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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 1.205 by root, Sun Jan 20 15:37:03 2008 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 modifica-
		8	* tion, are permitted provided that the following conditions are met:
		9	*
		10	* 1. Redistributions of source code must retain the above copyright notice,
		11	* this list of conditions and the following disclaimer.
		12	*
		13	* 2. Redistributions in binary form must reproduce the above copyright
		14	* notice, this list of conditions and the following disclaimer in the
		15	* documentation and/or other materials provided with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
		18	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
		19	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
		20	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
		21	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
		22	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
		23	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
		24	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
		25	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
		26	* OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*
		28	* Alternatively, the contents of this file may be used under the terms of
		29	* the GNU General Public License ("GPL") version 2 or any later version,
		30	* in which case the provisions of the GPL are applicable instead of
		31	* the above. If you wish to allow the use of your version of this file
		32	* only under the terms of the GPL and not to allow others to use your
		33	* version of this file under the BSD license, indicate your decision
		34	* by deleting the provisions above and replace them with the notice
		35	* and other provisions required by the GPL. If you do not delete the
		36	* provisions above, a recipient may use your version of this file under
		37	* either the BSD or the GPL.
		38	*/
		39
		40	#ifdef __cplusplus
		41	extern "C" {
		42	#endif
		43
		44	#ifndef EV_STANDALONE
		45	# ifdef EV_CONFIG_H
		46	# include EV_CONFIG_H
		47	# else
		48	# include "config.h"
		49	# endif
		50
		51	# if HAVE_CLOCK_GETTIME
		52	# ifndef EV_USE_MONOTONIC
		53	# define EV_USE_MONOTONIC 1
		54	# endif
		55	# ifndef EV_USE_REALTIME
		56	# define EV_USE_REALTIME 1
		57	# endif
		58	# else
		59	# ifndef EV_USE_MONOTONIC
		60	# define EV_USE_MONOTONIC 0
		61	# endif
		62	# ifndef EV_USE_REALTIME
		63	# define EV_USE_REALTIME 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_NANOSLEEP
		68	# if HAVE_NANOSLEEP
		69	# define EV_USE_NANOSLEEP 1
		70	# else
		71	# define EV_USE_NANOSLEEP 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_SELECT
		76	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		77	# define EV_USE_SELECT 1
		78	# else
		79	# define EV_USE_SELECT 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_POLL
		84	# if HAVE_POLL && HAVE_POLL_H
		85	# define EV_USE_POLL 1
		86	# else
		87	# define EV_USE_POLL 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_EPOLL
		92	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		93	# define EV_USE_EPOLL 1
		94	# else
		95	# define EV_USE_EPOLL 0
		96	# endif
		97	# endif
		98
		99	# ifndef EV_USE_KQUEUE
		100	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		101	# define EV_USE_KQUEUE 1
		102	# else
		103	# define EV_USE_KQUEUE 0
		104	# endif
		105	# endif
		106
		107	# ifndef EV_USE_PORT
		108	# if HAVE_PORT_H && HAVE_PORT_CREATE
		109	# define EV_USE_PORT 1
		110	# else
		111	# define EV_USE_PORT 0
		112	# endif
		113	# endif
		114
		115	# ifndef EV_USE_INOTIFY
		116	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		117	# define EV_USE_INOTIFY 1
		118	# else
		119	# define EV_USE_INOTIFY 0
		120	# endif
		121	# endif
		122
		123	#endif
		124
1	#include <math.h>	125	#include <math.h>
2	#include <stdlib.h>	126	#include <stdlib.h>
		127	#include <fcntl.h>
		128	#include <stddef.h>
3		129
4	#include <stdio.h>	130	#include <stdio.h>
5		131
		132	#include <assert.h>
6	#include <errno.h>	133	#include <errno.h>
7	#include <sys/time.h>	134	#include <sys/types.h>
8	#include <time.h>	135	#include <time.h>
9		136
		137	#include <signal.h>
		138
		139	#ifdef EV_H
		140	# include EV_H
		141	#else
		142	# include "ev.h"
		143	#endif
		144
		145	#ifndef _WIN32
		146	# include <sys/time.h>
		147	# include <sys/wait.h>
		148	# include <unistd.h>
		149	#else
		150	# define WIN32_LEAN_AND_MEAN
		151	# include <windows.h>
		152	# ifndef EV_SELECT_IS_WINSOCKET
		153	# define EV_SELECT_IS_WINSOCKET 1
		154	# endif
		155	#endif
		156
		157	/**/
		158
		159	#ifndef EV_USE_MONOTONIC
		160	# define EV_USE_MONOTONIC 0
		161	#endif
		162
		163	#ifndef EV_USE_REALTIME
		164	# define EV_USE_REALTIME 0
		165	#endif
		166
		167	#ifndef EV_USE_NANOSLEEP
		168	# define EV_USE_NANOSLEEP 0
		169	#endif
		170
		171	#ifndef EV_USE_SELECT
		172	# define EV_USE_SELECT 1
		173	#endif
		174
		175	#ifndef EV_USE_POLL
		176	# ifdef _WIN32
		177	# define EV_USE_POLL 0
		178	# else
		179	# define EV_USE_POLL 1
		180	# endif
		181	#endif
		182
		183	#ifndef EV_USE_EPOLL
		184	# define EV_USE_EPOLL 0
		185	#endif
		186
		187	#ifndef EV_USE_KQUEUE
		188	# define EV_USE_KQUEUE 0
		189	#endif
		190
		191	#ifndef EV_USE_PORT
		192	# define EV_USE_PORT 0
		193	#endif
		194
		195	#ifndef EV_USE_INOTIFY
		196	# define EV_USE_INOTIFY 0
		197	#endif
		198
		199	#ifndef EV_PID_HASHSIZE
		200	# if EV_MINIMAL
		201	# define EV_PID_HASHSIZE 1
		202	# else
		203	# define EV_PID_HASHSIZE 16
		204	# endif
		205	#endif
		206
		207	#ifndef EV_INOTIFY_HASHSIZE
		208	# if EV_MINIMAL
		209	# define EV_INOTIFY_HASHSIZE 1
		210	# else
		211	# define EV_INOTIFY_HASHSIZE 16
		212	# endif
		213	#endif
		214
		215	/**/
		216
10	#ifdef CLOCK_MONOTONIC	217	#ifndef CLOCK_MONOTONIC
		218	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	219	# define EV_USE_MONOTONIC 0
		220	#endif
		221
		222	#ifndef CLOCK_REALTIME
		223	# undef EV_USE_REALTIME
		224	# define EV_USE_REALTIME 0
		225	#endif
		226
		227	#if !EV_STAT_ENABLE
		228	# undef EV_USE_INOTIFY
		229	# define EV_USE_INOTIFY 0
		230	#endif
		231
		232	#if !EV_USE_NANOSLEEP
		233	# ifndef _WIN32
		234	# include <sys/select.h>
12	#endif	235	# endif
		236	#endif
13		237
14	#define HAVE_EPOLL 1	238	#if EV_USE_INOTIFY
15	#define HAVE_REALTIME 1	239	# include <sys/inotify.h>
16	#define HAVE_SELECT 0	240	#endif
17		241
18	#define MAX_BLOCKTIME 60.	242	#if EV_SELECT_IS_WINSOCKET
		243	# include <winsock.h>
		244	#endif
19		245
		246	/**/
		247
		248	/*
		249	* This is used to avoid floating point rounding problems.
		250	* It is added to ev_rt_now when scheduling periodics
		251	* to ensure progress, time-wise, even when rounding
		252	* errors are against us.
		253	* This value is good at least till the year 4000.
		254	* Better solutions welcome.
		255	*/
		256	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
		257
		258	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		259	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		260	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
		261
		262	#if __GNUC__ >= 4
		263	# define expect(expr,value) __builtin_expect ((expr),(value))
		264	# define noinline __attribute__ ((noinline))
		265	#else
		266	# define expect(expr,value) (expr)
		267	# define noinline
		268	# if __STDC_VERSION__ < 199901L
		269	# define inline
		270	# endif
		271	#endif
		272
		273	#define expect_false(expr) expect ((expr) != 0, 0)
		274	#define expect_true(expr) expect ((expr) != 0, 1)
		275	#define inline_size static inline
		276
		277	#if EV_MINIMAL
		278	# define inline_speed static noinline
		279	#else
		280	# define inline_speed static inline
		281	#endif
		282
		283	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		284	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		285
		286	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		287	#define EMPTY2(a,b) /* used to suppress some warnings */
		288
		289	typedef ev_watcher *W;
		290	typedef ev_watcher_list *WL;
		291	typedef ev_watcher_time *WT;
		292
		293	#if EV_USE_MONOTONIC
		294	/* sig_atomic_t is used to avoid per-thread variables or locking but still */
		295	/* giving it a reasonably high chance of working on typical architetcures */
		296	static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		297	#endif
		298
		299	#ifdef _WIN32
		300	# include "ev_win32.c"
		301	#endif
		302
		303	/*****************************************************************************/
		304
		305	static void (*syserr_cb)(const char *msg);
		306
		307	void
		308	ev_set_syserr_cb (void (*cb)(const char *msg))
		309	{
		310	syserr_cb = cb;
		311	}
		312
		313	static void noinline
		314	syserr (const char *msg)
		315	{
		316	if (!msg)
		317	msg = "(libev) system error";
		318
		319	if (syserr_cb)
		320	syserr_cb (msg);
		321	else
		322	{
		323	perror (msg);
		324	abort ();
		325	}
		326	}
		327
		328	static void *(*alloc)(void *ptr, long size);
		329
		330	void
		331	ev_set_allocator (void *(*cb)(void *ptr, long size))
		332	{
		333	alloc = cb;
		334	}
		335
		336	inline_speed void *
		337	ev_realloc (void *ptr, long size)
		338	{
		339	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		340
		341	if (!ptr && size)
		342	{
		343	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		344	abort ();
		345	}
		346
		347	return ptr;
		348	}
		349
		350	#define ev_malloc(size) ev_realloc (0, (size))
		351	#define ev_free(ptr) ev_realloc ((ptr), 0)
		352
		353	/*****************************************************************************/
		354
		355	typedef struct
		356	{
		357	WL head;
		358	unsigned char events;
		359	unsigned char reify;
		360	#if EV_SELECT_IS_WINSOCKET
		361	SOCKET handle;
		362	#endif
		363	} ANFD;
		364
		365	typedef struct
		366	{
		367	W w;
		368	int events;
		369	} ANPENDING;
		370
		371	#if EV_USE_INOTIFY
		372	typedef struct
		373	{
		374	WL head;
		375	} ANFS;
		376	#endif
		377
		378	#if EV_MULTIPLICITY
		379
		380	struct ev_loop
		381	{
		382	ev_tstamp ev_rt_now;
		383	#define ev_rt_now ((loop)->ev_rt_now)
		384	#define VAR(name,decl) decl;
		385	#include "ev_vars.h"
		386	#undef VAR
		387	};
20	#include "ev.h"	388	#include "ev_wrap.h"
21		389
22	struct ev_watcher {	390	static struct ev_loop default_loop_struct;
23	EV_WATCHER (ev_watcher);	391	struct ev_loop *ev_default_loop_ptr;
24	};
25		392
26	struct ev_watcher_list {	393	#else
27	EV_WATCHER_LIST (ev_watcher_list);
28	};
29		394
30	ev_tstamp ev_now;	395	ev_tstamp ev_rt_now;
31	int ev_method;	396	#define VAR(name,decl) static decl;
		397	#include "ev_vars.h"
		398	#undef VAR
32		399
33	static int have_monotonic; /* runtime */	400	static int ev_default_loop_ptr;
34		401
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	402	#endif
36	static void (*method_reify)(void);	403
37	static void (*method_poll)(ev_tstamp timeout);	404	/*****************************************************************************/
38		405
39	ev_tstamp	406	ev_tstamp
40	ev_time (void)	407	ev_time (void)
41	{	408	{
42	#if HAVE_REALTIME	409	#if EV_USE_REALTIME
43	struct timespec ts;	410	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	411	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	412	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	413	#else
47	struct timeval tv;	414	struct timeval tv;
48	gettimeofday (&tv, 0);	415	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	416	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	417	#endif
51	}	418	}
52		419
53	static ev_tstamp	420	ev_tstamp inline_size
54	get_clock (void)	421	get_clock (void)
55	{	422	{
56	#if HAVE_MONOTONIC	423	#if EV_USE_MONOTONIC
57	if (have_monotonic)	424	if (expect_true (have_monotonic))
58	{	425	{
59	struct timespec ts;	426	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	427	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	428	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	429	}
63	#endif	430	#endif
64		431
65	return ev_time ();	432	return ev_time ();
66	}	433	}
67		434
		435	#if EV_MULTIPLICITY
		436	ev_tstamp
		437	ev_now (EV_P)
		438	{
		439	return ev_rt_now;
		440	}
		441	#endif
		442
		443	void
		444	ev_sleep (ev_tstamp delay)
		445	{
		446	if (delay > 0.)
		447	{
		448	#if EV_USE_NANOSLEEP
		449	struct timespec ts;
		450
		451	ts.tv_sec = (time_t)delay;
		452	ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
		453
		454	nanosleep (&ts, 0);
		455	#elif defined(_WIN32)
		456	Sleep (delay * 1e3);
		457	#else
		458	struct timeval tv;
		459
		460	tv.tv_sec = (time_t)delay;
		461	tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
		462
		463	select (0, 0, 0, 0, &tv);
		464	#endif
		465	}
		466	}
		467
		468	/*****************************************************************************/
		469
		470	int inline_size
		471	array_nextsize (int elem, int cur, int cnt)
		472	{
		473	int ncur = cur + 1;
		474
		475	do
		476	ncur <<= 1;
		477	while (cnt > ncur);
		478
		479	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		480	if (elem * ncur > 4096)
		481	{
		482	ncur *= elem;
		483	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		484	ncur = ncur - sizeof (void *) * 4;
		485	ncur /= elem;
		486	}
		487
		488	return ncur;
		489	}
		490
		491	static noinline void *
		492	array_realloc (int elem, void *base, int *cur, int cnt)
		493	{
		494	*cur = array_nextsize (elem, *cur, cnt);
		495	return ev_realloc (base, elem * *cur);
		496	}
		497
68	#define array_needsize(base,cur,cnt,init) \	498	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	499	if (expect_false ((cnt) > (cur))) \
70	{ \	500	{ \
71	int newcnt = cur ? cur << 1 : 16; \	501	int ocur_ = (cur); \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	502	(base) = (type *)array_realloc \
73	base = realloc (base, sizeof (*base) * (newcnt)); \	503	(sizeof (type), (base), &(cur), (cnt)); \
74	init (base + cur, newcnt - cur); \	504	init ((base) + (ocur_), (cur) - ocur_); \
75	cur = newcnt; \	505	}
		506
		507	#if 0
		508	#define array_slim(type,stem) \
		509	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		510	{ \
		511	stem ## max = array_roundsize (stem ## cnt >> 1); \
		512	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		513	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		514	}
		515	#endif
		516
		517	#define array_free(stem, idx) \
		518	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		519
		520	/*****************************************************************************/
		521
		522	void noinline
		523	ev_feed_event (EV_P_ void *w, int revents)
		524	{
		525	W w_ = (W)w;
		526	int pri = ABSPRI (w_);
		527
		528	if (expect_false (w_->pending))
		529	pendings [pri][w_->pending - 1].events |= revents;
		530	else
		531	{
		532	w_->pending = ++pendingcnt [pri];
		533	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		534	pendings [pri][w_->pending - 1].w = w_;
		535	pendings [pri][w_->pending - 1].events = revents;
		536	}
		537	}
		538
		539	void inline_speed
		540	queue_events (EV_P_ W *events, int eventcnt, int type)
		541	{
		542	int i;
		543
		544	for (i = 0; i < eventcnt; ++i)
		545	ev_feed_event (EV_A_ events [i], type);
		546	}
		547
		548	/*****************************************************************************/
		549
		550	void inline_size
		551	anfds_init (ANFD *base, int count)
		552	{
		553	while (count--)
		554	{
		555	base->head = 0;
		556	base->events = EV_NONE;
		557	base->reify = 0;
		558
		559	++base;
		560	}
		561	}
		562
		563	void inline_speed
		564	fd_event (EV_P_ int fd, int revents)
		565	{
		566	ANFD *anfd = anfds + fd;
		567	ev_io *w;
		568
		569	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		570	{
		571	int ev = w->events & revents;
		572
		573	if (ev)
		574	ev_feed_event (EV_A_ (W)w, ev);
		575	}
		576	}
		577
		578	void
		579	ev_feed_fd_event (EV_P_ int fd, int revents)
		580	{
		581	if (fd >= 0 && fd < anfdmax)
		582	fd_event (EV_A_ fd, revents);
		583	}
		584
		585	void inline_size
		586	fd_reify (EV_P)
		587	{
		588	int i;
		589
		590	for (i = 0; i < fdchangecnt; ++i)
		591	{
		592	int fd = fdchanges [i];
		593	ANFD *anfd = anfds + fd;
		594	ev_io *w;
		595
		596	unsigned char events = 0;
		597
		598	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		599	events |= (unsigned char)w->events;
		600
		601	#if EV_SELECT_IS_WINSOCKET
		602	if (events)
		603	{
		604	unsigned long argp;
		605	#ifdef EV_FD_TO_WIN32_HANDLE
		606	anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
		607	#else
		608	anfd->handle = _get_osfhandle (fd);
		609	#endif
		610	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		611	}
		612	#endif
		613
		614	{
		615	unsigned char o_events = anfd->events;
		616	unsigned char o_reify = anfd->reify;
		617
		618	anfd->reify = 0;
		619	anfd->events = events;
		620
		621	if (o_events != events || o_reify & EV_IOFDSET)
		622	backend_modify (EV_A_ fd, o_events, events);
76	}	623	}
		624	}
		625
		626	fdchangecnt = 0;
		627	}
		628
		629	void inline_size
		630	fd_change (EV_P_ int fd, int flags)
		631	{
		632	unsigned char reify = anfds [fd].reify;
		633	anfds [fd].reify |= flags;
		634
		635	if (expect_true (!reify))
		636	{
		637	++fdchangecnt;
		638	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		639	fdchanges [fdchangecnt - 1] = fd;
		640	}
		641	}
		642
		643	void inline_speed
		644	fd_kill (EV_P_ int fd)
		645	{
		646	ev_io *w;
		647
		648	while ((w = (ev_io *)anfds [fd].head))
		649	{
		650	ev_io_stop (EV_A_ w);
		651	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		652	}
		653	}
		654
		655	int inline_size
		656	fd_valid (int fd)
		657	{
		658	#ifdef _WIN32
		659	return _get_osfhandle (fd) != -1;
		660	#else
		661	return fcntl (fd, F_GETFD) != -1;
		662	#endif
		663	}
		664
		665	/* called on EBADF to verify fds */
		666	static void noinline
		667	fd_ebadf (EV_P)
		668	{
		669	int fd;
		670
		671	for (fd = 0; fd < anfdmax; ++fd)
		672	if (anfds [fd].events)
		673	if (!fd_valid (fd) == -1 && errno == EBADF)
		674	fd_kill (EV_A_ fd);
		675	}
		676
		677	/* called on ENOMEM in select/poll to kill some fds and retry */
		678	static void noinline
		679	fd_enomem (EV_P)
		680	{
		681	int fd;
		682
		683	for (fd = anfdmax; fd--; )
		684	if (anfds [fd].events)
		685	{
		686	fd_kill (EV_A_ fd);
		687	return;
		688	}
		689	}
		690
		691	/* usually called after fork if backend needs to re-arm all fds from scratch */
		692	static void noinline
		693	fd_rearm_all (EV_P)
		694	{
		695	int fd;
		696
		697	for (fd = 0; fd < anfdmax; ++fd)
		698	if (anfds [fd].events)
		699	{
		700	anfds [fd].events = 0;
		701	fd_change (EV_A_ fd, EV_IOFDSET | 1);
		702	}
		703	}
		704
		705	/*****************************************************************************/
		706
		707	void inline_speed
		708	upheap (WT *heap, int k)
		709	{
		710	WT w = heap [k];
		711
		712	while (k)
		713	{
		714	int p = (k - 1) >> 1;
		715
		716	if (heap [p]->at <= w->at)
		717	break;
		718
		719	heap [k] = heap [p];
		720	((W)heap [k])->active = k + 1;
		721	k = p;
		722	}
		723
		724	heap [k] = w;
		725	((W)heap [k])->active = k + 1;
		726	}
		727
		728	void inline_speed
		729	downheap (WT *heap, int N, int k)
		730	{
		731	WT w = heap [k];
		732
		733	for (;;)
		734	{
		735	int c = (k << 1) + 1;
		736
		737	if (c >= N)
		738	break;
		739
		740	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		741	? 1 : 0;
		742
		743	if (w->at <= heap [c]->at)
		744	break;
		745
		746	heap [k] = heap [c];
		747	((W)heap [k])->active = k + 1;
		748
		749	k = c;
		750	}
		751
		752	heap [k] = w;
		753	((W)heap [k])->active = k + 1;
		754	}
		755
		756	void inline_size
		757	adjustheap (WT *heap, int N, int k)
		758	{
		759	upheap (heap, k);
		760	downheap (heap, N, k);
		761	}
		762
		763	/*****************************************************************************/
77		764
78	typedef struct	765	typedef struct
79	{	766	{
80	struct ev_io *head;	767	WL head;
81	unsigned char wev, rev; /* want, received event set */	768	sig_atomic_t volatile gotsig;
82	} ANFD;	769	} ANSIG;
83		770
84	static ANFD *anfds;	771	static ANSIG *signals;
85	static int anfdmax;	772	static int signalmax;
86		773
87	static int *fdchanges;	774	static int sigpipe [2];
88	static int fdchangemax, fdchangecnt;	775	static sig_atomic_t volatile gotsig;
		776	static ev_io sigev;
		777
		778	void inline_size
		779	signals_init (ANSIG *base, int count)
		780	{
		781	while (count--)
		782	{
		783	base->head = 0;
		784	base->gotsig = 0;
		785
		786	++base;
		787	}
		788	}
89		789
90	static void	790	static void
91	anfds_init (ANFD *base, int count)	791	sighandler (int signum)
92	{	792	{
93	while (count--)	793	#if _WIN32
94	{	794	signal (signum, sighandler);
95	base->head = 0;	795	#endif
96	base->wev = base->rev = EV_NONE;	796
97	++base;	797	signals [signum - 1].gotsig = 1;
		798
		799	if (!gotsig)
98	}	800	{
		801	int old_errno = errno;
		802	gotsig = 1;
		803	write (sigpipe [1], &signum, 1);
		804	errno = old_errno;
		805	}
99	}	806	}
100		807
101	typedef struct	808	void noinline
		809	ev_feed_signal_event (EV_P_ int signum)
102	{	810	{
103	struct ev_watcher *w;	811	WL w;
104	int events;
105	} ANPENDING;
106		812
107	static ANPENDING *pendings;	813	#if EV_MULTIPLICITY
108	static int pendingmax, pendingcnt;	814	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		815	#endif
		816
		817	--signum;
		818
		819	if (signum < 0 || signum >= signalmax)
		820	return;
		821
		822	signals [signum].gotsig = 0;
		823
		824	for (w = signals [signum].head; w; w = w->next)
		825	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		826	}
109		827
110	static void	828	static void
111	event (struct ev_watcher *w, int events)	829	sigcb (EV_P_ ev_io *iow, int revents)
112	{	830	{
113	w->pending = ++pendingcnt;	831	int signum;
114	array_needsize (pendings, pendingmax, pendingcnt, );	832
115	pendings [pendingcnt - 1].w = w;	833	read (sigpipe [0], &revents, 1);
116	pendings [pendingcnt - 1].events = events;	834	gotsig = 0;
		835
		836	for (signum = signalmax; signum--; )
		837	if (signals [signum].gotsig)
		838	ev_feed_signal_event (EV_A_ signum + 1);
117	}	839	}
		840
		841	void inline_speed
		842	fd_intern (int fd)
		843	{
		844	#ifdef _WIN32
		845	int arg = 1;
		846	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		847	#else
		848	fcntl (fd, F_SETFD, FD_CLOEXEC);
		849	fcntl (fd, F_SETFL, O_NONBLOCK);
		850	#endif
		851	}
		852
		853	static void noinline
		854	siginit (EV_P)
		855	{
		856	fd_intern (sigpipe [0]);
		857	fd_intern (sigpipe [1]);
		858
		859	ev_io_set (&sigev, sigpipe [0], EV_READ);
		860	ev_io_start (EV_A_ &sigev);
		861	ev_unref (EV_A); /* child watcher should not keep loop alive */
		862	}
		863
		864	/*****************************************************************************/
		865
		866	static WL childs [EV_PID_HASHSIZE];
		867
		868	#ifndef _WIN32
		869
		870	static ev_signal childev;
		871
		872	void inline_speed
		873	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		874	{
		875	ev_child *w;
		876
		877	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		878	if (w->pid == pid || !w->pid)
		879	{
		880	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
		881	w->rpid = pid;
		882	w->rstatus = status;
		883	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		884	}
		885	}
		886
		887	#ifndef WCONTINUED
		888	# define WCONTINUED 0
		889	#endif
118		890
119	static void	891	static void
120	fd_event (int fd, int events)	892	childcb (EV_P_ ev_signal *sw, int revents)
121	{	893	{
122	ANFD *anfd = anfds + fd;	894	int pid, status;
123	struct ev_io *w;
124		895
125	for (w = anfd->head; w; w = w->next)	896	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
126	{	897	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
127	int ev = w->events & events;	898	if (!WCONTINUED
		899	|| errno != EINVAL
		900	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		901	return;
128		902
129	if (ev)	903	/* make sure we are called again until all childs have been reaped */
130	event ((struct ev_watcher *)w, ev);	904	/* we need to do it this way so that the callback gets called before we continue */
131	}	905	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
132	}
133		906
134	static struct ev_timer **timers;	907	child_reap (EV_A_ sw, pid, pid, status);
135	static int timermax, timercnt;	908	if (EV_PID_HASHSIZE > 1)
136		909	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	}	910	}
153		911
154	static void	912	#endif
155	downheap (int k)
156	{
157	struct ev_timer *w = timers [k];
158		913
159	while (k < (timercnt >> 1))	914	/*****************************************************************************/
160	{
161	int j = k << 1;
162		915
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	916	#if EV_USE_PORT
164	++j;	917	# include "ev_port.c"
165		918	#endif
166	if (w->at <= timers [j]->at)	919	#if EV_USE_KQUEUE
167	break;	920	# include "ev_kqueue.c"
168		921	#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	922	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	923	# include "ev_epoll.c"
190	#endif	924	#endif
		925	#if EV_USE_POLL
		926	# include "ev_poll.c"
		927	#endif
191	#if HAVE_SELECT	928	#if EV_USE_SELECT
192	# include "ev_select.c"	929	# include "ev_select.c"
193	#endif	930	#endif
194		931
195	int ev_init (int flags)	932	int
		933	ev_version_major (void)
196	{	934	{
		935	return EV_VERSION_MAJOR;
		936	}
		937
		938	int
		939	ev_version_minor (void)
		940	{
		941	return EV_VERSION_MINOR;
		942	}
		943
		944	/* return true if we are running with elevated privileges and should ignore env variables */
		945	int inline_size
		946	enable_secure (void)
		947	{
		948	#ifdef _WIN32
		949	return 0;
		950	#else
		951	return getuid () != geteuid ()
		952	|| getgid () != getegid ();
		953	#endif
		954	}
		955
		956	unsigned int
		957	ev_supported_backends (void)
		958	{
		959	unsigned int flags = 0;
		960
		961	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		962	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		963	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		964	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		965	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		966
		967	return flags;
		968	}
		969
		970	unsigned int
		971	ev_recommended_backends (void)
		972	{
		973	unsigned int flags = ev_supported_backends ();
		974
		975	#ifndef __NetBSD__
		976	/* kqueue is borked on everything but netbsd apparently */
		977	/* it usually doesn't work correctly on anything but sockets and pipes */
		978	flags &= ~EVBACKEND_KQUEUE;
		979	#endif
		980	#ifdef __APPLE__
		981	// flags &= ~EVBACKEND_KQUEUE; for documentation
		982	flags &= ~EVBACKEND_POLL;
		983	#endif
		984
		985	return flags;
		986	}
		987
		988	unsigned int
		989	ev_embeddable_backends (void)
		990	{
		991	int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
		992
		993	/* epoll embeddability broken on all linux versions up to at least 2.6.23 */
		994	/* please fix it and tell me how to detect the fix */
		995	flags &= ~EVBACKEND_EPOLL;
		996
		997	return flags;
		998	}
		999
		1000	unsigned int
		1001	ev_backend (EV_P)
		1002	{
		1003	return backend;
		1004	}
		1005
		1006	unsigned int
		1007	ev_loop_count (EV_P)
		1008	{
		1009	return loop_count;
		1010	}
		1011
		1012	void
		1013	ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
		1014	{
		1015	io_blocktime = interval;
		1016	}
		1017
		1018	void
		1019	ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
		1020	{
		1021	timeout_blocktime = interval;
		1022	}
		1023
		1024	static void noinline
		1025	loop_init (EV_P_ unsigned int flags)
		1026	{
		1027	if (!backend)
		1028	{
197	#if HAVE_MONOTONIC	1029	#if EV_USE_MONOTONIC
198	{	1030	{
199	struct timespec ts;	1031	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	1032	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	1033	have_monotonic = 1;
202	}	1034	}
203	#endif	1035	#endif
204		1036
205	ev_now = ev_time ();	1037	ev_rt_now = ev_time ();
		1038	mn_now = get_clock ();
		1039	now_floor = mn_now;
		1040	rtmn_diff = ev_rt_now - mn_now;
206		1041
		1042	io_blocktime = 0.;
		1043	timeout_blocktime = 0.;
		1044
		1045	/* pid check not overridable via env */
		1046	#ifndef _WIN32
		1047	if (flags & EVFLAG_FORKCHECK)
		1048	curpid = getpid ();
		1049	#endif
		1050
		1051	if (!(flags & EVFLAG_NOENV)
		1052	&& !enable_secure ()
		1053	&& getenv ("LIBEV_FLAGS"))
		1054	flags = atoi (getenv ("LIBEV_FLAGS"));
		1055
		1056	if (!(flags & 0x0000ffffUL))
		1057	flags |= ev_recommended_backends ();
		1058
		1059	backend = 0;
		1060	backend_fd = -1;
		1061	#if EV_USE_INOTIFY
		1062	fs_fd = -2;
		1063	#endif
		1064
		1065	#if EV_USE_PORT
		1066	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		1067	#endif
		1068	#if EV_USE_KQUEUE
		1069	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		1070	#endif
207	#if HAVE_EPOLL	1071	#if EV_USE_EPOLL
208	if (epoll_init (flags))	1072	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
209	return ev_method;
210	#endif	1073	#endif
		1074	#if EV_USE_POLL
		1075	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		1076	#endif
211	#if HAVE_SELECT	1077	#if EV_USE_SELECT
212	if (select_init (flags))	1078	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
213	return ev_method;
214	#endif	1079	#endif
215		1080
216	ev_method = EVMETHOD_NONE;	1081	ev_init (&sigev, sigcb);
217	return ev_method;	1082	ev_set_priority (&sigev, EV_MAXPRI);
		1083	}
218	}	1084	}
219		1085
220	void ev_prefork (void)	1086	static void noinline
221	{	1087	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	{	1088	{
238	int i;	1089	int i;
239		1090
240	for (i = 0; i < pendingcnt; ++i)	1091	#if EV_USE_INOTIFY
		1092	if (fs_fd >= 0)
		1093	close (fs_fd);
		1094	#endif
		1095
		1096	if (backend_fd >= 0)
		1097	close (backend_fd);
		1098
		1099	#if EV_USE_PORT
		1100	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1101	#endif
		1102	#if EV_USE_KQUEUE
		1103	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1104	#endif
		1105	#if EV_USE_EPOLL
		1106	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1107	#endif
		1108	#if EV_USE_POLL
		1109	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1110	#endif
		1111	#if EV_USE_SELECT
		1112	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1113	#endif
		1114
		1115	for (i = NUMPRI; i--; )
		1116	{
		1117	array_free (pending, [i]);
		1118	#if EV_IDLE_ENABLE
		1119	array_free (idle, [i]);
		1120	#endif
241	{	1121	}
242	ANPENDING *p = pendings + i;
243		1122
244	if (p->w)	1123	ev_free (anfds); anfdmax = 0;
		1124
		1125	/* have to use the microsoft-never-gets-it-right macro */
		1126	array_free (fdchange, EMPTY);
		1127	array_free (timer, EMPTY);
		1128	#if EV_PERIODIC_ENABLE
		1129	array_free (periodic, EMPTY);
		1130	#endif
		1131	#if EV_FORK_ENABLE
		1132	array_free (fork, EMPTY);
		1133	#endif
		1134	array_free (prepare, EMPTY);
		1135	array_free (check, EMPTY);
		1136
		1137	backend = 0;
		1138	}
		1139
		1140	void inline_size infy_fork (EV_P);
		1141
		1142	void inline_size
		1143	loop_fork (EV_P)
		1144	{
		1145	#if EV_USE_PORT
		1146	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1147	#endif
		1148	#if EV_USE_KQUEUE
		1149	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1150	#endif
		1151	#if EV_USE_EPOLL
		1152	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1153	#endif
		1154	#if EV_USE_INOTIFY
		1155	infy_fork (EV_A);
		1156	#endif
		1157
		1158	if (ev_is_active (&sigev))
		1159	{
		1160	/* default loop */
		1161
		1162	ev_ref (EV_A);
		1163	ev_io_stop (EV_A_ &sigev);
		1164	close (sigpipe [0]);
		1165	close (sigpipe [1]);
		1166
		1167	while (pipe (sigpipe))
		1168	syserr ("(libev) error creating pipe");
		1169
		1170	siginit (EV_A);
		1171	sigcb (EV_A_ &sigev, EV_READ);
		1172	}
		1173
		1174	postfork = 0;
		1175	}
		1176
		1177	#if EV_MULTIPLICITY
		1178	struct ev_loop *
		1179	ev_loop_new (unsigned int flags)
		1180	{
		1181	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1182
		1183	memset (loop, 0, sizeof (struct ev_loop));
		1184
		1185	loop_init (EV_A_ flags);
		1186
		1187	if (ev_backend (EV_A))
		1188	return loop;
		1189
		1190	return 0;
		1191	}
		1192
		1193	void
		1194	ev_loop_destroy (EV_P)
		1195	{
		1196	loop_destroy (EV_A);
		1197	ev_free (loop);
		1198	}
		1199
		1200	void
		1201	ev_loop_fork (EV_P)
		1202	{
		1203	postfork = 1; /* must be in line with ev_default_fork */
		1204	}
		1205
		1206	#endif
		1207
		1208	#if EV_MULTIPLICITY
		1209	struct ev_loop *
		1210	ev_default_loop_init (unsigned int flags)
		1211	#else
		1212	int
		1213	ev_default_loop (unsigned int flags)
		1214	#endif
		1215	{
		1216	if (sigpipe [0] == sigpipe [1])
		1217	if (pipe (sigpipe))
		1218	return 0;
		1219
		1220	if (!ev_default_loop_ptr)
		1221	{
		1222	#if EV_MULTIPLICITY
		1223	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1224	#else
		1225	ev_default_loop_ptr = 1;
		1226	#endif
		1227
		1228	loop_init (EV_A_ flags);
		1229
		1230	if (ev_backend (EV_A))
245	{	1231	{
246	p->w->pending = 0;	1232	siginit (EV_A);
247	p->w->cb (p->w, p->events);	1233
		1234	#ifndef _WIN32
		1235	ev_signal_init (&childev, childcb, SIGCHLD);
		1236	ev_set_priority (&childev, EV_MAXPRI);
		1237	ev_signal_start (EV_A_ &childev);
		1238	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1239	#endif
248	}	1240	}
		1241	else
		1242	ev_default_loop_ptr = 0;
		1243	}
		1244
		1245	return ev_default_loop_ptr;
		1246	}
		1247
		1248	void
		1249	ev_default_destroy (void)
		1250	{
		1251	#if EV_MULTIPLICITY
		1252	struct ev_loop *loop = ev_default_loop_ptr;
		1253	#endif
		1254
		1255	#ifndef _WIN32
		1256	ev_ref (EV_A); /* child watcher */
		1257	ev_signal_stop (EV_A_ &childev);
		1258	#endif
		1259
		1260	ev_ref (EV_A); /* signal watcher */
		1261	ev_io_stop (EV_A_ &sigev);
		1262
		1263	close (sigpipe [0]); sigpipe [0] = 0;
		1264	close (sigpipe [1]); sigpipe [1] = 0;
		1265
		1266	loop_destroy (EV_A);
		1267	}
		1268
		1269	void
		1270	ev_default_fork (void)
		1271	{
		1272	#if EV_MULTIPLICITY
		1273	struct ev_loop *loop = ev_default_loop_ptr;
		1274	#endif
		1275
		1276	if (backend)
		1277	postfork = 1; /* must be in line with ev_loop_fork */
		1278	}
		1279
		1280	/*****************************************************************************/
		1281
		1282	void
		1283	ev_invoke (EV_P_ void *w, int revents)
		1284	{
		1285	EV_CB_INVOKE ((W)w, revents);
		1286	}
		1287
		1288	void inline_speed
		1289	call_pending (EV_P)
		1290	{
		1291	int pri;
		1292
		1293	for (pri = NUMPRI; pri--; )
		1294	while (pendingcnt [pri])
		1295	{
		1296	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1297
		1298	if (expect_true (p->w))
		1299	{
		1300	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1301
		1302	p->w->pending = 0;
		1303	EV_CB_INVOKE (p->w, p->events);
		1304	}
249	}	1305	}
250
251	pendingcnt = 0;
252	}	1306	}
253		1307
254	static void	1308	void inline_size
255	timer_reify (void)	1309	timers_reify (EV_P)
256	{	1310	{
257	while (timercnt && timers [0]->at <= ev_now)	1311	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	1312	{
259	struct ev_timer *w = timers [0];	1313	ev_timer *w = (ev_timer *)timers [0];
260		1314
		1315	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
		1316
261	/* first reschedule timer */	1317	/* first reschedule or stop timer */
262	if (w->repeat)	1318	if (w->repeat)
263	{	1319	{
264	if (w->is_abs)	1320	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;	1321
266	else
267	w->at = ev_now + w->repeat;	1322	((WT)w)->at += w->repeat;
		1323	if (((WT)w)->at < mn_now)
		1324	((WT)w)->at = mn_now;
268		1325
269	downheap (0);	1326	downheap (timers, timercnt, 0);
270	}	1327	}
271	else	1328	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1329	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1330
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1331	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1332	}
		1333	}
		1334
		1335	#if EV_PERIODIC_ENABLE
		1336	void inline_size
		1337	periodics_reify (EV_P)
		1338	{
		1339	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	1340	{
276	}	1341	ev_periodic *w = (ev_periodic *)periodics [0];
277		1342
278	int ev_loop_done;	1343	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
279		1344
		1345	/* first reschedule or stop timer */
		1346	if (w->reschedule_cb)
		1347	{
		1348	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
		1349	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1350	downheap (periodics, periodiccnt, 0);
		1351	}
		1352	else if (w->interval)
		1353	{
		1354	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1355	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1356	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1357	downheap (periodics, periodiccnt, 0);
		1358	}
		1359	else
		1360	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1361
		1362	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1363	}
		1364	}
		1365
		1366	static void noinline
		1367	periodics_reschedule (EV_P)
		1368	{
		1369	int i;
		1370
		1371	/* adjust periodics after time jump */
		1372	for (i = 0; i < periodiccnt; ++i)
		1373	{
		1374	ev_periodic *w = (ev_periodic *)periodics [i];
		1375
		1376	if (w->reschedule_cb)
		1377	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1378	else if (w->interval)
		1379	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1380	}
		1381
		1382	/* now rebuild the heap */
		1383	for (i = periodiccnt >> 1; i--; )
		1384	downheap (periodics, periodiccnt, i);
		1385	}
		1386	#endif
		1387
		1388	#if EV_IDLE_ENABLE
		1389	void inline_size
		1390	idle_reify (EV_P)
		1391	{
		1392	if (expect_false (idleall))
		1393	{
		1394	int pri;
		1395
		1396	for (pri = NUMPRI; pri--; )
		1397	{
		1398	if (pendingcnt [pri])
		1399	break;
		1400
		1401	if (idlecnt [pri])
		1402	{
		1403	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1404	break;
		1405	}
		1406	}
		1407	}
		1408	}
		1409	#endif
		1410
		1411	void inline_speed
		1412	time_update (EV_P_ ev_tstamp max_block)
		1413	{
		1414	int i;
		1415
		1416	#if EV_USE_MONOTONIC
		1417	if (expect_true (have_monotonic))
		1418	{
		1419	ev_tstamp odiff = rtmn_diff;
		1420
		1421	mn_now = get_clock ();
		1422
		1423	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1424	/* interpolate in the meantime */
		1425	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1426	{
		1427	ev_rt_now = rtmn_diff + mn_now;
		1428	return;
		1429	}
		1430
		1431	now_floor = mn_now;
		1432	ev_rt_now = ev_time ();
		1433
		1434	/* loop a few times, before making important decisions.
		1435	* on the choice of "4": one iteration isn't enough,
		1436	* in case we get preempted during the calls to
		1437	* ev_time and get_clock. a second call is almost guaranteed
		1438	* to succeed in that case, though. and looping a few more times
		1439	* doesn't hurt either as we only do this on time-jumps or
		1440	* in the unlikely event of having been preempted here.
		1441	*/
		1442	for (i = 4; --i; )
		1443	{
		1444	rtmn_diff = ev_rt_now - mn_now;
		1445
		1446	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1447	return; /* all is well */
		1448
		1449	ev_rt_now = ev_time ();
		1450	mn_now = get_clock ();
		1451	now_floor = mn_now;
		1452	}
		1453
		1454	# if EV_PERIODIC_ENABLE
		1455	periodics_reschedule (EV_A);
		1456	# endif
		1457	/* no timer adjustment, as the monotonic clock doesn't jump */
		1458	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1459	}
		1460	else
		1461	#endif
		1462	{
		1463	ev_rt_now = ev_time ();
		1464
		1465	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
		1466	{
		1467	#if EV_PERIODIC_ENABLE
		1468	periodics_reschedule (EV_A);
		1469	#endif
		1470	/* adjust timers. this is easy, as the offset is the same for all of them */
		1471	for (i = 0; i < timercnt; ++i)
		1472	((WT)timers [i])->at += ev_rt_now - mn_now;
		1473	}
		1474
		1475	mn_now = ev_rt_now;
		1476	}
		1477	}
		1478
		1479	void
		1480	ev_ref (EV_P)
		1481	{
		1482	++activecnt;
		1483	}
		1484
		1485	void
		1486	ev_unref (EV_P)
		1487	{
		1488	--activecnt;
		1489	}
		1490
		1491	static int loop_done;
		1492
		1493	void
280	int ev_loop (int flags)	1494	ev_loop (EV_P_ int flags)
281	{	1495	{
282	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1496	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1497	? EVUNLOOP_ONE
		1498	: EVUNLOOP_CANCEL;
		1499
		1500	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
284		1501
285	do	1502	do
286	{	1503	{
		1504	#ifndef _WIN32
		1505	if (expect_false (curpid)) /* penalise the forking check even more */
		1506	if (expect_false (getpid () != curpid))
		1507	{
		1508	curpid = getpid ();
		1509	postfork = 1;
		1510	}
		1511	#endif
		1512
		1513	#if EV_FORK_ENABLE
		1514	/* we might have forked, so queue fork handlers */
		1515	if (expect_false (postfork))
		1516	if (forkcnt)
		1517	{
		1518	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1519	call_pending (EV_A);
		1520	}
		1521	#endif
		1522
		1523	/* queue prepare watchers (and execute them) */
		1524	if (expect_false (preparecnt))
		1525	{
		1526	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1527	call_pending (EV_A);
		1528	}
		1529
		1530	if (expect_false (!activecnt))
		1531	break;
		1532
		1533	/* we might have forked, so reify kernel state if necessary */
		1534	if (expect_false (postfork))
		1535	loop_fork (EV_A);
		1536
287	/* update fd-related kernel structures */	1537	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1538	fd_reify (EV_A);
289		1539
290	/* calculate blocking time */	1540	/* calculate blocking time */
291	ev_now = ev_time ();	1541	{
		1542	ev_tstamp waittime = 0.;
		1543	ev_tstamp sleeptime = 0.;
292		1544
293	if (flags & EVLOOP_NONBLOCK)	1545	if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
294	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else
298	{	1546	{
299	block = timers [0]->at - ev_now + method_fudge;	1547	/* update time to cancel out callback processing overhead */
300	if (block < 0.) block = 0.;	1548	time_update (EV_A_ 1e100);
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;	1549
		1550	waittime = MAX_BLOCKTIME;
		1551
		1552	if (timercnt)
		1553	{
		1554	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
		1555	if (waittime > to) waittime = to;
		1556	}
		1557
		1558	#if EV_PERIODIC_ENABLE
		1559	if (periodiccnt)
		1560	{
		1561	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
		1562	if (waittime > to) waittime = to;
		1563	}
		1564	#endif
		1565
		1566	if (expect_false (waittime < timeout_blocktime))
		1567	waittime = timeout_blocktime;
		1568
		1569	sleeptime = waittime - backend_fudge;
		1570
		1571	if (expect_true (sleeptime > io_blocktime))
		1572	sleeptime = io_blocktime;
		1573
		1574	if (sleeptime)
		1575	{
		1576	ev_sleep (sleeptime);
		1577	waittime -= sleeptime;
		1578	}
302	}	1579	}
303		1580
304	method_poll (block);	1581	++loop_count;
		1582	backend_poll (EV_A_ waittime);
305		1583
		1584	/* update ev_rt_now, do magic */
		1585	time_update (EV_A_ waittime + sleeptime);
		1586	}
		1587
306	/* put pending timers into pendign queue and reschedule them */	1588	/* queue pending timers and reschedule them */
		1589	timers_reify (EV_A); /* relative timers called last */
		1590	#if EV_PERIODIC_ENABLE
		1591	periodics_reify (EV_A); /* absolute timers called first */
		1592	#endif
		1593
		1594	#if EV_IDLE_ENABLE
		1595	/* queue idle watchers unless other events are pending */
307	timer_reify ();	1596	idle_reify (EV_A);
		1597	#endif
308		1598
309	ev_now = ev_time ();	1599	/* queue check watchers, to be executed first */
		1600	if (expect_false (checkcnt))
		1601	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1602
310	call_pending ();	1603	call_pending (EV_A);
311	}
312	while (!ev_loop_done);
313	}
314		1604
315	static void	1605	}
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1606	while (expect_true (activecnt && !loop_done));
		1607
		1608	if (loop_done == EVUNLOOP_ONE)
		1609	loop_done = EVUNLOOP_CANCEL;
		1610	}
		1611
		1612	void
		1613	ev_unloop (EV_P_ int how)
		1614	{
		1615	loop_done = how;
		1616	}
		1617
		1618	/*****************************************************************************/
		1619
		1620	void inline_size
		1621	wlist_add (WL *head, WL elem)
317	{	1622	{
318	elem->next = *head;	1623	elem->next = *head;
319	*head = elem;	1624	*head = elem;
320	}	1625	}
321		1626
322	static void	1627	void inline_size
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1628	wlist_del (WL *head, WL elem)
324	{	1629	{
325	while (*head)	1630	while (*head)
326	{	1631	{
327	if (*head == elem)	1632	if (*head == elem)
328	{	1633	{
…		…
332		1637
333	head = &(*head)->next;	1638	head = &(*head)->next;
334	}	1639	}
335	}	1640	}
336		1641
		1642	void inline_speed
		1643	clear_pending (EV_P_ W w)
		1644	{
		1645	if (w->pending)
		1646	{
		1647	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1648	w->pending = 0;
		1649	}
		1650	}
		1651
		1652	int
		1653	ev_clear_pending (EV_P_ void *w)
		1654	{
		1655	W w_ = (W)w;
		1656	int pending = w_->pending;
		1657
		1658	if (expect_true (pending))
		1659	{
		1660	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1661	w_->pending = 0;
		1662	p->w = 0;
		1663	return p->events;
		1664	}
		1665	else
		1666	return 0;
		1667	}
		1668
		1669	void inline_size
		1670	pri_adjust (EV_P_ W w)
		1671	{
		1672	int pri = w->priority;
		1673	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1674	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1675	w->priority = pri;
		1676	}
		1677
		1678	void inline_speed
		1679	ev_start (EV_P_ W w, int active)
		1680	{
		1681	pri_adjust (EV_A_ w);
		1682	w->active = active;
		1683	ev_ref (EV_A);
		1684	}
		1685
		1686	void inline_size
		1687	ev_stop (EV_P_ W w)
		1688	{
		1689	ev_unref (EV_A);
		1690	w->active = 0;
		1691	}
		1692
		1693	/*****************************************************************************/
		1694
		1695	void noinline
		1696	ev_io_start (EV_P_ ev_io *w)
		1697	{
		1698	int fd = w->fd;
		1699
		1700	if (expect_false (ev_is_active (w)))
		1701	return;
		1702
		1703	assert (("ev_io_start called with negative fd", fd >= 0));
		1704
		1705	ev_start (EV_A_ (W)w, 1);
		1706	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1707	wlist_add (&anfds[fd].head, (WL)w);
		1708
		1709	fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
		1710	w->events &= ~EV_IOFDSET;
		1711	}
		1712
		1713	void noinline
		1714	ev_io_stop (EV_P_ ev_io *w)
		1715	{
		1716	clear_pending (EV_A_ (W)w);
		1717	if (expect_false (!ev_is_active (w)))
		1718	return;
		1719
		1720	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1721
		1722	wlist_del (&anfds[w->fd].head, (WL)w);
		1723	ev_stop (EV_A_ (W)w);
		1724
		1725	fd_change (EV_A_ w->fd, 1);
		1726	}
		1727
		1728	void noinline
		1729	ev_timer_start (EV_P_ ev_timer *w)
		1730	{
		1731	if (expect_false (ev_is_active (w)))
		1732	return;
		1733
		1734	((WT)w)->at += mn_now;
		1735
		1736	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1737
		1738	ev_start (EV_A_ (W)w, ++timercnt);
		1739	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1740	timers [timercnt - 1] = (WT)w;
		1741	upheap (timers, timercnt - 1);
		1742
		1743	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1744	}
		1745
		1746	void noinline
		1747	ev_timer_stop (EV_P_ ev_timer *w)
		1748	{
		1749	clear_pending (EV_A_ (W)w);
		1750	if (expect_false (!ev_is_active (w)))
		1751	return;
		1752
		1753	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1754
		1755	{
		1756	int active = ((W)w)->active;
		1757
		1758	if (expect_true (--active < --timercnt))
		1759	{
		1760	timers [active] = timers [timercnt];
		1761	adjustheap (timers, timercnt, active);
		1762	}
		1763	}
		1764
		1765	((WT)w)->at -= mn_now;
		1766
		1767	ev_stop (EV_A_ (W)w);
		1768	}
		1769
		1770	void noinline
		1771	ev_timer_again (EV_P_ ev_timer *w)
		1772	{
		1773	if (ev_is_active (w))
		1774	{
		1775	if (w->repeat)
		1776	{
		1777	((WT)w)->at = mn_now + w->repeat;
		1778	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1779	}
		1780	else
		1781	ev_timer_stop (EV_A_ w);
		1782	}
		1783	else if (w->repeat)
		1784	{
		1785	w->at = w->repeat;
		1786	ev_timer_start (EV_A_ w);
		1787	}
		1788	}
		1789
		1790	#if EV_PERIODIC_ENABLE
		1791	void noinline
		1792	ev_periodic_start (EV_P_ ev_periodic *w)
		1793	{
		1794	if (expect_false (ev_is_active (w)))
		1795	return;
		1796
		1797	if (w->reschedule_cb)
		1798	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1799	else if (w->interval)
		1800	{
		1801	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1802	/* this formula differs from the one in periodic_reify because we do not always round up */
		1803	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1804	}
		1805	else
		1806	((WT)w)->at = w->offset;
		1807
		1808	ev_start (EV_A_ (W)w, ++periodiccnt);
		1809	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
		1810	periodics [periodiccnt - 1] = (WT)w;
		1811	upheap (periodics, periodiccnt - 1);
		1812
		1813	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1814	}
		1815
		1816	void noinline
		1817	ev_periodic_stop (EV_P_ ev_periodic *w)
		1818	{
		1819	clear_pending (EV_A_ (W)w);
		1820	if (expect_false (!ev_is_active (w)))
		1821	return;
		1822
		1823	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1824
		1825	{
		1826	int active = ((W)w)->active;
		1827
		1828	if (expect_true (--active < --periodiccnt))
		1829	{
		1830	periodics [active] = periodics [periodiccnt];
		1831	adjustheap (periodics, periodiccnt, active);
		1832	}
		1833	}
		1834
		1835	ev_stop (EV_A_ (W)w);
		1836	}
		1837
		1838	void noinline
		1839	ev_periodic_again (EV_P_ ev_periodic *w)
		1840	{
		1841	/* TODO: use adjustheap and recalculation */
		1842	ev_periodic_stop (EV_A_ w);
		1843	ev_periodic_start (EV_A_ w);
		1844	}
		1845	#endif
		1846
		1847	#ifndef SA_RESTART
		1848	# define SA_RESTART 0
		1849	#endif
		1850
		1851	void noinline
		1852	ev_signal_start (EV_P_ ev_signal *w)
		1853	{
		1854	#if EV_MULTIPLICITY
		1855	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1856	#endif
		1857	if (expect_false (ev_is_active (w)))
		1858	return;
		1859
		1860	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1861
		1862	{
		1863	#ifndef _WIN32
		1864	sigset_t full, prev;
		1865	sigfillset (&full);
		1866	sigprocmask (SIG_SETMASK, &full, &prev);
		1867	#endif
		1868
		1869	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1870
		1871	#ifndef _WIN32
		1872	sigprocmask (SIG_SETMASK, &prev, 0);
		1873	#endif
		1874	}
		1875
		1876	ev_start (EV_A_ (W)w, 1);
		1877	wlist_add (&signals [w->signum - 1].head, (WL)w);
		1878
		1879	if (!((WL)w)->next)
		1880	{
		1881	#if _WIN32
		1882	signal (w->signum, sighandler);
		1883	#else
		1884	struct sigaction sa;
		1885	sa.sa_handler = sighandler;
		1886	sigfillset (&sa.sa_mask);
		1887	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1888	sigaction (w->signum, &sa, 0);
		1889	#endif
		1890	}
		1891	}
		1892
		1893	void noinline
		1894	ev_signal_stop (EV_P_ ev_signal *w)
		1895	{
		1896	clear_pending (EV_A_ (W)w);
		1897	if (expect_false (!ev_is_active (w)))
		1898	return;
		1899
		1900	wlist_del (&signals [w->signum - 1].head, (WL)w);
		1901	ev_stop (EV_A_ (W)w);
		1902
		1903	if (!signals [w->signum - 1].head)
		1904	signal (w->signum, SIG_DFL);
		1905	}
		1906
		1907	void
		1908	ev_child_start (EV_P_ ev_child *w)
		1909	{
		1910	#if EV_MULTIPLICITY
		1911	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1912	#endif
		1913	if (expect_false (ev_is_active (w)))
		1914	return;
		1915
		1916	ev_start (EV_A_ (W)w, 1);
		1917	wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1918	}
		1919
		1920	void
		1921	ev_child_stop (EV_P_ ev_child *w)
		1922	{
		1923	clear_pending (EV_A_ (W)w);
		1924	if (expect_false (!ev_is_active (w)))
		1925	return;
		1926
		1927	wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1928	ev_stop (EV_A_ (W)w);
		1929	}
		1930
		1931	#if EV_STAT_ENABLE
		1932
		1933	# ifdef _WIN32
		1934	# undef lstat
		1935	# define lstat(a,b) _stati64 (a,b)
		1936	# endif
		1937
		1938	#define DEF_STAT_INTERVAL 5.0074891
		1939	#define MIN_STAT_INTERVAL 0.1074891
		1940
		1941	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1942
		1943	#if EV_USE_INOTIFY
		1944	# define EV_INOTIFY_BUFSIZE 8192
		1945
		1946	static void noinline
		1947	infy_add (EV_P_ ev_stat *w)
		1948	{
		1949	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);
		1950
		1951	if (w->wd < 0)
		1952	{
		1953	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1954
		1955	/* monitor some parent directory for speedup hints */
		1956	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1957	{
		1958	char path [4096];
		1959	strcpy (path, w->path);
		1960
		1961	do
		1962	{
		1963	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1964	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1965
		1966	char *pend = strrchr (path, '/');
		1967
		1968	if (!pend)
		1969	break; /* whoops, no '/', complain to your admin */
		1970
		1971	*pend = 0;
		1972	w->wd = inotify_add_watch (fs_fd, path, mask);
		1973	}
		1974	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1975	}
		1976	}
		1977	else
		1978	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1979
		1980	if (w->wd >= 0)
		1981	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1982	}
		1983
		1984	static void noinline
		1985	infy_del (EV_P_ ev_stat *w)
		1986	{
		1987	int slot;
		1988	int wd = w->wd;
		1989
		1990	if (wd < 0)
		1991	return;
		1992
		1993	w->wd = -2;
		1994	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1995	wlist_del (&fs_hash [slot].head, (WL)w);
		1996
		1997	/* remove this watcher, if others are watching it, they will rearm */
		1998	inotify_rm_watch (fs_fd, wd);
		1999	}
		2000
		2001	static void noinline
		2002	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		2003	{
		2004	if (slot < 0)
		2005	/* overflow, need to check for all hahs slots */
		2006	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2007	infy_wd (EV_A_ slot, wd, ev);
		2008	else
		2009	{
		2010	WL w_;
		2011
		2012	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		2013	{
		2014	ev_stat *w = (ev_stat *)w_;
		2015	w_ = w_->next; /* lets us remove this watcher and all before it */
		2016
		2017	if (w->wd == wd || wd == -1)
		2018	{
		2019	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		2020	{
		2021	w->wd = -1;
		2022	infy_add (EV_A_ w); /* re-add, no matter what */
		2023	}
		2024
		2025	stat_timer_cb (EV_A_ &w->timer, 0);
		2026	}
		2027	}
		2028	}
		2029	}
		2030
337	static void	2031	static void
338	ev_start (struct ev_watcher *w, int active)	2032	infy_cb (EV_P_ ev_io *w, int revents)
339	{	2033	{
340	w->pending = 0;	2034	char buf [EV_INOTIFY_BUFSIZE];
341	w->active = active;	2035	struct inotify_event *ev = (struct inotify_event *)buf;
		2036	int ofs;
		2037	int len = read (fs_fd, buf, sizeof (buf));
		2038
		2039	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		2040	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		2041	}
		2042
		2043	void inline_size
		2044	infy_init (EV_P)
		2045	{
		2046	if (fs_fd != -2)
		2047	return;
		2048
		2049	fs_fd = inotify_init ();
		2050
		2051	if (fs_fd >= 0)
		2052	{
		2053	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		2054	ev_set_priority (&fs_w, EV_MAXPRI);
		2055	ev_io_start (EV_A_ &fs_w);
		2056	}
		2057	}
		2058
		2059	void inline_size
		2060	infy_fork (EV_P)
		2061	{
		2062	int slot;
		2063
		2064	if (fs_fd < 0)
		2065	return;
		2066
		2067	close (fs_fd);
		2068	fs_fd = inotify_init ();
		2069
		2070	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2071	{
		2072	WL w_ = fs_hash [slot].head;
		2073	fs_hash [slot].head = 0;
		2074
		2075	while (w_)
		2076	{
		2077	ev_stat *w = (ev_stat *)w_;
		2078	w_ = w_->next; /* lets us add this watcher */
		2079
		2080	w->wd = -1;
		2081
		2082	if (fs_fd >= 0)
		2083	infy_add (EV_A_ w); /* re-add, no matter what */
		2084	else
		2085	ev_timer_start (EV_A_ &w->timer);
		2086	}
		2087
		2088	}
		2089	}
		2090
		2091	#endif
		2092
		2093	void
		2094	ev_stat_stat (EV_P_ ev_stat *w)
		2095	{
		2096	if (lstat (w->path, &w->attr) < 0)
		2097	w->attr.st_nlink = 0;
		2098	else if (!w->attr.st_nlink)
		2099	w->attr.st_nlink = 1;
		2100	}
		2101
		2102	static void noinline
		2103	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		2104	{
		2105	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2106
		2107	/* we copy this here each the time so that */
		2108	/* prev has the old value when the callback gets invoked */
		2109	w->prev = w->attr;
		2110	ev_stat_stat (EV_A_ w);
		2111
		2112	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2113	if (
		2114	w->prev.st_dev != w->attr.st_dev
		2115	|| w->prev.st_ino != w->attr.st_ino
		2116	|| w->prev.st_mode != w->attr.st_mode
		2117	|| w->prev.st_nlink != w->attr.st_nlink
		2118	|| w->prev.st_uid != w->attr.st_uid
		2119	|| w->prev.st_gid != w->attr.st_gid
		2120	|| w->prev.st_rdev != w->attr.st_rdev
		2121	|| w->prev.st_size != w->attr.st_size
		2122	|| w->prev.st_atime != w->attr.st_atime
		2123	|| w->prev.st_mtime != w->attr.st_mtime
		2124	|| w->prev.st_ctime != w->attr.st_ctime
		2125	) {
		2126	#if EV_USE_INOTIFY
		2127	infy_del (EV_A_ w);
		2128	infy_add (EV_A_ w);
		2129	ev_stat_stat (EV_A_ w); /* avoid race... */
		2130	#endif
		2131
		2132	ev_feed_event (EV_A_ w, EV_STAT);
		2133	}
		2134	}
		2135
		2136	void
		2137	ev_stat_start (EV_P_ ev_stat *w)
		2138	{
		2139	if (expect_false (ev_is_active (w)))
		2140	return;
		2141
		2142	/* since we use memcmp, we need to clear any padding data etc. */
		2143	memset (&w->prev, 0, sizeof (ev_statdata));
		2144	memset (&w->attr, 0, sizeof (ev_statdata));
		2145
		2146	ev_stat_stat (EV_A_ w);
		2147
		2148	if (w->interval < MIN_STAT_INTERVAL)
		2149	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2150
		2151	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2152	ev_set_priority (&w->timer, ev_priority (w));
		2153
		2154	#if EV_USE_INOTIFY
		2155	infy_init (EV_A);
		2156
		2157	if (fs_fd >= 0)
		2158	infy_add (EV_A_ w);
		2159	else
		2160	#endif
		2161	ev_timer_start (EV_A_ &w->timer);
		2162
		2163	ev_start (EV_A_ (W)w, 1);
		2164	}
		2165
		2166	void
		2167	ev_stat_stop (EV_P_ ev_stat *w)
		2168	{
		2169	clear_pending (EV_A_ (W)w);
		2170	if (expect_false (!ev_is_active (w)))
		2171	return;
		2172
		2173	#if EV_USE_INOTIFY
		2174	infy_del (EV_A_ w);
		2175	#endif
		2176	ev_timer_stop (EV_A_ &w->timer);
		2177
		2178	ev_stop (EV_A_ (W)w);
		2179	}
		2180	#endif
		2181
		2182	#if EV_IDLE_ENABLE
		2183	void
		2184	ev_idle_start (EV_P_ ev_idle *w)
		2185	{
		2186	if (expect_false (ev_is_active (w)))
		2187	return;
		2188
		2189	pri_adjust (EV_A_ (W)w);
		2190
		2191	{
		2192	int active = ++idlecnt [ABSPRI (w)];
		2193
		2194	++idleall;
		2195	ev_start (EV_A_ (W)w, active);
		2196
		2197	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2198	idles [ABSPRI (w)][active - 1] = w;
		2199	}
		2200	}
		2201
		2202	void
		2203	ev_idle_stop (EV_P_ ev_idle *w)
		2204	{
		2205	clear_pending (EV_A_ (W)w);
		2206	if (expect_false (!ev_is_active (w)))
		2207	return;
		2208
		2209	{
		2210	int active = ((W)w)->active;
		2211
		2212	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2213	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2214
		2215	ev_stop (EV_A_ (W)w);
		2216	--idleall;
		2217	}
		2218	}
		2219	#endif
		2220
		2221	void
		2222	ev_prepare_start (EV_P_ ev_prepare *w)
		2223	{
		2224	if (expect_false (ev_is_active (w)))
		2225	return;
		2226
		2227	ev_start (EV_A_ (W)w, ++preparecnt);
		2228	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2229	prepares [preparecnt - 1] = w;
		2230	}
		2231
		2232	void
		2233	ev_prepare_stop (EV_P_ ev_prepare *w)
		2234	{
		2235	clear_pending (EV_A_ (W)w);
		2236	if (expect_false (!ev_is_active (w)))
		2237	return;
		2238
		2239	{
		2240	int active = ((W)w)->active;
		2241	prepares [active - 1] = prepares [--preparecnt];
		2242	((W)prepares [active - 1])->active = active;
		2243	}
		2244
		2245	ev_stop (EV_A_ (W)w);
		2246	}
		2247
		2248	void
		2249	ev_check_start (EV_P_ ev_check *w)
		2250	{
		2251	if (expect_false (ev_is_active (w)))
		2252	return;
		2253
		2254	ev_start (EV_A_ (W)w, ++checkcnt);
		2255	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2256	checks [checkcnt - 1] = w;
		2257	}
		2258
		2259	void
		2260	ev_check_stop (EV_P_ ev_check *w)
		2261	{
		2262	clear_pending (EV_A_ (W)w);
		2263	if (expect_false (!ev_is_active (w)))
		2264	return;
		2265
		2266	{
		2267	int active = ((W)w)->active;
		2268	checks [active - 1] = checks [--checkcnt];
		2269	((W)checks [active - 1])->active = active;
		2270	}
		2271
		2272	ev_stop (EV_A_ (W)w);
		2273	}
		2274
		2275	#if EV_EMBED_ENABLE
		2276	void noinline
		2277	ev_embed_sweep (EV_P_ ev_embed *w)
		2278	{
		2279	ev_loop (w->other, EVLOOP_NONBLOCK);
342	}	2280	}
343		2281
344	static void	2282	static void
345	ev_stop (struct ev_watcher *w)	2283	embed_io_cb (EV_P_ ev_io *io, int revents)
346	{	2284	{
347	if (w->pending)	2285	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
348	pendings [w->pending - 1].w = 0;
349		2286
350	w->active = 0;
351	/* nop */
352	}
353
354	void
355	evio_start (struct ev_io *w)
356	{
357	if (ev_is_active (w))	2287	if (ev_cb (w))
358	return;	2288	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	2289	else
398	w->at += ev_now;	2290	ev_loop (w->other, EVLOOP_NONBLOCK);
399
400	ev_start ((struct ev_watcher *)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);
404	}	2291	}
405		2292
406	void	2293	static void
407	evtimer_stop (struct ev_timer *w)	2294	embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
408	{	2295	{
409	if (!ev_is_active (w))	2296	ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
410	return;
411		2297
412	if (w->active < timercnt--)	2298	{
		2299	struct ev_loop *loop = w->other;
		2300
		2301	while (fdchangecnt)
413	{	2302	{
414	timers [w->active - 1] = timers [timercnt];	2303	fd_reify (EV_A);
415	downheap (w->active - 1);	2304	ev_loop (EV_A_ EVLOOP_NONBLOCK);
416	}	2305	}
417		2306	}
418	ev_stop ((struct ev_watcher *)w);
419	}	2307	}
420		2308
421	void	2309	#if 0
422	evsignal_start (struct ev_signal *w)	2310	static void
		2311	embed_idle_cb (EV_P_ ev_idle *idle, int revents)
423	{	2312	{
		2313	ev_idle_stop (EV_A_ idle);
		2314	}
		2315	#endif
		2316
		2317	void
		2318	ev_embed_start (EV_P_ ev_embed *w)
		2319	{
424	if (ev_is_active (w))	2320	if (expect_false (ev_is_active (w)))
425	return;	2321	return;
426		2322
427	ev_start ((struct ev_watcher *)w, 1);	2323	{
428	array_needsize (signals, signalmax, w->signum, signals_init);	2324	struct ev_loop *loop = w->other;
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2325	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
430	}	2326	ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
		2327	}
431		2328
		2329	ev_set_priority (&w->io, ev_priority (w));
		2330	ev_io_start (EV_A_ &w->io);
		2331
		2332	ev_prepare_init (&w->prepare, embed_prepare_cb);
		2333	ev_set_priority (&w->prepare, EV_MINPRI);
		2334	ev_prepare_start (EV_A_ &w->prepare);
		2335
		2336	/*ev_idle_init (&w->idle, e,bed_idle_cb);*/
		2337
		2338	ev_start (EV_A_ (W)w, 1);
		2339	}
		2340
432	void	2341	void
433	evsignal_stop (struct ev_signal *w)	2342	ev_embed_stop (EV_P_ ev_embed *w)
434	{	2343	{
		2344	clear_pending (EV_A_ (W)w);
435	if (!ev_is_active (w))	2345	if (expect_false (!ev_is_active (w)))
436	return;	2346	return;
437		2347
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2348	ev_io_stop (EV_A_ &w->io);
439	ev_stop ((struct ev_watcher *)w);	2349	ev_prepare_stop (EV_A_ &w->prepare);
		2350
		2351	ev_stop (EV_A_ (W)w);
440	}	2352	}
		2353	#endif
		2354
		2355	#if EV_FORK_ENABLE
		2356	void
		2357	ev_fork_start (EV_P_ ev_fork *w)
		2358	{
		2359	if (expect_false (ev_is_active (w)))
		2360	return;
		2361
		2362	ev_start (EV_A_ (W)w, ++forkcnt);
		2363	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2364	forks [forkcnt - 1] = w;
		2365	}
		2366
		2367	void
		2368	ev_fork_stop (EV_P_ ev_fork *w)
		2369	{
		2370	clear_pending (EV_A_ (W)w);
		2371	if (expect_false (!ev_is_active (w)))
		2372	return;
		2373
		2374	{
		2375	int active = ((W)w)->active;
		2376	forks [active - 1] = forks [--forkcnt];
		2377	((W)forks [active - 1])->active = active;
		2378	}
		2379
		2380	ev_stop (EV_A_ (W)w);
		2381	}
		2382	#endif
441		2383
442	/*****************************************************************************/	2384	/*****************************************************************************/
443	#if 1	2385
		2386	struct ev_once
		2387	{
		2388	ev_io io;
		2389	ev_timer to;
		2390	void (*cb)(int revents, void *arg);
		2391	void *arg;
		2392	};
444		2393
445	static void	2394	static void
446	sin_cb (struct ev_io *w, int revents)	2395	once_cb (EV_P_ struct ev_once *once, int revents)
447	{	2396	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2397	void (*cb)(int revents, void *arg) = once->cb;
		2398	void *arg = once->arg;
		2399
		2400	ev_io_stop (EV_A_ &once->io);
		2401	ev_timer_stop (EV_A_ &once->to);
		2402	ev_free (once);
		2403
		2404	cb (revents, arg);
449	}	2405	}
450		2406
451	static void	2407	static void
		2408	once_cb_io (EV_P_ ev_io *w, int revents)
		2409	{
		2410	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2411	}
		2412
		2413	static void
452	ocb (struct ev_timer *w, int revents)	2414	once_cb_to (EV_P_ ev_timer *w, int revents)
453	{	2415	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2416	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
455	}	2417	}
456		2418
457	int main (void)	2419	void
		2420	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
458	{	2421	{
459	struct ev_io sin;	2422	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
460		2423
461	ev_init (0);	2424	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	}	2425	{
479		2426	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
480	ev_loop (0);
481
482	return 0;	2427	return;
483	}	2428	}
484		2429
485	#endif	2430	once->cb = cb;
		2431	once->arg = arg;
486		2432
		2433	ev_init (&once->io, once_cb_io);
		2434	if (fd >= 0)
		2435	{
		2436	ev_io_set (&once->io, fd, events);
		2437	ev_io_start (EV_A_ &once->io);
		2438	}
487		2439
		2440	ev_init (&once->to, once_cb_to);
		2441	if (timeout >= 0.)
		2442	{
		2443	ev_timer_set (&once->to, timeout, 0.);
		2444	ev_timer_start (EV_A_ &once->to);
		2445	}
		2446	}
488		2447
		2448	#if EV_MULTIPLICITY
		2449	#include "ev_wrap.h"
		2450	#endif
489		2451
		2452	#ifdef __cplusplus
		2453	}
		2454	#endif
		2455

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