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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.178 by root, Tue Dec 11 18:36:11 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# ifdef EV_CONFIG_H
		38	# include EV_CONFIG_H
		39	# else
		40	# include "config.h"
		41	# endif
		42
		43	# if HAVE_CLOCK_GETTIME
		44	# ifndef EV_USE_MONOTONIC
		45	# define EV_USE_MONOTONIC 1
		46	# endif
		47	# ifndef EV_USE_REALTIME
		48	# define EV_USE_REALTIME 1
		49	# endif
		50	# else
		51	# ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 0
		53	# endif
		54	# ifndef EV_USE_REALTIME
		55	# define EV_USE_REALTIME 0
		56	# endif
		57	# endif
		58
		59	# ifndef EV_USE_SELECT
		60	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		61	# define EV_USE_SELECT 1
		62	# else
		63	# define EV_USE_SELECT 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_POLL
		68	# if HAVE_POLL && HAVE_POLL_H
		69	# define EV_USE_POLL 1
		70	# else
		71	# define EV_USE_POLL 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_EPOLL
		76	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		77	# define EV_USE_EPOLL 1
		78	# else
		79	# define EV_USE_EPOLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_KQUEUE
		84	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		85	# define EV_USE_KQUEUE 1
		86	# else
		87	# define EV_USE_KQUEUE 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_PORT
		92	# if HAVE_PORT_H && HAVE_PORT_CREATE
		93	# define EV_USE_PORT 1
		94	# else
		95	# define EV_USE_PORT 0
		96	# endif
		97	# endif
		98
		99	# ifndef EV_USE_INOTIFY
		100	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		101	# define EV_USE_INOTIFY 1
		102	# else
		103	# define EV_USE_INOTIFY 0
		104	# endif
		105	# endif
		106
		107	#endif
		108
1	#include <math.h>	109	#include <math.h>
2	#include <stdlib.h>	110	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	111	#include <fcntl.h>
5	#include <signal.h>	112	#include <stddef.h>
6		113
7	#include <stdio.h>	114	#include <stdio.h>
8		115
9	#include <assert.h>	116	#include <assert.h>
10	#include <errno.h>	117	#include <errno.h>
11	#include <sys/time.h>	118	#include <sys/types.h>
12	#include <time.h>	119	#include <time.h>
13		120
		121	#include <signal.h>
		122
		123	#ifdef EV_H
		124	# include EV_H
		125	#else
		126	# include "ev.h"
		127	#endif
		128
		129	#ifndef _WIN32
		130	# include <sys/time.h>
		131	# include <sys/wait.h>
		132	# include <unistd.h>
		133	#else
		134	# define WIN32_LEAN_AND_MEAN
		135	# include <windows.h>
		136	# ifndef EV_SELECT_IS_WINSOCKET
		137	# define EV_SELECT_IS_WINSOCKET 1
		138	# endif
		139	#endif
		140
		141	/**/
		142
		143	#ifndef EV_USE_MONOTONIC
		144	# define EV_USE_MONOTONIC 0
		145	#endif
		146
		147	#ifndef EV_USE_REALTIME
		148	# define EV_USE_REALTIME 0
		149	#endif
		150
		151	#ifndef EV_USE_SELECT
		152	# define EV_USE_SELECT 1
		153	#endif
		154
		155	#ifndef EV_USE_POLL
		156	# ifdef _WIN32
		157	# define EV_USE_POLL 0
		158	# else
		159	# define EV_USE_POLL 1
		160	# endif
		161	#endif
		162
		163	#ifndef EV_USE_EPOLL
		164	# define EV_USE_EPOLL 0
		165	#endif
		166
		167	#ifndef EV_USE_KQUEUE
		168	# define EV_USE_KQUEUE 0
		169	#endif
		170
		171	#ifndef EV_USE_PORT
		172	# define EV_USE_PORT 0
		173	#endif
		174
		175	#ifndef EV_USE_INOTIFY
		176	# define EV_USE_INOTIFY 0
		177	#endif
		178
		179	#ifndef EV_PID_HASHSIZE
		180	# if EV_MINIMAL
		181	# define EV_PID_HASHSIZE 1
		182	# else
		183	# define EV_PID_HASHSIZE 16
		184	# endif
		185	#endif
		186
		187	#ifndef EV_INOTIFY_HASHSIZE
		188	# if EV_MINIMAL
		189	# define EV_INOTIFY_HASHSIZE 1
		190	# else
		191	# define EV_INOTIFY_HASHSIZE 16
		192	# endif
		193	#endif
		194
		195	/**/
		196
14	#ifdef CLOCK_MONOTONIC	197	#ifndef CLOCK_MONOTONIC
		198	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	199	# define EV_USE_MONOTONIC 0
16	#endif	200	#endif
17		201
		202	#ifndef CLOCK_REALTIME
		203	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	204	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	205	#endif
20	#define HAVE_SELECT 1	206
		207	#if EV_SELECT_IS_WINSOCKET
		208	# include <winsock.h>
		209	#endif
		210
		211	#if !EV_STAT_ENABLE
		212	# define EV_USE_INOTIFY 0
		213	#endif
		214
		215	#if EV_USE_INOTIFY
		216	# include <sys/inotify.h>
		217	#endif
		218
		219	/**/
		220
		221	/*
		222	* This is used to avoid floating point rounding problems.
		223	* It is added to ev_rt_now when scheduling periodics
		224	* to ensure progress, time-wise, even when rounding
		225	* errors are against us.
		226	* This value is good at least till the year 4000.
		227	* Better solutions welcome.
		228	*/
		229	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
21		230
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	231	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	232	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		233	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
24		234
		235	#if __GNUC__ >= 3
		236	# define expect(expr,value) __builtin_expect ((expr),(value))
		237	# define noinline __attribute__ ((noinline))
		238	#else
		239	# define expect(expr,value) (expr)
		240	# define noinline
		241	# if __STDC_VERSION__ < 199901L
		242	# define inline
		243	# endif
		244	#endif
		245
		246	#define expect_false(expr) expect ((expr) != 0, 0)
		247	#define expect_true(expr) expect ((expr) != 0, 1)
		248	#define inline_size static inline
		249
		250	#if EV_MINIMAL
		251	# define inline_speed static noinline
		252	#else
		253	# define inline_speed static inline
		254	#endif
		255
		256	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		257	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		258
		259	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		260	#define EMPTY2(a,b) /* used to suppress some warnings */
		261
		262	typedef ev_watcher *W;
		263	typedef ev_watcher_list *WL;
		264	typedef ev_watcher_time *WT;
		265
		266	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		267
		268	#ifdef _WIN32
		269	# include "ev_win32.c"
		270	#endif
		271
		272	/*****************************************************************************/
		273
		274	static void (*syserr_cb)(const char *msg);
		275
		276	void
		277	ev_set_syserr_cb (void (*cb)(const char *msg))
		278	{
		279	syserr_cb = cb;
		280	}
		281
		282	static void noinline
		283	syserr (const char *msg)
		284	{
		285	if (!msg)
		286	msg = "(libev) system error";
		287
		288	if (syserr_cb)
		289	syserr_cb (msg);
		290	else
		291	{
		292	perror (msg);
		293	abort ();
		294	}
		295	}
		296
		297	static void *(*alloc)(void *ptr, long size);
		298
		299	void
		300	ev_set_allocator (void *(*cb)(void *ptr, long size))
		301	{
		302	alloc = cb;
		303	}
		304
		305	inline_speed void *
		306	ev_realloc (void *ptr, long size)
		307	{
		308	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		309
		310	if (!ptr && size)
		311	{
		312	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		313	abort ();
		314	}
		315
		316	return ptr;
		317	}
		318
		319	#define ev_malloc(size) ev_realloc (0, (size))
		320	#define ev_free(ptr) ev_realloc ((ptr), 0)
		321
		322	/*****************************************************************************/
		323
		324	typedef struct
		325	{
		326	WL head;
		327	unsigned char events;
		328	unsigned char reify;
		329	#if EV_SELECT_IS_WINSOCKET
		330	SOCKET handle;
		331	#endif
		332	} ANFD;
		333
		334	typedef struct
		335	{
		336	W w;
		337	int events;
		338	} ANPENDING;
		339
		340	#if EV_USE_INOTIFY
		341	typedef struct
		342	{
		343	WL head;
		344	} ANFS;
		345	#endif
		346
		347	#if EV_MULTIPLICITY
		348
		349	struct ev_loop
		350	{
		351	ev_tstamp ev_rt_now;
		352	#define ev_rt_now ((loop)->ev_rt_now)
		353	#define VAR(name,decl) decl;
		354	#include "ev_vars.h"
		355	#undef VAR
		356	};
25	#include "ev.h"	357	#include "ev_wrap.h"
26		358
27	struct ev_watcher {	359	static struct ev_loop default_loop_struct;
28	EV_WATCHER (ev_watcher);	360	struct ev_loop *ev_default_loop_ptr;
29	};
30		361
31	struct ev_watcher_list {	362	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		363
35	static ev_tstamp now, diff; /* monotonic clock */
36	ev_tstamp ev_now;	364	ev_tstamp ev_rt_now;
37	int ev_method;	365	#define VAR(name,decl) static decl;
		366	#include "ev_vars.h"
		367	#undef VAR
38		368
39	static int have_monotonic; /* runtime */	369	static int ev_default_loop_ptr;
40		370
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	371	#endif
42	static void (*method_modify)(int fd, int oev, int nev);	372
43	static void (*method_poll)(ev_tstamp timeout);	373	/*****************************************************************************/
44		374
45	ev_tstamp	375	ev_tstamp
46	ev_time (void)	376	ev_time (void)
47	{	377	{
48	#if HAVE_REALTIME	378	#if EV_USE_REALTIME
49	struct timespec ts;	379	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	380	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	381	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	382	#else
53	struct timeval tv;	383	struct timeval tv;
54	gettimeofday (&tv, 0);	384	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	385	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	386	#endif
57	}	387	}
58		388
59	static ev_tstamp	389	ev_tstamp inline_size
60	get_clock (void)	390	get_clock (void)
61	{	391	{
62	#if HAVE_MONOTONIC	392	#if EV_USE_MONOTONIC
63	if (have_monotonic)	393	if (expect_true (have_monotonic))
64	{	394	{
65	struct timespec ts;	395	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	396	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	397	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	398	}
69	#endif	399	#endif
70		400
71	return ev_time ();	401	return ev_time ();
72	}	402	}
73		403
		404	#if EV_MULTIPLICITY
		405	ev_tstamp
		406	ev_now (EV_P)
		407	{
		408	return ev_rt_now;
		409	}
		410	#endif
		411
		412	int inline_size
		413	array_nextsize (int elem, int cur, int cnt)
		414	{
		415	int ncur = cur + 1;
		416
		417	do
		418	ncur <<= 1;
		419	while (cnt > ncur);
		420
		421	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		422	if (elem * ncur > 4096)
		423	{
		424	ncur *= elem;
		425	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		426	ncur = ncur - sizeof (void *) * 4;
		427	ncur /= elem;
		428	}
		429
		430	return ncur;
		431	}
		432
		433	static noinline void *
		434	array_realloc (int elem, void *base, int *cur, int cnt)
		435	{
		436	*cur = array_nextsize (elem, *cur, cnt);
		437	return ev_realloc (base, elem * *cur);
		438	}
		439
74	#define array_needsize(base,cur,cnt,init) \	440	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	441	if (expect_false ((cnt) > (cur))) \
76	{ \	442	{ \
77	int newcnt = cur ? cur << 1 : 16; \	443	int ocur_ = (cur); \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	444	(base) = (type *)array_realloc \
79	base = realloc (base, sizeof (*base) * (newcnt)); \	445	(sizeof (type), (base), &(cur), (cnt)); \
80	init (base + cur, newcnt - cur); \	446	init ((base) + (ocur_), (cur) - ocur_); \
81	cur = newcnt; \	447	}
		448
		449	#if 0
		450	#define array_slim(type,stem) \
		451	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		452	{ \
		453	stem ## max = array_roundsize (stem ## cnt >> 1); \
		454	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		455	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		456	}
		457	#endif
		458
		459	#define array_free(stem, idx) \
		460	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		461
		462	/*****************************************************************************/
		463
		464	void noinline
		465	ev_feed_event (EV_P_ void *w, int revents)
		466	{
		467	W w_ = (W)w;
		468	int pri = ABSPRI (w_);
		469
		470	if (expect_false (w_->pending))
		471	pendings [pri][w_->pending - 1].events |= revents;
		472	else
		473	{
		474	w_->pending = ++pendingcnt [pri];
		475	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		476	pendings [pri][w_->pending - 1].w = w_;
		477	pendings [pri][w_->pending - 1].events = revents;
		478	}
		479	}
		480
		481	void inline_size
		482	queue_events (EV_P_ W *events, int eventcnt, int type)
		483	{
		484	int i;
		485
		486	for (i = 0; i < eventcnt; ++i)
		487	ev_feed_event (EV_A_ events [i], type);
		488	}
		489
		490	/*****************************************************************************/
		491
		492	void inline_size
		493	anfds_init (ANFD *base, int count)
		494	{
		495	while (count--)
		496	{
		497	base->head = 0;
		498	base->events = EV_NONE;
		499	base->reify = 0;
		500
		501	++base;
		502	}
		503	}
		504
		505	void inline_speed
		506	fd_event (EV_P_ int fd, int revents)
		507	{
		508	ANFD *anfd = anfds + fd;
		509	ev_io *w;
		510
		511	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		512	{
		513	int ev = w->events & revents;
		514
		515	if (ev)
		516	ev_feed_event (EV_A_ (W)w, ev);
		517	}
		518	}
		519
		520	void
		521	ev_feed_fd_event (EV_P_ int fd, int revents)
		522	{
		523	if (fd >= 0 && fd < anfdmax)
		524	fd_event (EV_A_ fd, revents);
		525	}
		526
		527	void inline_size
		528	fd_reify (EV_P)
		529	{
		530	int i;
		531
		532	for (i = 0; i < fdchangecnt; ++i)
		533	{
		534	int fd = fdchanges [i];
		535	ANFD *anfd = anfds + fd;
		536	ev_io *w;
		537
		538	int events = 0;
		539
		540	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		541	events |= w->events;
		542
		543	#if EV_SELECT_IS_WINSOCKET
		544	if (events)
		545	{
		546	unsigned long argp;
		547	anfd->handle = _get_osfhandle (fd);
		548	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		549	}
		550	#endif
		551
		552	anfd->reify = 0;
		553
		554	backend_modify (EV_A_ fd, anfd->events, events);
		555	anfd->events = events;
		556	}
		557
		558	fdchangecnt = 0;
		559	}
		560
		561	void inline_size
		562	fd_change (EV_P_ int fd)
		563	{
		564	if (expect_false (anfds [fd].reify))
		565	return;
		566
		567	anfds [fd].reify = 1;
		568
		569	++fdchangecnt;
		570	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		571	fdchanges [fdchangecnt - 1] = fd;
		572	}
		573
		574	void inline_speed
		575	fd_kill (EV_P_ int fd)
		576	{
		577	ev_io *w;
		578
		579	while ((w = (ev_io *)anfds [fd].head))
		580	{
		581	ev_io_stop (EV_A_ w);
		582	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		583	}
		584	}
		585
		586	int inline_size
		587	fd_valid (int fd)
		588	{
		589	#ifdef _WIN32
		590	return _get_osfhandle (fd) != -1;
		591	#else
		592	return fcntl (fd, F_GETFD) != -1;
		593	#endif
		594	}
		595
		596	/* called on EBADF to verify fds */
		597	static void noinline
		598	fd_ebadf (EV_P)
		599	{
		600	int fd;
		601
		602	for (fd = 0; fd < anfdmax; ++fd)
		603	if (anfds [fd].events)
		604	if (!fd_valid (fd) == -1 && errno == EBADF)
		605	fd_kill (EV_A_ fd);
		606	}
		607
		608	/* called on ENOMEM in select/poll to kill some fds and retry */
		609	static void noinline
		610	fd_enomem (EV_P)
		611	{
		612	int fd;
		613
		614	for (fd = anfdmax; fd--; )
		615	if (anfds [fd].events)
		616	{
		617	fd_kill (EV_A_ fd);
		618	return;
82	}	619	}
		620	}
		621
		622	/* usually called after fork if backend needs to re-arm all fds from scratch */
		623	static void noinline
		624	fd_rearm_all (EV_P)
		625	{
		626	int fd;
		627
		628	for (fd = 0; fd < anfdmax; ++fd)
		629	if (anfds [fd].events)
		630	{
		631	anfds [fd].events = 0;
		632	fd_change (EV_A_ fd);
		633	}
		634	}
		635
		636	/*****************************************************************************/
		637
		638	void inline_speed
		639	upheap (WT *heap, int k)
		640	{
		641	WT w = heap [k];
		642
		643	while (k && heap [k >> 1]->at > w->at)
		644	{
		645	heap [k] = heap [k >> 1];
		646	((W)heap [k])->active = k + 1;
		647	k >>= 1;
		648	}
		649
		650	heap [k] = w;
		651	((W)heap [k])->active = k + 1;
		652
		653	}
		654
		655	void inline_speed
		656	downheap (WT *heap, int N, int k)
		657	{
		658	WT w = heap [k];
		659
		660	while (k < (N >> 1))
		661	{
		662	int j = k << 1;
		663
		664	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		665	++j;
		666
		667	if (w->at <= heap [j]->at)
		668	break;
		669
		670	heap [k] = heap [j];
		671	((W)heap [k])->active = k + 1;
		672	k = j;
		673	}
		674
		675	heap [k] = w;
		676	((W)heap [k])->active = k + 1;
		677	}
		678
		679	void inline_size
		680	adjustheap (WT *heap, int N, int k)
		681	{
		682	upheap (heap, k);
		683	downheap (heap, N, k);
		684	}
		685
		686	/*****************************************************************************/
83		687
84	typedef struct	688	typedef struct
85	{	689	{
86	struct ev_io *head;	690	WL head;
87	unsigned char wev, rev; /* want, received event set */
88	} ANFD;
89
90	static ANFD *anfds;
91	static int anfdmax;
92
93	static int *fdchanges;
94	static int fdchangemax, fdchangecnt;
95
96	static void
97	anfds_init (ANFD *base, int count)
98	{
99	while (count--)
100	{
101	base->head = 0;
102	base->wev = base->rev = EV_NONE;
103	++base;
104	}
105	}
106
107	typedef struct
108	{
109	struct ev_watcher *w;
110	int events;
111	} ANPENDING;
112
113	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;
115
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;
120	array_needsize (pendings, pendingmax, pendingcnt, );
121	pendings [pendingcnt - 1].w = w;
122	pendings [pendingcnt - 1].events = events;
123	}
124
125	static void
126	fd_event (int fd, int events)
127	{
128	ANFD *anfd = anfds + fd;
129	struct ev_io *w;
130
131	for (w = anfd->head; w; w = w->next)
132	{
133	int ev = w->events & events;
134
135	if (ev)
136	event ((struct ev_watcher *)w, ev);
137	}
138	}
139
140	static struct ev_timer **atimers;
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void
147	upheap (struct ev_timer **timers, int k)
148	{
149	struct ev_timer *w = timers [k];
150
151	while (k && timers [k >> 1]->at > w->at)
152	{
153	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;
155	k >>= 1;
156	}
157
158	timers [k] = w;
159	timers [k]->active = k + 1;
160
161	}
162
163	static void
164	downheap (struct ev_timer **timers, int N, int k)
165	{
166	struct ev_timer *w = timers [k];
167
168	while (k < (N >> 1))
169	{
170	int j = k << 1;
171
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173	++j;
174
175	if (w->at <= timers [j]->at)
176	break;
177
178	timers [k] = timers [j];
179	timers [k]->active = k + 1;
180	k = j;
181	}
182
183	timers [k] = w;
184	timers [k]->active = k + 1;
185	}
186
187	typedef struct
188	{
189	struct ev_signal *head;
190	sig_atomic_t gotsig;	691	sig_atomic_t volatile gotsig;
191	} ANSIG;	692	} ANSIG;
192		693
193	static ANSIG *signals;	694	static ANSIG *signals;
194	static int signalmax;	695	static int signalmax;
195		696
196	static int sigpipe [2];	697	static int sigpipe [2];
197	static sig_atomic_t gotsig;	698	static sig_atomic_t volatile gotsig;
198	static struct ev_io sigev;	699	static ev_io sigev;
199		700
200	static void	701	void inline_size
201	signals_init (ANSIG *base, int count)	702	signals_init (ANSIG *base, int count)
202	{	703	{
203	while (count--)	704	while (count--)
204	{	705	{
205	base->head = 0;	706	base->head = 0;
206	base->gotsig = 0;	707	base->gotsig = 0;
		708
207	++base;	709	++base;
208	}	710	}
209	}	711	}
210		712
211	static void	713	static void
212	sighandler (int signum)	714	sighandler (int signum)
213	{	715	{
		716	#if _WIN32
		717	signal (signum, sighandler);
		718	#endif
		719
214	signals [signum - 1].gotsig = 1;	720	signals [signum - 1].gotsig = 1;
215		721
216	if (!gotsig)	722	if (!gotsig)
217	{	723	{
		724	int old_errno = errno;
218	gotsig = 1;	725	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);	726	write (sigpipe [1], &signum, 1);
		727	errno = old_errno;
220	}	728	}
		729	}
		730
		731	void noinline
		732	ev_feed_signal_event (EV_P_ int signum)
		733	{
		734	WL w;
		735
		736	#if EV_MULTIPLICITY
		737	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		738	#endif
		739
		740	--signum;
		741
		742	if (signum < 0 || signum >= signalmax)
		743	return;
		744
		745	signals [signum].gotsig = 0;
		746
		747	for (w = signals [signum].head; w; w = w->next)
		748	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
221	}	749	}
222		750
223	static void	751	static void
224	sigcb (struct ev_io *iow, int revents)	752	sigcb (EV_P_ ev_io *iow, int revents)
225	{	753	{
226	struct ev_signal *w;
227	int sig;	754	int signum;
228		755
		756	read (sigpipe [0], &revents, 1);
229	gotsig = 0;	757	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231		758
232	for (sig = signalmax; sig--; )	759	for (signum = signalmax; signum--; )
233	if (signals [sig].gotsig)	760	if (signals [signum].gotsig)
		761	ev_feed_signal_event (EV_A_ signum + 1);
		762	}
		763
		764	void inline_speed
		765	fd_intern (int fd)
		766	{
		767	#ifdef _WIN32
		768	int arg = 1;
		769	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		770	#else
		771	fcntl (fd, F_SETFD, FD_CLOEXEC);
		772	fcntl (fd, F_SETFL, O_NONBLOCK);
		773	#endif
		774	}
		775
		776	static void noinline
		777	siginit (EV_P)
		778	{
		779	fd_intern (sigpipe [0]);
		780	fd_intern (sigpipe [1]);
		781
		782	ev_io_set (&sigev, sigpipe [0], EV_READ);
		783	ev_io_start (EV_A_ &sigev);
		784	ev_unref (EV_A); /* child watcher should not keep loop alive */
		785	}
		786
		787	/*****************************************************************************/
		788
		789	static ev_child *childs [EV_PID_HASHSIZE];
		790
		791	#ifndef _WIN32
		792
		793	static ev_signal childev;
		794
		795	void inline_speed
		796	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		797	{
		798	ev_child *w;
		799
		800	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		801	if (w->pid == pid || !w->pid)
234	{	802	{
235	signals [sig].gotsig = 0;	803	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
236		804	w->rpid = pid;
237	for (w = signals [sig].head; w; w = w->next)	805	w->rstatus = status;
238	event ((struct ev_watcher *)w, EV_SIGNAL);	806	ev_feed_event (EV_A_ (W)w, EV_CHILD);
239	}	807	}
240	}	808	}
241		809
		810	#ifndef WCONTINUED
		811	# define WCONTINUED 0
		812	#endif
		813
242	static void	814	static void
243	siginit (void)	815	childcb (EV_P_ ev_signal *sw, int revents)
244	{	816	{
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	817	int pid, status;
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247		818
248	/* rather than sort out wether we really need nb, set it */	819	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	820	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	821	if (!WCONTINUED
		822	|| errno != EINVAL
		823	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		824	return;
251		825
252	evio_set (&sigev, sigpipe [0], EV_READ);	826	/* make sure we are called again until all childs have been reaped */
253	evio_start (&sigev);	827	/* we need to do it this way so that the callback gets called before we continue */
254	}	828	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
255		829
		830	child_reap (EV_A_ sw, pid, pid, status);
		831	if (EV_PID_HASHSIZE > 1)
		832	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		833	}
		834
		835	#endif
		836
		837	/*****************************************************************************/
		838
		839	#if EV_USE_PORT
		840	# include "ev_port.c"
		841	#endif
		842	#if EV_USE_KQUEUE
		843	# include "ev_kqueue.c"
		844	#endif
256	#if HAVE_EPOLL	845	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	846	# include "ev_epoll.c"
258	#endif	847	#endif
		848	#if EV_USE_POLL
		849	# include "ev_poll.c"
		850	#endif
259	#if HAVE_SELECT	851	#if EV_USE_SELECT
260	# include "ev_select.c"	852	# include "ev_select.c"
261	#endif	853	#endif
262		854
263	int ev_init (int flags)	855	int
		856	ev_version_major (void)
264	{	857	{
		858	return EV_VERSION_MAJOR;
		859	}
		860
		861	int
		862	ev_version_minor (void)
		863	{
		864	return EV_VERSION_MINOR;
		865	}
		866
		867	/* return true if we are running with elevated privileges and should ignore env variables */
		868	int inline_size
		869	enable_secure (void)
		870	{
		871	#ifdef _WIN32
		872	return 0;
		873	#else
		874	return getuid () != geteuid ()
		875	|| getgid () != getegid ();
		876	#endif
		877	}
		878
		879	unsigned int
		880	ev_supported_backends (void)
		881	{
		882	unsigned int flags = 0;
		883
		884	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		885	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		886	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		887	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		888	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		889
		890	return flags;
		891	}
		892
		893	unsigned int
		894	ev_recommended_backends (void)
		895	{
		896	unsigned int flags = ev_supported_backends ();
		897
		898	#ifndef __NetBSD__
		899	/* kqueue is borked on everything but netbsd apparently */
		900	/* it usually doesn't work correctly on anything but sockets and pipes */
		901	flags &= ~EVBACKEND_KQUEUE;
		902	#endif
		903	#ifdef __APPLE__
		904	// flags &= ~EVBACKEND_KQUEUE; for documentation
		905	flags &= ~EVBACKEND_POLL;
		906	#endif
		907
		908	return flags;
		909	}
		910
		911	unsigned int
		912	ev_embeddable_backends (void)
		913	{
		914	return EVBACKEND_EPOLL
		915	| EVBACKEND_KQUEUE
		916	| EVBACKEND_PORT;
		917	}
		918
		919	unsigned int
		920	ev_backend (EV_P)
		921	{
		922	return backend;
		923	}
		924
		925	unsigned int
		926	ev_loop_count (EV_P)
		927	{
		928	return loop_count;
		929	}
		930
		931	static void noinline
		932	loop_init (EV_P_ unsigned int flags)
		933	{
		934	if (!backend)
		935	{
265	#if HAVE_MONOTONIC	936	#if EV_USE_MONOTONIC
266	{	937	{
267	struct timespec ts;	938	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	939	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	940	have_monotonic = 1;
270	}	941	}
271	#endif	942	#endif
272		943
273	ev_now = ev_time ();	944	ev_rt_now = ev_time ();
274	now = get_clock ();	945	mn_now = get_clock ();
275	diff = ev_now - now;	946	now_floor = mn_now;
		947	rtmn_diff = ev_rt_now - mn_now;
276		948
277	if (pipe (sigpipe))	949	/* pid check not overridable via env */
278	return 0;	950	#ifndef _WIN32
		951	if (flags & EVFLAG_FORKCHECK)
		952	curpid = getpid ();
		953	#endif
279		954
280	ev_method = EVMETHOD_NONE;	955	if (!(flags & EVFLAG_NOENV)
		956	&& !enable_secure ()
		957	&& getenv ("LIBEV_FLAGS"))
		958	flags = atoi (getenv ("LIBEV_FLAGS"));
		959
		960	if (!(flags & 0x0000ffffUL))
		961	flags |= ev_recommended_backends ();
		962
		963	backend = 0;
		964	backend_fd = -1;
		965	#if EV_USE_INOTIFY
		966	fs_fd = -2;
		967	#endif
		968
		969	#if EV_USE_PORT
		970	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		971	#endif
		972	#if EV_USE_KQUEUE
		973	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		974	#endif
281	#if HAVE_EPOLL	975	#if EV_USE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	976	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
283	#endif	977	#endif
		978	#if EV_USE_POLL
		979	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		980	#endif
284	#if HAVE_SELECT	981	#if EV_USE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);	982	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
286	#endif	983	#endif
287		984
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);	985	ev_init (&sigev, sigcb);
291	siginit ();	986	ev_set_priority (&sigev, EV_MAXPRI);
292	}	987	}
293
294	return ev_method;
295	}	988	}
296		989
297	void ev_prefork (void)	990	static void noinline
298	{	991	loop_destroy (EV_P)
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void
320	fd_reify (void)
321	{	992	{
322	int i;	993	int i;
323		994
324	for (i = 0; i < fdchangecnt; ++i)	995	#if EV_USE_INOTIFY
		996	if (fs_fd >= 0)
		997	close (fs_fd);
		998	#endif
		999
		1000	if (backend_fd >= 0)
		1001	close (backend_fd);
		1002
		1003	#if EV_USE_PORT
		1004	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1005	#endif
		1006	#if EV_USE_KQUEUE
		1007	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1008	#endif
		1009	#if EV_USE_EPOLL
		1010	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1011	#endif
		1012	#if EV_USE_POLL
		1013	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1014	#endif
		1015	#if EV_USE_SELECT
		1016	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1017	#endif
		1018
		1019	for (i = NUMPRI; i--; )
		1020	{
		1021	array_free (pending, [i]);
		1022	#if EV_IDLE_ENABLE
		1023	array_free (idle, [i]);
		1024	#endif
325	{	1025	}
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329		1026
330	int wev = 0;	1027	/* have to use the microsoft-never-gets-it-right macro */
		1028	array_free (fdchange, EMPTY);
		1029	array_free (timer, EMPTY);
		1030	#if EV_PERIODIC_ENABLE
		1031	array_free (periodic, EMPTY);
		1032	#endif
		1033	array_free (prepare, EMPTY);
		1034	array_free (check, EMPTY);
331		1035
332	for (w = anfd->head; w; w = w->next)	1036	backend = 0;
333	wev |= w->events;	1037	}
334		1038
335	if (anfd->wev != wev)	1039	void inline_size infy_fork (EV_P);
		1040
		1041	void inline_size
		1042	loop_fork (EV_P)
		1043	{
		1044	#if EV_USE_PORT
		1045	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1046	#endif
		1047	#if EV_USE_KQUEUE
		1048	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1049	#endif
		1050	#if EV_USE_EPOLL
		1051	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1052	#endif
		1053	#if EV_USE_INOTIFY
		1054	infy_fork (EV_A);
		1055	#endif
		1056
		1057	if (ev_is_active (&sigev))
		1058	{
		1059	/* default loop */
		1060
		1061	ev_ref (EV_A);
		1062	ev_io_stop (EV_A_ &sigev);
		1063	close (sigpipe [0]);
		1064	close (sigpipe [1]);
		1065
		1066	while (pipe (sigpipe))
		1067	syserr ("(libev) error creating pipe");
		1068
		1069	siginit (EV_A);
		1070	}
		1071
		1072	postfork = 0;
		1073	}
		1074
		1075	#if EV_MULTIPLICITY
		1076	struct ev_loop *
		1077	ev_loop_new (unsigned int flags)
		1078	{
		1079	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1080
		1081	memset (loop, 0, sizeof (struct ev_loop));
		1082
		1083	loop_init (EV_A_ flags);
		1084
		1085	if (ev_backend (EV_A))
		1086	return loop;
		1087
		1088	return 0;
		1089	}
		1090
		1091	void
		1092	ev_loop_destroy (EV_P)
		1093	{
		1094	loop_destroy (EV_A);
		1095	ev_free (loop);
		1096	}
		1097
		1098	void
		1099	ev_loop_fork (EV_P)
		1100	{
		1101	postfork = 1;
		1102	}
		1103
		1104	#endif
		1105
		1106	#if EV_MULTIPLICITY
		1107	struct ev_loop *
		1108	ev_default_loop_init (unsigned int flags)
		1109	#else
		1110	int
		1111	ev_default_loop (unsigned int flags)
		1112	#endif
		1113	{
		1114	if (sigpipe [0] == sigpipe [1])
		1115	if (pipe (sigpipe))
		1116	return 0;
		1117
		1118	if (!ev_default_loop_ptr)
		1119	{
		1120	#if EV_MULTIPLICITY
		1121	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1122	#else
		1123	ev_default_loop_ptr = 1;
		1124	#endif
		1125
		1126	loop_init (EV_A_ flags);
		1127
		1128	if (ev_backend (EV_A))
336	{	1129	{
337	method_modify (fd, anfd->wev, wev);	1130	siginit (EV_A);
338	anfd->wev = wev;	1131
		1132	#ifndef _WIN32
		1133	ev_signal_init (&childev, childcb, SIGCHLD);
		1134	ev_set_priority (&childev, EV_MAXPRI);
		1135	ev_signal_start (EV_A_ &childev);
		1136	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1137	#endif
339	}	1138	}
		1139	else
		1140	ev_default_loop_ptr = 0;
340	}	1141	}
341		1142
342	fdchangecnt = 0;	1143	return ev_default_loop_ptr;
343	}	1144	}
344		1145
345	static void	1146	void
		1147	ev_default_destroy (void)
		1148	{
		1149	#if EV_MULTIPLICITY
		1150	struct ev_loop *loop = ev_default_loop_ptr;
		1151	#endif
		1152
		1153	#ifndef _WIN32
		1154	ev_ref (EV_A); /* child watcher */
		1155	ev_signal_stop (EV_A_ &childev);
		1156	#endif
		1157
		1158	ev_ref (EV_A); /* signal watcher */
		1159	ev_io_stop (EV_A_ &sigev);
		1160
		1161	close (sigpipe [0]); sigpipe [0] = 0;
		1162	close (sigpipe [1]); sigpipe [1] = 0;
		1163
		1164	loop_destroy (EV_A);
		1165	}
		1166
		1167	void
		1168	ev_default_fork (void)
		1169	{
		1170	#if EV_MULTIPLICITY
		1171	struct ev_loop *loop = ev_default_loop_ptr;
		1172	#endif
		1173
		1174	if (backend)
		1175	postfork = 1;
		1176	}
		1177
		1178	/*****************************************************************************/
		1179
		1180	void
		1181	ev_invoke (EV_P_ void *w, int revents)
		1182	{
		1183	EV_CB_INVOKE ((W)w, revents);
		1184	}
		1185
		1186	void inline_speed
346	call_pending ()	1187	call_pending (EV_P)
347	{	1188	{
348	int i;	1189	int pri;
349		1190
350	for (i = 0; i < pendingcnt; ++i)	1191	for (pri = NUMPRI; pri--; )
		1192	while (pendingcnt [pri])
351	{	1193	{
352	ANPENDING *p = pendings + i;	1194	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
353		1195
354	if (p->w)	1196	if (expect_true (p->w))
355	{	1197	{
		1198	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1199
356	p->w->pending = 0;	1200	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	1201	EV_CB_INVOKE (p->w, p->events);
358	}	1202	}
359	}	1203	}
360
361	pendingcnt = 0;
362	}	1204	}
363		1205
364	static void	1206	void inline_size
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1207	timers_reify (EV_P)
366	{	1208	{
367	while (timercnt && timers [0]->at <= now)	1209	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	1210	{
369	struct ev_timer *w = timers [0];	1211	ev_timer *w = timers [0];
		1212
		1213	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
370		1214
371	/* first reschedule or stop timer */	1215	/* first reschedule or stop timer */
372	if (w->repeat)	1216	if (w->repeat)
373	{	1217	{
374	if (w->is_abs)	1218	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1219
376	else
377	w->at = now + w->repeat;	1220	((WT)w)->at += w->repeat;
		1221	if (((WT)w)->at < mn_now)
		1222	((WT)w)->at = mn_now;
378		1223
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	1224	downheap ((WT *)timers, timercnt, 0);
382	}	1225	}
383	else	1226	else
		1227	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1228
		1229	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1230	}
		1231	}
		1232
		1233	#if EV_PERIODIC_ENABLE
		1234	void inline_size
		1235	periodics_reify (EV_P)
		1236	{
		1237	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1238	{
		1239	ev_periodic *w = periodics [0];
		1240
		1241	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1242
		1243	/* first reschedule or stop timer */
		1244	if (w->reschedule_cb)
384	{	1245	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	1246	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
386	--timercnt; /* maybe pass by reference instead? */	1247	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1248	downheap ((WT *)periodics, periodiccnt, 0);
387	}	1249	}
		1250	else if (w->interval)
		1251	{
		1252	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1253	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1254	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1255	downheap ((WT *)periodics, periodiccnt, 0);
		1256	}
		1257	else
		1258	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1259
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1260	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1261	}
391	}	1262	}
392		1263
393	static void	1264	static void noinline
394	time_update ()	1265	periodics_reschedule (EV_P)
395	{	1266	{
396	int i;	1267	int i;
397	ev_now = ev_time ();
398		1268
399	if (have_monotonic)	1269	/* adjust periodics after time jump */
		1270	for (i = 0; i < periodiccnt; ++i)
		1271	{
		1272	ev_periodic *w = periodics [i];
		1273
		1274	if (w->reschedule_cb)
		1275	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1276	else if (w->interval)
		1277	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
400	{	1278	}
401	ev_tstamp odiff = diff;
402		1279
403	/* detecting time jumps is much more difficult */	1280	/* now rebuild the heap */
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1281	for (i = periodiccnt >> 1; i--; )
		1282	downheap ((WT *)periodics, periodiccnt, i);
		1283	}
		1284	#endif
		1285
		1286	#if EV_IDLE_ENABLE
		1287	void inline_size
		1288	idle_reify (EV_P)
		1289	{
		1290	if (expect_false (idleall))
		1291	{
		1292	int pri;
		1293
		1294	for (pri = NUMPRI; pri--; )
405	{	1295	{
		1296	if (pendingcnt [pri])
		1297	break;
		1298
		1299	if (idlecnt [pri])
		1300	{
		1301	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1302	break;
		1303	}
		1304	}
		1305	}
		1306	}
		1307	#endif
		1308
		1309	void inline_speed
		1310	time_update (EV_P_ ev_tstamp max_block)
		1311	{
		1312	int i;
		1313
		1314	#if EV_USE_MONOTONIC
		1315	if (expect_true (have_monotonic))
		1316	{
		1317	ev_tstamp odiff = rtmn_diff;
		1318
406	now = get_clock ();	1319	mn_now = get_clock ();
		1320
		1321	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1322	/* interpolate in the meantime */
		1323	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1324	{
		1325	ev_rt_now = rtmn_diff + mn_now;
		1326	return;
		1327	}
		1328
		1329	now_floor = mn_now;
		1330	ev_rt_now = ev_time ();
		1331
		1332	/* loop a few times, before making important decisions.
		1333	* on the choice of "4": one iteration isn't enough,
		1334	* in case we get preempted during the calls to
		1335	* ev_time and get_clock. a second call is almost guaranteed
		1336	* to succeed in that case, though. and looping a few more times
		1337	* doesn't hurt either as we only do this on time-jumps or
		1338	* in the unlikely event of having been preempted here.
		1339	*/
		1340	for (i = 4; --i; )
		1341	{
407	diff = ev_now - now;	1342	rtmn_diff = ev_rt_now - mn_now;
408		1343
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1344	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1345	return; /* all is well */
411		1346
412	ev_now = ev_time ();	1347	ev_rt_now = ev_time ();
		1348	mn_now = get_clock ();
		1349	now_floor = mn_now;
413	}	1350	}
414		1351
415	/* time jump detected, reschedule atimers */	1352	# if EV_PERIODIC_ENABLE
416	for (i = 0; i < atimercnt; ++i)	1353	periodics_reschedule (EV_A);
		1354	# endif
		1355	/* no timer adjustment, as the monotonic clock doesn't jump */
		1356	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1357	}
		1358	else
		1359	#endif
		1360	{
		1361	ev_rt_now = ev_time ();
		1362
		1363	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
417	{	1364	{
418	struct ev_timer *w = atimers [i];	1365	#if EV_PERIODIC_ENABLE
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1366	periodics_reschedule (EV_A);
		1367	#endif
		1368	/* adjust timers. this is easy, as the offset is the same for all of them */
		1369	for (i = 0; i < timercnt; ++i)
		1370	((WT)timers [i])->at += ev_rt_now - mn_now;
420	}	1371	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1372
429	now = ev_now;	1373	mn_now = ev_rt_now;
430	}	1374	}
431	}	1375	}
432		1376
433	int ev_loop_done;	1377	void
		1378	ev_ref (EV_P)
		1379	{
		1380	++activecnt;
		1381	}
434		1382
		1383	void
		1384	ev_unref (EV_P)
		1385	{
		1386	--activecnt;
		1387	}
		1388
		1389	static int loop_done;
		1390
		1391	void
435	void ev_loop (int flags)	1392	ev_loop (EV_P_ int flags)
436	{	1393	{
437	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1394	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1395	? EVUNLOOP_ONE
		1396	: EVUNLOOP_CANCEL;
		1397
		1398	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
439		1399
440	do	1400	do
441	{	1401	{
		1402	#ifndef _WIN32
		1403	if (expect_false (curpid)) /* penalise the forking check even more */
		1404	if (expect_false (getpid () != curpid))
		1405	{
		1406	curpid = getpid ();
		1407	postfork = 1;
		1408	}
		1409	#endif
		1410
		1411	#if EV_FORK_ENABLE
		1412	/* we might have forked, so queue fork handlers */
		1413	if (expect_false (postfork))
		1414	if (forkcnt)
		1415	{
		1416	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1417	call_pending (EV_A);
		1418	}
		1419	#endif
		1420
		1421	/* queue prepare watchers (and execute them) */
		1422	if (expect_false (preparecnt))
		1423	{
		1424	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1425	call_pending (EV_A);
		1426	}
		1427
		1428	if (expect_false (!activecnt))
		1429	break;
		1430
		1431	/* we might have forked, so reify kernel state if necessary */
		1432	if (expect_false (postfork))
		1433	loop_fork (EV_A);
		1434
442	/* update fd-related kernel structures */	1435	/* update fd-related kernel structures */
443	fd_reify ();	1436	fd_reify (EV_A);
444		1437
445	/* calculate blocking time */	1438	/* calculate blocking time */
446	if (flags & EVLOOP_NONBLOCK)	1439	{
447	block = 0.;	1440	ev_tstamp block;
		1441
		1442	if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
		1443	block = 0.; /* do not block at all */
448	else	1444	else
449	{	1445	{
		1446	/* update time to cancel out callback processing overhead */
		1447	time_update (EV_A_ 1e100);
		1448
450	block = MAX_BLOCKTIME;	1449	block = MAX_BLOCKTIME;
451		1450
452	if (rtimercnt)	1451	if (timercnt)
453	{	1452	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1453	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
455	if (block > to) block = to;	1454	if (block > to) block = to;
456	}	1455	}
457		1456
		1457	#if EV_PERIODIC_ENABLE
458	if (atimercnt)	1458	if (periodiccnt)
459	{	1459	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1460	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
461	if (block > to) block = to;	1461	if (block > to) block = to;
462	}	1462	}
		1463	#endif
463		1464
464	if (block < 0.) block = 0.;	1465	if (expect_false (block < 0.)) block = 0.;
465	}	1466	}
466		1467
467	method_poll (block);	1468	++loop_count;
		1469	backend_poll (EV_A_ block);
468		1470
469	/* update ev_now, do magic */	1471	/* update ev_rt_now, do magic */
470	time_update ();	1472	time_update (EV_A_ block);
		1473	}
471		1474
472	/* put pending timers into pendign queue and reschedule them */	1475	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1476	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1477	#if EV_PERIODIC_ENABLE
475	/* relative timers second */	1478	periodics_reify (EV_A); /* absolute timers called first */
476	timers_reify (rtimers, rtimercnt, now);	1479	#endif
477		1480
		1481	#if EV_IDLE_ENABLE
		1482	/* queue idle watchers unless other events are pending */
		1483	idle_reify (EV_A);
		1484	#endif
		1485
		1486	/* queue check watchers, to be executed first */
		1487	if (expect_false (checkcnt))
		1488	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1489
478	call_pending ();	1490	call_pending (EV_A);
479	}
480	while (!ev_loop_done);
481	}
482		1491
483	static void	1492	}
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1493	while (expect_true (activecnt && !loop_done));
		1494
		1495	if (loop_done == EVUNLOOP_ONE)
		1496	loop_done = EVUNLOOP_CANCEL;
		1497	}
		1498
		1499	void
		1500	ev_unloop (EV_P_ int how)
		1501	{
		1502	loop_done = how;
		1503	}
		1504
		1505	/*****************************************************************************/
		1506
		1507	void inline_size
		1508	wlist_add (WL *head, WL elem)
485	{	1509	{
486	elem->next = *head;	1510	elem->next = *head;
487	*head = elem;	1511	*head = elem;
488	}	1512	}
489		1513
490	static void	1514	void inline_size
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1515	wlist_del (WL *head, WL elem)
492	{	1516	{
493	while (*head)	1517	while (*head)
494	{	1518	{
495	if (*head == elem)	1519	if (*head == elem)
496	{	1520	{
…		…
500		1524
501	head = &(*head)->next;	1525	head = &(*head)->next;
502	}	1526	}
503	}	1527	}
504		1528
505	static void	1529	void inline_speed
506	ev_start (struct ev_watcher *w, int active)	1530	clear_pending (EV_P_ W w)
507	{	1531	{
		1532	if (w->pending)
		1533	{
		1534	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1535	w->pending = 0;
		1536	}
		1537	}
		1538
		1539	int
		1540	ev_clear_pending (EV_P_ void *w)
		1541	{
		1542	W w_ = (W)w;
		1543	int pending = w_->pending;
		1544
		1545	if (expect_true (pending))
		1546	{
		1547	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1548	w_->pending = 0;
		1549	p->w = 0;
		1550	return p->events;
		1551	}
		1552	else
		1553	return 0;
		1554	}
		1555
		1556	void inline_size
		1557	pri_adjust (EV_P_ W w)
		1558	{
		1559	int pri = w->priority;
		1560	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1561	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1562	w->priority = pri;
		1563	}
		1564
		1565	void inline_speed
		1566	ev_start (EV_P_ W w, int active)
		1567	{
		1568	pri_adjust (EV_A_ w);
509	w->active = active;	1569	w->active = active;
		1570	ev_ref (EV_A);
510	}	1571	}
511		1572
512	static void	1573	void inline_size
513	ev_stop (struct ev_watcher *w)	1574	ev_stop (EV_P_ W w)
514	{	1575	{
515	if (w->pending)	1576	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1577	w->active = 0;
519	/* nop */
520	}	1578	}
521		1579
522	void	1580	/*****************************************************************************/
		1581
		1582	void noinline
523	evio_start (struct ev_io *w)	1583	ev_io_start (EV_P_ ev_io *w)
		1584	{
		1585	int fd = w->fd;
		1586
		1587	if (expect_false (ev_is_active (w)))
		1588	return;
		1589
		1590	assert (("ev_io_start called with negative fd", fd >= 0));
		1591
		1592	ev_start (EV_A_ (W)w, 1);
		1593	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1594	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1595
		1596	fd_change (EV_A_ fd);
		1597	}
		1598
		1599	void noinline
		1600	ev_io_stop (EV_P_ ev_io *w)
		1601	{
		1602	clear_pending (EV_A_ (W)w);
		1603	if (expect_false (!ev_is_active (w)))
		1604	return;
		1605
		1606	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1607
		1608	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1609	ev_stop (EV_A_ (W)w);
		1610
		1611	fd_change (EV_A_ w->fd);
		1612	}
		1613
		1614	void noinline
		1615	ev_timer_start (EV_P_ ev_timer *w)
		1616	{
		1617	if (expect_false (ev_is_active (w)))
		1618	return;
		1619
		1620	((WT)w)->at += mn_now;
		1621
		1622	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1623
		1624	ev_start (EV_A_ (W)w, ++timercnt);
		1625	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1626	timers [timercnt - 1] = w;
		1627	upheap ((WT *)timers, timercnt - 1);
		1628
		1629	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1630	}
		1631
		1632	void noinline
		1633	ev_timer_stop (EV_P_ ev_timer *w)
		1634	{
		1635	clear_pending (EV_A_ (W)w);
		1636	if (expect_false (!ev_is_active (w)))
		1637	return;
		1638
		1639	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1640
		1641	{
		1642	int active = ((W)w)->active;
		1643
		1644	if (expect_true (--active < --timercnt))
		1645	{
		1646	timers [active] = timers [timercnt];
		1647	adjustheap ((WT *)timers, timercnt, active);
		1648	}
		1649	}
		1650
		1651	((WT)w)->at -= mn_now;
		1652
		1653	ev_stop (EV_A_ (W)w);
		1654	}
		1655
		1656	void noinline
		1657	ev_timer_again (EV_P_ ev_timer *w)
524	{	1658	{
525	if (ev_is_active (w))	1659	if (ev_is_active (w))
526	return;
527
528	int fd = w->fd;
529
530	ev_start ((struct ev_watcher *)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
533
534	++fdchangecnt;
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}
538
539	void
540	evio_stop (struct ev_io *w)
541	{
542	if (!ev_is_active (w))
543	return;
544
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
546	ev_stop ((struct ev_watcher *)w);
547
548	++fdchangecnt;
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}
552
553	void
554	evtimer_start (struct ev_timer *w)
555	{
556	if (ev_is_active (w))
557	return;
558
559	if (w->is_abs)
560	{	1660	{
561	/* this formula differs from the one in timer_reify becuse we do not round up */
562	if (w->repeat)	1661	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1662	{
		1663	((WT)w)->at = mn_now + w->repeat;
		1664	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1665	}
		1666	else
		1667	ev_timer_stop (EV_A_ w);
		1668	}
		1669	else if (w->repeat)
		1670	{
		1671	w->at = w->repeat;
		1672	ev_timer_start (EV_A_ w);
		1673	}
		1674	}
564		1675
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1676	#if EV_PERIODIC_ENABLE
566	array_needsize (atimers, atimermax, atimercnt, );	1677	void noinline
567	atimers [atimercnt - 1] = w;	1678	ev_periodic_start (EV_P_ ev_periodic *w)
568	upheap (atimers, atimercnt - 1);	1679	{
		1680	if (expect_false (ev_is_active (w)))
		1681	return;
		1682
		1683	if (w->reschedule_cb)
		1684	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1685	else if (w->interval)
		1686	{
		1687	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1688	/* this formula differs from the one in periodic_reify because we do not always round up */
		1689	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
569	}	1690	}
570	else	1691	else
571	{	1692	((WT)w)->at = w->offset;
572	w->at += now;
573		1693
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1694	ev_start (EV_A_ (W)w, ++periodiccnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );	1695	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
576	rtimers [rtimercnt - 1] = w;	1696	periodics [periodiccnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);	1697	upheap ((WT *)periodics, periodiccnt - 1);
578	}
579		1698
		1699	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
580	}	1700	}
581		1701
582	void	1702	void noinline
583	evtimer_stop (struct ev_timer *w)	1703	ev_periodic_stop (EV_P_ ev_periodic *w)
584	{	1704	{
		1705	clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1706	if (expect_false (!ev_is_active (w)))
586	return;	1707	return;
587		1708
588	if (w->is_abs)	1709	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1710
589	{	1711	{
590	if (w->active < atimercnt--)	1712	int active = ((W)w)->active;
		1713
		1714	if (expect_true (--active < --periodiccnt))
591	{	1715	{
592	atimers [w->active - 1] = atimers [atimercnt];	1716	periodics [active] = periodics [periodiccnt];
593	downheap (atimers, atimercnt, w->active - 1);	1717	adjustheap ((WT *)periodics, periodiccnt, active);
594	}	1718	}
595	}	1719	}
596	else
597	{
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1720
605	ev_stop ((struct ev_watcher *)w);	1721	ev_stop (EV_A_ (W)w);
606	}	1722	}
607		1723
608	void	1724	void noinline
		1725	ev_periodic_again (EV_P_ ev_periodic *w)
		1726	{
		1727	/* TODO: use adjustheap and recalculation */
		1728	ev_periodic_stop (EV_A_ w);
		1729	ev_periodic_start (EV_A_ w);
		1730	}
		1731	#endif
		1732
		1733	#ifndef SA_RESTART
		1734	# define SA_RESTART 0
		1735	#endif
		1736
		1737	void noinline
609	evsignal_start (struct ev_signal *w)	1738	ev_signal_start (EV_P_ ev_signal *w)
610	{	1739	{
		1740	#if EV_MULTIPLICITY
		1741	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1742	#endif
611	if (ev_is_active (w))	1743	if (expect_false (ev_is_active (w)))
612	return;	1744	return;
613		1745
614	ev_start ((struct ev_watcher *)w, 1);	1746	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1747
		1748	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1749	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1750	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1751
618	if (!w->next)	1752	if (!((WL)w)->next)
619	{	1753	{
		1754	#if _WIN32
		1755	signal (w->signum, sighandler);
		1756	#else
620	struct sigaction sa;	1757	struct sigaction sa;
621	sa.sa_handler = sighandler;	1758	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1759	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1760	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1761	sigaction (w->signum, &sa, 0);
		1762	#endif
625	}	1763	}
626	}	1764	}
627		1765
628	void	1766	void noinline
629	evsignal_stop (struct ev_signal *w)	1767	ev_signal_stop (EV_P_ ev_signal *w)
630	{	1768	{
		1769	clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1770	if (expect_false (!ev_is_active (w)))
632	return;	1771	return;
633		1772
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1773	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1774	ev_stop (EV_A_ (W)w);
636		1775
637	if (!signals [w->signum - 1].head)	1776	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1777	signal (w->signum, SIG_DFL);
639	}	1778	}
640		1779
		1780	void
		1781	ev_child_start (EV_P_ ev_child *w)
		1782	{
		1783	#if EV_MULTIPLICITY
		1784	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1785	#endif
		1786	if (expect_false (ev_is_active (w)))
		1787	return;
		1788
		1789	ev_start (EV_A_ (W)w, 1);
		1790	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1791	}
		1792
		1793	void
		1794	ev_child_stop (EV_P_ ev_child *w)
		1795	{
		1796	clear_pending (EV_A_ (W)w);
		1797	if (expect_false (!ev_is_active (w)))
		1798	return;
		1799
		1800	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1801	ev_stop (EV_A_ (W)w);
		1802	}
		1803
		1804	#if EV_STAT_ENABLE
		1805
		1806	# ifdef _WIN32
		1807	# undef lstat
		1808	# define lstat(a,b) _stati64 (a,b)
		1809	# endif
		1810
		1811	#define DEF_STAT_INTERVAL 5.0074891
		1812	#define MIN_STAT_INTERVAL 0.1074891
		1813
		1814	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1815
		1816	#if EV_USE_INOTIFY
		1817	# define EV_INOTIFY_BUFSIZE 8192
		1818
		1819	static void noinline
		1820	infy_add (EV_P_ ev_stat *w)
		1821	{
		1822	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);
		1823
		1824	if (w->wd < 0)
		1825	{
		1826	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1827
		1828	/* monitor some parent directory for speedup hints */
		1829	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1830	{
		1831	char path [4096];
		1832	strcpy (path, w->path);
		1833
		1834	do
		1835	{
		1836	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1837	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1838
		1839	char *pend = strrchr (path, '/');
		1840
		1841	if (!pend)
		1842	break; /* whoops, no '/', complain to your admin */
		1843
		1844	*pend = 0;
		1845	w->wd = inotify_add_watch (fs_fd, path, mask);
		1846	}
		1847	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1848	}
		1849	}
		1850	else
		1851	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1852
		1853	if (w->wd >= 0)
		1854	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1855	}
		1856
		1857	static void noinline
		1858	infy_del (EV_P_ ev_stat *w)
		1859	{
		1860	int slot;
		1861	int wd = w->wd;
		1862
		1863	if (wd < 0)
		1864	return;
		1865
		1866	w->wd = -2;
		1867	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1868	wlist_del (&fs_hash [slot].head, (WL)w);
		1869
		1870	/* remove this watcher, if others are watching it, they will rearm */
		1871	inotify_rm_watch (fs_fd, wd);
		1872	}
		1873
		1874	static void noinline
		1875	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1876	{
		1877	if (slot < 0)
		1878	/* overflow, need to check for all hahs slots */
		1879	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1880	infy_wd (EV_A_ slot, wd, ev);
		1881	else
		1882	{
		1883	WL w_;
		1884
		1885	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1886	{
		1887	ev_stat *w = (ev_stat *)w_;
		1888	w_ = w_->next; /* lets us remove this watcher and all before it */
		1889
		1890	if (w->wd == wd || wd == -1)
		1891	{
		1892	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1893	{
		1894	w->wd = -1;
		1895	infy_add (EV_A_ w); /* re-add, no matter what */
		1896	}
		1897
		1898	stat_timer_cb (EV_A_ &w->timer, 0);
		1899	}
		1900	}
		1901	}
		1902	}
		1903
		1904	static void
		1905	infy_cb (EV_P_ ev_io *w, int revents)
		1906	{
		1907	char buf [EV_INOTIFY_BUFSIZE];
		1908	struct inotify_event *ev = (struct inotify_event *)buf;
		1909	int ofs;
		1910	int len = read (fs_fd, buf, sizeof (buf));
		1911
		1912	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1913	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1914	}
		1915
		1916	void inline_size
		1917	infy_init (EV_P)
		1918	{
		1919	if (fs_fd != -2)
		1920	return;
		1921
		1922	fs_fd = inotify_init ();
		1923
		1924	if (fs_fd >= 0)
		1925	{
		1926	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1927	ev_set_priority (&fs_w, EV_MAXPRI);
		1928	ev_io_start (EV_A_ &fs_w);
		1929	}
		1930	}
		1931
		1932	void inline_size
		1933	infy_fork (EV_P)
		1934	{
		1935	int slot;
		1936
		1937	if (fs_fd < 0)
		1938	return;
		1939
		1940	close (fs_fd);
		1941	fs_fd = inotify_init ();
		1942
		1943	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1944	{
		1945	WL w_ = fs_hash [slot].head;
		1946	fs_hash [slot].head = 0;
		1947
		1948	while (w_)
		1949	{
		1950	ev_stat *w = (ev_stat *)w_;
		1951	w_ = w_->next; /* lets us add this watcher */
		1952
		1953	w->wd = -1;
		1954
		1955	if (fs_fd >= 0)
		1956	infy_add (EV_A_ w); /* re-add, no matter what */
		1957	else
		1958	ev_timer_start (EV_A_ &w->timer);
		1959	}
		1960
		1961	}
		1962	}
		1963
		1964	#endif
		1965
		1966	void
		1967	ev_stat_stat (EV_P_ ev_stat *w)
		1968	{
		1969	if (lstat (w->path, &w->attr) < 0)
		1970	w->attr.st_nlink = 0;
		1971	else if (!w->attr.st_nlink)
		1972	w->attr.st_nlink = 1;
		1973	}
		1974
		1975	static void noinline
		1976	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1977	{
		1978	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1979
		1980	/* we copy this here each the time so that */
		1981	/* prev has the old value when the callback gets invoked */
		1982	w->prev = w->attr;
		1983	ev_stat_stat (EV_A_ w);
		1984
		1985	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		1986	if (
		1987	w->prev.st_dev != w->attr.st_dev
		1988	|| w->prev.st_ino != w->attr.st_ino
		1989	|| w->prev.st_mode != w->attr.st_mode
		1990	|| w->prev.st_nlink != w->attr.st_nlink
		1991	|| w->prev.st_uid != w->attr.st_uid
		1992	|| w->prev.st_gid != w->attr.st_gid
		1993	|| w->prev.st_rdev != w->attr.st_rdev
		1994	|| w->prev.st_size != w->attr.st_size
		1995	|| w->prev.st_atime != w->attr.st_atime
		1996	|| w->prev.st_mtime != w->attr.st_mtime
		1997	|| w->prev.st_ctime != w->attr.st_ctime
		1998	) {
		1999	#if EV_USE_INOTIFY
		2000	infy_del (EV_A_ w);
		2001	infy_add (EV_A_ w);
		2002	ev_stat_stat (EV_A_ w); /* avoid race... */
		2003	#endif
		2004
		2005	ev_feed_event (EV_A_ w, EV_STAT);
		2006	}
		2007	}
		2008
		2009	void
		2010	ev_stat_start (EV_P_ ev_stat *w)
		2011	{
		2012	if (expect_false (ev_is_active (w)))
		2013	return;
		2014
		2015	/* since we use memcmp, we need to clear any padding data etc. */
		2016	memset (&w->prev, 0, sizeof (ev_statdata));
		2017	memset (&w->attr, 0, sizeof (ev_statdata));
		2018
		2019	ev_stat_stat (EV_A_ w);
		2020
		2021	if (w->interval < MIN_STAT_INTERVAL)
		2022	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2023
		2024	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2025	ev_set_priority (&w->timer, ev_priority (w));
		2026
		2027	#if EV_USE_INOTIFY
		2028	infy_init (EV_A);
		2029
		2030	if (fs_fd >= 0)
		2031	infy_add (EV_A_ w);
		2032	else
		2033	#endif
		2034	ev_timer_start (EV_A_ &w->timer);
		2035
		2036	ev_start (EV_A_ (W)w, 1);
		2037	}
		2038
		2039	void
		2040	ev_stat_stop (EV_P_ ev_stat *w)
		2041	{
		2042	clear_pending (EV_A_ (W)w);
		2043	if (expect_false (!ev_is_active (w)))
		2044	return;
		2045
		2046	#if EV_USE_INOTIFY
		2047	infy_del (EV_A_ w);
		2048	#endif
		2049	ev_timer_stop (EV_A_ &w->timer);
		2050
		2051	ev_stop (EV_A_ (W)w);
		2052	}
		2053	#endif
		2054
		2055	#if EV_IDLE_ENABLE
		2056	void
		2057	ev_idle_start (EV_P_ ev_idle *w)
		2058	{
		2059	if (expect_false (ev_is_active (w)))
		2060	return;
		2061
		2062	pri_adjust (EV_A_ (W)w);
		2063
		2064	{
		2065	int active = ++idlecnt [ABSPRI (w)];
		2066
		2067	++idleall;
		2068	ev_start (EV_A_ (W)w, active);
		2069
		2070	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2071	idles [ABSPRI (w)][active - 1] = w;
		2072	}
		2073	}
		2074
		2075	void
		2076	ev_idle_stop (EV_P_ ev_idle *w)
		2077	{
		2078	clear_pending (EV_A_ (W)w);
		2079	if (expect_false (!ev_is_active (w)))
		2080	return;
		2081
		2082	{
		2083	int active = ((W)w)->active;
		2084
		2085	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2086	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2087
		2088	ev_stop (EV_A_ (W)w);
		2089	--idleall;
		2090	}
		2091	}
		2092	#endif
		2093
		2094	void
		2095	ev_prepare_start (EV_P_ ev_prepare *w)
		2096	{
		2097	if (expect_false (ev_is_active (w)))
		2098	return;
		2099
		2100	ev_start (EV_A_ (W)w, ++preparecnt);
		2101	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2102	prepares [preparecnt - 1] = w;
		2103	}
		2104
		2105	void
		2106	ev_prepare_stop (EV_P_ ev_prepare *w)
		2107	{
		2108	clear_pending (EV_A_ (W)w);
		2109	if (expect_false (!ev_is_active (w)))
		2110	return;
		2111
		2112	{
		2113	int active = ((W)w)->active;
		2114	prepares [active - 1] = prepares [--preparecnt];
		2115	((W)prepares [active - 1])->active = active;
		2116	}
		2117
		2118	ev_stop (EV_A_ (W)w);
		2119	}
		2120
		2121	void
		2122	ev_check_start (EV_P_ ev_check *w)
		2123	{
		2124	if (expect_false (ev_is_active (w)))
		2125	return;
		2126
		2127	ev_start (EV_A_ (W)w, ++checkcnt);
		2128	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2129	checks [checkcnt - 1] = w;
		2130	}
		2131
		2132	void
		2133	ev_check_stop (EV_P_ ev_check *w)
		2134	{
		2135	clear_pending (EV_A_ (W)w);
		2136	if (expect_false (!ev_is_active (w)))
		2137	return;
		2138
		2139	{
		2140	int active = ((W)w)->active;
		2141	checks [active - 1] = checks [--checkcnt];
		2142	((W)checks [active - 1])->active = active;
		2143	}
		2144
		2145	ev_stop (EV_A_ (W)w);
		2146	}
		2147
		2148	#if EV_EMBED_ENABLE
		2149	void noinline
		2150	ev_embed_sweep (EV_P_ ev_embed *w)
		2151	{
		2152	ev_loop (w->loop, EVLOOP_NONBLOCK);
		2153	}
		2154
		2155	static void
		2156	embed_cb (EV_P_ ev_io *io, int revents)
		2157	{
		2158	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		2159
		2160	if (ev_cb (w))
		2161	ev_feed_event (EV_A_ (W)w, EV_EMBED);
		2162	else
		2163	ev_embed_sweep (loop, w);
		2164	}
		2165
		2166	void
		2167	ev_embed_start (EV_P_ ev_embed *w)
		2168	{
		2169	if (expect_false (ev_is_active (w)))
		2170	return;
		2171
		2172	{
		2173	struct ev_loop *loop = w->loop;
		2174	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		2175	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		2176	}
		2177
		2178	ev_set_priority (&w->io, ev_priority (w));
		2179	ev_io_start (EV_A_ &w->io);
		2180
		2181	ev_start (EV_A_ (W)w, 1);
		2182	}
		2183
		2184	void
		2185	ev_embed_stop (EV_P_ ev_embed *w)
		2186	{
		2187	clear_pending (EV_A_ (W)w);
		2188	if (expect_false (!ev_is_active (w)))
		2189	return;
		2190
		2191	ev_io_stop (EV_A_ &w->io);
		2192
		2193	ev_stop (EV_A_ (W)w);
		2194	}
		2195	#endif
		2196
		2197	#if EV_FORK_ENABLE
		2198	void
		2199	ev_fork_start (EV_P_ ev_fork *w)
		2200	{
		2201	if (expect_false (ev_is_active (w)))
		2202	return;
		2203
		2204	ev_start (EV_A_ (W)w, ++forkcnt);
		2205	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2206	forks [forkcnt - 1] = w;
		2207	}
		2208
		2209	void
		2210	ev_fork_stop (EV_P_ ev_fork *w)
		2211	{
		2212	clear_pending (EV_A_ (W)w);
		2213	if (expect_false (!ev_is_active (w)))
		2214	return;
		2215
		2216	{
		2217	int active = ((W)w)->active;
		2218	forks [active - 1] = forks [--forkcnt];
		2219	((W)forks [active - 1])->active = active;
		2220	}
		2221
		2222	ev_stop (EV_A_ (W)w);
		2223	}
		2224	#endif
		2225
641	/*****************************************************************************/	2226	/*****************************************************************************/
642	#if 1	2227
		2228	struct ev_once
		2229	{
		2230	ev_io io;
		2231	ev_timer to;
		2232	void (*cb)(int revents, void *arg);
		2233	void *arg;
		2234	};
643		2235
644	static void	2236	static void
645	sin_cb (struct ev_io *w, int revents)	2237	once_cb (EV_P_ struct ev_once *once, int revents)
646	{	2238	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2239	void (*cb)(int revents, void *arg) = once->cb;
		2240	void *arg = once->arg;
		2241
		2242	ev_io_stop (EV_A_ &once->io);
		2243	ev_timer_stop (EV_A_ &once->to);
		2244	ev_free (once);
		2245
		2246	cb (revents, arg);
648	}	2247	}
649		2248
650	static void	2249	static void
651	ocb (struct ev_timer *w, int revents)	2250	once_cb_io (EV_P_ ev_io *w, int revents)
652	{	2251	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2252	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}	2253	}
657		2254
658	static void	2255	static void
659	scb (struct ev_signal *w, int revents)	2256	once_cb_to (EV_P_ ev_timer *w, int revents)
660	{	2257	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	2258	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
662	}	2259	}
663		2260
664	int main (void)	2261	void
		2262	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
665	{	2263	{
666	struct ev_io sin;	2264	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
667		2265
668	ev_init (0);	2266	if (expect_false (!once))
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}	2267	{
687	#endif	2268	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
688
689	struct ev_timer t1;
690	evw_init (&t1, ocb, 0);
691	evtimer_set_abs (&t1, 5, 10);
692	evtimer_start (&t1);
693
694	struct ev_signal sig;
695	evw_init (&sig, scb, 65535);
696	evsignal_set (&sig, SIGQUIT);
697	evsignal_start (&sig);
698
699	ev_loop (0);
700
701	return 0;	2269	return;
702	}	2270	}
703		2271
704	#endif	2272	once->cb = cb;
		2273	once->arg = arg;
705		2274
		2275	ev_init (&once->io, once_cb_io);
		2276	if (fd >= 0)
		2277	{
		2278	ev_io_set (&once->io, fd, events);
		2279	ev_io_start (EV_A_ &once->io);
		2280	}
706		2281
		2282	ev_init (&once->to, once_cb_to);
		2283	if (timeout >= 0.)
		2284	{
		2285	ev_timer_set (&once->to, timeout, 0.);
		2286	ev_timer_start (EV_A_ &once->to);
		2287	}
		2288	}
707		2289
		2290	#ifdef __cplusplus
		2291	}
		2292	#endif
708		2293

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