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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.127 by root, Sun Nov 18 02:17:57 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
		104	#include <assert.h>
6	#include <errno.h>	105	#include <errno.h>
7	#include <sys/time.h>	106	#include <sys/types.h>
8	#include <time.h>	107	#include <time.h>
9		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
		159	/* darwin simply cannot be helped */
		160	#ifdef __APPLE__
		161	# undef EV_USE_POLL
		162	# undef EV_USE_KQUEUE
		163	#endif
		164
10	#ifdef CLOCK_MONOTONIC	165	#ifndef CLOCK_MONOTONIC
		166	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	167	# define EV_USE_MONOTONIC 0
12	#endif	168	#endif
13		169
14	#define HAVE_EPOLL 1	170	#ifndef CLOCK_REALTIME
		171	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	172	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	173	#endif
17		174
18	#define MAX_BLOCKTIME 60.	175	#if EV_SELECT_IS_WINSOCKET
		176	# include <winsock.h>
		177	#endif
19		178
		179	/**/
		180
		181	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		182	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		183	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		184	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
		185
		186	#ifdef EV_H
		187	# include EV_H
		188	#else
20	#include "ev.h"	189	# include "ev.h"
		190	#endif
21		191
		192	#if __GNUC__ >= 3
		193	# define expect(expr,value) __builtin_expect ((expr),(value))
		194	# define inline static inline
		195	#else
		196	# define expect(expr,value) (expr)
		197	# define inline static
		198	#endif
		199
		200	#define expect_false(expr) expect ((expr) != 0, 0)
		201	#define expect_true(expr) expect ((expr) != 0, 1)
		202
		203	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		204	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		205
		206	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		207	#define EMPTY2(a,b) /* used to suppress some warnings */
		208
22	struct ev_watcher {	209	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	210	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	211	typedef struct ev_watcher_time *WT;
28	};
29		212
		213	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		214
		215	#ifdef _WIN32
		216	# include "ev_win32.c"
		217	#endif
		218
		219	/*****************************************************************************/
		220
		221	static void (*syserr_cb)(const char *msg);
		222
		223	void ev_set_syserr_cb (void (*cb)(const char *msg))
		224	{
		225	syserr_cb = cb;
		226	}
		227
		228	static void
		229	syserr (const char *msg)
		230	{
		231	if (!msg)
		232	msg = "(libev) system error";
		233
		234	if (syserr_cb)
		235	syserr_cb (msg);
		236	else
		237	{
		238	perror (msg);
		239	abort ();
		240	}
		241	}
		242
		243	static void *(*alloc)(void *ptr, long size);
		244
		245	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		246	{
		247	alloc = cb;
		248	}
		249
		250	static void *
		251	ev_realloc (void *ptr, long size)
		252	{
		253	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		254
		255	if (!ptr && size)
		256	{
		257	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		258	abort ();
		259	}
		260
		261	return ptr;
		262	}
		263
		264	#define ev_malloc(size) ev_realloc (0, (size))
		265	#define ev_free(ptr) ev_realloc ((ptr), 0)
		266
		267	/*****************************************************************************/
		268
		269	typedef struct
		270	{
		271	WL head;
		272	unsigned char events;
		273	unsigned char reify;
		274	#if EV_SELECT_IS_WINSOCKET
		275	SOCKET handle;
		276	#endif
		277	} ANFD;
		278
		279	typedef struct
		280	{
		281	W w;
		282	int events;
		283	} ANPENDING;
		284
		285	#if EV_MULTIPLICITY
		286
		287	struct ev_loop
		288	{
		289	ev_tstamp ev_rt_now;
		290	#define ev_rt_now ((loop)->ev_rt_now)
		291	#define VAR(name,decl) decl;
		292	#include "ev_vars.h"
		293	#undef VAR
		294	};
		295	#include "ev_wrap.h"
		296
		297	static struct ev_loop default_loop_struct;
		298	struct ev_loop *ev_default_loop_ptr;
		299
		300	#else
		301
30	ev_tstamp ev_now;	302	ev_tstamp ev_rt_now;
31	int ev_method;	303	#define VAR(name,decl) static decl;
		304	#include "ev_vars.h"
		305	#undef VAR
32		306
33	static int have_monotonic; /* runtime */	307	static int ev_default_loop_ptr;
34		308
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	309	#endif
36	static void (*method_reify)(void);	310
37	static void (*method_poll)(ev_tstamp timeout);	311	/*****************************************************************************/
38		312
39	ev_tstamp	313	ev_tstamp
40	ev_time (void)	314	ev_time (void)
41	{	315	{
42	#if HAVE_REALTIME	316	#if EV_USE_REALTIME
43	struct timespec ts;	317	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	318	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	319	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	320	#else
47	struct timeval tv;	321	struct timeval tv;
48	gettimeofday (&tv, 0);	322	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	323	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	324	#endif
51	}	325	}
52		326
53	static ev_tstamp	327	inline ev_tstamp
54	get_clock (void)	328	get_clock (void)
55	{	329	{
56	#if HAVE_MONOTONIC	330	#if EV_USE_MONOTONIC
57	if (have_monotonic)	331	if (expect_true (have_monotonic))
58	{	332	{
59	struct timespec ts;	333	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	334	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	335	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	336	}
63	#endif	337	#endif
64		338
65	return ev_time ();	339	return ev_time ();
66	}	340	}
67		341
		342	#if EV_MULTIPLICITY
		343	ev_tstamp
		344	ev_now (EV_P)
		345	{
		346	return ev_rt_now;
		347	}
		348	#endif
		349
		350	#define array_roundsize(type,n) (((n) | 4) & ~3)
		351
68	#define array_needsize(base,cur,cnt,init) \	352	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	353	if (expect_false ((cnt) > cur)) \
70	{ \	354	{ \
71	int newcnt = cur ? cur << 1 : 16; \	355	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	356	do \
		357	{ \
		358	newcnt = array_roundsize (type, newcnt << 1); \
		359	} \
		360	while ((cnt) > newcnt); \
		361	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	362	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	363	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	364	cur = newcnt; \
76	}	365	}
77		366
78	typedef struct	367	#define array_slim(type,stem) \
79	{	368	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	369	{ \
81	unsigned char wev, rev; /* want, received event set */	370	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	371	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		372	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		373	}
83		374
84	static ANFD *anfds;	375	#define array_free(stem, idx) \
85	static int anfdmax;	376	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
86		377
87	static int *fdchanges;	378	/*****************************************************************************/
88	static int fdchangemax, fdchangecnt;
89		379
90	static void	380	static void
91	anfds_init (ANFD *base, int count)	381	anfds_init (ANFD *base, int count)
92	{	382	{
93	while (count--)	383	while (count--)
94	{	384	{
95	base->head = 0;	385	base->head = 0;
96	base->wev = base->rev = EV_NONE;	386	base->events = EV_NONE;
		387	base->reify = 0;
		388
97	++base;	389	++base;
98	}	390	}
99	}	391	}
100		392
101	typedef struct	393	void
		394	ev_feed_event (EV_P_ void *w, int revents)
102	{	395	{
103	struct ev_watcher *w;	396	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		397
107	static ANPENDING *pendings;	398	if (expect_false (w_->pending))
108	static int pendingmax, pendingcnt;	399	{
		400	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		401	return;
		402	}
109		403
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	404	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	405	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
115	pendings [pendingcnt - 1].w = w;	406	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	407	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	408	}
118		409
119	static void	410	static void
		411	queue_events (EV_P_ W *events, int eventcnt, int type)
		412	{
		413	int i;
		414
		415	for (i = 0; i < eventcnt; ++i)
		416	ev_feed_event (EV_A_ events [i], type);
		417	}
		418
		419	inline void
120	fd_event (int fd, int events)	420	fd_event (EV_P_ int fd, int revents)
121	{	421	{
122	ANFD *anfd = anfds + fd;	422	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	423	struct ev_io *w;
124		424
125	for (w = anfd->head; w; w = w->next)	425	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	426	{
127	int ev = w->events & events;	427	int ev = w->events & revents;
128		428
129	if (ev)	429	if (ev)
130	event ((struct ev_watcher *)w, ev);	430	ev_feed_event (EV_A_ (W)w, ev);
		431	}
		432	}
		433
		434	void
		435	ev_feed_fd_event (EV_P_ int fd, int revents)
		436	{
		437	fd_event (EV_A_ fd, revents);
		438	}
		439
		440	/*****************************************************************************/
		441
		442	inline void
		443	fd_reify (EV_P)
		444	{
		445	int i;
		446
		447	for (i = 0; i < fdchangecnt; ++i)
		448	{
		449	int fd = fdchanges [i];
		450	ANFD *anfd = anfds + fd;
		451	struct ev_io *w;
		452
		453	int events = 0;
		454
		455	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		456	events |= w->events;
		457
		458	#if EV_SELECT_IS_WINSOCKET
		459	if (events)
		460	{
		461	unsigned long argp;
		462	anfd->handle = _get_osfhandle (fd);
		463	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		464	}
		465	#endif
		466
		467	anfd->reify = 0;
		468
		469	method_modify (EV_A_ fd, anfd->events, events);
		470	anfd->events = events;
		471	}
		472
		473	fdchangecnt = 0;
		474	}
		475
		476	static void
		477	fd_change (EV_P_ int fd)
		478	{
		479	if (expect_false (anfds [fd].reify))
		480	return;
		481
		482	anfds [fd].reify = 1;
		483
		484	++fdchangecnt;
		485	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		486	fdchanges [fdchangecnt - 1] = fd;
		487	}
		488
		489	static void
		490	fd_kill (EV_P_ int fd)
		491	{
		492	struct ev_io *w;
		493
		494	while ((w = (struct ev_io *)anfds [fd].head))
		495	{
		496	ev_io_stop (EV_A_ w);
		497	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		498	}
		499	}
		500
		501	inline int
		502	fd_valid (int fd)
		503	{
		504	#ifdef _WIN32
		505	return _get_osfhandle (fd) != -1;
		506	#else
		507	return fcntl (fd, F_GETFD) != -1;
		508	#endif
		509	}
		510
		511	/* called on EBADF to verify fds */
		512	static void
		513	fd_ebadf (EV_P)
		514	{
		515	int fd;
		516
		517	for (fd = 0; fd < anfdmax; ++fd)
		518	if (anfds [fd].events)
		519	if (!fd_valid (fd) == -1 && errno == EBADF)
		520	fd_kill (EV_A_ fd);
		521	}
		522
		523	/* called on ENOMEM in select/poll to kill some fds and retry */
		524	static void
		525	fd_enomem (EV_P)
		526	{
		527	int fd;
		528
		529	for (fd = anfdmax; fd--; )
		530	if (anfds [fd].events)
		531	{
		532	fd_kill (EV_A_ fd);
		533	return;
131	}	534	}
132	}	535	}
133		536
134	static struct ev_timer **timers;	537	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	538	static void
138	upheap (int k)	539	fd_rearm_all (EV_P)
139	{	540	{
140	struct ev_timer *w = timers [k];	541	int fd;
141		542
		543	/* this should be highly optimised to not do anything but set a flag */
		544	for (fd = 0; fd < anfdmax; ++fd)
		545	if (anfds [fd].events)
		546	{
		547	anfds [fd].events = 0;
		548	fd_change (EV_A_ fd);
		549	}
		550	}
		551
		552	/*****************************************************************************/
		553
		554	static void
		555	upheap (WT *heap, int k)
		556	{
		557	WT w = heap [k];
		558
142	while (k && timers [k >> 1]->at > w->at)	559	while (k && heap [k >> 1]->at > w->at)
143	{	560	{
144	timers [k] = timers [k >> 1];	561	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	562	((W)heap [k])->active = k + 1;
146	k >>= 1;	563	k >>= 1;
147	}	564	}
148		565
149	timers [k] = w;	566	heap [k] = w;
150	timers [k]->active = k + 1;	567	((W)heap [k])->active = k + 1;
151		568
152	}	569	}
153		570
154	static void	571	static void
155	downheap (int k)	572	downheap (WT *heap, int N, int k)
156	{	573	{
157	struct ev_timer *w = timers [k];	574	WT w = heap [k];
158		575
159	while (k < (timercnt >> 1))	576	while (k < (N >> 1))
160	{	577	{
161	int j = k << 1;	578	int j = k << 1;
162		579
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	580	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	581	++j;
165		582
166	if (w->at <= timers [j]->at)	583	if (w->at <= heap [j]->at)
167	break;	584	break;
168		585
169	timers [k] = timers [j];	586	heap [k] = heap [j];
170	timers [k]->active = k + 1;	587	((W)heap [k])->active = k + 1;
171	k = j;	588	k = j;
172	}	589	}
173		590
174	timers [k] = w;	591	heap [k] = w;
175	timers [k]->active = k + 1;	592	((W)heap [k])->active = k + 1;
176	}	593	}
177		594
178	static struct ev_signal **signals;	595	inline void
		596	adjustheap (WT *heap, int N, int k)
		597	{
		598	upheap (heap, k);
		599	downheap (heap, N, k);
		600	}
		601
		602	/*****************************************************************************/
		603
		604	typedef struct
		605	{
		606	WL head;
		607	sig_atomic_t volatile gotsig;
		608	} ANSIG;
		609
		610	static ANSIG *signals;
179	static int signalmax, signalcnt;	611	static int signalmax;
180		612
		613	static int sigpipe [2];
		614	static sig_atomic_t volatile gotsig;
		615	static struct ev_io sigev;
		616
181	static void	617	static void
182	signals_init (struct ev_signal **base, int count)	618	signals_init (ANSIG *base, int count)
183	{	619	{
184	while (count--)	620	while (count--)
185	*base++ = 0;	621	{
186	}	622	base->head = 0;
		623	base->gotsig = 0;
187		624
		625	++base;
		626	}
		627	}
		628
		629	static void
		630	sighandler (int signum)
		631	{
		632	#if _WIN32
		633	signal (signum, sighandler);
		634	#endif
		635
		636	signals [signum - 1].gotsig = 1;
		637
		638	if (!gotsig)
		639	{
		640	int old_errno = errno;
		641	gotsig = 1;
		642	write (sigpipe [1], &signum, 1);
		643	errno = old_errno;
		644	}
		645	}
		646
		647	void
		648	ev_feed_signal_event (EV_P_ int signum)
		649	{
		650	WL w;
		651
		652	#if EV_MULTIPLICITY
		653	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		654	#endif
		655
		656	--signum;
		657
		658	if (signum < 0 || signum >= signalmax)
		659	return;
		660
		661	signals [signum].gotsig = 0;
		662
		663	for (w = signals [signum].head; w; w = w->next)
		664	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		665	}
		666
		667	static void
		668	sigcb (EV_P_ struct ev_io *iow, int revents)
		669	{
		670	int signum;
		671
		672	read (sigpipe [0], &revents, 1);
		673	gotsig = 0;
		674
		675	for (signum = signalmax; signum--; )
		676	if (signals [signum].gotsig)
		677	ev_feed_signal_event (EV_A_ signum + 1);
		678	}
		679
		680	static void
		681	fd_intern (int fd)
		682	{
		683	#ifdef _WIN32
		684	int arg = 1;
		685	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		686	#else
		687	fcntl (fd, F_SETFD, FD_CLOEXEC);
		688	fcntl (fd, F_SETFL, O_NONBLOCK);
		689	#endif
		690	}
		691
		692	static void
		693	siginit (EV_P)
		694	{
		695	fd_intern (sigpipe [0]);
		696	fd_intern (sigpipe [1]);
		697
		698	ev_io_set (&sigev, sigpipe [0], EV_READ);
		699	ev_io_start (EV_A_ &sigev);
		700	ev_unref (EV_A); /* child watcher should not keep loop alive */
		701	}
		702
		703	/*****************************************************************************/
		704
		705	static struct ev_child *childs [PID_HASHSIZE];
		706
		707	#ifndef _WIN32
		708
		709	static struct ev_signal childev;
		710
		711	#ifndef WCONTINUED
		712	# define WCONTINUED 0
		713	#endif
		714
		715	static void
		716	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		717	{
		718	struct ev_child *w;
		719
		720	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		721	if (w->pid == pid || !w->pid)
		722	{
		723	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		724	w->rpid = pid;
		725	w->rstatus = status;
		726	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		727	}
		728	}
		729
		730	static void
		731	childcb (EV_P_ struct ev_signal *sw, int revents)
		732	{
		733	int pid, status;
		734
		735	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		736	{
		737	/* make sure we are called again until all childs have been reaped */
		738	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		739
		740	child_reap (EV_A_ sw, pid, pid, status);
		741	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		742	}
		743	}
		744
		745	#endif
		746
		747	/*****************************************************************************/
		748
		749	#if EV_USE_PORT
		750	# include "ev_port.c"
		751	#endif
		752	#if EV_USE_KQUEUE
		753	# include "ev_kqueue.c"
		754	#endif
188	#if HAVE_EPOLL	755	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	756	# include "ev_epoll.c"
190	#endif	757	#endif
		758	#if EV_USE_POLL
		759	# include "ev_poll.c"
		760	#endif
191	#if HAVE_SELECT	761	#if EV_USE_SELECT
192	# include "ev_select.c"	762	# include "ev_select.c"
193	#endif	763	#endif
194		764
195	int ev_init (int flags)	765	int
		766	ev_version_major (void)
196	{	767	{
		768	return EV_VERSION_MAJOR;
		769	}
		770
		771	int
		772	ev_version_minor (void)
		773	{
		774	return EV_VERSION_MINOR;
		775	}
		776
		777	/* return true if we are running with elevated privileges and should ignore env variables */
		778	static int
		779	enable_secure (void)
		780	{
		781	#ifdef _WIN32
		782	return 0;
		783	#else
		784	return getuid () != geteuid ()
		785	|| getgid () != getegid ();
		786	#endif
		787	}
		788
		789	unsigned int
		790	ev_method (EV_P)
		791	{
		792	return method;
		793	}
		794
		795	static void
		796	loop_init (EV_P_ unsigned int flags)
		797	{
		798	if (!method)
		799	{
197	#if HAVE_MONOTONIC	800	#if EV_USE_MONOTONIC
198	{	801	{
199	struct timespec ts;	802	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	803	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	804	have_monotonic = 1;
202	}	805	}
203	#endif	806	#endif
204		807
205	ev_now = ev_time ();	808	ev_rt_now = ev_time ();
		809	mn_now = get_clock ();
		810	now_floor = mn_now;
		811	rtmn_diff = ev_rt_now - mn_now;
206		812
		813	if (!(flags & EVFLAG_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		814	flags = atoi (getenv ("LIBEV_FLAGS"));
		815
		816	if (!(flags & 0x0000ffff))
		817	flags |= 0x0000ffff;
		818
		819	method = 0;
		820	#if EV_USE_PORT
		821	if (!method && (flags & EVMETHOD_PORT )) method = port_init (EV_A_ flags);
		822	#endif
		823	#if EV_USE_KQUEUE
		824	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		825	#endif
207	#if HAVE_EPOLL	826	#if EV_USE_EPOLL
208	if (epoll_init (flags))	827	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
209	return ev_method;
210	#endif	828	#endif
		829	#if EV_USE_POLL
		830	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		831	#endif
211	#if HAVE_SELECT	832	#if EV_USE_SELECT
212	if (select_init (flags))	833	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
213	return ev_method;
214	#endif	834	#endif
215		835
216	ev_method = EVMETHOD_NONE;	836	ev_init (&sigev, sigcb);
217	return ev_method;	837	ev_set_priority (&sigev, EV_MAXPRI);
		838	}
218	}	839	}
219		840
220	void ev_prefork (void)
221	{
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void	841	static void
236	call_pending ()	842	loop_destroy (EV_P)
237	{	843	{
238	int i;	844	int i;
239		845
240	for (i = 0; i < pendingcnt; ++i)	846	#if EV_USE_PORT
		847	if (method == EVMETHOD_PORT ) port_destroy (EV_A);
		848	#endif
		849	#if EV_USE_KQUEUE
		850	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		851	#endif
		852	#if EV_USE_EPOLL
		853	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		854	#endif
		855	#if EV_USE_POLL
		856	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		857	#endif
		858	#if EV_USE_SELECT
		859	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		860	#endif
		861
		862	for (i = NUMPRI; i--; )
		863	array_free (pending, [i]);
		864
		865	/* have to use the microsoft-never-gets-it-right macro */
		866	array_free (fdchange, EMPTY0);
		867	array_free (timer, EMPTY0);
		868	#if EV_PERIODICS
		869	array_free (periodic, EMPTY0);
		870	#endif
		871	array_free (idle, EMPTY0);
		872	array_free (prepare, EMPTY0);
		873	array_free (check, EMPTY0);
		874
		875	method = 0;
		876	}
		877
		878	static void
		879	loop_fork (EV_P)
		880	{
		881	#if EV_USE_PORT
		882	if (method == EVMETHOD_PORT ) port_fork (EV_A);
		883	#endif
		884	#if EV_USE_KQUEUE
		885	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		886	#endif
		887	#if EV_USE_EPOLL
		888	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		889	#endif
		890
		891	if (ev_is_active (&sigev))
		892	{
		893	/* default loop */
		894
		895	ev_ref (EV_A);
		896	ev_io_stop (EV_A_ &sigev);
		897	close (sigpipe [0]);
		898	close (sigpipe [1]);
		899
		900	while (pipe (sigpipe))
		901	syserr ("(libev) error creating pipe");
		902
		903	siginit (EV_A);
241	{	904	}
242	ANPENDING *p = pendings + i;
243		905
244	if (p->w)	906	postfork = 0;
		907	}
		908
		909	#if EV_MULTIPLICITY
		910	struct ev_loop *
		911	ev_loop_new (unsigned int flags)
		912	{
		913	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		914
		915	memset (loop, 0, sizeof (struct ev_loop));
		916
		917	loop_init (EV_A_ flags);
		918
		919	if (ev_method (EV_A))
		920	return loop;
		921
		922	return 0;
		923	}
		924
		925	void
		926	ev_loop_destroy (EV_P)
		927	{
		928	loop_destroy (EV_A);
		929	ev_free (loop);
		930	}
		931
		932	void
		933	ev_loop_fork (EV_P)
		934	{
		935	postfork = 1;
		936	}
		937
		938	#endif
		939
		940	#if EV_MULTIPLICITY
		941	struct ev_loop *
		942	ev_default_loop_init (unsigned int flags)
		943	#else
		944	int
		945	ev_default_loop (unsigned int flags)
		946	#endif
		947	{
		948	if (sigpipe [0] == sigpipe [1])
		949	if (pipe (sigpipe))
		950	return 0;
		951
		952	if (!ev_default_loop_ptr)
		953	{
		954	#if EV_MULTIPLICITY
		955	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		956	#else
		957	ev_default_loop_ptr = 1;
		958	#endif
		959
		960	loop_init (EV_A_ flags);
		961
		962	if (ev_method (EV_A))
245	{	963	{
246	p->w->pending = 0;	964	siginit (EV_A);
247	p->w->cb (p->w, p->events);	965
		966	#ifndef _WIN32
		967	ev_signal_init (&childev, childcb, SIGCHLD);
		968	ev_set_priority (&childev, EV_MAXPRI);
		969	ev_signal_start (EV_A_ &childev);
		970	ev_unref (EV_A); /* child watcher should not keep loop alive */
		971	#endif
248	}	972	}
		973	else
		974	ev_default_loop_ptr = 0;
		975	}
		976
		977	return ev_default_loop_ptr;
		978	}
		979
		980	void
		981	ev_default_destroy (void)
		982	{
		983	#if EV_MULTIPLICITY
		984	struct ev_loop *loop = ev_default_loop_ptr;
		985	#endif
		986
		987	#ifndef _WIN32
		988	ev_ref (EV_A); /* child watcher */
		989	ev_signal_stop (EV_A_ &childev);
		990	#endif
		991
		992	ev_ref (EV_A); /* signal watcher */
		993	ev_io_stop (EV_A_ &sigev);
		994
		995	close (sigpipe [0]); sigpipe [0] = 0;
		996	close (sigpipe [1]); sigpipe [1] = 0;
		997
		998	loop_destroy (EV_A);
		999	}
		1000
		1001	void
		1002	ev_default_fork (void)
		1003	{
		1004	#if EV_MULTIPLICITY
		1005	struct ev_loop *loop = ev_default_loop_ptr;
		1006	#endif
		1007
		1008	if (method)
		1009	postfork = 1;
		1010	}
		1011
		1012	/*****************************************************************************/
		1013
		1014	static int
		1015	any_pending (EV_P)
		1016	{
		1017	int pri;
		1018
		1019	for (pri = NUMPRI; pri--; )
		1020	if (pendingcnt [pri])
		1021	return 1;
		1022
		1023	return 0;
		1024	}
		1025
		1026	inline void
		1027	call_pending (EV_P)
		1028	{
		1029	int pri;
		1030
		1031	for (pri = NUMPRI; pri--; )
		1032	while (pendingcnt [pri])
		1033	{
		1034	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1035
		1036	if (expect_true (p->w))
		1037	{
		1038	p->w->pending = 0;
		1039	EV_CB_INVOKE (p->w, p->events);
		1040	}
249	}	1041	}
250
251	pendingcnt = 0;
252	}	1042	}
253		1043
254	static void	1044	inline void
255	timer_reify (void)	1045	timers_reify (EV_P)
256	{	1046	{
257	while (timercnt && timers [0]->at <= ev_now)	1047	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	1048	{
259	struct ev_timer *w = timers [0];	1049	struct ev_timer *w = timers [0];
260		1050
		1051	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		1052
261	/* first reschedule timer */	1053	/* first reschedule or stop timer */
262	if (w->repeat)	1054	if (w->repeat)
263	{	1055	{
264	if (w->is_abs)	1056	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1057
266	else
267	w->at = ev_now + w->repeat;	1058	((WT)w)->at += w->repeat;
		1059	if (((WT)w)->at < mn_now)
		1060	((WT)w)->at = mn_now;
268		1061
269	downheap (0);	1062	downheap ((WT *)timers, timercnt, 0);
270	}	1063	}
271	else	1064	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1065	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1066
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1067	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1068	}
		1069	}
		1070
		1071	#if EV_PERIODICS
		1072	inline void
		1073	periodics_reify (EV_P)
		1074	{
		1075	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	1076	{
276	}	1077	struct ev_periodic *w = periodics [0];
277		1078
278	int ev_loop_done;	1079	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		1080
		1081	/* first reschedule or stop timer */
		1082	if (w->reschedule_cb)
		1083	{
		1084	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1085	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1086	downheap ((WT *)periodics, periodiccnt, 0);
		1087	}
		1088	else if (w->interval)
		1089	{
		1090	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1091	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1092	downheap ((WT *)periodics, periodiccnt, 0);
		1093	}
		1094	else
		1095	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1096
		1097	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1098	}
		1099	}
		1100
		1101	static void
		1102	periodics_reschedule (EV_P)
		1103	{
		1104	int i;
		1105
		1106	/* adjust periodics after time jump */
		1107	for (i = 0; i < periodiccnt; ++i)
		1108	{
		1109	struct ev_periodic *w = periodics [i];
		1110
		1111	if (w->reschedule_cb)
		1112	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1113	else if (w->interval)
		1114	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1115	}
		1116
		1117	/* now rebuild the heap */
		1118	for (i = periodiccnt >> 1; i--; )
		1119	downheap ((WT *)periodics, periodiccnt, i);
		1120	}
		1121	#endif
		1122
		1123	inline int
		1124	time_update_monotonic (EV_P)
		1125	{
		1126	mn_now = get_clock ();
		1127
		1128	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1129	{
		1130	ev_rt_now = rtmn_diff + mn_now;
		1131	return 0;
		1132	}
		1133	else
		1134	{
		1135	now_floor = mn_now;
		1136	ev_rt_now = ev_time ();
		1137	return 1;
		1138	}
		1139	}
		1140
		1141	inline void
		1142	time_update (EV_P)
		1143	{
		1144	int i;
		1145
		1146	#if EV_USE_MONOTONIC
		1147	if (expect_true (have_monotonic))
		1148	{
		1149	if (time_update_monotonic (EV_A))
		1150	{
		1151	ev_tstamp odiff = rtmn_diff;
		1152
		1153	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1154	{
		1155	rtmn_diff = ev_rt_now - mn_now;
		1156
		1157	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1158	return; /* all is well */
		1159
		1160	ev_rt_now = ev_time ();
		1161	mn_now = get_clock ();
		1162	now_floor = mn_now;
		1163	}
		1164
		1165	# if EV_PERIODICS
		1166	periodics_reschedule (EV_A);
		1167	# endif
		1168	/* no timer adjustment, as the monotonic clock doesn't jump */
		1169	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1170	}
		1171	}
		1172	else
		1173	#endif
		1174	{
		1175	ev_rt_now = ev_time ();
		1176
		1177	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1178	{
		1179	#if EV_PERIODICS
		1180	periodics_reschedule (EV_A);
		1181	#endif
		1182
		1183	/* adjust timers. this is easy, as the offset is the same for all */
		1184	for (i = 0; i < timercnt; ++i)
		1185	((WT)timers [i])->at += ev_rt_now - mn_now;
		1186	}
		1187
		1188	mn_now = ev_rt_now;
		1189	}
		1190	}
		1191
		1192	void
		1193	ev_ref (EV_P)
		1194	{
		1195	++activecnt;
		1196	}
		1197
		1198	void
		1199	ev_unref (EV_P)
		1200	{
		1201	--activecnt;
		1202	}
		1203
		1204	static int loop_done;
		1205
		1206	void
280	int ev_loop (int flags)	1207	ev_loop (EV_P_ int flags)
281	{	1208	{
282	double block;	1209	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1210	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1211
285	do	1212	while (activecnt)
286	{	1213	{
		1214	/* queue check watchers (and execute them) */
		1215	if (expect_false (preparecnt))
		1216	{
		1217	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1218	call_pending (EV_A);
		1219	}
		1220
		1221	/* we might have forked, so reify kernel state if necessary */
		1222	if (expect_false (postfork))
		1223	loop_fork (EV_A);
		1224
287	/* update fd-related kernel structures */	1225	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1226	fd_reify (EV_A);
289		1227
290	/* calculate blocking time */	1228	/* calculate blocking time */
		1229
		1230	/* we only need this for !monotonic clock or timers, but as we basically
		1231	always have timers, we just calculate it always */
		1232	#if EV_USE_MONOTONIC
		1233	if (expect_true (have_monotonic))
		1234	time_update_monotonic (EV_A);
		1235	else
		1236	#endif
		1237	{
291	ev_now = ev_time ();	1238	ev_rt_now = ev_time ();
		1239	mn_now = ev_rt_now;
		1240	}
292		1241
293	if (flags & EVLOOP_NONBLOCK)	1242	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1243	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1244	else
298	{	1245	{
		1246	block = MAX_BLOCKTIME;
		1247
		1248	if (timercnt)
		1249	{
299	block = timers [0]->at - ev_now + method_fudge;	1250	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1251	if (block > to) block = to;
		1252	}
		1253
		1254	#if EV_PERIODICS
		1255	if (periodiccnt)
		1256	{
		1257	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
		1258	if (block > to) block = to;
		1259	}
		1260	#endif
		1261
300	if (block < 0.) block = 0.;	1262	if (expect_false (block < 0.)) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1263	}
303		1264
304	method_poll (block);	1265	method_poll (EV_A_ block);
305		1266
		1267	/* update ev_rt_now, do magic */
		1268	time_update (EV_A);
		1269
306	/* put pending timers into pendign queue and reschedule them */	1270	/* queue pending timers and reschedule them */
307	timer_reify ();	1271	timers_reify (EV_A); /* relative timers called last */
		1272	#if EV_PERIODICS
		1273	periodics_reify (EV_A); /* absolute timers called first */
		1274	#endif
308		1275
309	ev_now = ev_time ();	1276	/* queue idle watchers unless io or timers are pending */
		1277	if (idlecnt && !any_pending (EV_A))
		1278	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1279
		1280	/* queue check watchers, to be executed first */
		1281	if (expect_false (checkcnt))
		1282	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1283
310	call_pending ();	1284	call_pending (EV_A);
311	}
312	while (!ev_loop_done);
313	}
314		1285
315	static void	1286	if (expect_false (loop_done))
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1287	break;
		1288	}
		1289
		1290	if (loop_done != 2)
		1291	loop_done = 0;
		1292	}
		1293
		1294	void
		1295	ev_unloop (EV_P_ int how)
		1296	{
		1297	loop_done = how;
		1298	}
		1299
		1300	/*****************************************************************************/
		1301
		1302	inline void
		1303	wlist_add (WL *head, WL elem)
317	{	1304	{
318	elem->next = *head;	1305	elem->next = *head;
319	*head = elem;	1306	*head = elem;
320	}	1307	}
321		1308
322	static void	1309	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1310	wlist_del (WL *head, WL elem)
324	{	1311	{
325	while (*head)	1312	while (*head)
326	{	1313	{
327	if (*head == elem)	1314	if (*head == elem)
328	{	1315	{
…		…
332		1319
333	head = &(*head)->next;	1320	head = &(*head)->next;
334	}	1321	}
335	}	1322	}
336		1323
337	static void	1324	inline void
338	ev_start (struct ev_watcher *w, int active)	1325	ev_clear_pending (EV_P_ W w)
339	{	1326	{
		1327	if (w->pending)
		1328	{
		1329	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1330	w->pending = 0;
		1331	}
		1332	}
		1333
		1334	inline void
		1335	ev_start (EV_P_ W w, int active)
		1336	{
		1337	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1338	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1339
341	w->active = active;	1340	w->active = active;
		1341	ev_ref (EV_A);
342	}	1342	}
343		1343
344	static void	1344	inline void
345	ev_stop (struct ev_watcher *w)	1345	ev_stop (EV_P_ W w)
346	{	1346	{
347	if (w->pending)	1347	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1348	w->active = 0;
351	/* nop */
352	}	1349	}
353		1350
		1351	/*****************************************************************************/
		1352
354	void	1353	void
355	evio_start (struct ev_io *w)	1354	ev_io_start (EV_P_ struct ev_io *w)
		1355	{
		1356	int fd = w->fd;
		1357
		1358	if (expect_false (ev_is_active (w)))
		1359	return;
		1360
		1361	assert (("ev_io_start called with negative fd", fd >= 0));
		1362
		1363	ev_start (EV_A_ (W)w, 1);
		1364	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1365	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1366
		1367	fd_change (EV_A_ fd);
		1368	}
		1369
		1370	void
		1371	ev_io_stop (EV_P_ struct ev_io *w)
		1372	{
		1373	ev_clear_pending (EV_A_ (W)w);
		1374	if (expect_false (!ev_is_active (w)))
		1375	return;
		1376
		1377	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1378
		1379	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1380	ev_stop (EV_A_ (W)w);
		1381
		1382	fd_change (EV_A_ w->fd);
		1383	}
		1384
		1385	void
		1386	ev_timer_start (EV_P_ struct ev_timer *w)
		1387	{
		1388	if (expect_false (ev_is_active (w)))
		1389	return;
		1390
		1391	((WT)w)->at += mn_now;
		1392
		1393	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1394
		1395	ev_start (EV_A_ (W)w, ++timercnt);
		1396	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1397	timers [timercnt - 1] = w;
		1398	upheap ((WT *)timers, timercnt - 1);
		1399
		1400	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1401	}
		1402
		1403	void
		1404	ev_timer_stop (EV_P_ struct ev_timer *w)
		1405	{
		1406	ev_clear_pending (EV_A_ (W)w);
		1407	if (expect_false (!ev_is_active (w)))
		1408	return;
		1409
		1410	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1411
		1412	if (expect_true (((W)w)->active < timercnt--))
		1413	{
		1414	timers [((W)w)->active - 1] = timers [timercnt];
		1415	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1416	}
		1417
		1418	((WT)w)->at -= mn_now;
		1419
		1420	ev_stop (EV_A_ (W)w);
		1421	}
		1422
		1423	void
		1424	ev_timer_again (EV_P_ struct ev_timer *w)
356	{	1425	{
357	if (ev_is_active (w))	1426	if (ev_is_active (w))
358	return;
359
360	int fd = w->fd;
361
362	ev_start ((struct ev_watcher *)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
365
366	++fdchangecnt;
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}
370
371	void
372	evio_stop (struct ev_io *w)
373	{
374	if (!ev_is_active (w))
375	return;
376
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
378	ev_stop ((struct ev_watcher *)w);
379
380	++fdchangecnt;
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}
384
385	void
386	evtimer_start (struct ev_timer *w)
387	{
388	if (ev_is_active (w))
389	return;
390
391	if (w->is_abs)
392	{	1427	{
393	/* this formula differs from the one in timer_reify becuse we do not round up */
394	if (w->repeat)	1428	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1429	{
		1430	((WT)w)->at = mn_now + w->repeat;
		1431	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1432	}
		1433	else
		1434	ev_timer_stop (EV_A_ w);
		1435	}
		1436	else if (w->repeat)
396	}	1437	{
397	else	1438	w->at = w->repeat;
398	w->at += ev_now;	1439	ev_timer_start (EV_A_ w);
		1440	}
		1441	}
399		1442
400	ev_start ((struct ev_watcher *)w, ++timercnt);	1443	#if EV_PERIODICS
401	array_needsize (timers, timermax, timercnt, );	1444	void
		1445	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1446	{
		1447	if (expect_false (ev_is_active (w)))
		1448	return;
		1449
		1450	if (w->reschedule_cb)
		1451	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1452	else if (w->interval)
		1453	{
		1454	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1455	/* this formula differs from the one in periodic_reify because we do not always round up */
		1456	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1457	}
		1458
		1459	ev_start (EV_A_ (W)w, ++periodiccnt);
		1460	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1461	periodics [periodiccnt - 1] = w;
		1462	upheap ((WT *)periodics, periodiccnt - 1);
		1463
		1464	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1465	}
		1466
		1467	void
		1468	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1469	{
		1470	ev_clear_pending (EV_A_ (W)w);
		1471	if (expect_false (!ev_is_active (w)))
		1472	return;
		1473
		1474	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1475
		1476	if (expect_true (((W)w)->active < periodiccnt--))
		1477	{
		1478	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1479	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1480	}
		1481
		1482	ev_stop (EV_A_ (W)w);
		1483	}
		1484
		1485	void
		1486	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1487	{
		1488	/* TODO: use adjustheap and recalculation */
		1489	ev_periodic_stop (EV_A_ w);
		1490	ev_periodic_start (EV_A_ w);
		1491	}
		1492	#endif
		1493
		1494	void
		1495	ev_idle_start (EV_P_ struct ev_idle *w)
		1496	{
		1497	if (expect_false (ev_is_active (w)))
		1498	return;
		1499
		1500	ev_start (EV_A_ (W)w, ++idlecnt);
		1501	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
402	timers [timercnt - 1] = w;	1502	idles [idlecnt - 1] = w;
403	upheap (timercnt - 1);
404	}	1503	}
405		1504
406	void	1505	void
407	evtimer_stop (struct ev_timer *w)	1506	ev_idle_stop (EV_P_ struct ev_idle *w)
408	{	1507	{
		1508	ev_clear_pending (EV_A_ (W)w);
409	if (!ev_is_active (w))	1509	if (expect_false (!ev_is_active (w)))
410	return;	1510	return;
411		1511
412	if (w->active < timercnt--)	1512	idles [((W)w)->active - 1] = idles [--idlecnt];
413	{	1513	ev_stop (EV_A_ (W)w);
414	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);
416	}
417
418	ev_stop ((struct ev_watcher *)w);
419	}	1514	}
420		1515
421	void	1516	void
		1517	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1518	{
		1519	if (expect_false (ev_is_active (w)))
		1520	return;
		1521
		1522	ev_start (EV_A_ (W)w, ++preparecnt);
		1523	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1524	prepares [preparecnt - 1] = w;
		1525	}
		1526
		1527	void
		1528	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1529	{
		1530	ev_clear_pending (EV_A_ (W)w);
		1531	if (expect_false (!ev_is_active (w)))
		1532	return;
		1533
		1534	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1535	ev_stop (EV_A_ (W)w);
		1536	}
		1537
		1538	void
		1539	ev_check_start (EV_P_ struct ev_check *w)
		1540	{
		1541	if (expect_false (ev_is_active (w)))
		1542	return;
		1543
		1544	ev_start (EV_A_ (W)w, ++checkcnt);
		1545	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1546	checks [checkcnt - 1] = w;
		1547	}
		1548
		1549	void
		1550	ev_check_stop (EV_P_ struct ev_check *w)
		1551	{
		1552	ev_clear_pending (EV_A_ (W)w);
		1553	if (expect_false (!ev_is_active (w)))
		1554	return;
		1555
		1556	checks [((W)w)->active - 1] = checks [--checkcnt];
		1557	ev_stop (EV_A_ (W)w);
		1558	}
		1559
		1560	#ifndef SA_RESTART
		1561	# define SA_RESTART 0
		1562	#endif
		1563
		1564	void
422	evsignal_start (struct ev_signal *w)	1565	ev_signal_start (EV_P_ struct ev_signal *w)
423	{	1566	{
		1567	#if EV_MULTIPLICITY
		1568	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1569	#endif
424	if (ev_is_active (w))	1570	if (expect_false (ev_is_active (w)))
425	return;	1571	return;
426		1572
427	ev_start ((struct ev_watcher *)w, 1);	1573	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1574
		1575	ev_start (EV_A_ (W)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);	1576	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1577	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
430	}
431		1578
		1579	if (!((WL)w)->next)
		1580	{
		1581	#if _WIN32
		1582	signal (w->signum, sighandler);
		1583	#else
		1584	struct sigaction sa;
		1585	sa.sa_handler = sighandler;
		1586	sigfillset (&sa.sa_mask);
		1587	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1588	sigaction (w->signum, &sa, 0);
		1589	#endif
		1590	}
		1591	}
		1592
432	void	1593	void
433	evsignal_stop (struct ev_signal *w)	1594	ev_signal_stop (EV_P_ struct ev_signal *w)
434	{	1595	{
		1596	ev_clear_pending (EV_A_ (W)w);
435	if (!ev_is_active (w))	1597	if (expect_false (!ev_is_active (w)))
436	return;	1598	return;
437		1599
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1600	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
439	ev_stop ((struct ev_watcher *)w);	1601	ev_stop (EV_A_ (W)w);
		1602
		1603	if (!signals [w->signum - 1].head)
		1604	signal (w->signum, SIG_DFL);
		1605	}
		1606
		1607	void
		1608	ev_child_start (EV_P_ struct ev_child *w)
		1609	{
		1610	#if EV_MULTIPLICITY
		1611	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1612	#endif
		1613	if (expect_false (ev_is_active (w)))
		1614	return;
		1615
		1616	ev_start (EV_A_ (W)w, 1);
		1617	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1618	}
		1619
		1620	void
		1621	ev_child_stop (EV_P_ struct ev_child *w)
		1622	{
		1623	ev_clear_pending (EV_A_ (W)w);
		1624	if (expect_false (!ev_is_active (w)))
		1625	return;
		1626
		1627	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1628	ev_stop (EV_A_ (W)w);
440	}	1629	}
441		1630
442	/*****************************************************************************/	1631	/*****************************************************************************/
443	#if 1
444		1632
445	static void	1633	struct ev_once
446	sin_cb (struct ev_io *w, int revents)
447	{	1634	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}
450
451	static void
452	ocb (struct ev_timer *w, int revents)
453	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
455	}
456
457	int main (void)
458	{
459	struct ev_io sin;	1635	struct ev_io io;
460
461	ev_init (0);
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];	1636	struct ev_timer to;
		1637	void (*cb)(int revents, void *arg);
		1638	void *arg;
		1639	};
468		1640
469	int i;	1641	static void
470	for (i = 0; i < 1000; ++i)	1642	once_cb (EV_P_ struct ev_once *once, int revents)
471	{	1643	{
472	struct ev_timer *w = t + i;	1644	void (*cb)(int revents, void *arg) = once->cb;
473	evw_init (w, ocb, i);	1645	void *arg = once->arg;
474	evtimer_set_rel (w, drand48 (), 0);	1646
475	evtimer_start (w);	1647	ev_io_stop (EV_A_ &once->io);
476	if (drand48 () < 0.5)	1648	ev_timer_stop (EV_A_ &once->to);
477	evtimer_stop (w);	1649	ev_free (once);
		1650
		1651	cb (revents, arg);
		1652	}
		1653
		1654	static void
		1655	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1656	{
		1657	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1658	}
		1659
		1660	static void
		1661	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1662	{
		1663	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1664	}
		1665
		1666	void
		1667	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1668	{
		1669	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1670
		1671	if (expect_false (!once))
478	}	1672	{
479		1673	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
480	ev_loop (0);
481
482	return 0;	1674	return;
483	}	1675	}
484		1676
485	#endif	1677	once->cb = cb;
		1678	once->arg = arg;
486		1679
		1680	ev_init (&once->io, once_cb_io);
		1681	if (fd >= 0)
		1682	{
		1683	ev_io_set (&once->io, fd, events);
		1684	ev_io_start (EV_A_ &once->io);
		1685	}
487		1686
		1687	ev_init (&once->to, once_cb_to);
		1688	if (timeout >= 0.)
		1689	{
		1690	ev_timer_set (&once->to, timeout, 0.);
		1691	ev_timer_start (EV_A_ &once->to);
		1692	}
		1693	}
488		1694
		1695	#ifdef __cplusplus
		1696	}
		1697	#endif
489		1698

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