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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.85 by root, Sat Nov 10 03:13:50 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	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	59	#include <fcntl.h>
5	#include <signal.h>	60	#include <stddef.h>
6		61
7	#include <stdio.h>	62	#include <stdio.h>
8		63
9	#include <assert.h>	64	#include <assert.h>
10	#include <errno.h>	65	#include <errno.h>
11	#include <sys/time.h>	66	#include <sys/types.h>
12	#include <time.h>	67	#include <time.h>
13		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
14	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
16	#endif	117	#endif
17		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	122	#endif
20	#define HAVE_SELECT 1	123
		124	/**/
21		125
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
24		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
25	#include "ev.h"	134	# include "ev.h"
		135	#endif
26		136
		137	#if __GNUC__ >= 3
		138	# define expect(expr,value) __builtin_expect ((expr),(value))
		139	# define inline inline
		140	#else
		141	# define expect(expr,value) (expr)
		142	# define inline static
		143	#endif
		144
		145	#define expect_false(expr) expect ((expr) != 0, 0)
		146	#define expect_true(expr) expect ((expr) != 0, 1)
		147
		148	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		149	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		150
27	struct ev_watcher {	151	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	152	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	153	typedef struct ev_watcher_time *WT;
33	};
34		154
35	static ev_tstamp now, diff; /* monotonic clock */	155	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
36	ev_tstamp ev_now;
37	int ev_method;
38		156
39	static int have_monotonic; /* runtime */	157	#include "ev_win32.c"
40		158
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	159	/*****************************************************************************/
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		160
45	ev_tstamp	161	static void (*syserr_cb)(const char *msg);
		162
		163	void ev_set_syserr_cb (void (*cb)(const char *msg))
		164	{
		165	syserr_cb = cb;
		166	}
		167
		168	static void
		169	syserr (const char *msg)
		170	{
		171	if (!msg)
		172	msg = "(libev) system error";
		173
		174	if (syserr_cb)
		175	syserr_cb (msg);
		176	else
		177	{
		178	perror (msg);
		179	abort ();
		180	}
		181	}
		182
		183	static void *(*alloc)(void *ptr, long size);
		184
		185	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		186	{
		187	alloc = cb;
		188	}
		189
		190	static void *
		191	ev_realloc (void *ptr, long size)
		192	{
		193	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		194
		195	if (!ptr && size)
		196	{
		197	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		198	abort ();
		199	}
		200
		201	return ptr;
		202	}
		203
		204	#define ev_malloc(size) ev_realloc (0, (size))
		205	#define ev_free(ptr) ev_realloc ((ptr), 0)
		206
		207	/*****************************************************************************/
		208
		209	typedef struct
		210	{
		211	WL head;
		212	unsigned char events;
		213	unsigned char reify;
		214	} ANFD;
		215
		216	typedef struct
		217	{
		218	W w;
		219	int events;
		220	} ANPENDING;
		221
		222	#if EV_MULTIPLICITY
		223
		224	struct ev_loop
		225	{
		226	#define VAR(name,decl) decl;
		227	#include "ev_vars.h"
		228	#undef VAR
		229	};
		230	#include "ev_wrap.h"
		231
		232	struct ev_loop default_loop_struct;
		233	static struct ev_loop *default_loop;
		234
		235	#else
		236
		237	#define VAR(name,decl) static decl;
		238	#include "ev_vars.h"
		239	#undef VAR
		240
		241	static int default_loop;
		242
		243	#endif
		244
		245	/*****************************************************************************/
		246
		247	inline ev_tstamp
46	ev_time (void)	248	ev_time (void)
47	{	249	{
48	#if HAVE_REALTIME	250	#if EV_USE_REALTIME
49	struct timespec ts;	251	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	252	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	253	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	254	#else
53	struct timeval tv;	255	struct timeval tv;
54	gettimeofday (&tv, 0);	256	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	257	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	258	#endif
57	}	259	}
58		260
59	static ev_tstamp	261	inline ev_tstamp
60	get_clock (void)	262	get_clock (void)
61	{	263	{
62	#if HAVE_MONOTONIC	264	#if EV_USE_MONOTONIC
63	if (have_monotonic)	265	if (expect_true (have_monotonic))
64	{	266	{
65	struct timespec ts;	267	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	268	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	269	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	270	}
69	#endif	271	#endif
70		272
71	return ev_time ();	273	return ev_time ();
72	}	274	}
73		275
		276	#if EV_MULTIPLICITY
		277	ev_tstamp
		278	ev_now (EV_P)
		279	{
		280	return ev_rt_now;
		281	}
		282	#endif
		283
		284	#define array_roundsize(type,n) ((n) | 4 & ~3)
		285
74	#define array_needsize(base,cur,cnt,init) \	286	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	287	if (expect_false ((cnt) > cur)) \
76	{ \	288	{ \
77	int newcnt = cur ? cur << 1 : 16; \	289	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	290	do \
		291	{ \
		292	newcnt = array_roundsize (type, newcnt << 1); \
		293	} \
		294	while ((cnt) > newcnt); \
		295	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	296	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
80	init (base + cur, newcnt - cur); \	297	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	298	cur = newcnt; \
82	}	299	}
83		300
84	typedef struct	301	#define array_slim(type,stem) \
85	{	302	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	303	{ \
87	unsigned char wev, rev; /* want, received event set */	304	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	305	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		306	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		307	}
89		308
90	static ANFD *anfds;	309	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
91	static int anfdmax;	310	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		311	#define array_free_microshit(stem) \
		312	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
92		313
93	static int *fdchanges;	314	#define array_free(stem, idx) \
94	static int fdchangemax, fdchangecnt;	315	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		316
		317	/*****************************************************************************/
95		318
96	static void	319	static void
97	anfds_init (ANFD *base, int count)	320	anfds_init (ANFD *base, int count)
98	{	321	{
99	while (count--)	322	while (count--)
100	{	323	{
101	base->head = 0;	324	base->head = 0;
102	base->wev = base->rev = EV_NONE;	325	base->events = EV_NONE;
		326	base->reify = 0;
		327
103	++base;	328	++base;
104	}	329	}
105	}	330	}
106		331
107	typedef struct	332	void
		333	ev_feed_event (EV_P_ void *w, int revents)
108	{	334	{
109	struct ev_watcher *w;	335	W w_ = (W)w;
110	int events;
111	} ANPENDING;
112		336
113	static ANPENDING *pendings;	337	if (w_->pending)
114	static int pendingmax, pendingcnt;	338	{
		339	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		340	return;
		341	}
115		342
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;	343	w_->pending = ++pendingcnt [ABSPRI (w_)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	344	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
121	pendings [pendingcnt - 1].w = w;	345	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
122	pendings [pendingcnt - 1].events = events;	346	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
123	}	347	}
124		348
125	static void	349	static void
		350	queue_events (EV_P_ W *events, int eventcnt, int type)
		351	{
		352	int i;
		353
		354	for (i = 0; i < eventcnt; ++i)
		355	ev_feed_event (EV_A_ events [i], type);
		356	}
		357
		358	inline void
126	fd_event (int fd, int events)	359	fd_event (EV_P_ int fd, int revents)
127	{	360	{
128	ANFD *anfd = anfds + fd;	361	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	362	struct ev_io *w;
130		363
131	for (w = anfd->head; w; w = w->next)	364	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	365	{
133	int ev = w->events & events;	366	int ev = w->events & revents;
134		367
135	if (ev)	368	if (ev)
136	event ((struct ev_watcher *)w, ev);	369	ev_feed_event (EV_A_ (W)w, ev);
		370	}
		371	}
		372
		373	void
		374	ev_feed_fd_event (EV_P_ int fd, int revents)
		375	{
		376	fd_event (EV_A_ fd, revents);
		377	}
		378
		379	/*****************************************************************************/
		380
		381	static void
		382	fd_reify (EV_P)
		383	{
		384	int i;
		385
		386	for (i = 0; i < fdchangecnt; ++i)
		387	{
		388	int fd = fdchanges [i];
		389	ANFD *anfd = anfds + fd;
		390	struct ev_io *w;
		391
		392	int events = 0;
		393
		394	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		395	events |= w->events;
		396
		397	anfd->reify = 0;
		398
		399	method_modify (EV_A_ fd, anfd->events, events);
		400	anfd->events = events;
		401	}
		402
		403	fdchangecnt = 0;
		404	}
		405
		406	static void
		407	fd_change (EV_P_ int fd)
		408	{
		409	if (anfds [fd].reify)
		410	return;
		411
		412	anfds [fd].reify = 1;
		413
		414	++fdchangecnt;
		415	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		416	fdchanges [fdchangecnt - 1] = fd;
		417	}
		418
		419	static void
		420	fd_kill (EV_P_ int fd)
		421	{
		422	struct ev_io *w;
		423
		424	while ((w = (struct ev_io *)anfds [fd].head))
		425	{
		426	ev_io_stop (EV_A_ w);
		427	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		428	}
		429	}
		430
		431	static int
		432	fd_valid (int fd)
		433	{
		434	#ifdef WIN32
		435	return !!win32_get_osfhandle (fd);
		436	#else
		437	return fcntl (fd, F_GETFD) != -1;
		438	#endif
		439	}
		440
		441	/* called on EBADF to verify fds */
		442	static void
		443	fd_ebadf (EV_P)
		444	{
		445	int fd;
		446
		447	for (fd = 0; fd < anfdmax; ++fd)
		448	if (anfds [fd].events)
		449	if (!fd_valid (fd) == -1 && errno == EBADF)
		450	fd_kill (EV_A_ fd);
		451	}
		452
		453	/* called on ENOMEM in select/poll to kill some fds and retry */
		454	static void
		455	fd_enomem (EV_P)
		456	{
		457	int fd;
		458
		459	for (fd = anfdmax; fd--; )
		460	if (anfds [fd].events)
		461	{
		462	fd_kill (EV_A_ fd);
		463	return;
137	}	464	}
138	}	465	}
139		466
140	static struct ev_timer **atimers;	467	/* usually called after fork if method needs to re-arm all fds from scratch */
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void	468	static void
147	upheap (struct ev_timer **timers, int k)	469	fd_rearm_all (EV_P)
148	{	470	{
149	struct ev_timer *w = timers [k];	471	int fd;
150		472
		473	/* this should be highly optimised to not do anything but set a flag */
		474	for (fd = 0; fd < anfdmax; ++fd)
		475	if (anfds [fd].events)
		476	{
		477	anfds [fd].events = 0;
		478	fd_change (EV_A_ fd);
		479	}
		480	}
		481
		482	/*****************************************************************************/
		483
		484	static void
		485	upheap (WT *heap, int k)
		486	{
		487	WT w = heap [k];
		488
151	while (k && timers [k >> 1]->at > w->at)	489	while (k && heap [k >> 1]->at > w->at)
152	{	490	{
153	timers [k] = timers [k >> 1];	491	heap [k] = heap [k >> 1];
154	timers [k]->active = k + 1;	492	((W)heap [k])->active = k + 1;
155	k >>= 1;	493	k >>= 1;
156	}	494	}
157		495
158	timers [k] = w;	496	heap [k] = w;
159	timers [k]->active = k + 1;	497	((W)heap [k])->active = k + 1;
160		498
161	}	499	}
162		500
163	static void	501	static void
164	downheap (struct ev_timer **timers, int N, int k)	502	downheap (WT *heap, int N, int k)
165	{	503	{
166	struct ev_timer *w = timers [k];	504	WT w = heap [k];
167		505
168	while (k < (N >> 1))	506	while (k < (N >> 1))
169	{	507	{
170	int j = k << 1;	508	int j = k << 1;
171		509
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	510	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
173	++j;	511	++j;
174		512
175	if (w->at <= timers [j]->at)	513	if (w->at <= heap [j]->at)
176	break;	514	break;
177		515
178	timers [k] = timers [j];	516	heap [k] = heap [j];
179	timers [k]->active = k + 1;	517	((W)heap [k])->active = k + 1;
180	k = j;	518	k = j;
181	}	519	}
182		520
183	timers [k] = w;	521	heap [k] = w;
184	timers [k]->active = k + 1;	522	((W)heap [k])->active = k + 1;
185	}	523	}
		524
		525	inline void
		526	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		527	{
		528	ev_tstamp old_at = heap [k]->at;
		529	heap [k]->at = at;
		530
		531	if (old_at < at)
		532	downheap (heap, N, k);
		533	else
		534	upheap (heap, k);
		535	}
		536
		537	/*****************************************************************************/
186		538
187	typedef struct	539	typedef struct
188	{	540	{
189	struct ev_signal *head;	541	WL head;
190	sig_atomic_t gotsig;	542	sig_atomic_t volatile gotsig;
191	} ANSIG;	543	} ANSIG;
192		544
193	static ANSIG *signals;	545	static ANSIG *signals;
194	static int signalmax;	546	static int signalmax;
195		547
196	static int sigpipe [2];	548	static int sigpipe [2];
197	static sig_atomic_t gotsig;	549	static sig_atomic_t volatile gotsig;
198	static struct ev_io sigev;	550	static struct ev_io sigev;
199		551
200	static void	552	static void
201	signals_init (ANSIG *base, int count)	553	signals_init (ANSIG *base, int count)
202	{	554	{
203	while (count--)	555	while (count--)
204	{	556	{
205	base->head = 0;	557	base->head = 0;
206	base->gotsig = 0;	558	base->gotsig = 0;
		559
207	++base;	560	++base;
208	}	561	}
209	}	562	}
210		563
211	static void	564	static void
212	sighandler (int signum)	565	sighandler (int signum)
213	{	566	{
		567	#if WIN32
		568	signal (signum, sighandler);
		569	#endif
		570
214	signals [signum - 1].gotsig = 1;	571	signals [signum - 1].gotsig = 1;
215		572
216	if (!gotsig)	573	if (!gotsig)
217	{	574	{
		575	int old_errno = errno;
218	gotsig = 1;	576	gotsig = 1;
		577	#ifdef WIN32
		578	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		579	#else
219	write (sigpipe [1], &gotsig, 1);	580	write (sigpipe [1], &signum, 1);
		581	#endif
		582	errno = old_errno;
220	}	583	}
221	}	584	}
222		585
		586	void
		587	ev_feed_signal_event (EV_P_ int signum)
		588	{
		589	WL w;
		590
		591	#if EV_MULTIPLICITY
		592	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		593	#endif
		594
		595	--signum;
		596
		597	if (signum < 0 || signum >= signalmax)
		598	return;
		599
		600	signals [signum].gotsig = 0;
		601
		602	for (w = signals [signum].head; w; w = w->next)
		603	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		604	}
		605
223	static void	606	static void
224	sigcb (struct ev_io *iow, int revents)	607	sigcb (EV_P_ struct ev_io *iow, int revents)
225	{	608	{
226	struct ev_signal *w;
227	int sig;	609	int signum;
228		610
		611	#ifdef WIN32
		612	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		613	#else
		614	read (sigpipe [0], &revents, 1);
		615	#endif
229	gotsig = 0;	616	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231		617
232	for (sig = signalmax; sig--; )	618	for (signum = signalmax; signum--; )
233	if (signals [sig].gotsig)	619	if (signals [signum].gotsig)
234	{	620	ev_feed_signal_event (EV_A_ signum + 1);
235	signals [sig].gotsig = 0;
236
237	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);
239	}
240	}	621	}
241		622
242	static void	623	static void
243	siginit (void)	624	siginit (EV_P)
244	{	625	{
		626	#ifndef WIN32
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	627	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	628	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247		629
248	/* rather than sort out wether we really need nb, set it */	630	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	631	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	632	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		633	#endif
251		634
252	evio_set (&sigev, sigpipe [0], EV_READ);	635	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	636	ev_io_start (EV_A_ &sigev);
		637	ev_unref (EV_A); /* child watcher should not keep loop alive */
254	}	638	}
255		639
		640	/*****************************************************************************/
		641
		642	static struct ev_child *childs [PID_HASHSIZE];
		643
		644	#ifndef WIN32
		645
		646	static struct ev_signal childev;
		647
		648	#ifndef WCONTINUED
		649	# define WCONTINUED 0
		650	#endif
		651
		652	static void
		653	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		654	{
		655	struct ev_child *w;
		656
		657	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		658	if (w->pid == pid || !w->pid)
		659	{
		660	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		661	w->rpid = pid;
		662	w->rstatus = status;
		663	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		664	}
		665	}
		666
		667	static void
		668	childcb (EV_P_ struct ev_signal *sw, int revents)
		669	{
		670	int pid, status;
		671
		672	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		673	{
		674	/* make sure we are called again until all childs have been reaped */
		675	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		676
		677	child_reap (EV_A_ sw, pid, pid, status);
		678	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		679	}
		680	}
		681
		682	#endif
		683
		684	/*****************************************************************************/
		685
		686	#if EV_USE_KQUEUE
		687	# include "ev_kqueue.c"
		688	#endif
256	#if HAVE_EPOLL	689	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	690	# include "ev_epoll.c"
258	#endif	691	#endif
		692	#if EV_USE_POLL
		693	# include "ev_poll.c"
		694	#endif
259	#if HAVE_SELECT	695	#if EV_USE_SELECT
260	# include "ev_select.c"	696	# include "ev_select.c"
261	#endif	697	#endif
262		698
263	int ev_init (int flags)	699	int
		700	ev_version_major (void)
264	{	701	{
		702	return EV_VERSION_MAJOR;
		703	}
		704
		705	int
		706	ev_version_minor (void)
		707	{
		708	return EV_VERSION_MINOR;
		709	}
		710
		711	/* return true if we are running with elevated privileges and should ignore env variables */
		712	static int
		713	enable_secure (void)
		714	{
		715	#ifdef WIN32
		716	return 0;
		717	#else
		718	return getuid () != geteuid ()
		719	|| getgid () != getegid ();
		720	#endif
		721	}
		722
		723	int
		724	ev_method (EV_P)
		725	{
		726	return method;
		727	}
		728
		729	static void
		730	loop_init (EV_P_ int methods)
		731	{
		732	if (!method)
		733	{
265	#if HAVE_MONOTONIC	734	#if EV_USE_MONOTONIC
266	{	735	{
267	struct timespec ts;	736	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	737	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	738	have_monotonic = 1;
270	}	739	}
271	#endif	740	#endif
272		741
273	ev_now = ev_time ();	742	ev_rt_now = ev_time ();
274	now = get_clock ();	743	mn_now = get_clock ();
275	diff = ev_now - now;	744	now_floor = mn_now;
		745	rtmn_diff = ev_rt_now - mn_now;
276		746
277	if (pipe (sigpipe))	747	if (methods == EVMETHOD_AUTO)
278	return 0;	748	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		749	methods = atoi (getenv ("LIBEV_METHODS"));
		750	else
		751	methods = EVMETHOD_ANY;
279		752
280	ev_method = EVMETHOD_NONE;	753	method = 0;
		754	#if EV_USE_WIN32
		755	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		756	#endif
		757	#if EV_USE_KQUEUE
		758	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		759	#endif
281	#if HAVE_EPOLL	760	#if EV_USE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	761	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
283	#endif	762	#endif
		763	#if EV_USE_POLL
		764	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		765	#endif
284	#if HAVE_SELECT	766	#if EV_USE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);	767	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
286	#endif	768	#endif
287		769
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);	770	ev_init (&sigev, sigcb);
291	siginit ();	771	ev_set_priority (&sigev, EV_MAXPRI);
292	}	772	}
293
294	return ev_method;
295	}	773	}
296		774
297	void ev_prefork (void)	775	void
298	{	776	loop_destroy (EV_P)
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void
320	fd_reify (void)
321	{	777	{
322	int i;	778	int i;
323		779
324	for (i = 0; i < fdchangecnt; ++i)	780	#if EV_USE_WIN32
		781	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		782	#endif
		783	#if EV_USE_KQUEUE
		784	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		785	#endif
		786	#if EV_USE_EPOLL
		787	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		788	#endif
		789	#if EV_USE_POLL
		790	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		791	#endif
		792	#if EV_USE_SELECT
		793	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		794	#endif
		795
		796	for (i = NUMPRI; i--; )
		797	array_free (pending, [i]);
		798
		799	/* have to use the microsoft-never-gets-it-right macro */
		800	array_free_microshit (fdchange);
		801	array_free_microshit (timer);
		802	array_free_microshit (periodic);
		803	array_free_microshit (idle);
		804	array_free_microshit (prepare);
		805	array_free_microshit (check);
		806
		807	method = 0;
		808	}
		809
		810	static void
		811	loop_fork (EV_P)
		812	{
		813	#if EV_USE_EPOLL
		814	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		815	#endif
		816	#if EV_USE_KQUEUE
		817	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		818	#endif
		819
		820	if (ev_is_active (&sigev))
		821	{
		822	/* default loop */
		823
		824	ev_ref (EV_A);
		825	ev_io_stop (EV_A_ &sigev);
		826	close (sigpipe [0]);
		827	close (sigpipe [1]);
		828
		829	while (pipe (sigpipe))
		830	syserr ("(libev) error creating pipe");
		831
		832	siginit (EV_A);
325	{	833	}
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329		834
330	int wev = 0;	835	postfork = 0;
		836	}
331		837
332	for (w = anfd->head; w; w = w->next)	838	#if EV_MULTIPLICITY
333	wev |= w->events;	839	struct ev_loop *
		840	ev_loop_new (int methods)
		841	{
		842	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
334		843
335	if (anfd->wev != wev)	844	memset (loop, 0, sizeof (struct ev_loop));
		845
		846	loop_init (EV_A_ methods);
		847
		848	if (ev_method (EV_A))
		849	return loop;
		850
		851	return 0;
		852	}
		853
		854	void
		855	ev_loop_destroy (EV_P)
		856	{
		857	loop_destroy (EV_A);
		858	ev_free (loop);
		859	}
		860
		861	void
		862	ev_loop_fork (EV_P)
		863	{
		864	postfork = 1;
		865	}
		866
		867	#endif
		868
		869	#if EV_MULTIPLICITY
		870	struct ev_loop *
		871	#else
		872	int
		873	#endif
		874	ev_default_loop (int methods)
		875	{
		876	if (sigpipe [0] == sigpipe [1])
		877	if (pipe (sigpipe))
		878	return 0;
		879
		880	if (!default_loop)
		881	{
		882	#if EV_MULTIPLICITY
		883	struct ev_loop *loop = default_loop = &default_loop_struct;
		884	#else
		885	default_loop = 1;
		886	#endif
		887
		888	loop_init (EV_A_ methods);
		889
		890	if (ev_method (EV_A))
336	{	891	{
337	method_modify (fd, anfd->wev, wev);	892	siginit (EV_A);
338	anfd->wev = wev;	893
		894	#ifndef WIN32
		895	ev_signal_init (&childev, childcb, SIGCHLD);
		896	ev_set_priority (&childev, EV_MAXPRI);
		897	ev_signal_start (EV_A_ &childev);
		898	ev_unref (EV_A); /* child watcher should not keep loop alive */
		899	#endif
339	}	900	}
		901	else
		902	default_loop = 0;
340	}	903	}
341		904
342	fdchangecnt = 0;	905	return default_loop;
343	}	906	}
344		907
		908	void
		909	ev_default_destroy (void)
		910	{
		911	#if EV_MULTIPLICITY
		912	struct ev_loop *loop = default_loop;
		913	#endif
		914
		915	#ifndef WIN32
		916	ev_ref (EV_A); /* child watcher */
		917	ev_signal_stop (EV_A_ &childev);
		918	#endif
		919
		920	ev_ref (EV_A); /* signal watcher */
		921	ev_io_stop (EV_A_ &sigev);
		922
		923	close (sigpipe [0]); sigpipe [0] = 0;
		924	close (sigpipe [1]); sigpipe [1] = 0;
		925
		926	loop_destroy (EV_A);
		927	}
		928
		929	void
		930	ev_default_fork (void)
		931	{
		932	#if EV_MULTIPLICITY
		933	struct ev_loop *loop = default_loop;
		934	#endif
		935
		936	if (method)
		937	postfork = 1;
		938	}
		939
		940	/*****************************************************************************/
		941
345	static void	942	static int
346	call_pending ()	943	any_pending (EV_P)
347	{	944	{
348	int i;	945	int pri;
349		946
350	for (i = 0; i < pendingcnt; ++i)	947	for (pri = NUMPRI; pri--; )
		948	if (pendingcnt [pri])
		949	return 1;
		950
		951	return 0;
		952	}
		953
		954	static void
		955	call_pending (EV_P)
		956	{
		957	int pri;
		958
		959	for (pri = NUMPRI; pri--; )
		960	while (pendingcnt [pri])
351	{	961	{
352	ANPENDING *p = pendings + i;	962	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
353		963
354	if (p->w)	964	if (p->w)
355	{	965	{
356	p->w->pending = 0;	966	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	967	EV_CB_INVOKE (p->w, p->events);
358	}	968	}
359	}	969	}
360
361	pendingcnt = 0;
362	}	970	}
363		971
364	static void	972	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	973	timers_reify (EV_P)
366	{	974	{
367	while (timercnt && timers [0]->at <= now)	975	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	976	{
369	struct ev_timer *w = timers [0];	977	struct ev_timer *w = timers [0];
		978
		979	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		980
371	/* first reschedule or stop timer */	981	/* first reschedule or stop timer */
372	if (w->repeat)	982	if (w->repeat)
373	{	983	{
374	if (w->is_abs)	984	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
376	else
377	w->at = now + w->repeat;	985	((WT)w)->at = mn_now + w->repeat;
378
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	986	downheap ((WT *)timers, timercnt, 0);
382	}	987	}
383	else	988	else
		989	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		990
		991	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		992	}
		993	}
		994
		995	static void
		996	periodics_reify (EV_P)
		997	{
		998	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		999	{
		1000	struct ev_periodic *w = periodics [0];
		1001
		1002	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1003
		1004	/* first reschedule or stop timer */
		1005	if (w->reschedule_cb)
384	{	1006	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	1007	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
386	--timercnt; /* maybe pass by reference instead? */	1008
		1009	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1010	downheap ((WT *)periodics, periodiccnt, 0);
387	}	1011	}
		1012	else if (w->interval)
		1013	{
		1014	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1015	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1016	downheap ((WT *)periodics, periodiccnt, 0);
		1017	}
		1018	else
		1019	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1020
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1021	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1022	}
391	}	1023	}
392		1024
393	static void	1025	static void
394	time_update ()	1026	periodics_reschedule (EV_P)
395	{	1027	{
396	int i;	1028	int i;
		1029
		1030	/* adjust periodics after time jump */
		1031	for (i = 0; i < periodiccnt; ++i)
		1032	{
		1033	struct ev_periodic *w = periodics [i];
		1034
		1035	if (w->reschedule_cb)
		1036	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1037	else if (w->interval)
		1038	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1039	}
		1040
		1041	/* now rebuild the heap */
		1042	for (i = periodiccnt >> 1; i--; )
		1043	downheap ((WT *)periodics, periodiccnt, i);
		1044	}
		1045
		1046	inline int
		1047	time_update_monotonic (EV_P)
		1048	{
		1049	mn_now = get_clock ();
		1050
		1051	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1052	{
		1053	ev_rt_now = rtmn_diff + mn_now;
		1054	return 0;
		1055	}
		1056	else
		1057	{
		1058	now_floor = mn_now;
397	ev_now = ev_time ();	1059	ev_rt_now = ev_time ();
398		1060	return 1;
399	if (have_monotonic)
400	{	1061	}
401	ev_tstamp odiff = diff;	1062	}
402		1063
403	/* detecting time jumps is much more difficult */	1064	static void
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1065	time_update (EV_P)
		1066	{
		1067	int i;
		1068
		1069	#if EV_USE_MONOTONIC
		1070	if (expect_true (have_monotonic))
		1071	{
		1072	if (time_update_monotonic (EV_A))
405	{	1073	{
406	now = get_clock ();	1074	ev_tstamp odiff = rtmn_diff;
		1075
		1076	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1077	{
407	diff = ev_now - now;	1078	rtmn_diff = ev_rt_now - mn_now;
408		1079
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1080	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1081	return; /* all is well */
411		1082
412	ev_now = ev_time ();	1083	ev_rt_now = ev_time ();
		1084	mn_now = get_clock ();
		1085	now_floor = mn_now;
		1086	}
		1087
		1088	periodics_reschedule (EV_A);
		1089	/* no timer adjustment, as the monotonic clock doesn't jump */
		1090	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
413	}	1091	}
		1092	}
		1093	else
		1094	#endif
		1095	{
		1096	ev_rt_now = ev_time ();
414		1097
415	/* time jump detected, reschedule atimers */	1098	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
416	for (i = 0; i < atimercnt; ++i)
417	{	1099	{
418	struct ev_timer *w = atimers [i];	1100	periodics_reschedule (EV_A);
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1101
		1102	/* adjust timers. this is easy, as the offset is the same for all */
		1103	for (i = 0; i < timercnt; ++i)
		1104	((WT)timers [i])->at += ev_rt_now - mn_now;
420	}	1105	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1106
429	now = ev_now;	1107	mn_now = ev_rt_now;
430	}	1108	}
431	}	1109	}
432		1110
433	int ev_loop_done;	1111	void
		1112	ev_ref (EV_P)
		1113	{
		1114	++activecnt;
		1115	}
434		1116
		1117	void
		1118	ev_unref (EV_P)
		1119	{
		1120	--activecnt;
		1121	}
		1122
		1123	static int loop_done;
		1124
		1125	void
435	void ev_loop (int flags)	1126	ev_loop (EV_P_ int flags)
436	{	1127	{
437	double block;	1128	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1129	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		1130
440	do	1131	do
441	{	1132	{
		1133	/* queue check watchers (and execute them) */
		1134	if (expect_false (preparecnt))
		1135	{
		1136	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1137	call_pending (EV_A);
		1138	}
		1139
		1140	/* we might have forked, so reify kernel state if necessary */
		1141	if (expect_false (postfork))
		1142	loop_fork (EV_A);
		1143
442	/* update fd-related kernel structures */	1144	/* update fd-related kernel structures */
443	fd_reify ();	1145	fd_reify (EV_A);
444		1146
445	/* calculate blocking time */	1147	/* calculate blocking time */
		1148
		1149	/* we only need this for !monotonic clock or timers, but as we basically
		1150	always have timers, we just calculate it always */
		1151	#if EV_USE_MONOTONIC
		1152	if (expect_true (have_monotonic))
		1153	time_update_monotonic (EV_A);
		1154	else
		1155	#endif
		1156	{
		1157	ev_rt_now = ev_time ();
		1158	mn_now = ev_rt_now;
		1159	}
		1160
446	if (flags & EVLOOP_NONBLOCK)	1161	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1162	block = 0.;
448	else	1163	else
449	{	1164	{
450	block = MAX_BLOCKTIME;	1165	block = MAX_BLOCKTIME;
451		1166
452	if (rtimercnt)	1167	if (timercnt)
453	{	1168	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1169	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
455	if (block > to) block = to;	1170	if (block > to) block = to;
456	}	1171	}
457		1172
458	if (atimercnt)	1173	if (periodiccnt)
459	{	1174	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1175	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
461	if (block > to) block = to;	1176	if (block > to) block = to;
462	}	1177	}
463		1178
464	if (block < 0.) block = 0.;	1179	if (block < 0.) block = 0.;
465	}	1180	}
466		1181
467	method_poll (block);	1182	method_poll (EV_A_ block);
468		1183
469	/* update ev_now, do magic */	1184	/* update ev_rt_now, do magic */
470	time_update ();	1185	time_update (EV_A);
471		1186
472	/* put pending timers into pendign queue and reschedule them */	1187	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1188	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1189	periodics_reify (EV_A); /* absolute timers called first */
475	/* relative timers second */
476	timers_reify (rtimers, rtimercnt, now);
477		1190
		1191	/* queue idle watchers unless io or timers are pending */
		1192	if (idlecnt && !any_pending (EV_A))
		1193	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1194
		1195	/* queue check watchers, to be executed first */
		1196	if (checkcnt)
		1197	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1198
478	call_pending ();	1199	call_pending (EV_A);
479	}	1200	}
480	while (!ev_loop_done);	1201	while (activecnt && !loop_done);
481	}
482		1202
483	static void	1203	if (loop_done != 2)
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1204	loop_done = 0;
		1205	}
		1206
		1207	void
		1208	ev_unloop (EV_P_ int how)
		1209	{
		1210	loop_done = how;
		1211	}
		1212
		1213	/*****************************************************************************/
		1214
		1215	inline void
		1216	wlist_add (WL *head, WL elem)
485	{	1217	{
486	elem->next = *head;	1218	elem->next = *head;
487	*head = elem;	1219	*head = elem;
488	}	1220	}
489		1221
490	static void	1222	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1223	wlist_del (WL *head, WL elem)
492	{	1224	{
493	while (*head)	1225	while (*head)
494	{	1226	{
495	if (*head == elem)	1227	if (*head == elem)
496	{	1228	{
…		…
500		1232
501	head = &(*head)->next;	1233	head = &(*head)->next;
502	}	1234	}
503	}	1235	}
504		1236
505	static void	1237	inline void
506	ev_start (struct ev_watcher *w, int active)	1238	ev_clear_pending (EV_P_ W w)
507	{	1239	{
		1240	if (w->pending)
		1241	{
		1242	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1243	w->pending = 0;
		1244	}
		1245	}
		1246
		1247	inline void
		1248	ev_start (EV_P_ W w, int active)
		1249	{
		1250	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1251	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1252
509	w->active = active;	1253	w->active = active;
		1254	ev_ref (EV_A);
510	}	1255	}
511		1256
512	static void	1257	inline void
513	ev_stop (struct ev_watcher *w)	1258	ev_stop (EV_P_ W w)
514	{	1259	{
515	if (w->pending)	1260	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1261	w->active = 0;
519	/* nop */
520	}	1262	}
521		1263
		1264	/*****************************************************************************/
		1265
522	void	1266	void
523	evio_start (struct ev_io *w)	1267	ev_io_start (EV_P_ struct ev_io *w)
524	{	1268	{
		1269	int fd = w->fd;
		1270
525	if (ev_is_active (w))	1271	if (ev_is_active (w))
526	return;	1272	return;
527		1273
528	int fd = w->fd;	1274	assert (("ev_io_start called with negative fd", fd >= 0));
529		1275
530	ev_start ((struct ev_watcher *)w, 1);	1276	ev_start (EV_A_ (W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1277	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1278	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		1279
534	++fdchangecnt;	1280	fd_change (EV_A_ fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	1281	}
538		1282
539	void	1283	void
540	evio_stop (struct ev_io *w)	1284	ev_io_stop (EV_P_ struct ev_io *w)
541	{	1285	{
		1286	ev_clear_pending (EV_A_ (W)w);
542	if (!ev_is_active (w))	1287	if (!ev_is_active (w))
543	return;	1288	return;
544		1289
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1290	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
546	ev_stop ((struct ev_watcher *)w);	1291	ev_stop (EV_A_ (W)w);
547		1292
548	++fdchangecnt;	1293	fd_change (EV_A_ w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	1294	}
552		1295
553	void	1296	void
554	evtimer_start (struct ev_timer *w)	1297	ev_timer_start (EV_P_ struct ev_timer *w)
555	{	1298	{
556	if (ev_is_active (w))	1299	if (ev_is_active (w))
557	return;	1300	return;
558		1301
559	if (w->is_abs)	1302	((WT)w)->at += mn_now;
		1303
		1304	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1305
		1306	ev_start (EV_A_ (W)w, ++timercnt);
		1307	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1308	timers [timercnt - 1] = w;
		1309	upheap ((WT *)timers, timercnt - 1);
		1310
		1311	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1312	}
		1313
		1314	void
		1315	ev_timer_stop (EV_P_ struct ev_timer *w)
		1316	{
		1317	ev_clear_pending (EV_A_ (W)w);
		1318	if (!ev_is_active (w))
		1319	return;
		1320
		1321	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1322
		1323	if (((W)w)->active < timercnt--)
		1324	{
		1325	timers [((W)w)->active - 1] = timers [timercnt];
		1326	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
560	{	1327	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	1328
		1329	((WT)w)->at = w->repeat;
		1330
		1331	ev_stop (EV_A_ (W)w);
		1332	}
		1333
		1334	void
		1335	ev_timer_again (EV_P_ struct ev_timer *w)
		1336	{
		1337	if (ev_is_active (w))
		1338	{
562	if (w->repeat)	1339	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1340	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
564
565	ev_start ((struct ev_watcher *)w, ++atimercnt);
566	array_needsize (atimers, atimermax, atimercnt, );
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else	1341	else
		1342	ev_timer_stop (EV_A_ w);
571	{	1343	}
572	w->at += now;	1344	else if (w->repeat)
		1345	ev_timer_start (EV_A_ w);
		1346	}
573		1347
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1348	void
575	array_needsize (rtimers, rtimermax, rtimercnt, );	1349	ev_periodic_start (EV_P_ struct ev_periodic *w)
576	rtimers [rtimercnt - 1] = w;	1350	{
577	upheap (rtimers, rtimercnt - 1);	1351	if (ev_is_active (w))
		1352	return;
		1353
		1354	if (w->reschedule_cb)
		1355	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1356	else if (w->interval)
578	}	1357	{
		1358	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1359	/* this formula differs from the one in periodic_reify because we do not always round up */
		1360	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1361	}
579		1362
580	}	1363	ev_start (EV_A_ (W)w, ++periodiccnt);
		1364	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1365	periodics [periodiccnt - 1] = w;
		1366	upheap ((WT *)periodics, periodiccnt - 1);
581		1367
		1368	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1369	}
		1370
582	void	1371	void
583	evtimer_stop (struct ev_timer *w)	1372	ev_periodic_stop (EV_P_ struct ev_periodic *w)
584	{	1373	{
		1374	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1375	if (!ev_is_active (w))
586	return;	1376	return;
587		1377
588	if (w->is_abs)	1378	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
589	{	1379
590	if (w->active < atimercnt--)	1380	if (((W)w)->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	1381	{
596	else	1382	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1383	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
597	{	1384	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1385
605	ev_stop ((struct ev_watcher *)w);	1386	ev_stop (EV_A_ (W)w);
606	}	1387	}
607		1388
608	void	1389	void
609	evsignal_start (struct ev_signal *w)	1390	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1391	{
		1392	/* TODO: use adjustheap and recalculation */
		1393	ev_periodic_stop (EV_A_ w);
		1394	ev_periodic_start (EV_A_ w);
		1395	}
		1396
		1397	void
		1398	ev_idle_start (EV_P_ struct ev_idle *w)
610	{	1399	{
611	if (ev_is_active (w))	1400	if (ev_is_active (w))
612	return;	1401	return;
613		1402
614	ev_start ((struct ev_watcher *)w, 1);	1403	ev_start (EV_A_ (W)w, ++idlecnt);
		1404	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1405	idles [idlecnt - 1] = w;
		1406	}
		1407
		1408	void
		1409	ev_idle_stop (EV_P_ struct ev_idle *w)
		1410	{
		1411	ev_clear_pending (EV_A_ (W)w);
		1412	if (ev_is_active (w))
		1413	return;
		1414
		1415	idles [((W)w)->active - 1] = idles [--idlecnt];
		1416	ev_stop (EV_A_ (W)w);
		1417	}
		1418
		1419	void
		1420	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1421	{
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	ev_start (EV_A_ (W)w, ++preparecnt);
		1426	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1427	prepares [preparecnt - 1] = w;
		1428	}
		1429
		1430	void
		1431	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1432	{
		1433	ev_clear_pending (EV_A_ (W)w);
		1434	if (ev_is_active (w))
		1435	return;
		1436
		1437	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1438	ev_stop (EV_A_ (W)w);
		1439	}
		1440
		1441	void
		1442	ev_check_start (EV_P_ struct ev_check *w)
		1443	{
		1444	if (ev_is_active (w))
		1445	return;
		1446
		1447	ev_start (EV_A_ (W)w, ++checkcnt);
		1448	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1449	checks [checkcnt - 1] = w;
		1450	}
		1451
		1452	void
		1453	ev_check_stop (EV_P_ struct ev_check *w)
		1454	{
		1455	ev_clear_pending (EV_A_ (W)w);
		1456	if (ev_is_active (w))
		1457	return;
		1458
		1459	checks [((W)w)->active - 1] = checks [--checkcnt];
		1460	ev_stop (EV_A_ (W)w);
		1461	}
		1462
		1463	#ifndef SA_RESTART
		1464	# define SA_RESTART 0
		1465	#endif
		1466
		1467	void
		1468	ev_signal_start (EV_P_ struct ev_signal *w)
		1469	{
		1470	#if EV_MULTIPLICITY
		1471	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1472	#endif
		1473	if (ev_is_active (w))
		1474	return;
		1475
		1476	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1477
		1478	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1479	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1480	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1481
618	if (!w->next)	1482	if (!((WL)w)->next)
619	{	1483	{
		1484	#if WIN32
		1485	signal (w->signum, sighandler);
		1486	#else
620	struct sigaction sa;	1487	struct sigaction sa;
621	sa.sa_handler = sighandler;	1488	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1489	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1490	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1491	sigaction (w->signum, &sa, 0);
		1492	#endif
625	}	1493	}
626	}	1494	}
627		1495
628	void	1496	void
629	evsignal_stop (struct ev_signal *w)	1497	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1498	{
		1499	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1500	if (!ev_is_active (w))
632	return;	1501	return;
633		1502
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1503	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1504	ev_stop (EV_A_ (W)w);
636		1505
637	if (!signals [w->signum - 1].head)	1506	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1507	signal (w->signum, SIG_DFL);
639	}	1508	}
640		1509
		1510	void
		1511	ev_child_start (EV_P_ struct ev_child *w)
		1512	{
		1513	#if EV_MULTIPLICITY
		1514	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1515	#endif
		1516	if (ev_is_active (w))
		1517	return;
		1518
		1519	ev_start (EV_A_ (W)w, 1);
		1520	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1521	}
		1522
		1523	void
		1524	ev_child_stop (EV_P_ struct ev_child *w)
		1525	{
		1526	ev_clear_pending (EV_A_ (W)w);
		1527	if (ev_is_active (w))
		1528	return;
		1529
		1530	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1531	ev_stop (EV_A_ (W)w);
		1532	}
		1533
641	/*****************************************************************************/	1534	/*****************************************************************************/
642	#if 1
643		1535
644	static void	1536	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1537	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648	}
649
650	static void
651	ocb (struct ev_timer *w, int revents)
652	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}
657
658	static void
659	scb (struct ev_signal *w, int revents)
660	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662	}
663
664	int main (void)
665	{
666	struct ev_io sin;	1538	struct ev_io io;
667
668	ev_init (0);
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}
687	#endif
688
689	struct ev_timer t1;	1539	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1540	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1541	void *arg;
692	evtimer_start (&t1);	1542	};
693		1543
694	struct ev_signal sig;	1544	static void
695	evw_init (&sig, scb, 65535);	1545	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1546	{
697	evsignal_start (&sig);	1547	void (*cb)(int revents, void *arg) = once->cb;
		1548	void *arg = once->arg;
698		1549
699	ev_loop (0);	1550	ev_io_stop (EV_A_ &once->io);
		1551	ev_timer_stop (EV_A_ &once->to);
		1552	ev_free (once);
700		1553
701	return 0;	1554	cb (revents, arg);
702	}	1555	}
703		1556
704	#endif	1557	static void
		1558	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1559	{
		1560	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1561	}
705		1562
		1563	static void
		1564	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1565	{
		1566	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1567	}
706		1568
		1569	void
		1570	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1571	{
		1572	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
707		1573
		1574	if (!once)
		1575	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1576	else
		1577	{
		1578	once->cb = cb;
		1579	once->arg = arg;
708		1580
		1581	ev_init (&once->io, once_cb_io);
		1582	if (fd >= 0)
		1583	{
		1584	ev_io_set (&once->io, fd, events);
		1585	ev_io_start (EV_A_ &once->io);
		1586	}
		1587
		1588	ev_init (&once->to, once_cb_to);
		1589	if (timeout >= 0.)
		1590	{
		1591	ev_timer_set (&once->to, timeout, 0.);
		1592	ev_timer_start (EV_A_ &once->to);
		1593	}
		1594	}
		1595	}
		1596

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