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Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.141 by root, Mon Nov 26 20:33:58 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	#endif
		100
1	#include <math.h>	101	#include <math.h>
2	#include <stdlib.h>	102	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	103	#include <fcntl.h>
5	#include <signal.h>	104	#include <stddef.h>
6		105
7	#include <stdio.h>	106	#include <stdio.h>
8		107
9	#include <assert.h>	108	#include <assert.h>
10	#include <errno.h>	109	#include <errno.h>
11	#include <sys/time.h>	110	#include <sys/types.h>
12	#include <time.h>	111	#include <time.h>
13		112
		113	#include <signal.h>
		114
		115	#ifndef _WIN32
		116	# include <sys/time.h>
		117	# include <sys/wait.h>
		118	# include <unistd.h>
		119	#else
		120	# define WIN32_LEAN_AND_MEAN
		121	# include <windows.h>
		122	# ifndef EV_SELECT_IS_WINSOCKET
		123	# define EV_SELECT_IS_WINSOCKET 1
		124	# endif
		125	#endif
		126
		127	/**/
		128
		129	#ifndef EV_USE_MONOTONIC
		130	# define EV_USE_MONOTONIC 0
		131	#endif
		132
		133	#ifndef EV_USE_REALTIME
		134	# define EV_USE_REALTIME 0
		135	#endif
		136
		137	#ifndef EV_USE_SELECT
		138	# define EV_USE_SELECT 1
		139	#endif
		140
		141	#ifndef EV_USE_POLL
		142	# ifdef _WIN32
		143	# define EV_USE_POLL 0
		144	# else
		145	# define EV_USE_POLL 1
		146	# endif
		147	#endif
		148
		149	#ifndef EV_USE_EPOLL
		150	# define EV_USE_EPOLL 0
		151	#endif
		152
		153	#ifndef EV_USE_KQUEUE
		154	# define EV_USE_KQUEUE 0
		155	#endif
		156
		157	#ifndef EV_USE_PORT
		158	# define EV_USE_PORT 0
		159	#endif
		160
		161	/**/
		162
14	#ifdef CLOCK_MONOTONIC	163	#ifndef CLOCK_MONOTONIC
		164	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	165	# define EV_USE_MONOTONIC 0
16	#endif	166	#endif
17		167
		168	#ifndef CLOCK_REALTIME
		169	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	170	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	171	#endif
20	#define HAVE_SELECT 1	172
		173	#if EV_SELECT_IS_WINSOCKET
		174	# include <winsock.h>
		175	#endif
		176
		177	/**/
21		178
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	179	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	180	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		181	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		182	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
24		183
		184	#ifdef EV_H
		185	# include EV_H
		186	#else
25	#include "ev.h"	187	# include "ev.h"
		188	#endif
26		189
27	struct ev_watcher {	190	#if __GNUC__ >= 3
28	EV_WATCHER (ev_watcher);	191	# define expect(expr,value) __builtin_expect ((expr),(value))
29	};	192	# define inline_size static inline /* inline for codesize */
		193	# if EV_MINIMAL
		194	# define noinline __attribute__ ((noinline))
		195	# define inline_speed static noinline
		196	# else
		197	# define noinline
		198	# define inline_speed static inline
		199	# endif
		200	#else
		201	# define expect(expr,value) (expr)
		202	# define inline_speed static
		203	# define inline_minimal static
		204	# define noinline
		205	#endif
30		206
31	struct ev_watcher_list {	207	#define expect_false(expr) expect ((expr) != 0, 0)
32	EV_WATCHER_LIST (ev_watcher_list);	208	#define expect_true(expr) expect ((expr) != 0, 1)
33	};
34		209
35	static ev_tstamp now, diff; /* monotonic clock */	210	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		211	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		212
		213	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		214	#define EMPTY2(a,b) /* used to suppress some warnings */
		215
		216	typedef ev_watcher *W;
		217	typedef ev_watcher_list *WL;
		218	typedef ev_watcher_time *WT;
		219
		220	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		221
		222	#ifdef _WIN32
		223	# include "ev_win32.c"
		224	#endif
		225
		226	/*****************************************************************************/
		227
		228	static void (*syserr_cb)(const char *msg);
		229
		230	void
		231	ev_set_syserr_cb (void (*cb)(const char *msg))
		232	{
		233	syserr_cb = cb;
		234	}
		235
		236	static void noinline
		237	syserr (const char *msg)
		238	{
		239	if (!msg)
		240	msg = "(libev) system error";
		241
		242	if (syserr_cb)
		243	syserr_cb (msg);
		244	else
		245	{
		246	perror (msg);
		247	abort ();
		248	}
		249	}
		250
		251	static void *(*alloc)(void *ptr, long size);
		252
		253	void
		254	ev_set_allocator (void *(*cb)(void *ptr, long size))
		255	{
		256	alloc = cb;
		257	}
		258
		259	static void *
		260	ev_realloc (void *ptr, long size)
		261	{
		262	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		263
		264	if (!ptr && size)
		265	{
		266	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		267	abort ();
		268	}
		269
		270	return ptr;
		271	}
		272
		273	#define ev_malloc(size) ev_realloc (0, (size))
		274	#define ev_free(ptr) ev_realloc ((ptr), 0)
		275
		276	/*****************************************************************************/
		277
		278	typedef struct
		279	{
		280	WL head;
		281	unsigned char events;
		282	unsigned char reify;
		283	#if EV_SELECT_IS_WINSOCKET
		284	SOCKET handle;
		285	#endif
		286	} ANFD;
		287
		288	typedef struct
		289	{
		290	W w;
		291	int events;
		292	} ANPENDING;
		293
		294	#if EV_MULTIPLICITY
		295
		296	struct ev_loop
		297	{
		298	ev_tstamp ev_rt_now;
		299	#define ev_rt_now ((loop)->ev_rt_now)
		300	#define VAR(name,decl) decl;
		301	#include "ev_vars.h"
		302	#undef VAR
		303	};
		304	#include "ev_wrap.h"
		305
		306	static struct ev_loop default_loop_struct;
		307	struct ev_loop *ev_default_loop_ptr;
		308
		309	#else
		310
36	ev_tstamp ev_now;	311	ev_tstamp ev_rt_now;
37	int ev_method;	312	#define VAR(name,decl) static decl;
		313	#include "ev_vars.h"
		314	#undef VAR
38		315
39	static int have_monotonic; /* runtime */	316	static int ev_default_loop_ptr;
40		317
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	318	#endif
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		319
45	/*****************************************************************************/	320	/*****************************************************************************/
46		321
47	ev_tstamp	322	ev_tstamp
48	ev_time (void)	323	ev_time (void)
49	{	324	{
50	#if HAVE_REALTIME	325	#if EV_USE_REALTIME
51	struct timespec ts;	326	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	327	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	328	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	329	#else
55	struct timeval tv;	330	struct timeval tv;
56	gettimeofday (&tv, 0);	331	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	332	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	333	#endif
59	}	334	}
60		335
61	static ev_tstamp	336	ev_tstamp inline_size
62	get_clock (void)	337	get_clock (void)
63	{	338	{
64	#if HAVE_MONOTONIC	339	#if EV_USE_MONOTONIC
65	if (have_monotonic)	340	if (expect_true (have_monotonic))
66	{	341	{
67	struct timespec ts;	342	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	343	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	344	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	345	}
71	#endif	346	#endif
72		347
73	return ev_time ();	348	return ev_time ();
74	}	349	}
75		350
		351	#if EV_MULTIPLICITY
		352	ev_tstamp
		353	ev_now (EV_P)
		354	{
		355	return ev_rt_now;
		356	}
		357	#endif
		358
		359	#define array_roundsize(type,n) (((n) | 4) & ~3)
		360
76	#define array_needsize(base,cur,cnt,init) \	361	#define array_needsize(type,base,cur,cnt,init) \
77	if ((cnt) > cur) \	362	if (expect_false ((cnt) > cur)) \
78	{ \	363	{ \
79	int newcnt = cur ? cur << 1 : 16; \	364	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	365	do \
		366	{ \
		367	newcnt = array_roundsize (type, newcnt << 1); \
		368	} \
		369	while ((cnt) > newcnt); \
		370	\
81	base = realloc (base, sizeof (*base) * (newcnt)); \	371	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
82	init (base + cur, newcnt - cur); \	372	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	373	cur = newcnt; \
84	}	374	}
		375
		376	#define array_slim(type,stem) \
		377	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		378	{ \
		379	stem ## max = array_roundsize (stem ## cnt >> 1); \
		380	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		381	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		382	}
		383
		384	#define array_free(stem, idx) \
		385	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
85		386
86	/*****************************************************************************/	387	/*****************************************************************************/
87		388
		389	void noinline
		390	ev_feed_event (EV_P_ void *w, int revents)
		391	{
		392	W w_ = (W)w;
		393
		394	if (expect_false (w_->pending))
		395	{
		396	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		397	return;
		398	}
		399
		400	w_->pending = ++pendingcnt [ABSPRI (w_)];
		401	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
		402	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		403	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		404	}
		405
		406	void inline_size
		407	queue_events (EV_P_ W *events, int eventcnt, int type)
		408	{
		409	int i;
		410
		411	for (i = 0; i < eventcnt; ++i)
		412	ev_feed_event (EV_A_ events [i], type);
		413	}
		414
		415	/*****************************************************************************/
		416
		417	void inline_size
		418	anfds_init (ANFD *base, int count)
		419	{
		420	while (count--)
		421	{
		422	base->head = 0;
		423	base->events = EV_NONE;
		424	base->reify = 0;
		425
		426	++base;
		427	}
		428	}
		429
		430	void inline_speed
		431	fd_event (EV_P_ int fd, int revents)
		432	{
		433	ANFD *anfd = anfds + fd;
		434	ev_io *w;
		435
		436	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		437	{
		438	int ev = w->events & revents;
		439
		440	if (ev)
		441	ev_feed_event (EV_A_ (W)w, ev);
		442	}
		443	}
		444
		445	void
		446	ev_feed_fd_event (EV_P_ int fd, int revents)
		447	{
		448	fd_event (EV_A_ fd, revents);
		449	}
		450
		451	void inline_size
		452	fd_reify (EV_P)
		453	{
		454	int i;
		455
		456	for (i = 0; i < fdchangecnt; ++i)
		457	{
		458	int fd = fdchanges [i];
		459	ANFD *anfd = anfds + fd;
		460	ev_io *w;
		461
		462	int events = 0;
		463
		464	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		465	events |= w->events;
		466
		467	#if EV_SELECT_IS_WINSOCKET
		468	if (events)
		469	{
		470	unsigned long argp;
		471	anfd->handle = _get_osfhandle (fd);
		472	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		473	}
		474	#endif
		475
		476	anfd->reify = 0;
		477
		478	backend_modify (EV_A_ fd, anfd->events, events);
		479	anfd->events = events;
		480	}
		481
		482	fdchangecnt = 0;
		483	}
		484
		485	void inline_size
		486	fd_change (EV_P_ int fd)
		487	{
		488	if (expect_false (anfds [fd].reify))
		489	return;
		490
		491	anfds [fd].reify = 1;
		492
		493	++fdchangecnt;
		494	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		495	fdchanges [fdchangecnt - 1] = fd;
		496	}
		497
		498	void inline_speed
		499	fd_kill (EV_P_ int fd)
		500	{
		501	ev_io *w;
		502
		503	while ((w = (ev_io *)anfds [fd].head))
		504	{
		505	ev_io_stop (EV_A_ w);
		506	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		507	}
		508	}
		509
		510	int inline_size
		511	fd_valid (int fd)
		512	{
		513	#ifdef _WIN32
		514	return _get_osfhandle (fd) != -1;
		515	#else
		516	return fcntl (fd, F_GETFD) != -1;
		517	#endif
		518	}
		519
		520	/* called on EBADF to verify fds */
		521	static void noinline
		522	fd_ebadf (EV_P)
		523	{
		524	int fd;
		525
		526	for (fd = 0; fd < anfdmax; ++fd)
		527	if (anfds [fd].events)
		528	if (!fd_valid (fd) == -1 && errno == EBADF)
		529	fd_kill (EV_A_ fd);
		530	}
		531
		532	/* called on ENOMEM in select/poll to kill some fds and retry */
		533	static void noinline
		534	fd_enomem (EV_P)
		535	{
		536	int fd;
		537
		538	for (fd = anfdmax; fd--; )
		539	if (anfds [fd].events)
		540	{
		541	fd_kill (EV_A_ fd);
		542	return;
		543	}
		544	}
		545
		546	/* usually called after fork if backend needs to re-arm all fds from scratch */
		547	static void noinline
		548	fd_rearm_all (EV_P)
		549	{
		550	int fd;
		551
		552	/* this should be highly optimised to not do anything but set a flag */
		553	for (fd = 0; fd < anfdmax; ++fd)
		554	if (anfds [fd].events)
		555	{
		556	anfds [fd].events = 0;
		557	fd_change (EV_A_ fd);
		558	}
		559	}
		560
		561	/*****************************************************************************/
		562
		563	void inline_speed
		564	upheap (WT *heap, int k)
		565	{
		566	WT w = heap [k];
		567
		568	while (k && heap [k >> 1]->at > w->at)
		569	{
		570	heap [k] = heap [k >> 1];
		571	((W)heap [k])->active = k + 1;
		572	k >>= 1;
		573	}
		574
		575	heap [k] = w;
		576	((W)heap [k])->active = k + 1;
		577
		578	}
		579
		580	void inline_speed
		581	downheap (WT *heap, int N, int k)
		582	{
		583	WT w = heap [k];
		584
		585	while (k < (N >> 1))
		586	{
		587	int j = k << 1;
		588
		589	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		590	++j;
		591
		592	if (w->at <= heap [j]->at)
		593	break;
		594
		595	heap [k] = heap [j];
		596	((W)heap [k])->active = k + 1;
		597	k = j;
		598	}
		599
		600	heap [k] = w;
		601	((W)heap [k])->active = k + 1;
		602	}
		603
		604	void inline_size
		605	adjustheap (WT *heap, int N, int k)
		606	{
		607	upheap (heap, k);
		608	downheap (heap, N, k);
		609	}
		610
		611	/*****************************************************************************/
		612
88	typedef struct	613	typedef struct
89	{	614	{
90	struct ev_io *head;	615	WL head;
91	unsigned char wev, rev; /* want, received event set */
92	} ANFD;
93
94	static ANFD *anfds;
95	static int anfdmax;
96
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void
101	anfds_init (ANFD *base, int count)
102	{
103	while (count--)
104	{
105	base->head = 0;
106	base->wev = base->rev = EV_NONE;
107	++base;
108	}
109	}
110
111	typedef struct
112	{
113	struct ev_watcher *w;
114	int events;
115	} ANPENDING;
116
117	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;
119
120	static void
121	event (struct ev_watcher *w, int events)
122	{
123	w->pending = ++pendingcnt;
124	array_needsize (pendings, pendingmax, pendingcnt, );
125	pendings [pendingcnt - 1].w = w;
126	pendings [pendingcnt - 1].events = events;
127	}
128
129	static void
130	fd_event (int fd, int events)
131	{
132	ANFD *anfd = anfds + fd;
133	struct ev_io *w;
134
135	for (w = anfd->head; w; w = w->next)
136	{
137	int ev = w->events & events;
138
139	if (ev)
140	event ((struct ev_watcher *)w, ev);
141	}
142	}
143
144	static void
145	queue_events (struct ev_watcher **events, int eventcnt, int type)
146	{
147	int i;
148
149	for (i = 0; i < eventcnt; ++i)
150	event (events [i], type);
151	}
152
153	/*****************************************************************************/
154
155	static struct ev_timer **atimers;
156	static int atimermax, atimercnt;
157
158	static struct ev_timer **rtimers;
159	static int rtimermax, rtimercnt;
160
161	static void
162	upheap (struct ev_timer **timers, int k)
163	{
164	struct ev_timer *w = timers [k];
165
166	while (k && timers [k >> 1]->at > w->at)
167	{
168	timers [k] = timers [k >> 1];
169	timers [k]->active = k + 1;
170	k >>= 1;
171	}
172
173	timers [k] = w;
174	timers [k]->active = k + 1;
175
176	}
177
178	static void
179	downheap (struct ev_timer **timers, int N, int k)
180	{
181	struct ev_timer *w = timers [k];
182
183	while (k < (N >> 1))
184	{
185	int j = k << 1;
186
187	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
188	++j;
189
190	if (w->at <= timers [j]->at)
191	break;
192
193	timers [k] = timers [j];
194	timers [k]->active = k + 1;
195	k = j;
196	}
197
198	timers [k] = w;
199	timers [k]->active = k + 1;
200	}
201
202	/*****************************************************************************/
203
204	typedef struct
205	{
206	struct ev_signal *head;
207	sig_atomic_t gotsig;	616	sig_atomic_t volatile gotsig;
208	} ANSIG;	617	} ANSIG;
209		618
210	static ANSIG *signals;	619	static ANSIG *signals;
211	static int signalmax;	620	static int signalmax;
212		621
213	static int sigpipe [2];	622	static int sigpipe [2];
214	static sig_atomic_t gotsig;	623	static sig_atomic_t volatile gotsig;
215	static struct ev_io sigev;	624	static ev_io sigev;
216		625
217	static void	626	void inline_size
218	signals_init (ANSIG *base, int count)	627	signals_init (ANSIG *base, int count)
219	{	628	{
220	while (count--)	629	while (count--)
221	{	630	{
222	base->head = 0;	631	base->head = 0;
223	base->gotsig = 0;	632	base->gotsig = 0;
		633
224	++base;	634	++base;
225	}	635	}
226	}	636	}
227		637
228	static void	638	static void
229	sighandler (int signum)	639	sighandler (int signum)
230	{	640	{
		641	#if _WIN32
		642	signal (signum, sighandler);
		643	#endif
		644
231	signals [signum - 1].gotsig = 1;	645	signals [signum - 1].gotsig = 1;
232		646
233	if (!gotsig)	647	if (!gotsig)
234	{	648	{
		649	int old_errno = errno;
235	gotsig = 1;	650	gotsig = 1;
236	write (sigpipe [1], &gotsig, 1);	651	write (sigpipe [1], &signum, 1);
		652	errno = old_errno;
237	}	653	}
		654	}
		655
		656	void noinline
		657	ev_feed_signal_event (EV_P_ int signum)
		658	{
		659	WL w;
		660
		661	#if EV_MULTIPLICITY
		662	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		663	#endif
		664
		665	--signum;
		666
		667	if (signum < 0 || signum >= signalmax)
		668	return;
		669
		670	signals [signum].gotsig = 0;
		671
		672	for (w = signals [signum].head; w; w = w->next)
		673	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
238	}	674	}
239		675
240	static void	676	static void
241	sigcb (struct ev_io *iow, int revents)	677	sigcb (EV_P_ ev_io *iow, int revents)
242	{	678	{
243	struct ev_signal *w;
244	int sig;	679	int signum;
245		680
		681	read (sigpipe [0], &revents, 1);
246	gotsig = 0;	682	gotsig = 0;
247	read (sigpipe [0], &revents, 1);
248		683
249	for (sig = signalmax; sig--; )	684	for (signum = signalmax; signum--; )
250	if (signals [sig].gotsig)	685	if (signals [signum].gotsig)
		686	ev_feed_signal_event (EV_A_ signum + 1);
		687	}
		688
		689	void inline_size
		690	fd_intern (int fd)
		691	{
		692	#ifdef _WIN32
		693	int arg = 1;
		694	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		695	#else
		696	fcntl (fd, F_SETFD, FD_CLOEXEC);
		697	fcntl (fd, F_SETFL, O_NONBLOCK);
		698	#endif
		699	}
		700
		701	static void noinline
		702	siginit (EV_P)
		703	{
		704	fd_intern (sigpipe [0]);
		705	fd_intern (sigpipe [1]);
		706
		707	ev_io_set (&sigev, sigpipe [0], EV_READ);
		708	ev_io_start (EV_A_ &sigev);
		709	ev_unref (EV_A); /* child watcher should not keep loop alive */
		710	}
		711
		712	/*****************************************************************************/
		713
		714	static ev_child *childs [PID_HASHSIZE];
		715
		716	#ifndef _WIN32
		717
		718	static ev_signal childev;
		719
		720	#ifndef WCONTINUED
		721	# define WCONTINUED 0
		722	#endif
		723
		724	void inline_speed
		725	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		726	{
		727	ev_child *w;
		728
		729	for (w = (ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		730	if (w->pid == pid || !w->pid)
251	{	731	{
252	signals [sig].gotsig = 0;	732	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
253		733	w->rpid = pid;
254	for (w = signals [sig].head; w; w = w->next)	734	w->rstatus = status;
255	event ((struct ev_watcher *)w, EV_SIGNAL);	735	ev_feed_event (EV_A_ (W)w, EV_CHILD);
256	}	736	}
257	}	737	}
258		738
259	static void	739	static void
260	siginit (void)	740	childcb (EV_P_ ev_signal *sw, int revents)
261	{	741	{
262	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	742	int pid, status;
263	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
264		743
265	/* rather than sort out wether we really need nb, set it */	744	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
266	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	745	{
267	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	746	/* make sure we are called again until all childs have been reaped */
		747	/* we need to do it this way so that the callback gets called before we continue */
		748	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
268		749
269	evio_set (&sigev, sigpipe [0], EV_READ);	750	child_reap (EV_A_ sw, pid, pid, status);
270	evio_start (&sigev);	751	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		752	}
271	}	753	}
		754
		755	#endif
272		756
273	/*****************************************************************************/	757	/*****************************************************************************/
274		758
275	static struct ev_idle **idles;	759	#if EV_USE_PORT
276	static int idlemax, idlecnt;	760	# include "ev_port.c"
		761	#endif
		762	#if EV_USE_KQUEUE
		763	# include "ev_kqueue.c"
		764	#endif
		765	#if EV_USE_EPOLL
		766	# include "ev_epoll.c"
		767	#endif
		768	#if EV_USE_POLL
		769	# include "ev_poll.c"
		770	#endif
		771	#if EV_USE_SELECT
		772	# include "ev_select.c"
		773	#endif
277		774
278	static struct ev_check **checks;	775	int
279	static int checkmax, checkcnt;	776	ev_version_major (void)
		777	{
		778	return EV_VERSION_MAJOR;
		779	}
		780
		781	int
		782	ev_version_minor (void)
		783	{
		784	return EV_VERSION_MINOR;
		785	}
		786
		787	/* return true if we are running with elevated privileges and should ignore env variables */
		788	int inline_size
		789	enable_secure (void)
		790	{
		791	#ifdef _WIN32
		792	return 0;
		793	#else
		794	return getuid () != geteuid ()
		795	|| getgid () != getegid ();
		796	#endif
		797	}
		798
		799	unsigned int
		800	ev_supported_backends (void)
		801	{
		802	unsigned int flags = 0;
		803
		804	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		805	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		806	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		807	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		808	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		809
		810	return flags;
		811	}
		812
		813	unsigned int
		814	ev_recommended_backends (void)
		815	{
		816	unsigned int flags = ev_supported_backends ();
		817
		818	#ifndef __NetBSD__
		819	/* kqueue is borked on everything but netbsd apparently */
		820	/* it usually doesn't work correctly on anything but sockets and pipes */
		821	flags &= ~EVBACKEND_KQUEUE;
		822	#endif
		823	#ifdef __APPLE__
		824	// flags &= ~EVBACKEND_KQUEUE; for documentation
		825	flags &= ~EVBACKEND_POLL;
		826	#endif
		827
		828	return flags;
		829	}
		830
		831	unsigned int
		832	ev_embeddable_backends (void)
		833	{
		834	return EVBACKEND_EPOLL
		835	| EVBACKEND_KQUEUE
		836	| EVBACKEND_PORT;
		837	}
		838
		839	unsigned int
		840	ev_backend (EV_P)
		841	{
		842	return backend;
		843	}
		844
		845	static void
		846	loop_init (EV_P_ unsigned int flags)
		847	{
		848	if (!backend)
		849	{
		850	#if EV_USE_MONOTONIC
		851	{
		852	struct timespec ts;
		853	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		854	have_monotonic = 1;
		855	}
		856	#endif
		857
		858	ev_rt_now = ev_time ();
		859	mn_now = get_clock ();
		860	now_floor = mn_now;
		861	rtmn_diff = ev_rt_now - mn_now;
		862
		863	if (!(flags & EVFLAG_NOENV)
		864	&& !enable_secure ()
		865	&& getenv ("LIBEV_FLAGS"))
		866	flags = atoi (getenv ("LIBEV_FLAGS"));
		867
		868	if (!(flags & 0x0000ffffUL))
		869	flags |= ev_recommended_backends ();
		870
		871	backend = 0;
		872	#if EV_USE_PORT
		873	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		874	#endif
		875	#if EV_USE_KQUEUE
		876	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		877	#endif
		878	#if EV_USE_EPOLL
		879	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		880	#endif
		881	#if EV_USE_POLL
		882	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		883	#endif
		884	#if EV_USE_SELECT
		885	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		886	#endif
		887
		888	ev_init (&sigev, sigcb);
		889	ev_set_priority (&sigev, EV_MAXPRI);
		890	}
		891	}
		892
		893	static void
		894	loop_destroy (EV_P)
		895	{
		896	int i;
		897
		898	#if EV_USE_PORT
		899	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		900	#endif
		901	#if EV_USE_KQUEUE
		902	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		903	#endif
		904	#if EV_USE_EPOLL
		905	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		906	#endif
		907	#if EV_USE_POLL
		908	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		909	#endif
		910	#if EV_USE_SELECT
		911	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		912	#endif
		913
		914	for (i = NUMPRI; i--; )
		915	array_free (pending, [i]);
		916
		917	/* have to use the microsoft-never-gets-it-right macro */
		918	array_free (fdchange, EMPTY0);
		919	array_free (timer, EMPTY0);
		920	#if EV_PERIODIC_ENABLE
		921	array_free (periodic, EMPTY0);
		922	#endif
		923	array_free (idle, EMPTY0);
		924	array_free (prepare, EMPTY0);
		925	array_free (check, EMPTY0);
		926
		927	backend = 0;
		928	}
		929
		930	static void
		931	loop_fork (EV_P)
		932	{
		933	#if EV_USE_PORT
		934	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		935	#endif
		936	#if EV_USE_KQUEUE
		937	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		938	#endif
		939	#if EV_USE_EPOLL
		940	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		941	#endif
		942
		943	if (ev_is_active (&sigev))
		944	{
		945	/* default loop */
		946
		947	ev_ref (EV_A);
		948	ev_io_stop (EV_A_ &sigev);
		949	close (sigpipe [0]);
		950	close (sigpipe [1]);
		951
		952	while (pipe (sigpipe))
		953	syserr ("(libev) error creating pipe");
		954
		955	siginit (EV_A);
		956	}
		957
		958	postfork = 0;
		959	}
		960
		961	#if EV_MULTIPLICITY
		962	struct ev_loop *
		963	ev_loop_new (unsigned int flags)
		964	{
		965	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		966
		967	memset (loop, 0, sizeof (struct ev_loop));
		968
		969	loop_init (EV_A_ flags);
		970
		971	if (ev_backend (EV_A))
		972	return loop;
		973
		974	return 0;
		975	}
		976
		977	void
		978	ev_loop_destroy (EV_P)
		979	{
		980	loop_destroy (EV_A);
		981	ev_free (loop);
		982	}
		983
		984	void
		985	ev_loop_fork (EV_P)
		986	{
		987	postfork = 1;
		988	}
		989
		990	#endif
		991
		992	#if EV_MULTIPLICITY
		993	struct ev_loop *
		994	ev_default_loop_init (unsigned int flags)
		995	#else
		996	int
		997	ev_default_loop (unsigned int flags)
		998	#endif
		999	{
		1000	if (sigpipe [0] == sigpipe [1])
		1001	if (pipe (sigpipe))
		1002	return 0;
		1003
		1004	if (!ev_default_loop_ptr)
		1005	{
		1006	#if EV_MULTIPLICITY
		1007	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1008	#else
		1009	ev_default_loop_ptr = 1;
		1010	#endif
		1011
		1012	loop_init (EV_A_ flags);
		1013
		1014	if (ev_backend (EV_A))
		1015	{
		1016	siginit (EV_A);
		1017
		1018	#ifndef _WIN32
		1019	ev_signal_init (&childev, childcb, SIGCHLD);
		1020	ev_set_priority (&childev, EV_MAXPRI);
		1021	ev_signal_start (EV_A_ &childev);
		1022	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1023	#endif
		1024	}
		1025	else
		1026	ev_default_loop_ptr = 0;
		1027	}
		1028
		1029	return ev_default_loop_ptr;
		1030	}
		1031
		1032	void
		1033	ev_default_destroy (void)
		1034	{
		1035	#if EV_MULTIPLICITY
		1036	struct ev_loop *loop = ev_default_loop_ptr;
		1037	#endif
		1038
		1039	#ifndef _WIN32
		1040	ev_ref (EV_A); /* child watcher */
		1041	ev_signal_stop (EV_A_ &childev);
		1042	#endif
		1043
		1044	ev_ref (EV_A); /* signal watcher */
		1045	ev_io_stop (EV_A_ &sigev);
		1046
		1047	close (sigpipe [0]); sigpipe [0] = 0;
		1048	close (sigpipe [1]); sigpipe [1] = 0;
		1049
		1050	loop_destroy (EV_A);
		1051	}
		1052
		1053	void
		1054	ev_default_fork (void)
		1055	{
		1056	#if EV_MULTIPLICITY
		1057	struct ev_loop *loop = ev_default_loop_ptr;
		1058	#endif
		1059
		1060	if (backend)
		1061	postfork = 1;
		1062	}
280		1063
281	/*****************************************************************************/	1064	/*****************************************************************************/
282		1065
283	#if HAVE_EPOLL	1066	int inline_size
284	# include "ev_epoll.c"	1067	any_pending (EV_P)
285	#endif
286	#if HAVE_SELECT
287	# include "ev_select.c"
288	#endif
289
290	int ev_init (int flags)
291	{	1068	{
292	#if HAVE_MONOTONIC	1069	int pri;
293	{
294	struct timespec ts;
295	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296	have_monotonic = 1;
297	}
298	#endif
299		1070
300	ev_now = ev_time ();	1071	for (pri = NUMPRI; pri--; )
301	now = get_clock ();	1072	if (pendingcnt [pri])
302	diff = ev_now - now;	1073	return 1;
303		1074
304	if (pipe (sigpipe))
305	return 0;	1075	return 0;
306
307	ev_method = EVMETHOD_NONE;
308	#if HAVE_EPOLL
309	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
310	#endif
311	#if HAVE_SELECT
312	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	#endif
314
315	if (ev_method)
316	{
317	evw_init (&sigev, sigcb, 0);
318	siginit ();
319	}
320
321	return ev_method;
322	}	1076	}
323		1077
324	/*****************************************************************************/	1078	void inline_speed
325		1079	call_pending (EV_P)
326	void ev_prefork (void)
327	{	1080	{
328	}
329
330	void ev_postfork_parent (void)
331	{
332	}
333
334	void ev_postfork_child (void)
335	{
336	#if HAVE_EPOLL
337	if (ev_method == EVMETHOD_EPOLL)
338	epoll_postfork_child ();
339	#endif
340
341	evio_stop (&sigev);
342	close (sigpipe [0]);
343	close (sigpipe [1]);
344	pipe (sigpipe);
345	siginit ();
346	}
347
348	/*****************************************************************************/
349
350	static void
351	fd_reify (void)
352	{
353	int i;	1081	int pri;
354		1082
355	for (i = 0; i < fdchangecnt; ++i)	1083	for (pri = NUMPRI; pri--; )
		1084	while (pendingcnt [pri])
356	{	1085	{
357	int fd = fdchanges [i];	1086	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
358	ANFD *anfd = anfds + fd;
359	struct ev_io *w;
360		1087
361	int wev = 0;	1088	if (expect_true (p->w))
362
363	for (w = anfd->head; w; w = w->next)
364	wev |= w->events;
365
366	if (anfd->wev != wev)
367	{	1089	{
368	method_modify (fd, anfd->wev, wev);	1090	assert (("non-pending watcher on pending list", p->w->pending));
369	anfd->wev = wev;
370	}
371	}
372		1091
373	fdchangecnt = 0;
374	}
375
376	static void
377	call_pending ()
378	{
379	int i;
380
381	for (i = 0; i < pendingcnt; ++i)
382	{
383	ANPENDING *p = pendings + i;
384
385	if (p->w)
386	{
387	p->w->pending = 0;	1092	p->w->pending = 0;
388	p->w->cb (p->w, p->events);	1093	EV_CB_INVOKE (p->w, p->events);
389	}	1094	}
390	}	1095	}
391
392	pendingcnt = 0;
393	}	1096	}
394		1097
395	static void	1098	void inline_size
396	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1099	timers_reify (EV_P)
397	{	1100	{
398	while (timercnt && timers [0]->at <= now)	1101	while (timercnt && ((WT)timers [0])->at <= mn_now)
399	{	1102	{
400	struct ev_timer *w = timers [0];	1103	ev_timer *w = timers [0];
		1104
		1105	assert (("inactive timer on timer heap detected", ev_is_active (w)));
401		1106
402	/* first reschedule or stop timer */	1107	/* first reschedule or stop timer */
403	if (w->repeat)	1108	if (w->repeat)
404	{	1109	{
405	if (w->is_abs)	1110	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
406	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1111
407	else
408	w->at = now + w->repeat;	1112	((WT)w)->at += w->repeat;
		1113	if (((WT)w)->at < mn_now)
		1114	((WT)w)->at = mn_now;
409		1115
410	assert (w->at > now);
411
412	downheap (timers, timercnt, 0);	1116	downheap ((WT *)timers, timercnt, 0);
413	}	1117	}
414	else	1118	else
		1119	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1120
		1121	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1122	}
		1123	}
		1124
		1125	#if EV_PERIODIC_ENABLE
		1126	void inline_size
		1127	periodics_reify (EV_P)
		1128	{
		1129	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1130	{
		1131	ev_periodic *w = periodics [0];
		1132
		1133	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1134
		1135	/* first reschedule or stop timer */
		1136	if (w->reschedule_cb)
415	{	1137	{
416	evtimer_stop (w); /* nonrepeating: stop timer */	1138	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
417	--timercnt; /* maybe pass by reference instead? */	1139	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1140	downheap ((WT *)periodics, periodiccnt, 0);
418	}	1141	}
		1142	else if (w->interval)
		1143	{
		1144	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1145	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1146	downheap ((WT *)periodics, periodiccnt, 0);
		1147	}
		1148	else
		1149	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
419		1150
420	event ((struct ev_watcher *)w, EV_TIMEOUT);	1151	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
421	}	1152	}
422	}	1153	}
423		1154
424	static void	1155	static void noinline
425	time_update ()	1156	periodics_reschedule (EV_P)
426	{	1157	{
427	int i;	1158	int i;
		1159
		1160	/* adjust periodics after time jump */
		1161	for (i = 0; i < periodiccnt; ++i)
		1162	{
		1163	ev_periodic *w = periodics [i];
		1164
		1165	if (w->reschedule_cb)
		1166	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1167	else if (w->interval)
		1168	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1169	}
		1170
		1171	/* now rebuild the heap */
		1172	for (i = periodiccnt >> 1; i--; )
		1173	downheap ((WT *)periodics, periodiccnt, i);
		1174	}
		1175	#endif
		1176
		1177	int inline_size
		1178	time_update_monotonic (EV_P)
		1179	{
		1180	mn_now = get_clock ();
		1181
		1182	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1183	{
		1184	ev_rt_now = rtmn_diff + mn_now;
		1185	return 0;
		1186	}
		1187	else
		1188	{
		1189	now_floor = mn_now;
428	ev_now = ev_time ();	1190	ev_rt_now = ev_time ();
429		1191	return 1;
430	if (have_monotonic)
431	{	1192	}
432	ev_tstamp odiff = diff;	1193	}
433		1194
434	/* detecting time jumps is much more difficult */	1195	void inline_size
435	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1196	time_update (EV_P)
		1197	{
		1198	int i;
		1199
		1200	#if EV_USE_MONOTONIC
		1201	if (expect_true (have_monotonic))
		1202	{
		1203	if (time_update_monotonic (EV_A))
436	{	1204	{
437	now = get_clock ();	1205	ev_tstamp odiff = rtmn_diff;
		1206
		1207	/* loop a few times, before making important decisions.
		1208	* on the choice of "4": one iteration isn't enough,
		1209	* in case we get preempted during the calls to
		1210	* ev_time and get_clock. a second call is almost guarenteed
		1211	* to succeed in that case, though. and looping a few more times
		1212	* doesn't hurt either as we only do this on time-jumps or
		1213	* in the unlikely event of getting preempted here.
		1214	*/
		1215	for (i = 4; --i; )
		1216	{
438	diff = ev_now - now;	1217	rtmn_diff = ev_rt_now - mn_now;
439		1218
440	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1219	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
441	return; /* all is well */	1220	return; /* all is well */
442		1221
443	ev_now = ev_time ();	1222	ev_rt_now = ev_time ();
		1223	mn_now = get_clock ();
		1224	now_floor = mn_now;
		1225	}
		1226
		1227	# if EV_PERIODIC_ENABLE
		1228	periodics_reschedule (EV_A);
		1229	# endif
		1230	/* no timer adjustment, as the monotonic clock doesn't jump */
		1231	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
444	}	1232	}
		1233	}
		1234	else
		1235	#endif
		1236	{
		1237	ev_rt_now = ev_time ();
445		1238
446	/* time jump detected, reschedule atimers */	1239	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
447	for (i = 0; i < atimercnt; ++i)
448	{	1240	{
449	struct ev_timer *w = atimers [i];	1241	#if EV_PERIODIC_ENABLE
450	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1242	periodics_reschedule (EV_A);
		1243	#endif
		1244
		1245	/* adjust timers. this is easy, as the offset is the same for all */
		1246	for (i = 0; i < timercnt; ++i)
		1247	((WT)timers [i])->at += ev_rt_now - mn_now;
451	}	1248	}
452	}
453	else
454	{
455	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
456	/* time jump detected, adjust rtimers */
457	for (i = 0; i < rtimercnt; ++i)
458	rtimers [i]->at += ev_now - now;
459		1249
460	now = ev_now;	1250	mn_now = ev_rt_now;
461	}
462	}
463
464	int ev_loop_done;
465
466	void ev_loop (int flags)
467	{
468	double block;
469	ev_loop_done = flags & EVLOOP_ONESHOT;
470
471	if (checkcnt)
472	{	1251	}
473	queue_events (checks, checkcnt, EV_CHECK);	1252	}
		1253
		1254	void
		1255	ev_ref (EV_P)
		1256	{
		1257	++activecnt;
		1258	}
		1259
		1260	void
		1261	ev_unref (EV_P)
		1262	{
		1263	--activecnt;
		1264	}
		1265
		1266	static int loop_done;
		1267
		1268	void
		1269	ev_loop (EV_P_ int flags)
		1270	{
		1271	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1272	? EVUNLOOP_ONE
		1273	: EVUNLOOP_CANCEL;
		1274
		1275	while (activecnt)
		1276	{
		1277	/* queue check watchers (and execute them) */
		1278	if (expect_false (preparecnt))
		1279	{
		1280	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
474	call_pending ();	1281	call_pending (EV_A);
475	}	1282	}
476		1283
477	do	1284	/* we might have forked, so reify kernel state if necessary */
478	{	1285	if (expect_false (postfork))
		1286	loop_fork (EV_A);
		1287
479	/* update fd-related kernel structures */	1288	/* update fd-related kernel structures */
480	fd_reify ();	1289	fd_reify (EV_A);
481		1290
482	/* calculate blocking time */	1291	/* calculate blocking time */
		1292	{
		1293	double block;
		1294
483	if (flags & EVLOOP_NONBLOCK || idlecnt)	1295	if (flags & EVLOOP_NONBLOCK || idlecnt)
484	block = 0.;	1296	block = 0.; /* do not block at all */
485	else	1297	else
486	{	1298	{
		1299	/* update time to cancel out callback processing overhead */
		1300	#if EV_USE_MONOTONIC
		1301	if (expect_true (have_monotonic))
		1302	time_update_monotonic (EV_A);
		1303	else
		1304	#endif
		1305	{
		1306	ev_rt_now = ev_time ();
		1307	mn_now = ev_rt_now;
		1308	}
		1309
487	block = MAX_BLOCKTIME;	1310	block = MAX_BLOCKTIME;
488		1311
489	if (rtimercnt)	1312	if (timercnt)
490	{	1313	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1314	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
492	if (block > to) block = to;	1315	if (block > to) block = to;
493	}	1316	}
494		1317
		1318	#if EV_PERIODIC_ENABLE
495	if (atimercnt)	1319	if (periodiccnt)
496	{	1320	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1321	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
498	if (block > to) block = to;	1322	if (block > to) block = to;
499	}	1323	}
		1324	#endif
500		1325
501	if (block < 0.) block = 0.;	1326	if (expect_false (block < 0.)) block = 0.;
502	}	1327	}
503		1328
504	method_poll (block);	1329	backend_poll (EV_A_ block);
		1330	}
505		1331
506	/* update ev_now, do magic */	1332	/* update ev_rt_now, do magic */
507	time_update ();	1333	time_update (EV_A);
508		1334
509	/* queue pending timers and reschedule them */	1335	/* queue pending timers and reschedule them */
510	/* absolute timers first */	1336	timers_reify (EV_A); /* relative timers called last */
511	timers_reify (atimers, atimercnt, ev_now);	1337	#if EV_PERIODIC_ENABLE
512	/* relative timers second */	1338	periodics_reify (EV_A); /* absolute timers called first */
513	timers_reify (rtimers, rtimercnt, now);	1339	#endif
514		1340
515	/* queue idle watchers unless io or timers are pending */	1341	/* queue idle watchers unless other events are pending */
516	if (!pendingcnt)	1342	if (idlecnt && !any_pending (EV_A))
517	queue_events (idles, idlecnt, EV_IDLE);	1343	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
518		1344
519	/* queue check and possibly idle watchers */	1345	/* queue check watchers, to be executed first */
		1346	if (expect_false (checkcnt))
520	queue_events (checks, checkcnt, EV_CHECK);	1347	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
521		1348
522	call_pending ();	1349	call_pending (EV_A);
		1350
		1351	if (expect_false (loop_done))
		1352	break;
523	}	1353	}
524	while (!ev_loop_done);	1354
		1355	if (loop_done == EVUNLOOP_ONE)
		1356	loop_done = EVUNLOOP_CANCEL;
		1357	}
		1358
		1359	void
		1360	ev_unloop (EV_P_ int how)
		1361	{
		1362	loop_done = how;
525	}	1363	}
526		1364
527	/*****************************************************************************/	1365	/*****************************************************************************/
528		1366
529	static void	1367	void inline_size
530	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1368	wlist_add (WL *head, WL elem)
531	{	1369	{
532	elem->next = *head;	1370	elem->next = *head;
533	*head = elem;	1371	*head = elem;
534	}	1372	}
535		1373
536	static void	1374	void inline_size
537	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1375	wlist_del (WL *head, WL elem)
538	{	1376	{
539	while (*head)	1377	while (*head)
540	{	1378	{
541	if (*head == elem)	1379	if (*head == elem)
542	{	1380	{
…		…
546		1384
547	head = &(*head)->next;	1385	head = &(*head)->next;
548	}	1386	}
549	}	1387	}
550		1388
551	static void	1389	void inline_speed
552	ev_start (struct ev_watcher *w, int active)	1390	ev_clear_pending (EV_P_ W w)
553	{	1391	{
		1392	if (w->pending)
		1393	{
		1394	pendings [ABSPRI (w)][w->pending - 1].w = 0;
554	w->pending = 0;	1395	w->pending = 0;
		1396	}
		1397	}
		1398
		1399	void inline_speed
		1400	ev_start (EV_P_ W w, int active)
		1401	{
		1402	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1403	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1404
555	w->active = active;	1405	w->active = active;
		1406	ev_ref (EV_A);
556	}	1407	}
557		1408
558	static void	1409	void inline_size
559	ev_stop (struct ev_watcher *w)	1410	ev_stop (EV_P_ W w)
560	{	1411	{
561	if (w->pending)	1412	ev_unref (EV_A);
562	pendings [w->pending - 1].w = 0;
563
564	w->active = 0;	1413	w->active = 0;
565	/* nop */
566	}	1414	}
567		1415
568	/*****************************************************************************/	1416	/*****************************************************************************/
569		1417
570	void	1418	void
571	evio_start (struct ev_io *w)	1419	ev_io_start (EV_P_ ev_io *w)
		1420	{
		1421	int fd = w->fd;
		1422
		1423	if (expect_false (ev_is_active (w)))
		1424	return;
		1425
		1426	assert (("ev_io_start called with negative fd", fd >= 0));
		1427
		1428	ev_start (EV_A_ (W)w, 1);
		1429	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1430	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1431
		1432	fd_change (EV_A_ fd);
		1433	}
		1434
		1435	void
		1436	ev_io_stop (EV_P_ ev_io *w)
		1437	{
		1438	ev_clear_pending (EV_A_ (W)w);
		1439	if (expect_false (!ev_is_active (w)))
		1440	return;
		1441
		1442	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1443
		1444	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1445	ev_stop (EV_A_ (W)w);
		1446
		1447	fd_change (EV_A_ w->fd);
		1448	}
		1449
		1450	void
		1451	ev_timer_start (EV_P_ ev_timer *w)
		1452	{
		1453	if (expect_false (ev_is_active (w)))
		1454	return;
		1455
		1456	((WT)w)->at += mn_now;
		1457
		1458	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1459
		1460	ev_start (EV_A_ (W)w, ++timercnt);
		1461	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1462	timers [timercnt - 1] = w;
		1463	upheap ((WT *)timers, timercnt - 1);
		1464
		1465	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1466	}
		1467
		1468	void
		1469	ev_timer_stop (EV_P_ ev_timer *w)
		1470	{
		1471	ev_clear_pending (EV_A_ (W)w);
		1472	if (expect_false (!ev_is_active (w)))
		1473	return;
		1474
		1475	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1476
		1477	if (expect_true (((W)w)->active < timercnt--))
		1478	{
		1479	timers [((W)w)->active - 1] = timers [timercnt];
		1480	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1481	}
		1482
		1483	((WT)w)->at -= mn_now;
		1484
		1485	ev_stop (EV_A_ (W)w);
		1486	}
		1487
		1488	void
		1489	ev_timer_again (EV_P_ ev_timer *w)
572	{	1490	{
573	if (ev_is_active (w))	1491	if (ev_is_active (w))
574	return;
575
576	int fd = w->fd;
577
578	ev_start ((struct ev_watcher *)w, 1);
579	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
580	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
581
582	++fdchangecnt;
583	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584	fdchanges [fdchangecnt - 1] = fd;
585	}
586
587	void
588	evio_stop (struct ev_io *w)
589	{
590	if (!ev_is_active (w))
591	return;
592
593	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
594	ev_stop ((struct ev_watcher *)w);
595
596	++fdchangecnt;
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = w->fd;
599	}
600
601	void
602	evtimer_start (struct ev_timer *w)
603	{
604	if (ev_is_active (w))
605	return;
606
607	if (w->is_abs)
608	{	1492	{
609	/* this formula differs from the one in timer_reify becuse we do not round up */
610	if (w->repeat)	1493	if (w->repeat)
611	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
612
613	ev_start ((struct ev_watcher *)w, ++atimercnt);
614	array_needsize (atimers, atimermax, atimercnt, );
615	atimers [atimercnt - 1] = w;
616	upheap (atimers, atimercnt - 1);
617	}
618	else
619	{
620	w->at += now;
621
622	ev_start ((struct ev_watcher *)w, ++rtimercnt);
623	array_needsize (rtimers, rtimermax, rtimercnt, );
624	rtimers [rtimercnt - 1] = w;
625	upheap (rtimers, rtimercnt - 1);
626	}
627
628	}
629
630	void
631	evtimer_stop (struct ev_timer *w)
632	{
633	if (!ev_is_active (w))
634	return;
635
636	if (w->is_abs)
637	{
638	if (w->active < atimercnt--)
639	{	1494	{
640	atimers [w->active - 1] = atimers [atimercnt];	1495	((WT)w)->at = mn_now + w->repeat;
641	downheap (atimers, atimercnt, w->active - 1);	1496	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
642	}	1497	}
643	}
644	else	1498	else
		1499	ev_timer_stop (EV_A_ w);
645	{	1500	}
646	if (w->active < rtimercnt--)	1501	else if (w->repeat)
647	{
648	rtimers [w->active - 1] = rtimers [rtimercnt];
649	downheap (rtimers, rtimercnt, w->active - 1);
650	}
651	}	1502	{
652		1503	w->at = w->repeat;
653	ev_stop ((struct ev_watcher *)w);	1504	ev_timer_start (EV_A_ w);
		1505	}
654	}	1506	}
655		1507
		1508	#if EV_PERIODIC_ENABLE
656	void	1509	void
		1510	ev_periodic_start (EV_P_ ev_periodic *w)
		1511	{
		1512	if (expect_false (ev_is_active (w)))
		1513	return;
		1514
		1515	if (w->reschedule_cb)
		1516	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1517	else if (w->interval)
		1518	{
		1519	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1520	/* this formula differs from the one in periodic_reify because we do not always round up */
		1521	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1522	}
		1523
		1524	ev_start (EV_A_ (W)w, ++periodiccnt);
		1525	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1526	periodics [periodiccnt - 1] = w;
		1527	upheap ((WT *)periodics, periodiccnt - 1);
		1528
		1529	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1530	}
		1531
		1532	void
		1533	ev_periodic_stop (EV_P_ ev_periodic *w)
		1534	{
		1535	ev_clear_pending (EV_A_ (W)w);
		1536	if (expect_false (!ev_is_active (w)))
		1537	return;
		1538
		1539	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1540
		1541	if (expect_true (((W)w)->active < periodiccnt--))
		1542	{
		1543	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1544	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1545	}
		1546
		1547	ev_stop (EV_A_ (W)w);
		1548	}
		1549
		1550	void
		1551	ev_periodic_again (EV_P_ ev_periodic *w)
		1552	{
		1553	/* TODO: use adjustheap and recalculation */
		1554	ev_periodic_stop (EV_A_ w);
		1555	ev_periodic_start (EV_A_ w);
		1556	}
		1557	#endif
		1558
		1559	void
		1560	ev_idle_start (EV_P_ ev_idle *w)
		1561	{
		1562	if (expect_false (ev_is_active (w)))
		1563	return;
		1564
		1565	ev_start (EV_A_ (W)w, ++idlecnt);
		1566	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1567	idles [idlecnt - 1] = w;
		1568	}
		1569
		1570	void
		1571	ev_idle_stop (EV_P_ ev_idle *w)
		1572	{
		1573	ev_clear_pending (EV_A_ (W)w);
		1574	if (expect_false (!ev_is_active (w)))
		1575	return;
		1576
		1577	{
		1578	int active = ((W)w)->active;
		1579	idles [active - 1] = idles [--idlecnt];
		1580	((W)idles [active - 1])->active = active;
		1581	}
		1582
		1583	ev_stop (EV_A_ (W)w);
		1584	}
		1585
		1586	void
		1587	ev_prepare_start (EV_P_ ev_prepare *w)
		1588	{
		1589	if (expect_false (ev_is_active (w)))
		1590	return;
		1591
		1592	ev_start (EV_A_ (W)w, ++preparecnt);
		1593	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1594	prepares [preparecnt - 1] = w;
		1595	}
		1596
		1597	void
		1598	ev_prepare_stop (EV_P_ ev_prepare *w)
		1599	{
		1600	ev_clear_pending (EV_A_ (W)w);
		1601	if (expect_false (!ev_is_active (w)))
		1602	return;
		1603
		1604	{
		1605	int active = ((W)w)->active;
		1606	prepares [active - 1] = prepares [--preparecnt];
		1607	((W)prepares [active - 1])->active = active;
		1608	}
		1609
		1610	ev_stop (EV_A_ (W)w);
		1611	}
		1612
		1613	void
		1614	ev_check_start (EV_P_ ev_check *w)
		1615	{
		1616	if (expect_false (ev_is_active (w)))
		1617	return;
		1618
		1619	ev_start (EV_A_ (W)w, ++checkcnt);
		1620	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1621	checks [checkcnt - 1] = w;
		1622	}
		1623
		1624	void
		1625	ev_check_stop (EV_P_ ev_check *w)
		1626	{
		1627	ev_clear_pending (EV_A_ (W)w);
		1628	if (expect_false (!ev_is_active (w)))
		1629	return;
		1630
		1631	{
		1632	int active = ((W)w)->active;
		1633	checks [active - 1] = checks [--checkcnt];
		1634	((W)checks [active - 1])->active = active;
		1635	}
		1636
		1637	ev_stop (EV_A_ (W)w);
		1638	}
		1639
		1640	#ifndef SA_RESTART
		1641	# define SA_RESTART 0
		1642	#endif
		1643
		1644	void
657	evsignal_start (struct ev_signal *w)	1645	ev_signal_start (EV_P_ ev_signal *w)
658	{	1646	{
		1647	#if EV_MULTIPLICITY
		1648	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1649	#endif
659	if (ev_is_active (w))	1650	if (expect_false (ev_is_active (w)))
660	return;	1651	return;
661		1652
662	ev_start ((struct ev_watcher *)w, 1);	1653	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1654
		1655	ev_start (EV_A_ (W)w, 1);
663	array_needsize (signals, signalmax, w->signum, signals_init);	1656	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
664	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1657	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
665		1658
666	if (!w->next)	1659	if (!((WL)w)->next)
667	{	1660	{
		1661	#if _WIN32
		1662	signal (w->signum, sighandler);
		1663	#else
668	struct sigaction sa;	1664	struct sigaction sa;
669	sa.sa_handler = sighandler;	1665	sa.sa_handler = sighandler;
670	sigfillset (&sa.sa_mask);	1666	sigfillset (&sa.sa_mask);
671	sa.sa_flags = 0;	1667	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
672	sigaction (w->signum, &sa, 0);	1668	sigaction (w->signum, &sa, 0);
		1669	#endif
673	}	1670	}
674	}	1671	}
675		1672
676	void	1673	void
677	evsignal_stop (struct ev_signal *w)	1674	ev_signal_stop (EV_P_ ev_signal *w)
678	{	1675	{
		1676	ev_clear_pending (EV_A_ (W)w);
679	if (!ev_is_active (w))	1677	if (expect_false (!ev_is_active (w)))
680	return;	1678	return;
681		1679
682	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1680	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
683	ev_stop ((struct ev_watcher *)w);	1681	ev_stop (EV_A_ (W)w);
684		1682
685	if (!signals [w->signum - 1].head)	1683	if (!signals [w->signum - 1].head)
686	signal (w->signum, SIG_DFL);	1684	signal (w->signum, SIG_DFL);
687	}	1685	}
688		1686
689	void evidle_start (struct ev_idle *w)	1687	void
		1688	ev_child_start (EV_P_ ev_child *w)
690	{	1689	{
		1690	#if EV_MULTIPLICITY
		1691	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1692	#endif
		1693	if (expect_false (ev_is_active (w)))
		1694	return;
		1695
		1696	ev_start (EV_A_ (W)w, 1);
		1697	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1698	}
		1699
		1700	void
		1701	ev_child_stop (EV_P_ ev_child *w)
		1702	{
		1703	ev_clear_pending (EV_A_ (W)w);
		1704	if (expect_false (!ev_is_active (w)))
		1705	return;
		1706
		1707	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1708	ev_stop (EV_A_ (W)w);
		1709	}
		1710
		1711	#if EV_EMBED_ENABLE
		1712	void noinline
		1713	ev_embed_sweep (EV_P_ ev_embed *w)
		1714	{
		1715	ev_loop (w->loop, EVLOOP_NONBLOCK);
		1716	}
		1717
		1718	static void
		1719	embed_cb (EV_P_ ev_io *io, int revents)
		1720	{
		1721	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		1722
691	if (ev_is_active (w))	1723	if (ev_cb (w))
692	return;	1724	ev_feed_event (EV_A_ (W)w, EV_EMBED);
693		1725	else
694	ev_start ((struct ev_watcher *)w, ++idlecnt);	1726	ev_embed_sweep (loop, w);
695	array_needsize (idles, idlemax, idlecnt, );
696	idles [idlecnt - 1] = w;
697	}	1727	}
698		1728
699	void evidle_stop (struct ev_idle *w)	1729	void
		1730	ev_embed_start (EV_P_ ev_embed *w)
700	{	1731	{
701	idles [w->active - 1] = idles [--idlecnt];
702	ev_stop ((struct ev_watcher *)w);
703	}
704
705	void evcheck_start (struct ev_check *w)
706	{
707	if (ev_is_active (w))	1732	if (expect_false (ev_is_active (w)))
708	return;	1733	return;
709		1734
710	ev_start ((struct ev_watcher *)w, ++checkcnt);	1735	{
711	array_needsize (checks, checkmax, checkcnt, );	1736	struct ev_loop *loop = w->loop;
712	checks [checkcnt - 1] = w;	1737	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
713	}	1738	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		1739	}
714		1740
715	void evcheck_stop (struct ev_check *w)	1741	ev_set_priority (&w->io, ev_priority (w));
716	{	1742	ev_io_start (EV_A_ &w->io);
717	checks [w->active - 1] = checks [--checkcnt];	1743
718	ev_stop ((struct ev_watcher *)w);	1744	ev_start (EV_A_ (W)w, 1);
719	}	1745	}
		1746
		1747	void
		1748	ev_embed_stop (EV_P_ ev_embed *w)
		1749	{
		1750	ev_clear_pending (EV_A_ (W)w);
		1751	if (expect_false (!ev_is_active (w)))
		1752	return;
		1753
		1754	ev_io_stop (EV_A_ &w->io);
		1755
		1756	ev_stop (EV_A_ (W)w);
		1757	}
		1758	#endif
		1759
		1760	#if EV_STAT_ENABLE
		1761
		1762	# ifdef _WIN32
		1763	# define lstat(a,b) stat(a,b)
		1764	# endif
		1765
		1766	void
		1767	ev_stat_stat (EV_P_ ev_stat *w)
		1768	{
		1769	if (lstat (w->path, &w->attr) < 0)
		1770	w->attr.st_nlink = 0;
		1771	else if (!w->attr.st_nlink)
		1772	w->attr.st_nlink = 1;
		1773	}
		1774
		1775	static void
		1776	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1777	{
		1778	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1779
		1780	/* we copy this here each the time so that */
		1781	/* prev has the old value when the callback gets invoked */
		1782	w->prev = w->attr;
		1783	ev_stat_stat (EV_A_ w);
		1784
		1785	if (memcmp (&w->prev, &w->attr, sizeof (ev_statdata)))
		1786	ev_feed_event (EV_A_ w, EV_STAT);
		1787	}
		1788
		1789	void
		1790	ev_stat_start (EV_P_ ev_stat *w)
		1791	{
		1792	if (expect_false (ev_is_active (w)))
		1793	return;
		1794
		1795	/* since we use memcmp, we need to clear any padding data etc. */
		1796	memset (&w->prev, 0, sizeof (ev_statdata));
		1797	memset (&w->attr, 0, sizeof (ev_statdata));
		1798
		1799	ev_stat_stat (EV_A_ w);
		1800
		1801	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		1802	ev_set_priority (&w->timer, ev_priority (w));
		1803	ev_timer_start (EV_A_ &w->timer);
		1804
		1805	ev_start (EV_A_ (W)w, 1);
		1806	}
		1807
		1808	void
		1809	ev_stat_stop (EV_P_ ev_stat *w)
		1810	{
		1811	ev_clear_pending (EV_A_ (W)w);
		1812	if (expect_false (!ev_is_active (w)))
		1813	return;
		1814
		1815	ev_timer_stop (EV_A_ &w->timer);
		1816
		1817	ev_stop (EV_A_ (W)w);
		1818	}
		1819	#endif
720		1820
721	/*****************************************************************************/	1821	/*****************************************************************************/
722	#if 1	1822
		1823	struct ev_once
		1824	{
		1825	ev_io io;
		1826	ev_timer to;
		1827	void (*cb)(int revents, void *arg);
		1828	void *arg;
		1829	};
723		1830
724	static void	1831	static void
725	sin_cb (struct ev_io *w, int revents)	1832	once_cb (EV_P_ struct ev_once *once, int revents)
726	{	1833	{
727	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1834	void (*cb)(int revents, void *arg) = once->cb;
		1835	void *arg = once->arg;
		1836
		1837	ev_io_stop (EV_A_ &once->io);
		1838	ev_timer_stop (EV_A_ &once->to);
		1839	ev_free (once);
		1840
		1841	cb (revents, arg);
728	}	1842	}
729		1843
730	static void	1844	static void
731	ocb (struct ev_timer *w, int revents)	1845	once_cb_io (EV_P_ ev_io *w, int revents)
732	{	1846	{
733	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1847	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
734	evtimer_stop (w);
735	evtimer_start (w);
736	}	1848	}
737		1849
738	static void	1850	static void
739	scb (struct ev_signal *w, int revents)	1851	once_cb_to (EV_P_ ev_timer *w, int revents)
740	{	1852	{
741	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1853	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
742	}	1854	}
743		1855
744	static void	1856	void
745	gcb (struct ev_signal *w, int revents)	1857	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
746	{	1858	{
747	fprintf (stderr, "generic %x\n", revents);	1859	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
748	}
749		1860
750	int main (void)	1861	if (expect_false (!once))
751	{
752	struct ev_io sin;
753
754	ev_init (0);
755
756	evw_init (&sin, sin_cb, 55);
757	evio_set (&sin, 0, EV_READ);
758	evio_start (&sin);
759
760	struct ev_timer t[10000];
761
762	#if 0
763	int i;
764	for (i = 0; i < 10000; ++i)
765	{
766	struct ev_timer *w = t + i;
767	evw_init (w, ocb, i);
768	evtimer_set_abs (w, drand48 (), 0.99775533);
769	evtimer_start (w);
770	if (drand48 () < 0.5)
771	evtimer_stop (w);
772	}	1862	{
773	#endif	1863	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
774
775	struct ev_timer t1;
776	evw_init (&t1, ocb, 0);
777	evtimer_set_abs (&t1, 5, 10);
778	evtimer_start (&t1);
779
780	struct ev_signal sig;
781	evw_init (&sig, scb, 65535);
782	evsignal_set (&sig, SIGQUIT);
783	evsignal_start (&sig);
784
785	struct ev_check cw;
786	evw_init (&cw, gcb, 0);
787	evcheck_start (&cw);
788
789	struct ev_idle iw;
790	evw_init (&iw, gcb, 0);
791	evidle_start (&iw);
792
793	ev_loop (0);
794
795	return 0;	1864	return;
796	}	1865	}
797		1866
798	#endif	1867	once->cb = cb;
		1868	once->arg = arg;
799		1869
		1870	ev_init (&once->io, once_cb_io);
		1871	if (fd >= 0)
		1872	{
		1873	ev_io_set (&once->io, fd, events);
		1874	ev_io_start (EV_A_ &once->io);
		1875	}
800		1876
		1877	ev_init (&once->to, once_cb_to);
		1878	if (timeout >= 0.)
		1879	{
		1880	ev_timer_set (&once->to, timeout, 0.);
		1881	ev_timer_start (EV_A_ &once->to);
		1882	}
		1883	}
801		1884
		1885	#ifdef __cplusplus
		1886	}
		1887	#endif
802		1888

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