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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 1.181 by root, Wed Dec 12 00:17:08 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	* Better solutions welcome.
		228	*/
		229	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18		230
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	231	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	232	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		233	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21		234
		235	#if __GNUC__ >= 3
		236	# define expect(expr,value) __builtin_expect ((expr),(value))
		237	# define noinline __attribute__ ((noinline))
		238	#else
		239	# define expect(expr,value) (expr)
		240	# define noinline
		241	# if __STDC_VERSION__ < 199901L
		242	# define inline
		243	# endif
		244	#endif
		245
		246	#define expect_false(expr) expect ((expr) != 0, 0)
		247	#define expect_true(expr) expect ((expr) != 0, 1)
		248	#define inline_size static inline
		249
		250	#if EV_MINIMAL
		251	# define inline_speed static noinline
		252	#else
		253	# define inline_speed static inline
		254	#endif
		255
		256	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		257	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		258
		259	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		260	#define EMPTY2(a,b) /* used to suppress some warnings */
		261
		262	typedef ev_watcher *W;
		263	typedef ev_watcher_list *WL;
		264	typedef ev_watcher_time *WT;
		265
		266	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		267
		268	#ifdef _WIN32
		269	# include "ev_win32.c"
		270	#endif
		271
		272	/*****************************************************************************/
		273
		274	static void (*syserr_cb)(const char *msg);
		275
		276	void
		277	ev_set_syserr_cb (void (*cb)(const char *msg))
		278	{
		279	syserr_cb = cb;
		280	}
		281
		282	static void noinline
		283	syserr (const char *msg)
		284	{
		285	if (!msg)
		286	msg = "(libev) system error";
		287
		288	if (syserr_cb)
		289	syserr_cb (msg);
		290	else
		291	{
		292	perror (msg);
		293	abort ();
		294	}
		295	}
		296
		297	static void *(*alloc)(void *ptr, long size);
		298
		299	void
		300	ev_set_allocator (void *(*cb)(void *ptr, long size))
		301	{
		302	alloc = cb;
		303	}
		304
		305	inline_speed void *
		306	ev_realloc (void *ptr, long size)
		307	{
		308	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		309
		310	if (!ptr && size)
		311	{
		312	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		313	abort ();
		314	}
		315
		316	return ptr;
		317	}
		318
		319	#define ev_malloc(size) ev_realloc (0, (size))
		320	#define ev_free(ptr) ev_realloc ((ptr), 0)
		321
		322	/*****************************************************************************/
		323
		324	typedef struct
		325	{
		326	WL head;
		327	unsigned char events;
		328	unsigned char reify;
		329	#if EV_SELECT_IS_WINSOCKET
		330	SOCKET handle;
		331	#endif
		332	} ANFD;
		333
		334	typedef struct
		335	{
		336	W w;
		337	int events;
		338	} ANPENDING;
		339
		340	#if EV_USE_INOTIFY
		341	typedef struct
		342	{
		343	WL head;
		344	} ANFS;
		345	#endif
		346
		347	#if EV_MULTIPLICITY
		348
		349	struct ev_loop
		350	{
		351	ev_tstamp ev_rt_now;
		352	#define ev_rt_now ((loop)->ev_rt_now)
		353	#define VAR(name,decl) decl;
		354	#include "ev_vars.h"
		355	#undef VAR
		356	};
22	#include "ev.h"	357	#include "ev_wrap.h"
23		358
24	struct ev_watcher {	359	static struct ev_loop default_loop_struct;
25	EV_WATCHER (ev_watcher);	360	struct ev_loop *ev_default_loop_ptr;
26	};
27		361
28	struct ev_watcher_list {	362	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		363
32	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	364	ev_tstamp ev_rt_now;
34	int ev_method;	365	#define VAR(name,decl) static decl;
		366	#include "ev_vars.h"
		367	#undef VAR
35		368
36	static int have_monotonic; /* runtime */	369	static int ev_default_loop_ptr;
37		370
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	371	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	372
40	static void (*method_poll)(ev_tstamp timeout);	373	/*****************************************************************************/
41		374
42	ev_tstamp	375	ev_tstamp
43	ev_time (void)	376	ev_time (void)
44	{	377	{
45	#if HAVE_REALTIME	378	#if EV_USE_REALTIME
46	struct timespec ts;	379	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	380	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	381	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	382	#else
50	struct timeval tv;	383	struct timeval tv;
51	gettimeofday (&tv, 0);	384	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	385	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	386	#endif
54	}	387	}
55		388
56	static ev_tstamp	389	ev_tstamp inline_size
57	get_clock (void)	390	get_clock (void)
58	{	391	{
59	#if HAVE_MONOTONIC	392	#if EV_USE_MONOTONIC
60	if (have_monotonic)	393	if (expect_true (have_monotonic))
61	{	394	{
62	struct timespec ts;	395	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	396	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	397	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	398	}
66	#endif	399	#endif
67		400
68	return ev_time ();	401	return ev_time ();
69	}	402	}
70		403
		404	#if EV_MULTIPLICITY
		405	ev_tstamp
		406	ev_now (EV_P)
		407	{
		408	return ev_rt_now;
		409	}
		410	#endif
		411
		412	int inline_size
		413	array_nextsize (int elem, int cur, int cnt)
		414	{
		415	int ncur = cur + 1;
		416
		417	do
		418	ncur <<= 1;
		419	while (cnt > ncur);
		420
		421	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		422	if (elem * ncur > 4096)
		423	{
		424	ncur *= elem;
		425	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		426	ncur = ncur - sizeof (void *) * 4;
		427	ncur /= elem;
		428	}
		429
		430	return ncur;
		431	}
		432
		433	static noinline void *
		434	array_realloc (int elem, void *base, int *cur, int cnt)
		435	{
		436	*cur = array_nextsize (elem, *cur, cnt);
		437	return ev_realloc (base, elem * *cur);
		438	}
		439
71	#define array_needsize(base,cur,cnt,init) \	440	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	441	if (expect_false ((cnt) > (cur))) \
73	{ \	442	{ \
74	int newcnt = cur ? cur << 1 : 16; \	443	int ocur_ = (cur); \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	444	(base) = (type *)array_realloc \
76	base = realloc (base, sizeof (*base) * (newcnt)); \	445	(sizeof (type), (base), &(cur), (cnt)); \
77	init (base + cur, newcnt - cur); \	446	init ((base) + (ocur_), (cur) - ocur_); \
78	cur = newcnt; \	447	}
		448
		449	#if 0
		450	#define array_slim(type,stem) \
		451	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		452	{ \
		453	stem ## max = array_roundsize (stem ## cnt >> 1); \
		454	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		455	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		456	}
		457	#endif
		458
		459	#define array_free(stem, idx) \
		460	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		461
		462	/*****************************************************************************/
		463
		464	void noinline
		465	ev_feed_event (EV_P_ void *w, int revents)
		466	{
		467	W w_ = (W)w;
		468	int pri = ABSPRI (w_);
		469
		470	if (expect_false (w_->pending))
		471	pendings [pri][w_->pending - 1].events |= revents;
		472	else
79	}	473	{
		474	w_->pending = ++pendingcnt [pri];
		475	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		476	pendings [pri][w_->pending - 1].w = w_;
		477	pendings [pri][w_->pending - 1].events = revents;
		478	}
		479	}
80		480
81	typedef struct	481	void inline_speed
		482	queue_events (EV_P_ W *events, int eventcnt, int type)
82	{	483	{
83	struct ev_io *head;	484	int i;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86		485
87	static ANFD *anfds;	486	for (i = 0; i < eventcnt; ++i)
88	static int anfdmax;	487	ev_feed_event (EV_A_ events [i], type);
		488	}
89		489
90	static int *fdchanges;	490	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		491
93	static void	492	void inline_size
94	anfds_init (ANFD *base, int count)	493	anfds_init (ANFD *base, int count)
95	{	494	{
96	while (count--)	495	while (count--)
97	{	496	{
98	base->head = 0;	497	base->head = 0;
99	base->wev = base->rev = EV_NONE;	498	base->events = EV_NONE;
		499	base->reify = 0;
		500
100	++base;	501	++base;
101	}	502	}
102	}	503	}
103		504
104	typedef struct	505	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)	506	fd_event (EV_P_ int fd, int revents)
124	{	507	{
125	ANFD *anfd = anfds + fd;	508	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	509	ev_io *w;
127		510
128	for (w = anfd->head; w; w = w->next)	511	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129	{	512	{
130	int ev = w->events & events;	513	int ev = w->events & revents;
131		514
132	if (ev)	515	if (ev)
133	event ((struct ev_watcher *)w, ev);	516	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	{	517	}
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	}	518	}
159		519
160	static void	520	void
161	downheap (struct ev_timer **timers, int N, int k)	521	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	522	{
163	struct ev_timer *w = timers [k];	523	if (fd >= 0 && fd < anfdmax)
164		524	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	}	525	}
183		526
184	static struct ev_signal **signals;	527	void inline_size
185	static int signalmax;	528	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	{	529	{
247	int i;	530	int i;
248		531
249	for (i = 0; i < fdchangecnt; ++i)	532	for (i = 0; i < fdchangecnt; ++i)
250	{	533	{
251	int fd = fdchanges [i];	534	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	535	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	536	ev_io *w;
254		537
255	int wev = 0;	538	int events = 0;
256		539
257	for (w = anfd->head; w; w = w->next)	540	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
258	wev |= w->events;	541	events |= w->events;
259		542
260	if (anfd->wev != wev)	543	#if EV_SELECT_IS_WINSOCKET
		544	if (events)
261	{	545	{
262	method_modify (fd, anfd->wev, wev);	546	unsigned long argp;
263	anfd->wev = wev;	547	anfd->handle = _get_osfhandle (fd);
		548	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	549	}
		550	#endif
		551
		552	anfd->reify = 0;
		553
		554	backend_modify (EV_A_ fd, anfd->events, events);
		555	anfd->events = events;
265	}	556	}
266		557
267	fdchangecnt = 0;	558	fdchangecnt = 0;
268	}	559	}
269		560
		561	void inline_size
		562	fd_change (EV_P_ int fd)
		563	{
		564	if (expect_false (anfds [fd].reify))
		565	return;
		566
		567	anfds [fd].reify = 1;
		568
		569	++fdchangecnt;
		570	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		571	fdchanges [fdchangecnt - 1] = fd;
		572	}
		573
		574	void inline_speed
		575	fd_kill (EV_P_ int fd)
		576	{
		577	ev_io *w;
		578
		579	while ((w = (ev_io *)anfds [fd].head))
		580	{
		581	ev_io_stop (EV_A_ w);
		582	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		583	}
		584	}
		585
		586	int inline_size
		587	fd_valid (int fd)
		588	{
		589	#ifdef _WIN32
		590	return _get_osfhandle (fd) != -1;
		591	#else
		592	return fcntl (fd, F_GETFD) != -1;
		593	#endif
		594	}
		595
		596	/* called on EBADF to verify fds */
		597	static void noinline
		598	fd_ebadf (EV_P)
		599	{
		600	int fd;
		601
		602	for (fd = 0; fd < anfdmax; ++fd)
		603	if (anfds [fd].events)
		604	if (!fd_valid (fd) == -1 && errno == EBADF)
		605	fd_kill (EV_A_ fd);
		606	}
		607
		608	/* called on ENOMEM in select/poll to kill some fds and retry */
		609	static void noinline
		610	fd_enomem (EV_P)
		611	{
		612	int fd;
		613
		614	for (fd = anfdmax; fd--; )
		615	if (anfds [fd].events)
		616	{
		617	fd_kill (EV_A_ fd);
		618	return;
		619	}
		620	}
		621
		622	/* usually called after fork if backend needs to re-arm all fds from scratch */
		623	static void noinline
		624	fd_rearm_all (EV_P)
		625	{
		626	int fd;
		627
		628	for (fd = 0; fd < anfdmax; ++fd)
		629	if (anfds [fd].events)
		630	{
		631	anfds [fd].events = 0;
		632	fd_change (EV_A_ fd);
		633	}
		634	}
		635
		636	/*****************************************************************************/
		637
		638	void inline_speed
		639	upheap (WT *heap, int k)
		640	{
		641	WT w = heap [k];
		642
		643	while (k)
		644	{
		645	int p = (k - 1) >> 1;
		646
		647	if (heap [p]->at <= w->at)
		648	break;
		649
		650	heap [k] = heap [p];
		651	((W)heap [k])->active = k + 1;
		652	k = p;
		653	}
		654
		655	heap [k] = w;
		656	((W)heap [k])->active = k + 1;
		657	}
		658
		659	void inline_speed
		660	downheap (WT *heap, int N, int k)
		661	{
		662	WT w = heap [k];
		663
		664	for (;;)
		665	{
		666	int c = (k << 1) + 1;
		667
		668	if (c >= N)
		669	break;
		670
		671	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		672	? 1 : 0;
		673
		674	if (w->at <= heap [c]->at)
		675	break;
		676
		677	heap [k] = heap [c];
		678	((W)heap [k])->active = k + 1;
		679
		680	k = c;
		681	}
		682
		683	heap [k] = w;
		684	((W)heap [k])->active = k + 1;
		685	}
		686
		687	void inline_size
		688	adjustheap (WT *heap, int N, int k)
		689	{
		690	upheap (heap, k);
		691	downheap (heap, N, k);
		692	}
		693
		694	/*****************************************************************************/
		695
		696	typedef struct
		697	{
		698	WL head;
		699	sig_atomic_t volatile gotsig;
		700	} ANSIG;
		701
		702	static ANSIG *signals;
		703	static int signalmax;
		704
		705	static int sigpipe [2];
		706	static sig_atomic_t volatile gotsig;
		707	static ev_io sigev;
		708
		709	void inline_size
		710	signals_init (ANSIG *base, int count)
		711	{
		712	while (count--)
		713	{
		714	base->head = 0;
		715	base->gotsig = 0;
		716
		717	++base;
		718	}
		719	}
		720
270	static void	721	static void
271	call_pending ()	722	sighandler (int signum)
		723	{
		724	#if _WIN32
		725	signal (signum, sighandler);
		726	#endif
		727
		728	signals [signum - 1].gotsig = 1;
		729
		730	if (!gotsig)
		731	{
		732	int old_errno = errno;
		733	gotsig = 1;
		734	write (sigpipe [1], &signum, 1);
		735	errno = old_errno;
		736	}
		737	}
		738
		739	void noinline
		740	ev_feed_signal_event (EV_P_ int signum)
		741	{
		742	WL w;
		743
		744	#if EV_MULTIPLICITY
		745	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		746	#endif
		747
		748	--signum;
		749
		750	if (signum < 0 || signum >= signalmax)
		751	return;
		752
		753	signals [signum].gotsig = 0;
		754
		755	for (w = signals [signum].head; w; w = w->next)
		756	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		757	}
		758
		759	static void
		760	sigcb (EV_P_ ev_io *iow, int revents)
		761	{
		762	int signum;
		763
		764	read (sigpipe [0], &revents, 1);
		765	gotsig = 0;
		766
		767	for (signum = signalmax; signum--; )
		768	if (signals [signum].gotsig)
		769	ev_feed_signal_event (EV_A_ signum + 1);
		770	}
		771
		772	void inline_speed
		773	fd_intern (int fd)
		774	{
		775	#ifdef _WIN32
		776	int arg = 1;
		777	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		778	#else
		779	fcntl (fd, F_SETFD, FD_CLOEXEC);
		780	fcntl (fd, F_SETFL, O_NONBLOCK);
		781	#endif
		782	}
		783
		784	static void noinline
		785	siginit (EV_P)
		786	{
		787	fd_intern (sigpipe [0]);
		788	fd_intern (sigpipe [1]);
		789
		790	ev_io_set (&sigev, sigpipe [0], EV_READ);
		791	ev_io_start (EV_A_ &sigev);
		792	ev_unref (EV_A); /* child watcher should not keep loop alive */
		793	}
		794
		795	/*****************************************************************************/
		796
		797	static ev_child *childs [EV_PID_HASHSIZE];
		798
		799	#ifndef _WIN32
		800
		801	static ev_signal childev;
		802
		803	void inline_speed
		804	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		805	{
		806	ev_child *w;
		807
		808	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		809	if (w->pid == pid || !w->pid)
		810	{
		811	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
		812	w->rpid = pid;
		813	w->rstatus = status;
		814	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		815	}
		816	}
		817
		818	#ifndef WCONTINUED
		819	# define WCONTINUED 0
		820	#endif
		821
		822	static void
		823	childcb (EV_P_ ev_signal *sw, int revents)
		824	{
		825	int pid, status;
		826
		827	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
		828	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		829	if (!WCONTINUED
		830	|| errno != EINVAL
		831	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		832	return;
		833
		834	/* make sure we are called again until all childs have been reaped */
		835	/* we need to do it this way so that the callback gets called before we continue */
		836	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		837
		838	child_reap (EV_A_ sw, pid, pid, status);
		839	if (EV_PID_HASHSIZE > 1)
		840	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		841	}
		842
		843	#endif
		844
		845	/*****************************************************************************/
		846
		847	#if EV_USE_PORT
		848	# include "ev_port.c"
		849	#endif
		850	#if EV_USE_KQUEUE
		851	# include "ev_kqueue.c"
		852	#endif
		853	#if EV_USE_EPOLL
		854	# include "ev_epoll.c"
		855	#endif
		856	#if EV_USE_POLL
		857	# include "ev_poll.c"
		858	#endif
		859	#if EV_USE_SELECT
		860	# include "ev_select.c"
		861	#endif
		862
		863	int
		864	ev_version_major (void)
		865	{
		866	return EV_VERSION_MAJOR;
		867	}
		868
		869	int
		870	ev_version_minor (void)
		871	{
		872	return EV_VERSION_MINOR;
		873	}
		874
		875	/* return true if we are running with elevated privileges and should ignore env variables */
		876	int inline_size
		877	enable_secure (void)
		878	{
		879	#ifdef _WIN32
		880	return 0;
		881	#else
		882	return getuid () != geteuid ()
		883	|| getgid () != getegid ();
		884	#endif
		885	}
		886
		887	unsigned int
		888	ev_supported_backends (void)
		889	{
		890	unsigned int flags = 0;
		891
		892	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		893	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		894	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		895	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		896	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		897
		898	return flags;
		899	}
		900
		901	unsigned int
		902	ev_recommended_backends (void)
		903	{
		904	unsigned int flags = ev_supported_backends ();
		905
		906	#ifndef __NetBSD__
		907	/* kqueue is borked on everything but netbsd apparently */
		908	/* it usually doesn't work correctly on anything but sockets and pipes */
		909	flags &= ~EVBACKEND_KQUEUE;
		910	#endif
		911	#ifdef __APPLE__
		912	// flags &= ~EVBACKEND_KQUEUE; for documentation
		913	flags &= ~EVBACKEND_POLL;
		914	#endif
		915
		916	return flags;
		917	}
		918
		919	unsigned int
		920	ev_embeddable_backends (void)
		921	{
		922	return EVBACKEND_EPOLL
		923	| EVBACKEND_KQUEUE
		924	| EVBACKEND_PORT;
		925	}
		926
		927	unsigned int
		928	ev_backend (EV_P)
		929	{
		930	return backend;
		931	}
		932
		933	unsigned int
		934	ev_loop_count (EV_P)
		935	{
		936	return loop_count;
		937	}
		938
		939	static void noinline
		940	loop_init (EV_P_ unsigned int flags)
		941	{
		942	if (!backend)
		943	{
		944	#if EV_USE_MONOTONIC
		945	{
		946	struct timespec ts;
		947	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		948	have_monotonic = 1;
		949	}
		950	#endif
		951
		952	ev_rt_now = ev_time ();
		953	mn_now = get_clock ();
		954	now_floor = mn_now;
		955	rtmn_diff = ev_rt_now - mn_now;
		956
		957	/* pid check not overridable via env */
		958	#ifndef _WIN32
		959	if (flags & EVFLAG_FORKCHECK)
		960	curpid = getpid ();
		961	#endif
		962
		963	if (!(flags & EVFLAG_NOENV)
		964	&& !enable_secure ()
		965	&& getenv ("LIBEV_FLAGS"))
		966	flags = atoi (getenv ("LIBEV_FLAGS"));
		967
		968	if (!(flags & 0x0000ffffUL))
		969	flags |= ev_recommended_backends ();
		970
		971	backend = 0;
		972	backend_fd = -1;
		973	#if EV_USE_INOTIFY
		974	fs_fd = -2;
		975	#endif
		976
		977	#if EV_USE_PORT
		978	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		979	#endif
		980	#if EV_USE_KQUEUE
		981	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		982	#endif
		983	#if EV_USE_EPOLL
		984	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		985	#endif
		986	#if EV_USE_POLL
		987	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		988	#endif
		989	#if EV_USE_SELECT
		990	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		991	#endif
		992
		993	ev_init (&sigev, sigcb);
		994	ev_set_priority (&sigev, EV_MAXPRI);
		995	}
		996	}
		997
		998	static void noinline
		999	loop_destroy (EV_P)
272	{	1000	{
273	int i;	1001	int i;
274		1002
275	for (i = 0; i < pendingcnt; ++i)	1003	#if EV_USE_INOTIFY
		1004	if (fs_fd >= 0)
		1005	close (fs_fd);
		1006	#endif
		1007
		1008	if (backend_fd >= 0)
		1009	close (backend_fd);
		1010
		1011	#if EV_USE_PORT
		1012	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1013	#endif
		1014	#if EV_USE_KQUEUE
		1015	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1016	#endif
		1017	#if EV_USE_EPOLL
		1018	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1019	#endif
		1020	#if EV_USE_POLL
		1021	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1022	#endif
		1023	#if EV_USE_SELECT
		1024	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1025	#endif
		1026
		1027	for (i = NUMPRI; i--; )
		1028	{
		1029	array_free (pending, [i]);
		1030	#if EV_IDLE_ENABLE
		1031	array_free (idle, [i]);
		1032	#endif
276	{	1033	}
277	ANPENDING *p = pendings + i;
278		1034
279	if (p->w)	1035	/* have to use the microsoft-never-gets-it-right macro */
		1036	array_free (fdchange, EMPTY);
		1037	array_free (timer, EMPTY);
		1038	#if EV_PERIODIC_ENABLE
		1039	array_free (periodic, EMPTY);
		1040	#endif
		1041	array_free (prepare, EMPTY);
		1042	array_free (check, EMPTY);
		1043
		1044	backend = 0;
		1045	}
		1046
		1047	void inline_size infy_fork (EV_P);
		1048
		1049	void inline_size
		1050	loop_fork (EV_P)
		1051	{
		1052	#if EV_USE_PORT
		1053	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1054	#endif
		1055	#if EV_USE_KQUEUE
		1056	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1057	#endif
		1058	#if EV_USE_EPOLL
		1059	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1060	#endif
		1061	#if EV_USE_INOTIFY
		1062	infy_fork (EV_A);
		1063	#endif
		1064
		1065	if (ev_is_active (&sigev))
		1066	{
		1067	/* default loop */
		1068
		1069	ev_ref (EV_A);
		1070	ev_io_stop (EV_A_ &sigev);
		1071	close (sigpipe [0]);
		1072	close (sigpipe [1]);
		1073
		1074	while (pipe (sigpipe))
		1075	syserr ("(libev) error creating pipe");
		1076
		1077	siginit (EV_A);
		1078	}
		1079
		1080	postfork = 0;
		1081	}
		1082
		1083	#if EV_MULTIPLICITY
		1084	struct ev_loop *
		1085	ev_loop_new (unsigned int flags)
		1086	{
		1087	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1088
		1089	memset (loop, 0, sizeof (struct ev_loop));
		1090
		1091	loop_init (EV_A_ flags);
		1092
		1093	if (ev_backend (EV_A))
		1094	return loop;
		1095
		1096	return 0;
		1097	}
		1098
		1099	void
		1100	ev_loop_destroy (EV_P)
		1101	{
		1102	loop_destroy (EV_A);
		1103	ev_free (loop);
		1104	}
		1105
		1106	void
		1107	ev_loop_fork (EV_P)
		1108	{
		1109	postfork = 1;
		1110	}
		1111
		1112	#endif
		1113
		1114	#if EV_MULTIPLICITY
		1115	struct ev_loop *
		1116	ev_default_loop_init (unsigned int flags)
		1117	#else
		1118	int
		1119	ev_default_loop (unsigned int flags)
		1120	#endif
		1121	{
		1122	if (sigpipe [0] == sigpipe [1])
		1123	if (pipe (sigpipe))
		1124	return 0;
		1125
		1126	if (!ev_default_loop_ptr)
		1127	{
		1128	#if EV_MULTIPLICITY
		1129	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1130	#else
		1131	ev_default_loop_ptr = 1;
		1132	#endif
		1133
		1134	loop_init (EV_A_ flags);
		1135
		1136	if (ev_backend (EV_A))
280	{	1137	{
281	p->w->pending = 0;	1138	siginit (EV_A);
282	p->w->cb (p->w, p->events);	1139
		1140	#ifndef _WIN32
		1141	ev_signal_init (&childev, childcb, SIGCHLD);
		1142	ev_set_priority (&childev, EV_MAXPRI);
		1143	ev_signal_start (EV_A_ &childev);
		1144	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1145	#endif
283	}	1146	}
		1147	else
		1148	ev_default_loop_ptr = 0;
		1149	}
		1150
		1151	return ev_default_loop_ptr;
		1152	}
		1153
		1154	void
		1155	ev_default_destroy (void)
		1156	{
		1157	#if EV_MULTIPLICITY
		1158	struct ev_loop *loop = ev_default_loop_ptr;
		1159	#endif
		1160
		1161	#ifndef _WIN32
		1162	ev_ref (EV_A); /* child watcher */
		1163	ev_signal_stop (EV_A_ &childev);
		1164	#endif
		1165
		1166	ev_ref (EV_A); /* signal watcher */
		1167	ev_io_stop (EV_A_ &sigev);
		1168
		1169	close (sigpipe [0]); sigpipe [0] = 0;
		1170	close (sigpipe [1]); sigpipe [1] = 0;
		1171
		1172	loop_destroy (EV_A);
		1173	}
		1174
		1175	void
		1176	ev_default_fork (void)
		1177	{
		1178	#if EV_MULTIPLICITY
		1179	struct ev_loop *loop = ev_default_loop_ptr;
		1180	#endif
		1181
		1182	if (backend)
		1183	postfork = 1;
		1184	}
		1185
		1186	/*****************************************************************************/
		1187
		1188	void
		1189	ev_invoke (EV_P_ void *w, int revents)
		1190	{
		1191	EV_CB_INVOKE ((W)w, revents);
		1192	}
		1193
		1194	void inline_speed
		1195	call_pending (EV_P)
		1196	{
		1197	int pri;
		1198
		1199	for (pri = NUMPRI; pri--; )
		1200	while (pendingcnt [pri])
		1201	{
		1202	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1203
		1204	if (expect_true (p->w))
		1205	{
		1206	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1207
		1208	p->w->pending = 0;
		1209	EV_CB_INVOKE (p->w, p->events);
		1210	}
284	}	1211	}
285
286	pendingcnt = 0;
287	}	1212	}
288		1213
289	static void	1214	void inline_size
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1215	timers_reify (EV_P)
291	{	1216	{
292	while (timercnt && timers [0]->at <= now)	1217	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1218	{
294	struct ev_timer *w = timers [0];	1219	ev_timer *w = (ev_timer *)timers [0];
		1220
		1221	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
295		1222
296	/* first reschedule or stop timer */	1223	/* first reschedule or stop timer */
297	if (w->repeat)	1224	if (w->repeat)
298	{	1225	{
299	if (w->is_abs)	1226	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;	1227
301	else
302	w->at = now + w->repeat;	1228	((WT)w)->at += w->repeat;
303		1229	if (((WT)w)->at < mn_now)
304	assert (w->at > now);	1230	((WT)w)->at = mn_now;
305		1231
306	downheap (timers, timercnt, 0);	1232	downheap (timers, timercnt, 0);
307	}	1233	}
308	else	1234	else
		1235	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1236
		1237	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1238	}
		1239	}
		1240
		1241	#if EV_PERIODIC_ENABLE
		1242	void inline_size
		1243	periodics_reify (EV_P)
		1244	{
		1245	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1246	{
		1247	ev_periodic *w = (ev_periodic *)periodics [0];
		1248
		1249	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1250
		1251	/* first reschedule or stop timer */
		1252	if (w->reschedule_cb)
309	{	1253	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1254	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
311	--timercnt; /* maybe pass by reference instead? */	1255	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1256	downheap (periodics, periodiccnt, 0);
312	}	1257	}
		1258	else if (w->interval)
		1259	{
		1260	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1261	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1262	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1263	downheap (periodics, periodiccnt, 0);
		1264	}
		1265	else
		1266	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1267
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1268	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1269	}
316	}	1270	}
317		1271
318	static void	1272	static void noinline
319	time_update ()	1273	periodics_reschedule (EV_P)
320	{	1274	{
321	int i;	1275	int i;
322	ev_now = ev_time ();
323		1276
324	if (have_monotonic)	1277	/* adjust periodics after time jump */
		1278	for (i = 0; i < periodiccnt; ++i)
		1279	{
		1280	ev_periodic *w = (ev_periodic *)periodics [i];
		1281
		1282	if (w->reschedule_cb)
		1283	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1284	else if (w->interval)
		1285	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
325	{	1286	}
326	ev_tstamp odiff = diff;
327		1287
328	/* detecting time jumps is much more difficult */	1288	/* now rebuild the heap */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1289	for (i = periodiccnt >> 1; i--; )
		1290	downheap (periodics, periodiccnt, i);
		1291	}
		1292	#endif
		1293
		1294	#if EV_IDLE_ENABLE
		1295	void inline_size
		1296	idle_reify (EV_P)
		1297	{
		1298	if (expect_false (idleall))
		1299	{
		1300	int pri;
		1301
		1302	for (pri = NUMPRI; pri--; )
330	{	1303	{
		1304	if (pendingcnt [pri])
		1305	break;
		1306
		1307	if (idlecnt [pri])
		1308	{
		1309	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1310	break;
		1311	}
		1312	}
		1313	}
		1314	}
		1315	#endif
		1316
		1317	void inline_speed
		1318	time_update (EV_P_ ev_tstamp max_block)
		1319	{
		1320	int i;
		1321
		1322	#if EV_USE_MONOTONIC
		1323	if (expect_true (have_monotonic))
		1324	{
		1325	ev_tstamp odiff = rtmn_diff;
		1326
331	now = get_clock ();	1327	mn_now = get_clock ();
		1328
		1329	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1330	/* interpolate in the meantime */
		1331	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1332	{
		1333	ev_rt_now = rtmn_diff + mn_now;
		1334	return;
		1335	}
		1336
		1337	now_floor = mn_now;
		1338	ev_rt_now = ev_time ();
		1339
		1340	/* loop a few times, before making important decisions.
		1341	* on the choice of "4": one iteration isn't enough,
		1342	* in case we get preempted during the calls to
		1343	* ev_time and get_clock. a second call is almost guaranteed
		1344	* to succeed in that case, though. and looping a few more times
		1345	* doesn't hurt either as we only do this on time-jumps or
		1346	* in the unlikely event of having been preempted here.
		1347	*/
		1348	for (i = 4; --i; )
		1349	{
332	diff = ev_now - now;	1350	rtmn_diff = ev_rt_now - mn_now;
333		1351
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1352	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1353	return; /* all is well */
336		1354
337	ev_now = ev_time ();	1355	ev_rt_now = ev_time ();
		1356	mn_now = get_clock ();
		1357	now_floor = mn_now;
338	}	1358	}
339		1359
340	/* time jump detected, reschedule atimers */	1360	# if EV_PERIODIC_ENABLE
341	for (i = 0; i < atimercnt; ++i)	1361	periodics_reschedule (EV_A);
		1362	# endif
		1363	/* no timer adjustment, as the monotonic clock doesn't jump */
		1364	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1365	}
		1366	else
		1367	#endif
		1368	{
		1369	ev_rt_now = ev_time ();
		1370
		1371	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
342	{	1372	{
343	struct ev_timer *w = atimers [i];	1373	#if EV_PERIODIC_ENABLE
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1374	periodics_reschedule (EV_A);
		1375	#endif
		1376	/* adjust timers. this is easy, as the offset is the same for all of them */
		1377	for (i = 0; i < timercnt; ++i)
		1378	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1379	}
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		1380
354	now = ev_now;	1381	mn_now = ev_rt_now;
355	}	1382	}
356	}	1383	}
357		1384
358	int ev_loop_done;	1385	void
		1386	ev_ref (EV_P)
		1387	{
		1388	++activecnt;
		1389	}
359		1390
		1391	void
		1392	ev_unref (EV_P)
		1393	{
		1394	--activecnt;
		1395	}
		1396
		1397	static int loop_done;
		1398
		1399	void
360	void ev_loop (int flags)	1400	ev_loop (EV_P_ int flags)
361	{	1401	{
362	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1402	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1403	? EVUNLOOP_ONE
		1404	: EVUNLOOP_CANCEL;
		1405
		1406	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
364		1407
365	do	1408	do
366	{	1409	{
		1410	#ifndef _WIN32
		1411	if (expect_false (curpid)) /* penalise the forking check even more */
		1412	if (expect_false (getpid () != curpid))
		1413	{
		1414	curpid = getpid ();
		1415	postfork = 1;
		1416	}
		1417	#endif
		1418
		1419	#if EV_FORK_ENABLE
		1420	/* we might have forked, so queue fork handlers */
		1421	if (expect_false (postfork))
		1422	if (forkcnt)
		1423	{
		1424	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1425	call_pending (EV_A);
		1426	}
		1427	#endif
		1428
		1429	/* queue prepare watchers (and execute them) */
		1430	if (expect_false (preparecnt))
		1431	{
		1432	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1433	call_pending (EV_A);
		1434	}
		1435
		1436	if (expect_false (!activecnt))
		1437	break;
		1438
		1439	/* we might have forked, so reify kernel state if necessary */
		1440	if (expect_false (postfork))
		1441	loop_fork (EV_A);
		1442
367	/* update fd-related kernel structures */	1443	/* update fd-related kernel structures */
368	fd_reify ();	1444	fd_reify (EV_A);
369		1445
370	/* calculate blocking time */	1446	/* calculate blocking time */
371	if (flags & EVLOOP_NONBLOCK)	1447	{
372	block = 0.;	1448	ev_tstamp block;
		1449
		1450	if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
		1451	block = 0.; /* do not block at all */
373	else	1452	else
374	{	1453	{
		1454	/* update time to cancel out callback processing overhead */
		1455	time_update (EV_A_ 1e100);
		1456
375	block = MAX_BLOCKTIME;	1457	block = MAX_BLOCKTIME;
376		1458
377	if (rtimercnt)	1459	if (timercnt)
378	{	1460	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1461	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1462	if (block > to) block = to;
381	}	1463	}
382		1464
		1465	#if EV_PERIODIC_ENABLE
383	if (atimercnt)	1466	if (periodiccnt)
384	{	1467	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1468	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1469	if (block > to) block = to;
387	}	1470	}
		1471	#endif
388		1472
389	if (block < 0.) block = 0.;	1473	if (expect_false (block < 0.)) block = 0.;
390	}	1474	}
391		1475
392	method_poll (block);	1476	++loop_count;
		1477	backend_poll (EV_A_ block);
393		1478
394	/* update ev_now, do magic */	1479	/* update ev_rt_now, do magic */
395	time_update ();	1480	time_update (EV_A_ block);
		1481	}
396		1482
397	/* put pending timers into pendign queue and reschedule them */	1483	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1484	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1485	#if EV_PERIODIC_ENABLE
400	/* relative timers second */	1486	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1487	#endif
402		1488
		1489	#if EV_IDLE_ENABLE
		1490	/* queue idle watchers unless other events are pending */
		1491	idle_reify (EV_A);
		1492	#endif
		1493
		1494	/* queue check watchers, to be executed first */
		1495	if (expect_false (checkcnt))
		1496	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1497
403	call_pending ();	1498	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1499
408	static void	1500	}
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1501	while (expect_true (activecnt && !loop_done));
		1502
		1503	if (loop_done == EVUNLOOP_ONE)
		1504	loop_done = EVUNLOOP_CANCEL;
		1505	}
		1506
		1507	void
		1508	ev_unloop (EV_P_ int how)
		1509	{
		1510	loop_done = how;
		1511	}
		1512
		1513	/*****************************************************************************/
		1514
		1515	void inline_size
		1516	wlist_add (WL *head, WL elem)
410	{	1517	{
411	elem->next = *head;	1518	elem->next = *head;
412	*head = elem;	1519	*head = elem;
413	}	1520	}
414		1521
415	static void	1522	void inline_size
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1523	wlist_del (WL *head, WL elem)
417	{	1524	{
418	while (*head)	1525	while (*head)
419	{	1526	{
420	if (*head == elem)	1527	if (*head == elem)
421	{	1528	{
…		…
425		1532
426	head = &(*head)->next;	1533	head = &(*head)->next;
427	}	1534	}
428	}	1535	}
429		1536
		1537	void inline_speed
		1538	clear_pending (EV_P_ W w)
		1539	{
		1540	if (w->pending)
		1541	{
		1542	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1543	w->pending = 0;
		1544	}
		1545	}
		1546
		1547	int
		1548	ev_clear_pending (EV_P_ void *w)
		1549	{
		1550	W w_ = (W)w;
		1551	int pending = w_->pending;
		1552
		1553	if (expect_true (pending))
		1554	{
		1555	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1556	w_->pending = 0;
		1557	p->w = 0;
		1558	return p->events;
		1559	}
		1560	else
		1561	return 0;
		1562	}
		1563
		1564	void inline_size
		1565	pri_adjust (EV_P_ W w)
		1566	{
		1567	int pri = w->priority;
		1568	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1569	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1570	w->priority = pri;
		1571	}
		1572
		1573	void inline_speed
		1574	ev_start (EV_P_ W w, int active)
		1575	{
		1576	pri_adjust (EV_A_ w);
		1577	w->active = active;
		1578	ev_ref (EV_A);
		1579	}
		1580
		1581	void inline_size
		1582	ev_stop (EV_P_ W w)
		1583	{
		1584	ev_unref (EV_A);
		1585	w->active = 0;
		1586	}
		1587
		1588	/*****************************************************************************/
		1589
		1590	void noinline
		1591	ev_io_start (EV_P_ ev_io *w)
		1592	{
		1593	int fd = w->fd;
		1594
		1595	if (expect_false (ev_is_active (w)))
		1596	return;
		1597
		1598	assert (("ev_io_start called with negative fd", fd >= 0));
		1599
		1600	ev_start (EV_A_ (W)w, 1);
		1601	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1602	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1603
		1604	fd_change (EV_A_ fd);
		1605	}
		1606
		1607	void noinline
		1608	ev_io_stop (EV_P_ ev_io *w)
		1609	{
		1610	clear_pending (EV_A_ (W)w);
		1611	if (expect_false (!ev_is_active (w)))
		1612	return;
		1613
		1614	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1615
		1616	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1617	ev_stop (EV_A_ (W)w);
		1618
		1619	fd_change (EV_A_ w->fd);
		1620	}
		1621
		1622	void noinline
		1623	ev_timer_start (EV_P_ ev_timer *w)
		1624	{
		1625	if (expect_false (ev_is_active (w)))
		1626	return;
		1627
		1628	((WT)w)->at += mn_now;
		1629
		1630	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1631
		1632	ev_start (EV_A_ (W)w, ++timercnt);
		1633	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1634	timers [timercnt - 1] = (WT)w;
		1635	upheap (timers, timercnt - 1);
		1636
		1637	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1638	}
		1639
		1640	void noinline
		1641	ev_timer_stop (EV_P_ ev_timer *w)
		1642	{
		1643	clear_pending (EV_A_ (W)w);
		1644	if (expect_false (!ev_is_active (w)))
		1645	return;
		1646
		1647	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1648
		1649	{
		1650	int active = ((W)w)->active;
		1651
		1652	if (expect_true (--active < --timercnt))
		1653	{
		1654	timers [active] = timers [timercnt];
		1655	adjustheap (timers, timercnt, active);
		1656	}
		1657	}
		1658
		1659	((WT)w)->at -= mn_now;
		1660
		1661	ev_stop (EV_A_ (W)w);
		1662	}
		1663
		1664	void noinline
		1665	ev_timer_again (EV_P_ ev_timer *w)
		1666	{
		1667	if (ev_is_active (w))
		1668	{
		1669	if (w->repeat)
		1670	{
		1671	((WT)w)->at = mn_now + w->repeat;
		1672	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1673	}
		1674	else
		1675	ev_timer_stop (EV_A_ w);
		1676	}
		1677	else if (w->repeat)
		1678	{
		1679	w->at = w->repeat;
		1680	ev_timer_start (EV_A_ w);
		1681	}
		1682	}
		1683
		1684	#if EV_PERIODIC_ENABLE
		1685	void noinline
		1686	ev_periodic_start (EV_P_ ev_periodic *w)
		1687	{
		1688	if (expect_false (ev_is_active (w)))
		1689	return;
		1690
		1691	if (w->reschedule_cb)
		1692	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1693	else if (w->interval)
		1694	{
		1695	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1696	/* this formula differs from the one in periodic_reify because we do not always round up */
		1697	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1698	}
		1699	else
		1700	((WT)w)->at = w->offset;
		1701
		1702	ev_start (EV_A_ (W)w, ++periodiccnt);
		1703	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
		1704	periodics [periodiccnt - 1] = (WT)w;
		1705	upheap (periodics, periodiccnt - 1);
		1706
		1707	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1708	}
		1709
		1710	void noinline
		1711	ev_periodic_stop (EV_P_ ev_periodic *w)
		1712	{
		1713	clear_pending (EV_A_ (W)w);
		1714	if (expect_false (!ev_is_active (w)))
		1715	return;
		1716
		1717	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1718
		1719	{
		1720	int active = ((W)w)->active;
		1721
		1722	if (expect_true (--active < --periodiccnt))
		1723	{
		1724	periodics [active] = periodics [periodiccnt];
		1725	adjustheap (periodics, periodiccnt, active);
		1726	}
		1727	}
		1728
		1729	ev_stop (EV_A_ (W)w);
		1730	}
		1731
		1732	void noinline
		1733	ev_periodic_again (EV_P_ ev_periodic *w)
		1734	{
		1735	/* TODO: use adjustheap and recalculation */
		1736	ev_periodic_stop (EV_A_ w);
		1737	ev_periodic_start (EV_A_ w);
		1738	}
		1739	#endif
		1740
		1741	#ifndef SA_RESTART
		1742	# define SA_RESTART 0
		1743	#endif
		1744
		1745	void noinline
		1746	ev_signal_start (EV_P_ ev_signal *w)
		1747	{
		1748	#if EV_MULTIPLICITY
		1749	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1750	#endif
		1751	if (expect_false (ev_is_active (w)))
		1752	return;
		1753
		1754	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1755
		1756	{
		1757	#ifndef _WIN32
		1758	sigset_t full, prev;
		1759	sigfillset (&full);
		1760	sigprocmask (SIG_SETMASK, &full, &prev);
		1761	#endif
		1762
		1763	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1764
		1765	#ifndef _WIN32
		1766	sigprocmask (SIG_SETMASK, &prev, 0);
		1767	#endif
		1768	}
		1769
		1770	ev_start (EV_A_ (W)w, 1);
		1771	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1772
		1773	if (!((WL)w)->next)
		1774	{
		1775	#if _WIN32
		1776	signal (w->signum, sighandler);
		1777	#else
		1778	struct sigaction sa;
		1779	sa.sa_handler = sighandler;
		1780	sigfillset (&sa.sa_mask);
		1781	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1782	sigaction (w->signum, &sa, 0);
		1783	#endif
		1784	}
		1785	}
		1786
		1787	void noinline
		1788	ev_signal_stop (EV_P_ ev_signal *w)
		1789	{
		1790	clear_pending (EV_A_ (W)w);
		1791	if (expect_false (!ev_is_active (w)))
		1792	return;
		1793
		1794	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1795	ev_stop (EV_A_ (W)w);
		1796
		1797	if (!signals [w->signum - 1].head)
		1798	signal (w->signum, SIG_DFL);
		1799	}
		1800
		1801	void
		1802	ev_child_start (EV_P_ ev_child *w)
		1803	{
		1804	#if EV_MULTIPLICITY
		1805	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1806	#endif
		1807	if (expect_false (ev_is_active (w)))
		1808	return;
		1809
		1810	ev_start (EV_A_ (W)w, 1);
		1811	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1812	}
		1813
		1814	void
		1815	ev_child_stop (EV_P_ ev_child *w)
		1816	{
		1817	clear_pending (EV_A_ (W)w);
		1818	if (expect_false (!ev_is_active (w)))
		1819	return;
		1820
		1821	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1822	ev_stop (EV_A_ (W)w);
		1823	}
		1824
		1825	#if EV_STAT_ENABLE
		1826
		1827	# ifdef _WIN32
		1828	# undef lstat
		1829	# define lstat(a,b) _stati64 (a,b)
		1830	# endif
		1831
		1832	#define DEF_STAT_INTERVAL 5.0074891
		1833	#define MIN_STAT_INTERVAL 0.1074891
		1834
		1835	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1836
		1837	#if EV_USE_INOTIFY
		1838	# define EV_INOTIFY_BUFSIZE 8192
		1839
		1840	static void noinline
		1841	infy_add (EV_P_ ev_stat *w)
		1842	{
		1843	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);
		1844
		1845	if (w->wd < 0)
		1846	{
		1847	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1848
		1849	/* monitor some parent directory for speedup hints */
		1850	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1851	{
		1852	char path [4096];
		1853	strcpy (path, w->path);
		1854
		1855	do
		1856	{
		1857	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1858	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1859
		1860	char *pend = strrchr (path, '/');
		1861
		1862	if (!pend)
		1863	break; /* whoops, no '/', complain to your admin */
		1864
		1865	*pend = 0;
		1866	w->wd = inotify_add_watch (fs_fd, path, mask);
		1867	}
		1868	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1869	}
		1870	}
		1871	else
		1872	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1873
		1874	if (w->wd >= 0)
		1875	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1876	}
		1877
		1878	static void noinline
		1879	infy_del (EV_P_ ev_stat *w)
		1880	{
		1881	int slot;
		1882	int wd = w->wd;
		1883
		1884	if (wd < 0)
		1885	return;
		1886
		1887	w->wd = -2;
		1888	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1889	wlist_del (&fs_hash [slot].head, (WL)w);
		1890
		1891	/* remove this watcher, if others are watching it, they will rearm */
		1892	inotify_rm_watch (fs_fd, wd);
		1893	}
		1894
		1895	static void noinline
		1896	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1897	{
		1898	if (slot < 0)
		1899	/* overflow, need to check for all hahs slots */
		1900	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1901	infy_wd (EV_A_ slot, wd, ev);
		1902	else
		1903	{
		1904	WL w_;
		1905
		1906	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1907	{
		1908	ev_stat *w = (ev_stat *)w_;
		1909	w_ = w_->next; /* lets us remove this watcher and all before it */
		1910
		1911	if (w->wd == wd || wd == -1)
		1912	{
		1913	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1914	{
		1915	w->wd = -1;
		1916	infy_add (EV_A_ w); /* re-add, no matter what */
		1917	}
		1918
		1919	stat_timer_cb (EV_A_ &w->timer, 0);
		1920	}
		1921	}
		1922	}
		1923	}
		1924
430	static void	1925	static void
431	ev_start (struct ev_watcher *w, int active)	1926	infy_cb (EV_P_ ev_io *w, int revents)
432	{	1927	{
433	w->pending = 0;	1928	char buf [EV_INOTIFY_BUFSIZE];
434	w->active = active;	1929	struct inotify_event *ev = (struct inotify_event *)buf;
		1930	int ofs;
		1931	int len = read (fs_fd, buf, sizeof (buf));
		1932
		1933	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1934	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1935	}
		1936
		1937	void inline_size
		1938	infy_init (EV_P)
		1939	{
		1940	if (fs_fd != -2)
		1941	return;
		1942
		1943	fs_fd = inotify_init ();
		1944
		1945	if (fs_fd >= 0)
		1946	{
		1947	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1948	ev_set_priority (&fs_w, EV_MAXPRI);
		1949	ev_io_start (EV_A_ &fs_w);
		1950	}
		1951	}
		1952
		1953	void inline_size
		1954	infy_fork (EV_P)
		1955	{
		1956	int slot;
		1957
		1958	if (fs_fd < 0)
		1959	return;
		1960
		1961	close (fs_fd);
		1962	fs_fd = inotify_init ();
		1963
		1964	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1965	{
		1966	WL w_ = fs_hash [slot].head;
		1967	fs_hash [slot].head = 0;
		1968
		1969	while (w_)
		1970	{
		1971	ev_stat *w = (ev_stat *)w_;
		1972	w_ = w_->next; /* lets us add this watcher */
		1973
		1974	w->wd = -1;
		1975
		1976	if (fs_fd >= 0)
		1977	infy_add (EV_A_ w); /* re-add, no matter what */
		1978	else
		1979	ev_timer_start (EV_A_ &w->timer);
		1980	}
		1981
		1982	}
		1983	}
		1984
		1985	#endif
		1986
		1987	void
		1988	ev_stat_stat (EV_P_ ev_stat *w)
		1989	{
		1990	if (lstat (w->path, &w->attr) < 0)
		1991	w->attr.st_nlink = 0;
		1992	else if (!w->attr.st_nlink)
		1993	w->attr.st_nlink = 1;
		1994	}
		1995
		1996	static void noinline
		1997	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1998	{
		1999	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2000
		2001	/* we copy this here each the time so that */
		2002	/* prev has the old value when the callback gets invoked */
		2003	w->prev = w->attr;
		2004	ev_stat_stat (EV_A_ w);
		2005
		2006	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2007	if (
		2008	w->prev.st_dev != w->attr.st_dev
		2009	|| w->prev.st_ino != w->attr.st_ino
		2010	|| w->prev.st_mode != w->attr.st_mode
		2011	|| w->prev.st_nlink != w->attr.st_nlink
		2012	|| w->prev.st_uid != w->attr.st_uid
		2013	|| w->prev.st_gid != w->attr.st_gid
		2014	|| w->prev.st_rdev != w->attr.st_rdev
		2015	|| w->prev.st_size != w->attr.st_size
		2016	|| w->prev.st_atime != w->attr.st_atime
		2017	|| w->prev.st_mtime != w->attr.st_mtime
		2018	|| w->prev.st_ctime != w->attr.st_ctime
		2019	) {
		2020	#if EV_USE_INOTIFY
		2021	infy_del (EV_A_ w);
		2022	infy_add (EV_A_ w);
		2023	ev_stat_stat (EV_A_ w); /* avoid race... */
		2024	#endif
		2025
		2026	ev_feed_event (EV_A_ w, EV_STAT);
		2027	}
		2028	}
		2029
		2030	void
		2031	ev_stat_start (EV_P_ ev_stat *w)
		2032	{
		2033	if (expect_false (ev_is_active (w)))
		2034	return;
		2035
		2036	/* since we use memcmp, we need to clear any padding data etc. */
		2037	memset (&w->prev, 0, sizeof (ev_statdata));
		2038	memset (&w->attr, 0, sizeof (ev_statdata));
		2039
		2040	ev_stat_stat (EV_A_ w);
		2041
		2042	if (w->interval < MIN_STAT_INTERVAL)
		2043	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2044
		2045	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2046	ev_set_priority (&w->timer, ev_priority (w));
		2047
		2048	#if EV_USE_INOTIFY
		2049	infy_init (EV_A);
		2050
		2051	if (fs_fd >= 0)
		2052	infy_add (EV_A_ w);
		2053	else
		2054	#endif
		2055	ev_timer_start (EV_A_ &w->timer);
		2056
		2057	ev_start (EV_A_ (W)w, 1);
		2058	}
		2059
		2060	void
		2061	ev_stat_stop (EV_P_ ev_stat *w)
		2062	{
		2063	clear_pending (EV_A_ (W)w);
		2064	if (expect_false (!ev_is_active (w)))
		2065	return;
		2066
		2067	#if EV_USE_INOTIFY
		2068	infy_del (EV_A_ w);
		2069	#endif
		2070	ev_timer_stop (EV_A_ &w->timer);
		2071
		2072	ev_stop (EV_A_ (W)w);
		2073	}
		2074	#endif
		2075
		2076	#if EV_IDLE_ENABLE
		2077	void
		2078	ev_idle_start (EV_P_ ev_idle *w)
		2079	{
		2080	if (expect_false (ev_is_active (w)))
		2081	return;
		2082
		2083	pri_adjust (EV_A_ (W)w);
		2084
		2085	{
		2086	int active = ++idlecnt [ABSPRI (w)];
		2087
		2088	++idleall;
		2089	ev_start (EV_A_ (W)w, active);
		2090
		2091	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2092	idles [ABSPRI (w)][active - 1] = w;
		2093	}
		2094	}
		2095
		2096	void
		2097	ev_idle_stop (EV_P_ ev_idle *w)
		2098	{
		2099	clear_pending (EV_A_ (W)w);
		2100	if (expect_false (!ev_is_active (w)))
		2101	return;
		2102
		2103	{
		2104	int active = ((W)w)->active;
		2105
		2106	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2107	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2108
		2109	ev_stop (EV_A_ (W)w);
		2110	--idleall;
		2111	}
		2112	}
		2113	#endif
		2114
		2115	void
		2116	ev_prepare_start (EV_P_ ev_prepare *w)
		2117	{
		2118	if (expect_false (ev_is_active (w)))
		2119	return;
		2120
		2121	ev_start (EV_A_ (W)w, ++preparecnt);
		2122	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2123	prepares [preparecnt - 1] = w;
		2124	}
		2125
		2126	void
		2127	ev_prepare_stop (EV_P_ ev_prepare *w)
		2128	{
		2129	clear_pending (EV_A_ (W)w);
		2130	if (expect_false (!ev_is_active (w)))
		2131	return;
		2132
		2133	{
		2134	int active = ((W)w)->active;
		2135	prepares [active - 1] = prepares [--preparecnt];
		2136	((W)prepares [active - 1])->active = active;
		2137	}
		2138
		2139	ev_stop (EV_A_ (W)w);
		2140	}
		2141
		2142	void
		2143	ev_check_start (EV_P_ ev_check *w)
		2144	{
		2145	if (expect_false (ev_is_active (w)))
		2146	return;
		2147
		2148	ev_start (EV_A_ (W)w, ++checkcnt);
		2149	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2150	checks [checkcnt - 1] = w;
		2151	}
		2152
		2153	void
		2154	ev_check_stop (EV_P_ ev_check *w)
		2155	{
		2156	clear_pending (EV_A_ (W)w);
		2157	if (expect_false (!ev_is_active (w)))
		2158	return;
		2159
		2160	{
		2161	int active = ((W)w)->active;
		2162	checks [active - 1] = checks [--checkcnt];
		2163	((W)checks [active - 1])->active = active;
		2164	}
		2165
		2166	ev_stop (EV_A_ (W)w);
		2167	}
		2168
		2169	#if EV_EMBED_ENABLE
		2170	void noinline
		2171	ev_embed_sweep (EV_P_ ev_embed *w)
		2172	{
		2173	ev_loop (w->loop, EVLOOP_NONBLOCK);
435	}	2174	}
436		2175
437	static void	2176	static void
438	ev_stop (struct ev_watcher *w)	2177	embed_cb (EV_P_ ev_io *io, int revents)
439	{	2178	{
440	if (w->pending)	2179	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
441	pendings [w->pending - 1].w = 0;
442		2180
443	w->active = 0;
444	/* nop */
445	}
446
447	void
448	evio_start (struct ev_io *w)
449	{
450	if (ev_is_active (w))	2181	if (ev_cb (w))
451	return;	2182	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	2183	else
		2184	ev_embed_sweep (loop, w);
		2185	}
		2186
		2187	void
		2188	ev_embed_start (EV_P_ ev_embed *w)
		2189	{
		2190	if (expect_false (ev_is_active (w)))
		2191	return;
		2192
496	{	2193	{
497	w->at += now;	2194	struct ev_loop *loop = w->loop;
498		2195	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	2196	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	}	2197	}
504		2198
505	}	2199	ev_set_priority (&w->io, ev_priority (w));
		2200	ev_io_start (EV_A_ &w->io);
506		2201
		2202	ev_start (EV_A_ (W)w, 1);
		2203	}
		2204
507	void	2205	void
508	evtimer_stop (struct ev_timer *w)	2206	ev_embed_stop (EV_P_ ev_embed *w)
509	{	2207	{
		2208	clear_pending (EV_A_ (W)w);
510	if (!ev_is_active (w))	2209	if (expect_false (!ev_is_active (w)))
511	return;	2210	return;
512		2211
513	if (w->is_abs)	2212	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		2213
530	ev_stop ((struct ev_watcher *)w);	2214	ev_stop (EV_A_ (W)w);
531	}	2215	}
		2216	#endif
532		2217
		2218	#if EV_FORK_ENABLE
533	void	2219	void
534	evsignal_start (struct ev_signal *w)	2220	ev_fork_start (EV_P_ ev_fork *w)
535	{	2221	{
536	if (ev_is_active (w))	2222	if (expect_false (ev_is_active (w)))
537	return;	2223	return;
538		2224
539	ev_start ((struct ev_watcher *)w, 1);	2225	ev_start (EV_A_ (W)w, ++forkcnt);
540	array_needsize (signals, signalmax, w->signum, signals_init);	2226	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2227	forks [forkcnt - 1] = w;
542	}	2228	}
543		2229
544	void	2230	void
545	evsignal_stop (struct ev_signal *w)	2231	ev_fork_stop (EV_P_ ev_fork *w)
546	{	2232	{
		2233	clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	2234	if (expect_false (!ev_is_active (w)))
548	return;	2235	return;
549		2236
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2237	{
551	ev_stop ((struct ev_watcher *)w);	2238	int active = ((W)w)->active;
		2239	forks [active - 1] = forks [--forkcnt];
		2240	((W)forks [active - 1])->active = active;
		2241	}
		2242
		2243	ev_stop (EV_A_ (W)w);
552	}	2244	}
		2245	#endif
553		2246
554	/*****************************************************************************/	2247	/*****************************************************************************/
555	#if 1	2248
		2249	struct ev_once
		2250	{
		2251	ev_io io;
		2252	ev_timer to;
		2253	void (*cb)(int revents, void *arg);
		2254	void *arg;
		2255	};
556		2256
557	static void	2257	static void
558	sin_cb (struct ev_io *w, int revents)	2258	once_cb (EV_P_ struct ev_once *once, int revents)
559	{	2259	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2260	void (*cb)(int revents, void *arg) = once->cb;
		2261	void *arg = once->arg;
		2262
		2263	ev_io_stop (EV_A_ &once->io);
		2264	ev_timer_stop (EV_A_ &once->to);
		2265	ev_free (once);
		2266
		2267	cb (revents, arg);
561	}	2268	}
562		2269
563	static void	2270	static void
		2271	once_cb_io (EV_P_ ev_io *w, int revents)
		2272	{
		2273	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2274	}
		2275
		2276	static void
564	ocb (struct ev_timer *w, int revents)	2277	once_cb_to (EV_P_ ev_timer *w, int revents)
565	{	2278	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2279	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}	2280	}
570		2281
571	int main (void)	2282	void
		2283	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
572	{	2284	{
573	struct ev_io sin;	2285	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
574		2286
575	ev_init (0);	2287	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	}	2288	{
594	#endif	2289	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;	2290	return;
604	}	2291	}
605		2292
606	#endif	2293	once->cb = cb;
		2294	once->arg = arg;
607		2295
		2296	ev_init (&once->io, once_cb_io);
		2297	if (fd >= 0)
		2298	{
		2299	ev_io_set (&once->io, fd, events);
		2300	ev_io_start (EV_A_ &once->io);
		2301	}
608		2302
		2303	ev_init (&once->to, once_cb_to);
		2304	if (timeout >= 0.)
		2305	{
		2306	ev_timer_set (&once->to, timeout, 0.);
		2307	ev_timer_start (EV_A_ &once->to);
		2308	}
		2309	}
609		2310
		2311	#ifdef __cplusplus
		2312	}
		2313	#endif
610		2314

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