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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.161 by root, Sat Dec 1 23:43:45 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# ifdef EV_CONFIG_H
		38	# include EV_CONFIG_H
		39	# else
		40	# include "config.h"
		41	# endif
		42
		43	# if HAVE_CLOCK_GETTIME
		44	# ifndef EV_USE_MONOTONIC
		45	# define EV_USE_MONOTONIC 1
		46	# endif
		47	# ifndef EV_USE_REALTIME
		48	# define EV_USE_REALTIME 1
		49	# endif
		50	# else
		51	# ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 0
		53	# endif
		54	# ifndef EV_USE_REALTIME
		55	# define EV_USE_REALTIME 0
		56	# endif
		57	# endif
		58
		59	# ifndef EV_USE_SELECT
		60	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		61	# define EV_USE_SELECT 1
		62	# else
		63	# define EV_USE_SELECT 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_POLL
		68	# if HAVE_POLL && HAVE_POLL_H
		69	# define EV_USE_POLL 1
		70	# else
		71	# define EV_USE_POLL 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_EPOLL
		76	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		77	# define EV_USE_EPOLL 1
		78	# else
		79	# define EV_USE_EPOLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_KQUEUE
		84	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		85	# define EV_USE_KQUEUE 1
		86	# else
		87	# define EV_USE_KQUEUE 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_PORT
		92	# if HAVE_PORT_H && HAVE_PORT_CREATE
		93	# define EV_USE_PORT 1
		94	# else
		95	# define EV_USE_PORT 0
		96	# endif
		97	# endif
		98
		99	# ifndef EV_USE_INOTIFY
		100	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		101	# define EV_USE_INOTIFY 1
		102	# else
		103	# define EV_USE_INOTIFY 0
		104	# endif
		105	# endif
		106
		107	#endif
		108
1	#include <math.h>	109	#include <math.h>
2	#include <stdlib.h>	110	#include <stdlib.h>
		111	#include <fcntl.h>
		112	#include <stddef.h>
3		113
4	#include <stdio.h>	114	#include <stdio.h>
5		115
6	#include <assert.h>	116	#include <assert.h>
7	#include <errno.h>	117	#include <errno.h>
8	#include <sys/time.h>	118	#include <sys/types.h>
9	#include <time.h>	119	#include <time.h>
10		120
		121	#include <signal.h>
		122
		123	#ifdef EV_H
		124	# include EV_H
		125	#else
		126	# include "ev.h"
		127	#endif
		128
		129	#ifndef _WIN32
		130	# include <sys/time.h>
		131	# include <sys/wait.h>
		132	# include <unistd.h>
		133	#else
		134	# define WIN32_LEAN_AND_MEAN
		135	# include <windows.h>
		136	# ifndef EV_SELECT_IS_WINSOCKET
		137	# define EV_SELECT_IS_WINSOCKET 1
		138	# endif
		139	#endif
		140
		141	/**/
		142
		143	#ifndef EV_USE_MONOTONIC
		144	# define EV_USE_MONOTONIC 0
		145	#endif
		146
		147	#ifndef EV_USE_REALTIME
		148	# define EV_USE_REALTIME 0
		149	#endif
		150
		151	#ifndef EV_USE_SELECT
		152	# define EV_USE_SELECT 1
		153	#endif
		154
		155	#ifndef EV_USE_POLL
		156	# ifdef _WIN32
		157	# define EV_USE_POLL 0
		158	# else
		159	# define EV_USE_POLL 1
		160	# endif
		161	#endif
		162
		163	#ifndef EV_USE_EPOLL
		164	# define EV_USE_EPOLL 0
		165	#endif
		166
		167	#ifndef EV_USE_KQUEUE
		168	# define EV_USE_KQUEUE 0
		169	#endif
		170
		171	#ifndef EV_USE_PORT
		172	# define EV_USE_PORT 0
		173	#endif
		174
		175	#ifndef EV_USE_INOTIFY
		176	# define EV_USE_INOTIFY 0
		177	#endif
		178
		179	#ifndef EV_PID_HASHSIZE
		180	# if EV_MINIMAL
		181	# define EV_PID_HASHSIZE 1
		182	# else
		183	# define EV_PID_HASHSIZE 16
		184	# endif
		185	#endif
		186
		187	#ifndef EV_INOTIFY_HASHSIZE
		188	# if EV_MINIMAL
		189	# define EV_INOTIFY_HASHSIZE 1
		190	# else
		191	# define EV_INOTIFY_HASHSIZE 16
		192	# endif
		193	#endif
		194
		195	/**/
		196
11	#ifdef CLOCK_MONOTONIC	197	#ifndef CLOCK_MONOTONIC
		198	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	199	# define EV_USE_MONOTONIC 0
13	#endif	200	#endif
14		201
15	#define HAVE_EPOLL 1	202	#ifndef CLOCK_REALTIME
		203	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	204	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 1	205	#endif
		206
		207	#if EV_SELECT_IS_WINSOCKET
		208	# include <winsock.h>
		209	#endif
		210
		211	#if !EV_STAT_ENABLE
		212	# define EV_USE_INOTIFY 0
		213	#endif
		214
		215	#if EV_USE_INOTIFY
		216	# include <sys/inotify.h>
		217	#endif
		218
		219	/**/
18		220
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	221	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	222	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		223	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		224
		225	#if __GNUC__ >= 3
		226	# define expect(expr,value) __builtin_expect ((expr),(value))
		227	# define inline_size static inline /* inline for codesize */
		228	# if EV_MINIMAL
		229	# define noinline __attribute__ ((noinline))
		230	# define inline_speed static noinline
		231	# else
		232	# define noinline
		233	# define inline_speed static inline
		234	# endif
		235	#else
		236	# define expect(expr,value) (expr)
		237	# define inline_speed static
		238	# define inline_size static
		239	# define noinline
		240	#endif
		241
		242	#define expect_false(expr) expect ((expr) != 0, 0)
		243	#define expect_true(expr) expect ((expr) != 0, 1)
		244
		245	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		246	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		247
		248	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		249	#define EMPTY2(a,b) /* used to suppress some warnings */
		250
		251	typedef ev_watcher *W;
		252	typedef ev_watcher_list *WL;
		253	typedef ev_watcher_time *WT;
		254
		255	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		256
		257	#ifdef _WIN32
		258	# include "ev_win32.c"
		259	#endif
		260
		261	/*****************************************************************************/
		262
		263	static void (*syserr_cb)(const char *msg);
		264
		265	void
		266	ev_set_syserr_cb (void (*cb)(const char *msg))
		267	{
		268	syserr_cb = cb;
		269	}
		270
		271	static void noinline
		272	syserr (const char *msg)
		273	{
		274	if (!msg)
		275	msg = "(libev) system error";
		276
		277	if (syserr_cb)
		278	syserr_cb (msg);
		279	else
		280	{
		281	perror (msg);
		282	abort ();
		283	}
		284	}
		285
		286	static void *(*alloc)(void *ptr, long size);
		287
		288	void
		289	ev_set_allocator (void *(*cb)(void *ptr, long size))
		290	{
		291	alloc = cb;
		292	}
		293
		294	inline_speed void *
		295	ev_realloc (void *ptr, long size)
		296	{
		297	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		298
		299	if (!ptr && size)
		300	{
		301	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		302	abort ();
		303	}
		304
		305	return ptr;
		306	}
		307
		308	#define ev_malloc(size) ev_realloc (0, (size))
		309	#define ev_free(ptr) ev_realloc ((ptr), 0)
		310
		311	/*****************************************************************************/
		312
		313	typedef struct
		314	{
		315	WL head;
		316	unsigned char events;
		317	unsigned char reify;
		318	#if EV_SELECT_IS_WINSOCKET
		319	SOCKET handle;
		320	#endif
		321	} ANFD;
		322
		323	typedef struct
		324	{
		325	W w;
		326	int events;
		327	} ANPENDING;
		328
		329	#if EV_USE_INOTIFY
		330	typedef struct
		331	{
		332	WL head;
		333	} ANFS;
		334	#endif
		335
		336	#if EV_MULTIPLICITY
		337
		338	struct ev_loop
		339	{
		340	ev_tstamp ev_rt_now;
		341	#define ev_rt_now ((loop)->ev_rt_now)
		342	#define VAR(name,decl) decl;
		343	#include "ev_vars.h"
		344	#undef VAR
		345	};
22	#include "ev.h"	346	#include "ev_wrap.h"
23		347
24	struct ev_watcher {	348	static struct ev_loop default_loop_struct;
25	EV_WATCHER (ev_watcher);	349	struct ev_loop *ev_default_loop_ptr;
26	};
27		350
28	struct ev_watcher_list {	351	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		352
32	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	353	ev_tstamp ev_rt_now;
34	int ev_method;	354	#define VAR(name,decl) static decl;
		355	#include "ev_vars.h"
		356	#undef VAR
35		357
36	static int have_monotonic; /* runtime */	358	static int ev_default_loop_ptr;
37		359
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	360	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	361
40	static void (*method_poll)(ev_tstamp timeout);	362	/*****************************************************************************/
41		363
42	ev_tstamp	364	ev_tstamp
43	ev_time (void)	365	ev_time (void)
44	{	366	{
45	#if HAVE_REALTIME	367	#if EV_USE_REALTIME
46	struct timespec ts;	368	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	369	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	370	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	371	#else
50	struct timeval tv;	372	struct timeval tv;
51	gettimeofday (&tv, 0);	373	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	374	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	375	#endif
54	}	376	}
55		377
56	static ev_tstamp	378	ev_tstamp inline_size
57	get_clock (void)	379	get_clock (void)
58	{	380	{
59	#if HAVE_MONOTONIC	381	#if EV_USE_MONOTONIC
60	if (have_monotonic)	382	if (expect_true (have_monotonic))
61	{	383	{
62	struct timespec ts;	384	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	385	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	386	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	387	}
66	#endif	388	#endif
67		389
68	return ev_time ();	390	return ev_time ();
69	}	391	}
70		392
		393	#if EV_MULTIPLICITY
		394	ev_tstamp
		395	ev_now (EV_P)
		396	{
		397	return ev_rt_now;
		398	}
		399	#endif
		400
		401	#define array_roundsize(type,n) (((n) | 4) & ~3)
		402
71	#define array_needsize(base,cur,cnt,init) \	403	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	404	if (expect_false ((cnt) > cur)) \
73	{ \	405	{ \
74	int newcnt = cur ? cur << 1 : 16; \	406	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	407	do \
		408	{ \
		409	newcnt = array_roundsize (type, newcnt << 1); \
		410	} \
		411	while ((cnt) > newcnt); \
		412	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	413	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	414	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	415	cur = newcnt; \
		416	}
		417
		418	#define array_slim(type,stem) \
		419	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		420	{ \
		421	stem ## max = array_roundsize (stem ## cnt >> 1); \
		422	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		423	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		424	}
		425
		426	#define array_free(stem, idx) \
		427	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		428
		429	/*****************************************************************************/
		430
		431	void noinline
		432	ev_feed_event (EV_P_ void *w, int revents)
		433	{
		434	W w_ = (W)w;
		435
		436	if (expect_false (w_->pending))
79	}	437	{
		438	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		439	return;
		440	}
80		441
81	typedef struct	442	w_->pending = ++pendingcnt [ABSPRI (w_)];
82	{	443	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
83	struct ev_io *head;	444	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
84	unsigned char wev, rev; /* want, received event set */	445	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
85	} ANFD;	446	}
86		447
87	static ANFD *anfds;	448	void inline_size
88	static int anfdmax;	449	queue_events (EV_P_ W *events, int eventcnt, int type)
		450	{
		451	int i;
89		452
90	static int *fdchanges;	453	for (i = 0; i < eventcnt; ++i)
91	static int fdchangemax, fdchangecnt;	454	ev_feed_event (EV_A_ events [i], type);
		455	}
92		456
93	static void	457	/*****************************************************************************/
		458
		459	void inline_size
94	anfds_init (ANFD *base, int count)	460	anfds_init (ANFD *base, int count)
95	{	461	{
96	while (count--)	462	while (count--)
97	{	463	{
98	base->head = 0;	464	base->head = 0;
99	base->wev = base->rev = EV_NONE;	465	base->events = EV_NONE;
		466	base->reify = 0;
		467
100	++base;	468	++base;
101	}	469	}
102	}	470	}
103		471
104	typedef struct	472	void inline_speed
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;
117	array_needsize (pendings, pendingmax, pendingcnt, );
118	pendings [pendingcnt - 1].w = w;
119	pendings [pendingcnt - 1].events = events;
120	}
121
122	static void
123	fd_event (int fd, int events)	473	fd_event (EV_P_ int fd, int revents)
124	{	474	{
125	ANFD *anfd = anfds + fd;	475	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	476	ev_io *w;
127		477
128	for (w = anfd->head; w; w = w->next)	478	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129	{	479	{
130	int ev = w->events & events;	480	int ev = w->events & revents;
131		481
132	if (ev)	482	if (ev)
133	event ((struct ev_watcher *)w, ev);	483	ev_feed_event (EV_A_ (W)w, ev);
134	}
135	}
136
137	static struct ev_timer **atimers;
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{	484	}
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	485	}
159		486
160	static void	487	void
161	downheap (struct ev_timer **timers, int N, int k)	488	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	489	{
163	struct ev_timer *w = timers [k];	490	fd_event (EV_A_ fd, revents);
164
165	while (k < (N >> 1))
166	{
167	int j = k << 1;
168
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	++j;
171
172	if (w->at <= timers [j]->at)
173	break;
174
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}	491	}
183		492
184	static struct ev_signal **signals;	493	void inline_size
185	static int signalmax;	494	fd_reify (EV_P)
186
187	static void
188	signals_init (struct ev_signal **base, int count)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL
195	# include "ev_epoll.c"
196	#endif
197	#if HAVE_SELECT
198	# include "ev_select.c"
199	#endif
200
201	int ev_init (int flags)
202	{
203	#if HAVE_MONOTONIC
204	{
205	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;
208	}
209	#endif
210
211	ev_now = ev_time ();
212	now = get_clock ();
213	diff = ev_now - now;
214
215	#if HAVE_EPOLL
216	if (epoll_init (flags))
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();
241	#endif
242	}
243
244	static void
245	fd_reify (void)
246	{	495	{
247	int i;	496	int i;
248		497
249	for (i = 0; i < fdchangecnt; ++i)	498	for (i = 0; i < fdchangecnt; ++i)
250	{	499	{
251	int fd = fdchanges [i];	500	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	501	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	502	ev_io *w;
254		503
255	int wev = 0;	504	int events = 0;
256		505
257	for (w = anfd->head; w; w = w->next)	506	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
258	wev |= w->events;	507	events |= w->events;
259		508
260	if (anfd->wev != wev)	509	#if EV_SELECT_IS_WINSOCKET
		510	if (events)
261	{	511	{
262	method_modify (fd, anfd->wev, wev);	512	unsigned long argp;
263	anfd->wev = wev;	513	anfd->handle = _get_osfhandle (fd);
		514	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	515	}
		516	#endif
		517
		518	anfd->reify = 0;
		519
		520	backend_modify (EV_A_ fd, anfd->events, events);
		521	anfd->events = events;
265	}	522	}
266		523
267	fdchangecnt = 0;	524	fdchangecnt = 0;
268	}	525	}
269		526
		527	void inline_size
		528	fd_change (EV_P_ int fd)
		529	{
		530	if (expect_false (anfds [fd].reify))
		531	return;
		532
		533	anfds [fd].reify = 1;
		534
		535	++fdchangecnt;
		536	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		537	fdchanges [fdchangecnt - 1] = fd;
		538	}
		539
		540	void inline_speed
		541	fd_kill (EV_P_ int fd)
		542	{
		543	ev_io *w;
		544
		545	while ((w = (ev_io *)anfds [fd].head))
		546	{
		547	ev_io_stop (EV_A_ w);
		548	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		549	}
		550	}
		551
		552	int inline_size
		553	fd_valid (int fd)
		554	{
		555	#ifdef _WIN32
		556	return _get_osfhandle (fd) != -1;
		557	#else
		558	return fcntl (fd, F_GETFD) != -1;
		559	#endif
		560	}
		561
		562	/* called on EBADF to verify fds */
		563	static void noinline
		564	fd_ebadf (EV_P)
		565	{
		566	int fd;
		567
		568	for (fd = 0; fd < anfdmax; ++fd)
		569	if (anfds [fd].events)
		570	if (!fd_valid (fd) == -1 && errno == EBADF)
		571	fd_kill (EV_A_ fd);
		572	}
		573
		574	/* called on ENOMEM in select/poll to kill some fds and retry */
		575	static void noinline
		576	fd_enomem (EV_P)
		577	{
		578	int fd;
		579
		580	for (fd = anfdmax; fd--; )
		581	if (anfds [fd].events)
		582	{
		583	fd_kill (EV_A_ fd);
		584	return;
		585	}
		586	}
		587
		588	/* usually called after fork if backend needs to re-arm all fds from scratch */
		589	static void noinline
		590	fd_rearm_all (EV_P)
		591	{
		592	int fd;
		593
		594	for (fd = 0; fd < anfdmax; ++fd)
		595	if (anfds [fd].events)
		596	{
		597	anfds [fd].events = 0;
		598	fd_change (EV_A_ fd);
		599	}
		600	}
		601
		602	/*****************************************************************************/
		603
		604	void inline_speed
		605	upheap (WT *heap, int k)
		606	{
		607	WT w = heap [k];
		608
		609	while (k && heap [k >> 1]->at > w->at)
		610	{
		611	heap [k] = heap [k >> 1];
		612	((W)heap [k])->active = k + 1;
		613	k >>= 1;
		614	}
		615
		616	heap [k] = w;
		617	((W)heap [k])->active = k + 1;
		618
		619	}
		620
		621	void inline_speed
		622	downheap (WT *heap, int N, int k)
		623	{
		624	WT w = heap [k];
		625
		626	while (k < (N >> 1))
		627	{
		628	int j = k << 1;
		629
		630	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		631	++j;
		632
		633	if (w->at <= heap [j]->at)
		634	break;
		635
		636	heap [k] = heap [j];
		637	((W)heap [k])->active = k + 1;
		638	k = j;
		639	}
		640
		641	heap [k] = w;
		642	((W)heap [k])->active = k + 1;
		643	}
		644
		645	void inline_size
		646	adjustheap (WT *heap, int N, int k)
		647	{
		648	upheap (heap, k);
		649	downheap (heap, N, k);
		650	}
		651
		652	/*****************************************************************************/
		653
		654	typedef struct
		655	{
		656	WL head;
		657	sig_atomic_t volatile gotsig;
		658	} ANSIG;
		659
		660	static ANSIG *signals;
		661	static int signalmax;
		662
		663	static int sigpipe [2];
		664	static sig_atomic_t volatile gotsig;
		665	static ev_io sigev;
		666
		667	void inline_size
		668	signals_init (ANSIG *base, int count)
		669	{
		670	while (count--)
		671	{
		672	base->head = 0;
		673	base->gotsig = 0;
		674
		675	++base;
		676	}
		677	}
		678
270	static void	679	static void
271	call_pending ()	680	sighandler (int signum)
		681	{
		682	#if _WIN32
		683	signal (signum, sighandler);
		684	#endif
		685
		686	signals [signum - 1].gotsig = 1;
		687
		688	if (!gotsig)
		689	{
		690	int old_errno = errno;
		691	gotsig = 1;
		692	write (sigpipe [1], &signum, 1);
		693	errno = old_errno;
		694	}
		695	}
		696
		697	void noinline
		698	ev_feed_signal_event (EV_P_ int signum)
		699	{
		700	WL w;
		701
		702	#if EV_MULTIPLICITY
		703	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		704	#endif
		705
		706	--signum;
		707
		708	if (signum < 0 || signum >= signalmax)
		709	return;
		710
		711	signals [signum].gotsig = 0;
		712
		713	for (w = signals [signum].head; w; w = w->next)
		714	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		715	}
		716
		717	static void
		718	sigcb (EV_P_ ev_io *iow, int revents)
		719	{
		720	int signum;
		721
		722	read (sigpipe [0], &revents, 1);
		723	gotsig = 0;
		724
		725	for (signum = signalmax; signum--; )
		726	if (signals [signum].gotsig)
		727	ev_feed_signal_event (EV_A_ signum + 1);
		728	}
		729
		730	void inline_size
		731	fd_intern (int fd)
		732	{
		733	#ifdef _WIN32
		734	int arg = 1;
		735	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		736	#else
		737	fcntl (fd, F_SETFD, FD_CLOEXEC);
		738	fcntl (fd, F_SETFL, O_NONBLOCK);
		739	#endif
		740	}
		741
		742	static void noinline
		743	siginit (EV_P)
		744	{
		745	fd_intern (sigpipe [0]);
		746	fd_intern (sigpipe [1]);
		747
		748	ev_io_set (&sigev, sigpipe [0], EV_READ);
		749	ev_io_start (EV_A_ &sigev);
		750	ev_unref (EV_A); /* child watcher should not keep loop alive */
		751	}
		752
		753	/*****************************************************************************/
		754
		755	static ev_child *childs [EV_PID_HASHSIZE];
		756
		757	#ifndef _WIN32
		758
		759	static ev_signal childev;
		760
		761	void inline_speed
		762	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		763	{
		764	ev_child *w;
		765
		766	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		767	if (w->pid == pid || !w->pid)
		768	{
		769	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		770	w->rpid = pid;
		771	w->rstatus = status;
		772	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		773	}
		774	}
		775
		776	#ifndef WCONTINUED
		777	# define WCONTINUED 0
		778	#endif
		779
		780	static void
		781	childcb (EV_P_ ev_signal *sw, int revents)
		782	{
		783	int pid, status;
		784
		785	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
		786	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		787	if (!WCONTINUED
		788	|| errno != EINVAL
		789	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		790	return;
		791
		792	/* make sure we are called again until all childs have been reaped */
		793	/* we need to do it this way so that the callback gets called before we continue */
		794	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		795
		796	child_reap (EV_A_ sw, pid, pid, status);
		797	if (EV_PID_HASHSIZE > 1)
		798	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		799	}
		800
		801	#endif
		802
		803	/*****************************************************************************/
		804
		805	#if EV_USE_PORT
		806	# include "ev_port.c"
		807	#endif
		808	#if EV_USE_KQUEUE
		809	# include "ev_kqueue.c"
		810	#endif
		811	#if EV_USE_EPOLL
		812	# include "ev_epoll.c"
		813	#endif
		814	#if EV_USE_POLL
		815	# include "ev_poll.c"
		816	#endif
		817	#if EV_USE_SELECT
		818	# include "ev_select.c"
		819	#endif
		820
		821	int
		822	ev_version_major (void)
		823	{
		824	return EV_VERSION_MAJOR;
		825	}
		826
		827	int
		828	ev_version_minor (void)
		829	{
		830	return EV_VERSION_MINOR;
		831	}
		832
		833	/* return true if we are running with elevated privileges and should ignore env variables */
		834	int inline_size
		835	enable_secure (void)
		836	{
		837	#ifdef _WIN32
		838	return 0;
		839	#else
		840	return getuid () != geteuid ()
		841	|| getgid () != getegid ();
		842	#endif
		843	}
		844
		845	unsigned int
		846	ev_supported_backends (void)
		847	{
		848	unsigned int flags = 0;
		849
		850	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		851	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		852	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		853	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		854	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		855
		856	return flags;
		857	}
		858
		859	unsigned int
		860	ev_recommended_backends (void)
		861	{
		862	unsigned int flags = ev_supported_backends ();
		863
		864	#ifndef __NetBSD__
		865	/* kqueue is borked on everything but netbsd apparently */
		866	/* it usually doesn't work correctly on anything but sockets and pipes */
		867	flags &= ~EVBACKEND_KQUEUE;
		868	#endif
		869	#ifdef __APPLE__
		870	// flags &= ~EVBACKEND_KQUEUE; for documentation
		871	flags &= ~EVBACKEND_POLL;
		872	#endif
		873
		874	return flags;
		875	}
		876
		877	unsigned int
		878	ev_embeddable_backends (void)
		879	{
		880	return EVBACKEND_EPOLL
		881	| EVBACKEND_KQUEUE
		882	| EVBACKEND_PORT;
		883	}
		884
		885	unsigned int
		886	ev_backend (EV_P)
		887	{
		888	return backend;
		889	}
		890
		891	static void noinline
		892	loop_init (EV_P_ unsigned int flags)
		893	{
		894	if (!backend)
		895	{
		896	#if EV_USE_MONOTONIC
		897	{
		898	struct timespec ts;
		899	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		900	have_monotonic = 1;
		901	}
		902	#endif
		903
		904	ev_rt_now = ev_time ();
		905	mn_now = get_clock ();
		906	now_floor = mn_now;
		907	rtmn_diff = ev_rt_now - mn_now;
		908
		909	/* pid check not overridable via env */
		910	#ifndef _WIN32
		911	if (flags & EVFLAG_FORKCHECK)
		912	curpid = getpid ();
		913	#endif
		914
		915	if (!(flags & EVFLAG_NOENV)
		916	&& !enable_secure ()
		917	&& getenv ("LIBEV_FLAGS"))
		918	flags = atoi (getenv ("LIBEV_FLAGS"));
		919
		920	if (!(flags & 0x0000ffffUL))
		921	flags |= ev_recommended_backends ();
		922
		923	backend = 0;
		924	backend_fd = -1;
		925	#if EV_USE_INOTIFY
		926	fs_fd = -2;
		927	#endif
		928
		929	#if EV_USE_PORT
		930	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		931	#endif
		932	#if EV_USE_KQUEUE
		933	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		934	#endif
		935	#if EV_USE_EPOLL
		936	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		937	#endif
		938	#if EV_USE_POLL
		939	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		940	#endif
		941	#if EV_USE_SELECT
		942	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		943	#endif
		944
		945	ev_init (&sigev, sigcb);
		946	ev_set_priority (&sigev, EV_MAXPRI);
		947	}
		948	}
		949
		950	static void noinline
		951	loop_destroy (EV_P)
272	{	952	{
273	int i;	953	int i;
274		954
275	for (i = 0; i < pendingcnt; ++i)	955	#if EV_USE_INOTIFY
		956	if (fs_fd >= 0)
		957	close (fs_fd);
		958	#endif
		959
		960	if (backend_fd >= 0)
		961	close (backend_fd);
		962
		963	#if EV_USE_PORT
		964	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		965	#endif
		966	#if EV_USE_KQUEUE
		967	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		968	#endif
		969	#if EV_USE_EPOLL
		970	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		971	#endif
		972	#if EV_USE_POLL
		973	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		974	#endif
		975	#if EV_USE_SELECT
		976	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		977	#endif
		978
		979	for (i = NUMPRI; i--; )
		980	array_free (pending, [i]);
		981
		982	/* have to use the microsoft-never-gets-it-right macro */
		983	array_free (fdchange, EMPTY0);
		984	array_free (timer, EMPTY0);
		985	#if EV_PERIODIC_ENABLE
		986	array_free (periodic, EMPTY0);
		987	#endif
		988	array_free (idle, EMPTY0);
		989	array_free (prepare, EMPTY0);
		990	array_free (check, EMPTY0);
		991
		992	backend = 0;
		993	}
		994
		995	void inline_size infy_fork (EV_P);
		996
		997	void inline_size
		998	loop_fork (EV_P)
		999	{
		1000	#if EV_USE_PORT
		1001	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1002	#endif
		1003	#if EV_USE_KQUEUE
		1004	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1005	#endif
		1006	#if EV_USE_EPOLL
		1007	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1008	#endif
		1009	#if EV_USE_INOTIFY
		1010	infy_fork (EV_A);
		1011	#endif
		1012
		1013	if (ev_is_active (&sigev))
		1014	{
		1015	/* default loop */
		1016
		1017	ev_ref (EV_A);
		1018	ev_io_stop (EV_A_ &sigev);
		1019	close (sigpipe [0]);
		1020	close (sigpipe [1]);
		1021
		1022	while (pipe (sigpipe))
		1023	syserr ("(libev) error creating pipe");
		1024
		1025	siginit (EV_A);
276	{	1026	}
277	ANPENDING *p = pendings + i;
278		1027
279	if (p->w)	1028	postfork = 0;
		1029	}
		1030
		1031	#if EV_MULTIPLICITY
		1032	struct ev_loop *
		1033	ev_loop_new (unsigned int flags)
		1034	{
		1035	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1036
		1037	memset (loop, 0, sizeof (struct ev_loop));
		1038
		1039	loop_init (EV_A_ flags);
		1040
		1041	if (ev_backend (EV_A))
		1042	return loop;
		1043
		1044	return 0;
		1045	}
		1046
		1047	void
		1048	ev_loop_destroy (EV_P)
		1049	{
		1050	loop_destroy (EV_A);
		1051	ev_free (loop);
		1052	}
		1053
		1054	void
		1055	ev_loop_fork (EV_P)
		1056	{
		1057	postfork = 1;
		1058	}
		1059
		1060	#endif
		1061
		1062	#if EV_MULTIPLICITY
		1063	struct ev_loop *
		1064	ev_default_loop_init (unsigned int flags)
		1065	#else
		1066	int
		1067	ev_default_loop (unsigned int flags)
		1068	#endif
		1069	{
		1070	if (sigpipe [0] == sigpipe [1])
		1071	if (pipe (sigpipe))
		1072	return 0;
		1073
		1074	if (!ev_default_loop_ptr)
		1075	{
		1076	#if EV_MULTIPLICITY
		1077	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1078	#else
		1079	ev_default_loop_ptr = 1;
		1080	#endif
		1081
		1082	loop_init (EV_A_ flags);
		1083
		1084	if (ev_backend (EV_A))
280	{	1085	{
281	p->w->pending = 0;	1086	siginit (EV_A);
282	p->w->cb (p->w, p->events);	1087
		1088	#ifndef _WIN32
		1089	ev_signal_init (&childev, childcb, SIGCHLD);
		1090	ev_set_priority (&childev, EV_MAXPRI);
		1091	ev_signal_start (EV_A_ &childev);
		1092	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1093	#endif
283	}	1094	}
		1095	else
		1096	ev_default_loop_ptr = 0;
		1097	}
		1098
		1099	return ev_default_loop_ptr;
		1100	}
		1101
		1102	void
		1103	ev_default_destroy (void)
		1104	{
		1105	#if EV_MULTIPLICITY
		1106	struct ev_loop *loop = ev_default_loop_ptr;
		1107	#endif
		1108
		1109	#ifndef _WIN32
		1110	ev_ref (EV_A); /* child watcher */
		1111	ev_signal_stop (EV_A_ &childev);
		1112	#endif
		1113
		1114	ev_ref (EV_A); /* signal watcher */
		1115	ev_io_stop (EV_A_ &sigev);
		1116
		1117	close (sigpipe [0]); sigpipe [0] = 0;
		1118	close (sigpipe [1]); sigpipe [1] = 0;
		1119
		1120	loop_destroy (EV_A);
		1121	}
		1122
		1123	void
		1124	ev_default_fork (void)
		1125	{
		1126	#if EV_MULTIPLICITY
		1127	struct ev_loop *loop = ev_default_loop_ptr;
		1128	#endif
		1129
		1130	if (backend)
		1131	postfork = 1;
		1132	}
		1133
		1134	/*****************************************************************************/
		1135
		1136	int inline_size
		1137	any_pending (EV_P)
		1138	{
		1139	int pri;
		1140
		1141	for (pri = NUMPRI; pri--; )
		1142	if (pendingcnt [pri])
		1143	return 1;
		1144
		1145	return 0;
		1146	}
		1147
		1148	void inline_speed
		1149	call_pending (EV_P)
		1150	{
		1151	int pri;
		1152
		1153	for (pri = NUMPRI; pri--; )
		1154	while (pendingcnt [pri])
		1155	{
		1156	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1157
		1158	if (expect_true (p->w))
		1159	{
		1160	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1161
		1162	p->w->pending = 0;
		1163	EV_CB_INVOKE (p->w, p->events);
		1164	}
284	}	1165	}
285
286	pendingcnt = 0;
287	}	1166	}
288		1167
289	static void	1168	void inline_size
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1169	timers_reify (EV_P)
291	{	1170	{
292	while (timercnt && timers [0]->at <= now)	1171	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1172	{
294	struct ev_timer *w = timers [0];	1173	ev_timer *w = timers [0];
		1174
		1175	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
295		1176
296	/* first reschedule or stop timer */	1177	/* first reschedule or stop timer */
297	if (w->repeat)	1178	if (w->repeat)
298	{	1179	{
299	if (w->is_abs)	1180	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1181
301	else
302	w->at = now + w->repeat;	1182	((WT)w)->at += w->repeat;
		1183	if (((WT)w)->at < mn_now)
		1184	((WT)w)->at = mn_now;
303		1185
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	1186	downheap ((WT *)timers, timercnt, 0);
307	}	1187	}
308	else	1188	else
		1189	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1190
		1191	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1192	}
		1193	}
		1194
		1195	#if EV_PERIODIC_ENABLE
		1196	void inline_size
		1197	periodics_reify (EV_P)
		1198	{
		1199	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1200	{
		1201	ev_periodic *w = periodics [0];
		1202
		1203	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1204
		1205	/* first reschedule or stop timer */
		1206	if (w->reschedule_cb)
309	{	1207	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1208	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	1209	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1210	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1211	}
		1212	else if (w->interval)
		1213	{
		1214	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1215	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1216	downheap ((WT *)periodics, periodiccnt, 0);
		1217	}
		1218	else
		1219	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1220
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1221	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1222	}
316	}	1223	}
317		1224
318	static void	1225	static void noinline
319	time_update ()	1226	periodics_reschedule (EV_P)
320	{	1227	{
321	int i;	1228	int i;
		1229
		1230	/* adjust periodics after time jump */
		1231	for (i = 0; i < periodiccnt; ++i)
		1232	{
		1233	ev_periodic *w = periodics [i];
		1234
		1235	if (w->reschedule_cb)
		1236	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1237	else if (w->interval)
		1238	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1239	}
		1240
		1241	/* now rebuild the heap */
		1242	for (i = periodiccnt >> 1; i--; )
		1243	downheap ((WT *)periodics, periodiccnt, i);
		1244	}
		1245	#endif
		1246
		1247	int inline_size
		1248	time_update_monotonic (EV_P)
		1249	{
		1250	mn_now = get_clock ();
		1251
		1252	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1253	{
		1254	ev_rt_now = rtmn_diff + mn_now;
		1255	return 0;
		1256	}
		1257	else
		1258	{
		1259	now_floor = mn_now;
322	ev_now = ev_time ();	1260	ev_rt_now = ev_time ();
323		1261	return 1;
324	if (have_monotonic)
325	{	1262	}
326	ev_tstamp odiff = diff;	1263	}
327		1264
328	/* detecting time jumps is much more difficult */	1265	void inline_size
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1266	time_update (EV_P)
		1267	{
		1268	int i;
		1269
		1270	#if EV_USE_MONOTONIC
		1271	if (expect_true (have_monotonic))
		1272	{
		1273	if (time_update_monotonic (EV_A))
330	{	1274	{
331	now = get_clock ();	1275	ev_tstamp odiff = rtmn_diff;
		1276
		1277	/* loop a few times, before making important decisions.
		1278	* on the choice of "4": one iteration isn't enough,
		1279	* in case we get preempted during the calls to
		1280	* ev_time and get_clock. a second call is almost guaranteed
		1281	* to succeed in that case, though. and looping a few more times
		1282	* doesn't hurt either as we only do this on time-jumps or
		1283	* in the unlikely event of having been preempted here.
		1284	*/
		1285	for (i = 4; --i; )
		1286	{
332	diff = ev_now - now;	1287	rtmn_diff = ev_rt_now - mn_now;
333		1288
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1289	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1290	return; /* all is well */
336		1291
337	ev_now = ev_time ();	1292	ev_rt_now = ev_time ();
		1293	mn_now = get_clock ();
		1294	now_floor = mn_now;
		1295	}
		1296
		1297	# if EV_PERIODIC_ENABLE
		1298	periodics_reschedule (EV_A);
		1299	# endif
		1300	/* no timer adjustment, as the monotonic clock doesn't jump */
		1301	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1302	}
		1303	}
		1304	else
		1305	#endif
		1306	{
		1307	ev_rt_now = ev_time ();
339		1308
340	/* time jump detected, reschedule atimers */	1309	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
341	for (i = 0; i < atimercnt; ++i)
342	{	1310	{
343	struct ev_timer *w = atimers [i];	1311	#if EV_PERIODIC_ENABLE
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1312	periodics_reschedule (EV_A);
		1313	#endif
		1314
		1315	/* adjust timers. this is easy, as the offset is the same for all of them */
		1316	for (i = 0; i < timercnt; ++i)
		1317	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1318	}
346	}
347	else
348	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* time jump detected, adjust rtimers */
351	for (i = 0; i < rtimercnt; ++i)
352	rtimers [i]->at += ev_now - now;
353		1319
354	now = ev_now;	1320	mn_now = ev_rt_now;
355	}	1321	}
356	}	1322	}
357		1323
358	int ev_loop_done;	1324	void
		1325	ev_ref (EV_P)
		1326	{
		1327	++activecnt;
		1328	}
359		1329
		1330	void
		1331	ev_unref (EV_P)
		1332	{
		1333	--activecnt;
		1334	}
		1335
		1336	static int loop_done;
		1337
		1338	void
360	void ev_loop (int flags)	1339	ev_loop (EV_P_ int flags)
361	{	1340	{
362	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1341	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1342	? EVUNLOOP_ONE
		1343	: EVUNLOOP_CANCEL;
		1344
		1345	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
364		1346
365	do	1347	do
366	{	1348	{
		1349	#ifndef _WIN32
		1350	if (expect_false (curpid)) /* penalise the forking check even more */
		1351	if (expect_false (getpid () != curpid))
		1352	{
		1353	curpid = getpid ();
		1354	postfork = 1;
		1355	}
		1356	#endif
		1357
		1358	#if EV_FORK_ENABLE
		1359	/* we might have forked, so queue fork handlers */
		1360	if (expect_false (postfork))
		1361	if (forkcnt)
		1362	{
		1363	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1364	call_pending (EV_A);
		1365	}
		1366	#endif
		1367
		1368	/* queue check watchers (and execute them) */
		1369	if (expect_false (preparecnt))
		1370	{
		1371	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1372	call_pending (EV_A);
		1373	}
		1374
		1375	if (expect_false (!activecnt))
		1376	break;
		1377
		1378	/* we might have forked, so reify kernel state if necessary */
		1379	if (expect_false (postfork))
		1380	loop_fork (EV_A);
		1381
367	/* update fd-related kernel structures */	1382	/* update fd-related kernel structures */
368	fd_reify ();	1383	fd_reify (EV_A);
369		1384
370	/* calculate blocking time */	1385	/* calculate blocking time */
371	if (flags & EVLOOP_NONBLOCK)	1386	{
372	block = 0.;	1387	ev_tstamp block;
		1388
		1389	if (expect_false (flags & EVLOOP_NONBLOCK || idlecnt || !activecnt))
		1390	block = 0.; /* do not block at all */
373	else	1391	else
374	{	1392	{
		1393	/* update time to cancel out callback processing overhead */
		1394	#if EV_USE_MONOTONIC
		1395	if (expect_true (have_monotonic))
		1396	time_update_monotonic (EV_A);
		1397	else
		1398	#endif
		1399	{
		1400	ev_rt_now = ev_time ();
		1401	mn_now = ev_rt_now;
		1402	}
		1403
375	block = MAX_BLOCKTIME;	1404	block = MAX_BLOCKTIME;
376		1405
377	if (rtimercnt)	1406	if (timercnt)
378	{	1407	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1408	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1409	if (block > to) block = to;
381	}	1410	}
382		1411
		1412	#if EV_PERIODIC_ENABLE
383	if (atimercnt)	1413	if (periodiccnt)
384	{	1414	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1415	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1416	if (block > to) block = to;
387	}	1417	}
		1418	#endif
388		1419
389	if (block < 0.) block = 0.;	1420	if (expect_false (block < 0.)) block = 0.;
390	}	1421	}
391		1422
392	method_poll (block);	1423	backend_poll (EV_A_ block);
		1424	}
393		1425
394	/* update ev_now, do magic */	1426	/* update ev_rt_now, do magic */
395	time_update ();	1427	time_update (EV_A);
396		1428
397	/* put pending timers into pendign queue and reschedule them */	1429	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1430	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1431	#if EV_PERIODIC_ENABLE
400	/* relative timers second */	1432	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1433	#endif
402		1434
		1435	/* queue idle watchers unless other events are pending */
		1436	if (idlecnt && !any_pending (EV_A))
		1437	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1438
		1439	/* queue check watchers, to be executed first */
		1440	if (expect_false (checkcnt))
		1441	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1442
403	call_pending ();	1443	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1444
408	static void	1445	}
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1446	while (expect_true (activecnt && !loop_done));
		1447
		1448	if (loop_done == EVUNLOOP_ONE)
		1449	loop_done = EVUNLOOP_CANCEL;
		1450	}
		1451
		1452	void
		1453	ev_unloop (EV_P_ int how)
		1454	{
		1455	loop_done = how;
		1456	}
		1457
		1458	/*****************************************************************************/
		1459
		1460	void inline_size
		1461	wlist_add (WL *head, WL elem)
410	{	1462	{
411	elem->next = *head;	1463	elem->next = *head;
412	*head = elem;	1464	*head = elem;
413	}	1465	}
414		1466
415	static void	1467	void inline_size
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1468	wlist_del (WL *head, WL elem)
417	{	1469	{
418	while (*head)	1470	while (*head)
419	{	1471	{
420	if (*head == elem)	1472	if (*head == elem)
421	{	1473	{
…		…
425		1477
426	head = &(*head)->next;	1478	head = &(*head)->next;
427	}	1479	}
428	}	1480	}
429		1481
		1482	void inline_speed
		1483	ev_clear_pending (EV_P_ W w)
		1484	{
		1485	if (w->pending)
		1486	{
		1487	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1488	w->pending = 0;
		1489	}
		1490	}
		1491
		1492	void inline_speed
		1493	ev_start (EV_P_ W w, int active)
		1494	{
		1495	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1496	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1497
		1498	w->active = active;
		1499	ev_ref (EV_A);
		1500	}
		1501
		1502	void inline_size
		1503	ev_stop (EV_P_ W w)
		1504	{
		1505	ev_unref (EV_A);
		1506	w->active = 0;
		1507	}
		1508
		1509	/*****************************************************************************/
		1510
		1511	void
		1512	ev_io_start (EV_P_ ev_io *w)
		1513	{
		1514	int fd = w->fd;
		1515
		1516	if (expect_false (ev_is_active (w)))
		1517	return;
		1518
		1519	assert (("ev_io_start called with negative fd", fd >= 0));
		1520
		1521	ev_start (EV_A_ (W)w, 1);
		1522	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1523	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1524
		1525	fd_change (EV_A_ fd);
		1526	}
		1527
		1528	void
		1529	ev_io_stop (EV_P_ ev_io *w)
		1530	{
		1531	ev_clear_pending (EV_A_ (W)w);
		1532	if (expect_false (!ev_is_active (w)))
		1533	return;
		1534
		1535	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1536
		1537	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1538	ev_stop (EV_A_ (W)w);
		1539
		1540	fd_change (EV_A_ w->fd);
		1541	}
		1542
		1543	void
		1544	ev_timer_start (EV_P_ ev_timer *w)
		1545	{
		1546	if (expect_false (ev_is_active (w)))
		1547	return;
		1548
		1549	((WT)w)->at += mn_now;
		1550
		1551	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1552
		1553	ev_start (EV_A_ (W)w, ++timercnt);
		1554	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1555	timers [timercnt - 1] = w;
		1556	upheap ((WT *)timers, timercnt - 1);
		1557
		1558	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1559	}
		1560
		1561	void
		1562	ev_timer_stop (EV_P_ ev_timer *w)
		1563	{
		1564	ev_clear_pending (EV_A_ (W)w);
		1565	if (expect_false (!ev_is_active (w)))
		1566	return;
		1567
		1568	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1569
		1570	{
		1571	int active = ((W)w)->active;
		1572
		1573	if (expect_true (--active < --timercnt))
		1574	{
		1575	timers [active] = timers [timercnt];
		1576	adjustheap ((WT *)timers, timercnt, active);
		1577	}
		1578	}
		1579
		1580	((WT)w)->at -= mn_now;
		1581
		1582	ev_stop (EV_A_ (W)w);
		1583	}
		1584
		1585	void
		1586	ev_timer_again (EV_P_ ev_timer *w)
		1587	{
		1588	if (ev_is_active (w))
		1589	{
		1590	if (w->repeat)
		1591	{
		1592	((WT)w)->at = mn_now + w->repeat;
		1593	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1594	}
		1595	else
		1596	ev_timer_stop (EV_A_ w);
		1597	}
		1598	else if (w->repeat)
		1599	{
		1600	w->at = w->repeat;
		1601	ev_timer_start (EV_A_ w);
		1602	}
		1603	}
		1604
		1605	#if EV_PERIODIC_ENABLE
		1606	void
		1607	ev_periodic_start (EV_P_ ev_periodic *w)
		1608	{
		1609	if (expect_false (ev_is_active (w)))
		1610	return;
		1611
		1612	if (w->reschedule_cb)
		1613	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1614	else if (w->interval)
		1615	{
		1616	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1617	/* this formula differs from the one in periodic_reify because we do not always round up */
		1618	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1619	}
		1620
		1621	ev_start (EV_A_ (W)w, ++periodiccnt);
		1622	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1623	periodics [periodiccnt - 1] = w;
		1624	upheap ((WT *)periodics, periodiccnt - 1);
		1625
		1626	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1627	}
		1628
		1629	void
		1630	ev_periodic_stop (EV_P_ ev_periodic *w)
		1631	{
		1632	ev_clear_pending (EV_A_ (W)w);
		1633	if (expect_false (!ev_is_active (w)))
		1634	return;
		1635
		1636	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1637
		1638	{
		1639	int active = ((W)w)->active;
		1640
		1641	if (expect_true (--active < --periodiccnt))
		1642	{
		1643	periodics [active] = periodics [periodiccnt];
		1644	adjustheap ((WT *)periodics, periodiccnt, active);
		1645	}
		1646	}
		1647
		1648	ev_stop (EV_A_ (W)w);
		1649	}
		1650
		1651	void
		1652	ev_periodic_again (EV_P_ ev_periodic *w)
		1653	{
		1654	/* TODO: use adjustheap and recalculation */
		1655	ev_periodic_stop (EV_A_ w);
		1656	ev_periodic_start (EV_A_ w);
		1657	}
		1658	#endif
		1659
		1660	#ifndef SA_RESTART
		1661	# define SA_RESTART 0
		1662	#endif
		1663
		1664	void
		1665	ev_signal_start (EV_P_ ev_signal *w)
		1666	{
		1667	#if EV_MULTIPLICITY
		1668	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1669	#endif
		1670	if (expect_false (ev_is_active (w)))
		1671	return;
		1672
		1673	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1674
		1675	ev_start (EV_A_ (W)w, 1);
		1676	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1677	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1678
		1679	if (!((WL)w)->next)
		1680	{
		1681	#if _WIN32
		1682	signal (w->signum, sighandler);
		1683	#else
		1684	struct sigaction sa;
		1685	sa.sa_handler = sighandler;
		1686	sigfillset (&sa.sa_mask);
		1687	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1688	sigaction (w->signum, &sa, 0);
		1689	#endif
		1690	}
		1691	}
		1692
		1693	void
		1694	ev_signal_stop (EV_P_ ev_signal *w)
		1695	{
		1696	ev_clear_pending (EV_A_ (W)w);
		1697	if (expect_false (!ev_is_active (w)))
		1698	return;
		1699
		1700	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1701	ev_stop (EV_A_ (W)w);
		1702
		1703	if (!signals [w->signum - 1].head)
		1704	signal (w->signum, SIG_DFL);
		1705	}
		1706
		1707	void
		1708	ev_child_start (EV_P_ ev_child *w)
		1709	{
		1710	#if EV_MULTIPLICITY
		1711	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1712	#endif
		1713	if (expect_false (ev_is_active (w)))
		1714	return;
		1715
		1716	ev_start (EV_A_ (W)w, 1);
		1717	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1718	}
		1719
		1720	void
		1721	ev_child_stop (EV_P_ ev_child *w)
		1722	{
		1723	ev_clear_pending (EV_A_ (W)w);
		1724	if (expect_false (!ev_is_active (w)))
		1725	return;
		1726
		1727	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1728	ev_stop (EV_A_ (W)w);
		1729	}
		1730
		1731	#if EV_STAT_ENABLE
		1732
		1733	# ifdef _WIN32
		1734	# undef lstat
		1735	# define lstat(a,b) _stati64 (a,b)
		1736	# endif
		1737
		1738	#define DEF_STAT_INTERVAL 5.0074891
		1739	#define MIN_STAT_INTERVAL 0.1074891
		1740
		1741	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1742
		1743	#if EV_USE_INOTIFY
		1744	# define EV_INOTIFY_BUFSIZE 8192
		1745
		1746	static void noinline
		1747	infy_add (EV_P_ ev_stat *w)
		1748	{
		1749	w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
		1750
		1751	if (w->wd < 0)
		1752	{
		1753	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1754
		1755	/* monitor some parent directory for speedup hints */
		1756	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1757	{
		1758	char path [4096];
		1759	strcpy (path, w->path);
		1760
		1761	do
		1762	{
		1763	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1764	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1765
		1766	char *pend = strrchr (path, '/');
		1767
		1768	if (!pend)
		1769	break; /* whoops, no '/', complain to your admin */
		1770
		1771	*pend = 0;
		1772	w->wd = inotify_add_watch (fs_fd, path, mask);
		1773	}
		1774	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1775	}
		1776	}
		1777	else
		1778	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1779
		1780	if (w->wd >= 0)
		1781	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1782	}
		1783
		1784	static void noinline
		1785	infy_del (EV_P_ ev_stat *w)
		1786	{
		1787	int slot;
		1788	int wd = w->wd;
		1789
		1790	if (wd < 0)
		1791	return;
		1792
		1793	w->wd = -2;
		1794	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1795	wlist_del (&fs_hash [slot].head, (WL)w);
		1796
		1797	/* remove this watcher, if others are watching it, they will rearm */
		1798	inotify_rm_watch (fs_fd, wd);
		1799	}
		1800
		1801	static void noinline
		1802	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1803	{
		1804	if (slot < 0)
		1805	/* overflow, need to check for all hahs slots */
		1806	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1807	infy_wd (EV_A_ slot, wd, ev);
		1808	else
		1809	{
		1810	WL w_;
		1811
		1812	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1813	{
		1814	ev_stat *w = (ev_stat *)w_;
		1815	w_ = w_->next; /* lets us remove this watcher and all before it */
		1816
		1817	if (w->wd == wd || wd == -1)
		1818	{
		1819	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1820	{
		1821	w->wd = -1;
		1822	infy_add (EV_A_ w); /* re-add, no matter what */
		1823	}
		1824
		1825	stat_timer_cb (EV_A_ &w->timer, 0);
		1826	}
		1827	}
		1828	}
		1829	}
		1830
430	static void	1831	static void
431	ev_start (struct ev_watcher *w, int active)	1832	infy_cb (EV_P_ ev_io *w, int revents)
432	{	1833	{
433	w->pending = 0;	1834	char buf [EV_INOTIFY_BUFSIZE];
434	w->active = active;	1835	struct inotify_event *ev = (struct inotify_event *)buf;
		1836	int ofs;
		1837	int len = read (fs_fd, buf, sizeof (buf));
		1838
		1839	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1840	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1841	}
		1842
		1843	void inline_size
		1844	infy_init (EV_P)
		1845	{
		1846	if (fs_fd != -2)
		1847	return;
		1848
		1849	fs_fd = inotify_init ();
		1850
		1851	if (fs_fd >= 0)
		1852	{
		1853	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1854	ev_set_priority (&fs_w, EV_MAXPRI);
		1855	ev_io_start (EV_A_ &fs_w);
		1856	}
		1857	}
		1858
		1859	void inline_size
		1860	infy_fork (EV_P)
		1861	{
		1862	int slot;
		1863
		1864	if (fs_fd < 0)
		1865	return;
		1866
		1867	close (fs_fd);
		1868	fs_fd = inotify_init ();
		1869
		1870	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1871	{
		1872	WL w_ = fs_hash [slot].head;
		1873	fs_hash [slot].head = 0;
		1874
		1875	while (w_)
		1876	{
		1877	ev_stat *w = (ev_stat *)w_;
		1878	w_ = w_->next; /* lets us add this watcher */
		1879
		1880	w->wd = -1;
		1881
		1882	if (fs_fd >= 0)
		1883	infy_add (EV_A_ w); /* re-add, no matter what */
		1884	else
		1885	ev_timer_start (EV_A_ &w->timer);
		1886	}
		1887
		1888	}
		1889	}
		1890
		1891	#endif
		1892
		1893	void
		1894	ev_stat_stat (EV_P_ ev_stat *w)
		1895	{
		1896	if (lstat (w->path, &w->attr) < 0)
		1897	w->attr.st_nlink = 0;
		1898	else if (!w->attr.st_nlink)
		1899	w->attr.st_nlink = 1;
		1900	}
		1901
		1902	static void noinline
		1903	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1904	{
		1905	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1906
		1907	/* we copy this here each the time so that */
		1908	/* prev has the old value when the callback gets invoked */
		1909	w->prev = w->attr;
		1910	ev_stat_stat (EV_A_ w);
		1911
		1912	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		1913	if (
		1914	w->prev.st_dev != w->attr.st_dev
		1915	|| w->prev.st_ino != w->attr.st_ino
		1916	|| w->prev.st_mode != w->attr.st_mode
		1917	|| w->prev.st_nlink != w->attr.st_nlink
		1918	|| w->prev.st_uid != w->attr.st_uid
		1919	|| w->prev.st_gid != w->attr.st_gid
		1920	|| w->prev.st_rdev != w->attr.st_rdev
		1921	|| w->prev.st_size != w->attr.st_size
		1922	|| w->prev.st_atime != w->attr.st_atime
		1923	|| w->prev.st_mtime != w->attr.st_mtime
		1924	|| w->prev.st_ctime != w->attr.st_ctime
		1925	) {
		1926	#if EV_USE_INOTIFY
		1927	infy_del (EV_A_ w);
		1928	infy_add (EV_A_ w);
		1929	ev_stat_stat (EV_A_ w); /* avoid race... */
		1930	#endif
		1931
		1932	ev_feed_event (EV_A_ w, EV_STAT);
		1933	}
		1934	}
		1935
		1936	void
		1937	ev_stat_start (EV_P_ ev_stat *w)
		1938	{
		1939	if (expect_false (ev_is_active (w)))
		1940	return;
		1941
		1942	/* since we use memcmp, we need to clear any padding data etc. */
		1943	memset (&w->prev, 0, sizeof (ev_statdata));
		1944	memset (&w->attr, 0, sizeof (ev_statdata));
		1945
		1946	ev_stat_stat (EV_A_ w);
		1947
		1948	if (w->interval < MIN_STAT_INTERVAL)
		1949	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		1950
		1951	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		1952	ev_set_priority (&w->timer, ev_priority (w));
		1953
		1954	#if EV_USE_INOTIFY
		1955	infy_init (EV_A);
		1956
		1957	if (fs_fd >= 0)
		1958	infy_add (EV_A_ w);
		1959	else
		1960	#endif
		1961	ev_timer_start (EV_A_ &w->timer);
		1962
		1963	ev_start (EV_A_ (W)w, 1);
		1964	}
		1965
		1966	void
		1967	ev_stat_stop (EV_P_ ev_stat *w)
		1968	{
		1969	ev_clear_pending (EV_A_ (W)w);
		1970	if (expect_false (!ev_is_active (w)))
		1971	return;
		1972
		1973	#if EV_USE_INOTIFY
		1974	infy_del (EV_A_ w);
		1975	#endif
		1976	ev_timer_stop (EV_A_ &w->timer);
		1977
		1978	ev_stop (EV_A_ (W)w);
		1979	}
		1980	#endif
		1981
		1982	void
		1983	ev_idle_start (EV_P_ ev_idle *w)
		1984	{
		1985	if (expect_false (ev_is_active (w)))
		1986	return;
		1987
		1988	ev_start (EV_A_ (W)w, ++idlecnt);
		1989	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1990	idles [idlecnt - 1] = w;
		1991	}
		1992
		1993	void
		1994	ev_idle_stop (EV_P_ ev_idle *w)
		1995	{
		1996	ev_clear_pending (EV_A_ (W)w);
		1997	if (expect_false (!ev_is_active (w)))
		1998	return;
		1999
		2000	{
		2001	int active = ((W)w)->active;
		2002	idles [active - 1] = idles [--idlecnt];
		2003	((W)idles [active - 1])->active = active;
		2004	}
		2005
		2006	ev_stop (EV_A_ (W)w);
		2007	}
		2008
		2009	void
		2010	ev_prepare_start (EV_P_ ev_prepare *w)
		2011	{
		2012	if (expect_false (ev_is_active (w)))
		2013	return;
		2014
		2015	ev_start (EV_A_ (W)w, ++preparecnt);
		2016	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2017	prepares [preparecnt - 1] = w;
		2018	}
		2019
		2020	void
		2021	ev_prepare_stop (EV_P_ ev_prepare *w)
		2022	{
		2023	ev_clear_pending (EV_A_ (W)w);
		2024	if (expect_false (!ev_is_active (w)))
		2025	return;
		2026
		2027	{
		2028	int active = ((W)w)->active;
		2029	prepares [active - 1] = prepares [--preparecnt];
		2030	((W)prepares [active - 1])->active = active;
		2031	}
		2032
		2033	ev_stop (EV_A_ (W)w);
		2034	}
		2035
		2036	void
		2037	ev_check_start (EV_P_ ev_check *w)
		2038	{
		2039	if (expect_false (ev_is_active (w)))
		2040	return;
		2041
		2042	ev_start (EV_A_ (W)w, ++checkcnt);
		2043	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2044	checks [checkcnt - 1] = w;
		2045	}
		2046
		2047	void
		2048	ev_check_stop (EV_P_ ev_check *w)
		2049	{
		2050	ev_clear_pending (EV_A_ (W)w);
		2051	if (expect_false (!ev_is_active (w)))
		2052	return;
		2053
		2054	{
		2055	int active = ((W)w)->active;
		2056	checks [active - 1] = checks [--checkcnt];
		2057	((W)checks [active - 1])->active = active;
		2058	}
		2059
		2060	ev_stop (EV_A_ (W)w);
		2061	}
		2062
		2063	#if EV_EMBED_ENABLE
		2064	void noinline
		2065	ev_embed_sweep (EV_P_ ev_embed *w)
		2066	{
		2067	ev_loop (w->loop, EVLOOP_NONBLOCK);
435	}	2068	}
436		2069
437	static void	2070	static void
438	ev_stop (struct ev_watcher *w)	2071	embed_cb (EV_P_ ev_io *io, int revents)
439	{	2072	{
440	if (w->pending)	2073	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
441	pendings [w->pending - 1].w = 0;
442		2074
443	w->active = 0;
444	/* nop */
445	}
446
447	void
448	evio_start (struct ev_io *w)
449	{
450	if (ev_is_active (w))	2075	if (ev_cb (w))
451	return;	2076	ev_feed_event (EV_A_ (W)w, EV_EMBED);
452
453	int fd = w->fd;
454
455	ev_start ((struct ev_watcher *)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
458
459	++fdchangecnt;
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}
463
464	void
465	evio_stop (struct ev_io *w)
466	{
467	if (!ev_is_active (w))
468	return;
469
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
471	ev_stop ((struct ev_watcher *)w);
472
473	++fdchangecnt;
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}
477
478	void
479	evtimer_start (struct ev_timer *w)
480	{
481	if (ev_is_active (w))
482	return;
483
484	if (w->is_abs)
485	{
486	/* this formula differs from the one in timer_reify becuse we do not round up */
487	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
489
490	ev_start ((struct ev_watcher *)w, ++atimercnt);
491	array_needsize (atimers, atimermax, atimercnt, );
492	atimers [atimercnt - 1] = w;
493	upheap (atimers, atimercnt - 1);
494	}
495	else	2077	else
		2078	ev_embed_sweep (loop, w);
		2079	}
		2080
		2081	void
		2082	ev_embed_start (EV_P_ ev_embed *w)
		2083	{
		2084	if (expect_false (ev_is_active (w)))
		2085	return;
		2086
496	{	2087	{
497	w->at += now;	2088	struct ev_loop *loop = w->loop;
498		2089	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	2090	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
500	array_needsize (rtimers, rtimermax, rtimercnt, );
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}	2091	}
504		2092
505	}	2093	ev_set_priority (&w->io, ev_priority (w));
		2094	ev_io_start (EV_A_ &w->io);
506		2095
		2096	ev_start (EV_A_ (W)w, 1);
		2097	}
		2098
507	void	2099	void
508	evtimer_stop (struct ev_timer *w)	2100	ev_embed_stop (EV_P_ ev_embed *w)
509	{	2101	{
		2102	ev_clear_pending (EV_A_ (W)w);
510	if (!ev_is_active (w))	2103	if (expect_false (!ev_is_active (w)))
511	return;	2104	return;
512		2105
513	if (w->is_abs)	2106	ev_io_stop (EV_A_ &w->io);
514	{
515	if (w->active < atimercnt--)
516	{
517	atimers [w->active - 1] = atimers [atimercnt];
518	downheap (atimers, atimercnt, w->active - 1);
519	}
520	}
521	else
522	{
523	if (w->active < rtimercnt--)
524	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];
526	downheap (rtimers, rtimercnt, w->active - 1);
527	}
528	}
529		2107
530	ev_stop ((struct ev_watcher *)w);	2108	ev_stop (EV_A_ (W)w);
531	}	2109	}
		2110	#endif
532		2111
		2112	#if EV_FORK_ENABLE
533	void	2113	void
534	evsignal_start (struct ev_signal *w)	2114	ev_fork_start (EV_P_ ev_fork *w)
535	{	2115	{
536	if (ev_is_active (w))	2116	if (expect_false (ev_is_active (w)))
537	return;	2117	return;
538		2118
539	ev_start ((struct ev_watcher *)w, 1);	2119	ev_start (EV_A_ (W)w, ++forkcnt);
540	array_needsize (signals, signalmax, w->signum, signals_init);	2120	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2121	forks [forkcnt - 1] = w;
542	}	2122	}
543		2123
544	void	2124	void
545	evsignal_stop (struct ev_signal *w)	2125	ev_fork_stop (EV_P_ ev_fork *w)
546	{	2126	{
		2127	ev_clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	2128	if (expect_false (!ev_is_active (w)))
548	return;	2129	return;
549		2130
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2131	{
551	ev_stop ((struct ev_watcher *)w);	2132	int active = ((W)w)->active;
		2133	forks [active - 1] = forks [--forkcnt];
		2134	((W)forks [active - 1])->active = active;
		2135	}
		2136
		2137	ev_stop (EV_A_ (W)w);
552	}	2138	}
		2139	#endif
553		2140
554	/*****************************************************************************/	2141	/*****************************************************************************/
555	#if 1	2142
		2143	struct ev_once
		2144	{
		2145	ev_io io;
		2146	ev_timer to;
		2147	void (*cb)(int revents, void *arg);
		2148	void *arg;
		2149	};
556		2150
557	static void	2151	static void
558	sin_cb (struct ev_io *w, int revents)	2152	once_cb (EV_P_ struct ev_once *once, int revents)
559	{	2153	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2154	void (*cb)(int revents, void *arg) = once->cb;
		2155	void *arg = once->arg;
		2156
		2157	ev_io_stop (EV_A_ &once->io);
		2158	ev_timer_stop (EV_A_ &once->to);
		2159	ev_free (once);
		2160
		2161	cb (revents, arg);
561	}	2162	}
562		2163
563	static void	2164	static void
		2165	once_cb_io (EV_P_ ev_io *w, int revents)
		2166	{
		2167	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2168	}
		2169
		2170	static void
564	ocb (struct ev_timer *w, int revents)	2171	once_cb_to (EV_P_ ev_timer *w, int revents)
565	{	2172	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2173	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}	2174	}
570		2175
571	int main (void)	2176	void
		2177	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
572	{	2178	{
573	struct ev_io sin;	2179	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
574		2180
575	ev_init (0);	2181	if (expect_false (!once))
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}	2182	{
594	#endif	2183	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
595
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;	2184	return;
604	}	2185	}
605		2186
606	#endif	2187	once->cb = cb;
		2188	once->arg = arg;
607		2189
		2190	ev_init (&once->io, once_cb_io);
		2191	if (fd >= 0)
		2192	{
		2193	ev_io_set (&once->io, fd, events);
		2194	ev_io_start (EV_A_ &once->io);
		2195	}
608		2196
		2197	ev_init (&once->to, once_cb_to);
		2198	if (timeout >= 0.)
		2199	{
		2200	ev_timer_set (&once->to, timeout, 0.);
		2201	ev_timer_start (EV_A_ &once->to);
		2202	}
		2203	}
609		2204
		2205	#ifdef __cplusplus
		2206	}
		2207	#endif
610		2208

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