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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 1.202 by root, Sat Dec 29 16:19:36 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without modifica-
		8	* tion, are permitted provided that the following conditions are met:
		9	*
		10	* 1. Redistributions of source code must retain the above copyright notice,
		11	* this list of conditions and the following disclaimer.
		12	*
		13	* 2. Redistributions in binary form must reproduce the above copyright
		14	* notice, this list of conditions and the following disclaimer in the
		15	* documentation and/or other materials provided with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
		18	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
		19	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
		20	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
		21	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
		22	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
		23	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
		24	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
		25	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
		26	* OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*
		28	* Alternatively, the contents of this file may be used under the terms of
		29	* the GNU General Public License ("GPL") version 2 or any later version,
		30	* in which case the provisions of the GPL are applicable instead of
		31	* the above. If you wish to allow the use of your version of this file
		32	* only under the terms of the GPL and not to allow others to use your
		33	* version of this file under the BSD license, indicate your decision
		34	* by deleting the provisions above and replace them with the notice
		35	* and other provisions required by the GPL. If you do not delete the
		36	* provisions above, a recipient may use your version of this file under
		37	* either the BSD or the GPL.
		38	*/
		39
		40	#ifdef __cplusplus
		41	extern "C" {
		42	#endif
		43
		44	#ifndef EV_STANDALONE
		45	# ifdef EV_CONFIG_H
		46	# include EV_CONFIG_H
		47	# else
		48	# include "config.h"
		49	# endif
		50
		51	# if HAVE_CLOCK_GETTIME
		52	# ifndef EV_USE_MONOTONIC
		53	# define EV_USE_MONOTONIC 1
		54	# endif
		55	# ifndef EV_USE_REALTIME
		56	# define EV_USE_REALTIME 1
		57	# endif
		58	# else
		59	# ifndef EV_USE_MONOTONIC
		60	# define EV_USE_MONOTONIC 0
		61	# endif
		62	# ifndef EV_USE_REALTIME
		63	# define EV_USE_REALTIME 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_NANOSLEEP
		68	# if HAVE_NANOSLEEP
		69	# define EV_USE_NANOSLEEP 1
		70	# else
		71	# define EV_USE_NANOSLEEP 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_SELECT
		76	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		77	# define EV_USE_SELECT 1
		78	# else
		79	# define EV_USE_SELECT 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_POLL
		84	# if HAVE_POLL && HAVE_POLL_H
		85	# define EV_USE_POLL 1
		86	# else
		87	# define EV_USE_POLL 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_EPOLL
		92	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		93	# define EV_USE_EPOLL 1
		94	# else
		95	# define EV_USE_EPOLL 0
		96	# endif
		97	# endif
		98
		99	# ifndef EV_USE_KQUEUE
		100	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		101	# define EV_USE_KQUEUE 1
		102	# else
		103	# define EV_USE_KQUEUE 0
		104	# endif
		105	# endif
		106
		107	# ifndef EV_USE_PORT
		108	# if HAVE_PORT_H && HAVE_PORT_CREATE
		109	# define EV_USE_PORT 1
		110	# else
		111	# define EV_USE_PORT 0
		112	# endif
		113	# endif
		114
		115	# ifndef EV_USE_INOTIFY
		116	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		117	# define EV_USE_INOTIFY 1
		118	# else
		119	# define EV_USE_INOTIFY 0
		120	# endif
		121	# endif
		122
		123	#endif
		124
1	#include <math.h>	125	#include <math.h>
2	#include <stdlib.h>	126	#include <stdlib.h>
		127	#include <fcntl.h>
		128	#include <stddef.h>
3		129
4	#include <stdio.h>	130	#include <stdio.h>
5		131
6	#include <assert.h>	132	#include <assert.h>
7	#include <errno.h>	133	#include <errno.h>
8	#include <sys/time.h>	134	#include <sys/types.h>
9	#include <time.h>	135	#include <time.h>
10		136
		137	#include <signal.h>
		138
		139	#ifdef EV_H
		140	# include EV_H
		141	#else
		142	# include "ev.h"
		143	#endif
		144
		145	#ifndef _WIN32
		146	# include <sys/time.h>
		147	# include <sys/wait.h>
		148	# include <unistd.h>
		149	#else
		150	# define WIN32_LEAN_AND_MEAN
		151	# include <windows.h>
		152	# ifndef EV_SELECT_IS_WINSOCKET
		153	# define EV_SELECT_IS_WINSOCKET 1
		154	# endif
		155	#endif
		156
		157	/**/
		158
		159	#ifndef EV_USE_MONOTONIC
		160	# define EV_USE_MONOTONIC 0
		161	#endif
		162
		163	#ifndef EV_USE_REALTIME
		164	# define EV_USE_REALTIME 0
		165	#endif
		166
		167	#ifndef EV_USE_NANOSLEEP
		168	# define EV_USE_NANOSLEEP 0
		169	#endif
		170
		171	#ifndef EV_USE_SELECT
		172	# define EV_USE_SELECT 1
		173	#endif
		174
		175	#ifndef EV_USE_POLL
		176	# ifdef _WIN32
		177	# define EV_USE_POLL 0
		178	# else
		179	# define EV_USE_POLL 1
		180	# endif
		181	#endif
		182
		183	#ifndef EV_USE_EPOLL
		184	# define EV_USE_EPOLL 0
		185	#endif
		186
		187	#ifndef EV_USE_KQUEUE
		188	# define EV_USE_KQUEUE 0
		189	#endif
		190
		191	#ifndef EV_USE_PORT
		192	# define EV_USE_PORT 0
		193	#endif
		194
		195	#ifndef EV_USE_INOTIFY
		196	# define EV_USE_INOTIFY 0
		197	#endif
		198
		199	#ifndef EV_PID_HASHSIZE
		200	# if EV_MINIMAL
		201	# define EV_PID_HASHSIZE 1
		202	# else
		203	# define EV_PID_HASHSIZE 16
		204	# endif
		205	#endif
		206
		207	#ifndef EV_INOTIFY_HASHSIZE
		208	# if EV_MINIMAL
		209	# define EV_INOTIFY_HASHSIZE 1
		210	# else
		211	# define EV_INOTIFY_HASHSIZE 16
		212	# endif
		213	#endif
		214
		215	/**/
		216
11	#ifdef CLOCK_MONOTONIC	217	#ifndef CLOCK_MONOTONIC
		218	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	219	# define EV_USE_MONOTONIC 0
		220	#endif
		221
		222	#ifndef CLOCK_REALTIME
		223	# undef EV_USE_REALTIME
		224	# define EV_USE_REALTIME 0
		225	#endif
		226
		227	#if !EV_STAT_ENABLE
		228	# undef EV_USE_INOTIFY
		229	# define EV_USE_INOTIFY 0
		230	#endif
		231
		232	#if !EV_USE_NANOSLEEP
		233	# ifndef _WIN32
		234	# include <sys/select.h>
13	#endif	235	# endif
		236	#endif
14		237
15	#define HAVE_REALTIME 1	238	#if EV_USE_INOTIFY
16	#define HAVE_EPOLL 1	239	# include <sys/inotify.h>
17	#define HAVE_SELECT 1	240	#endif
		241
		242	#if EV_SELECT_IS_WINSOCKET
		243	# include <winsock.h>
		244	#endif
		245
		246	/**/
		247
		248	/*
		249	* This is used to avoid floating point rounding problems.
		250	* It is added to ev_rt_now when scheduling periodics
		251	* to ensure progress, time-wise, even when rounding
		252	* errors are against us.
		253	* This value is good at least till the year 4000.
		254	* Better solutions welcome.
		255	*/
		256	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18		257
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	258	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	259	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		260	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21		261
		262	#if __GNUC__ >= 4
		263	# define expect(expr,value) __builtin_expect ((expr),(value))
		264	# define noinline __attribute__ ((noinline))
		265	#else
		266	# define expect(expr,value) (expr)
		267	# define noinline
		268	# if __STDC_VERSION__ < 199901L
		269	# define inline
		270	# endif
		271	#endif
		272
		273	#define expect_false(expr) expect ((expr) != 0, 0)
		274	#define expect_true(expr) expect ((expr) != 0, 1)
		275	#define inline_size static inline
		276
		277	#if EV_MINIMAL
		278	# define inline_speed static noinline
		279	#else
		280	# define inline_speed static inline
		281	#endif
		282
		283	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		284	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		285
		286	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		287	#define EMPTY2(a,b) /* used to suppress some warnings */
		288
		289	typedef ev_watcher *W;
		290	typedef ev_watcher_list *WL;
		291	typedef ev_watcher_time *WT;
		292
		293	#if EV_USE_MONOTONIC
		294	/* sig_atomic_t is used to avoid per-thread variables or locking but still */
		295	/* giving it a reasonably high chance of working on typical architetcures */
		296	static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		297	#endif
		298
		299	#ifdef _WIN32
		300	# include "ev_win32.c"
		301	#endif
		302
		303	/*****************************************************************************/
		304
		305	static void (*syserr_cb)(const char *msg);
		306
		307	void
		308	ev_set_syserr_cb (void (*cb)(const char *msg))
		309	{
		310	syserr_cb = cb;
		311	}
		312
		313	static void noinline
		314	syserr (const char *msg)
		315	{
		316	if (!msg)
		317	msg = "(libev) system error";
		318
		319	if (syserr_cb)
		320	syserr_cb (msg);
		321	else
		322	{
		323	perror (msg);
		324	abort ();
		325	}
		326	}
		327
		328	static void *(*alloc)(void *ptr, long size);
		329
		330	void
		331	ev_set_allocator (void *(*cb)(void *ptr, long size))
		332	{
		333	alloc = cb;
		334	}
		335
		336	inline_speed void *
		337	ev_realloc (void *ptr, long size)
		338	{
		339	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		340
		341	if (!ptr && size)
		342	{
		343	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		344	abort ();
		345	}
		346
		347	return ptr;
		348	}
		349
		350	#define ev_malloc(size) ev_realloc (0, (size))
		351	#define ev_free(ptr) ev_realloc ((ptr), 0)
		352
		353	/*****************************************************************************/
		354
		355	typedef struct
		356	{
		357	WL head;
		358	unsigned char events;
		359	unsigned char reify;
		360	#if EV_SELECT_IS_WINSOCKET
		361	SOCKET handle;
		362	#endif
		363	} ANFD;
		364
		365	typedef struct
		366	{
		367	W w;
		368	int events;
		369	} ANPENDING;
		370
		371	#if EV_USE_INOTIFY
		372	typedef struct
		373	{
		374	WL head;
		375	} ANFS;
		376	#endif
		377
		378	#if EV_MULTIPLICITY
		379
		380	struct ev_loop
		381	{
		382	ev_tstamp ev_rt_now;
		383	#define ev_rt_now ((loop)->ev_rt_now)
		384	#define VAR(name,decl) decl;
		385	#include "ev_vars.h"
		386	#undef VAR
		387	};
22	#include "ev.h"	388	#include "ev_wrap.h"
23		389
24	struct ev_watcher {	390	static struct ev_loop default_loop_struct;
25	EV_WATCHER (ev_watcher);	391	struct ev_loop *ev_default_loop_ptr;
26	};
27		392
28	struct ev_watcher_list {	393	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		394
32	static ev_tstamp now, diff; /* monotonic clock */
33	ev_tstamp ev_now;	395	ev_tstamp ev_rt_now;
34	int ev_method;	396	#define VAR(name,decl) static decl;
		397	#include "ev_vars.h"
		398	#undef VAR
35		399
36	static int have_monotonic; /* runtime */	400	static int ev_default_loop_ptr;
37		401
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	402	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	403
40	static void (*method_poll)(ev_tstamp timeout);	404	/*****************************************************************************/
41		405
42	ev_tstamp	406	ev_tstamp
43	ev_time (void)	407	ev_time (void)
44	{	408	{
45	#if HAVE_REALTIME	409	#if EV_USE_REALTIME
46	struct timespec ts;	410	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	411	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	412	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	413	#else
50	struct timeval tv;	414	struct timeval tv;
51	gettimeofday (&tv, 0);	415	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	416	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	417	#endif
54	}	418	}
55		419
56	static ev_tstamp	420	ev_tstamp inline_size
57	get_clock (void)	421	get_clock (void)
58	{	422	{
59	#if HAVE_MONOTONIC	423	#if EV_USE_MONOTONIC
60	if (have_monotonic)	424	if (expect_true (have_monotonic))
61	{	425	{
62	struct timespec ts;	426	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	427	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	428	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	429	}
66	#endif	430	#endif
67		431
68	return ev_time ();	432	return ev_time ();
69	}	433	}
70		434
		435	#if EV_MULTIPLICITY
		436	ev_tstamp
		437	ev_now (EV_P)
		438	{
		439	return ev_rt_now;
		440	}
		441	#endif
		442
		443	void
		444	ev_sleep (ev_tstamp delay)
		445	{
		446	if (delay > 0.)
		447	{
		448	#if EV_USE_NANOSLEEP
		449	struct timespec ts;
		450
		451	ts.tv_sec = (time_t)delay;
		452	ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
		453
		454	nanosleep (&ts, 0);
		455	#elif defined(_WIN32)
		456	Sleep (delay * 1e3);
		457	#else
		458	struct timeval tv;
		459
		460	tv.tv_sec = (time_t)delay;
		461	tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
		462
		463	select (0, 0, 0, 0, &tv);
		464	#endif
		465	}
		466	}
		467
		468	/*****************************************************************************/
		469
		470	int inline_size
		471	array_nextsize (int elem, int cur, int cnt)
		472	{
		473	int ncur = cur + 1;
		474
		475	do
		476	ncur <<= 1;
		477	while (cnt > ncur);
		478
		479	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		480	if (elem * ncur > 4096)
		481	{
		482	ncur *= elem;
		483	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		484	ncur = ncur - sizeof (void *) * 4;
		485	ncur /= elem;
		486	}
		487
		488	return ncur;
		489	}
		490
		491	static noinline void *
		492	array_realloc (int elem, void *base, int *cur, int cnt)
		493	{
		494	*cur = array_nextsize (elem, *cur, cnt);
		495	return ev_realloc (base, elem * *cur);
		496	}
		497
71	#define array_needsize(base,cur,cnt,init) \	498	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	499	if (expect_false ((cnt) > (cur))) \
73	{ \	500	{ \
74	int newcnt = cur ? cur << 1 : 16; \	501	int ocur_ = (cur); \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	502	(base) = (type *)array_realloc \
76	base = realloc (base, sizeof (*base) * (newcnt)); \	503	(sizeof (type), (base), &(cur), (cnt)); \
77	init (base + cur, newcnt - cur); \	504	init ((base) + (ocur_), (cur) - ocur_); \
78	cur = newcnt; \	505	}
		506
		507	#if 0
		508	#define array_slim(type,stem) \
		509	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		510	{ \
		511	stem ## max = array_roundsize (stem ## cnt >> 1); \
		512	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		513	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		514	}
		515	#endif
		516
		517	#define array_free(stem, idx) \
		518	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		519
		520	/*****************************************************************************/
		521
		522	void noinline
		523	ev_feed_event (EV_P_ void *w, int revents)
		524	{
		525	W w_ = (W)w;
		526	int pri = ABSPRI (w_);
		527
		528	if (expect_false (w_->pending))
		529	pendings [pri][w_->pending - 1].events |= revents;
		530	else
79	}	531	{
		532	w_->pending = ++pendingcnt [pri];
		533	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		534	pendings [pri][w_->pending - 1].w = w_;
		535	pendings [pri][w_->pending - 1].events = revents;
		536	}
		537	}
80		538
81	typedef struct	539	void inline_speed
		540	queue_events (EV_P_ W *events, int eventcnt, int type)
82	{	541	{
83	struct ev_io *head;	542	int i;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86		543
87	static ANFD *anfds;	544	for (i = 0; i < eventcnt; ++i)
88	static int anfdmax;	545	ev_feed_event (EV_A_ events [i], type);
		546	}
89		547
90	static int *fdchanges;	548	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		549
93	static void	550	void inline_size
94	anfds_init (ANFD *base, int count)	551	anfds_init (ANFD *base, int count)
95	{	552	{
96	while (count--)	553	while (count--)
97	{	554	{
98	base->head = 0;	555	base->head = 0;
99	base->wev = base->rev = EV_NONE;	556	base->events = EV_NONE;
		557	base->reify = 0;
		558
100	++base;	559	++base;
101	}	560	}
102	}	561	}
103		562
104	typedef struct	563	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)	564	fd_event (EV_P_ int fd, int revents)
124	{	565	{
125	ANFD *anfd = anfds + fd;	566	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	567	ev_io *w;
127		568
128	for (w = anfd->head; w; w = w->next)	569	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129	{	570	{
130	int ev = w->events & events;	571	int ev = w->events & revents;
131		572
132	if (ev)	573	if (ev)
133	event ((struct ev_watcher *)w, ev);	574	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	{	575	}
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	}	576	}
159		577
160	static void	578	void
161	downheap (struct ev_timer **timers, int N, int k)	579	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	580	{
163	struct ev_timer *w = timers [k];	581	if (fd >= 0 && fd < anfdmax)
164		582	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	}	583	}
183		584
184	static struct ev_signal **signals;	585	void inline_size
185	static int signalmax;	586	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	{	587	{
247	int i;	588	int i;
248		589
249	for (i = 0; i < fdchangecnt; ++i)	590	for (i = 0; i < fdchangecnt; ++i)
250	{	591	{
251	int fd = fdchanges [i];	592	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	593	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	594	ev_io *w;
254		595
255	int wev = 0;	596	unsigned char events = 0;
256		597
257	for (w = anfd->head; w; w = w->next)	598	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
258	wev |= w->events;	599	events |= (unsigned char)w->events;
259		600
260	if (anfd->wev != wev)	601	#if EV_SELECT_IS_WINSOCKET
		602	if (events)
261	{	603	{
262	method_modify (fd, anfd->wev, wev);	604	unsigned long argp;
263	anfd->wev = wev;	605	#ifdef EV_FD_TO_WIN32_HANDLE
		606	anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
		607	#else
		608	anfd->handle = _get_osfhandle (fd);
		609	#endif
		610	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	611	}
		612	#endif
		613
		614	{
		615	unsigned char o_events = anfd->events;
		616	unsigned char o_reify = anfd->reify;
		617
		618	anfd->reify = 0;
		619	anfd->events = events;
		620
		621	if (o_events != events || o_reify & EV_IOFDSET)
		622	backend_modify (EV_A_ fd, o_events, events);
		623	}
265	}	624	}
266		625
267	fdchangecnt = 0;	626	fdchangecnt = 0;
268	}	627	}
269		628
		629	void inline_size
		630	fd_change (EV_P_ int fd, int flags)
		631	{
		632	unsigned char reify = anfds [fd].reify;
		633	anfds [fd].reify |= flags;
		634
		635	if (expect_true (!reify))
		636	{
		637	++fdchangecnt;
		638	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		639	fdchanges [fdchangecnt - 1] = fd;
		640	}
		641	}
		642
		643	void inline_speed
		644	fd_kill (EV_P_ int fd)
		645	{
		646	ev_io *w;
		647
		648	while ((w = (ev_io *)anfds [fd].head))
		649	{
		650	ev_io_stop (EV_A_ w);
		651	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		652	}
		653	}
		654
		655	int inline_size
		656	fd_valid (int fd)
		657	{
		658	#ifdef _WIN32
		659	return _get_osfhandle (fd) != -1;
		660	#else
		661	return fcntl (fd, F_GETFD) != -1;
		662	#endif
		663	}
		664
		665	/* called on EBADF to verify fds */
		666	static void noinline
		667	fd_ebadf (EV_P)
		668	{
		669	int fd;
		670
		671	for (fd = 0; fd < anfdmax; ++fd)
		672	if (anfds [fd].events)
		673	if (!fd_valid (fd) == -1 && errno == EBADF)
		674	fd_kill (EV_A_ fd);
		675	}
		676
		677	/* called on ENOMEM in select/poll to kill some fds and retry */
		678	static void noinline
		679	fd_enomem (EV_P)
		680	{
		681	int fd;
		682
		683	for (fd = anfdmax; fd--; )
		684	if (anfds [fd].events)
		685	{
		686	fd_kill (EV_A_ fd);
		687	return;
		688	}
		689	}
		690
		691	/* usually called after fork if backend needs to re-arm all fds from scratch */
		692	static void noinline
		693	fd_rearm_all (EV_P)
		694	{
		695	int fd;
		696
		697	for (fd = 0; fd < anfdmax; ++fd)
		698	if (anfds [fd].events)
		699	{
		700	anfds [fd].events = 0;
		701	fd_change (EV_A_ fd, EV_IOFDSET | 1);
		702	}
		703	}
		704
		705	/*****************************************************************************/
		706
		707	void inline_speed
		708	upheap (WT *heap, int k)
		709	{
		710	WT w = heap [k];
		711
		712	while (k)
		713	{
		714	int p = (k - 1) >> 1;
		715
		716	if (heap [p]->at <= w->at)
		717	break;
		718
		719	heap [k] = heap [p];
		720	((W)heap [k])->active = k + 1;
		721	k = p;
		722	}
		723
		724	heap [k] = w;
		725	((W)heap [k])->active = k + 1;
		726	}
		727
		728	void inline_speed
		729	downheap (WT *heap, int N, int k)
		730	{
		731	WT w = heap [k];
		732
		733	for (;;)
		734	{
		735	int c = (k << 1) + 1;
		736
		737	if (c >= N)
		738	break;
		739
		740	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		741	? 1 : 0;
		742
		743	if (w->at <= heap [c]->at)
		744	break;
		745
		746	heap [k] = heap [c];
		747	((W)heap [k])->active = k + 1;
		748
		749	k = c;
		750	}
		751
		752	heap [k] = w;
		753	((W)heap [k])->active = k + 1;
		754	}
		755
		756	void inline_size
		757	adjustheap (WT *heap, int N, int k)
		758	{
		759	upheap (heap, k);
		760	downheap (heap, N, k);
		761	}
		762
		763	/*****************************************************************************/
		764
		765	typedef struct
		766	{
		767	WL head;
		768	sig_atomic_t volatile gotsig;
		769	} ANSIG;
		770
		771	static ANSIG *signals;
		772	static int signalmax;
		773
		774	static int sigpipe [2];
		775	static sig_atomic_t volatile gotsig;
		776	static ev_io sigev;
		777
		778	void inline_size
		779	signals_init (ANSIG *base, int count)
		780	{
		781	while (count--)
		782	{
		783	base->head = 0;
		784	base->gotsig = 0;
		785
		786	++base;
		787	}
		788	}
		789
270	static void	790	static void
271	call_pending ()	791	sighandler (int signum)
		792	{
		793	#if _WIN32
		794	signal (signum, sighandler);
		795	#endif
		796
		797	signals [signum - 1].gotsig = 1;
		798
		799	if (!gotsig)
		800	{
		801	int old_errno = errno;
		802	gotsig = 1;
		803	write (sigpipe [1], &signum, 1);
		804	errno = old_errno;
		805	}
		806	}
		807
		808	void noinline
		809	ev_feed_signal_event (EV_P_ int signum)
		810	{
		811	WL w;
		812
		813	#if EV_MULTIPLICITY
		814	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		815	#endif
		816
		817	--signum;
		818
		819	if (signum < 0 || signum >= signalmax)
		820	return;
		821
		822	signals [signum].gotsig = 0;
		823
		824	for (w = signals [signum].head; w; w = w->next)
		825	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		826	}
		827
		828	static void
		829	sigcb (EV_P_ ev_io *iow, int revents)
		830	{
		831	int signum;
		832
		833	read (sigpipe [0], &revents, 1);
		834	gotsig = 0;
		835
		836	for (signum = signalmax; signum--; )
		837	if (signals [signum].gotsig)
		838	ev_feed_signal_event (EV_A_ signum + 1);
		839	}
		840
		841	void inline_speed
		842	fd_intern (int fd)
		843	{
		844	#ifdef _WIN32
		845	int arg = 1;
		846	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		847	#else
		848	fcntl (fd, F_SETFD, FD_CLOEXEC);
		849	fcntl (fd, F_SETFL, O_NONBLOCK);
		850	#endif
		851	}
		852
		853	static void noinline
		854	siginit (EV_P)
		855	{
		856	fd_intern (sigpipe [0]);
		857	fd_intern (sigpipe [1]);
		858
		859	ev_io_set (&sigev, sigpipe [0], EV_READ);
		860	ev_io_start (EV_A_ &sigev);
		861	ev_unref (EV_A); /* child watcher should not keep loop alive */
		862	}
		863
		864	/*****************************************************************************/
		865
		866	static WL childs [EV_PID_HASHSIZE];
		867
		868	#ifndef _WIN32
		869
		870	static ev_signal childev;
		871
		872	void inline_speed
		873	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		874	{
		875	ev_child *w;
		876
		877	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		878	if (w->pid == pid || !w->pid)
		879	{
		880	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
		881	w->rpid = pid;
		882	w->rstatus = status;
		883	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		884	}
		885	}
		886
		887	#ifndef WCONTINUED
		888	# define WCONTINUED 0
		889	#endif
		890
		891	static void
		892	childcb (EV_P_ ev_signal *sw, int revents)
		893	{
		894	int pid, status;
		895
		896	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
		897	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		898	if (!WCONTINUED
		899	|| errno != EINVAL
		900	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		901	return;
		902
		903	/* make sure we are called again until all childs have been reaped */
		904	/* we need to do it this way so that the callback gets called before we continue */
		905	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		906
		907	child_reap (EV_A_ sw, pid, pid, status);
		908	if (EV_PID_HASHSIZE > 1)
		909	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		910	}
		911
		912	#endif
		913
		914	/*****************************************************************************/
		915
		916	#if EV_USE_PORT
		917	# include "ev_port.c"
		918	#endif
		919	#if EV_USE_KQUEUE
		920	# include "ev_kqueue.c"
		921	#endif
		922	#if EV_USE_EPOLL
		923	# include "ev_epoll.c"
		924	#endif
		925	#if EV_USE_POLL
		926	# include "ev_poll.c"
		927	#endif
		928	#if EV_USE_SELECT
		929	# include "ev_select.c"
		930	#endif
		931
		932	int
		933	ev_version_major (void)
		934	{
		935	return EV_VERSION_MAJOR;
		936	}
		937
		938	int
		939	ev_version_minor (void)
		940	{
		941	return EV_VERSION_MINOR;
		942	}
		943
		944	/* return true if we are running with elevated privileges and should ignore env variables */
		945	int inline_size
		946	enable_secure (void)
		947	{
		948	#ifdef _WIN32
		949	return 0;
		950	#else
		951	return getuid () != geteuid ()
		952	|| getgid () != getegid ();
		953	#endif
		954	}
		955
		956	unsigned int
		957	ev_supported_backends (void)
		958	{
		959	unsigned int flags = 0;
		960
		961	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		962	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		963	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		964	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		965	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		966
		967	return flags;
		968	}
		969
		970	unsigned int
		971	ev_recommended_backends (void)
		972	{
		973	unsigned int flags = ev_supported_backends ();
		974
		975	#ifndef __NetBSD__
		976	/* kqueue is borked on everything but netbsd apparently */
		977	/* it usually doesn't work correctly on anything but sockets and pipes */
		978	flags &= ~EVBACKEND_KQUEUE;
		979	#endif
		980	#ifdef __APPLE__
		981	// flags &= ~EVBACKEND_KQUEUE; for documentation
		982	flags &= ~EVBACKEND_POLL;
		983	#endif
		984
		985	return flags;
		986	}
		987
		988	unsigned int
		989	ev_embeddable_backends (void)
		990	{
		991	int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
		992
		993	/* epoll embeddability broken on all linux versions up to at least 2.6.23 */
		994	/* please fix it and tell me how to detect the fix */
		995	flags &= ~EVBACKEND_EPOLL;
		996
		997	return flags;
		998	}
		999
		1000	unsigned int
		1001	ev_backend (EV_P)
		1002	{
		1003	return backend;
		1004	}
		1005
		1006	unsigned int
		1007	ev_loop_count (EV_P)
		1008	{
		1009	return loop_count;
		1010	}
		1011
		1012	void
		1013	ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
		1014	{
		1015	io_blocktime = interval;
		1016	}
		1017
		1018	void
		1019	ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
		1020	{
		1021	timeout_blocktime = interval;
		1022	}
		1023
		1024	static void noinline
		1025	loop_init (EV_P_ unsigned int flags)
		1026	{
		1027	if (!backend)
		1028	{
		1029	#if EV_USE_MONOTONIC
		1030	{
		1031	struct timespec ts;
		1032	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		1033	have_monotonic = 1;
		1034	}
		1035	#endif
		1036
		1037	ev_rt_now = ev_time ();
		1038	mn_now = get_clock ();
		1039	now_floor = mn_now;
		1040	rtmn_diff = ev_rt_now - mn_now;
		1041
		1042	io_blocktime = 0.;
		1043	timeout_blocktime = 0.;
		1044
		1045	/* pid check not overridable via env */
		1046	#ifndef _WIN32
		1047	if (flags & EVFLAG_FORKCHECK)
		1048	curpid = getpid ();
		1049	#endif
		1050
		1051	if (!(flags & EVFLAG_NOENV)
		1052	&& !enable_secure ()
		1053	&& getenv ("LIBEV_FLAGS"))
		1054	flags = atoi (getenv ("LIBEV_FLAGS"));
		1055
		1056	if (!(flags & 0x0000ffffUL))
		1057	flags |= ev_recommended_backends ();
		1058
		1059	backend = 0;
		1060	backend_fd = -1;
		1061	#if EV_USE_INOTIFY
		1062	fs_fd = -2;
		1063	#endif
		1064
		1065	#if EV_USE_PORT
		1066	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		1067	#endif
		1068	#if EV_USE_KQUEUE
		1069	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		1070	#endif
		1071	#if EV_USE_EPOLL
		1072	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		1073	#endif
		1074	#if EV_USE_POLL
		1075	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		1076	#endif
		1077	#if EV_USE_SELECT
		1078	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		1079	#endif
		1080
		1081	ev_init (&sigev, sigcb);
		1082	ev_set_priority (&sigev, EV_MAXPRI);
		1083	}
		1084	}
		1085
		1086	static void noinline
		1087	loop_destroy (EV_P)
272	{	1088	{
273	int i;	1089	int i;
274		1090
275	for (i = 0; i < pendingcnt; ++i)	1091	#if EV_USE_INOTIFY
		1092	if (fs_fd >= 0)
		1093	close (fs_fd);
		1094	#endif
		1095
		1096	if (backend_fd >= 0)
		1097	close (backend_fd);
		1098
		1099	#if EV_USE_PORT
		1100	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1101	#endif
		1102	#if EV_USE_KQUEUE
		1103	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1104	#endif
		1105	#if EV_USE_EPOLL
		1106	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1107	#endif
		1108	#if EV_USE_POLL
		1109	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1110	#endif
		1111	#if EV_USE_SELECT
		1112	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1113	#endif
		1114
		1115	for (i = NUMPRI; i--; )
		1116	{
		1117	array_free (pending, [i]);
		1118	#if EV_IDLE_ENABLE
		1119	array_free (idle, [i]);
		1120	#endif
276	{	1121	}
277	ANPENDING *p = pendings + i;
278		1122
279	if (p->w)	1123	ev_free (anfds); anfdmax = 0;
		1124
		1125	/* have to use the microsoft-never-gets-it-right macro */
		1126	array_free (fdchange, EMPTY);
		1127	array_free (timer, EMPTY);
		1128	#if EV_PERIODIC_ENABLE
		1129	array_free (periodic, EMPTY);
		1130	#endif
		1131	#if EV_FORK_ENABLE
		1132	array_free (fork, EMPTY);
		1133	#endif
		1134	array_free (prepare, EMPTY);
		1135	array_free (check, EMPTY);
		1136
		1137	backend = 0;
		1138	}
		1139
		1140	void inline_size infy_fork (EV_P);
		1141
		1142	void inline_size
		1143	loop_fork (EV_P)
		1144	{
		1145	#if EV_USE_PORT
		1146	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1147	#endif
		1148	#if EV_USE_KQUEUE
		1149	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1150	#endif
		1151	#if EV_USE_EPOLL
		1152	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1153	#endif
		1154	#if EV_USE_INOTIFY
		1155	infy_fork (EV_A);
		1156	#endif
		1157
		1158	if (ev_is_active (&sigev))
		1159	{
		1160	/* default loop */
		1161
		1162	ev_ref (EV_A);
		1163	ev_io_stop (EV_A_ &sigev);
		1164	close (sigpipe [0]);
		1165	close (sigpipe [1]);
		1166
		1167	while (pipe (sigpipe))
		1168	syserr ("(libev) error creating pipe");
		1169
		1170	siginit (EV_A);
		1171	}
		1172
		1173	postfork = 0;
		1174	}
		1175
		1176	#if EV_MULTIPLICITY
		1177	struct ev_loop *
		1178	ev_loop_new (unsigned int flags)
		1179	{
		1180	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1181
		1182	memset (loop, 0, sizeof (struct ev_loop));
		1183
		1184	loop_init (EV_A_ flags);
		1185
		1186	if (ev_backend (EV_A))
		1187	return loop;
		1188
		1189	return 0;
		1190	}
		1191
		1192	void
		1193	ev_loop_destroy (EV_P)
		1194	{
		1195	loop_destroy (EV_A);
		1196	ev_free (loop);
		1197	}
		1198
		1199	void
		1200	ev_loop_fork (EV_P)
		1201	{
		1202	postfork = 1;
		1203	}
		1204
		1205	#endif
		1206
		1207	#if EV_MULTIPLICITY
		1208	struct ev_loop *
		1209	ev_default_loop_init (unsigned int flags)
		1210	#else
		1211	int
		1212	ev_default_loop (unsigned int flags)
		1213	#endif
		1214	{
		1215	if (sigpipe [0] == sigpipe [1])
		1216	if (pipe (sigpipe))
		1217	return 0;
		1218
		1219	if (!ev_default_loop_ptr)
		1220	{
		1221	#if EV_MULTIPLICITY
		1222	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1223	#else
		1224	ev_default_loop_ptr = 1;
		1225	#endif
		1226
		1227	loop_init (EV_A_ flags);
		1228
		1229	if (ev_backend (EV_A))
280	{	1230	{
281	p->w->pending = 0;	1231	siginit (EV_A);
282	p->w->cb (p->w, p->events);	1232
		1233	#ifndef _WIN32
		1234	ev_signal_init (&childev, childcb, SIGCHLD);
		1235	ev_set_priority (&childev, EV_MAXPRI);
		1236	ev_signal_start (EV_A_ &childev);
		1237	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1238	#endif
283	}	1239	}
		1240	else
		1241	ev_default_loop_ptr = 0;
		1242	}
		1243
		1244	return ev_default_loop_ptr;
		1245	}
		1246
		1247	void
		1248	ev_default_destroy (void)
		1249	{
		1250	#if EV_MULTIPLICITY
		1251	struct ev_loop *loop = ev_default_loop_ptr;
		1252	#endif
		1253
		1254	#ifndef _WIN32
		1255	ev_ref (EV_A); /* child watcher */
		1256	ev_signal_stop (EV_A_ &childev);
		1257	#endif
		1258
		1259	ev_ref (EV_A); /* signal watcher */
		1260	ev_io_stop (EV_A_ &sigev);
		1261
		1262	close (sigpipe [0]); sigpipe [0] = 0;
		1263	close (sigpipe [1]); sigpipe [1] = 0;
		1264
		1265	loop_destroy (EV_A);
		1266	}
		1267
		1268	void
		1269	ev_default_fork (void)
		1270	{
		1271	#if EV_MULTIPLICITY
		1272	struct ev_loop *loop = ev_default_loop_ptr;
		1273	#endif
		1274
		1275	if (backend)
		1276	postfork = 1;
		1277	}
		1278
		1279	/*****************************************************************************/
		1280
		1281	void
		1282	ev_invoke (EV_P_ void *w, int revents)
		1283	{
		1284	EV_CB_INVOKE ((W)w, revents);
		1285	}
		1286
		1287	void inline_speed
		1288	call_pending (EV_P)
		1289	{
		1290	int pri;
		1291
		1292	for (pri = NUMPRI; pri--; )
		1293	while (pendingcnt [pri])
		1294	{
		1295	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1296
		1297	if (expect_true (p->w))
		1298	{
		1299	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1300
		1301	p->w->pending = 0;
		1302	EV_CB_INVOKE (p->w, p->events);
		1303	}
284	}	1304	}
285
286	pendingcnt = 0;
287	}	1305	}
288		1306
289	static void	1307	void inline_size
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1308	timers_reify (EV_P)
291	{	1309	{
292	while (timercnt && timers [0]->at <= now)	1310	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1311	{
294	struct ev_timer *w = timers [0];	1312	ev_timer *w = (ev_timer *)timers [0];
		1313
		1314	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
295		1315
296	/* first reschedule or stop timer */	1316	/* first reschedule or stop timer */
297	if (w->repeat)	1317	if (w->repeat)
298	{	1318	{
299	if (w->is_abs)	1319	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;	1320
301	else
302	w->at = now + w->repeat;	1321	((WT)w)->at += w->repeat;
303		1322	if (((WT)w)->at < mn_now)
304	assert (w->at > now);	1323	((WT)w)->at = mn_now;
305		1324
306	downheap (timers, timercnt, 0);	1325	downheap (timers, timercnt, 0);
307	}	1326	}
308	else	1327	else
		1328	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1329
		1330	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1331	}
		1332	}
		1333
		1334	#if EV_PERIODIC_ENABLE
		1335	void inline_size
		1336	periodics_reify (EV_P)
		1337	{
		1338	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1339	{
		1340	ev_periodic *w = (ev_periodic *)periodics [0];
		1341
		1342	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1343
		1344	/* first reschedule or stop timer */
		1345	if (w->reschedule_cb)
309	{	1346	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1347	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
311	--timercnt; /* maybe pass by reference instead? */	1348	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1349	downheap (periodics, periodiccnt, 0);
312	}	1350	}
		1351	else if (w->interval)
		1352	{
		1353	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1354	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1355	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1356	downheap (periodics, periodiccnt, 0);
		1357	}
		1358	else
		1359	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1360
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1361	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1362	}
316	}	1363	}
317		1364
318	static void	1365	static void noinline
319	time_update ()	1366	periodics_reschedule (EV_P)
320	{	1367	{
321	int i;	1368	int i;
322	ev_now = ev_time ();
323		1369
324	if (have_monotonic)	1370	/* adjust periodics after time jump */
		1371	for (i = 0; i < periodiccnt; ++i)
		1372	{
		1373	ev_periodic *w = (ev_periodic *)periodics [i];
		1374
		1375	if (w->reschedule_cb)
		1376	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1377	else if (w->interval)
		1378	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
325	{	1379	}
326	ev_tstamp odiff = diff;
327		1380
328	/* detecting time jumps is much more difficult */	1381	/* now rebuild the heap */
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1382	for (i = periodiccnt >> 1; i--; )
		1383	downheap (periodics, periodiccnt, i);
		1384	}
		1385	#endif
		1386
		1387	#if EV_IDLE_ENABLE
		1388	void inline_size
		1389	idle_reify (EV_P)
		1390	{
		1391	if (expect_false (idleall))
		1392	{
		1393	int pri;
		1394
		1395	for (pri = NUMPRI; pri--; )
330	{	1396	{
		1397	if (pendingcnt [pri])
		1398	break;
		1399
		1400	if (idlecnt [pri])
		1401	{
		1402	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1403	break;
		1404	}
		1405	}
		1406	}
		1407	}
		1408	#endif
		1409
		1410	void inline_speed
		1411	time_update (EV_P_ ev_tstamp max_block)
		1412	{
		1413	int i;
		1414
		1415	#if EV_USE_MONOTONIC
		1416	if (expect_true (have_monotonic))
		1417	{
		1418	ev_tstamp odiff = rtmn_diff;
		1419
331	now = get_clock ();	1420	mn_now = get_clock ();
		1421
		1422	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1423	/* interpolate in the meantime */
		1424	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1425	{
		1426	ev_rt_now = rtmn_diff + mn_now;
		1427	return;
		1428	}
		1429
		1430	now_floor = mn_now;
		1431	ev_rt_now = ev_time ();
		1432
		1433	/* loop a few times, before making important decisions.
		1434	* on the choice of "4": one iteration isn't enough,
		1435	* in case we get preempted during the calls to
		1436	* ev_time and get_clock. a second call is almost guaranteed
		1437	* to succeed in that case, though. and looping a few more times
		1438	* doesn't hurt either as we only do this on time-jumps or
		1439	* in the unlikely event of having been preempted here.
		1440	*/
		1441	for (i = 4; --i; )
		1442	{
332	diff = ev_now - now;	1443	rtmn_diff = ev_rt_now - mn_now;
333		1444
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1445	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1446	return; /* all is well */
336		1447
337	ev_now = ev_time ();	1448	ev_rt_now = ev_time ();
		1449	mn_now = get_clock ();
		1450	now_floor = mn_now;
338	}	1451	}
339		1452
340	/* time jump detected, reschedule atimers */	1453	# if EV_PERIODIC_ENABLE
341	for (i = 0; i < atimercnt; ++i)	1454	periodics_reschedule (EV_A);
		1455	# endif
		1456	/* no timer adjustment, as the monotonic clock doesn't jump */
		1457	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1458	}
		1459	else
		1460	#endif
		1461	{
		1462	ev_rt_now = ev_time ();
		1463
		1464	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
342	{	1465	{
343	struct ev_timer *w = atimers [i];	1466	#if EV_PERIODIC_ENABLE
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1467	periodics_reschedule (EV_A);
		1468	#endif
		1469	/* adjust timers. this is easy, as the offset is the same for all of them */
		1470	for (i = 0; i < timercnt; ++i)
		1471	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1472	}
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		1473
354	now = ev_now;	1474	mn_now = ev_rt_now;
355	}	1475	}
356	}	1476	}
357		1477
358	int ev_loop_done;	1478	void
		1479	ev_ref (EV_P)
		1480	{
		1481	++activecnt;
		1482	}
359		1483
		1484	void
		1485	ev_unref (EV_P)
		1486	{
		1487	--activecnt;
		1488	}
		1489
		1490	static int loop_done;
		1491
		1492	void
360	void ev_loop (int flags)	1493	ev_loop (EV_P_ int flags)
361	{	1494	{
362	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1495	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1496	? EVUNLOOP_ONE
		1497	: EVUNLOOP_CANCEL;
		1498
		1499	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
364		1500
365	do	1501	do
366	{	1502	{
		1503	#ifndef _WIN32
		1504	if (expect_false (curpid)) /* penalise the forking check even more */
		1505	if (expect_false (getpid () != curpid))
		1506	{
		1507	curpid = getpid ();
		1508	postfork = 1;
		1509	}
		1510	#endif
		1511
		1512	#if EV_FORK_ENABLE
		1513	/* we might have forked, so queue fork handlers */
		1514	if (expect_false (postfork))
		1515	if (forkcnt)
		1516	{
		1517	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1518	call_pending (EV_A);
		1519	}
		1520	#endif
		1521
		1522	/* queue prepare watchers (and execute them) */
		1523	if (expect_false (preparecnt))
		1524	{
		1525	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1526	call_pending (EV_A);
		1527	}
		1528
		1529	if (expect_false (!activecnt))
		1530	break;
		1531
		1532	/* we might have forked, so reify kernel state if necessary */
		1533	if (expect_false (postfork))
		1534	loop_fork (EV_A);
		1535
367	/* update fd-related kernel structures */	1536	/* update fd-related kernel structures */
368	fd_reify ();	1537	fd_reify (EV_A);
369		1538
370	/* calculate blocking time */	1539	/* calculate blocking time */
371	if (flags & EVLOOP_NONBLOCK)	1540	{
372	block = 0.;	1541	ev_tstamp waittime = 0.;
373	else	1542	ev_tstamp sleeptime = 0.;
		1543
		1544	if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
374	{	1545	{
		1546	/* update time to cancel out callback processing overhead */
		1547	time_update (EV_A_ 1e100);
		1548
375	block = MAX_BLOCKTIME;	1549	waittime = MAX_BLOCKTIME;
376		1550
377	if (rtimercnt)	1551	if (timercnt)
378	{	1552	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1553	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1554	if (waittime > to) waittime = to;
381	}	1555	}
382		1556
		1557	#if EV_PERIODIC_ENABLE
383	if (atimercnt)	1558	if (periodiccnt)
384	{	1559	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1560	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1561	if (waittime > to) waittime = to;
387	}	1562	}
		1563	#endif
388		1564
389	if (block < 0.) block = 0.;	1565	if (expect_false (waittime < timeout_blocktime))
		1566	waittime = timeout_blocktime;
		1567
		1568	sleeptime = waittime - backend_fudge;
		1569
		1570	if (expect_true (sleeptime > io_blocktime))
		1571	sleeptime = io_blocktime;
		1572
		1573	if (sleeptime)
		1574	{
		1575	ev_sleep (sleeptime);
		1576	waittime -= sleeptime;
		1577	}
390	}	1578	}
391		1579
392	method_poll (block);	1580	++loop_count;
		1581	backend_poll (EV_A_ waittime);
393		1582
394	/* update ev_now, do magic */	1583	/* update ev_rt_now, do magic */
395	time_update ();	1584	time_update (EV_A_ waittime + sleeptime);
		1585	}
396		1586
397	/* put pending timers into pendign queue and reschedule them */	1587	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1588	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1589	#if EV_PERIODIC_ENABLE
400	/* relative timers second */	1590	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1591	#endif
402		1592
		1593	#if EV_IDLE_ENABLE
		1594	/* queue idle watchers unless other events are pending */
		1595	idle_reify (EV_A);
		1596	#endif
		1597
		1598	/* queue check watchers, to be executed first */
		1599	if (expect_false (checkcnt))
		1600	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1601
403	call_pending ();	1602	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1603
408	static void	1604	}
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1605	while (expect_true (activecnt && !loop_done));
		1606
		1607	if (loop_done == EVUNLOOP_ONE)
		1608	loop_done = EVUNLOOP_CANCEL;
		1609	}
		1610
		1611	void
		1612	ev_unloop (EV_P_ int how)
		1613	{
		1614	loop_done = how;
		1615	}
		1616
		1617	/*****************************************************************************/
		1618
		1619	void inline_size
		1620	wlist_add (WL *head, WL elem)
410	{	1621	{
411	elem->next = *head;	1622	elem->next = *head;
412	*head = elem;	1623	*head = elem;
413	}	1624	}
414		1625
415	static void	1626	void inline_size
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1627	wlist_del (WL *head, WL elem)
417	{	1628	{
418	while (*head)	1629	while (*head)
419	{	1630	{
420	if (*head == elem)	1631	if (*head == elem)
421	{	1632	{
…		…
425		1636
426	head = &(*head)->next;	1637	head = &(*head)->next;
427	}	1638	}
428	}	1639	}
429		1640
		1641	void inline_speed
		1642	clear_pending (EV_P_ W w)
		1643	{
		1644	if (w->pending)
		1645	{
		1646	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1647	w->pending = 0;
		1648	}
		1649	}
		1650
		1651	int
		1652	ev_clear_pending (EV_P_ void *w)
		1653	{
		1654	W w_ = (W)w;
		1655	int pending = w_->pending;
		1656
		1657	if (expect_true (pending))
		1658	{
		1659	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1660	w_->pending = 0;
		1661	p->w = 0;
		1662	return p->events;
		1663	}
		1664	else
		1665	return 0;
		1666	}
		1667
		1668	void inline_size
		1669	pri_adjust (EV_P_ W w)
		1670	{
		1671	int pri = w->priority;
		1672	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1673	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1674	w->priority = pri;
		1675	}
		1676
		1677	void inline_speed
		1678	ev_start (EV_P_ W w, int active)
		1679	{
		1680	pri_adjust (EV_A_ w);
		1681	w->active = active;
		1682	ev_ref (EV_A);
		1683	}
		1684
		1685	void inline_size
		1686	ev_stop (EV_P_ W w)
		1687	{
		1688	ev_unref (EV_A);
		1689	w->active = 0;
		1690	}
		1691
		1692	/*****************************************************************************/
		1693
		1694	void noinline
		1695	ev_io_start (EV_P_ ev_io *w)
		1696	{
		1697	int fd = w->fd;
		1698
		1699	if (expect_false (ev_is_active (w)))
		1700	return;
		1701
		1702	assert (("ev_io_start called with negative fd", fd >= 0));
		1703
		1704	ev_start (EV_A_ (W)w, 1);
		1705	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1706	wlist_add (&anfds[fd].head, (WL)w);
		1707
		1708	fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
		1709	w->events &= ~EV_IOFDSET;
		1710	}
		1711
		1712	void noinline
		1713	ev_io_stop (EV_P_ ev_io *w)
		1714	{
		1715	clear_pending (EV_A_ (W)w);
		1716	if (expect_false (!ev_is_active (w)))
		1717	return;
		1718
		1719	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1720
		1721	wlist_del (&anfds[w->fd].head, (WL)w);
		1722	ev_stop (EV_A_ (W)w);
		1723
		1724	fd_change (EV_A_ w->fd, 1);
		1725	}
		1726
		1727	void noinline
		1728	ev_timer_start (EV_P_ ev_timer *w)
		1729	{
		1730	if (expect_false (ev_is_active (w)))
		1731	return;
		1732
		1733	((WT)w)->at += mn_now;
		1734
		1735	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1736
		1737	ev_start (EV_A_ (W)w, ++timercnt);
		1738	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1739	timers [timercnt - 1] = (WT)w;
		1740	upheap (timers, timercnt - 1);
		1741
		1742	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1743	}
		1744
		1745	void noinline
		1746	ev_timer_stop (EV_P_ ev_timer *w)
		1747	{
		1748	clear_pending (EV_A_ (W)w);
		1749	if (expect_false (!ev_is_active (w)))
		1750	return;
		1751
		1752	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1753
		1754	{
		1755	int active = ((W)w)->active;
		1756
		1757	if (expect_true (--active < --timercnt))
		1758	{
		1759	timers [active] = timers [timercnt];
		1760	adjustheap (timers, timercnt, active);
		1761	}
		1762	}
		1763
		1764	((WT)w)->at -= mn_now;
		1765
		1766	ev_stop (EV_A_ (W)w);
		1767	}
		1768
		1769	void noinline
		1770	ev_timer_again (EV_P_ ev_timer *w)
		1771	{
		1772	if (ev_is_active (w))
		1773	{
		1774	if (w->repeat)
		1775	{
		1776	((WT)w)->at = mn_now + w->repeat;
		1777	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1778	}
		1779	else
		1780	ev_timer_stop (EV_A_ w);
		1781	}
		1782	else if (w->repeat)
		1783	{
		1784	w->at = w->repeat;
		1785	ev_timer_start (EV_A_ w);
		1786	}
		1787	}
		1788
		1789	#if EV_PERIODIC_ENABLE
		1790	void noinline
		1791	ev_periodic_start (EV_P_ ev_periodic *w)
		1792	{
		1793	if (expect_false (ev_is_active (w)))
		1794	return;
		1795
		1796	if (w->reschedule_cb)
		1797	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1798	else if (w->interval)
		1799	{
		1800	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1801	/* this formula differs from the one in periodic_reify because we do not always round up */
		1802	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1803	}
		1804	else
		1805	((WT)w)->at = w->offset;
		1806
		1807	ev_start (EV_A_ (W)w, ++periodiccnt);
		1808	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
		1809	periodics [periodiccnt - 1] = (WT)w;
		1810	upheap (periodics, periodiccnt - 1);
		1811
		1812	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1813	}
		1814
		1815	void noinline
		1816	ev_periodic_stop (EV_P_ ev_periodic *w)
		1817	{
		1818	clear_pending (EV_A_ (W)w);
		1819	if (expect_false (!ev_is_active (w)))
		1820	return;
		1821
		1822	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1823
		1824	{
		1825	int active = ((W)w)->active;
		1826
		1827	if (expect_true (--active < --periodiccnt))
		1828	{
		1829	periodics [active] = periodics [periodiccnt];
		1830	adjustheap (periodics, periodiccnt, active);
		1831	}
		1832	}
		1833
		1834	ev_stop (EV_A_ (W)w);
		1835	}
		1836
		1837	void noinline
		1838	ev_periodic_again (EV_P_ ev_periodic *w)
		1839	{
		1840	/* TODO: use adjustheap and recalculation */
		1841	ev_periodic_stop (EV_A_ w);
		1842	ev_periodic_start (EV_A_ w);
		1843	}
		1844	#endif
		1845
		1846	#ifndef SA_RESTART
		1847	# define SA_RESTART 0
		1848	#endif
		1849
		1850	void noinline
		1851	ev_signal_start (EV_P_ ev_signal *w)
		1852	{
		1853	#if EV_MULTIPLICITY
		1854	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1855	#endif
		1856	if (expect_false (ev_is_active (w)))
		1857	return;
		1858
		1859	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1860
		1861	{
		1862	#ifndef _WIN32
		1863	sigset_t full, prev;
		1864	sigfillset (&full);
		1865	sigprocmask (SIG_SETMASK, &full, &prev);
		1866	#endif
		1867
		1868	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1869
		1870	#ifndef _WIN32
		1871	sigprocmask (SIG_SETMASK, &prev, 0);
		1872	#endif
		1873	}
		1874
		1875	ev_start (EV_A_ (W)w, 1);
		1876	wlist_add (&signals [w->signum - 1].head, (WL)w);
		1877
		1878	if (!((WL)w)->next)
		1879	{
		1880	#if _WIN32
		1881	signal (w->signum, sighandler);
		1882	#else
		1883	struct sigaction sa;
		1884	sa.sa_handler = sighandler;
		1885	sigfillset (&sa.sa_mask);
		1886	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1887	sigaction (w->signum, &sa, 0);
		1888	#endif
		1889	}
		1890	}
		1891
		1892	void noinline
		1893	ev_signal_stop (EV_P_ ev_signal *w)
		1894	{
		1895	clear_pending (EV_A_ (W)w);
		1896	if (expect_false (!ev_is_active (w)))
		1897	return;
		1898
		1899	wlist_del (&signals [w->signum - 1].head, (WL)w);
		1900	ev_stop (EV_A_ (W)w);
		1901
		1902	if (!signals [w->signum - 1].head)
		1903	signal (w->signum, SIG_DFL);
		1904	}
		1905
		1906	void
		1907	ev_child_start (EV_P_ ev_child *w)
		1908	{
		1909	#if EV_MULTIPLICITY
		1910	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1911	#endif
		1912	if (expect_false (ev_is_active (w)))
		1913	return;
		1914
		1915	ev_start (EV_A_ (W)w, 1);
		1916	wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1917	}
		1918
		1919	void
		1920	ev_child_stop (EV_P_ ev_child *w)
		1921	{
		1922	clear_pending (EV_A_ (W)w);
		1923	if (expect_false (!ev_is_active (w)))
		1924	return;
		1925
		1926	wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1927	ev_stop (EV_A_ (W)w);
		1928	}
		1929
		1930	#if EV_STAT_ENABLE
		1931
		1932	# ifdef _WIN32
		1933	# undef lstat
		1934	# define lstat(a,b) _stati64 (a,b)
		1935	# endif
		1936
		1937	#define DEF_STAT_INTERVAL 5.0074891
		1938	#define MIN_STAT_INTERVAL 0.1074891
		1939
		1940	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1941
		1942	#if EV_USE_INOTIFY
		1943	# define EV_INOTIFY_BUFSIZE 8192
		1944
		1945	static void noinline
		1946	infy_add (EV_P_ ev_stat *w)
		1947	{
		1948	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);
		1949
		1950	if (w->wd < 0)
		1951	{
		1952	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1953
		1954	/* monitor some parent directory for speedup hints */
		1955	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1956	{
		1957	char path [4096];
		1958	strcpy (path, w->path);
		1959
		1960	do
		1961	{
		1962	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1963	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1964
		1965	char *pend = strrchr (path, '/');
		1966
		1967	if (!pend)
		1968	break; /* whoops, no '/', complain to your admin */
		1969
		1970	*pend = 0;
		1971	w->wd = inotify_add_watch (fs_fd, path, mask);
		1972	}
		1973	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1974	}
		1975	}
		1976	else
		1977	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1978
		1979	if (w->wd >= 0)
		1980	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1981	}
		1982
		1983	static void noinline
		1984	infy_del (EV_P_ ev_stat *w)
		1985	{
		1986	int slot;
		1987	int wd = w->wd;
		1988
		1989	if (wd < 0)
		1990	return;
		1991
		1992	w->wd = -2;
		1993	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1994	wlist_del (&fs_hash [slot].head, (WL)w);
		1995
		1996	/* remove this watcher, if others are watching it, they will rearm */
		1997	inotify_rm_watch (fs_fd, wd);
		1998	}
		1999
		2000	static void noinline
		2001	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		2002	{
		2003	if (slot < 0)
		2004	/* overflow, need to check for all hahs slots */
		2005	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2006	infy_wd (EV_A_ slot, wd, ev);
		2007	else
		2008	{
		2009	WL w_;
		2010
		2011	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		2012	{
		2013	ev_stat *w = (ev_stat *)w_;
		2014	w_ = w_->next; /* lets us remove this watcher and all before it */
		2015
		2016	if (w->wd == wd || wd == -1)
		2017	{
		2018	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		2019	{
		2020	w->wd = -1;
		2021	infy_add (EV_A_ w); /* re-add, no matter what */
		2022	}
		2023
		2024	stat_timer_cb (EV_A_ &w->timer, 0);
		2025	}
		2026	}
		2027	}
		2028	}
		2029
430	static void	2030	static void
431	ev_start (struct ev_watcher *w, int active)	2031	infy_cb (EV_P_ ev_io *w, int revents)
432	{	2032	{
433	w->pending = 0;	2033	char buf [EV_INOTIFY_BUFSIZE];
434	w->active = active;	2034	struct inotify_event *ev = (struct inotify_event *)buf;
		2035	int ofs;
		2036	int len = read (fs_fd, buf, sizeof (buf));
		2037
		2038	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		2039	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		2040	}
		2041
		2042	void inline_size
		2043	infy_init (EV_P)
		2044	{
		2045	if (fs_fd != -2)
		2046	return;
		2047
		2048	fs_fd = inotify_init ();
		2049
		2050	if (fs_fd >= 0)
		2051	{
		2052	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		2053	ev_set_priority (&fs_w, EV_MAXPRI);
		2054	ev_io_start (EV_A_ &fs_w);
		2055	}
		2056	}
		2057
		2058	void inline_size
		2059	infy_fork (EV_P)
		2060	{
		2061	int slot;
		2062
		2063	if (fs_fd < 0)
		2064	return;
		2065
		2066	close (fs_fd);
		2067	fs_fd = inotify_init ();
		2068
		2069	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		2070	{
		2071	WL w_ = fs_hash [slot].head;
		2072	fs_hash [slot].head = 0;
		2073
		2074	while (w_)
		2075	{
		2076	ev_stat *w = (ev_stat *)w_;
		2077	w_ = w_->next; /* lets us add this watcher */
		2078
		2079	w->wd = -1;
		2080
		2081	if (fs_fd >= 0)
		2082	infy_add (EV_A_ w); /* re-add, no matter what */
		2083	else
		2084	ev_timer_start (EV_A_ &w->timer);
		2085	}
		2086
		2087	}
		2088	}
		2089
		2090	#endif
		2091
		2092	void
		2093	ev_stat_stat (EV_P_ ev_stat *w)
		2094	{
		2095	if (lstat (w->path, &w->attr) < 0)
		2096	w->attr.st_nlink = 0;
		2097	else if (!w->attr.st_nlink)
		2098	w->attr.st_nlink = 1;
		2099	}
		2100
		2101	static void noinline
		2102	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		2103	{
		2104	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2105
		2106	/* we copy this here each the time so that */
		2107	/* prev has the old value when the callback gets invoked */
		2108	w->prev = w->attr;
		2109	ev_stat_stat (EV_A_ w);
		2110
		2111	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2112	if (
		2113	w->prev.st_dev != w->attr.st_dev
		2114	|| w->prev.st_ino != w->attr.st_ino
		2115	|| w->prev.st_mode != w->attr.st_mode
		2116	|| w->prev.st_nlink != w->attr.st_nlink
		2117	|| w->prev.st_uid != w->attr.st_uid
		2118	|| w->prev.st_gid != w->attr.st_gid
		2119	|| w->prev.st_rdev != w->attr.st_rdev
		2120	|| w->prev.st_size != w->attr.st_size
		2121	|| w->prev.st_atime != w->attr.st_atime
		2122	|| w->prev.st_mtime != w->attr.st_mtime
		2123	|| w->prev.st_ctime != w->attr.st_ctime
		2124	) {
		2125	#if EV_USE_INOTIFY
		2126	infy_del (EV_A_ w);
		2127	infy_add (EV_A_ w);
		2128	ev_stat_stat (EV_A_ w); /* avoid race... */
		2129	#endif
		2130
		2131	ev_feed_event (EV_A_ w, EV_STAT);
		2132	}
		2133	}
		2134
		2135	void
		2136	ev_stat_start (EV_P_ ev_stat *w)
		2137	{
		2138	if (expect_false (ev_is_active (w)))
		2139	return;
		2140
		2141	/* since we use memcmp, we need to clear any padding data etc. */
		2142	memset (&w->prev, 0, sizeof (ev_statdata));
		2143	memset (&w->attr, 0, sizeof (ev_statdata));
		2144
		2145	ev_stat_stat (EV_A_ w);
		2146
		2147	if (w->interval < MIN_STAT_INTERVAL)
		2148	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2149
		2150	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2151	ev_set_priority (&w->timer, ev_priority (w));
		2152
		2153	#if EV_USE_INOTIFY
		2154	infy_init (EV_A);
		2155
		2156	if (fs_fd >= 0)
		2157	infy_add (EV_A_ w);
		2158	else
		2159	#endif
		2160	ev_timer_start (EV_A_ &w->timer);
		2161
		2162	ev_start (EV_A_ (W)w, 1);
		2163	}
		2164
		2165	void
		2166	ev_stat_stop (EV_P_ ev_stat *w)
		2167	{
		2168	clear_pending (EV_A_ (W)w);
		2169	if (expect_false (!ev_is_active (w)))
		2170	return;
		2171
		2172	#if EV_USE_INOTIFY
		2173	infy_del (EV_A_ w);
		2174	#endif
		2175	ev_timer_stop (EV_A_ &w->timer);
		2176
		2177	ev_stop (EV_A_ (W)w);
		2178	}
		2179	#endif
		2180
		2181	#if EV_IDLE_ENABLE
		2182	void
		2183	ev_idle_start (EV_P_ ev_idle *w)
		2184	{
		2185	if (expect_false (ev_is_active (w)))
		2186	return;
		2187
		2188	pri_adjust (EV_A_ (W)w);
		2189
		2190	{
		2191	int active = ++idlecnt [ABSPRI (w)];
		2192
		2193	++idleall;
		2194	ev_start (EV_A_ (W)w, active);
		2195
		2196	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2197	idles [ABSPRI (w)][active - 1] = w;
		2198	}
		2199	}
		2200
		2201	void
		2202	ev_idle_stop (EV_P_ ev_idle *w)
		2203	{
		2204	clear_pending (EV_A_ (W)w);
		2205	if (expect_false (!ev_is_active (w)))
		2206	return;
		2207
		2208	{
		2209	int active = ((W)w)->active;
		2210
		2211	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2212	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2213
		2214	ev_stop (EV_A_ (W)w);
		2215	--idleall;
		2216	}
		2217	}
		2218	#endif
		2219
		2220	void
		2221	ev_prepare_start (EV_P_ ev_prepare *w)
		2222	{
		2223	if (expect_false (ev_is_active (w)))
		2224	return;
		2225
		2226	ev_start (EV_A_ (W)w, ++preparecnt);
		2227	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2228	prepares [preparecnt - 1] = w;
		2229	}
		2230
		2231	void
		2232	ev_prepare_stop (EV_P_ ev_prepare *w)
		2233	{
		2234	clear_pending (EV_A_ (W)w);
		2235	if (expect_false (!ev_is_active (w)))
		2236	return;
		2237
		2238	{
		2239	int active = ((W)w)->active;
		2240	prepares [active - 1] = prepares [--preparecnt];
		2241	((W)prepares [active - 1])->active = active;
		2242	}
		2243
		2244	ev_stop (EV_A_ (W)w);
		2245	}
		2246
		2247	void
		2248	ev_check_start (EV_P_ ev_check *w)
		2249	{
		2250	if (expect_false (ev_is_active (w)))
		2251	return;
		2252
		2253	ev_start (EV_A_ (W)w, ++checkcnt);
		2254	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2255	checks [checkcnt - 1] = w;
		2256	}
		2257
		2258	void
		2259	ev_check_stop (EV_P_ ev_check *w)
		2260	{
		2261	clear_pending (EV_A_ (W)w);
		2262	if (expect_false (!ev_is_active (w)))
		2263	return;
		2264
		2265	{
		2266	int active = ((W)w)->active;
		2267	checks [active - 1] = checks [--checkcnt];
		2268	((W)checks [active - 1])->active = active;
		2269	}
		2270
		2271	ev_stop (EV_A_ (W)w);
		2272	}
		2273
		2274	#if EV_EMBED_ENABLE
		2275	void noinline
		2276	ev_embed_sweep (EV_P_ ev_embed *w)
		2277	{
		2278	ev_loop (w->other, EVLOOP_NONBLOCK);
435	}	2279	}
436		2280
437	static void	2281	static void
438	ev_stop (struct ev_watcher *w)	2282	embed_io_cb (EV_P_ ev_io *io, int revents)
439	{	2283	{
440	if (w->pending)	2284	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
441	pendings [w->pending - 1].w = 0;
442		2285
443	w->active = 0;
444	/* nop */
445	}
446
447	void
448	evio_start (struct ev_io *w)
449	{
450	if (ev_is_active (w))	2286	if (ev_cb (w))
451	return;	2287	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	2288	else
		2289	ev_loop (w->other, EVLOOP_NONBLOCK);
		2290	}
		2291
		2292	static void
		2293	embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
		2294	{
		2295	ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
		2296
496	{	2297	{
497	w->at += now;	2298	struct ev_loop *loop = w->other;
498		2299
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	2300	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	{	2301	{
517	atimers [w->active - 1] = atimers [atimercnt];	2302	fd_reify (EV_A);
518	downheap (atimers, atimercnt, w->active - 1);	2303	ev_loop (EV_A_ EVLOOP_NONBLOCK);
519	}	2304	}
520	}	2305	}
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	}	2306	}
532		2307
533	void	2308	#if 0
534	evsignal_start (struct ev_signal *w)	2309	static void
		2310	embed_idle_cb (EV_P_ ev_idle *idle, int revents)
535	{	2311	{
		2312	ev_idle_stop (EV_A_ idle);
		2313	}
		2314	#endif
		2315
		2316	void
		2317	ev_embed_start (EV_P_ ev_embed *w)
		2318	{
536	if (ev_is_active (w))	2319	if (expect_false (ev_is_active (w)))
537	return;	2320	return;
538		2321
539	ev_start ((struct ev_watcher *)w, 1);	2322	{
540	array_needsize (signals, signalmax, w->signum, signals_init);	2323	struct ev_loop *loop = w->other;
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2324	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
542	}	2325	ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
		2326	}
543		2327
		2328	ev_set_priority (&w->io, ev_priority (w));
		2329	ev_io_start (EV_A_ &w->io);
		2330
		2331	ev_prepare_init (&w->prepare, embed_prepare_cb);
		2332	ev_set_priority (&w->prepare, EV_MINPRI);
		2333	ev_prepare_start (EV_A_ &w->prepare);
		2334
		2335	/*ev_idle_init (&w->idle, e,bed_idle_cb);*/
		2336
		2337	ev_start (EV_A_ (W)w, 1);
		2338	}
		2339
544	void	2340	void
545	evsignal_stop (struct ev_signal *w)	2341	ev_embed_stop (EV_P_ ev_embed *w)
546	{	2342	{
		2343	clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	2344	if (expect_false (!ev_is_active (w)))
548	return;	2345	return;
549		2346
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	2347	ev_io_stop (EV_A_ &w->io);
551	ev_stop ((struct ev_watcher *)w);	2348	ev_prepare_stop (EV_A_ &w->prepare);
		2349
		2350	ev_stop (EV_A_ (W)w);
552	}	2351	}
		2352	#endif
		2353
		2354	#if EV_FORK_ENABLE
		2355	void
		2356	ev_fork_start (EV_P_ ev_fork *w)
		2357	{
		2358	if (expect_false (ev_is_active (w)))
		2359	return;
		2360
		2361	ev_start (EV_A_ (W)w, ++forkcnt);
		2362	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2363	forks [forkcnt - 1] = w;
		2364	}
		2365
		2366	void
		2367	ev_fork_stop (EV_P_ ev_fork *w)
		2368	{
		2369	clear_pending (EV_A_ (W)w);
		2370	if (expect_false (!ev_is_active (w)))
		2371	return;
		2372
		2373	{
		2374	int active = ((W)w)->active;
		2375	forks [active - 1] = forks [--forkcnt];
		2376	((W)forks [active - 1])->active = active;
		2377	}
		2378
		2379	ev_stop (EV_A_ (W)w);
		2380	}
		2381	#endif
553		2382
554	/*****************************************************************************/	2383	/*****************************************************************************/
555	#if 1	2384
		2385	struct ev_once
		2386	{
		2387	ev_io io;
		2388	ev_timer to;
		2389	void (*cb)(int revents, void *arg);
		2390	void *arg;
		2391	};
556		2392
557	static void	2393	static void
558	sin_cb (struct ev_io *w, int revents)	2394	once_cb (EV_P_ struct ev_once *once, int revents)
559	{	2395	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2396	void (*cb)(int revents, void *arg) = once->cb;
		2397	void *arg = once->arg;
		2398
		2399	ev_io_stop (EV_A_ &once->io);
		2400	ev_timer_stop (EV_A_ &once->to);
		2401	ev_free (once);
		2402
		2403	cb (revents, arg);
561	}	2404	}
562		2405
563	static void	2406	static void
		2407	once_cb_io (EV_P_ ev_io *w, int revents)
		2408	{
		2409	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		2410	}
		2411
		2412	static void
564	ocb (struct ev_timer *w, int revents)	2413	once_cb_to (EV_P_ ev_timer *w, int revents)
565	{	2414	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2415	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}	2416	}
570		2417
571	int main (void)	2418	void
		2419	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
572	{	2420	{
573	struct ev_io sin;	2421	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
574		2422
575	ev_init (0);	2423	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	}	2424	{
594	#endif	2425	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;	2426	return;
604	}	2427	}
605		2428
606	#endif	2429	once->cb = cb;
		2430	once->arg = arg;
607		2431
		2432	ev_init (&once->io, once_cb_io);
		2433	if (fd >= 0)
		2434	{
		2435	ev_io_set (&once->io, fd, events);
		2436	ev_io_start (EV_A_ &once->io);
		2437	}
608		2438
		2439	ev_init (&once->to, once_cb_to);
		2440	if (timeout >= 0.)
		2441	{
		2442	ev_timer_set (&once->to, timeout, 0.);
		2443	ev_timer_start (EV_A_ &once->to);
		2444	}
		2445	}
609		2446
		2447	#if EV_MULTIPLICITY
		2448	#include "ev_wrap.h"
		2449	#endif
610		2450
		2451	#ifdef __cplusplus
		2452	}
		2453	#endif
		2454

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