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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 1.196 by root, Sat Dec 22 12:43:28 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_NANOSLEEP
		60	# if HAVE_NANOSLEEP
		61	# define EV_USE_NANOSLEEP 1
		62	# else
		63	# define EV_USE_NANOSLEEP 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_SELECT
		68	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		69	# define EV_USE_SELECT 1
		70	# else
		71	# define EV_USE_SELECT 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_POLL
		76	# if HAVE_POLL && HAVE_POLL_H
		77	# define EV_USE_POLL 1
		78	# else
		79	# define EV_USE_POLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_EPOLL
		84	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		85	# define EV_USE_EPOLL 1
		86	# else
		87	# define EV_USE_EPOLL 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_KQUEUE
		92	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		93	# define EV_USE_KQUEUE 1
		94	# else
		95	# define EV_USE_KQUEUE 0
		96	# endif
		97	# endif
		98
		99	# ifndef EV_USE_PORT
		100	# if HAVE_PORT_H && HAVE_PORT_CREATE
		101	# define EV_USE_PORT 1
		102	# else
		103	# define EV_USE_PORT 0
		104	# endif
		105	# endif
		106
		107	# ifndef EV_USE_INOTIFY
		108	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		109	# define EV_USE_INOTIFY 1
		110	# else
		111	# define EV_USE_INOTIFY 0
		112	# endif
		113	# endif
		114
		115	#endif
		116
1	#include <math.h>	117	#include <math.h>
2	#include <stdlib.h>	118	#include <stdlib.h>
		119	#include <fcntl.h>
		120	#include <stddef.h>
3		121
4	#include <stdio.h>	122	#include <stdio.h>
5		123
6	#include <assert.h>	124	#include <assert.h>
7	#include <errno.h>	125	#include <errno.h>
8	#include <sys/time.h>	126	#include <sys/types.h>
9	#include <time.h>	127	#include <time.h>
10		128
		129	#include <signal.h>
		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
		134	# include "ev.h"
		135	#endif
		136
		137	#ifndef _WIN32
		138	# include <sys/time.h>
		139	# include <sys/wait.h>
		140	# include <unistd.h>
		141	#else
		142	# define WIN32_LEAN_AND_MEAN
		143	# include <windows.h>
		144	# ifndef EV_SELECT_IS_WINSOCKET
		145	# define EV_SELECT_IS_WINSOCKET 1
		146	# endif
		147	#endif
		148
		149	/**/
		150
		151	#ifndef EV_USE_MONOTONIC
		152	# define EV_USE_MONOTONIC 0
		153	#endif
		154
		155	#ifndef EV_USE_REALTIME
		156	# define EV_USE_REALTIME 0
		157	#endif
		158
		159	#ifndef EV_USE_NANOSLEEP
		160	# define EV_USE_NANOSLEEP 0
		161	#endif
		162
		163	#ifndef EV_USE_SELECT
		164	# define EV_USE_SELECT 1
		165	#endif
		166
		167	#ifndef EV_USE_POLL
		168	# ifdef _WIN32
		169	# define EV_USE_POLL 0
		170	# else
		171	# define EV_USE_POLL 1
		172	# endif
		173	#endif
		174
		175	#ifndef EV_USE_EPOLL
		176	# define EV_USE_EPOLL 0
		177	#endif
		178
		179	#ifndef EV_USE_KQUEUE
		180	# define EV_USE_KQUEUE 0
		181	#endif
		182
		183	#ifndef EV_USE_PORT
		184	# define EV_USE_PORT 0
		185	#endif
		186
		187	#ifndef EV_USE_INOTIFY
		188	# define EV_USE_INOTIFY 0
		189	#endif
		190
		191	#ifndef EV_PID_HASHSIZE
		192	# if EV_MINIMAL
		193	# define EV_PID_HASHSIZE 1
		194	# else
		195	# define EV_PID_HASHSIZE 16
		196	# endif
		197	#endif
		198
		199	#ifndef EV_INOTIFY_HASHSIZE
		200	# if EV_MINIMAL
		201	# define EV_INOTIFY_HASHSIZE 1
		202	# else
		203	# define EV_INOTIFY_HASHSIZE 16
		204	# endif
		205	#endif
		206
		207	/**/
		208
11	#ifdef CLOCK_MONOTONIC	209	#ifndef CLOCK_MONOTONIC
		210	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	211	# define EV_USE_MONOTONIC 0
		212	#endif
		213
		214	#ifndef CLOCK_REALTIME
		215	# undef EV_USE_REALTIME
		216	# define EV_USE_REALTIME 0
		217	#endif
		218
		219	#if !EV_STAT_ENABLE
		220	# undef EV_USE_INOTIFY
		221	# define EV_USE_INOTIFY 0
		222	#endif
		223
		224	#if !EV_USE_NANOSLEEP
		225	# ifndef _WIN32
		226	# include <sys/select.h>
13	#endif	227	# endif
		228	#endif
14		229
15	#define HAVE_REALTIME 1	230	#if EV_USE_INOTIFY
16	#define HAVE_EPOLL 1	231	# include <sys/inotify.h>
17	#define HAVE_SELECT 1	232	#endif
		233
		234	#if EV_SELECT_IS_WINSOCKET
		235	# include <winsock.h>
		236	#endif
		237
		238	/**/
		239
		240	/*
		241	* This is used to avoid floating point rounding problems.
		242	* It is added to ev_rt_now when scheduling periodics
		243	* to ensure progress, time-wise, even when rounding
		244	* errors are against us.
		245	* This value is good at least till the year 4000.
		246	* Better solutions welcome.
		247	*/
		248	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18		249
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	250	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	251	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		252	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21		253
		254	#if __GNUC__ >= 4
		255	# define expect(expr,value) __builtin_expect ((expr),(value))
		256	# define noinline __attribute__ ((noinline))
		257	#else
		258	# define expect(expr,value) (expr)
		259	# define noinline
		260	# if __STDC_VERSION__ < 199901L
		261	# define inline
		262	# endif
		263	#endif
		264
		265	#define expect_false(expr) expect ((expr) != 0, 0)
		266	#define expect_true(expr) expect ((expr) != 0, 1)
		267	#define inline_size static inline
		268
		269	#if EV_MINIMAL
		270	# define inline_speed static noinline
		271	#else
		272	# define inline_speed static inline
		273	#endif
		274
		275	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		276	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		277
		278	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		279	#define EMPTY2(a,b) /* used to suppress some warnings */
		280
		281	typedef ev_watcher *W;
		282	typedef ev_watcher_list *WL;
		283	typedef ev_watcher_time *WT;
		284
		285	/* sig_atomic_t is used to avoid per-thread variables or locking but still */
		286	/* giving it a reasonably high chance of working on typical architetcures */
		287	static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		288
		289	#ifdef _WIN32
		290	# include "ev_win32.c"
		291	#endif
		292
		293	/*****************************************************************************/
		294
		295	static void (*syserr_cb)(const char *msg);
		296
		297	void
		298	ev_set_syserr_cb (void (*cb)(const char *msg))
		299	{
		300	syserr_cb = cb;
		301	}
		302
		303	static void noinline
		304	syserr (const char *msg)
		305	{
		306	if (!msg)
		307	msg = "(libev) system error";
		308
		309	if (syserr_cb)
		310	syserr_cb (msg);
		311	else
		312	{
		313	perror (msg);
		314	abort ();
		315	}
		316	}
		317
		318	static void *(*alloc)(void *ptr, long size);
		319
		320	void
		321	ev_set_allocator (void *(*cb)(void *ptr, long size))
		322	{
		323	alloc = cb;
		324	}
		325
		326	inline_speed void *
		327	ev_realloc (void *ptr, long size)
		328	{
		329	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		330
		331	if (!ptr && size)
		332	{
		333	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		334	abort ();
		335	}
		336
		337	return ptr;
		338	}
		339
		340	#define ev_malloc(size) ev_realloc (0, (size))
		341	#define ev_free(ptr) ev_realloc ((ptr), 0)
		342
		343	/*****************************************************************************/
		344
		345	typedef struct
		346	{
		347	WL head;
		348	unsigned char events;
		349	unsigned char reify;
		350	#if EV_SELECT_IS_WINSOCKET
		351	SOCKET handle;
		352	#endif
		353	} ANFD;
		354
		355	typedef struct
		356	{
		357	W w;
		358	int events;
		359	} ANPENDING;
		360
		361	#if EV_USE_INOTIFY
		362	typedef struct
		363	{
		364	WL head;
		365	} ANFS;
		366	#endif
		367
		368	#if EV_MULTIPLICITY
		369
		370	struct ev_loop
		371	{
		372	ev_tstamp ev_rt_now;
		373	#define ev_rt_now ((loop)->ev_rt_now)
		374	#define VAR(name,decl) decl;
		375	#include "ev_vars.h"
		376	#undef VAR
		377	};
22	#include "ev.h"	378	#include "ev_wrap.h"
23		379
24	struct ev_watcher {	380	static struct ev_loop default_loop_struct;
25	EV_WATCHER (ev_watcher);	381	struct ev_loop *ev_default_loop_ptr;
26	};
27		382
28	struct ev_watcher_list {	383	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		384
32	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	385	ev_tstamp ev_rt_now;
34	int ev_method;	386	#define VAR(name,decl) static decl;
		387	#include "ev_vars.h"
		388	#undef VAR
35		389
36	static int have_monotonic; /* runtime */	390	static int ev_default_loop_ptr;
37		391
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	392	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	393
40	static void (*method_poll)(ev_tstamp timeout);	394	/*****************************************************************************/
41		395
42	ev_tstamp	396	ev_tstamp
43	ev_time (void)	397	ev_time (void)
44	{	398	{
45	#if HAVE_REALTIME	399	#if EV_USE_REALTIME
46	struct timespec ts;	400	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	401	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	402	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	403	#else
50	struct timeval tv;	404	struct timeval tv;
51	gettimeofday (&tv, 0);	405	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	406	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	407	#endif
54	}	408	}
55		409
56	static ev_tstamp	410	ev_tstamp inline_size
57	get_clock (void)	411	get_clock (void)
58	{	412	{
59	#if HAVE_MONOTONIC	413	#if EV_USE_MONOTONIC
60	if (have_monotonic)	414	if (expect_true (have_monotonic))
61	{	415	{
62	struct timespec ts;	416	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	417	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	418	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	419	}
66	#endif	420	#endif
67		421
68	return ev_time ();	422	return ev_time ();
69	}	423	}
70		424
		425	#if EV_MULTIPLICITY
		426	ev_tstamp
		427	ev_now (EV_P)
		428	{
		429	return ev_rt_now;
		430	}
		431	#endif
		432
		433	void
		434	ev_sleep (ev_tstamp delay)
		435	{
		436	if (delay > 0.)
		437	{
		438	#if EV_USE_NANOSLEEP
		439	struct timespec ts;
		440
		441	ts.tv_sec = (time_t)delay;
		442	ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
		443
		444	nanosleep (&ts, 0);
		445	#elif defined(_WIN32)
		446	Sleep (delay * 1e3);
		447	#else
		448	struct timeval tv;
		449
		450	tv.tv_sec = (time_t)delay;
		451	tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
		452
		453	select (0, 0, 0, 0, &tv);
		454	#endif
		455	}
		456	}
		457
		458	/*****************************************************************************/
		459
		460	int inline_size
		461	array_nextsize (int elem, int cur, int cnt)
		462	{
		463	int ncur = cur + 1;
		464
		465	do
		466	ncur <<= 1;
		467	while (cnt > ncur);
		468
		469	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		470	if (elem * ncur > 4096)
		471	{
		472	ncur *= elem;
		473	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		474	ncur = ncur - sizeof (void *) * 4;
		475	ncur /= elem;
		476	}
		477
		478	return ncur;
		479	}
		480
		481	static noinline void *
		482	array_realloc (int elem, void *base, int *cur, int cnt)
		483	{
		484	*cur = array_nextsize (elem, *cur, cnt);
		485	return ev_realloc (base, elem * *cur);
		486	}
		487
71	#define array_needsize(base,cur,cnt,init) \	488	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	489	if (expect_false ((cnt) > (cur))) \
73	{ \	490	{ \
74	int newcnt = cur ? cur << 1 : 16; \	491	int ocur_ = (cur); \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	492	(base) = (type *)array_realloc \
76	base = realloc (base, sizeof (*base) * (newcnt)); \	493	(sizeof (type), (base), &(cur), (cnt)); \
77	init (base + cur, newcnt - cur); \	494	init ((base) + (ocur_), (cur) - ocur_); \
78	cur = newcnt; \	495	}
		496
		497	#if 0
		498	#define array_slim(type,stem) \
		499	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		500	{ \
		501	stem ## max = array_roundsize (stem ## cnt >> 1); \
		502	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		503	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		504	}
		505	#endif
		506
		507	#define array_free(stem, idx) \
		508	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		509
		510	/*****************************************************************************/
		511
		512	void noinline
		513	ev_feed_event (EV_P_ void *w, int revents)
		514	{
		515	W w_ = (W)w;
		516	int pri = ABSPRI (w_);
		517
		518	if (expect_false (w_->pending))
		519	pendings [pri][w_->pending - 1].events |= revents;
		520	else
79	}	521	{
		522	w_->pending = ++pendingcnt [pri];
		523	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		524	pendings [pri][w_->pending - 1].w = w_;
		525	pendings [pri][w_->pending - 1].events = revents;
		526	}
		527	}
80		528
81	typedef struct	529	void inline_speed
		530	queue_events (EV_P_ W *events, int eventcnt, int type)
82	{	531	{
83	struct ev_io *head;	532	int i;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86		533
87	static ANFD *anfds;	534	for (i = 0; i < eventcnt; ++i)
88	static int anfdmax;	535	ev_feed_event (EV_A_ events [i], type);
		536	}
89		537
90	static int *fdchanges;	538	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		539
93	static void	540	void inline_size
94	anfds_init (ANFD *base, int count)	541	anfds_init (ANFD *base, int count)
95	{	542	{
96	while (count--)	543	while (count--)
97	{	544	{
98	base->head = 0;	545	base->head = 0;
99	base->wev = base->rev = EV_NONE;	546	base->events = EV_NONE;
		547	base->reify = 0;
		548
100	++base;	549	++base;
101	}	550	}
102	}	551	}
103		552
104	typedef struct	553	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)	554	fd_event (EV_P_ int fd, int revents)
124	{	555	{
125	ANFD *anfd = anfds + fd;	556	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	557	ev_io *w;
127		558
128	for (w = anfd->head; w; w = w->next)	559	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129	{	560	{
130	int ev = w->events & events;	561	int ev = w->events & revents;
131		562
132	if (ev)	563	if (ev)
133	event ((struct ev_watcher *)w, ev);	564	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	{	565	}
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	}	566	}
159		567
160	static void	568	void
161	downheap (struct ev_timer **timers, int N, int k)	569	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	570	{
163	struct ev_timer *w = timers [k];	571	if (fd >= 0 && fd < anfdmax)
164		572	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	}	573	}
183		574
184	static struct ev_signal **signals;	575	void inline_size
185	static int signalmax;	576	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	{	577	{
247	int i;	578	int i;
248		579
249	for (i = 0; i < fdchangecnt; ++i)	580	for (i = 0; i < fdchangecnt; ++i)
250	{	581	{
251	int fd = fdchanges [i];	582	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	583	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	584	ev_io *w;
254		585
255	int wev = 0;	586	unsigned char events = 0;
256		587
257	for (w = anfd->head; w; w = w->next)	588	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
258	wev |= w->events;	589	events |= (unsigned char)w->events;
259		590
260	if (anfd->wev != wev)	591	#if EV_SELECT_IS_WINSOCKET
		592	if (events)
261	{	593	{
262	method_modify (fd, anfd->wev, wev);	594	unsigned long argp;
263	anfd->wev = wev;	595	anfd->handle = _get_osfhandle (fd);
		596	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	597	}
		598	#endif
		599
		600	{
		601	unsigned char o_events = anfd->events;
		602	unsigned char o_reify = anfd->reify;
		603
		604	anfd->reify = 0;
		605	anfd->events = events;
		606
		607	if (o_events != events || o_reify & EV_IOFDSET)
		608	backend_modify (EV_A_ fd, o_events, events);
		609	}
265	}	610	}
266		611
267	fdchangecnt = 0;	612	fdchangecnt = 0;
268	}	613	}
269		614
		615	void inline_size
		616	fd_change (EV_P_ int fd, int flags)
		617	{
		618	unsigned char reify = anfds [fd].reify;
		619	anfds [fd].reify |= flags;
		620
		621	if (expect_true (!reify))
		622	{
		623	++fdchangecnt;
		624	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		625	fdchanges [fdchangecnt - 1] = fd;
		626	}
		627	}
		628
		629	void inline_speed
		630	fd_kill (EV_P_ int fd)
		631	{
		632	ev_io *w;
		633
		634	while ((w = (ev_io *)anfds [fd].head))
		635	{
		636	ev_io_stop (EV_A_ w);
		637	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		638	}
		639	}
		640
		641	int inline_size
		642	fd_valid (int fd)
		643	{
		644	#ifdef _WIN32
		645	return _get_osfhandle (fd) != -1;
		646	#else
		647	return fcntl (fd, F_GETFD) != -1;
		648	#endif
		649	}
		650
		651	/* called on EBADF to verify fds */
		652	static void noinline
		653	fd_ebadf (EV_P)
		654	{
		655	int fd;
		656
		657	for (fd = 0; fd < anfdmax; ++fd)
		658	if (anfds [fd].events)
		659	if (!fd_valid (fd) == -1 && errno == EBADF)
		660	fd_kill (EV_A_ fd);
		661	}
		662
		663	/* called on ENOMEM in select/poll to kill some fds and retry */
		664	static void noinline
		665	fd_enomem (EV_P)
		666	{
		667	int fd;
		668
		669	for (fd = anfdmax; fd--; )
		670	if (anfds [fd].events)
		671	{
		672	fd_kill (EV_A_ fd);
		673	return;
		674	}
		675	}
		676
		677	/* usually called after fork if backend needs to re-arm all fds from scratch */
		678	static void noinline
		679	fd_rearm_all (EV_P)
		680	{
		681	int fd;
		682
		683	for (fd = 0; fd < anfdmax; ++fd)
		684	if (anfds [fd].events)
		685	{
		686	anfds [fd].events = 0;
		687	fd_change (EV_A_ fd, EV_IOFDSET | 1);
		688	}
		689	}
		690
		691	/*****************************************************************************/
		692
		693	void inline_speed
		694	upheap (WT *heap, int k)
		695	{
		696	WT w = heap [k];
		697
		698	while (k)
		699	{
		700	int p = (k - 1) >> 1;
		701
		702	if (heap [p]->at <= w->at)
		703	break;
		704
		705	heap [k] = heap [p];
		706	((W)heap [k])->active = k + 1;
		707	k = p;
		708	}
		709
		710	heap [k] = w;
		711	((W)heap [k])->active = k + 1;
		712	}
		713
		714	void inline_speed
		715	downheap (WT *heap, int N, int k)
		716	{
		717	WT w = heap [k];
		718
		719	for (;;)
		720	{
		721	int c = (k << 1) + 1;
		722
		723	if (c >= N)
		724	break;
		725
		726	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		727	? 1 : 0;
		728
		729	if (w->at <= heap [c]->at)
		730	break;
		731
		732	heap [k] = heap [c];
		733	((W)heap [k])->active = k + 1;
		734
		735	k = c;
		736	}
		737
		738	heap [k] = w;
		739	((W)heap [k])->active = k + 1;
		740	}
		741
		742	void inline_size
		743	adjustheap (WT *heap, int N, int k)
		744	{
		745	upheap (heap, k);
		746	downheap (heap, N, k);
		747	}
		748
		749	/*****************************************************************************/
		750
		751	typedef struct
		752	{
		753	WL head;
		754	sig_atomic_t volatile gotsig;
		755	} ANSIG;
		756
		757	static ANSIG *signals;
		758	static int signalmax;
		759
		760	static int sigpipe [2];
		761	static sig_atomic_t volatile gotsig;
		762	static ev_io sigev;
		763
		764	void inline_size
		765	signals_init (ANSIG *base, int count)
		766	{
		767	while (count--)
		768	{
		769	base->head = 0;
		770	base->gotsig = 0;
		771
		772	++base;
		773	}
		774	}
		775
270	static void	776	static void
271	call_pending ()	777	sighandler (int signum)
		778	{
		779	#if _WIN32
		780	signal (signum, sighandler);
		781	#endif
		782
		783	signals [signum - 1].gotsig = 1;
		784
		785	if (!gotsig)
		786	{
		787	int old_errno = errno;
		788	gotsig = 1;
		789	write (sigpipe [1], &signum, 1);
		790	errno = old_errno;
		791	}
		792	}
		793
		794	void noinline
		795	ev_feed_signal_event (EV_P_ int signum)
		796	{
		797	WL w;
		798
		799	#if EV_MULTIPLICITY
		800	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		801	#endif
		802
		803	--signum;
		804
		805	if (signum < 0 || signum >= signalmax)
		806	return;
		807
		808	signals [signum].gotsig = 0;
		809
		810	for (w = signals [signum].head; w; w = w->next)
		811	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		812	}
		813
		814	static void
		815	sigcb (EV_P_ ev_io *iow, int revents)
		816	{
		817	int signum;
		818
		819	read (sigpipe [0], &revents, 1);
		820	gotsig = 0;
		821
		822	for (signum = signalmax; signum--; )
		823	if (signals [signum].gotsig)
		824	ev_feed_signal_event (EV_A_ signum + 1);
		825	}
		826
		827	void inline_speed
		828	fd_intern (int fd)
		829	{
		830	#ifdef _WIN32
		831	int arg = 1;
		832	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		833	#else
		834	fcntl (fd, F_SETFD, FD_CLOEXEC);
		835	fcntl (fd, F_SETFL, O_NONBLOCK);
		836	#endif
		837	}
		838
		839	static void noinline
		840	siginit (EV_P)
		841	{
		842	fd_intern (sigpipe [0]);
		843	fd_intern (sigpipe [1]);
		844
		845	ev_io_set (&sigev, sigpipe [0], EV_READ);
		846	ev_io_start (EV_A_ &sigev);
		847	ev_unref (EV_A); /* child watcher should not keep loop alive */
		848	}
		849
		850	/*****************************************************************************/
		851
		852	static WL childs [EV_PID_HASHSIZE];
		853
		854	#ifndef _WIN32
		855
		856	static ev_signal childev;
		857
		858	void inline_speed
		859	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		860	{
		861	ev_child *w;
		862
		863	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		864	if (w->pid == pid || !w->pid)
		865	{
		866	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
		867	w->rpid = pid;
		868	w->rstatus = status;
		869	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		870	}
		871	}
		872
		873	#ifndef WCONTINUED
		874	# define WCONTINUED 0
		875	#endif
		876
		877	static void
		878	childcb (EV_P_ ev_signal *sw, int revents)
		879	{
		880	int pid, status;
		881
		882	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
		883	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		884	if (!WCONTINUED
		885	|| errno != EINVAL
		886	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		887	return;
		888
		889	/* make sure we are called again until all childs have been reaped */
		890	/* we need to do it this way so that the callback gets called before we continue */
		891	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		892
		893	child_reap (EV_A_ sw, pid, pid, status);
		894	if (EV_PID_HASHSIZE > 1)
		895	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		896	}
		897
		898	#endif
		899
		900	/*****************************************************************************/
		901
		902	#if EV_USE_PORT
		903	# include "ev_port.c"
		904	#endif
		905	#if EV_USE_KQUEUE
		906	# include "ev_kqueue.c"
		907	#endif
		908	#if EV_USE_EPOLL
		909	# include "ev_epoll.c"
		910	#endif
		911	#if EV_USE_POLL
		912	# include "ev_poll.c"
		913	#endif
		914	#if EV_USE_SELECT
		915	# include "ev_select.c"
		916	#endif
		917
		918	int
		919	ev_version_major (void)
		920	{
		921	return EV_VERSION_MAJOR;
		922	}
		923
		924	int
		925	ev_version_minor (void)
		926	{
		927	return EV_VERSION_MINOR;
		928	}
		929
		930	/* return true if we are running with elevated privileges and should ignore env variables */
		931	int inline_size
		932	enable_secure (void)
		933	{
		934	#ifdef _WIN32
		935	return 0;
		936	#else
		937	return getuid () != geteuid ()
		938	|| getgid () != getegid ();
		939	#endif
		940	}
		941
		942	unsigned int
		943	ev_supported_backends (void)
		944	{
		945	unsigned int flags = 0;
		946
		947	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		948	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		949	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		950	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		951	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		952
		953	return flags;
		954	}
		955
		956	unsigned int
		957	ev_recommended_backends (void)
		958	{
		959	unsigned int flags = ev_supported_backends ();
		960
		961	#ifndef __NetBSD__
		962	/* kqueue is borked on everything but netbsd apparently */
		963	/* it usually doesn't work correctly on anything but sockets and pipes */
		964	flags &= ~EVBACKEND_KQUEUE;
		965	#endif
		966	#ifdef __APPLE__
		967	// flags &= ~EVBACKEND_KQUEUE; for documentation
		968	flags &= ~EVBACKEND_POLL;
		969	#endif
		970
		971	return flags;
		972	}
		973
		974	unsigned int
		975	ev_embeddable_backends (void)
		976	{
		977	int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
		978
		979	/* epoll embeddability broken on all linux versions up to at least 2.6.23 */
		980	/* please fix it and tell me how to detect the fix */
		981	flags &= ~EVBACKEND_EPOLL;
		982
		983	#ifdef __APPLE__
		984	/* is there anything thats not broken on darwin? */
		985	flags &= ~EVBACKEND_KQUEUE;
		986	#endif
		987
		988	return flags;
		989	}
		990
		991	unsigned int
		992	ev_backend (EV_P)
		993	{
		994	return backend;
		995	}
		996
		997	unsigned int
		998	ev_loop_count (EV_P)
		999	{
		1000	return loop_count;
		1001	}
		1002
		1003	void
		1004	ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
		1005	{
		1006	io_blocktime = interval;
		1007	}
		1008
		1009	void
		1010	ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
		1011	{
		1012	timeout_blocktime = interval;
		1013	}
		1014
		1015	static void noinline
		1016	loop_init (EV_P_ unsigned int flags)
		1017	{
		1018	if (!backend)
		1019	{
		1020	#if EV_USE_MONOTONIC
		1021	{
		1022	struct timespec ts;
		1023	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		1024	have_monotonic = 1;
		1025	}
		1026	#endif
		1027
		1028	ev_rt_now = ev_time ();
		1029	mn_now = get_clock ();
		1030	now_floor = mn_now;
		1031	rtmn_diff = ev_rt_now - mn_now;
		1032
		1033	io_blocktime = 0.;
		1034	timeout_blocktime = 0.;
		1035
		1036	/* pid check not overridable via env */
		1037	#ifndef _WIN32
		1038	if (flags & EVFLAG_FORKCHECK)
		1039	curpid = getpid ();
		1040	#endif
		1041
		1042	if (!(flags & EVFLAG_NOENV)
		1043	&& !enable_secure ()
		1044	&& getenv ("LIBEV_FLAGS"))
		1045	flags = atoi (getenv ("LIBEV_FLAGS"));
		1046
		1047	if (!(flags & 0x0000ffffUL))
		1048	flags |= ev_recommended_backends ();
		1049
		1050	backend = 0;
		1051	backend_fd = -1;
		1052	#if EV_USE_INOTIFY
		1053	fs_fd = -2;
		1054	#endif
		1055
		1056	#if EV_USE_PORT
		1057	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		1058	#endif
		1059	#if EV_USE_KQUEUE
		1060	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		1061	#endif
		1062	#if EV_USE_EPOLL
		1063	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		1064	#endif
		1065	#if EV_USE_POLL
		1066	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		1067	#endif
		1068	#if EV_USE_SELECT
		1069	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		1070	#endif
		1071
		1072	ev_init (&sigev, sigcb);
		1073	ev_set_priority (&sigev, EV_MAXPRI);
		1074	}
		1075	}
		1076
		1077	static void noinline
		1078	loop_destroy (EV_P)
272	{	1079	{
273	int i;	1080	int i;
274		1081
275	for (i = 0; i < pendingcnt; ++i)	1082	#if EV_USE_INOTIFY
		1083	if (fs_fd >= 0)
		1084	close (fs_fd);
		1085	#endif
		1086
		1087	if (backend_fd >= 0)
		1088	close (backend_fd);
		1089
		1090	#if EV_USE_PORT
		1091	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1092	#endif
		1093	#if EV_USE_KQUEUE
		1094	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1095	#endif
		1096	#if EV_USE_EPOLL
		1097	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1098	#endif
		1099	#if EV_USE_POLL
		1100	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1101	#endif
		1102	#if EV_USE_SELECT
		1103	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1104	#endif
		1105
		1106	for (i = NUMPRI; i--; )
		1107	{
		1108	array_free (pending, [i]);
		1109	#if EV_IDLE_ENABLE
		1110	array_free (idle, [i]);
		1111	#endif
276	{	1112	}
277	ANPENDING *p = pendings + i;
278		1113
279	if (p->w)	1114	ev_free (anfds); anfdmax = 0;
		1115
		1116	/* have to use the microsoft-never-gets-it-right macro */
		1117	array_free (fdchange, EMPTY);
		1118	array_free (timer, EMPTY);
		1119	#if EV_PERIODIC_ENABLE
		1120	array_free (periodic, EMPTY);
		1121	#endif
		1122	#if EV_FORK_ENABLE
		1123	array_free (fork, EMPTY);
		1124	#endif
		1125	array_free (prepare, EMPTY);
		1126	array_free (check, EMPTY);
		1127
		1128	backend = 0;
		1129	}
		1130
		1131	void inline_size infy_fork (EV_P);
		1132
		1133	void inline_size
		1134	loop_fork (EV_P)
		1135	{
		1136	#if EV_USE_PORT
		1137	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1138	#endif
		1139	#if EV_USE_KQUEUE
		1140	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1141	#endif
		1142	#if EV_USE_EPOLL
		1143	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1144	#endif
		1145	#if EV_USE_INOTIFY
		1146	infy_fork (EV_A);
		1147	#endif
		1148
		1149	if (ev_is_active (&sigev))
		1150	{
		1151	/* default loop */
		1152
		1153	ev_ref (EV_A);
		1154	ev_io_stop (EV_A_ &sigev);
		1155	close (sigpipe [0]);
		1156	close (sigpipe [1]);
		1157
		1158	while (pipe (sigpipe))
		1159	syserr ("(libev) error creating pipe");
		1160
		1161	siginit (EV_A);
		1162	}
		1163
		1164	postfork = 0;
		1165	}
		1166
		1167	#if EV_MULTIPLICITY
		1168	struct ev_loop *
		1169	ev_loop_new (unsigned int flags)
		1170	{
		1171	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1172
		1173	memset (loop, 0, sizeof (struct ev_loop));
		1174
		1175	loop_init (EV_A_ flags);
		1176
		1177	if (ev_backend (EV_A))
		1178	return loop;
		1179
		1180	return 0;
		1181	}
		1182
		1183	void
		1184	ev_loop_destroy (EV_P)
		1185	{
		1186	loop_destroy (EV_A);
		1187	ev_free (loop);
		1188	}
		1189
		1190	void
		1191	ev_loop_fork (EV_P)
		1192	{
		1193	postfork = 1;
		1194	}
		1195
		1196	#endif
		1197
		1198	#if EV_MULTIPLICITY
		1199	struct ev_loop *
		1200	ev_default_loop_init (unsigned int flags)
		1201	#else
		1202	int
		1203	ev_default_loop (unsigned int flags)
		1204	#endif
		1205	{
		1206	if (sigpipe [0] == sigpipe [1])
		1207	if (pipe (sigpipe))
		1208	return 0;
		1209
		1210	if (!ev_default_loop_ptr)
		1211	{
		1212	#if EV_MULTIPLICITY
		1213	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1214	#else
		1215	ev_default_loop_ptr = 1;
		1216	#endif
		1217
		1218	loop_init (EV_A_ flags);
		1219
		1220	if (ev_backend (EV_A))
280	{	1221	{
281	p->w->pending = 0;	1222	siginit (EV_A);
282	p->w->cb (p->w, p->events);	1223
		1224	#ifndef _WIN32
		1225	ev_signal_init (&childev, childcb, SIGCHLD);
		1226	ev_set_priority (&childev, EV_MAXPRI);
		1227	ev_signal_start (EV_A_ &childev);
		1228	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1229	#endif
283	}	1230	}
		1231	else
		1232	ev_default_loop_ptr = 0;
		1233	}
		1234
		1235	return ev_default_loop_ptr;
		1236	}
		1237
		1238	void
		1239	ev_default_destroy (void)
		1240	{
		1241	#if EV_MULTIPLICITY
		1242	struct ev_loop *loop = ev_default_loop_ptr;
		1243	#endif
		1244
		1245	#ifndef _WIN32
		1246	ev_ref (EV_A); /* child watcher */
		1247	ev_signal_stop (EV_A_ &childev);
		1248	#endif
		1249
		1250	ev_ref (EV_A); /* signal watcher */
		1251	ev_io_stop (EV_A_ &sigev);
		1252
		1253	close (sigpipe [0]); sigpipe [0] = 0;
		1254	close (sigpipe [1]); sigpipe [1] = 0;
		1255
		1256	loop_destroy (EV_A);
		1257	}
		1258
		1259	void
		1260	ev_default_fork (void)
		1261	{
		1262	#if EV_MULTIPLICITY
		1263	struct ev_loop *loop = ev_default_loop_ptr;
		1264	#endif
		1265
		1266	if (backend)
		1267	postfork = 1;
		1268	}
		1269
		1270	/*****************************************************************************/
		1271
		1272	void
		1273	ev_invoke (EV_P_ void *w, int revents)
		1274	{
		1275	EV_CB_INVOKE ((W)w, revents);
		1276	}
		1277
		1278	void inline_speed
		1279	call_pending (EV_P)
		1280	{
		1281	int pri;
		1282
		1283	for (pri = NUMPRI; pri--; )
		1284	while (pendingcnt [pri])
		1285	{
		1286	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1287
		1288	if (expect_true (p->w))
		1289	{
		1290	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1291
		1292	p->w->pending = 0;
		1293	EV_CB_INVOKE (p->w, p->events);
		1294	}
284	}	1295	}
285
286	pendingcnt = 0;
287	}	1296	}
288		1297
289	static void	1298	void inline_size
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1299	timers_reify (EV_P)
291	{	1300	{
292	while (timercnt && timers [0]->at <= now)	1301	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1302	{
294	struct ev_timer *w = timers [0];	1303	ev_timer *w = (ev_timer *)timers [0];
		1304
		1305	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
295		1306
296	/* first reschedule or stop timer */	1307	/* first reschedule or stop timer */
297	if (w->repeat)	1308	if (w->repeat)
298	{	1309	{
299	if (w->is_abs)	1310	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;	1311
301	else
302	w->at = now + w->repeat;	1312	((WT)w)->at += w->repeat;
303		1313	if (((WT)w)->at < mn_now)
304	assert (w->at > now);	1314	((WT)w)->at = mn_now;
305		1315
306	downheap (timers, timercnt, 0);	1316	downheap (timers, timercnt, 0);
307	}	1317	}
308	else	1318	else
		1319	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1320
		1321	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1322	}
		1323	}
		1324
		1325	#if EV_PERIODIC_ENABLE
		1326	void inline_size
		1327	periodics_reify (EV_P)
		1328	{
		1329	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1330	{
		1331	ev_periodic *w = (ev_periodic *)periodics [0];
		1332
		1333	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1334
		1335	/* first reschedule or stop timer */
		1336	if (w->reschedule_cb)
309	{	1337	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1338	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
311	--timercnt; /* maybe pass by reference instead? */	1339	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1340	downheap (periodics, periodiccnt, 0);
312	}	1341	}
		1342	else if (w->interval)
		1343	{
		1344	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1345	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1346	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1347	downheap (periodics, periodiccnt, 0);
		1348	}
		1349	else
		1350	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1351
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1352	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1353	}
316	}	1354	}
317		1355
318	static void	1356	static void noinline
319	time_update ()	1357	periodics_reschedule (EV_P)
320	{	1358	{
321	int i;	1359	int i;
322	ev_now = ev_time ();
323		1360
324	if (have_monotonic)	1361	/* adjust periodics after time jump */
		1362	for (i = 0; i < periodiccnt; ++i)
		1363	{
		1364	ev_periodic *w = (ev_periodic *)periodics [i];
		1365
		1366	if (w->reschedule_cb)
		1367	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1368	else if (w->interval)
		1369	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
325	{	1370	}
326	ev_tstamp odiff = diff;
327		1371
328	/* detecting time jumps is much more difficult */	1372	/* now rebuild the heap */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1373	for (i = periodiccnt >> 1; i--; )
		1374	downheap (periodics, periodiccnt, i);
		1375	}
		1376	#endif
		1377
		1378	#if EV_IDLE_ENABLE
		1379	void inline_size
		1380	idle_reify (EV_P)
		1381	{
		1382	if (expect_false (idleall))
		1383	{
		1384	int pri;
		1385
		1386	for (pri = NUMPRI; pri--; )
330	{	1387	{
		1388	if (pendingcnt [pri])
		1389	break;
		1390
		1391	if (idlecnt [pri])
		1392	{
		1393	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1394	break;
		1395	}
		1396	}
		1397	}
		1398	}
		1399	#endif
		1400
		1401	void inline_speed
		1402	time_update (EV_P_ ev_tstamp max_block)
		1403	{
		1404	int i;
		1405
		1406	#if EV_USE_MONOTONIC
		1407	if (expect_true (have_monotonic))
		1408	{
		1409	ev_tstamp odiff = rtmn_diff;
		1410
331	now = get_clock ();	1411	mn_now = get_clock ();
		1412
		1413	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1414	/* interpolate in the meantime */
		1415	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1416	{
		1417	ev_rt_now = rtmn_diff + mn_now;
		1418	return;
		1419	}
		1420
		1421	now_floor = mn_now;
		1422	ev_rt_now = ev_time ();
		1423
		1424	/* loop a few times, before making important decisions.
		1425	* on the choice of "4": one iteration isn't enough,
		1426	* in case we get preempted during the calls to
		1427	* ev_time and get_clock. a second call is almost guaranteed
		1428	* to succeed in that case, though. and looping a few more times
		1429	* doesn't hurt either as we only do this on time-jumps or
		1430	* in the unlikely event of having been preempted here.
		1431	*/
		1432	for (i = 4; --i; )
		1433	{
332	diff = ev_now - now;	1434	rtmn_diff = ev_rt_now - mn_now;
333		1435
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1436	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1437	return; /* all is well */
336		1438
337	ev_now = ev_time ();	1439	ev_rt_now = ev_time ();
		1440	mn_now = get_clock ();
		1441	now_floor = mn_now;
338	}	1442	}
339		1443
340	/* time jump detected, reschedule atimers */	1444	# if EV_PERIODIC_ENABLE
341	for (i = 0; i < atimercnt; ++i)	1445	periodics_reschedule (EV_A);
		1446	# endif
		1447	/* no timer adjustment, as the monotonic clock doesn't jump */
		1448	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1449	}
		1450	else
		1451	#endif
		1452	{
		1453	ev_rt_now = ev_time ();
		1454
		1455	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
342	{	1456	{
343	struct ev_timer *w = atimers [i];	1457	#if EV_PERIODIC_ENABLE
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1458	periodics_reschedule (EV_A);
		1459	#endif
		1460	/* adjust timers. this is easy, as the offset is the same for all of them */
		1461	for (i = 0; i < timercnt; ++i)
		1462	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1463	}
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		1464
354	now = ev_now;	1465	mn_now = ev_rt_now;
355	}	1466	}
356	}	1467	}
357		1468
358	int ev_loop_done;	1469	void
		1470	ev_ref (EV_P)
		1471	{
		1472	++activecnt;
		1473	}
359		1474
		1475	void
		1476	ev_unref (EV_P)
		1477	{
		1478	--activecnt;
		1479	}
		1480
		1481	static int loop_done;
		1482
		1483	void
360	void ev_loop (int flags)	1484	ev_loop (EV_P_ int flags)
361	{	1485	{
362	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1486	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1487	? EVUNLOOP_ONE
		1488	: EVUNLOOP_CANCEL;
		1489
		1490	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
364		1491
365	do	1492	do
366	{	1493	{
		1494	#ifndef _WIN32
		1495	if (expect_false (curpid)) /* penalise the forking check even more */
		1496	if (expect_false (getpid () != curpid))
		1497	{
		1498	curpid = getpid ();
		1499	postfork = 1;
		1500	}
		1501	#endif
		1502
		1503	#if EV_FORK_ENABLE
		1504	/* we might have forked, so queue fork handlers */
		1505	if (expect_false (postfork))
		1506	if (forkcnt)
		1507	{
		1508	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1509	call_pending (EV_A);
		1510	}
		1511	#endif
		1512
		1513	/* queue prepare watchers (and execute them) */
		1514	if (expect_false (preparecnt))
		1515	{
		1516	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1517	call_pending (EV_A);
		1518	}
		1519
		1520	if (expect_false (!activecnt))
		1521	break;
		1522
		1523	/* we might have forked, so reify kernel state if necessary */
		1524	if (expect_false (postfork))
		1525	loop_fork (EV_A);
		1526
367	/* update fd-related kernel structures */	1527	/* update fd-related kernel structures */
368	fd_reify ();	1528	fd_reify (EV_A);
369		1529
370	/* calculate blocking time */	1530	/* calculate blocking time */
371	if (flags & EVLOOP_NONBLOCK)	1531	{
372	block = 0.;	1532	ev_tstamp waittime = 0.;
373	else	1533	ev_tstamp sleeptime = 0.;
		1534
		1535	if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
374	{	1536	{
		1537	/* update time to cancel out callback processing overhead */
		1538	time_update (EV_A_ 1e100);
		1539
375	block = MAX_BLOCKTIME;	1540	waittime = MAX_BLOCKTIME;
376		1541
377	if (rtimercnt)	1542	if (timercnt)
378	{	1543	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1544	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1545	if (waittime > to) waittime = to;
381	}	1546	}
382		1547
		1548	#if EV_PERIODIC_ENABLE
383	if (atimercnt)	1549	if (periodiccnt)
384	{	1550	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1551	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1552	if (waittime > to) waittime = to;
387	}	1553	}
		1554	#endif
388		1555
389	if (block < 0.) block = 0.;	1556	if (expect_false (waittime < timeout_blocktime))
		1557	waittime = timeout_blocktime;
		1558
		1559	sleeptime = waittime - backend_fudge;
		1560
		1561	if (expect_true (sleeptime > io_blocktime))
		1562	sleeptime = io_blocktime;
		1563
		1564	if (sleeptime)
		1565	{
		1566	ev_sleep (sleeptime);
		1567	waittime -= sleeptime;
		1568	}
390	}	1569	}
391		1570
392	method_poll (block);	1571	++loop_count;
		1572	backend_poll (EV_A_ waittime);
393		1573
394	/* update ev_now, do magic */	1574	/* update ev_rt_now, do magic */
395	time_update ();	1575	time_update (EV_A_ waittime + sleeptime);
		1576	}
396		1577
397	/* put pending timers into pendign queue and reschedule them */	1578	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1579	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1580	#if EV_PERIODIC_ENABLE
400	/* relative timers second */	1581	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1582	#endif
402		1583
		1584	#if EV_IDLE_ENABLE
		1585	/* queue idle watchers unless other events are pending */
		1586	idle_reify (EV_A);
		1587	#endif
		1588
		1589	/* queue check watchers, to be executed first */
		1590	if (expect_false (checkcnt))
		1591	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1592
403	call_pending ();	1593	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1594
408	static void	1595	}
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1596	while (expect_true (activecnt && !loop_done));
		1597
		1598	if (loop_done == EVUNLOOP_ONE)
		1599	loop_done = EVUNLOOP_CANCEL;
		1600	}
		1601
		1602	void
		1603	ev_unloop (EV_P_ int how)
		1604	{
		1605	loop_done = how;
		1606	}
		1607
		1608	/*****************************************************************************/
		1609
		1610	void inline_size
		1611	wlist_add (WL *head, WL elem)
410	{	1612	{
411	elem->next = *head;	1613	elem->next = *head;
412	*head = elem;	1614	*head = elem;
413	}	1615	}
414		1616
415	static void	1617	void inline_size
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1618	wlist_del (WL *head, WL elem)
417	{	1619	{
418	while (*head)	1620	while (*head)
419	{	1621	{
420	if (*head == elem)	1622	if (*head == elem)
421	{	1623	{
…		…
425		1627
426	head = &(*head)->next;	1628	head = &(*head)->next;
427	}	1629	}
428	}	1630	}
429		1631
		1632	void inline_speed
		1633	clear_pending (EV_P_ W w)
		1634	{
		1635	if (w->pending)
		1636	{
		1637	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1638	w->pending = 0;
		1639	}
		1640	}
		1641
		1642	int
		1643	ev_clear_pending (EV_P_ void *w)
		1644	{
		1645	W w_ = (W)w;
		1646	int pending = w_->pending;
		1647
		1648	if (expect_true (pending))
		1649	{
		1650	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1651	w_->pending = 0;
		1652	p->w = 0;
		1653	return p->events;
		1654	}
		1655	else
		1656	return 0;
		1657	}
		1658
		1659	void inline_size
		1660	pri_adjust (EV_P_ W w)
		1661	{
		1662	int pri = w->priority;
		1663	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1664	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1665	w->priority = pri;
		1666	}
		1667
		1668	void inline_speed
		1669	ev_start (EV_P_ W w, int active)
		1670	{
		1671	pri_adjust (EV_A_ w);
		1672	w->active = active;
		1673	ev_ref (EV_A);
		1674	}
		1675
		1676	void inline_size
		1677	ev_stop (EV_P_ W w)
		1678	{
		1679	ev_unref (EV_A);
		1680	w->active = 0;
		1681	}
		1682
		1683	/*****************************************************************************/
		1684
		1685	void noinline
		1686	ev_io_start (EV_P_ ev_io *w)
		1687	{
		1688	int fd = w->fd;
		1689
		1690	if (expect_false (ev_is_active (w)))
		1691	return;
		1692
		1693	assert (("ev_io_start called with negative fd", fd >= 0));
		1694
		1695	ev_start (EV_A_ (W)w, 1);
		1696	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1697	wlist_add (&anfds[fd].head, (WL)w);
		1698
		1699	fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
		1700	w->events &= ~EV_IOFDSET;
		1701	}
		1702
		1703	void noinline
		1704	ev_io_stop (EV_P_ ev_io *w)
		1705	{
		1706	clear_pending (EV_A_ (W)w);
		1707	if (expect_false (!ev_is_active (w)))
		1708	return;
		1709
		1710	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1711
		1712	wlist_del (&anfds[w->fd].head, (WL)w);
		1713	ev_stop (EV_A_ (W)w);
		1714
		1715	fd_change (EV_A_ w->fd, 1);
		1716	}
		1717
		1718	void noinline
		1719	ev_timer_start (EV_P_ ev_timer *w)
		1720	{
		1721	if (expect_false (ev_is_active (w)))
		1722	return;
		1723
		1724	((WT)w)->at += mn_now;
		1725
		1726	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1727
		1728	ev_start (EV_A_ (W)w, ++timercnt);
		1729	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1730	timers [timercnt - 1] = (WT)w;
		1731	upheap (timers, timercnt - 1);
		1732
		1733	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1734	}
		1735
		1736	void noinline
		1737	ev_timer_stop (EV_P_ ev_timer *w)
		1738	{
		1739	clear_pending (EV_A_ (W)w);
		1740	if (expect_false (!ev_is_active (w)))
		1741	return;
		1742
		1743	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1744
		1745	{
		1746	int active = ((W)w)->active;
		1747
		1748	if (expect_true (--active < --timercnt))
		1749	{
		1750	timers [active] = timers [timercnt];
		1751	adjustheap (timers, timercnt, active);
		1752	}
		1753	}
		1754
		1755	((WT)w)->at -= mn_now;
		1756
		1757	ev_stop (EV_A_ (W)w);
		1758	}
		1759
		1760	void noinline
		1761	ev_timer_again (EV_P_ ev_timer *w)
		1762	{
		1763	if (ev_is_active (w))
		1764	{
		1765	if (w->repeat)
		1766	{
		1767	((WT)w)->at = mn_now + w->repeat;
		1768	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1769	}
		1770	else
		1771	ev_timer_stop (EV_A_ w);
		1772	}
		1773	else if (w->repeat)
		1774	{
		1775	w->at = w->repeat;
		1776	ev_timer_start (EV_A_ w);
		1777	}
		1778	}
		1779
		1780	#if EV_PERIODIC_ENABLE
		1781	void noinline
		1782	ev_periodic_start (EV_P_ ev_periodic *w)
		1783	{
		1784	if (expect_false (ev_is_active (w)))
		1785	return;
		1786
		1787	if (w->reschedule_cb)
		1788	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1789	else if (w->interval)
		1790	{
		1791	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1792	/* this formula differs from the one in periodic_reify because we do not always round up */
		1793	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1794	}
		1795	else
		1796	((WT)w)->at = w->offset;
		1797
		1798	ev_start (EV_A_ (W)w, ++periodiccnt);
		1799	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
		1800	periodics [periodiccnt - 1] = (WT)w;
		1801	upheap (periodics, periodiccnt - 1);
		1802
		1803	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1804	}
		1805
		1806	void noinline
		1807	ev_periodic_stop (EV_P_ ev_periodic *w)
		1808	{
		1809	clear_pending (EV_A_ (W)w);
		1810	if (expect_false (!ev_is_active (w)))
		1811	return;
		1812
		1813	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1814
		1815	{
		1816	int active = ((W)w)->active;
		1817
		1818	if (expect_true (--active < --periodiccnt))
		1819	{
		1820	periodics [active] = periodics [periodiccnt];
		1821	adjustheap (periodics, periodiccnt, active);
		1822	}
		1823	}
		1824
		1825	ev_stop (EV_A_ (W)w);
		1826	}
		1827
		1828	void noinline
		1829	ev_periodic_again (EV_P_ ev_periodic *w)
		1830	{
		1831	/* TODO: use adjustheap and recalculation */
		1832	ev_periodic_stop (EV_A_ w);
		1833	ev_periodic_start (EV_A_ w);
		1834	}
		1835	#endif
		1836
		1837	#ifndef SA_RESTART
		1838	# define SA_RESTART 0
		1839	#endif
		1840
		1841	void noinline
		1842	ev_signal_start (EV_P_ ev_signal *w)
		1843	{
		1844	#if EV_MULTIPLICITY
		1845	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1846	#endif
		1847	if (expect_false (ev_is_active (w)))
		1848	return;
		1849
		1850	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1851
		1852	{
		1853	#ifndef _WIN32
		1854	sigset_t full, prev;
		1855	sigfillset (&full);
		1856	sigprocmask (SIG_SETMASK, &full, &prev);
		1857	#endif
		1858
		1859	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1860
		1861	#ifndef _WIN32
		1862	sigprocmask (SIG_SETMASK, &prev, 0);
		1863	#endif
		1864	}
		1865
		1866	ev_start (EV_A_ (W)w, 1);
		1867	wlist_add (&signals [w->signum - 1].head, (WL)w);
		1868
		1869	if (!((WL)w)->next)
		1870	{
		1871	#if _WIN32
		1872	signal (w->signum, sighandler);
		1873	#else
		1874	struct sigaction sa;
		1875	sa.sa_handler = sighandler;
		1876	sigfillset (&sa.sa_mask);
		1877	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1878	sigaction (w->signum, &sa, 0);
		1879	#endif
		1880	}
		1881	}
		1882
		1883	void noinline
		1884	ev_signal_stop (EV_P_ ev_signal *w)
		1885	{
		1886	clear_pending (EV_A_ (W)w);
		1887	if (expect_false (!ev_is_active (w)))
		1888	return;
		1889
		1890	wlist_del (&signals [w->signum - 1].head, (WL)w);
		1891	ev_stop (EV_A_ (W)w);
		1892
		1893	if (!signals [w->signum - 1].head)
		1894	signal (w->signum, SIG_DFL);
		1895	}
		1896
		1897	void
		1898	ev_child_start (EV_P_ ev_child *w)
		1899	{
		1900	#if EV_MULTIPLICITY
		1901	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1902	#endif
		1903	if (expect_false (ev_is_active (w)))
		1904	return;
		1905
		1906	ev_start (EV_A_ (W)w, 1);
		1907	wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1908	}
		1909
		1910	void
		1911	ev_child_stop (EV_P_ ev_child *w)
		1912	{
		1913	clear_pending (EV_A_ (W)w);
		1914	if (expect_false (!ev_is_active (w)))
		1915	return;
		1916
		1917	wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1918	ev_stop (EV_A_ (W)w);
		1919	}
		1920
		1921	#if EV_STAT_ENABLE
		1922
		1923	# ifdef _WIN32
		1924	# undef lstat
		1925	# define lstat(a,b) _stati64 (a,b)
		1926	# endif
		1927
		1928	#define DEF_STAT_INTERVAL 5.0074891
		1929	#define MIN_STAT_INTERVAL 0.1074891
		1930
		1931	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1932
		1933	#if EV_USE_INOTIFY
		1934	# define EV_INOTIFY_BUFSIZE 8192
		1935
		1936	static void noinline
		1937	infy_add (EV_P_ ev_stat *w)
		1938	{
		1939	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);
		1940
		1941	if (w->wd < 0)
		1942	{
		1943	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1944
		1945	/* monitor some parent directory for speedup hints */
		1946	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1947	{
		1948	char path [4096];
		1949	strcpy (path, w->path);
		1950
		1951	do
		1952	{
		1953	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1954	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1955
		1956	char *pend = strrchr (path, '/');
		1957
		1958	if (!pend)
		1959	break; /* whoops, no '/', complain to your admin */
		1960
		1961	*pend = 0;
		1962	w->wd = inotify_add_watch (fs_fd, path, mask);
		1963	}
		1964	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1965	}
		1966	}
		1967	else
		1968	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1969
		1970	if (w->wd >= 0)
		1971	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1972	}
		1973
		1974	static void noinline
		1975	infy_del (EV_P_ ev_stat *w)
		1976	{
		1977	int slot;
		1978	int wd = w->wd;
		1979
		1980	if (wd < 0)
		1981	return;
		1982
		1983	w->wd = -2;
		1984	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1985	wlist_del (&fs_hash [slot].head, (WL)w);
		1986
		1987	/* remove this watcher, if others are watching it, they will rearm */
		1988	inotify_rm_watch (fs_fd, wd);
		1989	}
		1990
		1991	static void noinline
		1992	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1993	{
		1994	if (slot < 0)
		1995	/* overflow, need to check for all hahs slots */
		1996	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1997	infy_wd (EV_A_ slot, wd, ev);
		1998	else
		1999	{
		2000	WL w_;
		2001
		2002	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		2003	{
		2004	ev_stat *w = (ev_stat *)w_;
		2005	w_ = w_->next; /* lets us remove this watcher and all before it */
		2006
		2007	if (w->wd == wd || wd == -1)
		2008	{
		2009	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		2010	{
		2011	w->wd = -1;
		2012	infy_add (EV_A_ w); /* re-add, no matter what */
		2013	}
		2014
		2015	stat_timer_cb (EV_A_ &w->timer, 0);
		2016	}
		2017	}
		2018	}
		2019	}
		2020
430	static void	2021	static void
431	ev_start (struct ev_watcher *w, int active)	2022	infy_cb (EV_P_ ev_io *w, int revents)
432	{	2023	{
433	w->pending = 0;	2024	char buf [EV_INOTIFY_BUFSIZE];
434	w->active = active;	2025	struct inotify_event *ev = (struct inotify_event *)buf;
		2026	int ofs;
		2027	int len = read (fs_fd, buf, sizeof (buf));
		2028
		2029	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		2030	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		2031	}
		2032
		2033	void inline_size
		2034	infy_init (EV_P)
		2035	{
		2036	if (fs_fd != -2)
		2037	return;
		2038
		2039	fs_fd = inotify_init ();
		2040
		2041	if (fs_fd >= 0)
		2042	{
		2043	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		2044	ev_set_priority (&fs_w, EV_MAXPRI);
		2045	ev_io_start (EV_A_ &fs_w);
		2046	}
		2047	}
		2048
		2049	void inline_size
		2050	infy_fork (EV_P)
		2051	{
		2052	int slot;
		2053
		2054	if (fs_fd < 0)
		2055	return;
		2056
		2057	close (fs_fd);
		2058	fs_fd = inotify_init ();
		2059
		2060	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2061	{
		2062	WL w_ = fs_hash [slot].head;
		2063	fs_hash [slot].head = 0;
		2064
		2065	while (w_)
		2066	{
		2067	ev_stat *w = (ev_stat *)w_;
		2068	w_ = w_->next; /* lets us add this watcher */
		2069
		2070	w->wd = -1;
		2071
		2072	if (fs_fd >= 0)
		2073	infy_add (EV_A_ w); /* re-add, no matter what */
		2074	else
		2075	ev_timer_start (EV_A_ &w->timer);
		2076	}
		2077
		2078	}
		2079	}
		2080
		2081	#endif
		2082
		2083	void
		2084	ev_stat_stat (EV_P_ ev_stat *w)
		2085	{
		2086	if (lstat (w->path, &w->attr) < 0)
		2087	w->attr.st_nlink = 0;
		2088	else if (!w->attr.st_nlink)
		2089	w->attr.st_nlink = 1;
		2090	}
		2091
		2092	static void noinline
		2093	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		2094	{
		2095	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2096
		2097	/* we copy this here each the time so that */
		2098	/* prev has the old value when the callback gets invoked */
		2099	w->prev = w->attr;
		2100	ev_stat_stat (EV_A_ w);
		2101
		2102	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2103	if (
		2104	w->prev.st_dev != w->attr.st_dev
		2105	|| w->prev.st_ino != w->attr.st_ino
		2106	|| w->prev.st_mode != w->attr.st_mode
		2107	|| w->prev.st_nlink != w->attr.st_nlink
		2108	|| w->prev.st_uid != w->attr.st_uid
		2109	|| w->prev.st_gid != w->attr.st_gid
		2110	|| w->prev.st_rdev != w->attr.st_rdev
		2111	|| w->prev.st_size != w->attr.st_size
		2112	|| w->prev.st_atime != w->attr.st_atime
		2113	|| w->prev.st_mtime != w->attr.st_mtime
		2114	|| w->prev.st_ctime != w->attr.st_ctime
		2115	) {
		2116	#if EV_USE_INOTIFY
		2117	infy_del (EV_A_ w);
		2118	infy_add (EV_A_ w);
		2119	ev_stat_stat (EV_A_ w); /* avoid race... */
		2120	#endif
		2121
		2122	ev_feed_event (EV_A_ w, EV_STAT);
		2123	}
		2124	}
		2125
		2126	void
		2127	ev_stat_start (EV_P_ ev_stat *w)
		2128	{
		2129	if (expect_false (ev_is_active (w)))
		2130	return;
		2131
		2132	/* since we use memcmp, we need to clear any padding data etc. */
		2133	memset (&w->prev, 0, sizeof (ev_statdata));
		2134	memset (&w->attr, 0, sizeof (ev_statdata));
		2135
		2136	ev_stat_stat (EV_A_ w);
		2137
		2138	if (w->interval < MIN_STAT_INTERVAL)
		2139	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2140
		2141	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2142	ev_set_priority (&w->timer, ev_priority (w));
		2143
		2144	#if EV_USE_INOTIFY
		2145	infy_init (EV_A);
		2146
		2147	if (fs_fd >= 0)
		2148	infy_add (EV_A_ w);
		2149	else
		2150	#endif
		2151	ev_timer_start (EV_A_ &w->timer);
		2152
		2153	ev_start (EV_A_ (W)w, 1);
		2154	}
		2155
		2156	void
		2157	ev_stat_stop (EV_P_ ev_stat *w)
		2158	{
		2159	clear_pending (EV_A_ (W)w);
		2160	if (expect_false (!ev_is_active (w)))
		2161	return;
		2162
		2163	#if EV_USE_INOTIFY
		2164	infy_del (EV_A_ w);
		2165	#endif
		2166	ev_timer_stop (EV_A_ &w->timer);
		2167
		2168	ev_stop (EV_A_ (W)w);
		2169	}
		2170	#endif
		2171
		2172	#if EV_IDLE_ENABLE
		2173	void
		2174	ev_idle_start (EV_P_ ev_idle *w)
		2175	{
		2176	if (expect_false (ev_is_active (w)))
		2177	return;
		2178
		2179	pri_adjust (EV_A_ (W)w);
		2180
		2181	{
		2182	int active = ++idlecnt [ABSPRI (w)];
		2183
		2184	++idleall;
		2185	ev_start (EV_A_ (W)w, active);
		2186
		2187	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2188	idles [ABSPRI (w)][active - 1] = w;
		2189	}
		2190	}
		2191
		2192	void
		2193	ev_idle_stop (EV_P_ ev_idle *w)
		2194	{
		2195	clear_pending (EV_A_ (W)w);
		2196	if (expect_false (!ev_is_active (w)))
		2197	return;
		2198
		2199	{
		2200	int active = ((W)w)->active;
		2201
		2202	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2203	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2204
		2205	ev_stop (EV_A_ (W)w);
		2206	--idleall;
		2207	}
		2208	}
		2209	#endif
		2210
		2211	void
		2212	ev_prepare_start (EV_P_ ev_prepare *w)
		2213	{
		2214	if (expect_false (ev_is_active (w)))
		2215	return;
		2216
		2217	ev_start (EV_A_ (W)w, ++preparecnt);
		2218	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2219	prepares [preparecnt - 1] = w;
		2220	}
		2221
		2222	void
		2223	ev_prepare_stop (EV_P_ ev_prepare *w)
		2224	{
		2225	clear_pending (EV_A_ (W)w);
		2226	if (expect_false (!ev_is_active (w)))
		2227	return;
		2228
		2229	{
		2230	int active = ((W)w)->active;
		2231	prepares [active - 1] = prepares [--preparecnt];
		2232	((W)prepares [active - 1])->active = active;
		2233	}
		2234
		2235	ev_stop (EV_A_ (W)w);
		2236	}
		2237
		2238	void
		2239	ev_check_start (EV_P_ ev_check *w)
		2240	{
		2241	if (expect_false (ev_is_active (w)))
		2242	return;
		2243
		2244	ev_start (EV_A_ (W)w, ++checkcnt);
		2245	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2246	checks [checkcnt - 1] = w;
		2247	}
		2248
		2249	void
		2250	ev_check_stop (EV_P_ ev_check *w)
		2251	{
		2252	clear_pending (EV_A_ (W)w);
		2253	if (expect_false (!ev_is_active (w)))
		2254	return;
		2255
		2256	{
		2257	int active = ((W)w)->active;
		2258	checks [active - 1] = checks [--checkcnt];
		2259	((W)checks [active - 1])->active = active;
		2260	}
		2261
		2262	ev_stop (EV_A_ (W)w);
		2263	}
		2264
		2265	#if EV_EMBED_ENABLE
		2266	void noinline
		2267	ev_embed_sweep (EV_P_ ev_embed *w)
		2268	{
		2269	ev_loop (w->other, EVLOOP_NONBLOCK);
435	}	2270	}
436		2271
437	static void	2272	static void
438	ev_stop (struct ev_watcher *w)	2273	embed_io_cb (EV_P_ ev_io *io, int revents)
439	{	2274	{
440	if (w->pending)	2275	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
441	pendings [w->pending - 1].w = 0;
442		2276
443	w->active = 0;
444	/* nop */
445	}
446
447	void
448	evio_start (struct ev_io *w)
449	{
450	if (ev_is_active (w))	2277	if (ev_cb (w))
451	return;	2278	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	2279	else
		2280	ev_loop (w->other, EVLOOP_NONBLOCK);
		2281	}
		2282
		2283	static void
		2284	embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
		2285	{
		2286	ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
		2287
496	{	2288	{
497	w->at += now;	2289	struct ev_loop *loop = w->other;
498		2290
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	2291	while (fdchangecnt)
500	array_needsize (rtimers, rtimermax, rtimercnt, );
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	2292	{
517	atimers [w->active - 1] = atimers [atimercnt];	2293	fd_reify (EV_A);
518	downheap (atimers, atimercnt, w->active - 1);	2294	ev_loop (EV_A_ EVLOOP_NONBLOCK);
519	}	2295	}
520	}	2296	}
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
530	ev_stop ((struct ev_watcher *)w);
531	}	2297	}
532		2298
533	void	2299	#if 0
534	evsignal_start (struct ev_signal *w)	2300	static void
		2301	embed_idle_cb (EV_P_ ev_idle *idle, int revents)
535	{	2302	{
		2303	ev_idle_stop (EV_A_ idle);
		2304	}
		2305	#endif
		2306
		2307	void
		2308	ev_embed_start (EV_P_ ev_embed *w)
		2309	{
536	if (ev_is_active (w))	2310	if (expect_false (ev_is_active (w)))
537	return;	2311	return;
538		2312
539	ev_start ((struct ev_watcher *)w, 1);	2313	{
540	array_needsize (signals, signalmax, w->signum, signals_init);	2314	struct ev_loop *loop = w->other;
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2315	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
542	}	2316	ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
		2317	}
543		2318
		2319	ev_set_priority (&w->io, ev_priority (w));
		2320	ev_io_start (EV_A_ &w->io);
		2321
		2322	ev_prepare_init (&w->prepare, embed_prepare_cb);
		2323	ev_set_priority (&w->prepare, EV_MINPRI);
		2324	ev_prepare_start (EV_A_ &w->prepare);
		2325
		2326	/*ev_idle_init (&w->idle, e,bed_idle_cb);*/
		2327
		2328	ev_start (EV_A_ (W)w, 1);
		2329	}
		2330
544	void	2331	void
545	evsignal_stop (struct ev_signal *w)	2332	ev_embed_stop (EV_P_ ev_embed *w)
546	{	2333	{
		2334	clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	2335	if (expect_false (!ev_is_active (w)))
548	return;	2336	return;
549		2337
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2338	ev_io_stop (EV_A_ &w->io);
551	ev_stop ((struct ev_watcher *)w);	2339	ev_prepare_stop (EV_A_ &w->prepare);
		2340
		2341	ev_stop (EV_A_ (W)w);
552	}	2342	}
		2343	#endif
		2344
		2345	#if EV_FORK_ENABLE
		2346	void
		2347	ev_fork_start (EV_P_ ev_fork *w)
		2348	{
		2349	if (expect_false (ev_is_active (w)))
		2350	return;
		2351
		2352	ev_start (EV_A_ (W)w, ++forkcnt);
		2353	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2354	forks [forkcnt - 1] = w;
		2355	}
		2356
		2357	void
		2358	ev_fork_stop (EV_P_ ev_fork *w)
		2359	{
		2360	clear_pending (EV_A_ (W)w);
		2361	if (expect_false (!ev_is_active (w)))
		2362	return;
		2363
		2364	{
		2365	int active = ((W)w)->active;
		2366	forks [active - 1] = forks [--forkcnt];
		2367	((W)forks [active - 1])->active = active;
		2368	}
		2369
		2370	ev_stop (EV_A_ (W)w);
		2371	}
		2372	#endif
553		2373
554	/*****************************************************************************/	2374	/*****************************************************************************/
555	#if 1	2375
		2376	struct ev_once
		2377	{
		2378	ev_io io;
		2379	ev_timer to;
		2380	void (*cb)(int revents, void *arg);
		2381	void *arg;
		2382	};
556		2383
557	static void	2384	static void
558	sin_cb (struct ev_io *w, int revents)	2385	once_cb (EV_P_ struct ev_once *once, int revents)
559	{	2386	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2387	void (*cb)(int revents, void *arg) = once->cb;
		2388	void *arg = once->arg;
		2389
		2390	ev_io_stop (EV_A_ &once->io);
		2391	ev_timer_stop (EV_A_ &once->to);
		2392	ev_free (once);
		2393
		2394	cb (revents, arg);
561	}	2395	}
562		2396
563	static void	2397	static void
		2398	once_cb_io (EV_P_ ev_io *w, int revents)
		2399	{
		2400	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2401	}
		2402
		2403	static void
564	ocb (struct ev_timer *w, int revents)	2404	once_cb_to (EV_P_ ev_timer *w, int revents)
565	{	2405	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2406	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}	2407	}
570		2408
571	int main (void)	2409	void
		2410	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
572	{	2411	{
573	struct ev_io sin;	2412	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
574		2413
575	ev_init (0);	2414	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	}	2415	{
594	#endif	2416	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;	2417	return;
604	}	2418	}
605		2419
606	#endif	2420	once->cb = cb;
		2421	once->arg = arg;
607		2422
		2423	ev_init (&once->io, once_cb_io);
		2424	if (fd >= 0)
		2425	{
		2426	ev_io_set (&once->io, fd, events);
		2427	ev_io_start (EV_A_ &once->io);
		2428	}
608		2429
		2430	ev_init (&once->to, once_cb_to);
		2431	if (timeout >= 0.)
		2432	{
		2433	ev_timer_set (&once->to, timeout, 0.);
		2434	ev_timer_start (EV_A_ &once->to);
		2435	}
		2436	}
609		2437
		2438	#if EV_MULTIPLICITY
		2439	#include "ev_wrap.h"
		2440	#endif
610		2441
		2442	#ifdef __cplusplus
		2443	}
		2444	#endif
		2445

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