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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.198 by root, Sun Dec 23 04:45:51 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_NANOSLEEP
		60	# if HAVE_NANOSLEEP
		61	# define EV_USE_NANOSLEEP 1
		62	# else
		63	# define EV_USE_NANOSLEEP 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_SELECT
		68	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		69	# define EV_USE_SELECT 1
		70	# else
		71	# define EV_USE_SELECT 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_POLL
		76	# if HAVE_POLL && HAVE_POLL_H
		77	# define EV_USE_POLL 1
		78	# else
		79	# define EV_USE_POLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_EPOLL
		84	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		85	# define EV_USE_EPOLL 1
		86	# else
		87	# define EV_USE_EPOLL 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_KQUEUE
		92	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		93	# define EV_USE_KQUEUE 1
		94	# else
		95	# define EV_USE_KQUEUE 0
		96	# endif
		97	# endif
		98
		99	# ifndef EV_USE_PORT
		100	# if HAVE_PORT_H && HAVE_PORT_CREATE
		101	# define EV_USE_PORT 1
		102	# else
		103	# define EV_USE_PORT 0
		104	# endif
		105	# endif
		106
		107	# ifndef EV_USE_INOTIFY
		108	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		109	# define EV_USE_INOTIFY 1
		110	# else
		111	# define EV_USE_INOTIFY 0
		112	# endif
		113	# endif
		114
		115	#endif
		116
1	#include <math.h>	117	#include <math.h>
2	#include <stdlib.h>	118	#include <stdlib.h>
		119	#include <fcntl.h>
		120	#include <stddef.h>
3		121
4	#include <stdio.h>	122	#include <stdio.h>
5		123
6	#include <assert.h>	124	#include <assert.h>
7	#include <errno.h>	125	#include <errno.h>
8	#include <sys/time.h>	126	#include <sys/types.h>
9	#include <time.h>	127	#include <time.h>
10		128
		129	#include <signal.h>
		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
		134	# include "ev.h"
		135	#endif
		136
		137	#ifndef _WIN32
		138	# include <sys/time.h>
		139	# include <sys/wait.h>
		140	# include <unistd.h>
		141	#else
		142	# define WIN32_LEAN_AND_MEAN
		143	# include <windows.h>
		144	# ifndef EV_SELECT_IS_WINSOCKET
		145	# define EV_SELECT_IS_WINSOCKET 1
		146	# endif
		147	#endif
		148
		149	/**/
		150
		151	#ifndef EV_USE_MONOTONIC
		152	# define EV_USE_MONOTONIC 0
		153	#endif
		154
		155	#ifndef EV_USE_REALTIME
		156	# define EV_USE_REALTIME 0
		157	#endif
		158
		159	#ifndef EV_USE_NANOSLEEP
		160	# define EV_USE_NANOSLEEP 0
		161	#endif
		162
		163	#ifndef EV_USE_SELECT
		164	# define EV_USE_SELECT 1
		165	#endif
		166
		167	#ifndef EV_USE_POLL
		168	# ifdef _WIN32
		169	# define EV_USE_POLL 0
		170	# else
		171	# define EV_USE_POLL 1
		172	# endif
		173	#endif
		174
		175	#ifndef EV_USE_EPOLL
		176	# define EV_USE_EPOLL 0
		177	#endif
		178
		179	#ifndef EV_USE_KQUEUE
		180	# define EV_USE_KQUEUE 0
		181	#endif
		182
		183	#ifndef EV_USE_PORT
		184	# define EV_USE_PORT 0
		185	#endif
		186
		187	#ifndef EV_USE_INOTIFY
		188	# define EV_USE_INOTIFY 0
		189	#endif
		190
		191	#ifndef EV_PID_HASHSIZE
		192	# if EV_MINIMAL
		193	# define EV_PID_HASHSIZE 1
		194	# else
		195	# define EV_PID_HASHSIZE 16
		196	# endif
		197	#endif
		198
		199	#ifndef EV_INOTIFY_HASHSIZE
		200	# if EV_MINIMAL
		201	# define EV_INOTIFY_HASHSIZE 1
		202	# else
		203	# define EV_INOTIFY_HASHSIZE 16
		204	# endif
		205	#endif
		206
		207	/**/
		208
11	#ifdef CLOCK_MONOTONIC	209	#ifndef CLOCK_MONOTONIC
		210	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	211	# define EV_USE_MONOTONIC 0
		212	#endif
		213
		214	#ifndef CLOCK_REALTIME
		215	# undef EV_USE_REALTIME
		216	# define EV_USE_REALTIME 0
		217	#endif
		218
		219	#if !EV_STAT_ENABLE
		220	# undef EV_USE_INOTIFY
		221	# define EV_USE_INOTIFY 0
		222	#endif
		223
		224	#if !EV_USE_NANOSLEEP
		225	# ifndef _WIN32
		226	# include <sys/select.h>
13	#endif	227	# endif
		228	#endif
14		229
15	#define HAVE_EPOLL 1	230	#if EV_USE_INOTIFY
16	#define HAVE_REALTIME 1	231	# include <sys/inotify.h>
17	#define HAVE_SELECT 0	232	#endif
		233
		234	#if EV_SELECT_IS_WINSOCKET
		235	# include <winsock.h>
		236	#endif
		237
		238	/**/
		239
		240	/*
		241	* This is used to avoid floating point rounding problems.
		242	* It is added to ev_rt_now when scheduling periodics
		243	* to ensure progress, time-wise, even when rounding
		244	* errors are against us.
		245	* This value is good at least till the year 4000.
		246	* Better solutions welcome.
		247	*/
		248	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18		249
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	250	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	251	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		252	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21		253
		254	#if __GNUC__ >= 4
		255	# define expect(expr,value) __builtin_expect ((expr),(value))
		256	# define noinline __attribute__ ((noinline))
		257	#else
		258	# define expect(expr,value) (expr)
		259	# define noinline
		260	# if __STDC_VERSION__ < 199901L
		261	# define inline
		262	# endif
		263	#endif
		264
		265	#define expect_false(expr) expect ((expr) != 0, 0)
		266	#define expect_true(expr) expect ((expr) != 0, 1)
		267	#define inline_size static inline
		268
		269	#if EV_MINIMAL
		270	# define inline_speed static noinline
		271	#else
		272	# define inline_speed static inline
		273	#endif
		274
		275	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		276	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		277
		278	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		279	#define EMPTY2(a,b) /* used to suppress some warnings */
		280
		281	typedef ev_watcher *W;
		282	typedef ev_watcher_list *WL;
		283	typedef ev_watcher_time *WT;
		284
		285	#if EV_USE_MONOTONIC
		286	/* sig_atomic_t is used to avoid per-thread variables or locking but still */
		287	/* giving it a reasonably high chance of working on typical architetcures */
		288	static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		289	#endif
		290
		291	#ifdef _WIN32
		292	# include "ev_win32.c"
		293	#endif
		294
		295	/*****************************************************************************/
		296
		297	static void (*syserr_cb)(const char *msg);
		298
		299	void
		300	ev_set_syserr_cb (void (*cb)(const char *msg))
		301	{
		302	syserr_cb = cb;
		303	}
		304
		305	static void noinline
		306	syserr (const char *msg)
		307	{
		308	if (!msg)
		309	msg = "(libev) system error";
		310
		311	if (syserr_cb)
		312	syserr_cb (msg);
		313	else
		314	{
		315	perror (msg);
		316	abort ();
		317	}
		318	}
		319
		320	static void *(*alloc)(void *ptr, long size);
		321
		322	void
		323	ev_set_allocator (void *(*cb)(void *ptr, long size))
		324	{
		325	alloc = cb;
		326	}
		327
		328	inline_speed void *
		329	ev_realloc (void *ptr, long size)
		330	{
		331	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		332
		333	if (!ptr && size)
		334	{
		335	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		336	abort ();
		337	}
		338
		339	return ptr;
		340	}
		341
		342	#define ev_malloc(size) ev_realloc (0, (size))
		343	#define ev_free(ptr) ev_realloc ((ptr), 0)
		344
		345	/*****************************************************************************/
		346
		347	typedef struct
		348	{
		349	WL head;
		350	unsigned char events;
		351	unsigned char reify;
		352	#if EV_SELECT_IS_WINSOCKET
		353	SOCKET handle;
		354	#endif
		355	} ANFD;
		356
		357	typedef struct
		358	{
		359	W w;
		360	int events;
		361	} ANPENDING;
		362
		363	#if EV_USE_INOTIFY
		364	typedef struct
		365	{
		366	WL head;
		367	} ANFS;
		368	#endif
		369
		370	#if EV_MULTIPLICITY
		371
		372	struct ev_loop
		373	{
		374	ev_tstamp ev_rt_now;
		375	#define ev_rt_now ((loop)->ev_rt_now)
		376	#define VAR(name,decl) decl;
		377	#include "ev_vars.h"
		378	#undef VAR
		379	};
22	#include "ev.h"	380	#include "ev_wrap.h"
23		381
24	struct ev_watcher {	382	static struct ev_loop default_loop_struct;
25	EV_WATCHER (ev_watcher);	383	struct ev_loop *ev_default_loop_ptr;
26	};
27		384
28	struct ev_watcher_list {	385	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		386
32	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	387	ev_tstamp ev_rt_now;
34	int ev_method;	388	#define VAR(name,decl) static decl;
		389	#include "ev_vars.h"
		390	#undef VAR
35		391
36	static int have_monotonic; /* runtime */	392	static int ev_default_loop_ptr;
37		393
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	394	#endif
39	static void (*method_reify)(void);	395
40	static void (*method_poll)(ev_tstamp timeout);	396	/*****************************************************************************/
41		397
42	ev_tstamp	398	ev_tstamp
43	ev_time (void)	399	ev_time (void)
44	{	400	{
45	#if HAVE_REALTIME	401	#if EV_USE_REALTIME
46	struct timespec ts;	402	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	403	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	404	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	405	#else
50	struct timeval tv;	406	struct timeval tv;
51	gettimeofday (&tv, 0);	407	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	408	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	409	#endif
54	}	410	}
55		411
56	static ev_tstamp	412	ev_tstamp inline_size
57	get_clock (void)	413	get_clock (void)
58	{	414	{
59	#if HAVE_MONOTONIC	415	#if EV_USE_MONOTONIC
60	if (have_monotonic)	416	if (expect_true (have_monotonic))
61	{	417	{
62	struct timespec ts;	418	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	419	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	420	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	421	}
66	#endif	422	#endif
67		423
68	return ev_time ();	424	return ev_time ();
69	}	425	}
70		426
		427	#if EV_MULTIPLICITY
		428	ev_tstamp
		429	ev_now (EV_P)
		430	{
		431	return ev_rt_now;
		432	}
		433	#endif
		434
		435	void
		436	ev_sleep (ev_tstamp delay)
		437	{
		438	if (delay > 0.)
		439	{
		440	#if EV_USE_NANOSLEEP
		441	struct timespec ts;
		442
		443	ts.tv_sec = (time_t)delay;
		444	ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
		445
		446	nanosleep (&ts, 0);
		447	#elif defined(_WIN32)
		448	Sleep (delay * 1e3);
		449	#else
		450	struct timeval tv;
		451
		452	tv.tv_sec = (time_t)delay;
		453	tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
		454
		455	select (0, 0, 0, 0, &tv);
		456	#endif
		457	}
		458	}
		459
		460	/*****************************************************************************/
		461
		462	int inline_size
		463	array_nextsize (int elem, int cur, int cnt)
		464	{
		465	int ncur = cur + 1;
		466
		467	do
		468	ncur <<= 1;
		469	while (cnt > ncur);
		470
		471	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		472	if (elem * ncur > 4096)
		473	{
		474	ncur *= elem;
		475	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		476	ncur = ncur - sizeof (void *) * 4;
		477	ncur /= elem;
		478	}
		479
		480	return ncur;
		481	}
		482
		483	static noinline void *
		484	array_realloc (int elem, void *base, int *cur, int cnt)
		485	{
		486	*cur = array_nextsize (elem, *cur, cnt);
		487	return ev_realloc (base, elem * *cur);
		488	}
		489
71	#define array_needsize(base,cur,cnt,init) \	490	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	491	if (expect_false ((cnt) > (cur))) \
73	{ \	492	{ \
74	int newcnt = cur ? cur << 1 : 16; \	493	int ocur_ = (cur); \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	494	(base) = (type *)array_realloc \
76	base = realloc (base, sizeof (*base) * (newcnt)); \	495	(sizeof (type), (base), &(cur), (cnt)); \
77	init (base + cur, newcnt - cur); \	496	init ((base) + (ocur_), (cur) - ocur_); \
78	cur = newcnt; \	497	}
		498
		499	#if 0
		500	#define array_slim(type,stem) \
		501	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		502	{ \
		503	stem ## max = array_roundsize (stem ## cnt >> 1); \
		504	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		505	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		506	}
		507	#endif
		508
		509	#define array_free(stem, idx) \
		510	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		511
		512	/*****************************************************************************/
		513
		514	void noinline
		515	ev_feed_event (EV_P_ void *w, int revents)
		516	{
		517	W w_ = (W)w;
		518	int pri = ABSPRI (w_);
		519
		520	if (expect_false (w_->pending))
		521	pendings [pri][w_->pending - 1].events |= revents;
		522	else
		523	{
		524	w_->pending = ++pendingcnt [pri];
		525	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		526	pendings [pri][w_->pending - 1].w = w_;
		527	pendings [pri][w_->pending - 1].events = revents;
		528	}
		529	}
		530
		531	void inline_speed
		532	queue_events (EV_P_ W *events, int eventcnt, int type)
		533	{
		534	int i;
		535
		536	for (i = 0; i < eventcnt; ++i)
		537	ev_feed_event (EV_A_ events [i], type);
		538	}
		539
		540	/*****************************************************************************/
		541
		542	void inline_size
		543	anfds_init (ANFD *base, int count)
		544	{
		545	while (count--)
		546	{
		547	base->head = 0;
		548	base->events = EV_NONE;
		549	base->reify = 0;
		550
		551	++base;
		552	}
		553	}
		554
		555	void inline_speed
		556	fd_event (EV_P_ int fd, int revents)
		557	{
		558	ANFD *anfd = anfds + fd;
		559	ev_io *w;
		560
		561	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		562	{
		563	int ev = w->events & revents;
		564
		565	if (ev)
		566	ev_feed_event (EV_A_ (W)w, ev);
		567	}
		568	}
		569
		570	void
		571	ev_feed_fd_event (EV_P_ int fd, int revents)
		572	{
		573	if (fd >= 0 && fd < anfdmax)
		574	fd_event (EV_A_ fd, revents);
		575	}
		576
		577	void inline_size
		578	fd_reify (EV_P)
		579	{
		580	int i;
		581
		582	for (i = 0; i < fdchangecnt; ++i)
		583	{
		584	int fd = fdchanges [i];
		585	ANFD *anfd = anfds + fd;
		586	ev_io *w;
		587
		588	unsigned char events = 0;
		589
		590	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		591	events |= (unsigned char)w->events;
		592
		593	#if EV_SELECT_IS_WINSOCKET
		594	if (events)
		595	{
		596	unsigned long argp;
		597	anfd->handle = _get_osfhandle (fd);
		598	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		599	}
		600	#endif
		601
		602	{
		603	unsigned char o_events = anfd->events;
		604	unsigned char o_reify = anfd->reify;
		605
		606	anfd->reify = 0;
		607	anfd->events = events;
		608
		609	if (o_events != events || o_reify & EV_IOFDSET)
		610	backend_modify (EV_A_ fd, o_events, events);
79	}	611	}
		612	}
		613
		614	fdchangecnt = 0;
		615	}
		616
		617	void inline_size
		618	fd_change (EV_P_ int fd, int flags)
		619	{
		620	unsigned char reify = anfds [fd].reify;
		621	anfds [fd].reify |= flags;
		622
		623	if (expect_true (!reify))
		624	{
		625	++fdchangecnt;
		626	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		627	fdchanges [fdchangecnt - 1] = fd;
		628	}
		629	}
		630
		631	void inline_speed
		632	fd_kill (EV_P_ int fd)
		633	{
		634	ev_io *w;
		635
		636	while ((w = (ev_io *)anfds [fd].head))
		637	{
		638	ev_io_stop (EV_A_ w);
		639	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		640	}
		641	}
		642
		643	int inline_size
		644	fd_valid (int fd)
		645	{
		646	#ifdef _WIN32
		647	return _get_osfhandle (fd) != -1;
		648	#else
		649	return fcntl (fd, F_GETFD) != -1;
		650	#endif
		651	}
		652
		653	/* called on EBADF to verify fds */
		654	static void noinline
		655	fd_ebadf (EV_P)
		656	{
		657	int fd;
		658
		659	for (fd = 0; fd < anfdmax; ++fd)
		660	if (anfds [fd].events)
		661	if (!fd_valid (fd) == -1 && errno == EBADF)
		662	fd_kill (EV_A_ fd);
		663	}
		664
		665	/* called on ENOMEM in select/poll to kill some fds and retry */
		666	static void noinline
		667	fd_enomem (EV_P)
		668	{
		669	int fd;
		670
		671	for (fd = anfdmax; fd--; )
		672	if (anfds [fd].events)
		673	{
		674	fd_kill (EV_A_ fd);
		675	return;
		676	}
		677	}
		678
		679	/* usually called after fork if backend needs to re-arm all fds from scratch */
		680	static void noinline
		681	fd_rearm_all (EV_P)
		682	{
		683	int fd;
		684
		685	for (fd = 0; fd < anfdmax; ++fd)
		686	if (anfds [fd].events)
		687	{
		688	anfds [fd].events = 0;
		689	fd_change (EV_A_ fd, EV_IOFDSET | 1);
		690	}
		691	}
		692
		693	/*****************************************************************************/
		694
		695	void inline_speed
		696	upheap (WT *heap, int k)
		697	{
		698	WT w = heap [k];
		699
		700	while (k)
		701	{
		702	int p = (k - 1) >> 1;
		703
		704	if (heap [p]->at <= w->at)
		705	break;
		706
		707	heap [k] = heap [p];
		708	((W)heap [k])->active = k + 1;
		709	k = p;
		710	}
		711
		712	heap [k] = w;
		713	((W)heap [k])->active = k + 1;
		714	}
		715
		716	void inline_speed
		717	downheap (WT *heap, int N, int k)
		718	{
		719	WT w = heap [k];
		720
		721	for (;;)
		722	{
		723	int c = (k << 1) + 1;
		724
		725	if (c >= N)
		726	break;
		727
		728	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		729	? 1 : 0;
		730
		731	if (w->at <= heap [c]->at)
		732	break;
		733
		734	heap [k] = heap [c];
		735	((W)heap [k])->active = k + 1;
		736
		737	k = c;
		738	}
		739
		740	heap [k] = w;
		741	((W)heap [k])->active = k + 1;
		742	}
		743
		744	void inline_size
		745	adjustheap (WT *heap, int N, int k)
		746	{
		747	upheap (heap, k);
		748	downheap (heap, N, k);
		749	}
		750
		751	/*****************************************************************************/
80		752
81	typedef struct	753	typedef struct
82	{	754	{
83	struct ev_io *head;	755	WL head;
84	unsigned char wev, rev; /* want, received event set */	756	sig_atomic_t volatile gotsig;
85	} ANFD;	757	} ANSIG;
86		758
87	static ANFD *anfds;	759	static ANSIG *signals;
88	static int anfdmax;	760	static int signalmax;
89		761
90	static int *fdchanges;	762	static int sigpipe [2];
91	static int fdchangemax, fdchangecnt;	763	static sig_atomic_t volatile gotsig;
		764	static ev_io sigev;
		765
		766	void inline_size
		767	signals_init (ANSIG *base, int count)
		768	{
		769	while (count--)
		770	{
		771	base->head = 0;
		772	base->gotsig = 0;
		773
		774	++base;
		775	}
		776	}
92		777
93	static void	778	static void
94	anfds_init (ANFD *base, int count)	779	sighandler (int signum)
95	{	780	{
96	while (count--)	781	#if _WIN32
97	{	782	signal (signum, sighandler);
98	base->head = 0;	783	#endif
99	base->wev = base->rev = EV_NONE;	784
100	++base;	785	signals [signum - 1].gotsig = 1;
		786
		787	if (!gotsig)
101	}	788	{
		789	int old_errno = errno;
		790	gotsig = 1;
		791	write (sigpipe [1], &signum, 1);
		792	errno = old_errno;
		793	}
102	}	794	}
103		795
104	typedef struct	796	void noinline
		797	ev_feed_signal_event (EV_P_ int signum)
105	{	798	{
106	struct ev_watcher *w;	799	WL w;
107	int events;
108	} ANPENDING;
109		800
110	static ANPENDING *pendings;	801	#if EV_MULTIPLICITY
111	static int pendingmax, pendingcnt;	802	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		803	#endif
		804
		805	--signum;
		806
		807	if (signum < 0 || signum >= signalmax)
		808	return;
		809
		810	signals [signum].gotsig = 0;
		811
		812	for (w = signals [signum].head; w; w = w->next)
		813	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		814	}
112		815
113	static void	816	static void
114	event (struct ev_watcher *w, int events)	817	sigcb (EV_P_ ev_io *iow, int revents)
115	{	818	{
116	w->pending = ++pendingcnt;	819	int signum;
117	array_needsize (pendings, pendingmax, pendingcnt, );	820
118	pendings [pendingcnt - 1].w = w;	821	read (sigpipe [0], &revents, 1);
119	pendings [pendingcnt - 1].events = events;	822	gotsig = 0;
		823
		824	for (signum = signalmax; signum--; )
		825	if (signals [signum].gotsig)
		826	ev_feed_signal_event (EV_A_ signum + 1);
120	}	827	}
		828
		829	void inline_speed
		830	fd_intern (int fd)
		831	{
		832	#ifdef _WIN32
		833	int arg = 1;
		834	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		835	#else
		836	fcntl (fd, F_SETFD, FD_CLOEXEC);
		837	fcntl (fd, F_SETFL, O_NONBLOCK);
		838	#endif
		839	}
		840
		841	static void noinline
		842	siginit (EV_P)
		843	{
		844	fd_intern (sigpipe [0]);
		845	fd_intern (sigpipe [1]);
		846
		847	ev_io_set (&sigev, sigpipe [0], EV_READ);
		848	ev_io_start (EV_A_ &sigev);
		849	ev_unref (EV_A); /* child watcher should not keep loop alive */
		850	}
		851
		852	/*****************************************************************************/
		853
		854	static WL childs [EV_PID_HASHSIZE];
		855
		856	#ifndef _WIN32
		857
		858	static ev_signal childev;
		859
		860	void inline_speed
		861	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		862	{
		863	ev_child *w;
		864
		865	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		866	if (w->pid == pid || !w->pid)
		867	{
		868	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
		869	w->rpid = pid;
		870	w->rstatus = status;
		871	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		872	}
		873	}
		874
		875	#ifndef WCONTINUED
		876	# define WCONTINUED 0
		877	#endif
121		878
122	static void	879	static void
123	fd_event (int fd, int events)	880	childcb (EV_P_ ev_signal *sw, int revents)
124	{	881	{
125	ANFD *anfd = anfds + fd;	882	int pid, status;
126	struct ev_io *w;
127		883
128	for (w = anfd->head; w; w = w->next)	884	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
129	{	885	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
130	int ev = w->events & events;	886	if (!WCONTINUED
		887	|| errno != EINVAL
		888	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		889	return;
131		890
132	if (ev)	891	/* make sure we are called again until all childs have been reaped */
133	event ((struct ev_watcher *)w, ev);	892	/* we need to do it this way so that the callback gets called before we continue */
134	}	893	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
135	}
136		894
137	static struct ev_timer **atimers;	895	child_reap (EV_A_ sw, pid, pid, status);
138	static int atimermax, atimercnt;	896	if (EV_PID_HASHSIZE > 1)
139		897	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	898	}
159		899
160	static void	900	#endif
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		901
165	while (k < (N >> 1))	902	/*****************************************************************************/
166	{
167	int j = k << 1;
168		903
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	904	#if EV_USE_PORT
170	++j;	905	# include "ev_port.c"
171		906	#endif
172	if (w->at <= timers [j]->at)	907	#if EV_USE_KQUEUE
173	break;	908	# include "ev_kqueue.c"
174		909	#endif
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}
183
184	static struct ev_signal **signals;
185	static int signalmax;
186
187	static void
188	signals_init (struct ev_signal **base, int count)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL	910	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	911	# include "ev_epoll.c"
196	#endif	912	#endif
		913	#if EV_USE_POLL
		914	# include "ev_poll.c"
		915	#endif
197	#if HAVE_SELECT	916	#if EV_USE_SELECT
198	# include "ev_select.c"	917	# include "ev_select.c"
199	#endif	918	#endif
200		919
201	int ev_init (int flags)	920	int
		921	ev_version_major (void)
202	{	922	{
		923	return EV_VERSION_MAJOR;
		924	}
		925
		926	int
		927	ev_version_minor (void)
		928	{
		929	return EV_VERSION_MINOR;
		930	}
		931
		932	/* return true if we are running with elevated privileges and should ignore env variables */
		933	int inline_size
		934	enable_secure (void)
		935	{
		936	#ifdef _WIN32
		937	return 0;
		938	#else
		939	return getuid () != geteuid ()
		940	|| getgid () != getegid ();
		941	#endif
		942	}
		943
		944	unsigned int
		945	ev_supported_backends (void)
		946	{
		947	unsigned int flags = 0;
		948
		949	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		950	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		951	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		952	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		953	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		954
		955	return flags;
		956	}
		957
		958	unsigned int
		959	ev_recommended_backends (void)
		960	{
		961	unsigned int flags = ev_supported_backends ();
		962
		963	#ifndef __NetBSD__
		964	/* kqueue is borked on everything but netbsd apparently */
		965	/* it usually doesn't work correctly on anything but sockets and pipes */
		966	flags &= ~EVBACKEND_KQUEUE;
		967	#endif
		968	#ifdef __APPLE__
		969	// flags &= ~EVBACKEND_KQUEUE; for documentation
		970	flags &= ~EVBACKEND_POLL;
		971	#endif
		972
		973	return flags;
		974	}
		975
		976	unsigned int
		977	ev_embeddable_backends (void)
		978	{
		979	int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
		980
		981	/* epoll embeddability broken on all linux versions up to at least 2.6.23 */
		982	/* please fix it and tell me how to detect the fix */
		983	flags &= ~EVBACKEND_EPOLL;
		984
		985	return flags;
		986	}
		987
		988	unsigned int
		989	ev_backend (EV_P)
		990	{
		991	return backend;
		992	}
		993
		994	unsigned int
		995	ev_loop_count (EV_P)
		996	{
		997	return loop_count;
		998	}
		999
		1000	void
		1001	ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
		1002	{
		1003	io_blocktime = interval;
		1004	}
		1005
		1006	void
		1007	ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
		1008	{
		1009	timeout_blocktime = interval;
		1010	}
		1011
		1012	static void noinline
		1013	loop_init (EV_P_ unsigned int flags)
		1014	{
		1015	if (!backend)
		1016	{
203	#if HAVE_MONOTONIC	1017	#if EV_USE_MONOTONIC
204	{	1018	{
205	struct timespec ts;	1019	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	1020	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	1021	have_monotonic = 1;
208	}	1022	}
209	#endif	1023	#endif
210		1024
211	ev_now = ev_time ();	1025	ev_rt_now = ev_time ();
212	now = get_clock ();	1026	mn_now = get_clock ();
213	diff = ev_now - now;	1027	now_floor = mn_now;
		1028	rtmn_diff = ev_rt_now - mn_now;
214		1029
		1030	io_blocktime = 0.;
		1031	timeout_blocktime = 0.;
		1032
		1033	/* pid check not overridable via env */
		1034	#ifndef _WIN32
		1035	if (flags & EVFLAG_FORKCHECK)
		1036	curpid = getpid ();
		1037	#endif
		1038
		1039	if (!(flags & EVFLAG_NOENV)
		1040	&& !enable_secure ()
		1041	&& getenv ("LIBEV_FLAGS"))
		1042	flags = atoi (getenv ("LIBEV_FLAGS"));
		1043
		1044	if (!(flags & 0x0000ffffUL))
		1045	flags |= ev_recommended_backends ();
		1046
		1047	backend = 0;
		1048	backend_fd = -1;
		1049	#if EV_USE_INOTIFY
		1050	fs_fd = -2;
		1051	#endif
		1052
		1053	#if EV_USE_PORT
		1054	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		1055	#endif
		1056	#if EV_USE_KQUEUE
		1057	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		1058	#endif
215	#if HAVE_EPOLL	1059	#if EV_USE_EPOLL
216	if (epoll_init (flags))	1060	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
217	return ev_method;
218	#endif	1061	#endif
		1062	#if EV_USE_POLL
		1063	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		1064	#endif
219	#if HAVE_SELECT	1065	#if EV_USE_SELECT
220	if (select_init (flags))	1066	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
221	return ev_method;
222	#endif	1067	#endif
223		1068
224	ev_method = EVMETHOD_NONE;	1069	ev_init (&sigev, sigcb);
225	return ev_method;	1070	ev_set_priority (&sigev, EV_MAXPRI);
		1071	}
226	}	1072	}
227		1073
228	void ev_prefork (void)	1074	static void noinline
229	{	1075	loop_destroy (EV_P)
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	epoll_postfork_child ();
240	#endif
241	}
242
243	static void
244	call_pending ()
245	{	1076	{
246	int i;	1077	int i;
247		1078
248	for (i = 0; i < pendingcnt; ++i)	1079	#if EV_USE_INOTIFY
		1080	if (fs_fd >= 0)
		1081	close (fs_fd);
		1082	#endif
		1083
		1084	if (backend_fd >= 0)
		1085	close (backend_fd);
		1086
		1087	#if EV_USE_PORT
		1088	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1089	#endif
		1090	#if EV_USE_KQUEUE
		1091	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1092	#endif
		1093	#if EV_USE_EPOLL
		1094	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1095	#endif
		1096	#if EV_USE_POLL
		1097	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1098	#endif
		1099	#if EV_USE_SELECT
		1100	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1101	#endif
		1102
		1103	for (i = NUMPRI; i--; )
		1104	{
		1105	array_free (pending, [i]);
		1106	#if EV_IDLE_ENABLE
		1107	array_free (idle, [i]);
		1108	#endif
249	{	1109	}
250	ANPENDING *p = pendings + i;
251		1110
252	if (p->w)	1111	ev_free (anfds); anfdmax = 0;
		1112
		1113	/* have to use the microsoft-never-gets-it-right macro */
		1114	array_free (fdchange, EMPTY);
		1115	array_free (timer, EMPTY);
		1116	#if EV_PERIODIC_ENABLE
		1117	array_free (periodic, EMPTY);
		1118	#endif
		1119	#if EV_FORK_ENABLE
		1120	array_free (fork, EMPTY);
		1121	#endif
		1122	array_free (prepare, EMPTY);
		1123	array_free (check, EMPTY);
		1124
		1125	backend = 0;
		1126	}
		1127
		1128	void inline_size infy_fork (EV_P);
		1129
		1130	void inline_size
		1131	loop_fork (EV_P)
		1132	{
		1133	#if EV_USE_PORT
		1134	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1135	#endif
		1136	#if EV_USE_KQUEUE
		1137	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1138	#endif
		1139	#if EV_USE_EPOLL
		1140	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1141	#endif
		1142	#if EV_USE_INOTIFY
		1143	infy_fork (EV_A);
		1144	#endif
		1145
		1146	if (ev_is_active (&sigev))
		1147	{
		1148	/* default loop */
		1149
		1150	ev_ref (EV_A);
		1151	ev_io_stop (EV_A_ &sigev);
		1152	close (sigpipe [0]);
		1153	close (sigpipe [1]);
		1154
		1155	while (pipe (sigpipe))
		1156	syserr ("(libev) error creating pipe");
		1157
		1158	siginit (EV_A);
		1159	}
		1160
		1161	postfork = 0;
		1162	}
		1163
		1164	#if EV_MULTIPLICITY
		1165	struct ev_loop *
		1166	ev_loop_new (unsigned int flags)
		1167	{
		1168	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1169
		1170	memset (loop, 0, sizeof (struct ev_loop));
		1171
		1172	loop_init (EV_A_ flags);
		1173
		1174	if (ev_backend (EV_A))
		1175	return loop;
		1176
		1177	return 0;
		1178	}
		1179
		1180	void
		1181	ev_loop_destroy (EV_P)
		1182	{
		1183	loop_destroy (EV_A);
		1184	ev_free (loop);
		1185	}
		1186
		1187	void
		1188	ev_loop_fork (EV_P)
		1189	{
		1190	postfork = 1;
		1191	}
		1192
		1193	#endif
		1194
		1195	#if EV_MULTIPLICITY
		1196	struct ev_loop *
		1197	ev_default_loop_init (unsigned int flags)
		1198	#else
		1199	int
		1200	ev_default_loop (unsigned int flags)
		1201	#endif
		1202	{
		1203	if (sigpipe [0] == sigpipe [1])
		1204	if (pipe (sigpipe))
		1205	return 0;
		1206
		1207	if (!ev_default_loop_ptr)
		1208	{
		1209	#if EV_MULTIPLICITY
		1210	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1211	#else
		1212	ev_default_loop_ptr = 1;
		1213	#endif
		1214
		1215	loop_init (EV_A_ flags);
		1216
		1217	if (ev_backend (EV_A))
253	{	1218	{
254	p->w->pending = 0;	1219	siginit (EV_A);
255	p->w->cb (p->w, p->events);	1220
		1221	#ifndef _WIN32
		1222	ev_signal_init (&childev, childcb, SIGCHLD);
		1223	ev_set_priority (&childev, EV_MAXPRI);
		1224	ev_signal_start (EV_A_ &childev);
		1225	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1226	#endif
256	}	1227	}
		1228	else
		1229	ev_default_loop_ptr = 0;
		1230	}
		1231
		1232	return ev_default_loop_ptr;
		1233	}
		1234
		1235	void
		1236	ev_default_destroy (void)
		1237	{
		1238	#if EV_MULTIPLICITY
		1239	struct ev_loop *loop = ev_default_loop_ptr;
		1240	#endif
		1241
		1242	#ifndef _WIN32
		1243	ev_ref (EV_A); /* child watcher */
		1244	ev_signal_stop (EV_A_ &childev);
		1245	#endif
		1246
		1247	ev_ref (EV_A); /* signal watcher */
		1248	ev_io_stop (EV_A_ &sigev);
		1249
		1250	close (sigpipe [0]); sigpipe [0] = 0;
		1251	close (sigpipe [1]); sigpipe [1] = 0;
		1252
		1253	loop_destroy (EV_A);
		1254	}
		1255
		1256	void
		1257	ev_default_fork (void)
		1258	{
		1259	#if EV_MULTIPLICITY
		1260	struct ev_loop *loop = ev_default_loop_ptr;
		1261	#endif
		1262
		1263	if (backend)
		1264	postfork = 1;
		1265	}
		1266
		1267	/*****************************************************************************/
		1268
		1269	void
		1270	ev_invoke (EV_P_ void *w, int revents)
		1271	{
		1272	EV_CB_INVOKE ((W)w, revents);
		1273	}
		1274
		1275	void inline_speed
		1276	call_pending (EV_P)
		1277	{
		1278	int pri;
		1279
		1280	for (pri = NUMPRI; pri--; )
		1281	while (pendingcnt [pri])
		1282	{
		1283	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1284
		1285	if (expect_true (p->w))
		1286	{
		1287	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1288
		1289	p->w->pending = 0;
		1290	EV_CB_INVOKE (p->w, p->events);
		1291	}
257	}	1292	}
258
259	pendingcnt = 0;
260	}	1293	}
261		1294
262	static void	1295	void inline_size
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1296	timers_reify (EV_P)
264	{	1297	{
265	while (timercnt && timers [0]->at <= now)	1298	while (timercnt && ((WT)timers [0])->at <= mn_now)
266	{	1299	{
267	struct ev_timer *w = timers [0];	1300	ev_timer *w = (ev_timer *)timers [0];
		1301
		1302	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
268		1303
269	/* first reschedule or stop timer */	1304	/* first reschedule or stop timer */
270	if (w->repeat)	1305	if (w->repeat)
271	{	1306	{
272	if (w->is_abs)	1307	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1308
274	else
275	w->at = now + w->repeat;	1309	((WT)w)->at += w->repeat;
276		1310	if (((WT)w)->at < mn_now)
277	assert (w->at > now);	1311	((WT)w)->at = mn_now;
278		1312
279	downheap (timers, timercnt, 0);	1313	downheap (timers, timercnt, 0);
280	}	1314	}
281	else	1315	else
		1316	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1317
		1318	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1319	}
		1320	}
		1321
		1322	#if EV_PERIODIC_ENABLE
		1323	void inline_size
		1324	periodics_reify (EV_P)
		1325	{
		1326	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1327	{
		1328	ev_periodic *w = (ev_periodic *)periodics [0];
		1329
		1330	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1331
		1332	/* first reschedule or stop timer */
		1333	if (w->reschedule_cb)
282	{	1334	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	1335	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
284	--timercnt; /* maybe pass by reference instead? */	1336	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1337	downheap (periodics, periodiccnt, 0);
285	}	1338	}
		1339	else if (w->interval)
		1340	{
		1341	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1342	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1343	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1344	downheap (periodics, periodiccnt, 0);
		1345	}
		1346	else
		1347	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
286		1348
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	1349	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
288	}	1350	}
289	}	1351	}
290		1352
291	static void	1353	static void noinline
292	time_update ()	1354	periodics_reschedule (EV_P)
293	{	1355	{
294	int i;	1356	int i;
295	ev_now = ev_time ();
296		1357
297	if (have_monotonic)	1358	/* adjust periodics after time jump */
		1359	for (i = 0; i < periodiccnt; ++i)
		1360	{
		1361	ev_periodic *w = (ev_periodic *)periodics [i];
		1362
		1363	if (w->reschedule_cb)
		1364	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1365	else if (w->interval)
		1366	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
298	{	1367	}
299	ev_tstamp odiff = diff;
300		1368
301	/* detecting time jumps is much more difficult */	1369	/* now rebuild the heap */
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1370	for (i = periodiccnt >> 1; i--; )
		1371	downheap (periodics, periodiccnt, i);
		1372	}
		1373	#endif
		1374
		1375	#if EV_IDLE_ENABLE
		1376	void inline_size
		1377	idle_reify (EV_P)
		1378	{
		1379	if (expect_false (idleall))
		1380	{
		1381	int pri;
		1382
		1383	for (pri = NUMPRI; pri--; )
303	{	1384	{
		1385	if (pendingcnt [pri])
		1386	break;
		1387
		1388	if (idlecnt [pri])
		1389	{
		1390	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1391	break;
		1392	}
		1393	}
		1394	}
		1395	}
		1396	#endif
		1397
		1398	void inline_speed
		1399	time_update (EV_P_ ev_tstamp max_block)
		1400	{
		1401	int i;
		1402
		1403	#if EV_USE_MONOTONIC
		1404	if (expect_true (have_monotonic))
		1405	{
		1406	ev_tstamp odiff = rtmn_diff;
		1407
304	now = get_clock ();	1408	mn_now = get_clock ();
		1409
		1410	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1411	/* interpolate in the meantime */
		1412	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1413	{
		1414	ev_rt_now = rtmn_diff + mn_now;
		1415	return;
		1416	}
		1417
		1418	now_floor = mn_now;
		1419	ev_rt_now = ev_time ();
		1420
		1421	/* loop a few times, before making important decisions.
		1422	* on the choice of "4": one iteration isn't enough,
		1423	* in case we get preempted during the calls to
		1424	* ev_time and get_clock. a second call is almost guaranteed
		1425	* to succeed in that case, though. and looping a few more times
		1426	* doesn't hurt either as we only do this on time-jumps or
		1427	* in the unlikely event of having been preempted here.
		1428	*/
		1429	for (i = 4; --i; )
		1430	{
305	diff = ev_now - now;	1431	rtmn_diff = ev_rt_now - mn_now;
306		1432
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1433	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
308	return; /* all is well */	1434	return; /* all is well */
309		1435
310	ev_now = ev_time ();	1436	ev_rt_now = ev_time ();
		1437	mn_now = get_clock ();
		1438	now_floor = mn_now;
311	}	1439	}
312		1440
313	/* time jump detected, reschedule atimers */	1441	# if EV_PERIODIC_ENABLE
314	for (i = 0; i < atimercnt; ++i)	1442	periodics_reschedule (EV_A);
		1443	# endif
		1444	/* no timer adjustment, as the monotonic clock doesn't jump */
		1445	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1446	}
		1447	else
		1448	#endif
		1449	{
		1450	ev_rt_now = ev_time ();
		1451
		1452	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
315	{	1453	{
316	struct ev_timer *w = atimers [i];	1454	#if EV_PERIODIC_ENABLE
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1455	periodics_reschedule (EV_A);
		1456	#endif
		1457	/* adjust timers. this is easy, as the offset is the same for all of them */
		1458	for (i = 0; i < timercnt; ++i)
		1459	((WT)timers [i])->at += ev_rt_now - mn_now;
318	}	1460	}
319	}
320	else
321	{
322	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323	/* time jump detected, adjust rtimers */
324	for (i = 0; i < rtimercnt; ++i)
325	rtimers [i]->at += ev_now - now;
326		1461
327	now = ev_now;	1462	mn_now = ev_rt_now;
328	}	1463	}
329	}	1464	}
330		1465
331	int ev_loop_done;	1466	void
		1467	ev_ref (EV_P)
		1468	{
		1469	++activecnt;
		1470	}
332		1471
		1472	void
		1473	ev_unref (EV_P)
		1474	{
		1475	--activecnt;
		1476	}
		1477
		1478	static int loop_done;
		1479
		1480	void
333	void ev_loop (int flags)	1481	ev_loop (EV_P_ int flags)
334	{	1482	{
335	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	1483	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1484	? EVUNLOOP_ONE
		1485	: EVUNLOOP_CANCEL;
		1486
		1487	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
337		1488
338	do	1489	do
339	{	1490	{
		1491	#ifndef _WIN32
		1492	if (expect_false (curpid)) /* penalise the forking check even more */
		1493	if (expect_false (getpid () != curpid))
		1494	{
		1495	curpid = getpid ();
		1496	postfork = 1;
		1497	}
		1498	#endif
		1499
		1500	#if EV_FORK_ENABLE
		1501	/* we might have forked, so queue fork handlers */
		1502	if (expect_false (postfork))
		1503	if (forkcnt)
		1504	{
		1505	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1506	call_pending (EV_A);
		1507	}
		1508	#endif
		1509
		1510	/* queue prepare watchers (and execute them) */
		1511	if (expect_false (preparecnt))
		1512	{
		1513	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1514	call_pending (EV_A);
		1515	}
		1516
		1517	if (expect_false (!activecnt))
		1518	break;
		1519
		1520	/* we might have forked, so reify kernel state if necessary */
		1521	if (expect_false (postfork))
		1522	loop_fork (EV_A);
		1523
340	/* update fd-related kernel structures */	1524	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	1525	fd_reify (EV_A);
342		1526
343	/* calculate blocking time */	1527	/* calculate blocking time */
344	if (flags & EVLOOP_NONBLOCK)	1528	{
345	block = 0.;	1529	ev_tstamp waittime = 0.;
346	else	1530	ev_tstamp sleeptime = 0.;
		1531
		1532	if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
347	{	1533	{
		1534	/* update time to cancel out callback processing overhead */
		1535	time_update (EV_A_ 1e100);
		1536
348	block = MAX_BLOCKTIME;	1537	waittime = MAX_BLOCKTIME;
349		1538
350	if (rtimercnt)	1539	if (timercnt)
351	{	1540	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1541	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
353	if (block > to) block = to;	1542	if (waittime > to) waittime = to;
354	}	1543	}
355		1544
		1545	#if EV_PERIODIC_ENABLE
356	if (atimercnt)	1546	if (periodiccnt)
357	{	1547	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1548	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
359	if (block > to) block = to;	1549	if (waittime > to) waittime = to;
360	}	1550	}
		1551	#endif
361		1552
362	if (block < 0.) block = 0.;	1553	if (expect_false (waittime < timeout_blocktime))
		1554	waittime = timeout_blocktime;
		1555
		1556	sleeptime = waittime - backend_fudge;
		1557
		1558	if (expect_true (sleeptime > io_blocktime))
		1559	sleeptime = io_blocktime;
		1560
		1561	if (sleeptime)
		1562	{
		1563	ev_sleep (sleeptime);
		1564	waittime -= sleeptime;
		1565	}
363	}	1566	}
364		1567
365	method_poll (block);	1568	++loop_count;
		1569	backend_poll (EV_A_ waittime);
366		1570
367	/* update ev_now, do magic */	1571	/* update ev_rt_now, do magic */
368	time_update ();	1572	time_update (EV_A_ waittime + sleeptime);
		1573	}
369		1574
370	/* put pending timers into pendign queue and reschedule them */	1575	/* queue pending timers and reschedule them */
371	/* absolute timers first */	1576	timers_reify (EV_A); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	1577	#if EV_PERIODIC_ENABLE
373	/* relative timers second */	1578	periodics_reify (EV_A); /* absolute timers called first */
374	timers_reify (rtimers, rtimercnt, now);	1579	#endif
375		1580
		1581	#if EV_IDLE_ENABLE
		1582	/* queue idle watchers unless other events are pending */
		1583	idle_reify (EV_A);
		1584	#endif
		1585
		1586	/* queue check watchers, to be executed first */
		1587	if (expect_false (checkcnt))
		1588	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1589
376	call_pending ();	1590	call_pending (EV_A);
377	}
378	while (!ev_loop_done);
379	}
380		1591
381	static void	1592	}
382	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1593	while (expect_true (activecnt && !loop_done));
		1594
		1595	if (loop_done == EVUNLOOP_ONE)
		1596	loop_done = EVUNLOOP_CANCEL;
		1597	}
		1598
		1599	void
		1600	ev_unloop (EV_P_ int how)
		1601	{
		1602	loop_done = how;
		1603	}
		1604
		1605	/*****************************************************************************/
		1606
		1607	void inline_size
		1608	wlist_add (WL *head, WL elem)
383	{	1609	{
384	elem->next = *head;	1610	elem->next = *head;
385	*head = elem;	1611	*head = elem;
386	}	1612	}
387		1613
388	static void	1614	void inline_size
389	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1615	wlist_del (WL *head, WL elem)
390	{	1616	{
391	while (*head)	1617	while (*head)
392	{	1618	{
393	if (*head == elem)	1619	if (*head == elem)
394	{	1620	{
…		…
398		1624
399	head = &(*head)->next;	1625	head = &(*head)->next;
400	}	1626	}
401	}	1627	}
402		1628
		1629	void inline_speed
		1630	clear_pending (EV_P_ W w)
		1631	{
		1632	if (w->pending)
		1633	{
		1634	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1635	w->pending = 0;
		1636	}
		1637	}
		1638
		1639	int
		1640	ev_clear_pending (EV_P_ void *w)
		1641	{
		1642	W w_ = (W)w;
		1643	int pending = w_->pending;
		1644
		1645	if (expect_true (pending))
		1646	{
		1647	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1648	w_->pending = 0;
		1649	p->w = 0;
		1650	return p->events;
		1651	}
		1652	else
		1653	return 0;
		1654	}
		1655
		1656	void inline_size
		1657	pri_adjust (EV_P_ W w)
		1658	{
		1659	int pri = w->priority;
		1660	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1661	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1662	w->priority = pri;
		1663	}
		1664
		1665	void inline_speed
		1666	ev_start (EV_P_ W w, int active)
		1667	{
		1668	pri_adjust (EV_A_ w);
		1669	w->active = active;
		1670	ev_ref (EV_A);
		1671	}
		1672
		1673	void inline_size
		1674	ev_stop (EV_P_ W w)
		1675	{
		1676	ev_unref (EV_A);
		1677	w->active = 0;
		1678	}
		1679
		1680	/*****************************************************************************/
		1681
		1682	void noinline
		1683	ev_io_start (EV_P_ ev_io *w)
		1684	{
		1685	int fd = w->fd;
		1686
		1687	if (expect_false (ev_is_active (w)))
		1688	return;
		1689
		1690	assert (("ev_io_start called with negative fd", fd >= 0));
		1691
		1692	ev_start (EV_A_ (W)w, 1);
		1693	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1694	wlist_add (&anfds[fd].head, (WL)w);
		1695
		1696	fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
		1697	w->events &= ~EV_IOFDSET;
		1698	}
		1699
		1700	void noinline
		1701	ev_io_stop (EV_P_ ev_io *w)
		1702	{
		1703	clear_pending (EV_A_ (W)w);
		1704	if (expect_false (!ev_is_active (w)))
		1705	return;
		1706
		1707	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1708
		1709	wlist_del (&anfds[w->fd].head, (WL)w);
		1710	ev_stop (EV_A_ (W)w);
		1711
		1712	fd_change (EV_A_ w->fd, 1);
		1713	}
		1714
		1715	void noinline
		1716	ev_timer_start (EV_P_ ev_timer *w)
		1717	{
		1718	if (expect_false (ev_is_active (w)))
		1719	return;
		1720
		1721	((WT)w)->at += mn_now;
		1722
		1723	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1724
		1725	ev_start (EV_A_ (W)w, ++timercnt);
		1726	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1727	timers [timercnt - 1] = (WT)w;
		1728	upheap (timers, timercnt - 1);
		1729
		1730	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1731	}
		1732
		1733	void noinline
		1734	ev_timer_stop (EV_P_ ev_timer *w)
		1735	{
		1736	clear_pending (EV_A_ (W)w);
		1737	if (expect_false (!ev_is_active (w)))
		1738	return;
		1739
		1740	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1741
		1742	{
		1743	int active = ((W)w)->active;
		1744
		1745	if (expect_true (--active < --timercnt))
		1746	{
		1747	timers [active] = timers [timercnt];
		1748	adjustheap (timers, timercnt, active);
		1749	}
		1750	}
		1751
		1752	((WT)w)->at -= mn_now;
		1753
		1754	ev_stop (EV_A_ (W)w);
		1755	}
		1756
		1757	void noinline
		1758	ev_timer_again (EV_P_ ev_timer *w)
		1759	{
		1760	if (ev_is_active (w))
		1761	{
		1762	if (w->repeat)
		1763	{
		1764	((WT)w)->at = mn_now + w->repeat;
		1765	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1766	}
		1767	else
		1768	ev_timer_stop (EV_A_ w);
		1769	}
		1770	else if (w->repeat)
		1771	{
		1772	w->at = w->repeat;
		1773	ev_timer_start (EV_A_ w);
		1774	}
		1775	}
		1776
		1777	#if EV_PERIODIC_ENABLE
		1778	void noinline
		1779	ev_periodic_start (EV_P_ ev_periodic *w)
		1780	{
		1781	if (expect_false (ev_is_active (w)))
		1782	return;
		1783
		1784	if (w->reschedule_cb)
		1785	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1786	else if (w->interval)
		1787	{
		1788	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1789	/* this formula differs from the one in periodic_reify because we do not always round up */
		1790	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1791	}
		1792	else
		1793	((WT)w)->at = w->offset;
		1794
		1795	ev_start (EV_A_ (W)w, ++periodiccnt);
		1796	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
		1797	periodics [periodiccnt - 1] = (WT)w;
		1798	upheap (periodics, periodiccnt - 1);
		1799
		1800	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1801	}
		1802
		1803	void noinline
		1804	ev_periodic_stop (EV_P_ ev_periodic *w)
		1805	{
		1806	clear_pending (EV_A_ (W)w);
		1807	if (expect_false (!ev_is_active (w)))
		1808	return;
		1809
		1810	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1811
		1812	{
		1813	int active = ((W)w)->active;
		1814
		1815	if (expect_true (--active < --periodiccnt))
		1816	{
		1817	periodics [active] = periodics [periodiccnt];
		1818	adjustheap (periodics, periodiccnt, active);
		1819	}
		1820	}
		1821
		1822	ev_stop (EV_A_ (W)w);
		1823	}
		1824
		1825	void noinline
		1826	ev_periodic_again (EV_P_ ev_periodic *w)
		1827	{
		1828	/* TODO: use adjustheap and recalculation */
		1829	ev_periodic_stop (EV_A_ w);
		1830	ev_periodic_start (EV_A_ w);
		1831	}
		1832	#endif
		1833
		1834	#ifndef SA_RESTART
		1835	# define SA_RESTART 0
		1836	#endif
		1837
		1838	void noinline
		1839	ev_signal_start (EV_P_ ev_signal *w)
		1840	{
		1841	#if EV_MULTIPLICITY
		1842	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1843	#endif
		1844	if (expect_false (ev_is_active (w)))
		1845	return;
		1846
		1847	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1848
		1849	{
		1850	#ifndef _WIN32
		1851	sigset_t full, prev;
		1852	sigfillset (&full);
		1853	sigprocmask (SIG_SETMASK, &full, &prev);
		1854	#endif
		1855
		1856	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1857
		1858	#ifndef _WIN32
		1859	sigprocmask (SIG_SETMASK, &prev, 0);
		1860	#endif
		1861	}
		1862
		1863	ev_start (EV_A_ (W)w, 1);
		1864	wlist_add (&signals [w->signum - 1].head, (WL)w);
		1865
		1866	if (!((WL)w)->next)
		1867	{
		1868	#if _WIN32
		1869	signal (w->signum, sighandler);
		1870	#else
		1871	struct sigaction sa;
		1872	sa.sa_handler = sighandler;
		1873	sigfillset (&sa.sa_mask);
		1874	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1875	sigaction (w->signum, &sa, 0);
		1876	#endif
		1877	}
		1878	}
		1879
		1880	void noinline
		1881	ev_signal_stop (EV_P_ ev_signal *w)
		1882	{
		1883	clear_pending (EV_A_ (W)w);
		1884	if (expect_false (!ev_is_active (w)))
		1885	return;
		1886
		1887	wlist_del (&signals [w->signum - 1].head, (WL)w);
		1888	ev_stop (EV_A_ (W)w);
		1889
		1890	if (!signals [w->signum - 1].head)
		1891	signal (w->signum, SIG_DFL);
		1892	}
		1893
		1894	void
		1895	ev_child_start (EV_P_ ev_child *w)
		1896	{
		1897	#if EV_MULTIPLICITY
		1898	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1899	#endif
		1900	if (expect_false (ev_is_active (w)))
		1901	return;
		1902
		1903	ev_start (EV_A_ (W)w, 1);
		1904	wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1905	}
		1906
		1907	void
		1908	ev_child_stop (EV_P_ ev_child *w)
		1909	{
		1910	clear_pending (EV_A_ (W)w);
		1911	if (expect_false (!ev_is_active (w)))
		1912	return;
		1913
		1914	wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1915	ev_stop (EV_A_ (W)w);
		1916	}
		1917
		1918	#if EV_STAT_ENABLE
		1919
		1920	# ifdef _WIN32
		1921	# undef lstat
		1922	# define lstat(a,b) _stati64 (a,b)
		1923	# endif
		1924
		1925	#define DEF_STAT_INTERVAL 5.0074891
		1926	#define MIN_STAT_INTERVAL 0.1074891
		1927
		1928	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1929
		1930	#if EV_USE_INOTIFY
		1931	# define EV_INOTIFY_BUFSIZE 8192
		1932
		1933	static void noinline
		1934	infy_add (EV_P_ ev_stat *w)
		1935	{
		1936	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);
		1937
		1938	if (w->wd < 0)
		1939	{
		1940	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1941
		1942	/* monitor some parent directory for speedup hints */
		1943	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1944	{
		1945	char path [4096];
		1946	strcpy (path, w->path);
		1947
		1948	do
		1949	{
		1950	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1951	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1952
		1953	char *pend = strrchr (path, '/');
		1954
		1955	if (!pend)
		1956	break; /* whoops, no '/', complain to your admin */
		1957
		1958	*pend = 0;
		1959	w->wd = inotify_add_watch (fs_fd, path, mask);
		1960	}
		1961	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1962	}
		1963	}
		1964	else
		1965	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1966
		1967	if (w->wd >= 0)
		1968	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1969	}
		1970
		1971	static void noinline
		1972	infy_del (EV_P_ ev_stat *w)
		1973	{
		1974	int slot;
		1975	int wd = w->wd;
		1976
		1977	if (wd < 0)
		1978	return;
		1979
		1980	w->wd = -2;
		1981	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1982	wlist_del (&fs_hash [slot].head, (WL)w);
		1983
		1984	/* remove this watcher, if others are watching it, they will rearm */
		1985	inotify_rm_watch (fs_fd, wd);
		1986	}
		1987
		1988	static void noinline
		1989	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1990	{
		1991	if (slot < 0)
		1992	/* overflow, need to check for all hahs slots */
		1993	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1994	infy_wd (EV_A_ slot, wd, ev);
		1995	else
		1996	{
		1997	WL w_;
		1998
		1999	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		2000	{
		2001	ev_stat *w = (ev_stat *)w_;
		2002	w_ = w_->next; /* lets us remove this watcher and all before it */
		2003
		2004	if (w->wd == wd || wd == -1)
		2005	{
		2006	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		2007	{
		2008	w->wd = -1;
		2009	infy_add (EV_A_ w); /* re-add, no matter what */
		2010	}
		2011
		2012	stat_timer_cb (EV_A_ &w->timer, 0);
		2013	}
		2014	}
		2015	}
		2016	}
		2017
403	static void	2018	static void
404	ev_start (struct ev_watcher *w, int active)	2019	infy_cb (EV_P_ ev_io *w, int revents)
405	{	2020	{
406	w->pending = 0;	2021	char buf [EV_INOTIFY_BUFSIZE];
407	w->active = active;	2022	struct inotify_event *ev = (struct inotify_event *)buf;
		2023	int ofs;
		2024	int len = read (fs_fd, buf, sizeof (buf));
		2025
		2026	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		2027	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		2028	}
		2029
		2030	void inline_size
		2031	infy_init (EV_P)
		2032	{
		2033	if (fs_fd != -2)
		2034	return;
		2035
		2036	fs_fd = inotify_init ();
		2037
		2038	if (fs_fd >= 0)
		2039	{
		2040	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		2041	ev_set_priority (&fs_w, EV_MAXPRI);
		2042	ev_io_start (EV_A_ &fs_w);
		2043	}
		2044	}
		2045
		2046	void inline_size
		2047	infy_fork (EV_P)
		2048	{
		2049	int slot;
		2050
		2051	if (fs_fd < 0)
		2052	return;
		2053
		2054	close (fs_fd);
		2055	fs_fd = inotify_init ();
		2056
		2057	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2058	{
		2059	WL w_ = fs_hash [slot].head;
		2060	fs_hash [slot].head = 0;
		2061
		2062	while (w_)
		2063	{
		2064	ev_stat *w = (ev_stat *)w_;
		2065	w_ = w_->next; /* lets us add this watcher */
		2066
		2067	w->wd = -1;
		2068
		2069	if (fs_fd >= 0)
		2070	infy_add (EV_A_ w); /* re-add, no matter what */
		2071	else
		2072	ev_timer_start (EV_A_ &w->timer);
		2073	}
		2074
		2075	}
		2076	}
		2077
		2078	#endif
		2079
		2080	void
		2081	ev_stat_stat (EV_P_ ev_stat *w)
		2082	{
		2083	if (lstat (w->path, &w->attr) < 0)
		2084	w->attr.st_nlink = 0;
		2085	else if (!w->attr.st_nlink)
		2086	w->attr.st_nlink = 1;
		2087	}
		2088
		2089	static void noinline
		2090	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		2091	{
		2092	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2093
		2094	/* we copy this here each the time so that */
		2095	/* prev has the old value when the callback gets invoked */
		2096	w->prev = w->attr;
		2097	ev_stat_stat (EV_A_ w);
		2098
		2099	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2100	if (
		2101	w->prev.st_dev != w->attr.st_dev
		2102	|| w->prev.st_ino != w->attr.st_ino
		2103	|| w->prev.st_mode != w->attr.st_mode
		2104	|| w->prev.st_nlink != w->attr.st_nlink
		2105	|| w->prev.st_uid != w->attr.st_uid
		2106	|| w->prev.st_gid != w->attr.st_gid
		2107	|| w->prev.st_rdev != w->attr.st_rdev
		2108	|| w->prev.st_size != w->attr.st_size
		2109	|| w->prev.st_atime != w->attr.st_atime
		2110	|| w->prev.st_mtime != w->attr.st_mtime
		2111	|| w->prev.st_ctime != w->attr.st_ctime
		2112	) {
		2113	#if EV_USE_INOTIFY
		2114	infy_del (EV_A_ w);
		2115	infy_add (EV_A_ w);
		2116	ev_stat_stat (EV_A_ w); /* avoid race... */
		2117	#endif
		2118
		2119	ev_feed_event (EV_A_ w, EV_STAT);
		2120	}
		2121	}
		2122
		2123	void
		2124	ev_stat_start (EV_P_ ev_stat *w)
		2125	{
		2126	if (expect_false (ev_is_active (w)))
		2127	return;
		2128
		2129	/* since we use memcmp, we need to clear any padding data etc. */
		2130	memset (&w->prev, 0, sizeof (ev_statdata));
		2131	memset (&w->attr, 0, sizeof (ev_statdata));
		2132
		2133	ev_stat_stat (EV_A_ w);
		2134
		2135	if (w->interval < MIN_STAT_INTERVAL)
		2136	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2137
		2138	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2139	ev_set_priority (&w->timer, ev_priority (w));
		2140
		2141	#if EV_USE_INOTIFY
		2142	infy_init (EV_A);
		2143
		2144	if (fs_fd >= 0)
		2145	infy_add (EV_A_ w);
		2146	else
		2147	#endif
		2148	ev_timer_start (EV_A_ &w->timer);
		2149
		2150	ev_start (EV_A_ (W)w, 1);
		2151	}
		2152
		2153	void
		2154	ev_stat_stop (EV_P_ ev_stat *w)
		2155	{
		2156	clear_pending (EV_A_ (W)w);
		2157	if (expect_false (!ev_is_active (w)))
		2158	return;
		2159
		2160	#if EV_USE_INOTIFY
		2161	infy_del (EV_A_ w);
		2162	#endif
		2163	ev_timer_stop (EV_A_ &w->timer);
		2164
		2165	ev_stop (EV_A_ (W)w);
		2166	}
		2167	#endif
		2168
		2169	#if EV_IDLE_ENABLE
		2170	void
		2171	ev_idle_start (EV_P_ ev_idle *w)
		2172	{
		2173	if (expect_false (ev_is_active (w)))
		2174	return;
		2175
		2176	pri_adjust (EV_A_ (W)w);
		2177
		2178	{
		2179	int active = ++idlecnt [ABSPRI (w)];
		2180
		2181	++idleall;
		2182	ev_start (EV_A_ (W)w, active);
		2183
		2184	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2185	idles [ABSPRI (w)][active - 1] = w;
		2186	}
		2187	}
		2188
		2189	void
		2190	ev_idle_stop (EV_P_ ev_idle *w)
		2191	{
		2192	clear_pending (EV_A_ (W)w);
		2193	if (expect_false (!ev_is_active (w)))
		2194	return;
		2195
		2196	{
		2197	int active = ((W)w)->active;
		2198
		2199	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2200	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2201
		2202	ev_stop (EV_A_ (W)w);
		2203	--idleall;
		2204	}
		2205	}
		2206	#endif
		2207
		2208	void
		2209	ev_prepare_start (EV_P_ ev_prepare *w)
		2210	{
		2211	if (expect_false (ev_is_active (w)))
		2212	return;
		2213
		2214	ev_start (EV_A_ (W)w, ++preparecnt);
		2215	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2216	prepares [preparecnt - 1] = w;
		2217	}
		2218
		2219	void
		2220	ev_prepare_stop (EV_P_ ev_prepare *w)
		2221	{
		2222	clear_pending (EV_A_ (W)w);
		2223	if (expect_false (!ev_is_active (w)))
		2224	return;
		2225
		2226	{
		2227	int active = ((W)w)->active;
		2228	prepares [active - 1] = prepares [--preparecnt];
		2229	((W)prepares [active - 1])->active = active;
		2230	}
		2231
		2232	ev_stop (EV_A_ (W)w);
		2233	}
		2234
		2235	void
		2236	ev_check_start (EV_P_ ev_check *w)
		2237	{
		2238	if (expect_false (ev_is_active (w)))
		2239	return;
		2240
		2241	ev_start (EV_A_ (W)w, ++checkcnt);
		2242	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2243	checks [checkcnt - 1] = w;
		2244	}
		2245
		2246	void
		2247	ev_check_stop (EV_P_ ev_check *w)
		2248	{
		2249	clear_pending (EV_A_ (W)w);
		2250	if (expect_false (!ev_is_active (w)))
		2251	return;
		2252
		2253	{
		2254	int active = ((W)w)->active;
		2255	checks [active - 1] = checks [--checkcnt];
		2256	((W)checks [active - 1])->active = active;
		2257	}
		2258
		2259	ev_stop (EV_A_ (W)w);
		2260	}
		2261
		2262	#if EV_EMBED_ENABLE
		2263	void noinline
		2264	ev_embed_sweep (EV_P_ ev_embed *w)
		2265	{
		2266	ev_loop (w->other, EVLOOP_NONBLOCK);
408	}	2267	}
409		2268
410	static void	2269	static void
411	ev_stop (struct ev_watcher *w)	2270	embed_io_cb (EV_P_ ev_io *io, int revents)
412	{	2271	{
413	if (w->pending)	2272	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
414	pendings [w->pending - 1].w = 0;
415		2273
416	w->active = 0;
417	/* nop */
418	}
419
420	void
421	evio_start (struct ev_io *w)
422	{
423	if (ev_is_active (w))	2274	if (ev_cb (w))
424	return;	2275	ev_feed_event (EV_A_ (W)w, EV_EMBED);
425
426	int fd = w->fd;
427
428	ev_start ((struct ev_watcher *)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
431
432	++fdchangecnt;
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}
436
437	void
438	evio_stop (struct ev_io *w)
439	{
440	if (!ev_is_active (w))
441	return;
442
443	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
444	ev_stop ((struct ev_watcher *)w);
445
446	++fdchangecnt;
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}
450
451	void
452	evtimer_start (struct ev_timer *w)
453	{
454	if (ev_is_active (w))
455	return;
456
457	if (w->is_abs)
458	{
459	/* this formula differs from the one in timer_reify becuse we do not round up */
460	if (w->repeat)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
462
463	ev_start ((struct ev_watcher *)w, ++atimercnt);
464	array_needsize (atimers, atimermax, atimercnt, );
465	atimers [atimercnt - 1] = w;
466	upheap (atimers, atimercnt - 1);
467	}
468	else	2276	else
		2277	ev_loop (w->other, EVLOOP_NONBLOCK);
		2278	}
		2279
		2280	static void
		2281	embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
		2282	{
		2283	ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
		2284
469	{	2285	{
470	w->at += now;	2286	struct ev_loop *loop = w->other;
471		2287
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	2288	while (fdchangecnt)
473	array_needsize (rtimers, rtimermax, rtimercnt, );
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{	2289	{
490	atimers [w->active - 1] = atimers [atimercnt];	2290	fd_reify (EV_A);
491	downheap (atimers, atimercnt, w->active - 1);	2291	ev_loop (EV_A_ EVLOOP_NONBLOCK);
492	}	2292	}
493	}	2293	}
494	else
495	{
496	if (w->active < rtimercnt--)
497	{
498	rtimers [w->active - 1] = rtimers [rtimercnt];
499	downheap (rtimers, rtimercnt, w->active - 1);
500	}
501	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	2294	}
505		2295
506	void	2296	#if 0
507	evsignal_start (struct ev_signal *w)	2297	static void
		2298	embed_idle_cb (EV_P_ ev_idle *idle, int revents)
508	{	2299	{
		2300	ev_idle_stop (EV_A_ idle);
		2301	}
		2302	#endif
		2303
		2304	void
		2305	ev_embed_start (EV_P_ ev_embed *w)
		2306	{
509	if (ev_is_active (w))	2307	if (expect_false (ev_is_active (w)))
510	return;	2308	return;
511		2309
512	ev_start ((struct ev_watcher *)w, 1);	2310	{
513	array_needsize (signals, signalmax, w->signum, signals_init);	2311	struct ev_loop *loop = w->other;
514	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2312	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
515	}	2313	ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
		2314	}
516		2315
		2316	ev_set_priority (&w->io, ev_priority (w));
		2317	ev_io_start (EV_A_ &w->io);
		2318
		2319	ev_prepare_init (&w->prepare, embed_prepare_cb);
		2320	ev_set_priority (&w->prepare, EV_MINPRI);
		2321	ev_prepare_start (EV_A_ &w->prepare);
		2322
		2323	/*ev_idle_init (&w->idle, e,bed_idle_cb);*/
		2324
		2325	ev_start (EV_A_ (W)w, 1);
		2326	}
		2327
517	void	2328	void
518	evsignal_stop (struct ev_signal *w)	2329	ev_embed_stop (EV_P_ ev_embed *w)
519	{	2330	{
		2331	clear_pending (EV_A_ (W)w);
520	if (!ev_is_active (w))	2332	if (expect_false (!ev_is_active (w)))
521	return;	2333	return;
522		2334
523	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2335	ev_io_stop (EV_A_ &w->io);
524	ev_stop ((struct ev_watcher *)w);	2336	ev_prepare_stop (EV_A_ &w->prepare);
		2337
		2338	ev_stop (EV_A_ (W)w);
525	}	2339	}
		2340	#endif
		2341
		2342	#if EV_FORK_ENABLE
		2343	void
		2344	ev_fork_start (EV_P_ ev_fork *w)
		2345	{
		2346	if (expect_false (ev_is_active (w)))
		2347	return;
		2348
		2349	ev_start (EV_A_ (W)w, ++forkcnt);
		2350	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2351	forks [forkcnt - 1] = w;
		2352	}
		2353
		2354	void
		2355	ev_fork_stop (EV_P_ ev_fork *w)
		2356	{
		2357	clear_pending (EV_A_ (W)w);
		2358	if (expect_false (!ev_is_active (w)))
		2359	return;
		2360
		2361	{
		2362	int active = ((W)w)->active;
		2363	forks [active - 1] = forks [--forkcnt];
		2364	((W)forks [active - 1])->active = active;
		2365	}
		2366
		2367	ev_stop (EV_A_ (W)w);
		2368	}
		2369	#endif
526		2370
527	/*****************************************************************************/	2371	/*****************************************************************************/
528	#if 1	2372
		2373	struct ev_once
		2374	{
		2375	ev_io io;
		2376	ev_timer to;
		2377	void (*cb)(int revents, void *arg);
		2378	void *arg;
		2379	};
529		2380
530	static void	2381	static void
531	sin_cb (struct ev_io *w, int revents)	2382	once_cb (EV_P_ struct ev_once *once, int revents)
532	{	2383	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2384	void (*cb)(int revents, void *arg) = once->cb;
		2385	void *arg = once->arg;
		2386
		2387	ev_io_stop (EV_A_ &once->io);
		2388	ev_timer_stop (EV_A_ &once->to);
		2389	ev_free (once);
		2390
		2391	cb (revents, arg);
534	}	2392	}
535		2393
536	static void	2394	static void
		2395	once_cb_io (EV_P_ ev_io *w, int revents)
		2396	{
		2397	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2398	}
		2399
		2400	static void
537	ocb (struct ev_timer *w, int revents)	2401	once_cb_to (EV_P_ ev_timer *w, int revents)
538	{	2402	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2403	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
540	evtimer_stop (w);
541	evtimer_start (w);
542	}	2404	}
543		2405
544	int main (void)	2406	void
		2407	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
545	{	2408	{
546	struct ev_io sin;	2409	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
547		2410
548	ev_init (0);	2411	if (expect_false (!once))
549
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);
552	evio_start (&sin);
553
554	struct ev_timer t[10000];
555
556	#if 1
557	int i;
558	for (i = 0; i < 10000; ++i)
559	{
560	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);
563	evtimer_start (w);
564	if (drand48 () < 0.5)
565	evtimer_stop (w);
566	}	2412	{
567	#endif	2413	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
568
569	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);
573
574	ev_loop (0);
575
576	return 0;	2414	return;
577	}	2415	}
578		2416
579	#endif	2417	once->cb = cb;
		2418	once->arg = arg;
580		2419
		2420	ev_init (&once->io, once_cb_io);
		2421	if (fd >= 0)
		2422	{
		2423	ev_io_set (&once->io, fd, events);
		2424	ev_io_start (EV_A_ &once->io);
		2425	}
581		2426
		2427	ev_init (&once->to, once_cb_to);
		2428	if (timeout >= 0.)
		2429	{
		2430	ev_timer_set (&once->to, timeout, 0.);
		2431	ev_timer_start (EV_A_ &once->to);
		2432	}
		2433	}
582		2434
		2435	#if EV_MULTIPLICITY
		2436	#include "ev_wrap.h"
		2437	#endif
583		2438
		2439	#ifdef __cplusplus
		2440	}
		2441	#endif
		2442

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