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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 1.97 by root, Sun Nov 11 01:53:07 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	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
		68	#include <fcntl.h>
		69	#include <stddef.h>
3		70
4	#include <stdio.h>	71	#include <stdio.h>
5		72
6	#include <assert.h>	73	#include <assert.h>
7	#include <errno.h>	74	#include <errno.h>
8	#include <sys/time.h>	75	#include <sys/types.h>
9	#include <time.h>	76	#include <time.h>
10		77
		78	#include <signal.h>
		79
		80	#ifndef WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#endif
		85	/**/
		86
		87	#ifndef EV_USE_MONOTONIC
		88	# define EV_USE_MONOTONIC 1
		89	#endif
		90
		91	#ifndef EV_USE_SELECT
		92	# define EV_USE_SELECT 1
		93	#endif
		94
		95	#ifndef EV_USE_POLL
		96	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		97	#endif
		98
		99	#ifndef EV_USE_EPOLL
		100	# define EV_USE_EPOLL 0
		101	#endif
		102
		103	#ifndef EV_USE_KQUEUE
		104	# define EV_USE_KQUEUE 0
		105	#endif
		106
		107	#ifndef EV_USE_WIN32
		108	# ifdef WIN32
		109	# define EV_USE_WIN32 0 /* it does not exist, use select */
		110	# undef EV_USE_SELECT
		111	# define EV_USE_SELECT 1
		112	# else
		113	# define EV_USE_WIN32 0
		114	# endif
		115	#endif
		116
		117	#ifndef EV_USE_REALTIME
		118	# define EV_USE_REALTIME 1
		119	#endif
		120
		121	/**/
		122
11	#ifdef CLOCK_MONOTONIC	123	#ifndef CLOCK_MONOTONIC
		124	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	125	# define EV_USE_MONOTONIC 0
13	#endif	126	#endif
14		127
15	#define HAVE_EPOLL 1	128	#ifndef CLOCK_REALTIME
		129	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	130	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	131	#endif
		132
		133	/**/
18		134
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	135	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	136	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		137	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		138	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		139
		140	#ifdef EV_H
		141	# include EV_H
		142	#else
22	#include "ev.h"	143	# include "ev.h"
		144	#endif
23		145
		146	#if __GNUC__ >= 3
		147	# define expect(expr,value) __builtin_expect ((expr),(value))
		148	# define inline inline
		149	#else
		150	# define expect(expr,value) (expr)
		151	# define inline static
		152	#endif
		153
		154	#define expect_false(expr) expect ((expr) != 0, 0)
		155	#define expect_true(expr) expect ((expr) != 0, 1)
		156
		157	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		158	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		159
24	struct ev_watcher {	160	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	161	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	162	typedef struct ev_watcher_time *WT;
30	};
31		163
32	static ev_tstamp now, diff; /* monotonic clock */	164	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		165
		166	#include "ev_win32.c"
		167
		168	/*****************************************************************************/
		169
		170	static void (*syserr_cb)(const char *msg);
		171
		172	void ev_set_syserr_cb (void (*cb)(const char *msg))
		173	{
		174	syserr_cb = cb;
		175	}
		176
		177	static void
		178	syserr (const char *msg)
		179	{
		180	if (!msg)
		181	msg = "(libev) system error";
		182
		183	if (syserr_cb)
		184	syserr_cb (msg);
		185	else
		186	{
		187	perror (msg);
		188	abort ();
		189	}
		190	}
		191
		192	static void *(*alloc)(void *ptr, long size);
		193
		194	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		195	{
		196	alloc = cb;
		197	}
		198
		199	static void *
		200	ev_realloc (void *ptr, long size)
		201	{
		202	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		203
		204	if (!ptr && size)
		205	{
		206	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		207	abort ();
		208	}
		209
		210	return ptr;
		211	}
		212
		213	#define ev_malloc(size) ev_realloc (0, (size))
		214	#define ev_free(ptr) ev_realloc ((ptr), 0)
		215
		216	/*****************************************************************************/
		217
		218	typedef struct
		219	{
		220	WL head;
		221	unsigned char events;
		222	unsigned char reify;
		223	} ANFD;
		224
		225	typedef struct
		226	{
		227	W w;
		228	int events;
		229	} ANPENDING;
		230
		231	#if EV_MULTIPLICITY
		232
		233	struct ev_loop
		234	{
		235	ev_tstamp ev_rt_now;
		236	#define VAR(name,decl) decl;
		237	#include "ev_vars.h"
		238	#undef VAR
		239	};
		240	#include "ev_wrap.h"
		241
		242	struct ev_loop default_loop_struct;
		243	static struct ev_loop *default_loop;
		244
		245	#else
		246
33	ev_tstamp ev_now;	247	ev_tstamp ev_rt_now;
34	int ev_method;	248	#define VAR(name,decl) static decl;
		249	#include "ev_vars.h"
		250	#undef VAR
35		251
36	static int have_monotonic; /* runtime */	252	static int default_loop;
37		253
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	254	#endif
39	static void (*method_reify)(void);	255
40	static void (*method_poll)(ev_tstamp timeout);	256	/*****************************************************************************/
41		257
42	ev_tstamp	258	ev_tstamp
43	ev_time (void)	259	ev_time (void)
44	{	260	{
45	#if HAVE_REALTIME	261	#if EV_USE_REALTIME
46	struct timespec ts;	262	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	263	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	264	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	265	#else
50	struct timeval tv;	266	struct timeval tv;
51	gettimeofday (&tv, 0);	267	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	268	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	269	#endif
54	}	270	}
55		271
56	static ev_tstamp	272	inline ev_tstamp
57	get_clock (void)	273	get_clock (void)
58	{	274	{
59	#if HAVE_MONOTONIC	275	#if EV_USE_MONOTONIC
60	if (have_monotonic)	276	if (expect_true (have_monotonic))
61	{	277	{
62	struct timespec ts;	278	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	279	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	280	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	281	}
66	#endif	282	#endif
67		283
68	return ev_time ();	284	return ev_time ();
69	}	285	}
70		286
		287	#if EV_MULTIPLICITY
		288	ev_tstamp
		289	ev_now (EV_P)
		290	{
		291	return ev_rt_now;
		292	}
		293	#endif
		294
		295	#define array_roundsize(type,n) ((n) | 4 & ~3)
		296
71	#define array_needsize(base,cur,cnt,init) \	297	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	298	if (expect_false ((cnt) > cur)) \
73	{ \	299	{ \
74	int newcnt = cur ? cur << 1 : 16; \	300	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	301	do \
		302	{ \
		303	newcnt = array_roundsize (type, newcnt << 1); \
		304	} \
		305	while ((cnt) > newcnt); \
		306	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	307	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	308	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	309	cur = newcnt; \
79	}	310	}
80		311
81	typedef struct	312	#define array_slim(type,stem) \
82	{	313	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	314	{ \
84	unsigned char wev, rev; /* want, received event set */	315	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	316	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		317	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		318	}
86		319
87	static ANFD *anfds;	320	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
88	static int anfdmax;	321	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		322	#define array_free_microshit(stem) \
		323	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
89		324
90	static int *fdchanges;	325	#define array_free(stem, idx) \
91	static int fdchangemax, fdchangecnt;	326	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		327
		328	/*****************************************************************************/
92		329
93	static void	330	static void
94	anfds_init (ANFD *base, int count)	331	anfds_init (ANFD *base, int count)
95	{	332	{
96	while (count--)	333	while (count--)
97	{	334	{
98	base->head = 0;	335	base->head = 0;
99	base->wev = base->rev = EV_NONE;	336	base->events = EV_NONE;
		337	base->reify = 0;
		338
100	++base;	339	++base;
101	}	340	}
102	}	341	}
103		342
104	typedef struct	343	void
		344	ev_feed_event (EV_P_ void *w, int revents)
105	{	345	{
106	struct ev_watcher *w;	346	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		347
110	static ANPENDING *pendings;	348	if (w_->pending)
111	static int pendingmax, pendingcnt;	349	{
		350	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		351	return;
		352	}
112		353
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	354	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	355	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
118	pendings [pendingcnt - 1].w = w;	356	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	357	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	358	}
121		359
122	static void	360	static void
		361	queue_events (EV_P_ W *events, int eventcnt, int type)
		362	{
		363	int i;
		364
		365	for (i = 0; i < eventcnt; ++i)
		366	ev_feed_event (EV_A_ events [i], type);
		367	}
		368
		369	inline void
123	fd_event (int fd, int events)	370	fd_event (EV_P_ int fd, int revents)
124	{	371	{
125	ANFD *anfd = anfds + fd;	372	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	373	struct ev_io *w;
127		374
128	for (w = anfd->head; w; w = w->next)	375	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	376	{
130	int ev = w->events & events;	377	int ev = w->events & revents;
131		378
132	if (ev)	379	if (ev)
133	event ((struct ev_watcher *)w, ev);	380	ev_feed_event (EV_A_ (W)w, ev);
		381	}
		382	}
		383
		384	void
		385	ev_feed_fd_event (EV_P_ int fd, int revents)
		386	{
		387	fd_event (EV_A_ fd, revents);
		388	}
		389
		390	/*****************************************************************************/
		391
		392	static void
		393	fd_reify (EV_P)
		394	{
		395	int i;
		396
		397	for (i = 0; i < fdchangecnt; ++i)
		398	{
		399	int fd = fdchanges [i];
		400	ANFD *anfd = anfds + fd;
		401	struct ev_io *w;
		402
		403	int events = 0;
		404
		405	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		406	events |= w->events;
		407
		408	anfd->reify = 0;
		409
		410	method_modify (EV_A_ fd, anfd->events, events);
		411	anfd->events = events;
		412	}
		413
		414	fdchangecnt = 0;
		415	}
		416
		417	static void
		418	fd_change (EV_P_ int fd)
		419	{
		420	if (anfds [fd].reify)
		421	return;
		422
		423	anfds [fd].reify = 1;
		424
		425	++fdchangecnt;
		426	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		427	fdchanges [fdchangecnt - 1] = fd;
		428	}
		429
		430	static void
		431	fd_kill (EV_P_ int fd)
		432	{
		433	struct ev_io *w;
		434
		435	while ((w = (struct ev_io *)anfds [fd].head))
		436	{
		437	ev_io_stop (EV_A_ w);
		438	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		439	}
		440	}
		441
		442	static int
		443	fd_valid (int fd)
		444	{
		445	#ifdef WIN32
		446	return !!win32_get_osfhandle (fd);
		447	#else
		448	return fcntl (fd, F_GETFD) != -1;
		449	#endif
		450	}
		451
		452	/* called on EBADF to verify fds */
		453	static void
		454	fd_ebadf (EV_P)
		455	{
		456	int fd;
		457
		458	for (fd = 0; fd < anfdmax; ++fd)
		459	if (anfds [fd].events)
		460	if (!fd_valid (fd) == -1 && errno == EBADF)
		461	fd_kill (EV_A_ fd);
		462	}
		463
		464	/* called on ENOMEM in select/poll to kill some fds and retry */
		465	static void
		466	fd_enomem (EV_P)
		467	{
		468	int fd;
		469
		470	for (fd = anfdmax; fd--; )
		471	if (anfds [fd].events)
		472	{
		473	fd_kill (EV_A_ fd);
		474	return;
134	}	475	}
135	}	476	}
136		477
137	static struct ev_timer **atimers;	478	/* usually called after fork if method 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	479	static void
144	upheap (struct ev_timer **timers, int k)	480	fd_rearm_all (EV_P)
145	{	481	{
146	struct ev_timer *w = timers [k];	482	int fd;
147		483
		484	/* this should be highly optimised to not do anything but set a flag */
		485	for (fd = 0; fd < anfdmax; ++fd)
		486	if (anfds [fd].events)
		487	{
		488	anfds [fd].events = 0;
		489	fd_change (EV_A_ fd);
		490	}
		491	}
		492
		493	/*****************************************************************************/
		494
		495	static void
		496	upheap (WT *heap, int k)
		497	{
		498	WT w = heap [k];
		499
148	while (k && timers [k >> 1]->at > w->at)	500	while (k && heap [k >> 1]->at > w->at)
149	{	501	{
150	timers [k] = timers [k >> 1];	502	heap [k] = heap [k >> 1];
151	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
152	k >>= 1;	504	k >>= 1;
153	}	505	}
154		506
155	timers [k] = w;	507	heap [k] = w;
156	timers [k]->active = k + 1;	508	((W)heap [k])->active = k + 1;
157		509
158	}	510	}
159		511
160	static void	512	static void
161	downheap (struct ev_timer **timers, int N, int k)	513	downheap (WT *heap, int N, int k)
162	{	514	{
163	struct ev_timer *w = timers [k];	515	WT w = heap [k];
164		516
165	while (k < (N >> 1))	517	while (k < (N >> 1))
166	{	518	{
167	int j = k << 1;	519	int j = k << 1;
168		520
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	521	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
170	++j;	522	++j;
171		523
172	if (w->at <= timers [j]->at)	524	if (w->at <= heap [j]->at)
173	break;	525	break;
174		526
175	timers [k] = timers [j];	527	heap [k] = heap [j];
176	timers [k]->active = k + 1;	528	((W)heap [k])->active = k + 1;
177	k = j;	529	k = j;
178	}	530	}
179		531
180	timers [k] = w;	532	heap [k] = w;
181	timers [k]->active = k + 1;	533	((W)heap [k])->active = k + 1;
182	}	534	}
183		535
184	static struct ev_signal **signals;	536	inline void
		537	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		538	{
		539	ev_tstamp old_at = heap [k]->at;
		540	heap [k]->at = at;
		541
		542	if (old_at < at)
		543	downheap (heap, N, k);
		544	else
		545	upheap (heap, k);
		546	}
		547
		548	/*****************************************************************************/
		549
		550	typedef struct
		551	{
		552	WL head;
		553	sig_atomic_t volatile gotsig;
		554	} ANSIG;
		555
		556	static ANSIG *signals;
185	static int signalmax;	557	static int signalmax;
186		558
		559	static int sigpipe [2];
		560	static sig_atomic_t volatile gotsig;
		561	static struct ev_io sigev;
		562
187	static void	563	static void
188	signals_init (struct ev_signal **base, int count)	564	signals_init (ANSIG *base, int count)
189	{	565	{
190	while (count--)	566	while (count--)
191	*base++ = 0;	567	{
192	}	568	base->head = 0;
		569	base->gotsig = 0;
193		570
		571	++base;
		572	}
		573	}
		574
		575	static void
		576	sighandler (int signum)
		577	{
		578	#if WIN32
		579	signal (signum, sighandler);
		580	#endif
		581
		582	signals [signum - 1].gotsig = 1;
		583
		584	if (!gotsig)
		585	{
		586	int old_errno = errno;
		587	gotsig = 1;
		588	#ifdef WIN32
		589	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		590	#else
		591	write (sigpipe [1], &signum, 1);
		592	#endif
		593	errno = old_errno;
		594	}
		595	}
		596
		597	void
		598	ev_feed_signal_event (EV_P_ int signum)
		599	{
		600	WL w;
		601
		602	#if EV_MULTIPLICITY
		603	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		604	#endif
		605
		606	--signum;
		607
		608	if (signum < 0 || signum >= signalmax)
		609	return;
		610
		611	signals [signum].gotsig = 0;
		612
		613	for (w = signals [signum].head; w; w = w->next)
		614	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		615	}
		616
		617	static void
		618	sigcb (EV_P_ struct ev_io *iow, int revents)
		619	{
		620	int signum;
		621
		622	#ifdef WIN32
		623	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		624	#else
		625	read (sigpipe [0], &revents, 1);
		626	#endif
		627	gotsig = 0;
		628
		629	for (signum = signalmax; signum--; )
		630	if (signals [signum].gotsig)
		631	ev_feed_signal_event (EV_A_ signum + 1);
		632	}
		633
		634	static void
		635	siginit (EV_P)
		636	{
		637	#ifndef WIN32
		638	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		639	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		640
		641	/* rather than sort out wether we really need nb, set it */
		642	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		643	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		644	#endif
		645
		646	ev_io_set (&sigev, sigpipe [0], EV_READ);
		647	ev_io_start (EV_A_ &sigev);
		648	ev_unref (EV_A); /* child watcher should not keep loop alive */
		649	}
		650
		651	/*****************************************************************************/
		652
		653	static struct ev_child *childs [PID_HASHSIZE];
		654
		655	#ifndef WIN32
		656
		657	static struct ev_signal childev;
		658
		659	#ifndef WCONTINUED
		660	# define WCONTINUED 0
		661	#endif
		662
		663	static void
		664	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		665	{
		666	struct ev_child *w;
		667
		668	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		669	if (w->pid == pid || !w->pid)
		670	{
		671	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		672	w->rpid = pid;
		673	w->rstatus = status;
		674	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		675	}
		676	}
		677
		678	static void
		679	childcb (EV_P_ struct ev_signal *sw, int revents)
		680	{
		681	int pid, status;
		682
		683	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		684	{
		685	/* make sure we are called again until all childs have been reaped */
		686	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		687
		688	child_reap (EV_A_ sw, pid, pid, status);
		689	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		690	}
		691	}
		692
		693	#endif
		694
		695	/*****************************************************************************/
		696
		697	#if EV_USE_KQUEUE
		698	# include "ev_kqueue.c"
		699	#endif
194	#if HAVE_EPOLL	700	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	701	# include "ev_epoll.c"
196	#endif	702	#endif
		703	#if EV_USE_POLL
		704	# include "ev_poll.c"
		705	#endif
197	#if HAVE_SELECT	706	#if EV_USE_SELECT
198	# include "ev_select.c"	707	# include "ev_select.c"
199	#endif	708	#endif
200		709
201	int ev_init (int flags)	710	int
		711	ev_version_major (void)
202	{	712	{
		713	return EV_VERSION_MAJOR;
		714	}
		715
		716	int
		717	ev_version_minor (void)
		718	{
		719	return EV_VERSION_MINOR;
		720	}
		721
		722	/* return true if we are running with elevated privileges and should ignore env variables */
		723	static int
		724	enable_secure (void)
		725	{
		726	#ifdef WIN32
		727	return 0;
		728	#else
		729	return getuid () != geteuid ()
		730	|| getgid () != getegid ();
		731	#endif
		732	}
		733
		734	int
		735	ev_method (EV_P)
		736	{
		737	return method;
		738	}
		739
		740	static void
		741	loop_init (EV_P_ int methods)
		742	{
		743	if (!method)
		744	{
203	#if HAVE_MONOTONIC	745	#if EV_USE_MONOTONIC
204	{	746	{
205	struct timespec ts;	747	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	748	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	749	have_monotonic = 1;
208	}	750	}
209	#endif	751	#endif
210		752
211	ev_now = ev_time ();	753	ev_rt_now = ev_time ();
212	now = get_clock ();	754	mn_now = get_clock ();
213	diff = ev_now - now;	755	now_floor = mn_now;
		756	rtmn_diff = ev_rt_now - mn_now;
214		757
		758	if (methods == EVMETHOD_AUTO)
		759	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		760	methods = atoi (getenv ("LIBEV_METHODS"));
		761	else
		762	methods = EVMETHOD_ANY;
		763
		764	method = 0;
		765	#if EV_USE_WIN32
		766	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		767	#endif
		768	#if EV_USE_KQUEUE
		769	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		770	#endif
215	#if HAVE_EPOLL	771	#if EV_USE_EPOLL
216	if (epoll_init (flags))	772	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
217	return ev_method;
218	#endif	773	#endif
		774	#if EV_USE_POLL
		775	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		776	#endif
219	#if HAVE_SELECT	777	#if EV_USE_SELECT
220	if (select_init (flags))	778	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
221	return ev_method;
222	#endif	779	#endif
223		780
224	ev_method = EVMETHOD_NONE;	781	ev_init (&sigev, sigcb);
225	return ev_method;	782	ev_set_priority (&sigev, EV_MAXPRI);
		783	}
226	}	784	}
227		785
228	void ev_prefork (void)	786	void
229	{	787	loop_destroy (EV_P)
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
244	call_pending ()
245	{	788	{
246	int i;	789	int i;
247		790
248	for (i = 0; i < pendingcnt; ++i)	791	#if EV_USE_WIN32
		792	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		793	#endif
		794	#if EV_USE_KQUEUE
		795	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		796	#endif
		797	#if EV_USE_EPOLL
		798	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		799	#endif
		800	#if EV_USE_POLL
		801	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		802	#endif
		803	#if EV_USE_SELECT
		804	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		805	#endif
		806
		807	for (i = NUMPRI; i--; )
		808	array_free (pending, [i]);
		809
		810	/* have to use the microsoft-never-gets-it-right macro */
		811	array_free_microshit (fdchange);
		812	array_free_microshit (timer);
		813	#if EV_PERIODICS
		814	array_free_microshit (periodic);
		815	#endif
		816	array_free_microshit (idle);
		817	array_free_microshit (prepare);
		818	array_free_microshit (check);
		819
		820	method = 0;
		821	}
		822
		823	static void
		824	loop_fork (EV_P)
		825	{
		826	#if EV_USE_EPOLL
		827	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		828	#endif
		829	#if EV_USE_KQUEUE
		830	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		831	#endif
		832
		833	if (ev_is_active (&sigev))
		834	{
		835	/* default loop */
		836
		837	ev_ref (EV_A);
		838	ev_io_stop (EV_A_ &sigev);
		839	close (sigpipe [0]);
		840	close (sigpipe [1]);
		841
		842	while (pipe (sigpipe))
		843	syserr ("(libev) error creating pipe");
		844
		845	siginit (EV_A);
249	{	846	}
250	ANPENDING *p = pendings + i;
251		847
252	if (p->w)	848	postfork = 0;
		849	}
		850
		851	#if EV_MULTIPLICITY
		852	struct ev_loop *
		853	ev_loop_new (int methods)
		854	{
		855	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		856
		857	memset (loop, 0, sizeof (struct ev_loop));
		858
		859	loop_init (EV_A_ methods);
		860
		861	if (ev_method (EV_A))
		862	return loop;
		863
		864	return 0;
		865	}
		866
		867	void
		868	ev_loop_destroy (EV_P)
		869	{
		870	loop_destroy (EV_A);
		871	ev_free (loop);
		872	}
		873
		874	void
		875	ev_loop_fork (EV_P)
		876	{
		877	postfork = 1;
		878	}
		879
		880	#endif
		881
		882	#if EV_MULTIPLICITY
		883	struct ev_loop *
		884	#else
		885	int
		886	#endif
		887	ev_default_loop (int methods)
		888	{
		889	if (sigpipe [0] == sigpipe [1])
		890	if (pipe (sigpipe))
		891	return 0;
		892
		893	if (!default_loop)
		894	{
		895	#if EV_MULTIPLICITY
		896	struct ev_loop *loop = default_loop = &default_loop_struct;
		897	#else
		898	default_loop = 1;
		899	#endif
		900
		901	loop_init (EV_A_ methods);
		902
		903	if (ev_method (EV_A))
253	{	904	{
254	p->w->pending = 0;	905	siginit (EV_A);
255	p->w->cb (p->w, p->events);	906
		907	#ifndef WIN32
		908	ev_signal_init (&childev, childcb, SIGCHLD);
		909	ev_set_priority (&childev, EV_MAXPRI);
		910	ev_signal_start (EV_A_ &childev);
		911	ev_unref (EV_A); /* child watcher should not keep loop alive */
		912	#endif
256	}	913	}
		914	else
		915	default_loop = 0;
		916	}
		917
		918	return default_loop;
		919	}
		920
		921	void
		922	ev_default_destroy (void)
		923	{
		924	#if EV_MULTIPLICITY
		925	struct ev_loop *loop = default_loop;
		926	#endif
		927
		928	#ifndef WIN32
		929	ev_ref (EV_A); /* child watcher */
		930	ev_signal_stop (EV_A_ &childev);
		931	#endif
		932
		933	ev_ref (EV_A); /* signal watcher */
		934	ev_io_stop (EV_A_ &sigev);
		935
		936	close (sigpipe [0]); sigpipe [0] = 0;
		937	close (sigpipe [1]); sigpipe [1] = 0;
		938
		939	loop_destroy (EV_A);
		940	}
		941
		942	void
		943	ev_default_fork (void)
		944	{
		945	#if EV_MULTIPLICITY
		946	struct ev_loop *loop = default_loop;
		947	#endif
		948
		949	if (method)
		950	postfork = 1;
		951	}
		952
		953	/*****************************************************************************/
		954
		955	static int
		956	any_pending (EV_P)
		957	{
		958	int pri;
		959
		960	for (pri = NUMPRI; pri--; )
		961	if (pendingcnt [pri])
		962	return 1;
		963
		964	return 0;
		965	}
		966
		967	static void
		968	call_pending (EV_P)
		969	{
		970	int pri;
		971
		972	for (pri = NUMPRI; pri--; )
		973	while (pendingcnt [pri])
		974	{
		975	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		976
		977	if (p->w)
		978	{
		979	p->w->pending = 0;
		980	EV_CB_INVOKE (p->w, p->events);
		981	}
257	}	982	}
258
259	pendingcnt = 0;
260	}	983	}
261		984
262	static void	985	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	986	timers_reify (EV_P)
264	{	987	{
265	while (timercnt && timers [0]->at <= now)	988	while (timercnt && ((WT)timers [0])->at <= mn_now)
266	{	989	{
267	struct ev_timer *w = timers [0];	990	struct ev_timer *w = timers [0];
		991
		992	assert (("inactive timer on timer heap detected", ev_is_active (w)));
268		993
269	/* first reschedule or stop timer */	994	/* first reschedule or stop timer */
270	if (w->repeat)	995	if (w->repeat)
271	{	996	{
272	if (w->is_abs)	997	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;	998
274	else
275	w->at = now + w->repeat;	999	((WT)w)->at += w->repeat;
		1000	if (((WT)w)->at < mn_now)
		1001	((WT)w)->at = mn_now;
276		1002
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	1003	downheap ((WT *)timers, timercnt, 0);
280	}	1004	}
281	else	1005	else
		1006	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1007
		1008	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1009	}
		1010	}
		1011
		1012	#if EV_PERIODICS
		1013	static void
		1014	periodics_reify (EV_P)
		1015	{
		1016	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1017	{
		1018	struct ev_periodic *w = periodics [0];
		1019
		1020	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1021
		1022	/* first reschedule or stop timer */
		1023	if (w->reschedule_cb)
282	{	1024	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	1025	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
284	--timercnt; /* maybe pass by reference instead? */	1026
		1027	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1028	downheap ((WT *)periodics, periodiccnt, 0);
285	}	1029	}
		1030	else if (w->interval)
		1031	{
		1032	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1033	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1034	downheap ((WT *)periodics, periodiccnt, 0);
		1035	}
		1036	else
		1037	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
286		1038
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	1039	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
288	}	1040	}
289	}	1041	}
290		1042
291	static void	1043	static void
292	time_update ()	1044	periodics_reschedule (EV_P)
293	{	1045	{
294	int i;	1046	int i;
		1047
		1048	/* adjust periodics after time jump */
		1049	for (i = 0; i < periodiccnt; ++i)
		1050	{
		1051	struct ev_periodic *w = periodics [i];
		1052
		1053	if (w->reschedule_cb)
		1054	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1055	else if (w->interval)
		1056	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1057	}
		1058
		1059	/* now rebuild the heap */
		1060	for (i = periodiccnt >> 1; i--; )
		1061	downheap ((WT *)periodics, periodiccnt, i);
		1062	}
		1063	#endif
		1064
		1065	inline int
		1066	time_update_monotonic (EV_P)
		1067	{
		1068	mn_now = get_clock ();
		1069
		1070	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1071	{
		1072	ev_rt_now = rtmn_diff + mn_now;
		1073	return 0;
		1074	}
		1075	else
		1076	{
		1077	now_floor = mn_now;
295	ev_now = ev_time ();	1078	ev_rt_now = ev_time ();
296		1079	return 1;
297	if (have_monotonic)
298	{	1080	}
299	ev_tstamp odiff = diff;	1081	}
300		1082
301	/* detecting time jumps is much more difficult */	1083	static void
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1084	time_update (EV_P)
		1085	{
		1086	int i;
		1087
		1088	#if EV_USE_MONOTONIC
		1089	if (expect_true (have_monotonic))
		1090	{
		1091	if (time_update_monotonic (EV_A))
303	{	1092	{
304	now = get_clock ();	1093	ev_tstamp odiff = rtmn_diff;
		1094
		1095	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1096	{
305	diff = ev_now - now;	1097	rtmn_diff = ev_rt_now - mn_now;
306		1098
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1099	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
308	return; /* all is well */	1100	return; /* all is well */
309		1101
310	ev_now = ev_time ();	1102	ev_rt_now = ev_time ();
		1103	mn_now = get_clock ();
		1104	now_floor = mn_now;
		1105	}
		1106
		1107	# if EV_PERIODICS
		1108	periodics_reschedule (EV_A);
		1109	# endif
		1110	/* no timer adjustment, as the monotonic clock doesn't jump */
		1111	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
311	}	1112	}
		1113	}
		1114	else
		1115	#endif
		1116	{
		1117	ev_rt_now = ev_time ();
312		1118
313	/* time jump detected, reschedule atimers */	1119	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	{	1120	{
316	struct ev_timer *w = atimers [i];	1121	#if EV_PERIODICS
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1122	periodics_reschedule (EV_A);
		1123	#endif
		1124
		1125	/* adjust timers. this is easy, as the offset is the same for all */
		1126	for (i = 0; i < timercnt; ++i)
		1127	((WT)timers [i])->at += ev_rt_now - mn_now;
318	}	1128	}
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		1129
327	now = ev_now;	1130	mn_now = ev_rt_now;
328	}	1131	}
329	}	1132	}
330		1133
331	int ev_loop_done;	1134	void
		1135	ev_ref (EV_P)
		1136	{
		1137	++activecnt;
		1138	}
332		1139
		1140	void
		1141	ev_unref (EV_P)
		1142	{
		1143	--activecnt;
		1144	}
		1145
		1146	static int loop_done;
		1147
		1148	void
333	void ev_loop (int flags)	1149	ev_loop (EV_P_ int flags)
334	{	1150	{
335	double block;	1151	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	1152	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
337		1153
338	do	1154	do
339	{	1155	{
		1156	/* queue check watchers (and execute them) */
		1157	if (expect_false (preparecnt))
		1158	{
		1159	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1160	call_pending (EV_A);
		1161	}
		1162
		1163	/* we might have forked, so reify kernel state if necessary */
		1164	if (expect_false (postfork))
		1165	loop_fork (EV_A);
		1166
340	/* update fd-related kernel structures */	1167	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	1168	fd_reify (EV_A);
342		1169
343	/* calculate blocking time */	1170	/* calculate blocking time */
		1171
		1172	/* we only need this for !monotonic clock or timers, but as we basically
		1173	always have timers, we just calculate it always */
		1174	#if EV_USE_MONOTONIC
		1175	if (expect_true (have_monotonic))
		1176	time_update_monotonic (EV_A);
		1177	else
		1178	#endif
		1179	{
		1180	ev_rt_now = ev_time ();
		1181	mn_now = ev_rt_now;
		1182	}
		1183
344	if (flags & EVLOOP_NONBLOCK)	1184	if (flags & EVLOOP_NONBLOCK || idlecnt)
345	block = 0.;	1185	block = 0.;
346	else	1186	else
347	{	1187	{
348	block = MAX_BLOCKTIME;	1188	block = MAX_BLOCKTIME;
349		1189
350	if (rtimercnt)	1190	if (timercnt)
351	{	1191	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1192	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
353	if (block > to) block = to;	1193	if (block > to) block = to;
354	}	1194	}
355		1195
		1196	#if EV_PERIODICS
356	if (atimercnt)	1197	if (periodiccnt)
357	{	1198	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1199	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
359	if (block > to) block = to;	1200	if (block > to) block = to;
360	}	1201	}
		1202	#endif
361		1203
362	if (block < 0.) block = 0.;	1204	if (block < 0.) block = 0.;
363	}	1205	}
364		1206
365	method_poll (block);	1207	method_poll (EV_A_ block);
366		1208
367	/* update ev_now, do magic */	1209	/* update ev_rt_now, do magic */
368	time_update ();	1210	time_update (EV_A);
369		1211
370	/* put pending timers into pendign queue and reschedule them */	1212	/* queue pending timers and reschedule them */
371	/* absolute timers first */	1213	timers_reify (EV_A); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	1214	#if EV_PERIODICS
373	/* relative timers second */	1215	periodics_reify (EV_A); /* absolute timers called first */
374	timers_reify (rtimers, rtimercnt, now);	1216	#endif
375		1217
		1218	/* queue idle watchers unless io or timers are pending */
		1219	if (idlecnt && !any_pending (EV_A))
		1220	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1221
		1222	/* queue check watchers, to be executed first */
		1223	if (checkcnt)
		1224	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1225
376	call_pending ();	1226	call_pending (EV_A);
377	}	1227	}
378	while (!ev_loop_done);	1228	while (activecnt && !loop_done);
379	}
380		1229
381	static void	1230	if (loop_done != 2)
382	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1231	loop_done = 0;
		1232	}
		1233
		1234	void
		1235	ev_unloop (EV_P_ int how)
		1236	{
		1237	loop_done = how;
		1238	}
		1239
		1240	/*****************************************************************************/
		1241
		1242	inline void
		1243	wlist_add (WL *head, WL elem)
383	{	1244	{
384	elem->next = *head;	1245	elem->next = *head;
385	*head = elem;	1246	*head = elem;
386	}	1247	}
387		1248
388	static void	1249	inline void
389	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1250	wlist_del (WL *head, WL elem)
390	{	1251	{
391	while (*head)	1252	while (*head)
392	{	1253	{
393	if (*head == elem)	1254	if (*head == elem)
394	{	1255	{
…		…
398		1259
399	head = &(*head)->next;	1260	head = &(*head)->next;
400	}	1261	}
401	}	1262	}
402		1263
403	static void	1264	inline void
404	ev_start (struct ev_watcher *w, int active)	1265	ev_clear_pending (EV_P_ W w)
405	{	1266	{
		1267	if (w->pending)
		1268	{
		1269	pendings [ABSPRI (w)][w->pending - 1].w = 0;
406	w->pending = 0;	1270	w->pending = 0;
		1271	}
		1272	}
		1273
		1274	inline void
		1275	ev_start (EV_P_ W w, int active)
		1276	{
		1277	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1278	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1279
407	w->active = active;	1280	w->active = active;
		1281	ev_ref (EV_A);
408	}	1282	}
409		1283
410	static void	1284	inline void
411	ev_stop (struct ev_watcher *w)	1285	ev_stop (EV_P_ W w)
412	{	1286	{
413	if (w->pending)	1287	ev_unref (EV_A);
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	1288	w->active = 0;
417	/* nop */
418	}	1289	}
419		1290
		1291	/*****************************************************************************/
		1292
420	void	1293	void
421	evio_start (struct ev_io *w)	1294	ev_io_start (EV_P_ struct ev_io *w)
422	{	1295	{
		1296	int fd = w->fd;
		1297
423	if (ev_is_active (w))	1298	if (ev_is_active (w))
424	return;	1299	return;
425		1300
426	int fd = w->fd;	1301	assert (("ev_io_start called with negative fd", fd >= 0));
427		1302
428	ev_start ((struct ev_watcher *)w, 1);	1303	ev_start (EV_A_ (W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1304	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1305	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		1306
432	++fdchangecnt;	1307	fd_change (EV_A_ fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	1308	}
436		1309
437	void	1310	void
438	evio_stop (struct ev_io *w)	1311	ev_io_stop (EV_P_ struct ev_io *w)
439	{	1312	{
		1313	ev_clear_pending (EV_A_ (W)w);
440	if (!ev_is_active (w))	1314	if (!ev_is_active (w))
441	return;	1315	return;
442		1316
443	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1317	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
444	ev_stop ((struct ev_watcher *)w);
445		1318
446	++fdchangecnt;	1319	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1320	ev_stop (EV_A_ (W)w);
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}
450		1321
		1322	fd_change (EV_A_ w->fd);
		1323	}
		1324
451	void	1325	void
452	evtimer_start (struct ev_timer *w)	1326	ev_timer_start (EV_P_ struct ev_timer *w)
453	{	1327	{
454	if (ev_is_active (w))	1328	if (ev_is_active (w))
455	return;	1329	return;
456		1330
457	if (w->is_abs)	1331	((WT)w)->at += mn_now;
		1332
		1333	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1334
		1335	ev_start (EV_A_ (W)w, ++timercnt);
		1336	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1337	timers [timercnt - 1] = w;
		1338	upheap ((WT *)timers, timercnt - 1);
		1339
		1340	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1341	}
		1342
		1343	void
		1344	ev_timer_stop (EV_P_ struct ev_timer *w)
		1345	{
		1346	ev_clear_pending (EV_A_ (W)w);
		1347	if (!ev_is_active (w))
		1348	return;
		1349
		1350	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1351
		1352	if (((W)w)->active < timercnt--)
		1353	{
		1354	timers [((W)w)->active - 1] = timers [timercnt];
		1355	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
458	{	1356	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	1357
		1358	((WT)w)->at -= mn_now;
		1359
		1360	ev_stop (EV_A_ (W)w);
		1361	}
		1362
		1363	void
		1364	ev_timer_again (EV_P_ struct ev_timer *w)
		1365	{
		1366	if (ev_is_active (w))
		1367	{
460	if (w->repeat)	1368	if (w->repeat)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1369	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1370	else
		1371	ev_timer_stop (EV_A_ w);
		1372	}
		1373	else if (w->repeat)
		1374	ev_timer_start (EV_A_ w);
		1375	}
462		1376
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	1377	#if EV_PERIODICS
464	array_needsize (atimers, atimermax, atimercnt, );	1378	void
465	atimers [atimercnt - 1] = w;	1379	ev_periodic_start (EV_P_ struct ev_periodic *w)
466	upheap (atimers, atimercnt - 1);	1380	{
		1381	if (ev_is_active (w))
		1382	return;
		1383
		1384	if (w->reschedule_cb)
		1385	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1386	else if (w->interval)
467	}	1387	{
		1388	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1389	/* this formula differs from the one in periodic_reify because we do not always round up */
		1390	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1391	}
		1392
		1393	ev_start (EV_A_ (W)w, ++periodiccnt);
		1394	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1395	periodics [periodiccnt - 1] = w;
		1396	upheap ((WT *)periodics, periodiccnt - 1);
		1397
		1398	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1399	}
		1400
		1401	void
		1402	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1403	{
		1404	ev_clear_pending (EV_A_ (W)w);
		1405	if (!ev_is_active (w))
		1406	return;
		1407
		1408	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1409
		1410	if (((W)w)->active < periodiccnt--)
		1411	{
		1412	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1413	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1414	}
		1415
		1416	ev_stop (EV_A_ (W)w);
		1417	}
		1418
		1419	void
		1420	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1421	{
		1422	/* TODO: use adjustheap and recalculation */
		1423	ev_periodic_stop (EV_A_ w);
		1424	ev_periodic_start (EV_A_ w);
		1425	}
		1426	#endif
		1427
		1428	void
		1429	ev_idle_start (EV_P_ struct ev_idle *w)
		1430	{
		1431	if (ev_is_active (w))
		1432	return;
		1433
		1434	ev_start (EV_A_ (W)w, ++idlecnt);
		1435	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1436	idles [idlecnt - 1] = w;
		1437	}
		1438
		1439	void
		1440	ev_idle_stop (EV_P_ struct ev_idle *w)
		1441	{
		1442	ev_clear_pending (EV_A_ (W)w);
		1443	if (ev_is_active (w))
		1444	return;
		1445
		1446	idles [((W)w)->active - 1] = idles [--idlecnt];
		1447	ev_stop (EV_A_ (W)w);
		1448	}
		1449
		1450	void
		1451	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1452	{
		1453	if (ev_is_active (w))
		1454	return;
		1455
		1456	ev_start (EV_A_ (W)w, ++preparecnt);
		1457	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1458	prepares [preparecnt - 1] = w;
		1459	}
		1460
		1461	void
		1462	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1463	{
		1464	ev_clear_pending (EV_A_ (W)w);
		1465	if (ev_is_active (w))
		1466	return;
		1467
		1468	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1469	ev_stop (EV_A_ (W)w);
		1470	}
		1471
		1472	void
		1473	ev_check_start (EV_P_ struct ev_check *w)
		1474	{
		1475	if (ev_is_active (w))
		1476	return;
		1477
		1478	ev_start (EV_A_ (W)w, ++checkcnt);
		1479	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1480	checks [checkcnt - 1] = w;
		1481	}
		1482
		1483	void
		1484	ev_check_stop (EV_P_ struct ev_check *w)
		1485	{
		1486	ev_clear_pending (EV_A_ (W)w);
		1487	if (!ev_is_active (w))
		1488	return;
		1489
		1490	checks [((W)w)->active - 1] = checks [--checkcnt];
		1491	ev_stop (EV_A_ (W)w);
		1492	}
		1493
		1494	#ifndef SA_RESTART
		1495	# define SA_RESTART 0
		1496	#endif
		1497
		1498	void
		1499	ev_signal_start (EV_P_ struct ev_signal *w)
		1500	{
		1501	#if EV_MULTIPLICITY
		1502	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1503	#endif
		1504	if (ev_is_active (w))
		1505	return;
		1506
		1507	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1508
		1509	ev_start (EV_A_ (W)w, 1);
		1510	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1511	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1512
		1513	if (!((WL)w)->next)
		1514	{
		1515	#if WIN32
		1516	signal (w->signum, sighandler);
		1517	#else
		1518	struct sigaction sa;
		1519	sa.sa_handler = sighandler;
		1520	sigfillset (&sa.sa_mask);
		1521	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1522	sigaction (w->signum, &sa, 0);
		1523	#endif
		1524	}
		1525	}
		1526
		1527	void
		1528	ev_signal_stop (EV_P_ struct ev_signal *w)
		1529	{
		1530	ev_clear_pending (EV_A_ (W)w);
		1531	if (!ev_is_active (w))
		1532	return;
		1533
		1534	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1535	ev_stop (EV_A_ (W)w);
		1536
		1537	if (!signals [w->signum - 1].head)
		1538	signal (w->signum, SIG_DFL);
		1539	}
		1540
		1541	void
		1542	ev_child_start (EV_P_ struct ev_child *w)
		1543	{
		1544	#if EV_MULTIPLICITY
		1545	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1546	#endif
		1547	if (ev_is_active (w))
		1548	return;
		1549
		1550	ev_start (EV_A_ (W)w, 1);
		1551	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1552	}
		1553
		1554	void
		1555	ev_child_stop (EV_P_ struct ev_child *w)
		1556	{
		1557	ev_clear_pending (EV_A_ (W)w);
		1558	if (!ev_is_active (w))
		1559	return;
		1560
		1561	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1562	ev_stop (EV_A_ (W)w);
		1563	}
		1564
		1565	/*****************************************************************************/
		1566
		1567	struct ev_once
		1568	{
		1569	struct ev_io io;
		1570	struct ev_timer to;
		1571	void (*cb)(int revents, void *arg);
		1572	void *arg;
		1573	};
		1574
		1575	static void
		1576	once_cb (EV_P_ struct ev_once *once, int revents)
		1577	{
		1578	void (*cb)(int revents, void *arg) = once->cb;
		1579	void *arg = once->arg;
		1580
		1581	ev_io_stop (EV_A_ &once->io);
		1582	ev_timer_stop (EV_A_ &once->to);
		1583	ev_free (once);
		1584
		1585	cb (revents, arg);
		1586	}
		1587
		1588	static void
		1589	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1590	{
		1591	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1592	}
		1593
		1594	static void
		1595	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1596	{
		1597	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1598	}
		1599
		1600	void
		1601	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1602	{
		1603	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1604
		1605	if (!once)
		1606	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
468	else	1607	else
469	{	1608	{
470	w->at += now;	1609	once->cb = cb;
		1610	once->arg = arg;
471		1611
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1612	ev_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1613	if (fd >= 0)
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{	1614	{
490	atimers [w->active - 1] = atimers [atimercnt];	1615	ev_io_set (&once->io, fd, events);
491	downheap (atimers, atimercnt, w->active - 1);	1616	ev_io_start (EV_A_ &once->io);
492	}	1617	}
493	}	1618
494	else	1619	ev_init (&once->to, once_cb_to);
495	{	1620	if (timeout >= 0.)
496	if (w->active < rtimercnt--)
497	{	1621	{
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1622	ev_timer_set (&once->to, timeout, 0.);
499	downheap (rtimers, rtimercnt, w->active - 1);	1623	ev_timer_start (EV_A_ &once->to);
500	}	1624	}
501	}	1625	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1626	}
505		1627
506	void	1628	#ifdef __cplusplus
507	evsignal_start (struct ev_signal *w)
508	{
509	if (ev_is_active (w))
510	return;
511
512	ev_start ((struct ev_watcher *)w, 1);
513	array_needsize (signals, signalmax, w->signum, signals_init);
514	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
515	}	1629	}
516
517	void
518	evsignal_stop (struct ev_signal *w)
519	{
520	if (!ev_is_active (w))
521	return;
522
523	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
524	ev_stop ((struct ev_watcher *)w);
525	}
526
527	/*****************************************************************************/
528	#if 1
529
530	static void
531	sin_cb (struct ev_io *w, int revents)
532	{
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;
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	1630	#endif
568		1631
569	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);
573
574	ev_loop (0);
575
576	return 0;
577	}
578
579	#endif
580
581
582
583

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