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Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.140 by root, Mon Nov 26 19:49:36 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
14	#ifndef HAVE_MONOTONIC	113	#include <signal.h>
15	# ifdef CLOCK_MONOTONIC	114
16	# define HAVE_MONOTONIC 1	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
17	# endif	124	# endif
18	#endif	125	#endif
19		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
20	#ifndef HAVE_SELECT	137	#ifndef EV_USE_SELECT
21	# define HAVE_SELECT 1	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
22	#endif	146	# endif
		147	#endif
23		148
24	#ifndef HAVE_EPOLL	149	#ifndef EV_USE_EPOLL
25	# define HAVE_EPOLL 0	150	# define EV_USE_EPOLL 0
26	#endif	151	#endif
27		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
		163	#ifndef CLOCK_MONOTONIC
		164	# undef EV_USE_MONOTONIC
		165	# define EV_USE_MONOTONIC 0
		166	#endif
		167
28	#ifndef HAVE_REALTIME	168	#ifndef CLOCK_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	169	# undef EV_USE_REALTIME
		170	# define EV_USE_REALTIME 0
30	#endif	171	#endif
		172
		173	#if EV_SELECT_IS_WINSOCKET
		174	# include <winsock.h>
		175	#endif
		176
		177	/**/
31		178
32	#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) */
33	#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 */
34		183
		184	#ifdef EV_H
		185	# include EV_H
		186	#else
35	#include "ev.h"	187	# include "ev.h"
		188	#endif
36		189
37	struct ev_watcher {	190	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	191	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	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
40		206
41	struct ev_watcher_list {	207	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	208	#define expect_true(expr) expect ((expr) != 0, 1)
43	};
44		209
		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
45	typedef struct ev_watcher *W;	216	typedef ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	217	typedef ev_watcher_list *WL;
		218	typedef ev_watcher_time *WT;
47		219
48	static ev_tstamp now, diff; /* monotonic clock */	220	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
49	ev_tstamp ev_now;
50	int ev_method;
51		221
52	static int have_monotonic; /* runtime */	222	#ifdef _WIN32
53		223	# include "ev_win32.c"
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	224	#endif
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		225
58	/*****************************************************************************/	226	/*****************************************************************************/
59		227
60	ev_tstamp	228	static void (*syserr_cb)(const char *msg);
		229
		230	void ev_set_syserr_cb (void (*cb)(const char *msg))
		231	{
		232	syserr_cb = cb;
		233	}
		234
		235	static void
		236	syserr (const char *msg)
		237	{
		238	if (!msg)
		239	msg = "(libev) system error";
		240
		241	if (syserr_cb)
		242	syserr_cb (msg);
		243	else
		244	{
		245	perror (msg);
		246	abort ();
		247	}
		248	}
		249
		250	static void *(*alloc)(void *ptr, long size);
		251
		252	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		253	{
		254	alloc = cb;
		255	}
		256
		257	static void *
		258	ev_realloc (void *ptr, long size)
		259	{
		260	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		261
		262	if (!ptr && size)
		263	{
		264	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		265	abort ();
		266	}
		267
		268	return ptr;
		269	}
		270
		271	#define ev_malloc(size) ev_realloc (0, (size))
		272	#define ev_free(ptr) ev_realloc ((ptr), 0)
		273
		274	/*****************************************************************************/
		275
		276	typedef struct
		277	{
		278	WL head;
		279	unsigned char events;
		280	unsigned char reify;
		281	#if EV_SELECT_IS_WINSOCKET
		282	SOCKET handle;
		283	#endif
		284	} ANFD;
		285
		286	typedef struct
		287	{
		288	W w;
		289	int events;
		290	} ANPENDING;
		291
		292	#if EV_MULTIPLICITY
		293
		294	struct ev_loop
		295	{
		296	ev_tstamp ev_rt_now;
		297	#define ev_rt_now ((loop)->ev_rt_now)
		298	#define VAR(name,decl) decl;
		299	#include "ev_vars.h"
		300	#undef VAR
		301	};
		302	#include "ev_wrap.h"
		303
		304	static struct ev_loop default_loop_struct;
		305	struct ev_loop *ev_default_loop_ptr;
		306
		307	#else
		308
		309	ev_tstamp ev_rt_now;
		310	#define VAR(name,decl) static decl;
		311	#include "ev_vars.h"
		312	#undef VAR
		313
		314	static int ev_default_loop_ptr;
		315
		316	#endif
		317
		318	/*****************************************************************************/
		319
		320	ev_tstamp noinline
61	ev_time (void)	321	ev_time (void)
62	{	322	{
63	#if HAVE_REALTIME	323	#if EV_USE_REALTIME
64	struct timespec ts;	324	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	325	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	326	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	327	#else
68	struct timeval tv;	328	struct timeval tv;
69	gettimeofday (&tv, 0);	329	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	330	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	331	#endif
72	}	332	}
73		333
74	static ev_tstamp	334	ev_tstamp inline_size
75	get_clock (void)	335	get_clock (void)
76	{	336	{
77	#if HAVE_MONOTONIC	337	#if EV_USE_MONOTONIC
78	if (have_monotonic)	338	if (expect_true (have_monotonic))
79	{	339	{
80	struct timespec ts;	340	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	341	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	342	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	343	}
84	#endif	344	#endif
85		345
86	return ev_time ();	346	return ev_time ();
87	}	347	}
88		348
		349	#if EV_MULTIPLICITY
		350	ev_tstamp
		351	ev_now (EV_P)
		352	{
		353	return ev_rt_now;
		354	}
		355	#endif
		356
		357	#define array_roundsize(type,n) (((n) | 4) & ~3)
		358
89	#define array_needsize(base,cur,cnt,init) \	359	#define array_needsize(type,base,cur,cnt,init) \
90	if ((cnt) > cur) \	360	if (expect_false ((cnt) > cur)) \
91	{ \	361	{ \
92	int newcnt = cur ? cur << 1 : 16; \	362	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	363	do \
		364	{ \
		365	newcnt = array_roundsize (type, newcnt << 1); \
		366	} \
		367	while ((cnt) > newcnt); \
		368	\
94	base = realloc (base, sizeof (*base) * (newcnt)); \	369	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
95	init (base + cur, newcnt - cur); \	370	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	371	cur = newcnt; \
97	}	372	}
		373
		374	#define array_slim(type,stem) \
		375	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		376	{ \
		377	stem ## max = array_roundsize (stem ## cnt >> 1); \
		378	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		379	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		380	}
		381
		382	#define array_free(stem, idx) \
		383	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		384
99	/*****************************************************************************/	385	/*****************************************************************************/
100		386
		387	void inline_size
		388	anfds_init (ANFD *base, int count)
		389	{
		390	while (count--)
		391	{
		392	base->head = 0;
		393	base->events = EV_NONE;
		394	base->reify = 0;
		395
		396	++base;
		397	}
		398	}
		399
		400	void noinline
		401	ev_feed_event (EV_P_ void *w, int revents)
		402	{
		403	W w_ = (W)w;
		404
		405	if (expect_false (w_->pending))
		406	{
		407	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		408	return;
		409	}
		410
		411	w_->pending = ++pendingcnt [ABSPRI (w_)];
		412	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
		413	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		414	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		415	}
		416
		417	static void
		418	queue_events (EV_P_ W *events, int eventcnt, int type)
		419	{
		420	int i;
		421
		422	for (i = 0; i < eventcnt; ++i)
		423	ev_feed_event (EV_A_ events [i], type);
		424	}
		425
		426	void inline_speed
		427	fd_event (EV_P_ int fd, int revents)
		428	{
		429	ANFD *anfd = anfds + fd;
		430	ev_io *w;
		431
		432	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		433	{
		434	int ev = w->events & revents;
		435
		436	if (ev)
		437	ev_feed_event (EV_A_ (W)w, ev);
		438	}
		439	}
		440
		441	void
		442	ev_feed_fd_event (EV_P_ int fd, int revents)
		443	{
		444	fd_event (EV_A_ fd, revents);
		445	}
		446
		447	/*****************************************************************************/
		448
		449	void inline_size
		450	fd_reify (EV_P)
		451	{
		452	int i;
		453
		454	for (i = 0; i < fdchangecnt; ++i)
		455	{
		456	int fd = fdchanges [i];
		457	ANFD *anfd = anfds + fd;
		458	ev_io *w;
		459
		460	int events = 0;
		461
		462	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		463	events |= w->events;
		464
		465	#if EV_SELECT_IS_WINSOCKET
		466	if (events)
		467	{
		468	unsigned long argp;
		469	anfd->handle = _get_osfhandle (fd);
		470	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		471	}
		472	#endif
		473
		474	anfd->reify = 0;
		475
		476	backend_modify (EV_A_ fd, anfd->events, events);
		477	anfd->events = events;
		478	}
		479
		480	fdchangecnt = 0;
		481	}
		482
		483	void inline_size
		484	fd_change (EV_P_ int fd)
		485	{
		486	if (expect_false (anfds [fd].reify))
		487	return;
		488
		489	anfds [fd].reify = 1;
		490
		491	++fdchangecnt;
		492	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		493	fdchanges [fdchangecnt - 1] = fd;
		494	}
		495
		496	void inline_speed
		497	fd_kill (EV_P_ int fd)
		498	{
		499	ev_io *w;
		500
		501	while ((w = (ev_io *)anfds [fd].head))
		502	{
		503	ev_io_stop (EV_A_ w);
		504	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		505	}
		506	}
		507
		508	int inline_size
		509	fd_valid (int fd)
		510	{
		511	#ifdef _WIN32
		512	return _get_osfhandle (fd) != -1;
		513	#else
		514	return fcntl (fd, F_GETFD) != -1;
		515	#endif
		516	}
		517
		518	/* called on EBADF to verify fds */
		519	static void noinline
		520	fd_ebadf (EV_P)
		521	{
		522	int fd;
		523
		524	for (fd = 0; fd < anfdmax; ++fd)
		525	if (anfds [fd].events)
		526	if (!fd_valid (fd) == -1 && errno == EBADF)
		527	fd_kill (EV_A_ fd);
		528	}
		529
		530	/* called on ENOMEM in select/poll to kill some fds and retry */
		531	static void noinline
		532	fd_enomem (EV_P)
		533	{
		534	int fd;
		535
		536	for (fd = anfdmax; fd--; )
		537	if (anfds [fd].events)
		538	{
		539	fd_kill (EV_A_ fd);
		540	return;
		541	}
		542	}
		543
		544	/* usually called after fork if backend needs to re-arm all fds from scratch */
		545	static void noinline
		546	fd_rearm_all (EV_P)
		547	{
		548	int fd;
		549
		550	/* this should be highly optimised to not do anything but set a flag */
		551	for (fd = 0; fd < anfdmax; ++fd)
		552	if (anfds [fd].events)
		553	{
		554	anfds [fd].events = 0;
		555	fd_change (EV_A_ fd);
		556	}
		557	}
		558
		559	/*****************************************************************************/
		560
		561	void inline_speed
		562	upheap (WT *heap, int k)
		563	{
		564	WT w = heap [k];
		565
		566	while (k && heap [k >> 1]->at > w->at)
		567	{
		568	heap [k] = heap [k >> 1];
		569	((W)heap [k])->active = k + 1;
		570	k >>= 1;
		571	}
		572
		573	heap [k] = w;
		574	((W)heap [k])->active = k + 1;
		575
		576	}
		577
		578	void inline_speed
		579	downheap (WT *heap, int N, int k)
		580	{
		581	WT w = heap [k];
		582
		583	while (k < (N >> 1))
		584	{
		585	int j = k << 1;
		586
		587	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		588	++j;
		589
		590	if (w->at <= heap [j]->at)
		591	break;
		592
		593	heap [k] = heap [j];
		594	((W)heap [k])->active = k + 1;
		595	k = j;
		596	}
		597
		598	heap [k] = w;
		599	((W)heap [k])->active = k + 1;
		600	}
		601
		602	void inline_size
		603	adjustheap (WT *heap, int N, int k)
		604	{
		605	upheap (heap, k);
		606	downheap (heap, N, k);
		607	}
		608
		609	/*****************************************************************************/
		610
101	typedef struct	611	typedef struct
102	{	612	{
103	struct ev_io *head;	613	WL head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void
114	anfds_init (ANFD *base, int count)
115	{
116	while (count--)
117	{
118	base->head = 0;
119	base->wev = base->rev = EV_NONE;
120	++base;
121	}
122	}
123
124	typedef struct
125	{
126	W w;
127	int events;
128	} ANPENDING;
129
130	static ANPENDING *pendings;
131	static int pendingmax, pendingcnt;
132
133	static void
134	event (W w, int events)
135	{
136	w->pending = ++pendingcnt;
137	array_needsize (pendings, pendingmax, pendingcnt, );
138	pendings [pendingcnt - 1].w = w;
139	pendings [pendingcnt - 1].events = events;
140	}
141
142	static void
143	fd_event (int fd, int events)
144	{
145	ANFD *anfd = anfds + fd;
146	struct ev_io *w;
147
148	for (w = anfd->head; w; w = w->next)
149	{
150	int ev = w->events & events;
151
152	if (ev)
153	event ((W)w, ev);
154	}
155	}
156
157	static void
158	queue_events (W *events, int eventcnt, int type)
159	{
160	int i;
161
162	for (i = 0; i < eventcnt; ++i)
163	event (events [i], type);
164	}
165
166	/*****************************************************************************/
167
168	static struct ev_timer **atimers;
169	static int atimermax, atimercnt;
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void
175	upheap (struct ev_timer **timers, int k)
176	{
177	struct ev_timer *w = timers [k];
178
179	while (k && timers [k >> 1]->at > w->at)
180	{
181	timers [k] = timers [k >> 1];
182	timers [k]->active = k + 1;
183	k >>= 1;
184	}
185
186	timers [k] = w;
187	timers [k]->active = k + 1;
188
189	}
190
191	static void
192	downheap (struct ev_timer **timers, int N, int k)
193	{
194	struct ev_timer *w = timers [k];
195
196	while (k < (N >> 1))
197	{
198	int j = k << 1;
199
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
201	++j;
202
203	if (w->at <= timers [j]->at)
204	break;
205
206	timers [k] = timers [j];
207	timers [k]->active = k + 1;
208	k = j;
209	}
210
211	timers [k] = w;
212	timers [k]->active = k + 1;
213	}
214
215	/*****************************************************************************/
216
217	typedef struct
218	{
219	struct ev_signal *head;
220	sig_atomic_t gotsig;	614	sig_atomic_t volatile gotsig;
221	} ANSIG;	615	} ANSIG;
222		616
223	static ANSIG *signals;	617	static ANSIG *signals;
224	static int signalmax;	618	static int signalmax;
225		619
226	static int sigpipe [2];	620	static int sigpipe [2];
227	static sig_atomic_t gotsig;	621	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	622	static ev_io sigev;
229		623
230	static void	624	void inline_size
231	signals_init (ANSIG *base, int count)	625	signals_init (ANSIG *base, int count)
232	{	626	{
233	while (count--)	627	while (count--)
234	{	628	{
235	base->head = 0;	629	base->head = 0;
236	base->gotsig = 0;	630	base->gotsig = 0;
		631
237	++base;	632	++base;
238	}	633	}
239	}	634	}
240		635
241	static void	636	static void
242	sighandler (int signum)	637	sighandler (int signum)
243	{	638	{
		639	#if _WIN32
		640	signal (signum, sighandler);
		641	#endif
		642
244	signals [signum - 1].gotsig = 1;	643	signals [signum - 1].gotsig = 1;
245		644
246	if (!gotsig)	645	if (!gotsig)
247	{	646	{
		647	int old_errno = errno;
248	gotsig = 1;	648	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);	649	write (sigpipe [1], &signum, 1);
		650	errno = old_errno;
250	}	651	}
		652	}
		653
		654	void noinline
		655	ev_feed_signal_event (EV_P_ int signum)
		656	{
		657	WL w;
		658
		659	#if EV_MULTIPLICITY
		660	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		661	#endif
		662
		663	--signum;
		664
		665	if (signum < 0 || signum >= signalmax)
		666	return;
		667
		668	signals [signum].gotsig = 0;
		669
		670	for (w = signals [signum].head; w; w = w->next)
		671	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
251	}	672	}
252		673
253	static void	674	static void
254	sigcb (struct ev_io *iow, int revents)	675	sigcb (EV_P_ ev_io *iow, int revents)
255	{	676	{
256	struct ev_signal *w;
257	int sig;	677	int signum;
258		678
		679	read (sigpipe [0], &revents, 1);
259	gotsig = 0;	680	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		681
262	for (sig = signalmax; sig--; )	682	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	683	if (signals [signum].gotsig)
		684	ev_feed_signal_event (EV_A_ signum + 1);
		685	}
		686
		687	void inline_size
		688	fd_intern (int fd)
		689	{
		690	#ifdef _WIN32
		691	int arg = 1;
		692	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		693	#else
		694	fcntl (fd, F_SETFD, FD_CLOEXEC);
		695	fcntl (fd, F_SETFL, O_NONBLOCK);
		696	#endif
		697	}
		698
		699	static void noinline
		700	siginit (EV_P)
		701	{
		702	fd_intern (sigpipe [0]);
		703	fd_intern (sigpipe [1]);
		704
		705	ev_io_set (&sigev, sigpipe [0], EV_READ);
		706	ev_io_start (EV_A_ &sigev);
		707	ev_unref (EV_A); /* child watcher should not keep loop alive */
		708	}
		709
		710	/*****************************************************************************/
		711
		712	static ev_child *childs [PID_HASHSIZE];
		713
		714	#ifndef _WIN32
		715
		716	static ev_signal childev;
		717
		718	#ifndef WCONTINUED
		719	# define WCONTINUED 0
		720	#endif
		721
		722	void inline_speed
		723	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		724	{
		725	ev_child *w;
		726
		727	for (w = (ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		728	if (w->pid == pid || !w->pid)
264	{	729	{
265	signals [sig].gotsig = 0;	730	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
266		731	w->rpid = pid;
267	for (w = signals [sig].head; w; w = w->next)	732	w->rstatus = status;
268	event ((W)w, EV_SIGNAL);	733	ev_feed_event (EV_A_ (W)w, EV_CHILD);
269	}	734	}
270	}	735	}
271		736
272	static void	737	static void
273	siginit (void)	738	childcb (EV_P_ ev_signal *sw, int revents)
274	{	739	{
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	740	int pid, status;
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		741
278	/* rather than sort out wether we really need nb, set it */	742	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	743	{
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	744	/* make sure we are called again until all childs have been reaped */
		745	/* we need to do it this way so that the callback gets called before we continue */
		746	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
281		747
282	evio_set (&sigev, sigpipe [0], EV_READ);	748	child_reap (EV_A_ sw, pid, pid, status);
283	evio_start (&sigev);	749	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		750	}
284	}	751	}
		752
		753	#endif
285		754
286	/*****************************************************************************/	755	/*****************************************************************************/
287		756
288	static struct ev_idle **idles;	757	#if EV_USE_PORT
289	static int idlemax, idlecnt;	758	# include "ev_port.c"
		759	#endif
		760	#if EV_USE_KQUEUE
		761	# include "ev_kqueue.c"
		762	#endif
		763	#if EV_USE_EPOLL
		764	# include "ev_epoll.c"
		765	#endif
		766	#if EV_USE_POLL
		767	# include "ev_poll.c"
		768	#endif
		769	#if EV_USE_SELECT
		770	# include "ev_select.c"
		771	#endif
290		772
291	static struct ev_check **checks;	773	int
292	static int checkmax, checkcnt;	774	ev_version_major (void)
		775	{
		776	return EV_VERSION_MAJOR;
		777	}
		778
		779	int
		780	ev_version_minor (void)
		781	{
		782	return EV_VERSION_MINOR;
		783	}
		784
		785	/* return true if we are running with elevated privileges and should ignore env variables */
		786	int inline_size
		787	enable_secure (void)
		788	{
		789	#ifdef _WIN32
		790	return 0;
		791	#else
		792	return getuid () != geteuid ()
		793	|| getgid () != getegid ();
		794	#endif
		795	}
		796
		797	unsigned int
		798	ev_supported_backends (void)
		799	{
		800	unsigned int flags = 0;
		801
		802	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		803	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		804	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		805	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		806	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		807
		808	return flags;
		809	}
		810
		811	unsigned int
		812	ev_recommended_backends (void)
		813	{
		814	unsigned int flags = ev_supported_backends ();
		815
		816	#ifndef __NetBSD__
		817	/* kqueue is borked on everything but netbsd apparently */
		818	/* it usually doesn't work correctly on anything but sockets and pipes */
		819	flags &= ~EVBACKEND_KQUEUE;
		820	#endif
		821	#ifdef __APPLE__
		822	// flags &= ~EVBACKEND_KQUEUE; for documentation
		823	flags &= ~EVBACKEND_POLL;
		824	#endif
		825
		826	return flags;
		827	}
		828
		829	unsigned int
		830	ev_embeddable_backends (void)
		831	{
		832	return EVBACKEND_EPOLL
		833	| EVBACKEND_KQUEUE
		834	| EVBACKEND_PORT;
		835	}
		836
		837	unsigned int
		838	ev_backend (EV_P)
		839	{
		840	return backend;
		841	}
		842
		843	static void
		844	loop_init (EV_P_ unsigned int flags)
		845	{
		846	if (!backend)
		847	{
		848	#if EV_USE_MONOTONIC
		849	{
		850	struct timespec ts;
		851	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		852	have_monotonic = 1;
		853	}
		854	#endif
		855
		856	ev_rt_now = ev_time ();
		857	mn_now = get_clock ();
		858	now_floor = mn_now;
		859	rtmn_diff = ev_rt_now - mn_now;
		860
		861	if (!(flags & EVFLAG_NOENV)
		862	&& !enable_secure ()
		863	&& getenv ("LIBEV_FLAGS"))
		864	flags = atoi (getenv ("LIBEV_FLAGS"));
		865
		866	if (!(flags & 0x0000ffffUL))
		867	flags |= ev_recommended_backends ();
		868
		869	backend = 0;
		870	#if EV_USE_PORT
		871	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		872	#endif
		873	#if EV_USE_KQUEUE
		874	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		875	#endif
		876	#if EV_USE_EPOLL
		877	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		878	#endif
		879	#if EV_USE_POLL
		880	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		881	#endif
		882	#if EV_USE_SELECT
		883	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		884	#endif
		885
		886	ev_init (&sigev, sigcb);
		887	ev_set_priority (&sigev, EV_MAXPRI);
		888	}
		889	}
		890
		891	static void
		892	loop_destroy (EV_P)
		893	{
		894	int i;
		895
		896	#if EV_USE_PORT
		897	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		898	#endif
		899	#if EV_USE_KQUEUE
		900	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		901	#endif
		902	#if EV_USE_EPOLL
		903	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		904	#endif
		905	#if EV_USE_POLL
		906	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		907	#endif
		908	#if EV_USE_SELECT
		909	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		910	#endif
		911
		912	for (i = NUMPRI; i--; )
		913	array_free (pending, [i]);
		914
		915	/* have to use the microsoft-never-gets-it-right macro */
		916	array_free (fdchange, EMPTY0);
		917	array_free (timer, EMPTY0);
		918	#if EV_PERIODIC_ENABLE
		919	array_free (periodic, EMPTY0);
		920	#endif
		921	array_free (idle, EMPTY0);
		922	array_free (prepare, EMPTY0);
		923	array_free (check, EMPTY0);
		924
		925	backend = 0;
		926	}
		927
		928	static void
		929	loop_fork (EV_P)
		930	{
		931	#if EV_USE_PORT
		932	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		933	#endif
		934	#if EV_USE_KQUEUE
		935	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		936	#endif
		937	#if EV_USE_EPOLL
		938	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		939	#endif
		940
		941	if (ev_is_active (&sigev))
		942	{
		943	/* default loop */
		944
		945	ev_ref (EV_A);
		946	ev_io_stop (EV_A_ &sigev);
		947	close (sigpipe [0]);
		948	close (sigpipe [1]);
		949
		950	while (pipe (sigpipe))
		951	syserr ("(libev) error creating pipe");
		952
		953	siginit (EV_A);
		954	}
		955
		956	postfork = 0;
		957	}
		958
		959	#if EV_MULTIPLICITY
		960	struct ev_loop *
		961	ev_loop_new (unsigned int flags)
		962	{
		963	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		964
		965	memset (loop, 0, sizeof (struct ev_loop));
		966
		967	loop_init (EV_A_ flags);
		968
		969	if (ev_backend (EV_A))
		970	return loop;
		971
		972	return 0;
		973	}
		974
		975	void
		976	ev_loop_destroy (EV_P)
		977	{
		978	loop_destroy (EV_A);
		979	ev_free (loop);
		980	}
		981
		982	void
		983	ev_loop_fork (EV_P)
		984	{
		985	postfork = 1;
		986	}
		987
		988	#endif
		989
		990	#if EV_MULTIPLICITY
		991	struct ev_loop *
		992	ev_default_loop_init (unsigned int flags)
		993	#else
		994	int
		995	ev_default_loop (unsigned int flags)
		996	#endif
		997	{
		998	if (sigpipe [0] == sigpipe [1])
		999	if (pipe (sigpipe))
		1000	return 0;
		1001
		1002	if (!ev_default_loop_ptr)
		1003	{
		1004	#if EV_MULTIPLICITY
		1005	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1006	#else
		1007	ev_default_loop_ptr = 1;
		1008	#endif
		1009
		1010	loop_init (EV_A_ flags);
		1011
		1012	if (ev_backend (EV_A))
		1013	{
		1014	siginit (EV_A);
		1015
		1016	#ifndef _WIN32
		1017	ev_signal_init (&childev, childcb, SIGCHLD);
		1018	ev_set_priority (&childev, EV_MAXPRI);
		1019	ev_signal_start (EV_A_ &childev);
		1020	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1021	#endif
		1022	}
		1023	else
		1024	ev_default_loop_ptr = 0;
		1025	}
		1026
		1027	return ev_default_loop_ptr;
		1028	}
		1029
		1030	void
		1031	ev_default_destroy (void)
		1032	{
		1033	#if EV_MULTIPLICITY
		1034	struct ev_loop *loop = ev_default_loop_ptr;
		1035	#endif
		1036
		1037	#ifndef _WIN32
		1038	ev_ref (EV_A); /* child watcher */
		1039	ev_signal_stop (EV_A_ &childev);
		1040	#endif
		1041
		1042	ev_ref (EV_A); /* signal watcher */
		1043	ev_io_stop (EV_A_ &sigev);
		1044
		1045	close (sigpipe [0]); sigpipe [0] = 0;
		1046	close (sigpipe [1]); sigpipe [1] = 0;
		1047
		1048	loop_destroy (EV_A);
		1049	}
		1050
		1051	void
		1052	ev_default_fork (void)
		1053	{
		1054	#if EV_MULTIPLICITY
		1055	struct ev_loop *loop = ev_default_loop_ptr;
		1056	#endif
		1057
		1058	if (backend)
		1059	postfork = 1;
		1060	}
293		1061
294	/*****************************************************************************/	1062	/*****************************************************************************/
295		1063
296	#if HAVE_EPOLL	1064	int inline_size
297	# include "ev_epoll.c"	1065	any_pending (EV_P)
298	#endif
299	#if HAVE_SELECT
300	# include "ev_select.c"
301	#endif
302
303	int ev_init (int flags)
304	{	1066	{
305	#if HAVE_MONOTONIC	1067	int pri;
306	{
307	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;
310	}
311	#endif
312		1068
313	ev_now = ev_time ();	1069	for (pri = NUMPRI; pri--; )
314	now = get_clock ();	1070	if (pendingcnt [pri])
315	diff = ev_now - now;	1071	return 1;
316		1072
317	if (pipe (sigpipe))
318	return 0;	1073	return 0;
319
320	ev_method = EVMETHOD_NONE;
321	#if HAVE_EPOLL
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327
328	if (ev_method)
329	{
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}	1074	}
336		1075
337	/*****************************************************************************/	1076	void inline_speed
338		1077	call_pending (EV_P)
339	void ev_prefork (void)
340	{	1078	{
341	/* nop */
342	}
343
344	void ev_postfork_parent (void)
345	{
346	/* nop */
347	}
348
349	void ev_postfork_child (void)
350	{
351	#if HAVE_EPOLL
352	if (ev_method == EVMETHOD_EPOLL)
353	epoll_postfork_child ();
354	#endif
355
356	evio_stop (&sigev);
357	close (sigpipe [0]);
358	close (sigpipe [1]);
359	pipe (sigpipe);
360	siginit ();
361	}
362
363	/*****************************************************************************/
364
365	static void
366	fd_reify (void)
367	{
368	int i;	1079	int pri;
369		1080
370	for (i = 0; i < fdchangecnt; ++i)	1081	for (pri = NUMPRI; pri--; )
		1082	while (pendingcnt [pri])
371	{	1083	{
372	int fd = fdchanges [i];	1084	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
373	ANFD *anfd = anfds + fd;
374	struct ev_io *w;
375		1085
376	int wev = 0;	1086	if (expect_true (p->w))
377
378	for (w = anfd->head; w; w = w->next)
379	wev |= w->events;
380
381	if (anfd->wev != wev)
382	{	1087	{
383	method_modify (fd, anfd->wev, wev);	1088	assert (("non-pending watcher on pending list", p->w->pending));
384	anfd->wev = wev;
385	}
386	}
387		1089
388	fdchangecnt = 0;
389	}
390
391	static void
392	call_pending ()
393	{
394	int i;
395
396	for (i = 0; i < pendingcnt; ++i)
397	{
398	ANPENDING *p = pendings + i;
399
400	if (p->w)
401	{
402	p->w->pending = 0;	1090	p->w->pending = 0;
403	p->w->cb (p->w, p->events);	1091	EV_CB_INVOKE (p->w, p->events);
404	}	1092	}
405	}	1093	}
406
407	pendingcnt = 0;
408	}	1094	}
409		1095
410	static void	1096	void inline_size
411	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1097	timers_reify (EV_P)
412	{	1098	{
413	while (timercnt && timers [0]->at <= now)	1099	while (timercnt && ((WT)timers [0])->at <= mn_now)
414	{	1100	{
415	struct ev_timer *w = timers [0];	1101	ev_timer *w = timers [0];
		1102
		1103	assert (("inactive timer on timer heap detected", ev_is_active (w)));
416		1104
417	/* first reschedule or stop timer */	1105	/* first reschedule or stop timer */
418	if (w->repeat)	1106	if (w->repeat)
419	{	1107	{
420	if (w->is_abs)	1108	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
421	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1109
422	else
423	w->at = now + w->repeat;	1110	((WT)w)->at += w->repeat;
		1111	if (((WT)w)->at < mn_now)
		1112	((WT)w)->at = mn_now;
424		1113
425	assert (w->at > now);
426
427	downheap (timers, timercnt, 0);	1114	downheap ((WT *)timers, timercnt, 0);
428	}	1115	}
429	else	1116	else
		1117	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1118
		1119	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1120	}
		1121	}
		1122
		1123	#if EV_PERIODIC_ENABLE
		1124	void inline_size
		1125	periodics_reify (EV_P)
		1126	{
		1127	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1128	{
		1129	ev_periodic *w = periodics [0];
		1130
		1131	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1132
		1133	/* first reschedule or stop timer */
		1134	if (w->reschedule_cb)
430	{	1135	{
431	evtimer_stop (w); /* nonrepeating: stop timer */	1136	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
432	--timercnt; /* maybe pass by reference instead? */	1137	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1138	downheap ((WT *)periodics, periodiccnt, 0);
433	}	1139	}
		1140	else if (w->interval)
		1141	{
		1142	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1143	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1144	downheap ((WT *)periodics, periodiccnt, 0);
		1145	}
		1146	else
		1147	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
434		1148
435	event ((W)w, EV_TIMEOUT);	1149	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
436	}	1150	}
437	}	1151	}
438		1152
439	static void	1153	static void noinline
440	time_update ()	1154	periodics_reschedule (EV_P)
441	{	1155	{
442	int i;	1156	int i;
		1157
		1158	/* adjust periodics after time jump */
		1159	for (i = 0; i < periodiccnt; ++i)
		1160	{
		1161	ev_periodic *w = periodics [i];
		1162
		1163	if (w->reschedule_cb)
		1164	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1165	else if (w->interval)
		1166	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1167	}
		1168
		1169	/* now rebuild the heap */
		1170	for (i = periodiccnt >> 1; i--; )
		1171	downheap ((WT *)periodics, periodiccnt, i);
		1172	}
		1173	#endif
		1174
		1175	int inline_size
		1176	time_update_monotonic (EV_P)
		1177	{
		1178	mn_now = get_clock ();
		1179
		1180	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1181	{
		1182	ev_rt_now = rtmn_diff + mn_now;
		1183	return 0;
		1184	}
		1185	else
		1186	{
		1187	now_floor = mn_now;
443	ev_now = ev_time ();	1188	ev_rt_now = ev_time ();
444		1189	return 1;
445	if (have_monotonic)
446	{	1190	}
447	ev_tstamp odiff = diff;	1191	}
448		1192
449	/* detecting time jumps is much more difficult */	1193	void inline_size
450	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1194	time_update (EV_P)
		1195	{
		1196	int i;
		1197
		1198	#if EV_USE_MONOTONIC
		1199	if (expect_true (have_monotonic))
		1200	{
		1201	if (time_update_monotonic (EV_A))
451	{	1202	{
452	now = get_clock ();	1203	ev_tstamp odiff = rtmn_diff;
		1204
		1205	/* loop a few times, before making important decisions.
		1206	* on the choice of "4": one iteration isn't enough,
		1207	* in case we get preempted during the calls to
		1208	* ev_time and get_clock. a second call is almost guarenteed
		1209	* to succeed in that case, though. and looping a few more times
		1210	* doesn't hurt either as we only do this on time-jumps or
		1211	* in the unlikely event of getting preempted here.
		1212	*/
		1213	for (i = 4; --i; )
		1214	{
453	diff = ev_now - now;	1215	rtmn_diff = ev_rt_now - mn_now;
454		1216
455	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1217	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
456	return; /* all is well */	1218	return; /* all is well */
457		1219
458	ev_now = ev_time ();	1220	ev_rt_now = ev_time ();
		1221	mn_now = get_clock ();
		1222	now_floor = mn_now;
		1223	}
		1224
		1225	# if EV_PERIODIC_ENABLE
		1226	periodics_reschedule (EV_A);
		1227	# endif
		1228	/* no timer adjustment, as the monotonic clock doesn't jump */
		1229	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
459	}	1230	}
		1231	}
		1232	else
		1233	#endif
		1234	{
		1235	ev_rt_now = ev_time ();
460		1236
461	/* time jump detected, reschedule atimers */	1237	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
462	for (i = 0; i < atimercnt; ++i)
463	{	1238	{
464	struct ev_timer *w = atimers [i];	1239	#if EV_PERIODIC_ENABLE
465	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1240	periodics_reschedule (EV_A);
		1241	#endif
		1242
		1243	/* adjust timers. this is easy, as the offset is the same for all */
		1244	for (i = 0; i < timercnt; ++i)
		1245	((WT)timers [i])->at += ev_rt_now - mn_now;
466	}	1246	}
467	}
468	else
469	{
470	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
471	/* time jump detected, adjust rtimers */
472	for (i = 0; i < rtimercnt; ++i)
473	rtimers [i]->at += ev_now - now;
474		1247
475	now = ev_now;	1248	mn_now = ev_rt_now;
476	}
477	}
478
479	int ev_loop_done;
480
481	void ev_loop (int flags)
482	{
483	double block;
484	ev_loop_done = flags & EVLOOP_ONESHOT;
485
486	if (checkcnt)
487	{	1249	}
488	queue_events ((W *)checks, checkcnt, EV_CHECK);	1250	}
		1251
		1252	void
		1253	ev_ref (EV_P)
		1254	{
		1255	++activecnt;
		1256	}
		1257
		1258	void
		1259	ev_unref (EV_P)
		1260	{
		1261	--activecnt;
		1262	}
		1263
		1264	static int loop_done;
		1265
		1266	void
		1267	ev_loop (EV_P_ int flags)
		1268	{
		1269	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1270	? EVUNLOOP_ONE
		1271	: EVUNLOOP_CANCEL;
		1272
		1273	while (activecnt)
		1274	{
		1275	/* queue check watchers (and execute them) */
		1276	if (expect_false (preparecnt))
		1277	{
		1278	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
489	call_pending ();	1279	call_pending (EV_A);
490	}	1280	}
491		1281
492	do	1282	/* we might have forked, so reify kernel state if necessary */
493	{	1283	if (expect_false (postfork))
		1284	loop_fork (EV_A);
		1285
494	/* update fd-related kernel structures */	1286	/* update fd-related kernel structures */
495	fd_reify ();	1287	fd_reify (EV_A);
496		1288
497	/* calculate blocking time */	1289	/* calculate blocking time */
		1290	{
		1291	double block;
		1292
498	if (flags & EVLOOP_NONBLOCK || idlecnt)	1293	if (flags & EVLOOP_NONBLOCK || idlecnt)
499	block = 0.;	1294	block = 0.; /* do not block at all */
500	else	1295	else
501	{	1296	{
		1297	/* update time to cancel out callback processing overhead */
		1298	#if EV_USE_MONOTONIC
		1299	if (expect_true (have_monotonic))
		1300	time_update_monotonic (EV_A);
		1301	else
		1302	#endif
		1303	{
		1304	ev_rt_now = ev_time ();
		1305	mn_now = ev_rt_now;
		1306	}
		1307
502	block = MAX_BLOCKTIME;	1308	block = MAX_BLOCKTIME;
503		1309
504	if (rtimercnt)	1310	if (timercnt)
505	{	1311	{
506	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1312	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
507	if (block > to) block = to;	1313	if (block > to) block = to;
508	}	1314	}
509		1315
		1316	#if EV_PERIODIC_ENABLE
510	if (atimercnt)	1317	if (periodiccnt)
511	{	1318	{
512	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1319	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
513	if (block > to) block = to;	1320	if (block > to) block = to;
514	}	1321	}
		1322	#endif
515		1323
516	if (block < 0.) block = 0.;	1324	if (expect_false (block < 0.)) block = 0.;
517	}	1325	}
518		1326
519	method_poll (block);	1327	backend_poll (EV_A_ block);
		1328	}
520		1329
521	/* update ev_now, do magic */	1330	/* update ev_rt_now, do magic */
522	time_update ();	1331	time_update (EV_A);
523		1332
524	/* queue pending timers and reschedule them */	1333	/* queue pending timers and reschedule them */
525	/* absolute timers first */	1334	timers_reify (EV_A); /* relative timers called last */
526	timers_reify (atimers, atimercnt, ev_now);	1335	#if EV_PERIODIC_ENABLE
527	/* relative timers second */	1336	periodics_reify (EV_A); /* absolute timers called first */
528	timers_reify (rtimers, rtimercnt, now);	1337	#endif
529		1338
530	/* queue idle watchers unless io or timers are pending */	1339	/* queue idle watchers unless other events are pending */
531	if (!pendingcnt)	1340	if (idlecnt && !any_pending (EV_A))
532	queue_events ((W *)idles, idlecnt, EV_IDLE);	1341	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
533		1342
534	/* queue check and possibly idle watchers */	1343	/* queue check watchers, to be executed first */
		1344	if (expect_false (checkcnt))
535	queue_events ((W *)checks, checkcnt, EV_CHECK);	1345	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
536		1346
537	call_pending ();	1347	call_pending (EV_A);
		1348
		1349	if (expect_false (loop_done))
		1350	break;
538	}	1351	}
539	while (!ev_loop_done);	1352
		1353	if (loop_done == EVUNLOOP_ONE)
		1354	loop_done = EVUNLOOP_CANCEL;
		1355	}
		1356
		1357	void
		1358	ev_unloop (EV_P_ int how)
		1359	{
		1360	loop_done = how;
540	}	1361	}
541		1362
542	/*****************************************************************************/	1363	/*****************************************************************************/
543		1364
544	static void	1365	void inline_size
545	wlist_add (WL *head, WL elem)	1366	wlist_add (WL *head, WL elem)
546	{	1367	{
547	elem->next = *head;	1368	elem->next = *head;
548	*head = elem;	1369	*head = elem;
549	}	1370	}
550		1371
551	static void	1372	void inline_size
552	wlist_del (WL *head, WL elem)	1373	wlist_del (WL *head, WL elem)
553	{	1374	{
554	while (*head)	1375	while (*head)
555	{	1376	{
556	if (*head == elem)	1377	if (*head == elem)
…		…
561		1382
562	head = &(*head)->next;	1383	head = &(*head)->next;
563	}	1384	}
564	}	1385	}
565		1386
566	static void	1387	void inline_speed
		1388	ev_clear_pending (EV_P_ W w)
		1389	{
		1390	if (w->pending)
		1391	{
		1392	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1393	w->pending = 0;
		1394	}
		1395	}
		1396
		1397	void inline_speed
567	ev_start (W w, int active)	1398	ev_start (EV_P_ W w, int active)
568	{	1399	{
569	w->pending = 0;	1400	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1401	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1402
570	w->active = active;	1403	w->active = active;
		1404	ev_ref (EV_A);
571	}	1405	}
572		1406
573	static void	1407	void inline_size
574	ev_stop (W w)	1408	ev_stop (EV_P_ W w)
575	{	1409	{
576	if (w->pending)	1410	ev_unref (EV_A);
577	pendings [w->pending - 1].w = 0;
578
579	w->active = 0;	1411	w->active = 0;
580	}	1412	}
581		1413
582	/*****************************************************************************/	1414	/*****************************************************************************/
583		1415
584	void	1416	void
585	evio_start (struct ev_io *w)	1417	ev_io_start (EV_P_ ev_io *w)
		1418	{
		1419	int fd = w->fd;
		1420
		1421	if (expect_false (ev_is_active (w)))
		1422	return;
		1423
		1424	assert (("ev_io_start called with negative fd", fd >= 0));
		1425
		1426	ev_start (EV_A_ (W)w, 1);
		1427	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1428	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1429
		1430	fd_change (EV_A_ fd);
		1431	}
		1432
		1433	void
		1434	ev_io_stop (EV_P_ ev_io *w)
		1435	{
		1436	ev_clear_pending (EV_A_ (W)w);
		1437	if (expect_false (!ev_is_active (w)))
		1438	return;
		1439
		1440	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1441
		1442	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1443	ev_stop (EV_A_ (W)w);
		1444
		1445	fd_change (EV_A_ w->fd);
		1446	}
		1447
		1448	void
		1449	ev_timer_start (EV_P_ ev_timer *w)
		1450	{
		1451	if (expect_false (ev_is_active (w)))
		1452	return;
		1453
		1454	((WT)w)->at += mn_now;
		1455
		1456	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1457
		1458	ev_start (EV_A_ (W)w, ++timercnt);
		1459	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1460	timers [timercnt - 1] = w;
		1461	upheap ((WT *)timers, timercnt - 1);
		1462
		1463	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1464	}
		1465
		1466	void
		1467	ev_timer_stop (EV_P_ ev_timer *w)
		1468	{
		1469	ev_clear_pending (EV_A_ (W)w);
		1470	if (expect_false (!ev_is_active (w)))
		1471	return;
		1472
		1473	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1474
		1475	if (expect_true (((W)w)->active < timercnt--))
		1476	{
		1477	timers [((W)w)->active - 1] = timers [timercnt];
		1478	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1479	}
		1480
		1481	((WT)w)->at -= mn_now;
		1482
		1483	ev_stop (EV_A_ (W)w);
		1484	}
		1485
		1486	void
		1487	ev_timer_again (EV_P_ ev_timer *w)
586	{	1488	{
587	if (ev_is_active (w))	1489	if (ev_is_active (w))
588	return;
589
590	int fd = w->fd;
591
592	ev_start ((W)w, 1);
593	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
594	wlist_add ((WL *)&anfds[fd].head, (WL)w);
595
596	++fdchangecnt;
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = fd;
599	}
600
601	void
602	evio_stop (struct ev_io *w)
603	{
604	if (!ev_is_active (w))
605	return;
606
607	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
608	ev_stop ((W)w);
609
610	++fdchangecnt;
611	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612	fdchanges [fdchangecnt - 1] = w->fd;
613	}
614
615	void
616	evtimer_start (struct ev_timer *w)
617	{
618	if (ev_is_active (w))
619	return;
620
621	if (w->is_abs)
622	{	1490	{
623	/* this formula differs from the one in timer_reify becuse we do not round up */
624	if (w->repeat)	1491	if (w->repeat)
625	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
626
627	ev_start ((W)w, ++atimercnt);
628	array_needsize (atimers, atimermax, atimercnt, );
629	atimers [atimercnt - 1] = w;
630	upheap (atimers, atimercnt - 1);
631	}
632	else
633	{
634	w->at += now;
635
636	ev_start ((W)w, ++rtimercnt);
637	array_needsize (rtimers, rtimermax, rtimercnt, );
638	rtimers [rtimercnt - 1] = w;
639	upheap (rtimers, rtimercnt - 1);
640	}
641
642	}
643
644	void
645	evtimer_stop (struct ev_timer *w)
646	{
647	if (!ev_is_active (w))
648	return;
649
650	if (w->is_abs)
651	{
652	if (w->active < atimercnt--)
653	{	1492	{
654	atimers [w->active - 1] = atimers [atimercnt];	1493	((WT)w)->at = mn_now + w->repeat;
655	downheap (atimers, atimercnt, w->active - 1);	1494	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
656	}	1495	}
657	}
658	else	1496	else
		1497	ev_timer_stop (EV_A_ w);
659	{	1498	}
660	if (w->active < rtimercnt--)	1499	else if (w->repeat)
661	{
662	rtimers [w->active - 1] = rtimers [rtimercnt];
663	downheap (rtimers, rtimercnt, w->active - 1);
664	}
665	}	1500	{
		1501	w->at = w->repeat;
		1502	ev_timer_start (EV_A_ w);
		1503	}
		1504	}
666		1505
		1506	#if EV_PERIODIC_ENABLE
		1507	void
		1508	ev_periodic_start (EV_P_ ev_periodic *w)
		1509	{
		1510	if (expect_false (ev_is_active (w)))
		1511	return;
		1512
		1513	if (w->reschedule_cb)
		1514	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1515	else if (w->interval)
		1516	{
		1517	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1518	/* this formula differs from the one in periodic_reify because we do not always round up */
		1519	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1520	}
		1521
		1522	ev_start (EV_A_ (W)w, ++periodiccnt);
		1523	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1524	periodics [periodiccnt - 1] = w;
		1525	upheap ((WT *)periodics, periodiccnt - 1);
		1526
		1527	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1528	}
		1529
		1530	void
		1531	ev_periodic_stop (EV_P_ ev_periodic *w)
		1532	{
		1533	ev_clear_pending (EV_A_ (W)w);
		1534	if (expect_false (!ev_is_active (w)))
		1535	return;
		1536
		1537	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1538
		1539	if (expect_true (((W)w)->active < periodiccnt--))
		1540	{
		1541	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1542	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1543	}
		1544
667	ev_stop ((W)w);	1545	ev_stop (EV_A_ (W)w);
668	}	1546	}
669		1547
670	void	1548	void
		1549	ev_periodic_again (EV_P_ ev_periodic *w)
		1550	{
		1551	/* TODO: use adjustheap and recalculation */
		1552	ev_periodic_stop (EV_A_ w);
		1553	ev_periodic_start (EV_A_ w);
		1554	}
		1555	#endif
		1556
		1557	void
		1558	ev_idle_start (EV_P_ ev_idle *w)
		1559	{
		1560	if (expect_false (ev_is_active (w)))
		1561	return;
		1562
		1563	ev_start (EV_A_ (W)w, ++idlecnt);
		1564	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1565	idles [idlecnt - 1] = w;
		1566	}
		1567
		1568	void
		1569	ev_idle_stop (EV_P_ ev_idle *w)
		1570	{
		1571	ev_clear_pending (EV_A_ (W)w);
		1572	if (expect_false (!ev_is_active (w)))
		1573	return;
		1574
		1575	{
		1576	int active = ((W)w)->active;
		1577	idles [active - 1] = idles [--idlecnt];
		1578	((W)idles [active - 1])->active = active;
		1579	}
		1580
		1581	ev_stop (EV_A_ (W)w);
		1582	}
		1583
		1584	void
		1585	ev_prepare_start (EV_P_ ev_prepare *w)
		1586	{
		1587	if (expect_false (ev_is_active (w)))
		1588	return;
		1589
		1590	ev_start (EV_A_ (W)w, ++preparecnt);
		1591	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1592	prepares [preparecnt - 1] = w;
		1593	}
		1594
		1595	void
		1596	ev_prepare_stop (EV_P_ ev_prepare *w)
		1597	{
		1598	ev_clear_pending (EV_A_ (W)w);
		1599	if (expect_false (!ev_is_active (w)))
		1600	return;
		1601
		1602	{
		1603	int active = ((W)w)->active;
		1604	prepares [active - 1] = prepares [--preparecnt];
		1605	((W)prepares [active - 1])->active = active;
		1606	}
		1607
		1608	ev_stop (EV_A_ (W)w);
		1609	}
		1610
		1611	void
		1612	ev_check_start (EV_P_ ev_check *w)
		1613	{
		1614	if (expect_false (ev_is_active (w)))
		1615	return;
		1616
		1617	ev_start (EV_A_ (W)w, ++checkcnt);
		1618	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1619	checks [checkcnt - 1] = w;
		1620	}
		1621
		1622	void
		1623	ev_check_stop (EV_P_ ev_check *w)
		1624	{
		1625	ev_clear_pending (EV_A_ (W)w);
		1626	if (expect_false (!ev_is_active (w)))
		1627	return;
		1628
		1629	{
		1630	int active = ((W)w)->active;
		1631	checks [active - 1] = checks [--checkcnt];
		1632	((W)checks [active - 1])->active = active;
		1633	}
		1634
		1635	ev_stop (EV_A_ (W)w);
		1636	}
		1637
		1638	#ifndef SA_RESTART
		1639	# define SA_RESTART 0
		1640	#endif
		1641
		1642	void
671	evsignal_start (struct ev_signal *w)	1643	ev_signal_start (EV_P_ ev_signal *w)
672	{	1644	{
		1645	#if EV_MULTIPLICITY
		1646	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1647	#endif
673	if (ev_is_active (w))	1648	if (expect_false (ev_is_active (w)))
674	return;	1649	return;
675		1650
		1651	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1652
676	ev_start ((W)w, 1);	1653	ev_start (EV_A_ (W)w, 1);
677	array_needsize (signals, signalmax, w->signum, signals_init);	1654	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
678	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1655	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679		1656
680	if (!w->next)	1657	if (!((WL)w)->next)
681	{	1658	{
		1659	#if _WIN32
		1660	signal (w->signum, sighandler);
		1661	#else
682	struct sigaction sa;	1662	struct sigaction sa;
683	sa.sa_handler = sighandler;	1663	sa.sa_handler = sighandler;
684	sigfillset (&sa.sa_mask);	1664	sigfillset (&sa.sa_mask);
685	sa.sa_flags = 0;	1665	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
686	sigaction (w->signum, &sa, 0);	1666	sigaction (w->signum, &sa, 0);
		1667	#endif
687	}	1668	}
688	}	1669	}
689		1670
690	void	1671	void
691	evsignal_stop (struct ev_signal *w)	1672	ev_signal_stop (EV_P_ ev_signal *w)
692	{	1673	{
		1674	ev_clear_pending (EV_A_ (W)w);
693	if (!ev_is_active (w))	1675	if (expect_false (!ev_is_active (w)))
694	return;	1676	return;
695		1677
696	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1678	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697	ev_stop ((W)w);	1679	ev_stop (EV_A_ (W)w);
698		1680
699	if (!signals [w->signum - 1].head)	1681	if (!signals [w->signum - 1].head)
700	signal (w->signum, SIG_DFL);	1682	signal (w->signum, SIG_DFL);
701	}	1683	}
702		1684
703	void evidle_start (struct ev_idle *w)	1685	void
		1686	ev_child_start (EV_P_ ev_child *w)
704	{	1687	{
		1688	#if EV_MULTIPLICITY
		1689	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1690	#endif
705	if (ev_is_active (w))	1691	if (expect_false (ev_is_active (w)))
706	return;	1692	return;
707		1693
708	ev_start ((W)w, ++idlecnt);	1694	ev_start (EV_A_ (W)w, 1);
709	array_needsize (idles, idlemax, idlecnt, );	1695	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
710	idles [idlecnt - 1] = w;
711	}	1696	}
712		1697
713	void evidle_stop (struct ev_idle *w)	1698	void
		1699	ev_child_stop (EV_P_ ev_child *w)
714	{	1700	{
715	idles [w->active - 1] = idles [--idlecnt];	1701	ev_clear_pending (EV_A_ (W)w);
		1702	if (expect_false (!ev_is_active (w)))
		1703	return;
		1704
		1705	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
716	ev_stop ((W)w);	1706	ev_stop (EV_A_ (W)w);
717	}	1707	}
718		1708
719	void evcheck_start (struct ev_check *w)	1709	#if EV_EMBED_ENABLE
		1710	void noinline
		1711	ev_embed_sweep (EV_P_ ev_embed *w)
720	{	1712	{
		1713	ev_loop (w->loop, EVLOOP_NONBLOCK);
		1714	}
		1715
		1716	static void
		1717	embed_cb (EV_P_ ev_io *io, int revents)
		1718	{
		1719	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		1720
721	if (ev_is_active (w))	1721	if (ev_cb (w))
722	return;	1722	ev_feed_event (EV_A_ (W)w, EV_EMBED);
723		1723	else
724	ev_start ((W)w, ++checkcnt);	1724	ev_embed_sweep (loop, w);
725	array_needsize (checks, checkmax, checkcnt, );
726	checks [checkcnt - 1] = w;
727	}	1725	}
728		1726
729	void evcheck_stop (struct ev_check *w)	1727	void
		1728	ev_embed_start (EV_P_ ev_embed *w)
730	{	1729	{
731	checks [w->active - 1] = checks [--checkcnt];	1730	if (expect_false (ev_is_active (w)))
		1731	return;
		1732
		1733	{
		1734	struct ev_loop *loop = w->loop;
		1735	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		1736	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		1737	}
		1738
		1739	ev_set_priority (&w->io, ev_priority (w));
		1740	ev_io_start (EV_A_ &w->io);
		1741
		1742	ev_start (EV_A_ (W)w, 1);
		1743	}
		1744
		1745	void
		1746	ev_embed_stop (EV_P_ ev_embed *w)
		1747	{
		1748	ev_clear_pending (EV_A_ (W)w);
		1749	if (expect_false (!ev_is_active (w)))
		1750	return;
		1751
		1752	ev_io_stop (EV_A_ &w->io);
		1753
732	ev_stop ((W)w);	1754	ev_stop (EV_A_ (W)w);
733	}	1755	}
		1756	#endif
		1757
		1758	#if EV_STAT_ENABLE
		1759
		1760	# ifdef _WIN32
		1761	# define lstat(a,b) stat(a,b)
		1762	# endif
		1763
		1764	void
		1765	ev_stat_stat (EV_P_ ev_stat *w)
		1766	{
		1767	if (lstat (w->path, &w->attr) < 0)
		1768	w->attr.st_nlink = 0;
		1769	else if (!w->attr.st_nlink)
		1770	w->attr.st_nlink = 1;
		1771	}
		1772
		1773	static void
		1774	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1775	{
		1776	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1777
		1778	/* we copy this here each the time so that */
		1779	/* prev has the old value when the callback gets invoked */
		1780	w->prev = w->attr;
		1781	ev_stat_stat (EV_A_ w);
		1782
		1783	if (memcmp (&w->prev, &w->attr, sizeof (ev_statdata)))
		1784	ev_feed_event (EV_A_ w, EV_STAT);
		1785	}
		1786
		1787	void
		1788	ev_stat_start (EV_P_ ev_stat *w)
		1789	{
		1790	if (expect_false (ev_is_active (w)))
		1791	return;
		1792
		1793	/* since we use memcmp, we need to clear any padding data etc. */
		1794	memset (&w->prev, 0, sizeof (ev_statdata));
		1795	memset (&w->attr, 0, sizeof (ev_statdata));
		1796
		1797	ev_stat_stat (EV_A_ w);
		1798
		1799	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		1800	ev_set_priority (&w->timer, ev_priority (w));
		1801	ev_timer_start (EV_A_ &w->timer);
		1802
		1803	ev_start (EV_A_ (W)w, 1);
		1804	}
		1805
		1806	void
		1807	ev_stat_stop (EV_P_ ev_stat *w)
		1808	{
		1809	ev_clear_pending (EV_A_ (W)w);
		1810	if (expect_false (!ev_is_active (w)))
		1811	return;
		1812
		1813	ev_timer_stop (EV_A_ &w->timer);
		1814
		1815	ev_stop (EV_A_ (W)w);
		1816	}
		1817	#endif
734		1818
735	/*****************************************************************************/	1819	/*****************************************************************************/
736		1820
737	#if 0	1821	struct ev_once
		1822	{
		1823	ev_io io;
		1824	ev_timer to;
		1825	void (*cb)(int revents, void *arg);
		1826	void *arg;
		1827	};
738		1828
739	static void	1829	static void
740	sin_cb (struct ev_io *w, int revents)	1830	once_cb (EV_P_ struct ev_once *once, int revents)
741	{	1831	{
742	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1832	void (*cb)(int revents, void *arg) = once->cb;
		1833	void *arg = once->arg;
		1834
		1835	ev_io_stop (EV_A_ &once->io);
		1836	ev_timer_stop (EV_A_ &once->to);
		1837	ev_free (once);
		1838
		1839	cb (revents, arg);
743	}	1840	}
744		1841
745	static void	1842	static void
746	ocb (struct ev_timer *w, int revents)	1843	once_cb_io (EV_P_ ev_io *w, int revents)
747	{	1844	{
748	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1845	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
749	evtimer_stop (w);
750	evtimer_start (w);
751	}	1846	}
752		1847
753	static void	1848	static void
754	scb (struct ev_signal *w, int revents)	1849	once_cb_to (EV_P_ ev_timer *w, int revents)
755	{	1850	{
756	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1851	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
757	}	1852	}
758		1853
759	static void	1854	void
760	gcb (struct ev_signal *w, int revents)	1855	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
761	{	1856	{
762	fprintf (stderr, "generic %x\n", revents);	1857	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
763	}
764		1858
765	int main (void)	1859	if (expect_false (!once))
766	{
767	struct ev_io sin;
768
769	ev_init (0);
770
771	evw_init (&sin, sin_cb, 55);
772	evio_set (&sin, 0, EV_READ);
773	evio_start (&sin);
774
775	struct ev_timer t[10000];
776
777	#if 0
778	int i;
779	for (i = 0; i < 10000; ++i)
780	{
781	struct ev_timer *w = t + i;
782	evw_init (w, ocb, i);
783	evtimer_set_abs (w, drand48 (), 0.99775533);
784	evtimer_start (w);
785	if (drand48 () < 0.5)
786	evtimer_stop (w);
787	}	1860	{
788	#endif	1861	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
789
790	struct ev_timer t1;
791	evw_init (&t1, ocb, 0);
792	evtimer_set_abs (&t1, 5, 10);
793	evtimer_start (&t1);
794
795	struct ev_signal sig;
796	evw_init (&sig, scb, 65535);
797	evsignal_set (&sig, SIGQUIT);
798	evsignal_start (&sig);
799
800	struct ev_check cw;
801	evw_init (&cw, gcb, 0);
802	evcheck_start (&cw);
803
804	struct ev_idle iw;
805	evw_init (&iw, gcb, 0);
806	evidle_start (&iw);
807
808	ev_loop (0);
809
810	return 0;	1862	return;
811	}	1863	}
812		1864
813	#endif	1865	once->cb = cb;
		1866	once->arg = arg;
814		1867
		1868	ev_init (&once->io, once_cb_io);
		1869	if (fd >= 0)
		1870	{
		1871	ev_io_set (&once->io, fd, events);
		1872	ev_io_start (EV_A_ &once->io);
		1873	}
815		1874
		1875	ev_init (&once->to, once_cb_to);
		1876	if (timeout >= 0.)
		1877	{
		1878	ev_timer_set (&once->to, timeout, 0.);
		1879	ev_timer_start (EV_A_ &once->to);
		1880	}
		1881	}
816		1882
		1883	#ifdef __cplusplus
		1884	}
		1885	#endif
817		1886

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