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Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.176 by root, Tue Dec 11 04:31:55 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
		202	#ifndef CLOCK_REALTIME
		203	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	204	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	205	#endif
17	#define HAVE_SELECT 1	206
		207	#if EV_SELECT_IS_WINSOCKET
		208	# include <winsock.h>
		209	#endif
		210
		211	#if !EV_STAT_ENABLE
		212	# define EV_USE_INOTIFY 0
		213	#endif
		214
		215	#if EV_USE_INOTIFY
		216	# include <sys/inotify.h>
		217	#endif
		218
		219	/**/
		220
		221	/*
		222	* This is used to avoid floating point rounding problems.
		223	* It is added to ev_rt_now when scheduling periodics
		224	* to ensure progress, time-wise, even when rounding
		225	* errors are against us.
		226	* This value is good at least till the year 4000
		227	* and intervals up to 20 years.
		228	* Better solutions welcome.
		229	*/
		230	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18		231
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	232	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	233	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		234	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21		235
		236	#if __GNUC__ >= 3
		237	# define expect(expr,value) __builtin_expect ((expr),(value))
		238	# define noinline __attribute__ ((noinline))
		239	#else
		240	# define expect(expr,value) (expr)
		241	# define noinline
		242	# if __STDC_VERSION__ < 199901L
		243	# define inline
		244	# endif
		245	#endif
		246
		247	#define expect_false(expr) expect ((expr) != 0, 0)
		248	#define expect_true(expr) expect ((expr) != 0, 1)
		249	#define inline_size static inline
		250
		251	#if EV_MINIMAL
		252	# define inline_speed static noinline
		253	#else
		254	# define inline_speed static inline
		255	#endif
		256
		257	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		258	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		259
		260	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		261	#define EMPTY2(a,b) /* used to suppress some warnings */
		262
		263	typedef ev_watcher *W;
		264	typedef ev_watcher_list *WL;
		265	typedef ev_watcher_time *WT;
		266
		267	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		268
		269	#ifdef _WIN32
		270	# include "ev_win32.c"
		271	#endif
		272
		273	/*****************************************************************************/
		274
		275	static void (*syserr_cb)(const char *msg);
		276
		277	void
		278	ev_set_syserr_cb (void (*cb)(const char *msg))
		279	{
		280	syserr_cb = cb;
		281	}
		282
		283	static void noinline
		284	syserr (const char *msg)
		285	{
		286	if (!msg)
		287	msg = "(libev) system error";
		288
		289	if (syserr_cb)
		290	syserr_cb (msg);
		291	else
		292	{
		293	perror (msg);
		294	abort ();
		295	}
		296	}
		297
		298	static void *(*alloc)(void *ptr, long size);
		299
		300	void
		301	ev_set_allocator (void *(*cb)(void *ptr, long size))
		302	{
		303	alloc = cb;
		304	}
		305
		306	inline_speed void *
		307	ev_realloc (void *ptr, long size)
		308	{
		309	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		310
		311	if (!ptr && size)
		312	{
		313	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		314	abort ();
		315	}
		316
		317	return ptr;
		318	}
		319
		320	#define ev_malloc(size) ev_realloc (0, (size))
		321	#define ev_free(ptr) ev_realloc ((ptr), 0)
		322
		323	/*****************************************************************************/
		324
		325	typedef struct
		326	{
		327	WL head;
		328	unsigned char events;
		329	unsigned char reify;
		330	#if EV_SELECT_IS_WINSOCKET
		331	SOCKET handle;
		332	#endif
		333	} ANFD;
		334
		335	typedef struct
		336	{
		337	W w;
		338	int events;
		339	} ANPENDING;
		340
		341	#if EV_USE_INOTIFY
		342	typedef struct
		343	{
		344	WL head;
		345	} ANFS;
		346	#endif
		347
		348	#if EV_MULTIPLICITY
		349
		350	struct ev_loop
		351	{
		352	ev_tstamp ev_rt_now;
		353	#define ev_rt_now ((loop)->ev_rt_now)
		354	#define VAR(name,decl) decl;
		355	#include "ev_vars.h"
		356	#undef VAR
		357	};
22	#include "ev.h"	358	#include "ev_wrap.h"
23		359
24	struct ev_watcher {	360	static struct ev_loop default_loop_struct;
25	EV_WATCHER (ev_watcher);	361	struct ev_loop *ev_default_loop_ptr;
26	};
27		362
28	struct ev_watcher_list {	363	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		364
32	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	365	ev_tstamp ev_rt_now;
34	int ev_method;	366	#define VAR(name,decl) static decl;
		367	#include "ev_vars.h"
		368	#undef VAR
35		369
36	static int have_monotonic; /* runtime */	370	static int ev_default_loop_ptr;
37		371
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	372	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	373
40	static void (*method_poll)(ev_tstamp timeout);	374	/*****************************************************************************/
41		375
42	ev_tstamp	376	ev_tstamp
43	ev_time (void)	377	ev_time (void)
44	{	378	{
45	#if HAVE_REALTIME	379	#if EV_USE_REALTIME
46	struct timespec ts;	380	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	381	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	382	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	383	#else
50	struct timeval tv;	384	struct timeval tv;
51	gettimeofday (&tv, 0);	385	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	386	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	387	#endif
54	}	388	}
55		389
56	static ev_tstamp	390	ev_tstamp inline_size
57	get_clock (void)	391	get_clock (void)
58	{	392	{
59	#if HAVE_MONOTONIC	393	#if EV_USE_MONOTONIC
60	if (have_monotonic)	394	if (expect_true (have_monotonic))
61	{	395	{
62	struct timespec ts;	396	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	397	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	398	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	399	}
66	#endif	400	#endif
67		401
68	return ev_time ();	402	return ev_time ();
69	}	403	}
70		404
		405	#if EV_MULTIPLICITY
		406	ev_tstamp
		407	ev_now (EV_P)
		408	{
		409	return ev_rt_now;
		410	}
		411	#endif
		412
		413	int inline_size
		414	array_nextsize (int elem, int cur, int cnt)
		415	{
		416	int ncur = cur + 1;
		417
		418	do
		419	ncur <<= 1;
		420	while (cnt > ncur);
		421
		422	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		423	if (elem * ncur > 4096)
		424	{
		425	ncur *= elem;
		426	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		427	ncur = ncur - sizeof (void *) * 4;
		428	ncur /= elem;
		429	}
		430
		431	return ncur;
		432	}
		433
		434	static noinline void *
		435	array_realloc (int elem, void *base, int *cur, int cnt)
		436	{
		437	*cur = array_nextsize (elem, *cur, cnt);
		438	return ev_realloc (base, elem * *cur);
		439	}
		440
71	#define array_needsize(base,cur,cnt,init) \	441	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	442	if (expect_false ((cnt) > (cur))) \
73	{ \	443	{ \
74	int newcnt = cur ? cur << 1 : 16; \	444	int ocur_ = (cur); \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	445	(base) = (type *)array_realloc \
76	base = realloc (base, sizeof (*base) * (newcnt)); \	446	(sizeof (type), (base), &(cur), (cnt)); \
77	init (base + cur, newcnt - cur); \	447	init ((base) + (ocur_), (cur) - ocur_); \
78	cur = newcnt; \	448	}
		449
		450	#if 0
		451	#define array_slim(type,stem) \
		452	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		453	{ \
		454	stem ## max = array_roundsize (stem ## cnt >> 1); \
		455	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		456	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		457	}
		458	#endif
		459
		460	#define array_free(stem, idx) \
		461	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		462
		463	/*****************************************************************************/
		464
		465	void noinline
		466	ev_feed_event (EV_P_ void *w, int revents)
		467	{
		468	W w_ = (W)w;
		469	int pri = ABSPRI (w_);
		470
		471	if (expect_false (w_->pending))
		472	pendings [pri][w_->pending - 1].events |= revents;
		473	else
79	}	474	{
		475	w_->pending = ++pendingcnt [pri];
		476	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		477	pendings [pri][w_->pending - 1].w = w_;
		478	pendings [pri][w_->pending - 1].events = revents;
		479	}
		480	}
80		481
81	typedef struct	482	void inline_size
		483	queue_events (EV_P_ W *events, int eventcnt, int type)
82	{	484	{
83	struct ev_io *head;	485	int i;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86		486
87	static ANFD *anfds;	487	for (i = 0; i < eventcnt; ++i)
88	static int anfdmax;	488	ev_feed_event (EV_A_ events [i], type);
		489	}
89		490
90	static int *fdchanges;	491	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		492
93	static void	493	void inline_size
94	anfds_init (ANFD *base, int count)	494	anfds_init (ANFD *base, int count)
95	{	495	{
96	while (count--)	496	while (count--)
97	{	497	{
98	base->head = 0;	498	base->head = 0;
99	base->wev = base->rev = EV_NONE;	499	base->events = EV_NONE;
		500	base->reify = 0;
		501
100	++base;	502	++base;
101	}	503	}
102	}	504	}
103		505
104	typedef struct	506	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)	507	fd_event (EV_P_ int fd, int revents)
124	{	508	{
125	ANFD *anfd = anfds + fd;	509	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	510	ev_io *w;
127		511
128	for (w = anfd->head; w; w = w->next)	512	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129	{	513	{
130	int ev = w->events & events;	514	int ev = w->events & revents;
131		515
132	if (ev)	516	if (ev)
133	event ((struct ev_watcher *)w, ev);	517	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	{	518	}
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	}	519	}
159		520
160	static void	521	void
161	downheap (struct ev_timer **timers, int N, int k)	522	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	523	{
163	struct ev_timer *w = timers [k];	524	if (fd >= 0 && fd < anfdmax)
164		525	fd_event (EV_A_ fd, revents);
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	}	526	}
183		527
184	static struct ev_signal **signals;	528	void inline_size
185	static int signalmax;	529	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	{	530	{
247	int i;	531	int i;
248		532
249	for (i = 0; i < fdchangecnt; ++i)	533	for (i = 0; i < fdchangecnt; ++i)
250	{	534	{
251	int fd = fdchanges [i];	535	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	536	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	537	ev_io *w;
254		538
255	int wev = 0;	539	int events = 0;
256		540
257	for (w = anfd->head; w; w = w->next)	541	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
258	wev |= w->events;	542	events |= w->events;
259		543
260	if (anfd->wev != wev)	544	#if EV_SELECT_IS_WINSOCKET
		545	if (events)
261	{	546	{
262	method_modify (fd, anfd->wev, wev);	547	unsigned long argp;
263	anfd->wev = wev;	548	anfd->handle = _get_osfhandle (fd);
		549	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	550	}
		551	#endif
		552
		553	anfd->reify = 0;
		554
		555	backend_modify (EV_A_ fd, anfd->events, events);
		556	anfd->events = events;
265	}	557	}
266		558
267	fdchangecnt = 0;	559	fdchangecnt = 0;
268	}	560	}
269		561
		562	void inline_size
		563	fd_change (EV_P_ int fd)
		564	{
		565	if (expect_false (anfds [fd].reify))
		566	return;
		567
		568	anfds [fd].reify = 1;
		569
		570	++fdchangecnt;
		571	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		572	fdchanges [fdchangecnt - 1] = fd;
		573	}
		574
		575	void inline_speed
		576	fd_kill (EV_P_ int fd)
		577	{
		578	ev_io *w;
		579
		580	while ((w = (ev_io *)anfds [fd].head))
		581	{
		582	ev_io_stop (EV_A_ w);
		583	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		584	}
		585	}
		586
		587	int inline_size
		588	fd_valid (int fd)
		589	{
		590	#ifdef _WIN32
		591	return _get_osfhandle (fd) != -1;
		592	#else
		593	return fcntl (fd, F_GETFD) != -1;
		594	#endif
		595	}
		596
		597	/* called on EBADF to verify fds */
		598	static void noinline
		599	fd_ebadf (EV_P)
		600	{
		601	int fd;
		602
		603	for (fd = 0; fd < anfdmax; ++fd)
		604	if (anfds [fd].events)
		605	if (!fd_valid (fd) == -1 && errno == EBADF)
		606	fd_kill (EV_A_ fd);
		607	}
		608
		609	/* called on ENOMEM in select/poll to kill some fds and retry */
		610	static void noinline
		611	fd_enomem (EV_P)
		612	{
		613	int fd;
		614
		615	for (fd = anfdmax; fd--; )
		616	if (anfds [fd].events)
		617	{
		618	fd_kill (EV_A_ fd);
		619	return;
		620	}
		621	}
		622
		623	/* usually called after fork if backend needs to re-arm all fds from scratch */
		624	static void noinline
		625	fd_rearm_all (EV_P)
		626	{
		627	int fd;
		628
		629	for (fd = 0; fd < anfdmax; ++fd)
		630	if (anfds [fd].events)
		631	{
		632	anfds [fd].events = 0;
		633	fd_change (EV_A_ fd);
		634	}
		635	}
		636
		637	/*****************************************************************************/
		638
		639	void inline_speed
		640	upheap (WT *heap, int k)
		641	{
		642	WT w = heap [k];
		643
		644	while (k && heap [k >> 1]->at > w->at)
		645	{
		646	heap [k] = heap [k >> 1];
		647	((W)heap [k])->active = k + 1;
		648	k >>= 1;
		649	}
		650
		651	heap [k] = w;
		652	((W)heap [k])->active = k + 1;
		653
		654	}
		655
		656	void inline_speed
		657	downheap (WT *heap, int N, int k)
		658	{
		659	WT w = heap [k];
		660
		661	while (k < (N >> 1))
		662	{
		663	int j = k << 1;
		664
		665	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		666	++j;
		667
		668	if (w->at <= heap [j]->at)
		669	break;
		670
		671	heap [k] = heap [j];
		672	((W)heap [k])->active = k + 1;
		673	k = j;
		674	}
		675
		676	heap [k] = w;
		677	((W)heap [k])->active = k + 1;
		678	}
		679
		680	void inline_size
		681	adjustheap (WT *heap, int N, int k)
		682	{
		683	upheap (heap, k);
		684	downheap (heap, N, k);
		685	}
		686
		687	/*****************************************************************************/
		688
		689	typedef struct
		690	{
		691	WL head;
		692	sig_atomic_t volatile gotsig;
		693	} ANSIG;
		694
		695	static ANSIG *signals;
		696	static int signalmax;
		697
		698	static int sigpipe [2];
		699	static sig_atomic_t volatile gotsig;
		700	static ev_io sigev;
		701
		702	void inline_size
		703	signals_init (ANSIG *base, int count)
		704	{
		705	while (count--)
		706	{
		707	base->head = 0;
		708	base->gotsig = 0;
		709
		710	++base;
		711	}
		712	}
		713
270	static void	714	static void
271	call_pending ()	715	sighandler (int signum)
		716	{
		717	#if _WIN32
		718	signal (signum, sighandler);
		719	#endif
		720
		721	signals [signum - 1].gotsig = 1;
		722
		723	if (!gotsig)
		724	{
		725	int old_errno = errno;
		726	gotsig = 1;
		727	write (sigpipe [1], &signum, 1);
		728	errno = old_errno;
		729	}
		730	}
		731
		732	void noinline
		733	ev_feed_signal_event (EV_P_ int signum)
		734	{
		735	WL w;
		736
		737	#if EV_MULTIPLICITY
		738	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		739	#endif
		740
		741	--signum;
		742
		743	if (signum < 0 || signum >= signalmax)
		744	return;
		745
		746	signals [signum].gotsig = 0;
		747
		748	for (w = signals [signum].head; w; w = w->next)
		749	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		750	}
		751
		752	static void
		753	sigcb (EV_P_ ev_io *iow, int revents)
		754	{
		755	int signum;
		756
		757	read (sigpipe [0], &revents, 1);
		758	gotsig = 0;
		759
		760	for (signum = signalmax; signum--; )
		761	if (signals [signum].gotsig)
		762	ev_feed_signal_event (EV_A_ signum + 1);
		763	}
		764
		765	void inline_speed
		766	fd_intern (int fd)
		767	{
		768	#ifdef _WIN32
		769	int arg = 1;
		770	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		771	#else
		772	fcntl (fd, F_SETFD, FD_CLOEXEC);
		773	fcntl (fd, F_SETFL, O_NONBLOCK);
		774	#endif
		775	}
		776
		777	static void noinline
		778	siginit (EV_P)
		779	{
		780	fd_intern (sigpipe [0]);
		781	fd_intern (sigpipe [1]);
		782
		783	ev_io_set (&sigev, sigpipe [0], EV_READ);
		784	ev_io_start (EV_A_ &sigev);
		785	ev_unref (EV_A); /* child watcher should not keep loop alive */
		786	}
		787
		788	/*****************************************************************************/
		789
		790	static ev_child *childs [EV_PID_HASHSIZE];
		791
		792	#ifndef _WIN32
		793
		794	static ev_signal childev;
		795
		796	void inline_speed
		797	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		798	{
		799	ev_child *w;
		800
		801	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		802	if (w->pid == pid || !w->pid)
		803	{
		804	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
		805	w->rpid = pid;
		806	w->rstatus = status;
		807	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		808	}
		809	}
		810
		811	#ifndef WCONTINUED
		812	# define WCONTINUED 0
		813	#endif
		814
		815	static void
		816	childcb (EV_P_ ev_signal *sw, int revents)
		817	{
		818	int pid, status;
		819
		820	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
		821	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		822	if (!WCONTINUED
		823	|| errno != EINVAL
		824	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		825	return;
		826
		827	/* make sure we are called again until all childs have been reaped */
		828	/* we need to do it this way so that the callback gets called before we continue */
		829	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		830
		831	child_reap (EV_A_ sw, pid, pid, status);
		832	if (EV_PID_HASHSIZE > 1)
		833	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		834	}
		835
		836	#endif
		837
		838	/*****************************************************************************/
		839
		840	#if EV_USE_PORT
		841	# include "ev_port.c"
		842	#endif
		843	#if EV_USE_KQUEUE
		844	# include "ev_kqueue.c"
		845	#endif
		846	#if EV_USE_EPOLL
		847	# include "ev_epoll.c"
		848	#endif
		849	#if EV_USE_POLL
		850	# include "ev_poll.c"
		851	#endif
		852	#if EV_USE_SELECT
		853	# include "ev_select.c"
		854	#endif
		855
		856	int
		857	ev_version_major (void)
		858	{
		859	return EV_VERSION_MAJOR;
		860	}
		861
		862	int
		863	ev_version_minor (void)
		864	{
		865	return EV_VERSION_MINOR;
		866	}
		867
		868	/* return true if we are running with elevated privileges and should ignore env variables */
		869	int inline_size
		870	enable_secure (void)
		871	{
		872	#ifdef _WIN32
		873	return 0;
		874	#else
		875	return getuid () != geteuid ()
		876	|| getgid () != getegid ();
		877	#endif
		878	}
		879
		880	unsigned int
		881	ev_supported_backends (void)
		882	{
		883	unsigned int flags = 0;
		884
		885	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		886	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		887	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		888	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		889	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		890
		891	return flags;
		892	}
		893
		894	unsigned int
		895	ev_recommended_backends (void)
		896	{
		897	unsigned int flags = ev_supported_backends ();
		898
		899	#ifndef __NetBSD__
		900	/* kqueue is borked on everything but netbsd apparently */
		901	/* it usually doesn't work correctly on anything but sockets and pipes */
		902	flags &= ~EVBACKEND_KQUEUE;
		903	#endif
		904	#ifdef __APPLE__
		905	// flags &= ~EVBACKEND_KQUEUE; for documentation
		906	flags &= ~EVBACKEND_POLL;
		907	#endif
		908
		909	return flags;
		910	}
		911
		912	unsigned int
		913	ev_embeddable_backends (void)
		914	{
		915	return EVBACKEND_EPOLL
		916	| EVBACKEND_KQUEUE
		917	| EVBACKEND_PORT;
		918	}
		919
		920	unsigned int
		921	ev_backend (EV_P)
		922	{
		923	return backend;
		924	}
		925
		926	unsigned int
		927	ev_loop_count (EV_P)
		928	{
		929	return loop_count;
		930	}
		931
		932	static void noinline
		933	loop_init (EV_P_ unsigned int flags)
		934	{
		935	if (!backend)
		936	{
		937	#if EV_USE_MONOTONIC
		938	{
		939	struct timespec ts;
		940	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		941	have_monotonic = 1;
		942	}
		943	#endif
		944
		945	ev_rt_now = ev_time ();
		946	mn_now = get_clock ();
		947	now_floor = mn_now;
		948	rtmn_diff = ev_rt_now - mn_now;
		949
		950	/* pid check not overridable via env */
		951	#ifndef _WIN32
		952	if (flags & EVFLAG_FORKCHECK)
		953	curpid = getpid ();
		954	#endif
		955
		956	if (!(flags & EVFLAG_NOENV)
		957	&& !enable_secure ()
		958	&& getenv ("LIBEV_FLAGS"))
		959	flags = atoi (getenv ("LIBEV_FLAGS"));
		960
		961	if (!(flags & 0x0000ffffUL))
		962	flags |= ev_recommended_backends ();
		963
		964	backend = 0;
		965	backend_fd = -1;
		966	#if EV_USE_INOTIFY
		967	fs_fd = -2;
		968	#endif
		969
		970	#if EV_USE_PORT
		971	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		972	#endif
		973	#if EV_USE_KQUEUE
		974	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		975	#endif
		976	#if EV_USE_EPOLL
		977	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		978	#endif
		979	#if EV_USE_POLL
		980	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		981	#endif
		982	#if EV_USE_SELECT
		983	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		984	#endif
		985
		986	ev_init (&sigev, sigcb);
		987	ev_set_priority (&sigev, EV_MAXPRI);
		988	}
		989	}
		990
		991	static void noinline
		992	loop_destroy (EV_P)
272	{	993	{
273	int i;	994	int i;
274		995
275	for (i = 0; i < pendingcnt; ++i)	996	#if EV_USE_INOTIFY
		997	if (fs_fd >= 0)
		998	close (fs_fd);
		999	#endif
		1000
		1001	if (backend_fd >= 0)
		1002	close (backend_fd);
		1003
		1004	#if EV_USE_PORT
		1005	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1006	#endif
		1007	#if EV_USE_KQUEUE
		1008	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1009	#endif
		1010	#if EV_USE_EPOLL
		1011	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1012	#endif
		1013	#if EV_USE_POLL
		1014	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1015	#endif
		1016	#if EV_USE_SELECT
		1017	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1018	#endif
		1019
		1020	for (i = NUMPRI; i--; )
		1021	{
		1022	array_free (pending, [i]);
		1023	#if EV_IDLE_ENABLE
		1024	array_free (idle, [i]);
		1025	#endif
276	{	1026	}
277	ANPENDING *p = pendings + i;
278		1027
279	if (p->w)	1028	/* have to use the microsoft-never-gets-it-right macro */
		1029	array_free (fdchange, EMPTY);
		1030	array_free (timer, EMPTY);
		1031	#if EV_PERIODIC_ENABLE
		1032	array_free (periodic, EMPTY);
		1033	#endif
		1034	array_free (prepare, EMPTY);
		1035	array_free (check, EMPTY);
		1036
		1037	backend = 0;
		1038	}
		1039
		1040	void inline_size infy_fork (EV_P);
		1041
		1042	void inline_size
		1043	loop_fork (EV_P)
		1044	{
		1045	#if EV_USE_PORT
		1046	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1047	#endif
		1048	#if EV_USE_KQUEUE
		1049	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1050	#endif
		1051	#if EV_USE_EPOLL
		1052	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1053	#endif
		1054	#if EV_USE_INOTIFY
		1055	infy_fork (EV_A);
		1056	#endif
		1057
		1058	if (ev_is_active (&sigev))
		1059	{
		1060	/* default loop */
		1061
		1062	ev_ref (EV_A);
		1063	ev_io_stop (EV_A_ &sigev);
		1064	close (sigpipe [0]);
		1065	close (sigpipe [1]);
		1066
		1067	while (pipe (sigpipe))
		1068	syserr ("(libev) error creating pipe");
		1069
		1070	siginit (EV_A);
		1071	}
		1072
		1073	postfork = 0;
		1074	}
		1075
		1076	#if EV_MULTIPLICITY
		1077	struct ev_loop *
		1078	ev_loop_new (unsigned int flags)
		1079	{
		1080	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1081
		1082	memset (loop, 0, sizeof (struct ev_loop));
		1083
		1084	loop_init (EV_A_ flags);
		1085
		1086	if (ev_backend (EV_A))
		1087	return loop;
		1088
		1089	return 0;
		1090	}
		1091
		1092	void
		1093	ev_loop_destroy (EV_P)
		1094	{
		1095	loop_destroy (EV_A);
		1096	ev_free (loop);
		1097	}
		1098
		1099	void
		1100	ev_loop_fork (EV_P)
		1101	{
		1102	postfork = 1;
		1103	}
		1104
		1105	#endif
		1106
		1107	#if EV_MULTIPLICITY
		1108	struct ev_loop *
		1109	ev_default_loop_init (unsigned int flags)
		1110	#else
		1111	int
		1112	ev_default_loop (unsigned int flags)
		1113	#endif
		1114	{
		1115	if (sigpipe [0] == sigpipe [1])
		1116	if (pipe (sigpipe))
		1117	return 0;
		1118
		1119	if (!ev_default_loop_ptr)
		1120	{
		1121	#if EV_MULTIPLICITY
		1122	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1123	#else
		1124	ev_default_loop_ptr = 1;
		1125	#endif
		1126
		1127	loop_init (EV_A_ flags);
		1128
		1129	if (ev_backend (EV_A))
280	{	1130	{
281	p->w->pending = 0;	1131	siginit (EV_A);
282	p->w->cb (p->w, p->events);	1132
		1133	#ifndef _WIN32
		1134	ev_signal_init (&childev, childcb, SIGCHLD);
		1135	ev_set_priority (&childev, EV_MAXPRI);
		1136	ev_signal_start (EV_A_ &childev);
		1137	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1138	#endif
283	}	1139	}
		1140	else
		1141	ev_default_loop_ptr = 0;
		1142	}
		1143
		1144	return ev_default_loop_ptr;
		1145	}
		1146
		1147	void
		1148	ev_default_destroy (void)
		1149	{
		1150	#if EV_MULTIPLICITY
		1151	struct ev_loop *loop = ev_default_loop_ptr;
		1152	#endif
		1153
		1154	#ifndef _WIN32
		1155	ev_ref (EV_A); /* child watcher */
		1156	ev_signal_stop (EV_A_ &childev);
		1157	#endif
		1158
		1159	ev_ref (EV_A); /* signal watcher */
		1160	ev_io_stop (EV_A_ &sigev);
		1161
		1162	close (sigpipe [0]); sigpipe [0] = 0;
		1163	close (sigpipe [1]); sigpipe [1] = 0;
		1164
		1165	loop_destroy (EV_A);
		1166	}
		1167
		1168	void
		1169	ev_default_fork (void)
		1170	{
		1171	#if EV_MULTIPLICITY
		1172	struct ev_loop *loop = ev_default_loop_ptr;
		1173	#endif
		1174
		1175	if (backend)
		1176	postfork = 1;
		1177	}
		1178
		1179	/*****************************************************************************/
		1180
		1181	void
		1182	ev_invoke (EV_P_ void *w, int revents)
		1183	{
		1184	EV_CB_INVOKE ((W)w, revents);
		1185	}
		1186
		1187	void inline_speed
		1188	call_pending (EV_P)
		1189	{
		1190	int pri;
		1191
		1192	for (pri = NUMPRI; pri--; )
		1193	while (pendingcnt [pri])
		1194	{
		1195	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1196
		1197	if (expect_true (p->w))
		1198	{
		1199	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1200
		1201	p->w->pending = 0;
		1202	EV_CB_INVOKE (p->w, p->events);
		1203	}
284	}	1204	}
285
286	pendingcnt = 0;
287	}	1205	}
288		1206
289	static void	1207	void inline_size
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1208	timers_reify (EV_P)
291	{	1209	{
292	while (timercnt && timers [0]->at <= now)	1210	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1211	{
294	struct ev_timer *w = timers [0];	1212	ev_timer *w = timers [0];
		1213
		1214	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
295		1215
296	/* first reschedule or stop timer */	1216	/* first reschedule or stop timer */
297	if (w->repeat)	1217	if (w->repeat)
298	{	1218	{
299	if (w->is_abs)	1219	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;	1220
301	else
302	w->at = now + w->repeat;	1221	((WT)w)->at += w->repeat;
		1222	if (((WT)w)->at < mn_now)
		1223	((WT)w)->at = mn_now;
303		1224
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	1225	downheap ((WT *)timers, timercnt, 0);
307	}	1226	}
308	else	1227	else
		1228	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1229
		1230	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1231	}
		1232	}
		1233
		1234	#if EV_PERIODIC_ENABLE
		1235	void inline_size
		1236	periodics_reify (EV_P)
		1237	{
		1238	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1239	{
		1240	ev_periodic *w = periodics [0];
		1241
		1242	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1243
		1244	/* first reschedule or stop timer */
		1245	if (w->reschedule_cb)
309	{	1246	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1247	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
311	--timercnt; /* maybe pass by reference instead? */	1248	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1249	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1250	}
		1251	else if (w->interval)
		1252	{
		1253	((WT)w)->at = w->offset + floor ((ev_rt_now + TIME_EPSILON - w->offset) / w->interval + 1.) * w->interval;
		1254	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1255	downheap ((WT *)periodics, periodiccnt, 0);
		1256	}
		1257	else
		1258	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1259
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1260	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1261	}
316	}	1262	}
317		1263
318	static void	1264	static void noinline
319	time_update ()	1265	periodics_reschedule (EV_P)
320	{	1266	{
321	int i;	1267	int i;
322	ev_now = ev_time ();
323		1268
324	if (have_monotonic)	1269	/* adjust periodics after time jump */
		1270	for (i = 0; i < periodiccnt; ++i)
		1271	{
		1272	ev_periodic *w = periodics [i];
		1273
		1274	if (w->reschedule_cb)
		1275	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1276	else if (w->interval)
		1277	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
325	{	1278	}
326	ev_tstamp odiff = diff;
327		1279
328	/* detecting time jumps is much more difficult */	1280	/* now rebuild the heap */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1281	for (i = periodiccnt >> 1; i--; )
		1282	downheap ((WT *)periodics, periodiccnt, i);
		1283	}
		1284	#endif
		1285
		1286	#if EV_IDLE_ENABLE
		1287	void inline_size
		1288	idle_reify (EV_P)
		1289	{
		1290	if (expect_false (idleall))
		1291	{
		1292	int pri;
		1293
		1294	for (pri = NUMPRI; pri--; )
330	{	1295	{
331	now = get_clock ();	1296	if (pendingcnt [pri])
332	diff = ev_now - now;	1297	break;
333		1298
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1299	if (idlecnt [pri])
335	return; /* all is well */	1300	{
336		1301	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
337	ev_now = ev_time ();	1302	break;
		1303	}
338	}	1304	}
		1305	}
		1306	}
		1307	#endif
339		1308
340	/* time jump detected, reschedule atimers */	1309	int inline_size
341	for (i = 0; i < atimercnt; ++i)	1310	time_update_monotonic (EV_P)
		1311	{
		1312	mn_now = get_clock ();
		1313
		1314	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1315	{
		1316	ev_rt_now = rtmn_diff + mn_now;
		1317	return 0;
		1318	}
		1319	else
		1320	{
		1321	now_floor = mn_now;
		1322	ev_rt_now = ev_time ();
		1323	return 1;
		1324	}
		1325	}
		1326
		1327	void inline_size
		1328	time_update (EV_P)
		1329	{
		1330	int i;
		1331
		1332	#if EV_USE_MONOTONIC
		1333	if (expect_true (have_monotonic))
		1334	{
		1335	if (time_update_monotonic (EV_A))
342	{	1336	{
343	struct ev_timer *w = atimers [i];	1337	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1338
		1339	/* loop a few times, before making important decisions.
		1340	* on the choice of "4": one iteration isn't enough,
		1341	* in case we get preempted during the calls to
		1342	* ev_time and get_clock. a second call is almost guaranteed
		1343	* to succeed in that case, though. and looping a few more times
		1344	* doesn't hurt either as we only do this on time-jumps or
		1345	* in the unlikely event of having been preempted here.
		1346	*/
		1347	for (i = 4; --i; )
		1348	{
		1349	rtmn_diff = ev_rt_now - mn_now;
		1350
		1351	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1352	return; /* all is well */
		1353
		1354	ev_rt_now = ev_time ();
		1355	mn_now = get_clock ();
		1356	now_floor = mn_now;
		1357	}
		1358
		1359	# if EV_PERIODIC_ENABLE
		1360	periodics_reschedule (EV_A);
		1361	# endif
		1362	/* no timer adjustment, as the monotonic clock doesn't jump */
		1363	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	1364	}
346	}	1365	}
347	else	1366	else
		1367	#endif
348	{	1368	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1369	ev_rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	1370
		1371	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1372	{
		1373	#if EV_PERIODIC_ENABLE
		1374	periodics_reschedule (EV_A);
		1375	#endif
		1376
		1377	/* adjust timers. this is easy, as the offset is the same for all of them */
351	for (i = 0; i < rtimercnt; ++i)	1378	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	1379	((WT)timers [i])->at += ev_rt_now - mn_now;
		1380	}
353		1381
354	now = ev_now;	1382	mn_now = ev_rt_now;
355	}	1383	}
356	}	1384	}
357		1385
358	int ev_loop_done;	1386	void
		1387	ev_ref (EV_P)
		1388	{
		1389	++activecnt;
		1390	}
359		1391
		1392	void
		1393	ev_unref (EV_P)
		1394	{
		1395	--activecnt;
		1396	}
		1397
		1398	static int loop_done;
		1399
		1400	void
360	void ev_loop (int flags)	1401	ev_loop (EV_P_ int flags)
361	{	1402	{
362	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1403	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1404	? EVUNLOOP_ONE
		1405	: EVUNLOOP_CANCEL;
		1406
		1407	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
364		1408
365	do	1409	do
366	{	1410	{
		1411	#ifndef _WIN32
		1412	if (expect_false (curpid)) /* penalise the forking check even more */
		1413	if (expect_false (getpid () != curpid))
		1414	{
		1415	curpid = getpid ();
		1416	postfork = 1;
		1417	}
		1418	#endif
		1419
		1420	#if EV_FORK_ENABLE
		1421	/* we might have forked, so queue fork handlers */
		1422	if (expect_false (postfork))
		1423	if (forkcnt)
		1424	{
		1425	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1426	call_pending (EV_A);
		1427	}
		1428	#endif
		1429
		1430	/* queue prepare watchers (and execute them) */
		1431	if (expect_false (preparecnt))
		1432	{
		1433	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1434	call_pending (EV_A);
		1435	}
		1436
		1437	if (expect_false (!activecnt))
		1438	break;
		1439
		1440	/* we might have forked, so reify kernel state if necessary */
		1441	if (expect_false (postfork))
		1442	loop_fork (EV_A);
		1443
367	/* update fd-related kernel structures */	1444	/* update fd-related kernel structures */
368	fd_reify ();	1445	fd_reify (EV_A);
369		1446
370	/* calculate blocking time */	1447	/* calculate blocking time */
371	if (flags & EVLOOP_NONBLOCK)	1448	{
372	block = 0.;	1449	ev_tstamp block;
		1450
		1451	if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
		1452	block = 0.; /* do not block at all */
373	else	1453	else
374	{	1454	{
		1455	/* update time to cancel out callback processing overhead */
		1456	#if EV_USE_MONOTONIC
		1457	if (expect_true (have_monotonic))
		1458	time_update_monotonic (EV_A);
		1459	else
		1460	#endif
		1461	{
		1462	ev_rt_now = ev_time ();
		1463	mn_now = ev_rt_now;
		1464	}
		1465
375	block = MAX_BLOCKTIME;	1466	block = MAX_BLOCKTIME;
376		1467
377	if (rtimercnt)	1468	if (timercnt)
378	{	1469	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1470	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1471	if (block > to) block = to;
381	}	1472	}
382		1473
		1474	#if EV_PERIODIC_ENABLE
383	if (atimercnt)	1475	if (periodiccnt)
384	{	1476	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1477	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1478	if (block > to) block = to;
387	}	1479	}
		1480	#endif
388		1481
389	if (block < 0.) block = 0.;	1482	if (expect_false (block < 0.)) block = 0.;
390	}	1483	}
391		1484
392	method_poll (block);	1485	++loop_count;
		1486	backend_poll (EV_A_ block);
		1487	}
393		1488
394	/* update ev_now, do magic */	1489	/* update ev_rt_now, do magic */
395	time_update ();	1490	time_update (EV_A);
396		1491
397	/* put pending timers into pendign queue and reschedule them */	1492	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1493	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1494	#if EV_PERIODIC_ENABLE
400	/* relative timers second */	1495	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1496	#endif
402		1497
		1498	#if EV_IDLE_ENABLE
		1499	/* queue idle watchers unless other events are pending */
		1500	idle_reify (EV_A);
		1501	#endif
		1502
		1503	/* queue check watchers, to be executed first */
		1504	if (expect_false (checkcnt))
		1505	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1506
403	call_pending ();	1507	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1508
408	static void	1509	}
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1510	while (expect_true (activecnt && !loop_done));
		1511
		1512	if (loop_done == EVUNLOOP_ONE)
		1513	loop_done = EVUNLOOP_CANCEL;
		1514	}
		1515
		1516	void
		1517	ev_unloop (EV_P_ int how)
		1518	{
		1519	loop_done = how;
		1520	}
		1521
		1522	/*****************************************************************************/
		1523
		1524	void inline_size
		1525	wlist_add (WL *head, WL elem)
410	{	1526	{
411	elem->next = *head;	1527	elem->next = *head;
412	*head = elem;	1528	*head = elem;
413	}	1529	}
414		1530
415	static void	1531	void inline_size
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1532	wlist_del (WL *head, WL elem)
417	{	1533	{
418	while (*head)	1534	while (*head)
419	{	1535	{
420	if (*head == elem)	1536	if (*head == elem)
421	{	1537	{
…		…
425		1541
426	head = &(*head)->next;	1542	head = &(*head)->next;
427	}	1543	}
428	}	1544	}
429		1545
		1546	void inline_speed
		1547	clear_pending (EV_P_ W w)
		1548	{
		1549	if (w->pending)
		1550	{
		1551	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1552	w->pending = 0;
		1553	}
		1554	}
		1555
		1556	int
		1557	ev_clear_pending (EV_P_ void *w)
		1558	{
		1559	W w_ = (W)w;
		1560	int pending = w_->pending;
		1561
		1562	if (expect_true (pending))
		1563	{
		1564	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1565	w_->pending = 0;
		1566	p->w = 0;
		1567	return p->events;
		1568	}
		1569	else
		1570	return 0;
		1571	}
		1572
		1573	void inline_size
		1574	pri_adjust (EV_P_ W w)
		1575	{
		1576	int pri = w->priority;
		1577	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1578	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1579	w->priority = pri;
		1580	}
		1581
		1582	void inline_speed
		1583	ev_start (EV_P_ W w, int active)
		1584	{
		1585	pri_adjust (EV_A_ w);
		1586	w->active = active;
		1587	ev_ref (EV_A);
		1588	}
		1589
		1590	void inline_size
		1591	ev_stop (EV_P_ W w)
		1592	{
		1593	ev_unref (EV_A);
		1594	w->active = 0;
		1595	}
		1596
		1597	/*****************************************************************************/
		1598
		1599	void noinline
		1600	ev_io_start (EV_P_ ev_io *w)
		1601	{
		1602	int fd = w->fd;
		1603
		1604	if (expect_false (ev_is_active (w)))
		1605	return;
		1606
		1607	assert (("ev_io_start called with negative fd", fd >= 0));
		1608
		1609	ev_start (EV_A_ (W)w, 1);
		1610	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1611	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1612
		1613	fd_change (EV_A_ fd);
		1614	}
		1615
		1616	void noinline
		1617	ev_io_stop (EV_P_ ev_io *w)
		1618	{
		1619	clear_pending (EV_A_ (W)w);
		1620	if (expect_false (!ev_is_active (w)))
		1621	return;
		1622
		1623	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1624
		1625	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1626	ev_stop (EV_A_ (W)w);
		1627
		1628	fd_change (EV_A_ w->fd);
		1629	}
		1630
		1631	void noinline
		1632	ev_timer_start (EV_P_ ev_timer *w)
		1633	{
		1634	if (expect_false (ev_is_active (w)))
		1635	return;
		1636
		1637	((WT)w)->at += mn_now;
		1638
		1639	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1640
		1641	ev_start (EV_A_ (W)w, ++timercnt);
		1642	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1643	timers [timercnt - 1] = w;
		1644	upheap ((WT *)timers, timercnt - 1);
		1645
		1646	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1647	}
		1648
		1649	void noinline
		1650	ev_timer_stop (EV_P_ ev_timer *w)
		1651	{
		1652	clear_pending (EV_A_ (W)w);
		1653	if (expect_false (!ev_is_active (w)))
		1654	return;
		1655
		1656	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1657
		1658	{
		1659	int active = ((W)w)->active;
		1660
		1661	if (expect_true (--active < --timercnt))
		1662	{
		1663	timers [active] = timers [timercnt];
		1664	adjustheap ((WT *)timers, timercnt, active);
		1665	}
		1666	}
		1667
		1668	((WT)w)->at -= mn_now;
		1669
		1670	ev_stop (EV_A_ (W)w);
		1671	}
		1672
		1673	void noinline
		1674	ev_timer_again (EV_P_ ev_timer *w)
		1675	{
		1676	if (ev_is_active (w))
		1677	{
		1678	if (w->repeat)
		1679	{
		1680	((WT)w)->at = mn_now + w->repeat;
		1681	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1682	}
		1683	else
		1684	ev_timer_stop (EV_A_ w);
		1685	}
		1686	else if (w->repeat)
		1687	{
		1688	w->at = w->repeat;
		1689	ev_timer_start (EV_A_ w);
		1690	}
		1691	}
		1692
		1693	#if EV_PERIODIC_ENABLE
		1694	void noinline
		1695	ev_periodic_start (EV_P_ ev_periodic *w)
		1696	{
		1697	if (expect_false (ev_is_active (w)))
		1698	return;
		1699
		1700	if (w->reschedule_cb)
		1701	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1702	else if (w->interval)
		1703	{
		1704	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1705	/* this formula differs from the one in periodic_reify because we do not always round up */
		1706	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1707	}
		1708	else
		1709	((WT)w)->at = w->offset;
		1710
		1711	ev_start (EV_A_ (W)w, ++periodiccnt);
		1712	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1713	periodics [periodiccnt - 1] = w;
		1714	upheap ((WT *)periodics, periodiccnt - 1);
		1715
		1716	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1717	}
		1718
		1719	void noinline
		1720	ev_periodic_stop (EV_P_ ev_periodic *w)
		1721	{
		1722	clear_pending (EV_A_ (W)w);
		1723	if (expect_false (!ev_is_active (w)))
		1724	return;
		1725
		1726	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1727
		1728	{
		1729	int active = ((W)w)->active;
		1730
		1731	if (expect_true (--active < --periodiccnt))
		1732	{
		1733	periodics [active] = periodics [periodiccnt];
		1734	adjustheap ((WT *)periodics, periodiccnt, active);
		1735	}
		1736	}
		1737
		1738	ev_stop (EV_A_ (W)w);
		1739	}
		1740
		1741	void noinline
		1742	ev_periodic_again (EV_P_ ev_periodic *w)
		1743	{
		1744	/* TODO: use adjustheap and recalculation */
		1745	ev_periodic_stop (EV_A_ w);
		1746	ev_periodic_start (EV_A_ w);
		1747	}
		1748	#endif
		1749
		1750	#ifndef SA_RESTART
		1751	# define SA_RESTART 0
		1752	#endif
		1753
		1754	void noinline
		1755	ev_signal_start (EV_P_ ev_signal *w)
		1756	{
		1757	#if EV_MULTIPLICITY
		1758	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1759	#endif
		1760	if (expect_false (ev_is_active (w)))
		1761	return;
		1762
		1763	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1764
		1765	ev_start (EV_A_ (W)w, 1);
		1766	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1767	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1768
		1769	if (!((WL)w)->next)
		1770	{
		1771	#if _WIN32
		1772	signal (w->signum, sighandler);
		1773	#else
		1774	struct sigaction sa;
		1775	sa.sa_handler = sighandler;
		1776	sigfillset (&sa.sa_mask);
		1777	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1778	sigaction (w->signum, &sa, 0);
		1779	#endif
		1780	}
		1781	}
		1782
		1783	void noinline
		1784	ev_signal_stop (EV_P_ ev_signal *w)
		1785	{
		1786	clear_pending (EV_A_ (W)w);
		1787	if (expect_false (!ev_is_active (w)))
		1788	return;
		1789
		1790	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1791	ev_stop (EV_A_ (W)w);
		1792
		1793	if (!signals [w->signum - 1].head)
		1794	signal (w->signum, SIG_DFL);
		1795	}
		1796
		1797	void
		1798	ev_child_start (EV_P_ ev_child *w)
		1799	{
		1800	#if EV_MULTIPLICITY
		1801	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1802	#endif
		1803	if (expect_false (ev_is_active (w)))
		1804	return;
		1805
		1806	ev_start (EV_A_ (W)w, 1);
		1807	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1808	}
		1809
		1810	void
		1811	ev_child_stop (EV_P_ ev_child *w)
		1812	{
		1813	clear_pending (EV_A_ (W)w);
		1814	if (expect_false (!ev_is_active (w)))
		1815	return;
		1816
		1817	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1818	ev_stop (EV_A_ (W)w);
		1819	}
		1820
		1821	#if EV_STAT_ENABLE
		1822
		1823	# ifdef _WIN32
		1824	# undef lstat
		1825	# define lstat(a,b) _stati64 (a,b)
		1826	# endif
		1827
		1828	#define DEF_STAT_INTERVAL 5.0074891
		1829	#define MIN_STAT_INTERVAL 0.1074891
		1830
		1831	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1832
		1833	#if EV_USE_INOTIFY
		1834	# define EV_INOTIFY_BUFSIZE 8192
		1835
		1836	static void noinline
		1837	infy_add (EV_P_ ev_stat *w)
		1838	{
		1839	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);
		1840
		1841	if (w->wd < 0)
		1842	{
		1843	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1844
		1845	/* monitor some parent directory for speedup hints */
		1846	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1847	{
		1848	char path [4096];
		1849	strcpy (path, w->path);
		1850
		1851	do
		1852	{
		1853	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1854	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1855
		1856	char *pend = strrchr (path, '/');
		1857
		1858	if (!pend)
		1859	break; /* whoops, no '/', complain to your admin */
		1860
		1861	*pend = 0;
		1862	w->wd = inotify_add_watch (fs_fd, path, mask);
		1863	}
		1864	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1865	}
		1866	}
		1867	else
		1868	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1869
		1870	if (w->wd >= 0)
		1871	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1872	}
		1873
		1874	static void noinline
		1875	infy_del (EV_P_ ev_stat *w)
		1876	{
		1877	int slot;
		1878	int wd = w->wd;
		1879
		1880	if (wd < 0)
		1881	return;
		1882
		1883	w->wd = -2;
		1884	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1885	wlist_del (&fs_hash [slot].head, (WL)w);
		1886
		1887	/* remove this watcher, if others are watching it, they will rearm */
		1888	inotify_rm_watch (fs_fd, wd);
		1889	}
		1890
		1891	static void noinline
		1892	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1893	{
		1894	if (slot < 0)
		1895	/* overflow, need to check for all hahs slots */
		1896	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1897	infy_wd (EV_A_ slot, wd, ev);
		1898	else
		1899	{
		1900	WL w_;
		1901
		1902	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1903	{
		1904	ev_stat *w = (ev_stat *)w_;
		1905	w_ = w_->next; /* lets us remove this watcher and all before it */
		1906
		1907	if (w->wd == wd || wd == -1)
		1908	{
		1909	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1910	{
		1911	w->wd = -1;
		1912	infy_add (EV_A_ w); /* re-add, no matter what */
		1913	}
		1914
		1915	stat_timer_cb (EV_A_ &w->timer, 0);
		1916	}
		1917	}
		1918	}
		1919	}
		1920
430	static void	1921	static void
431	ev_start (struct ev_watcher *w, int active)	1922	infy_cb (EV_P_ ev_io *w, int revents)
432	{	1923	{
433	w->pending = 0;	1924	char buf [EV_INOTIFY_BUFSIZE];
434	w->active = active;	1925	struct inotify_event *ev = (struct inotify_event *)buf;
		1926	int ofs;
		1927	int len = read (fs_fd, buf, sizeof (buf));
		1928
		1929	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1930	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1931	}
		1932
		1933	void inline_size
		1934	infy_init (EV_P)
		1935	{
		1936	if (fs_fd != -2)
		1937	return;
		1938
		1939	fs_fd = inotify_init ();
		1940
		1941	if (fs_fd >= 0)
		1942	{
		1943	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1944	ev_set_priority (&fs_w, EV_MAXPRI);
		1945	ev_io_start (EV_A_ &fs_w);
		1946	}
		1947	}
		1948
		1949	void inline_size
		1950	infy_fork (EV_P)
		1951	{
		1952	int slot;
		1953
		1954	if (fs_fd < 0)
		1955	return;
		1956
		1957	close (fs_fd);
		1958	fs_fd = inotify_init ();
		1959
		1960	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1961	{
		1962	WL w_ = fs_hash [slot].head;
		1963	fs_hash [slot].head = 0;
		1964
		1965	while (w_)
		1966	{
		1967	ev_stat *w = (ev_stat *)w_;
		1968	w_ = w_->next; /* lets us add this watcher */
		1969
		1970	w->wd = -1;
		1971
		1972	if (fs_fd >= 0)
		1973	infy_add (EV_A_ w); /* re-add, no matter what */
		1974	else
		1975	ev_timer_start (EV_A_ &w->timer);
		1976	}
		1977
		1978	}
		1979	}
		1980
		1981	#endif
		1982
		1983	void
		1984	ev_stat_stat (EV_P_ ev_stat *w)
		1985	{
		1986	if (lstat (w->path, &w->attr) < 0)
		1987	w->attr.st_nlink = 0;
		1988	else if (!w->attr.st_nlink)
		1989	w->attr.st_nlink = 1;
		1990	}
		1991
		1992	static void noinline
		1993	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1994	{
		1995	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1996
		1997	/* we copy this here each the time so that */
		1998	/* prev has the old value when the callback gets invoked */
		1999	w->prev = w->attr;
		2000	ev_stat_stat (EV_A_ w);
		2001
		2002	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2003	if (
		2004	w->prev.st_dev != w->attr.st_dev
		2005	|| w->prev.st_ino != w->attr.st_ino
		2006	|| w->prev.st_mode != w->attr.st_mode
		2007	|| w->prev.st_nlink != w->attr.st_nlink
		2008	|| w->prev.st_uid != w->attr.st_uid
		2009	|| w->prev.st_gid != w->attr.st_gid
		2010	|| w->prev.st_rdev != w->attr.st_rdev
		2011	|| w->prev.st_size != w->attr.st_size
		2012	|| w->prev.st_atime != w->attr.st_atime
		2013	|| w->prev.st_mtime != w->attr.st_mtime
		2014	|| w->prev.st_ctime != w->attr.st_ctime
		2015	) {
		2016	#if EV_USE_INOTIFY
		2017	infy_del (EV_A_ w);
		2018	infy_add (EV_A_ w);
		2019	ev_stat_stat (EV_A_ w); /* avoid race... */
		2020	#endif
		2021
		2022	ev_feed_event (EV_A_ w, EV_STAT);
		2023	}
		2024	}
		2025
		2026	void
		2027	ev_stat_start (EV_P_ ev_stat *w)
		2028	{
		2029	if (expect_false (ev_is_active (w)))
		2030	return;
		2031
		2032	/* since we use memcmp, we need to clear any padding data etc. */
		2033	memset (&w->prev, 0, sizeof (ev_statdata));
		2034	memset (&w->attr, 0, sizeof (ev_statdata));
		2035
		2036	ev_stat_stat (EV_A_ w);
		2037
		2038	if (w->interval < MIN_STAT_INTERVAL)
		2039	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2040
		2041	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2042	ev_set_priority (&w->timer, ev_priority (w));
		2043
		2044	#if EV_USE_INOTIFY
		2045	infy_init (EV_A);
		2046
		2047	if (fs_fd >= 0)
		2048	infy_add (EV_A_ w);
		2049	else
		2050	#endif
		2051	ev_timer_start (EV_A_ &w->timer);
		2052
		2053	ev_start (EV_A_ (W)w, 1);
		2054	}
		2055
		2056	void
		2057	ev_stat_stop (EV_P_ ev_stat *w)
		2058	{
		2059	clear_pending (EV_A_ (W)w);
		2060	if (expect_false (!ev_is_active (w)))
		2061	return;
		2062
		2063	#if EV_USE_INOTIFY
		2064	infy_del (EV_A_ w);
		2065	#endif
		2066	ev_timer_stop (EV_A_ &w->timer);
		2067
		2068	ev_stop (EV_A_ (W)w);
		2069	}
		2070	#endif
		2071
		2072	#if EV_IDLE_ENABLE
		2073	void
		2074	ev_idle_start (EV_P_ ev_idle *w)
		2075	{
		2076	if (expect_false (ev_is_active (w)))
		2077	return;
		2078
		2079	pri_adjust (EV_A_ (W)w);
		2080
		2081	{
		2082	int active = ++idlecnt [ABSPRI (w)];
		2083
		2084	++idleall;
		2085	ev_start (EV_A_ (W)w, active);
		2086
		2087	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2088	idles [ABSPRI (w)][active - 1] = w;
		2089	}
		2090	}
		2091
		2092	void
		2093	ev_idle_stop (EV_P_ ev_idle *w)
		2094	{
		2095	clear_pending (EV_A_ (W)w);
		2096	if (expect_false (!ev_is_active (w)))
		2097	return;
		2098
		2099	{
		2100	int active = ((W)w)->active;
		2101
		2102	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2103	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2104
		2105	ev_stop (EV_A_ (W)w);
		2106	--idleall;
		2107	}
		2108	}
		2109	#endif
		2110
		2111	void
		2112	ev_prepare_start (EV_P_ ev_prepare *w)
		2113	{
		2114	if (expect_false (ev_is_active (w)))
		2115	return;
		2116
		2117	ev_start (EV_A_ (W)w, ++preparecnt);
		2118	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2119	prepares [preparecnt - 1] = w;
		2120	}
		2121
		2122	void
		2123	ev_prepare_stop (EV_P_ ev_prepare *w)
		2124	{
		2125	clear_pending (EV_A_ (W)w);
		2126	if (expect_false (!ev_is_active (w)))
		2127	return;
		2128
		2129	{
		2130	int active = ((W)w)->active;
		2131	prepares [active - 1] = prepares [--preparecnt];
		2132	((W)prepares [active - 1])->active = active;
		2133	}
		2134
		2135	ev_stop (EV_A_ (W)w);
		2136	}
		2137
		2138	void
		2139	ev_check_start (EV_P_ ev_check *w)
		2140	{
		2141	if (expect_false (ev_is_active (w)))
		2142	return;
		2143
		2144	ev_start (EV_A_ (W)w, ++checkcnt);
		2145	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2146	checks [checkcnt - 1] = w;
		2147	}
		2148
		2149	void
		2150	ev_check_stop (EV_P_ ev_check *w)
		2151	{
		2152	clear_pending (EV_A_ (W)w);
		2153	if (expect_false (!ev_is_active (w)))
		2154	return;
		2155
		2156	{
		2157	int active = ((W)w)->active;
		2158	checks [active - 1] = checks [--checkcnt];
		2159	((W)checks [active - 1])->active = active;
		2160	}
		2161
		2162	ev_stop (EV_A_ (W)w);
		2163	}
		2164
		2165	#if EV_EMBED_ENABLE
		2166	void noinline
		2167	ev_embed_sweep (EV_P_ ev_embed *w)
		2168	{
		2169	ev_loop (w->loop, EVLOOP_NONBLOCK);
435	}	2170	}
436		2171
437	static void	2172	static void
438	ev_stop (struct ev_watcher *w)	2173	embed_cb (EV_P_ ev_io *io, int revents)
439	{	2174	{
440	if (w->pending)	2175	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
441	pendings [w->pending - 1].w = 0;
442		2176
443	w->active = 0;
444	/* nop */
445	}
446
447	void
448	evio_start (struct ev_io *w)
449	{
450	if (ev_is_active (w))	2177	if (ev_cb (w))
451	return;	2178	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	2179	else
		2180	ev_embed_sweep (loop, w);
		2181	}
		2182
		2183	void
		2184	ev_embed_start (EV_P_ ev_embed *w)
		2185	{
		2186	if (expect_false (ev_is_active (w)))
		2187	return;
		2188
496	{	2189	{
497	w->at += now;	2190	struct ev_loop *loop = w->loop;
498		2191	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	2192	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	}	2193	}
504		2194
505	}	2195	ev_set_priority (&w->io, ev_priority (w));
		2196	ev_io_start (EV_A_ &w->io);
506		2197
		2198	ev_start (EV_A_ (W)w, 1);
		2199	}
		2200
507	void	2201	void
508	evtimer_stop (struct ev_timer *w)	2202	ev_embed_stop (EV_P_ ev_embed *w)
509	{	2203	{
		2204	clear_pending (EV_A_ (W)w);
510	if (!ev_is_active (w))	2205	if (expect_false (!ev_is_active (w)))
511	return;	2206	return;
512		2207
513	if (w->is_abs)	2208	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		2209
530	ev_stop ((struct ev_watcher *)w);	2210	ev_stop (EV_A_ (W)w);
531	}	2211	}
		2212	#endif
532		2213
		2214	#if EV_FORK_ENABLE
533	void	2215	void
534	evsignal_start (struct ev_signal *w)	2216	ev_fork_start (EV_P_ ev_fork *w)
535	{	2217	{
536	if (ev_is_active (w))	2218	if (expect_false (ev_is_active (w)))
537	return;	2219	return;
538		2220
539	ev_start ((struct ev_watcher *)w, 1);	2221	ev_start (EV_A_ (W)w, ++forkcnt);
540	array_needsize (signals, signalmax, w->signum, signals_init);	2222	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2223	forks [forkcnt - 1] = w;
542	}	2224	}
543		2225
544	void	2226	void
545	evsignal_stop (struct ev_signal *w)	2227	ev_fork_stop (EV_P_ ev_fork *w)
546	{	2228	{
		2229	clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	2230	if (expect_false (!ev_is_active (w)))
548	return;	2231	return;
549		2232
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2233	{
551	ev_stop ((struct ev_watcher *)w);	2234	int active = ((W)w)->active;
		2235	forks [active - 1] = forks [--forkcnt];
		2236	((W)forks [active - 1])->active = active;
		2237	}
		2238
		2239	ev_stop (EV_A_ (W)w);
552	}	2240	}
		2241	#endif
553		2242
554	/*****************************************************************************/	2243	/*****************************************************************************/
555	#if 1	2244
		2245	struct ev_once
		2246	{
		2247	ev_io io;
		2248	ev_timer to;
		2249	void (*cb)(int revents, void *arg);
		2250	void *arg;
		2251	};
556		2252
557	static void	2253	static void
558	sin_cb (struct ev_io *w, int revents)	2254	once_cb (EV_P_ struct ev_once *once, int revents)
559	{	2255	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2256	void (*cb)(int revents, void *arg) = once->cb;
		2257	void *arg = once->arg;
		2258
		2259	ev_io_stop (EV_A_ &once->io);
		2260	ev_timer_stop (EV_A_ &once->to);
		2261	ev_free (once);
		2262
		2263	cb (revents, arg);
561	}	2264	}
562		2265
563	static void	2266	static void
		2267	once_cb_io (EV_P_ ev_io *w, int revents)
		2268	{
		2269	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2270	}
		2271
		2272	static void
564	ocb (struct ev_timer *w, int revents)	2273	once_cb_to (EV_P_ ev_timer *w, int revents)
565	{	2274	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2275	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}	2276	}
570		2277
571	int main (void)	2278	void
		2279	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
572	{	2280	{
573	struct ev_io sin;	2281	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
574		2282
575	ev_init (0);	2283	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	}	2284	{
594	#endif	2285	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;	2286	return;
604	}	2287	}
605		2288
606	#endif	2289	once->cb = cb;
		2290	once->arg = arg;
607		2291
		2292	ev_init (&once->io, once_cb_io);
		2293	if (fd >= 0)
		2294	{
		2295	ev_io_set (&once->io, fd, events);
		2296	ev_io_start (EV_A_ &once->io);
		2297	}
608		2298
		2299	ev_init (&once->to, once_cb_to);
		2300	if (timeout >= 0.)
		2301	{
		2302	ev_timer_set (&once->to, timeout, 0.);
		2303	ev_timer_start (EV_A_ &once->to);
		2304	}
		2305	}
609		2306
		2307	#ifdef __cplusplus
		2308	}
		2309	#endif
610		2310

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