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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.130 by root, Fri Nov 23 05:13:48 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	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# else
		47	# ifndef EV_USE_MONOTONIC
		48	# define EV_USE_MONOTONIC 0
		49	# endif
		50	# ifndef EV_USE_REALTIME
		51	# define EV_USE_REALTIME 0
		52	# endif
		53	# endif
		54
		55	# ifndef EV_USE_SELECT
		56	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		57	# define EV_USE_SELECT 1
		58	# else
		59	# define EV_USE_SELECT 0
		60	# endif
		61	# endif
		62
		63	# ifndef EV_USE_POLL
		64	# if HAVE_POLL && HAVE_POLL_H
		65	# define EV_USE_POLL 1
		66	# else
		67	# define EV_USE_POLL 0
		68	# endif
		69	# endif
		70
		71	# ifndef EV_USE_EPOLL
		72	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		73	# define EV_USE_EPOLL 1
		74	# else
		75	# define EV_USE_EPOLL 0
		76	# endif
		77	# endif
		78
		79	# ifndef EV_USE_KQUEUE
		80	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		81	# define EV_USE_KQUEUE 1
		82	# else
		83	# define EV_USE_KQUEUE 0
		84	# endif
		85	# endif
		86
		87	# ifndef EV_USE_PORT
		88	# if HAVE_PORT_H && HAVE_PORT_CREATE
		89	# define EV_USE_PORT 1
		90	# else
		91	# define EV_USE_PORT 0
		92	# endif
		93	# endif
		94
		95	#endif
		96
1	#include <math.h>	97	#include <math.h>
2	#include <stdlib.h>	98	#include <stdlib.h>
		99	#include <fcntl.h>
		100	#include <stddef.h>
3		101
4	#include <stdio.h>	102	#include <stdio.h>
5		103
6	#include <assert.h>	104	#include <assert.h>
7	#include <errno.h>	105	#include <errno.h>
8	#include <sys/time.h>	106	#include <sys/types.h>
9	#include <time.h>	107	#include <time.h>
10		108
		109	#include <signal.h>
		110
		111	#ifndef _WIN32
		112	# include <unistd.h>
		113	# include <sys/time.h>
		114	# include <sys/wait.h>
		115	#else
		116	# define WIN32_LEAN_AND_MEAN
		117	# include <windows.h>
		118	# ifndef EV_SELECT_IS_WINSOCKET
		119	# define EV_SELECT_IS_WINSOCKET 1
		120	# endif
		121	#endif
		122
		123	/**/
		124
		125	#ifndef EV_USE_MONOTONIC
		126	# define EV_USE_MONOTONIC 0
		127	#endif
		128
		129	#ifndef EV_USE_REALTIME
		130	# define EV_USE_REALTIME 0
		131	#endif
		132
		133	#ifndef EV_USE_SELECT
		134	# define EV_USE_SELECT 1
		135	#endif
		136
		137	#ifndef EV_USE_POLL
		138	# ifdef _WIN32
		139	# define EV_USE_POLL 0
		140	# else
		141	# define EV_USE_POLL 1
		142	# endif
		143	#endif
		144
		145	#ifndef EV_USE_EPOLL
		146	# define EV_USE_EPOLL 0
		147	#endif
		148
		149	#ifndef EV_USE_KQUEUE
		150	# define EV_USE_KQUEUE 0
		151	#endif
		152
		153	#ifndef EV_USE_PORT
		154	# define EV_USE_PORT 0
		155	#endif
		156
		157	/**/
		158
11	#ifdef CLOCK_MONOTONIC	159	#ifndef CLOCK_MONOTONIC
		160	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	161	# define EV_USE_MONOTONIC 0
13	#endif	162	#endif
14		163
15	#define HAVE_EPOLL 1	164	#ifndef CLOCK_REALTIME
		165	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	166	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	167	#endif
		168
		169	#if EV_SELECT_IS_WINSOCKET
		170	# include <winsock.h>
		171	#endif
		172
		173	/**/
18		174
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	175	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	176	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		177	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		178	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		179
		180	#ifdef EV_H
		181	# include EV_H
		182	#else
22	#include "ev.h"	183	# include "ev.h"
		184	#endif
23		185
		186	#if __GNUC__ >= 3
		187	# define expect(expr,value) __builtin_expect ((expr),(value))
		188	# define inline static inline
		189	#else
		190	# define expect(expr,value) (expr)
		191	# define inline static
		192	#endif
		193
		194	#define expect_false(expr) expect ((expr) != 0, 0)
		195	#define expect_true(expr) expect ((expr) != 0, 1)
		196
		197	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		198	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		199
		200	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		201	#define EMPTY2(a,b) /* used to suppress some warnings */
		202
24	struct ev_watcher {	203	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	204	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	205	typedef struct ev_watcher_time *WT;
30	};
31		206
32	static ev_tstamp now, diff; /* monotonic clock */	207	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		208
		209	#ifdef _WIN32
		210	# include "ev_win32.c"
		211	#endif
		212
		213	/*****************************************************************************/
		214
		215	static void (*syserr_cb)(const char *msg);
		216
		217	void ev_set_syserr_cb (void (*cb)(const char *msg))
		218	{
		219	syserr_cb = cb;
		220	}
		221
		222	static void
		223	syserr (const char *msg)
		224	{
		225	if (!msg)
		226	msg = "(libev) system error";
		227
		228	if (syserr_cb)
		229	syserr_cb (msg);
		230	else
		231	{
		232	perror (msg);
		233	abort ();
		234	}
		235	}
		236
		237	static void *(*alloc)(void *ptr, long size);
		238
		239	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		240	{
		241	alloc = cb;
		242	}
		243
		244	static void *
		245	ev_realloc (void *ptr, long size)
		246	{
		247	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		248
		249	if (!ptr && size)
		250	{
		251	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		252	abort ();
		253	}
		254
		255	return ptr;
		256	}
		257
		258	#define ev_malloc(size) ev_realloc (0, (size))
		259	#define ev_free(ptr) ev_realloc ((ptr), 0)
		260
		261	/*****************************************************************************/
		262
		263	typedef struct
		264	{
		265	WL head;
		266	unsigned char events;
		267	unsigned char reify;
		268	#if EV_SELECT_IS_WINSOCKET
		269	SOCKET handle;
		270	#endif
		271	} ANFD;
		272
		273	typedef struct
		274	{
		275	W w;
		276	int events;
		277	} ANPENDING;
		278
		279	#if EV_MULTIPLICITY
		280
		281	struct ev_loop
		282	{
		283	ev_tstamp ev_rt_now;
		284	#define ev_rt_now ((loop)->ev_rt_now)
		285	#define VAR(name,decl) decl;
		286	#include "ev_vars.h"
		287	#undef VAR
		288	};
		289	#include "ev_wrap.h"
		290
		291	static struct ev_loop default_loop_struct;
		292	struct ev_loop *ev_default_loop_ptr;
		293
		294	#else
		295
33	ev_tstamp ev_now;	296	ev_tstamp ev_rt_now;
34	int ev_method;	297	#define VAR(name,decl) static decl;
		298	#include "ev_vars.h"
		299	#undef VAR
35		300
36	static int have_monotonic; /* runtime */	301	static int ev_default_loop_ptr;
37		302
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	303	#endif
39	static void (*method_reify)(void);	304
40	static void (*method_poll)(ev_tstamp timeout);	305	/*****************************************************************************/
41		306
42	ev_tstamp	307	ev_tstamp
43	ev_time (void)	308	ev_time (void)
44	{	309	{
45	#if HAVE_REALTIME	310	#if EV_USE_REALTIME
46	struct timespec ts;	311	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	312	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	313	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	314	#else
50	struct timeval tv;	315	struct timeval tv;
51	gettimeofday (&tv, 0);	316	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	317	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	318	#endif
54	}	319	}
55		320
56	static ev_tstamp	321	inline ev_tstamp
57	get_clock (void)	322	get_clock (void)
58	{	323	{
59	#if HAVE_MONOTONIC	324	#if EV_USE_MONOTONIC
60	if (have_monotonic)	325	if (expect_true (have_monotonic))
61	{	326	{
62	struct timespec ts;	327	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	328	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	329	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	330	}
66	#endif	331	#endif
67		332
68	return ev_time ();	333	return ev_time ();
69	}	334	}
70		335
		336	#if EV_MULTIPLICITY
		337	ev_tstamp
		338	ev_now (EV_P)
		339	{
		340	return ev_rt_now;
		341	}
		342	#endif
		343
		344	#define array_roundsize(type,n) (((n) | 4) & ~3)
		345
71	#define array_needsize(base,cur,cnt,init) \	346	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	347	if (expect_false ((cnt) > cur)) \
73	{ \	348	{ \
74	int newcnt = cur ? cur << 1 : 16; \	349	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	350	do \
		351	{ \
		352	newcnt = array_roundsize (type, newcnt << 1); \
		353	} \
		354	while ((cnt) > newcnt); \
		355	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	356	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	357	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	358	cur = newcnt; \
79	}	359	}
80		360
81	typedef struct	361	#define array_slim(type,stem) \
82	{	362	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	363	{ \
84	unsigned char wev, rev; /* want, received event set */	364	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	365	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		366	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		367	}
86		368
87	static ANFD *anfds;	369	#define array_free(stem, idx) \
88	static int anfdmax;	370	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		371
90	static int *fdchanges;	372	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		373
93	static void	374	static void
94	anfds_init (ANFD *base, int count)	375	anfds_init (ANFD *base, int count)
95	{	376	{
96	while (count--)	377	while (count--)
97	{	378	{
98	base->head = 0;	379	base->head = 0;
99	base->wev = base->rev = EV_NONE;	380	base->events = EV_NONE;
		381	base->reify = 0;
		382
100	++base;	383	++base;
101	}	384	}
102	}	385	}
103		386
104	typedef struct	387	void
		388	ev_feed_event (EV_P_ void *w, int revents)
105	{	389	{
106	struct ev_watcher *w;	390	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		391
110	static ANPENDING *pendings;	392	if (expect_false (w_->pending))
111	static int pendingmax, pendingcnt;	393	{
		394	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		395	return;
		396	}
112		397
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	398	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	399	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
118	pendings [pendingcnt - 1].w = w;	400	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	401	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	402	}
121		403
122	static void	404	static void
		405	queue_events (EV_P_ W *events, int eventcnt, int type)
		406	{
		407	int i;
		408
		409	for (i = 0; i < eventcnt; ++i)
		410	ev_feed_event (EV_A_ events [i], type);
		411	}
		412
		413	inline void
123	fd_event (int fd, int events)	414	fd_event (EV_P_ int fd, int revents)
124	{	415	{
125	ANFD *anfd = anfds + fd;	416	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	417	struct ev_io *w;
127		418
128	for (w = anfd->head; w; w = w->next)	419	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	420	{
130	int ev = w->events & events;	421	int ev = w->events & revents;
131		422
132	if (ev)	423	if (ev)
133	event ((struct ev_watcher *)w, ev);	424	ev_feed_event (EV_A_ (W)w, ev);
		425	}
		426	}
		427
		428	void
		429	ev_feed_fd_event (EV_P_ int fd, int revents)
		430	{
		431	fd_event (EV_A_ fd, revents);
		432	}
		433
		434	/*****************************************************************************/
		435
		436	inline void
		437	fd_reify (EV_P)
		438	{
		439	int i;
		440
		441	for (i = 0; i < fdchangecnt; ++i)
		442	{
		443	int fd = fdchanges [i];
		444	ANFD *anfd = anfds + fd;
		445	struct ev_io *w;
		446
		447	int events = 0;
		448
		449	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		450	events |= w->events;
		451
		452	#if EV_SELECT_IS_WINSOCKET
		453	if (events)
		454	{
		455	unsigned long argp;
		456	anfd->handle = _get_osfhandle (fd);
		457	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		458	}
		459	#endif
		460
		461	anfd->reify = 0;
		462
		463	backend_modify (EV_A_ fd, anfd->events, events);
		464	anfd->events = events;
		465	}
		466
		467	fdchangecnt = 0;
		468	}
		469
		470	static void
		471	fd_change (EV_P_ int fd)
		472	{
		473	if (expect_false (anfds [fd].reify))
		474	return;
		475
		476	anfds [fd].reify = 1;
		477
		478	++fdchangecnt;
		479	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		480	fdchanges [fdchangecnt - 1] = fd;
		481	}
		482
		483	static void
		484	fd_kill (EV_P_ int fd)
		485	{
		486	struct ev_io *w;
		487
		488	while ((w = (struct ev_io *)anfds [fd].head))
		489	{
		490	ev_io_stop (EV_A_ w);
		491	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		492	}
		493	}
		494
		495	inline int
		496	fd_valid (int fd)
		497	{
		498	#ifdef _WIN32
		499	return _get_osfhandle (fd) != -1;
		500	#else
		501	return fcntl (fd, F_GETFD) != -1;
		502	#endif
		503	}
		504
		505	/* called on EBADF to verify fds */
		506	static void
		507	fd_ebadf (EV_P)
		508	{
		509	int fd;
		510
		511	for (fd = 0; fd < anfdmax; ++fd)
		512	if (anfds [fd].events)
		513	if (!fd_valid (fd) == -1 && errno == EBADF)
		514	fd_kill (EV_A_ fd);
		515	}
		516
		517	/* called on ENOMEM in select/poll to kill some fds and retry */
		518	static void
		519	fd_enomem (EV_P)
		520	{
		521	int fd;
		522
		523	for (fd = anfdmax; fd--; )
		524	if (anfds [fd].events)
		525	{
		526	fd_kill (EV_A_ fd);
		527	return;
134	}	528	}
135	}	529	}
136		530
137	static struct ev_timer **atimers;	531	/* usually called after fork if backend needs to re-arm all fds from scratch */
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void	532	static void
144	upheap (struct ev_timer **timers, int k)	533	fd_rearm_all (EV_P)
145	{	534	{
146	struct ev_timer *w = timers [k];	535	int fd;
147		536
		537	/* this should be highly optimised to not do anything but set a flag */
		538	for (fd = 0; fd < anfdmax; ++fd)
		539	if (anfds [fd].events)
		540	{
		541	anfds [fd].events = 0;
		542	fd_change (EV_A_ fd);
		543	}
		544	}
		545
		546	/*****************************************************************************/
		547
		548	static void
		549	upheap (WT *heap, int k)
		550	{
		551	WT w = heap [k];
		552
148	while (k && timers [k >> 1]->at > w->at)	553	while (k && heap [k >> 1]->at > w->at)
149	{	554	{
150	timers [k] = timers [k >> 1];	555	heap [k] = heap [k >> 1];
151	timers [k]->active = k + 1;	556	((W)heap [k])->active = k + 1;
152	k >>= 1;	557	k >>= 1;
153	}	558	}
154		559
155	timers [k] = w;	560	heap [k] = w;
156	timers [k]->active = k + 1;	561	((W)heap [k])->active = k + 1;
157		562
158	}	563	}
159		564
160	static void	565	static void
161	downheap (struct ev_timer **timers, int N, int k)	566	downheap (WT *heap, int N, int k)
162	{	567	{
163	struct ev_timer *w = timers [k];	568	WT w = heap [k];
164		569
165	while (k < (N >> 1))	570	while (k < (N >> 1))
166	{	571	{
167	int j = k << 1;	572	int j = k << 1;
168		573
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	574	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
170	++j;	575	++j;
171		576
172	if (w->at <= timers [j]->at)	577	if (w->at <= heap [j]->at)
173	break;	578	break;
174		579
175	timers [k] = timers [j];	580	heap [k] = heap [j];
176	timers [k]->active = k + 1;	581	((W)heap [k])->active = k + 1;
177	k = j;	582	k = j;
178	}	583	}
179		584
180	timers [k] = w;	585	heap [k] = w;
181	timers [k]->active = k + 1;	586	((W)heap [k])->active = k + 1;
182	}	587	}
183		588
184	static struct ev_signal **signals;	589	inline void
		590	adjustheap (WT *heap, int N, int k)
		591	{
		592	upheap (heap, k);
		593	downheap (heap, N, k);
		594	}
		595
		596	/*****************************************************************************/
		597
		598	typedef struct
		599	{
		600	WL head;
		601	sig_atomic_t volatile gotsig;
		602	} ANSIG;
		603
		604	static ANSIG *signals;
185	static int signalmax;	605	static int signalmax;
186		606
		607	static int sigpipe [2];
		608	static sig_atomic_t volatile gotsig;
		609	static struct ev_io sigev;
		610
187	static void	611	static void
188	signals_init (struct ev_signal **base, int count)	612	signals_init (ANSIG *base, int count)
189	{	613	{
190	while (count--)	614	while (count--)
191	*base++ = 0;	615	{
192	}	616	base->head = 0;
		617	base->gotsig = 0;
193		618
		619	++base;
		620	}
		621	}
		622
		623	static void
		624	sighandler (int signum)
		625	{
		626	#if _WIN32
		627	signal (signum, sighandler);
		628	#endif
		629
		630	signals [signum - 1].gotsig = 1;
		631
		632	if (!gotsig)
		633	{
		634	int old_errno = errno;
		635	gotsig = 1;
		636	write (sigpipe [1], &signum, 1);
		637	errno = old_errno;
		638	}
		639	}
		640
		641	void
		642	ev_feed_signal_event (EV_P_ int signum)
		643	{
		644	WL w;
		645
		646	#if EV_MULTIPLICITY
		647	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		648	#endif
		649
		650	--signum;
		651
		652	if (signum < 0 || signum >= signalmax)
		653	return;
		654
		655	signals [signum].gotsig = 0;
		656
		657	for (w = signals [signum].head; w; w = w->next)
		658	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		659	}
		660
		661	static void
		662	sigcb (EV_P_ struct ev_io *iow, int revents)
		663	{
		664	int signum;
		665
		666	read (sigpipe [0], &revents, 1);
		667	gotsig = 0;
		668
		669	for (signum = signalmax; signum--; )
		670	if (signals [signum].gotsig)
		671	ev_feed_signal_event (EV_A_ signum + 1);
		672	}
		673
		674	static void
		675	fd_intern (int fd)
		676	{
		677	#ifdef _WIN32
		678	int arg = 1;
		679	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		680	#else
		681	fcntl (fd, F_SETFD, FD_CLOEXEC);
		682	fcntl (fd, F_SETFL, O_NONBLOCK);
		683	#endif
		684	}
		685
		686	static void
		687	siginit (EV_P)
		688	{
		689	fd_intern (sigpipe [0]);
		690	fd_intern (sigpipe [1]);
		691
		692	ev_io_set (&sigev, sigpipe [0], EV_READ);
		693	ev_io_start (EV_A_ &sigev);
		694	ev_unref (EV_A); /* child watcher should not keep loop alive */
		695	}
		696
		697	/*****************************************************************************/
		698
		699	static struct ev_child *childs [PID_HASHSIZE];
		700
		701	#ifndef _WIN32
		702
		703	static struct ev_signal childev;
		704
		705	#ifndef WCONTINUED
		706	# define WCONTINUED 0
		707	#endif
		708
		709	static void
		710	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		711	{
		712	struct ev_child *w;
		713
		714	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		715	if (w->pid == pid || !w->pid)
		716	{
		717	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		718	w->rpid = pid;
		719	w->rstatus = status;
		720	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		721	}
		722	}
		723
		724	static void
		725	childcb (EV_P_ struct ev_signal *sw, int revents)
		726	{
		727	int pid, status;
		728
		729	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		730	{
		731	/* make sure we are called again until all childs have been reaped */
		732	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		733
		734	child_reap (EV_A_ sw, pid, pid, status);
		735	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		736	}
		737	}
		738
		739	#endif
		740
		741	/*****************************************************************************/
		742
		743	#if EV_USE_PORT
		744	# include "ev_port.c"
		745	#endif
		746	#if EV_USE_KQUEUE
		747	# include "ev_kqueue.c"
		748	#endif
194	#if HAVE_EPOLL	749	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	750	# include "ev_epoll.c"
196	#endif	751	#endif
		752	#if EV_USE_POLL
		753	# include "ev_poll.c"
		754	#endif
197	#if HAVE_SELECT	755	#if EV_USE_SELECT
198	# include "ev_select.c"	756	# include "ev_select.c"
199	#endif	757	#endif
200		758
201	int ev_init (int flags)	759	int
		760	ev_version_major (void)
202	{	761	{
		762	return EV_VERSION_MAJOR;
		763	}
		764
		765	int
		766	ev_version_minor (void)
		767	{
		768	return EV_VERSION_MINOR;
		769	}
		770
		771	/* return true if we are running with elevated privileges and should ignore env variables */
		772	static int
		773	enable_secure (void)
		774	{
		775	#ifdef _WIN32
		776	return 0;
		777	#else
		778	return getuid () != geteuid ()
		779	|| getgid () != getegid ();
		780	#endif
		781	}
		782
		783	unsigned int
		784	ev_supported_backends (void)
		785	{
		786	unsigned int flags = 0;
		787
		788	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		789	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		790	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		791	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		792	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		793
		794	return flags;
		795	}
		796
		797	unsigned int
		798	ev_recommended_backends (void)
		799	{
		800	unsigned int flags = ev_recommended_backends ();
		801
		802	#ifndef __NetBSD__
		803	/* kqueue is borked on everything but netbsd apparently */
		804	/* it usually doesn't work correctly on anything but sockets and pipes */
		805	flags &= ~EVBACKEND_KQUEUE;
		806	#endif
		807	#ifdef __APPLE__
		808	// flags &= ~EVBACKEND_KQUEUE; for documentation
		809	flags &= ~EVBACKEND_POLL;
		810	#endif
		811
		812	return flags;
		813	}
		814
		815	unsigned int
		816	ev_backend (EV_P)
		817	{
		818	return backend;
		819	}
		820
		821	static void
		822	loop_init (EV_P_ unsigned int flags)
		823	{
		824	if (!backend)
		825	{
203	#if HAVE_MONOTONIC	826	#if EV_USE_MONOTONIC
204	{	827	{
205	struct timespec ts;	828	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	829	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	830	have_monotonic = 1;
208	}	831	}
209	#endif	832	#endif
210		833
211	ev_now = ev_time ();	834	ev_rt_now = ev_time ();
212	now = get_clock ();	835	mn_now = get_clock ();
213	diff = ev_now - now;	836	now_floor = mn_now;
		837	rtmn_diff = ev_rt_now - mn_now;
214		838
		839	if (!(flags & EVFLAG_NOENV)
		840	&& !enable_secure ()
		841	&& getenv ("LIBEV_FLAGS"))
		842	flags = atoi (getenv ("LIBEV_FLAGS"));
		843
		844	if (!(flags & 0x0000ffffUL))
		845	flags |= ev_recommended_backends ();
		846
		847	backend = 0;
		848	#if EV_USE_PORT
		849	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		850	#endif
		851	#if EV_USE_KQUEUE
		852	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		853	#endif
215	#if HAVE_EPOLL	854	#if EV_USE_EPOLL
216	if (epoll_init (flags))	855	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
217	return ev_method;
218	#endif	856	#endif
		857	#if EV_USE_POLL
		858	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		859	#endif
219	#if HAVE_SELECT	860	#if EV_USE_SELECT
220	if (select_init (flags))	861	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
221	return ev_method;
222	#endif	862	#endif
223		863
224	ev_method = EVMETHOD_NONE;	864	ev_init (&sigev, sigcb);
225	return ev_method;	865	ev_set_priority (&sigev, EV_MAXPRI);
		866	}
226	}	867	}
227		868
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	epoll_postfork_child ();
240	#endif
241	}
242
243	static void	869	static void
244	call_pending ()	870	loop_destroy (EV_P)
245	{	871	{
246	int i;	872	int i;
247		873
248	for (i = 0; i < pendingcnt; ++i)	874	#if EV_USE_PORT
		875	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		876	#endif
		877	#if EV_USE_KQUEUE
		878	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		879	#endif
		880	#if EV_USE_EPOLL
		881	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		882	#endif
		883	#if EV_USE_POLL
		884	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		885	#endif
		886	#if EV_USE_SELECT
		887	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		888	#endif
		889
		890	for (i = NUMPRI; i--; )
		891	array_free (pending, [i]);
		892
		893	/* have to use the microsoft-never-gets-it-right macro */
		894	array_free (fdchange, EMPTY0);
		895	array_free (timer, EMPTY0);
		896	#if EV_PERIODICS
		897	array_free (periodic, EMPTY0);
		898	#endif
		899	array_free (idle, EMPTY0);
		900	array_free (prepare, EMPTY0);
		901	array_free (check, EMPTY0);
		902
		903	backend = 0;
		904	}
		905
		906	static void
		907	loop_fork (EV_P)
		908	{
		909	#if EV_USE_PORT
		910	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		911	#endif
		912	#if EV_USE_KQUEUE
		913	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		914	#endif
		915	#if EV_USE_EPOLL
		916	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		917	#endif
		918
		919	if (ev_is_active (&sigev))
		920	{
		921	/* default loop */
		922
		923	ev_ref (EV_A);
		924	ev_io_stop (EV_A_ &sigev);
		925	close (sigpipe [0]);
		926	close (sigpipe [1]);
		927
		928	while (pipe (sigpipe))
		929	syserr ("(libev) error creating pipe");
		930
		931	siginit (EV_A);
249	{	932	}
250	ANPENDING *p = pendings + i;
251		933
252	if (p->w)	934	postfork = 0;
		935	}
		936
		937	#if EV_MULTIPLICITY
		938	struct ev_loop *
		939	ev_loop_new (unsigned int flags)
		940	{
		941	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		942
		943	memset (loop, 0, sizeof (struct ev_loop));
		944
		945	loop_init (EV_A_ flags);
		946
		947	if (ev_backend (EV_A))
		948	return loop;
		949
		950	return 0;
		951	}
		952
		953	void
		954	ev_loop_destroy (EV_P)
		955	{
		956	loop_destroy (EV_A);
		957	ev_free (loop);
		958	}
		959
		960	void
		961	ev_loop_fork (EV_P)
		962	{
		963	postfork = 1;
		964	}
		965
		966	#endif
		967
		968	#if EV_MULTIPLICITY
		969	struct ev_loop *
		970	ev_default_loop_init (unsigned int flags)
		971	#else
		972	int
		973	ev_default_loop (unsigned int flags)
		974	#endif
		975	{
		976	if (sigpipe [0] == sigpipe [1])
		977	if (pipe (sigpipe))
		978	return 0;
		979
		980	if (!ev_default_loop_ptr)
		981	{
		982	#if EV_MULTIPLICITY
		983	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		984	#else
		985	ev_default_loop_ptr = 1;
		986	#endif
		987
		988	loop_init (EV_A_ flags);
		989
		990	if (ev_backend (EV_A))
253	{	991	{
254	p->w->pending = 0;	992	siginit (EV_A);
255	p->w->cb (p->w, p->events);	993
		994	#ifndef _WIN32
		995	ev_signal_init (&childev, childcb, SIGCHLD);
		996	ev_set_priority (&childev, EV_MAXPRI);
		997	ev_signal_start (EV_A_ &childev);
		998	ev_unref (EV_A); /* child watcher should not keep loop alive */
		999	#endif
256	}	1000	}
		1001	else
		1002	ev_default_loop_ptr = 0;
		1003	}
		1004
		1005	return ev_default_loop_ptr;
		1006	}
		1007
		1008	void
		1009	ev_default_destroy (void)
		1010	{
		1011	#if EV_MULTIPLICITY
		1012	struct ev_loop *loop = ev_default_loop_ptr;
		1013	#endif
		1014
		1015	#ifndef _WIN32
		1016	ev_ref (EV_A); /* child watcher */
		1017	ev_signal_stop (EV_A_ &childev);
		1018	#endif
		1019
		1020	ev_ref (EV_A); /* signal watcher */
		1021	ev_io_stop (EV_A_ &sigev);
		1022
		1023	close (sigpipe [0]); sigpipe [0] = 0;
		1024	close (sigpipe [1]); sigpipe [1] = 0;
		1025
		1026	loop_destroy (EV_A);
		1027	}
		1028
		1029	void
		1030	ev_default_fork (void)
		1031	{
		1032	#if EV_MULTIPLICITY
		1033	struct ev_loop *loop = ev_default_loop_ptr;
		1034	#endif
		1035
		1036	if (backend)
		1037	postfork = 1;
		1038	}
		1039
		1040	/*****************************************************************************/
		1041
		1042	static int
		1043	any_pending (EV_P)
		1044	{
		1045	int pri;
		1046
		1047	for (pri = NUMPRI; pri--; )
		1048	if (pendingcnt [pri])
		1049	return 1;
		1050
		1051	return 0;
		1052	}
		1053
		1054	inline void
		1055	call_pending (EV_P)
		1056	{
		1057	int pri;
		1058
		1059	for (pri = NUMPRI; pri--; )
		1060	while (pendingcnt [pri])
		1061	{
		1062	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1063
		1064	if (expect_true (p->w))
		1065	{
		1066	p->w->pending = 0;
		1067	EV_CB_INVOKE (p->w, p->events);
		1068	}
257	}	1069	}
258
259	pendingcnt = 0;
260	}	1070	}
261		1071
262	static void	1072	inline void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1073	timers_reify (EV_P)
264	{	1074	{
265	while (timercnt && timers [0]->at <= now)	1075	while (timercnt && ((WT)timers [0])->at <= mn_now)
266	{	1076	{
267	struct ev_timer *w = timers [0];	1077	struct ev_timer *w = timers [0];
		1078
		1079	assert (("inactive timer on timer heap detected", ev_is_active (w)));
268		1080
269	/* first reschedule or stop timer */	1081	/* first reschedule or stop timer */
270	if (w->repeat)	1082	if (w->repeat)
271	{	1083	{
272	if (w->is_abs)	1084	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1085
274	else
275	w->at = now + w->repeat;	1086	((WT)w)->at += w->repeat;
		1087	if (((WT)w)->at < mn_now)
		1088	((WT)w)->at = mn_now;
276		1089
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	1090	downheap ((WT *)timers, timercnt, 0);
280	}	1091	}
281	else	1092	else
		1093	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1094
		1095	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1096	}
		1097	}
		1098
		1099	#if EV_PERIODICS
		1100	inline void
		1101	periodics_reify (EV_P)
		1102	{
		1103	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1104	{
		1105	struct ev_periodic *w = periodics [0];
		1106
		1107	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1108
		1109	/* first reschedule or stop timer */
		1110	if (w->reschedule_cb)
282	{	1111	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	1112	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
284	--timercnt; /* maybe pass by reference instead? */	1113	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1114	downheap ((WT *)periodics, periodiccnt, 0);
285	}	1115	}
		1116	else if (w->interval)
		1117	{
		1118	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1119	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1120	downheap ((WT *)periodics, periodiccnt, 0);
		1121	}
		1122	else
		1123	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
286		1124
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	1125	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
288	}	1126	}
289	}	1127	}
290		1128
291	static void	1129	static void
292	time_update ()	1130	periodics_reschedule (EV_P)
293	{	1131	{
294	int i;	1132	int i;
		1133
		1134	/* adjust periodics after time jump */
		1135	for (i = 0; i < periodiccnt; ++i)
		1136	{
		1137	struct ev_periodic *w = periodics [i];
		1138
		1139	if (w->reschedule_cb)
		1140	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1141	else if (w->interval)
		1142	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1143	}
		1144
		1145	/* now rebuild the heap */
		1146	for (i = periodiccnt >> 1; i--; )
		1147	downheap ((WT *)periodics, periodiccnt, i);
		1148	}
		1149	#endif
		1150
		1151	inline int
		1152	time_update_monotonic (EV_P)
		1153	{
		1154	mn_now = get_clock ();
		1155
		1156	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1157	{
		1158	ev_rt_now = rtmn_diff + mn_now;
		1159	return 0;
		1160	}
		1161	else
		1162	{
		1163	now_floor = mn_now;
295	ev_now = ev_time ();	1164	ev_rt_now = ev_time ();
296		1165	return 1;
297	if (have_monotonic)
298	{	1166	}
299	ev_tstamp odiff = diff;	1167	}
300		1168
301	/* detecting time jumps is much more difficult */	1169	inline void
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1170	time_update (EV_P)
		1171	{
		1172	int i;
		1173
		1174	#if EV_USE_MONOTONIC
		1175	if (expect_true (have_monotonic))
		1176	{
		1177	if (time_update_monotonic (EV_A))
303	{	1178	{
304	now = get_clock ();	1179	ev_tstamp odiff = rtmn_diff;
		1180
		1181	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1182	{
305	diff = ev_now - now;	1183	rtmn_diff = ev_rt_now - mn_now;
306		1184
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1185	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
308	return; /* all is well */	1186	return; /* all is well */
309		1187
310	ev_now = ev_time ();	1188	ev_rt_now = ev_time ();
		1189	mn_now = get_clock ();
		1190	now_floor = mn_now;
		1191	}
		1192
		1193	# if EV_PERIODICS
		1194	periodics_reschedule (EV_A);
		1195	# endif
		1196	/* no timer adjustment, as the monotonic clock doesn't jump */
		1197	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
311	}	1198	}
		1199	}
		1200	else
		1201	#endif
		1202	{
		1203	ev_rt_now = ev_time ();
312		1204
313	/* time jump detected, reschedule atimers */	1205	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
314	for (i = 0; i < atimercnt; ++i)
315	{	1206	{
316	struct ev_timer *w = atimers [i];	1207	#if EV_PERIODICS
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1208	periodics_reschedule (EV_A);
		1209	#endif
		1210
		1211	/* adjust timers. this is easy, as the offset is the same for all */
		1212	for (i = 0; i < timercnt; ++i)
		1213	((WT)timers [i])->at += ev_rt_now - mn_now;
318	}	1214	}
319	}
320	else
321	{
322	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323	/* time jump detected, adjust rtimers */
324	for (i = 0; i < rtimercnt; ++i)
325	rtimers [i]->at += ev_now - now;
326		1215
327	now = ev_now;	1216	mn_now = ev_rt_now;
328	}	1217	}
329	}	1218	}
330		1219
331	int ev_loop_done;	1220	void
		1221	ev_ref (EV_P)
		1222	{
		1223	++activecnt;
		1224	}
332		1225
		1226	void
		1227	ev_unref (EV_P)
		1228	{
		1229	--activecnt;
		1230	}
		1231
		1232	static int loop_done;
		1233
		1234	void
333	void ev_loop (int flags)	1235	ev_loop (EV_P_ int flags)
334	{	1236	{
335	double block;	1237	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	1238	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
337		1239
338	do	1240	while (activecnt)
339	{	1241	{
		1242	/* queue check watchers (and execute them) */
		1243	if (expect_false (preparecnt))
		1244	{
		1245	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1246	call_pending (EV_A);
		1247	}
		1248
		1249	/* we might have forked, so reify kernel state if necessary */
		1250	if (expect_false (postfork))
		1251	loop_fork (EV_A);
		1252
340	/* update fd-related kernel structures */	1253	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	1254	fd_reify (EV_A);
342		1255
343	/* calculate blocking time */	1256	/* calculate blocking time */
		1257
		1258	/* we only need this for !monotonic clock or timers, but as we basically
		1259	always have timers, we just calculate it always */
		1260	#if EV_USE_MONOTONIC
		1261	if (expect_true (have_monotonic))
		1262	time_update_monotonic (EV_A);
		1263	else
		1264	#endif
		1265	{
		1266	ev_rt_now = ev_time ();
		1267	mn_now = ev_rt_now;
		1268	}
		1269
344	if (flags & EVLOOP_NONBLOCK)	1270	if (flags & EVLOOP_NONBLOCK || idlecnt)
345	block = 0.;	1271	block = 0.;
346	else	1272	else
347	{	1273	{
348	block = MAX_BLOCKTIME;	1274	block = MAX_BLOCKTIME;
349		1275
350	if (rtimercnt)	1276	if (timercnt)
351	{	1277	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1278	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
353	if (block > to) block = to;	1279	if (block > to) block = to;
354	}	1280	}
355		1281
		1282	#if EV_PERIODICS
356	if (atimercnt)	1283	if (periodiccnt)
357	{	1284	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1285	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
359	if (block > to) block = to;	1286	if (block > to) block = to;
360	}	1287	}
		1288	#endif
361		1289
362	if (block < 0.) block = 0.;	1290	if (expect_false (block < 0.)) block = 0.;
363	}	1291	}
364		1292
365	method_poll (block);	1293	backend_poll (EV_A_ block);
366		1294
367	/* update ev_now, do magic */	1295	/* update ev_rt_now, do magic */
368	time_update ();	1296	time_update (EV_A);
369		1297
370	/* put pending timers into pendign queue and reschedule them */	1298	/* queue pending timers and reschedule them */
371	/* absolute timers first */	1299	timers_reify (EV_A); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	1300	#if EV_PERIODICS
373	/* relative timers second */	1301	periodics_reify (EV_A); /* absolute timers called first */
374	timers_reify (rtimers, rtimercnt, now);	1302	#endif
375		1303
		1304	/* queue idle watchers unless io or timers are pending */
		1305	if (idlecnt && !any_pending (EV_A))
		1306	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1307
		1308	/* queue check watchers, to be executed first */
		1309	if (expect_false (checkcnt))
		1310	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1311
376	call_pending ();	1312	call_pending (EV_A);
377	}
378	while (!ev_loop_done);
379	}
380		1313
381	static void	1314	if (expect_false (loop_done))
382	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1315	break;
		1316	}
		1317
		1318	if (loop_done != 2)
		1319	loop_done = 0;
		1320	}
		1321
		1322	void
		1323	ev_unloop (EV_P_ int how)
		1324	{
		1325	loop_done = how;
		1326	}
		1327
		1328	/*****************************************************************************/
		1329
		1330	inline void
		1331	wlist_add (WL *head, WL elem)
383	{	1332	{
384	elem->next = *head;	1333	elem->next = *head;
385	*head = elem;	1334	*head = elem;
386	}	1335	}
387		1336
388	static void	1337	inline void
389	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1338	wlist_del (WL *head, WL elem)
390	{	1339	{
391	while (*head)	1340	while (*head)
392	{	1341	{
393	if (*head == elem)	1342	if (*head == elem)
394	{	1343	{
…		…
398		1347
399	head = &(*head)->next;	1348	head = &(*head)->next;
400	}	1349	}
401	}	1350	}
402		1351
403	static void	1352	inline void
404	ev_start (struct ev_watcher *w, int active)	1353	ev_clear_pending (EV_P_ W w)
405	{	1354	{
		1355	if (w->pending)
		1356	{
		1357	pendings [ABSPRI (w)][w->pending - 1].w = 0;
406	w->pending = 0;	1358	w->pending = 0;
		1359	}
		1360	}
		1361
		1362	inline void
		1363	ev_start (EV_P_ W w, int active)
		1364	{
		1365	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1366	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1367
407	w->active = active;	1368	w->active = active;
		1369	ev_ref (EV_A);
408	}	1370	}
409		1371
410	static void	1372	inline void
411	ev_stop (struct ev_watcher *w)	1373	ev_stop (EV_P_ W w)
412	{	1374	{
413	if (w->pending)	1375	ev_unref (EV_A);
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	1376	w->active = 0;
417	/* nop */
418	}	1377	}
419		1378
		1379	/*****************************************************************************/
		1380
420	void	1381	void
421	evio_start (struct ev_io *w)	1382	ev_io_start (EV_P_ struct ev_io *w)
		1383	{
		1384	int fd = w->fd;
		1385
		1386	if (expect_false (ev_is_active (w)))
		1387	return;
		1388
		1389	assert (("ev_io_start called with negative fd", fd >= 0));
		1390
		1391	ev_start (EV_A_ (W)w, 1);
		1392	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1393	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1394
		1395	fd_change (EV_A_ fd);
		1396	}
		1397
		1398	void
		1399	ev_io_stop (EV_P_ struct ev_io *w)
		1400	{
		1401	ev_clear_pending (EV_A_ (W)w);
		1402	if (expect_false (!ev_is_active (w)))
		1403	return;
		1404
		1405	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1406
		1407	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1408	ev_stop (EV_A_ (W)w);
		1409
		1410	fd_change (EV_A_ w->fd);
		1411	}
		1412
		1413	void
		1414	ev_timer_start (EV_P_ struct ev_timer *w)
		1415	{
		1416	if (expect_false (ev_is_active (w)))
		1417	return;
		1418
		1419	((WT)w)->at += mn_now;
		1420
		1421	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1422
		1423	ev_start (EV_A_ (W)w, ++timercnt);
		1424	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1425	timers [timercnt - 1] = w;
		1426	upheap ((WT *)timers, timercnt - 1);
		1427
		1428	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1429	}
		1430
		1431	void
		1432	ev_timer_stop (EV_P_ struct ev_timer *w)
		1433	{
		1434	ev_clear_pending (EV_A_ (W)w);
		1435	if (expect_false (!ev_is_active (w)))
		1436	return;
		1437
		1438	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1439
		1440	if (expect_true (((W)w)->active < timercnt--))
		1441	{
		1442	timers [((W)w)->active - 1] = timers [timercnt];
		1443	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1444	}
		1445
		1446	((WT)w)->at -= mn_now;
		1447
		1448	ev_stop (EV_A_ (W)w);
		1449	}
		1450
		1451	void
		1452	ev_timer_again (EV_P_ struct ev_timer *w)
422	{	1453	{
423	if (ev_is_active (w))	1454	if (ev_is_active (w))
		1455	{
		1456	if (w->repeat)
		1457	{
		1458	((WT)w)->at = mn_now + w->repeat;
		1459	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1460	}
		1461	else
		1462	ev_timer_stop (EV_A_ w);
		1463	}
		1464	else if (w->repeat)
		1465	{
		1466	w->at = w->repeat;
		1467	ev_timer_start (EV_A_ w);
		1468	}
		1469	}
		1470
		1471	#if EV_PERIODICS
		1472	void
		1473	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1474	{
		1475	if (expect_false (ev_is_active (w)))
424	return;	1476	return;
425		1477
426	int fd = w->fd;	1478	if (w->reschedule_cb)
		1479	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1480	else if (w->interval)
		1481	{
		1482	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1483	/* this formula differs from the one in periodic_reify because we do not always round up */
		1484	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1485	}
427		1486
428	ev_start ((struct ev_watcher *)w, 1);	1487	ev_start (EV_A_ (W)w, ++periodiccnt);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1488	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
430	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1489	periodics [periodiccnt - 1] = w;
		1490	upheap ((WT *)periodics, periodiccnt - 1);
431		1491
432	++fdchangecnt;	1492	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	1493	}
436		1494
437	void	1495	void
438	evio_stop (struct ev_io *w)	1496	ev_periodic_stop (EV_P_ struct ev_periodic *w)
439	{	1497	{
		1498	ev_clear_pending (EV_A_ (W)w);
440	if (!ev_is_active (w))	1499	if (expect_false (!ev_is_active (w)))
441	return;	1500	return;
442		1501
443	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1502	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
444	ev_stop ((struct ev_watcher *)w);
445		1503
446	++fdchangecnt;	1504	if (expect_true (((W)w)->active < periodiccnt--))
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1505	{
448	fdchanges [fdchangecnt - 1] = w->fd;	1506	periodics [((W)w)->active - 1] = periodics [periodiccnt];
449	}	1507	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1508	}
450		1509
		1510	ev_stop (EV_A_ (W)w);
		1511	}
		1512
451	void	1513	void
		1514	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1515	{
		1516	/* TODO: use adjustheap and recalculation */
		1517	ev_periodic_stop (EV_A_ w);
		1518	ev_periodic_start (EV_A_ w);
		1519	}
		1520	#endif
		1521
		1522	void
452	evtimer_start (struct ev_timer *w)	1523	ev_idle_start (EV_P_ struct ev_idle *w)
453	{	1524	{
454	if (ev_is_active (w))	1525	if (expect_false (ev_is_active (w)))
455	return;	1526	return;
456		1527
457	if (w->is_abs)	1528	ev_start (EV_A_ (W)w, ++idlecnt);
458	{	1529	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
459	/* this formula differs from the one in timer_reify becuse we do not round up */	1530	idles [idlecnt - 1] = w;
460	if (w->repeat)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
462
463	ev_start ((struct ev_watcher *)w, ++atimercnt);
464	array_needsize (atimers, atimermax, atimercnt, );
465	atimers [atimercnt - 1] = w;
466	upheap (atimers, atimercnt - 1);
467	}
468	else
469	{
470	w->at += now;
471
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);
473	array_needsize (rtimers, rtimermax, rtimercnt, );
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}	1531	}
479		1532
480	void	1533	void
481	evtimer_stop (struct ev_timer *w)	1534	ev_idle_stop (EV_P_ struct ev_idle *w)
482	{	1535	{
		1536	ev_clear_pending (EV_A_ (W)w);
483	if (!ev_is_active (w))	1537	if (expect_false (!ev_is_active (w)))
484	return;	1538	return;
485		1539
486	if (w->is_abs)	1540	idles [((W)w)->active - 1] = idles [--idlecnt];
487	{	1541	ev_stop (EV_A_ (W)w);
488	if (w->active < atimercnt--)
489	{
490	atimers [w->active - 1] = atimers [atimercnt];
491	downheap (atimers, atimercnt, w->active - 1);
492	}
493	}
494	else
495	{
496	if (w->active < rtimercnt--)
497	{
498	rtimers [w->active - 1] = rtimers [rtimercnt];
499	downheap (rtimers, rtimercnt, w->active - 1);
500	}
501	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1542	}
505		1543
506	void	1544	void
507	evsignal_start (struct ev_signal *w)	1545	ev_prepare_start (EV_P_ struct ev_prepare *w)
508	{	1546	{
509	if (ev_is_active (w))	1547	if (expect_false (ev_is_active (w)))
510	return;	1548	return;
511		1549
512	ev_start ((struct ev_watcher *)w, 1);	1550	ev_start (EV_A_ (W)w, ++preparecnt);
513	array_needsize (signals, signalmax, w->signum, signals_init);	1551	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
514	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1552	prepares [preparecnt - 1] = w;
515	}	1553	}
516		1554
517	void	1555	void
518	evsignal_stop (struct ev_signal *w)	1556	ev_prepare_stop (EV_P_ struct ev_prepare *w)
519	{	1557	{
		1558	ev_clear_pending (EV_A_ (W)w);
520	if (!ev_is_active (w))	1559	if (expect_false (!ev_is_active (w)))
521	return;	1560	return;
522		1561
523	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1562	prepares [((W)w)->active - 1] = prepares [--preparecnt];
524	ev_stop ((struct ev_watcher *)w);	1563	ev_stop (EV_A_ (W)w);
		1564	}
		1565
		1566	void
		1567	ev_check_start (EV_P_ struct ev_check *w)
		1568	{
		1569	if (expect_false (ev_is_active (w)))
		1570	return;
		1571
		1572	ev_start (EV_A_ (W)w, ++checkcnt);
		1573	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1574	checks [checkcnt - 1] = w;
		1575	}
		1576
		1577	void
		1578	ev_check_stop (EV_P_ struct ev_check *w)
		1579	{
		1580	ev_clear_pending (EV_A_ (W)w);
		1581	if (expect_false (!ev_is_active (w)))
		1582	return;
		1583
		1584	checks [((W)w)->active - 1] = checks [--checkcnt];
		1585	ev_stop (EV_A_ (W)w);
		1586	}
		1587
		1588	#ifndef SA_RESTART
		1589	# define SA_RESTART 0
		1590	#endif
		1591
		1592	void
		1593	ev_signal_start (EV_P_ struct ev_signal *w)
		1594	{
		1595	#if EV_MULTIPLICITY
		1596	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1597	#endif
		1598	if (expect_false (ev_is_active (w)))
		1599	return;
		1600
		1601	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1602
		1603	ev_start (EV_A_ (W)w, 1);
		1604	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1605	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1606
		1607	if (!((WL)w)->next)
		1608	{
		1609	#if _WIN32
		1610	signal (w->signum, sighandler);
		1611	#else
		1612	struct sigaction sa;
		1613	sa.sa_handler = sighandler;
		1614	sigfillset (&sa.sa_mask);
		1615	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1616	sigaction (w->signum, &sa, 0);
		1617	#endif
		1618	}
		1619	}
		1620
		1621	void
		1622	ev_signal_stop (EV_P_ struct ev_signal *w)
		1623	{
		1624	ev_clear_pending (EV_A_ (W)w);
		1625	if (expect_false (!ev_is_active (w)))
		1626	return;
		1627
		1628	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1629	ev_stop (EV_A_ (W)w);
		1630
		1631	if (!signals [w->signum - 1].head)
		1632	signal (w->signum, SIG_DFL);
		1633	}
		1634
		1635	void
		1636	ev_child_start (EV_P_ struct ev_child *w)
		1637	{
		1638	#if EV_MULTIPLICITY
		1639	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1640	#endif
		1641	if (expect_false (ev_is_active (w)))
		1642	return;
		1643
		1644	ev_start (EV_A_ (W)w, 1);
		1645	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1646	}
		1647
		1648	void
		1649	ev_child_stop (EV_P_ struct ev_child *w)
		1650	{
		1651	ev_clear_pending (EV_A_ (W)w);
		1652	if (expect_false (!ev_is_active (w)))
		1653	return;
		1654
		1655	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1656	ev_stop (EV_A_ (W)w);
525	}	1657	}
526		1658
527	/*****************************************************************************/	1659	/*****************************************************************************/
528	#if 1
529		1660
530	static void	1661	struct ev_once
531	sin_cb (struct ev_io *w, int revents)
532	{	1662	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
534	}
535
536	static void
537	ocb (struct ev_timer *w, int revents)
538	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540	evtimer_stop (w);
541	evtimer_start (w);
542	}
543
544	int main (void)
545	{
546	struct ev_io sin;	1663	struct ev_io io;
547
548	ev_init (0);
549
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);
552	evio_start (&sin);
553
554	struct ev_timer t[10000];
555
556	#if 1
557	int i;
558	for (i = 0; i < 10000; ++i)
559	{
560	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);
563	evtimer_start (w);
564	if (drand48 () < 0.5)
565	evtimer_stop (w);
566	}
567	#endif
568
569	struct ev_timer t1;	1664	struct ev_timer to;
570	evw_init (&t1, ocb, 0);	1665	void (*cb)(int revents, void *arg);
571	evtimer_set_abs (&t1, 5, 10);	1666	void *arg;
572	evtimer_start (&t1);	1667	};
573		1668
574	ev_loop (0);	1669	static void
		1670	once_cb (EV_P_ struct ev_once *once, int revents)
		1671	{
		1672	void (*cb)(int revents, void *arg) = once->cb;
		1673	void *arg = once->arg;
575		1674
		1675	ev_io_stop (EV_A_ &once->io);
		1676	ev_timer_stop (EV_A_ &once->to);
		1677	ev_free (once);
		1678
		1679	cb (revents, arg);
		1680	}
		1681
		1682	static void
		1683	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1684	{
		1685	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1686	}
		1687
		1688	static void
		1689	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1690	{
		1691	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1692	}
		1693
		1694	void
		1695	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1696	{
		1697	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1698
		1699	if (expect_false (!once))
		1700	{
		1701	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
576	return 0;	1702	return;
577	}	1703	}
578		1704
579	#endif	1705	once->cb = cb;
		1706	once->arg = arg;
580		1707
		1708	ev_init (&once->io, once_cb_io);
		1709	if (fd >= 0)
		1710	{
		1711	ev_io_set (&once->io, fd, events);
		1712	ev_io_start (EV_A_ &once->io);
		1713	}
581		1714
		1715	ev_init (&once->to, once_cb_to);
		1716	if (timeout >= 0.)
		1717	{
		1718	ev_timer_set (&once->to, timeout, 0.);
		1719	ev_timer_start (EV_A_ &once->to);
		1720	}
		1721	}
582		1722
		1723	#ifdef __cplusplus
		1724	}
		1725	#endif
583		1726

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