531
		1532	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1533
		1534	ev_start (EV_A_ (W)w, ++timercnt);
		1535	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1536	timers [timercnt - 1] = w;
		1537	upheap ((WT *)timers, timercnt - 1);
		1538
		1539	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1540	}
		1541
		1542	void
		1543	ev_timer_stop (EV_P_ ev_timer *w)
		1544	{
		1545	ev_clear_pending (EV_A_ (W)w);
		1546	if (expect_false (!ev_is_active (w)))
		1547	return;
		1548
		1549	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1550
		1551	{
		1552	int active = ((W)w)->active;
		1553
		1554	if (expect_true (--active < --timercnt))
		1555	{
		1556	timers [active] = timers [timercnt];
		1557	adjustheap ((WT *)timers, timercnt, active);
		1558	}
		1559	}
		1560
		1561	((WT)w)->at -= mn_now;
		1562
		1563	ev_stop (EV_A_ (W)w);
		1564	}
		1565
		1566	void
		1567	ev_timer_again (EV_P_ ev_timer *w)
		1568	{
		1569	if (ev_is_active (w))
		1570	{
		1571	if (w->repeat)
		1572	{
		1573	((WT)w)->at = mn_now + w->repeat;
		1574	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1575	}
		1576	else
		1577	ev_timer_stop (EV_A_ w);
		1578	}
		1579	else if (w->repeat)
		1580	{
		1581	w->at = w->repeat;
		1582	ev_timer_start (EV_A_ w);
		1583	}
		1584	}
		1585
		1586	#if EV_PERIODIC_ENABLE
		1587	void
		1588	ev_periodic_start (EV_P_ ev_periodic *w)
		1589	{
		1590	if (expect_false (ev_is_active (w)))
		1591	return;
		1592
		1593	if (w->reschedule_cb)
		1594	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1595	else if (w->interval)
		1596	{
		1597	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1598	/* this formula differs from the one in periodic_reify because we do not always round up */
		1599	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1600	}
		1601
		1602	ev_start (EV_A_ (W)w, ++periodiccnt);
		1603	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1604	periodics [periodiccnt - 1] = w;
		1605	upheap ((WT *)periodics, periodiccnt - 1);
		1606
		1607	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1608	}
		1609
		1610	void
		1611	ev_periodic_stop (EV_P_ ev_periodic *w)
		1612	{
		1613	ev_clear_pending (EV_A_ (W)w);
		1614	if (expect_false (!ev_is_active (w)))
		1615	return;
		1616
		1617	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1618
		1619	{
		1620	int active = ((W)w)->active;
		1621
		1622	if (expect_true (--active < --periodiccnt))
		1623	{
		1624	periodics [active] = periodics [periodiccnt];
		1625	adjustheap ((WT *)periodics, periodiccnt, active);
		1626	}
		1627	}
		1628
		1629	ev_stop (EV_A_ (W)w);
		1630	}
		1631
		1632	void
		1633	ev_periodic_again (EV_P_ ev_periodic *w)
		1634	{
		1635	/* TODO: use adjustheap and recalculation */
		1636	ev_periodic_stop (EV_A_ w);
		1637	ev_periodic_start (EV_A_ w);
		1638	}
		1639	#endif
		1640
		1641	#ifndef SA_RESTART
		1642	# define SA_RESTART 0
		1643	#endif
		1644
		1645	void
		1646	ev_signal_start (EV_P_ ev_signal *w)
		1647	{
		1648	#if EV_MULTIPLICITY
		1649	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1650	#endif
		1651	if (expect_false (ev_is_active (w)))
		1652	return;
		1653
		1654	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1655
		1656	ev_start (EV_A_ (W)w, 1);
		1657	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1658	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1659
		1660	if (!((WL)w)->next)
		1661	{
		1662	#if _WIN32
		1663	signal (w->signum, sighandler);
		1664	#else
		1665	struct sigaction sa;
		1666	sa.sa_handler = sighandler;
		1667	sigfillset (&sa.sa_mask);
		1668	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1669	sigaction (w->signum, &sa, 0);
		1670	#endif
		1671	}
		1672	}
		1673
		1674	void
		1675	ev_signal_stop (EV_P_ ev_signal *w)
		1676	{
		1677	ev_clear_pending (EV_A_ (W)w);
		1678	if (expect_false (!ev_is_active (w)))
		1679	return;
		1680
		1681	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1682	ev_stop (EV_A_ (W)w);
		1683
		1684	if (!signals [w->signum - 1].head)
		1685	signal (w->signum, SIG_DFL);
		1686	}
		1687
		1688	void
		1689	ev_child_start (EV_P_ ev_child *w)
		1690	{
		1691	#if EV_MULTIPLICITY
		1692	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1693	#endif
		1694	if (expect_false (ev_is_active (w)))
		1695	return;
		1696
		1697	ev_start (EV_A_ (W)w, 1);
		1698	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1699	}
		1700
		1701	void
		1702	ev_child_stop (EV_P_ ev_child *w)
		1703	{
		1704	ev_clear_pending (EV_A_ (W)w);
		1705	if (expect_false (!ev_is_active (w)))
		1706	return;
		1707
		1708	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1709	ev_stop (EV_A_ (W)w);
		1710	}
		1711
		1712	#if EV_STAT_ENABLE
		1713
		1714	# ifdef _WIN32
		1715	# undef lstat
		1716	# define lstat(a,b) _stati64 (a,b)
		1717	# endif
		1718
		1719	#define DEF_STAT_INTERVAL 5.0074891
		1720	#define MIN_STAT_INTERVAL 0.1074891
		1721
		1722	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1723
		1724	#if EV_USE_INOTIFY
		1725	# define EV_INOTIFY_BUFSIZE 8192
		1726
		1727	static void noinline
		1728	infy_add (EV_P_ ev_stat *w)
		1729	{
		1730	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);
		1731
		1732	if (w->wd < 0)
		1733	{
		1734	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1735
		1736	/* monitor some parent directory for speedup hints */
		1737	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1738	{
		1739	char path [4096];
		1740	strcpy (path, w->path);
		1741
		1742	do
		1743	{
		1744	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1745	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1746
		1747	char *pend = strrchr (path, '/');
		1748
		1749	if (!pend)
		1750	break; /* whoops, no '/', complain to your admin */
		1751
		1752	*pend = 0;
		1753	w->wd = inotify_add_watch (fs_fd, path, mask);
		1754	}
		1755	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1756	}
		1757	}
		1758	else
		1759	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1760
		1761	if (w->wd >= 0)
		1762	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1763	}
		1764
		1765	static void noinline
		1766	infy_del (EV_P_ ev_stat *w)
		1767	{
		1768	int slot;
		1769	int wd = w->wd;
		1770
		1771	if (wd < 0)
		1772	return;
		1773
		1774	w->wd = -2;
		1775	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1776	wlist_del (&fs_hash [slot].head, (WL)w);
		1777
		1778	/* remove this watcher, if others are watching it, they will rearm */
		1779	inotify_rm_watch (fs_fd, wd);
		1780	}
		1781
		1782	static void noinline
		1783	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1784	{
		1785	if (slot < 0)
		1786	/* overflow, need to check for all hahs slots */
		1787	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1788	infy_wd (EV_A_ slot, wd, ev);
		1789	else
		1790	{
		1791	WL w_;
		1792
		1793	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1794	{
		1795	ev_stat *w = (ev_stat *)w_;
		1796	w_ = w_->next; /* lets us remove this watcher and all before it */
		1797
		1798	if (w->wd == wd || wd == -1)
		1799	{
		1800	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1801	{
		1802	w->wd = -1;
		1803	infy_add (EV_A_ w); /* re-add, no matter what */
		1804	}
		1805
		1806	stat_timer_cb (EV_A_ &w->timer, 0);
		1807	}
		1808	}
		1809	}
		1810	}
		1811
337	static void	1812	static void
338	ev_start (struct ev_watcher *w, int active)	1813	infy_cb (EV_P_ ev_io *w, int revents)
339	{	1814	{
340	w->pending = 0;	1815	char buf [EV_INOTIFY_BUFSIZE];
341	w->active = active;	1816	struct inotify_event *ev = (struct inotify_event *)buf;
		1817	int ofs;
		1818	int len = read (fs_fd, buf, sizeof (buf));
		1819
		1820	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1821	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1822	}
		1823
		1824	void inline_size
		1825	infy_init (EV_P)
		1826	{
		1827	if (fs_fd != -2)
		1828	return;
		1829
		1830	fs_fd = inotify_init ();
		1831
		1832	if (fs_fd >= 0)
		1833	{
		1834	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1835	ev_set_priority (&fs_w, EV_MAXPRI);
		1836	ev_io_start (EV_A_ &fs_w);
		1837	}
		1838	}
		1839
		1840	void inline_size
		1841	infy_fork (EV_P)
		1842	{
		1843	int slot;
		1844
		1845	if (fs_fd < 0)
		1846	return;
		1847
		1848	close (fs_fd);
		1849	fs_fd = inotify_init ();
		1850
		1851	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1852	{
		1853	WL w_ = fs_hash [slot].head;
		1854	fs_hash [slot].head = 0;
		1855
		1856	while (w_)
		1857	{
		1858	ev_stat *w = (ev_stat *)w_;
		1859	w_ = w_->next; /* lets us add this watcher */
		1860
		1861	w->wd = -1;
		1862
		1863	if (fs_fd >= 0)
		1864	infy_add (EV_A_ w); /* re-add, no matter what */
		1865	else
		1866	ev_timer_start (EV_A_ &w->timer);
		1867	}
		1868
		1869	}
		1870	}
		1871
		1872	#endif
		1873
		1874	void
		1875	ev_stat_stat (EV_P_ ev_stat *w)
		1876	{
		1877	if (lstat (w->path, &w->attr) < 0)
		1878	w->attr.st_nlink = 0;
		1879	else if (!w->attr.st_nlink)
		1880	w->attr.st_nlink = 1;
		1881	}
		1882
		1883	static void noinline
		1884	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1885	{
		1886	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1887
		1888	/* we copy this here each the time so that */
		1889	/* prev has the old value when the callback gets invoked */
		1890	w->prev = w->attr;
		1891	ev_stat_stat (EV_A_ w);
		1892
		1893	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		1894	if (
		1895	w->prev.st_dev != w->attr.st_dev
		1896	|| w->prev.st_ino != w->attr.st_ino
		1897	|| w->prev.st_mode != w->attr.st_mode
		1898	|| w->prev.st_nlink != w->attr.st_nlink
		1899	|| w->prev.st_uid != w->attr.st_uid
		1900	|| w->prev.st_gid != w->attr.st_gid
		1901	|| w->prev.st_rdev != w->attr.st_rdev
		1902	|| w->prev.st_size != w->attr.st_size
		1903	|| w->prev.st_atime != w->attr.st_atime
		1904	|| w->prev.st_mtime != w->attr.st_mtime
		1905	|| w->prev.st_ctime != w->attr.st_ctime
		1906	) {
		1907	#if EV_USE_INOTIFY
		1908	infy_del (EV_A_ w);
		1909	infy_add (EV_A_ w);
		1910	ev_stat_stat (EV_A_ w); /* avoid race... */
		1911	#endif
		1912
		1913	ev_feed_event (EV_A_ w, EV_STAT);
		1914	}
		1915	}
		1916
		1917	void
		1918	ev_stat_start (EV_P_ ev_stat *w)
		1919	{
		1920	if (expect_false (ev_is_active (w)))
		1921	return;
		1922
		1923	/* since we use memcmp, we need to clear any padding data etc. */
		1924	memset (&w->prev, 0, sizeof (ev_statdata));
		1925	memset (&w->attr, 0, sizeof (ev_statdata));
		1926
		1927	ev_stat_stat (EV_A_ w);
		1928
		1929	if (w->interval < MIN_STAT_INTERVAL)
		1930	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		1931
		1932	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		1933	ev_set_priority (&w->timer, ev_priority (w));
		1934
		1935	#if EV_USE_INOTIFY
		1936	infy_init (EV_A);
		1937
		1938	if (fs_fd >= 0)
		1939	infy_add (EV_A_ w);
		1940	else
		1941	#endif
		1942	ev_timer_start (EV_A_ &w->timer);
		1943
		1944	ev_start (EV_A_ (W)w, 1);
		1945	}
		1946
		1947	void
		1948	ev_stat_stop (EV_P_ ev_stat *w)
		1949	{
		1950	ev_clear_pending (EV_A_ (W)w);
		1951	if (expect_false (!ev_is_active (w)))
		1952	return;
		1953
		1954	#if EV_USE_INOTIFY
		1955	infy_del (EV_A_ w);
		1956	#endif
		1957	ev_timer_stop (EV_A_ &w->timer);
		1958
		1959	ev_stop (EV_A_ (W)w);
		1960	}
		1961	#endif
		1962
		1963	void
		1964	ev_idle_start (EV_P_ ev_idle *w)
		1965	{
		1966	if (expect_false (ev_is_active (w)))
		1967	return;
		1968
		1969	ev_start (EV_A_ (W)w, ++idlecnt);
		1970	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1971	idles [idlecnt - 1] = w;
		1972	}
		1973
		1974	void
		1975	ev_idle_stop (EV_P_ ev_idle *w)
		1976	{
		1977	ev_clear_pending (EV_A_ (W)w);
		1978	if (expect_false (!ev_is_active (w)))
		1979	return;
		1980
		1981	{
		1982	int active = ((W)w)->active;
		1983	idles [active - 1] = idles [--idlecnt];
		1984	((W)idles [active - 1])->active = active;
		1985	}
		1986
		1987	ev_stop (EV_A_ (W)w);
		1988	}
		1989
		1990	void
		1991	ev_prepare_start (EV_P_ ev_prepare *w)
		1992	{
		1993	if (expect_false (ev_is_active (w)))
		1994	return;
		1995
		1996	ev_start (EV_A_ (W)w, ++preparecnt);
		1997	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1998	prepares [preparecnt - 1] = w;
		1999	}
		2000
		2001	void
		2002	ev_prepare_stop (EV_P_ ev_prepare *w)
		2003	{
		2004	ev_clear_pending (EV_A_ (W)w);
		2005	if (expect_false (!ev_is_active (w)))
		2006	return;
		2007
		2008	{
		2009	int active = ((W)w)->active;
		2010	prepares [active - 1] = prepares [--preparecnt];
		2011	((W)prepares [active - 1])->active = active;
		2012	}
		2013
		2014	ev_stop (EV_A_ (W)w);
		2015	}
		2016
		2017	void
		2018	ev_check_start (EV_P_ ev_check *w)
		2019	{
		2020	if (expect_false (ev_is_active (w)))
		2021	return;
		2022
		2023	ev_start (EV_A_ (W)w, ++checkcnt);
		2024	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2025	checks [checkcnt - 1] = w;
		2026	}
		2027
		2028	void
		2029	ev_check_stop (EV_P_ ev_check *w)
		2030	{
		2031	ev_clear_pending (EV_A_ (W)w);
		2032	if (expect_false (!ev_is_active (w)))
		2033	return;
		2034
		2035	{
		2036	int active = ((W)w)->active;
		2037	checks [active - 1] = checks [--checkcnt];
		2038	((W)checks [active - 1])->active = active;
		2039	}
		2040
		2041	ev_stop (EV_A_ (W)w);
		2042	}
		2043
		2044	#if EV_EMBED_ENABLE
		2045	void noinline
		2046	ev_embed_sweep (EV_P_ ev_embed *w)
		2047	{
		2048	ev_loop (w->loop, EVLOOP_NONBLOCK);
342	}	2049	}
343		2050
344	static void	2051	static void
345	ev_stop (struct ev_watcher *w)	2052	embed_cb (EV_P_ ev_io *io, int revents)
346	{	2053	{
347	if (w->pending)	2054	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
348	pendings [w->pending - 1].w = 0;
349		2055
350	w->active = 0;
351	/* nop */
352	}
353
354	void
355	evio_start (struct ev_io *w)
356	{
357	if (ev_is_active (w))	2056	if (ev_cb (w))
358	return;	2057	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	2058	else
398	w->at += ev_now;	2059	ev_embed_sweep (loop, w);
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	}	2060	}
405		2061
406	void	2062	void
407	evtimer_stop (struct ev_timer *w)	2063	ev_embed_start (EV_P_ ev_embed *w)
408	{	2064	{
		2065	if (expect_false (ev_is_active (w)))
		2066	return;
		2067
		2068	{
		2069	struct ev_loop *loop = w->loop;
		2070	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		2071	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		2072	}
		2073
		2074	ev_set_priority (&w->io, ev_priority (w));
		2075	ev_io_start (EV_A_ &w->io);
		2076
		2077	ev_start (EV_A_ (W)w, 1);
		2078	}
		2079
		2080	void
		2081	ev_embed_stop (EV_P_ ev_embed *w)
		2082	{
		2083	ev_clear_pending (EV_A_ (W)w);
409	if (!ev_is_active (w))	2084	if (expect_false (!ev_is_active (w)))
410	return;	2085	return;
411		2086
412	if (w->active < timercnt--)	2087	ev_io_stop (EV_A_ &w->io);
413	{
414	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);
416	}
417		2088
418	ev_stop ((struct ev_watcher *)w);	2089	ev_stop (EV_A_ (W)w);
419	}	2090	}
		2091	#endif
420		2092
		2093	#if EV_FORK_ENABLE
421	void	2094	void
422	evsignal_start (struct ev_signal *w)	2095	ev_fork_start (EV_P_ ev_fork *w)
423	{	2096	{
424	if (ev_is_active (w))	2097	if (expect_false (ev_is_active (w)))
425	return;	2098	return;
426		2099
427	ev_start ((struct ev_watcher *)w, 1);	2100	ev_start (EV_A_ (W)w, ++forkcnt);
428	array_needsize (signals, signalmax, w->signum, signals_init);	2101	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2102	forks [forkcnt - 1] = w;
430	}	2103	}
431		2104
432	void	2105	void
433	evsignal_stop (struct ev_signal *w)	2106	ev_fork_stop (EV_P_ ev_fork *w)
434	{	2107	{
		2108	ev_clear_pending (EV_A_ (W)w);
435	if (!ev_is_active (w))	2109	if (expect_false (!ev_is_active (w)))
436	return;	2110	return;
437		2111
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2112	{
439	ev_stop ((struct ev_watcher *)w);	2113	int active = ((W)w)->active;
		2114	forks [active - 1] = forks [--forkcnt];
		2115	((W)forks [active - 1])->active = active;
		2116	}
		2117
		2118	ev_stop (EV_A_ (W)w);
440	}	2119	}
		2120	#endif
441		2121
442	/*****************************************************************************/	2122	/*****************************************************************************/
443	#if 1	2123
		2124	struct ev_once
		2125	{
		2126	ev_io io;
		2127	ev_timer to;
		2128	void (*cb)(int revents, void *arg);
		2129	void *arg;
		2130	};
444		2131
445	static void	2132	static void
446	sin_cb (struct ev_io *w, int revents)	2133	once_cb (EV_P_ struct ev_once *once, int revents)
447	{	2134	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2135	void (*cb)(int revents, void *arg) = once->cb;
		2136	void *arg = once->arg;
		2137
		2138	ev_io_stop (EV_A_ &once->io);
		2139	ev_timer_stop (EV_A_ &once->to);
		2140	ev_free (once);
		2141
		2142	cb (revents, arg);
449	}	2143	}
450		2144
451	static void	2145	static void
		2146	once_cb_io (EV_P_ ev_io *w, int revents)
		2147	{
		2148	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2149	}
		2150
		2151	static void
452	ocb (struct ev_timer *w, int revents)	2152	once_cb_to (EV_P_ ev_timer *w, int revents)
453	{	2153	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2154	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
455	}	2155	}
456		2156
457	int main (void)	2157	void
		2158	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
458	{	2159	{
459	struct ev_io sin;	2160	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
460		2161
461	ev_init (0);	2162	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	}	2163	{
479		2164	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
480	ev_loop (0);
481
482	return 0;	2165	return;
483	}	2166	}
484		2167
485	#endif	2168	once->cb = cb;
		2169	once->arg = arg;
486		2170
		2171	ev_init (&once->io, once_cb_io);
		2172	if (fd >= 0)
		2173	{
		2174	ev_io_set (&once->io, fd, events);
		2175	ev_io_start (EV_A_ &once->io);
		2176	}
487		2177
		2178	ev_init (&once->to, once_cb_to);
		2179	if (timeout >= 0.)
		2180	{
		2181	ev_timer_set (&once->to, timeout, 0.);
		2182	ev_timer_start (EV_A_ &once->to);
		2183	}
		2184	}
488		2185
		2186	#ifdef __cplusplus
		2187	}
		2188	#endif
489		2189

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