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Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.69 by root, Tue Nov 6 00:10:04 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>	59	#include <unistd.h>
4	#include <fcntl.h>	60	#include <fcntl.h>
5	#include <signal.h>	61	#include <signal.h>
		62	#include <stddef.h>
6		63
7	#include <stdio.h>	64	#include <stdio.h>
8		65
9	#include <assert.h>	66	#include <assert.h>
10	#include <errno.h>	67	#include <errno.h>
		68	#include <sys/types.h>
		69	#ifndef WIN32
		70	# include <sys/wait.h>
		71	#endif
11	#include <sys/time.h>	72	#include <sys/time.h>
12	#include <time.h>	73	#include <time.h>
13		74
		75	/**/
		76
14	#ifndef HAVE_MONOTONIC	77	#ifndef EV_USE_MONOTONIC
15	# ifdef CLOCK_MONOTONIC
16	# define HAVE_MONOTONIC 1	78	# define EV_USE_MONOTONIC 1
		79	#endif
		80
		81	#ifndef EV_USE_SELECT
		82	# define EV_USE_SELECT 1
		83	#endif
		84
		85	#ifndef EV_USE_POLL
		86	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		87	#endif
		88
		89	#ifndef EV_USE_EPOLL
		90	# define EV_USE_EPOLL 0
		91	#endif
		92
		93	#ifndef EV_USE_KQUEUE
		94	# define EV_USE_KQUEUE 0
		95	#endif
		96
		97	#ifndef EV_USE_WIN32
		98	# ifdef WIN32
		99	# define EV_USE_WIN32 1
		100	# else
		101	# define EV_USE_WIN32 0
17	# endif	102	# endif
18	#endif	103	#endif
19		104
20	#ifndef HAVE_SELECT
21	# define HAVE_SELECT 1
22	#endif
23
24	#ifndef HAVE_EPOLL
25	# define HAVE_EPOLL 0
26	#endif
27
28	#ifndef HAVE_REALTIME	105	#ifndef EV_USE_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	106	# define EV_USE_REALTIME 1
30	#endif	107	#endif
		108
		109	/**/
		110
		111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
		113	# define EV_USE_MONOTONIC 0
		114	#endif
		115
		116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
		118	# define EV_USE_REALTIME 0
		119	#endif
		120
		121	/**/
31		122
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	123	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	124	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		125	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		126	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
34		127
35	#include "ev.h"	128	#include "ev.h"
36		129
37	struct ev_watcher {	130	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	131	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
40		137
41	struct ev_watcher_list {	138	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	139	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		143
45	typedef struct ev_watcher *W;	144	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
47		147
48	static ev_tstamp now, diff; /* monotonic clock */	148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
49	ev_tstamp ev_now;
50	int ev_method;
51		149
52	static int have_monotonic; /* runtime */	150	#if WIN32
53		151	/* note: the comment below could not be substantiated, but what would I care */
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	152	/* MSDN says this is required to handle SIGFPE */
55	static void (*method_modify)(int fd, int oev, int nev);	153	volatile double SIGFPE_REQ = 0.0f;
56	static void (*method_poll)(ev_tstamp timeout);	154	#endif
57		155
58	/*****************************************************************************/	156	/*****************************************************************************/
59		157
60	ev_tstamp	158	static void (*syserr_cb)(void);
		159
		160	void ev_set_syserr_cb (void (*cb)(void))
		161	{
		162	syserr_cb = cb;
		163	}
		164
		165	static void
		166	syserr (void)
		167	{
		168	if (syserr_cb)
		169	syserr_cb ();
		170	else
		171	{
		172	perror ("libev");
		173	abort ();
		174	}
		175	}
		176
		177	static void *(*alloc)(void *ptr, long size);
		178
		179	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		180	{
		181	alloc = cb;
		182	}
		183
		184	static void *
		185	ev_realloc (void *ptr, long size)
		186	{
		187	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		188
		189	if (!ptr && size)
		190	{
		191	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		192	abort ();
		193	}
		194
		195	return ptr;
		196	}
		197
		198	#define ev_malloc(size) ev_realloc (0, (size))
		199	#define ev_free(ptr) ev_realloc ((ptr), 0)
		200
		201	/*****************************************************************************/
		202
		203	typedef struct
		204	{
		205	WL head;
		206	unsigned char events;
		207	unsigned char reify;
		208	} ANFD;
		209
		210	typedef struct
		211	{
		212	W w;
		213	int events;
		214	} ANPENDING;
		215
		216	#if EV_MULTIPLICITY
		217
		218	struct ev_loop
		219	{
		220	# define VAR(name,decl) decl;
		221	# include "ev_vars.h"
		222	};
		223	# undef VAR
		224	# include "ev_wrap.h"
		225
		226	#else
		227
		228	# define VAR(name,decl) static decl;
		229	# include "ev_vars.h"
		230	# undef VAR
		231
		232	#endif
		233
		234	/*****************************************************************************/
		235
		236	inline ev_tstamp
61	ev_time (void)	237	ev_time (void)
62	{	238	{
63	#if HAVE_REALTIME	239	#if EV_USE_REALTIME
64	struct timespec ts;	240	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	241	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	242	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	243	#else
68	struct timeval tv;	244	struct timeval tv;
69	gettimeofday (&tv, 0);	245	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	246	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	247	#endif
72	}	248	}
73		249
74	static ev_tstamp	250	inline ev_tstamp
75	get_clock (void)	251	get_clock (void)
76	{	252	{
77	#if HAVE_MONOTONIC	253	#if EV_USE_MONOTONIC
78	if (have_monotonic)	254	if (expect_true (have_monotonic))
79	{	255	{
80	struct timespec ts;	256	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	257	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	258	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	259	}
84	#endif	260	#endif
85		261
86	return ev_time ();	262	return ev_time ();
87	}	263	}
88		264
		265	ev_tstamp
		266	ev_now (EV_P)
		267	{
		268	return rt_now;
		269	}
		270
		271	#define array_roundsize(base,n) ((n) | 4 & ~3)
		272
89	#define array_needsize(base,cur,cnt,init) \	273	#define array_needsize(base,cur,cnt,init) \
90	if ((cnt) > cur) \	274	if (expect_false ((cnt) > cur)) \
91	{ \	275	{ \
92	int newcnt = cur ? cur << 1 : 16; \	276	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	277	do \
		278	{ \
		279	newcnt = array_roundsize (base, newcnt << 1); \
		280	} \
		281	while ((cnt) > newcnt); \
		282	\
94	base = realloc (base, sizeof (*base) * (newcnt)); \	283	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
95	init (base + cur, newcnt - cur); \	284	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	285	cur = newcnt; \
97	}	286	}
		287
		288	#define array_slim(stem) \
		289	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		290	{ \
		291	stem ## max = array_roundsize (stem ## cnt >> 1); \
		292	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		293	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		294	}
		295
		296	#define array_free(stem, idx) \
		297	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		298
99	/*****************************************************************************/	299	/*****************************************************************************/
100		300
101	typedef struct
102	{
103	struct ev_io *head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	301	static void
114	anfds_init (ANFD *base, int count)	302	anfds_init (ANFD *base, int count)
115	{	303	{
116	while (count--)	304	while (count--)
117	{	305	{
118	base->head = 0;	306	base->head = 0;
119	base->wev = base->rev = EV_NONE;	307	base->events = EV_NONE;
		308	base->reify = 0;
		309
120	++base;	310	++base;
121	}	311	}
122	}	312	}
123		313
124	typedef struct
125	{
126	W w;
127	int events;
128	} ANPENDING;
129
130	static ANPENDING *pendings;
131	static int pendingmax, pendingcnt;
132
133	static void	314	static void
134	event (W w, int events)	315	event (EV_P_ W w, int events)
135	{	316	{
		317	if (w->pending)
		318	{
		319	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		320	return;
		321	}
		322
136	w->pending = ++pendingcnt;	323	w->pending = ++pendingcnt [ABSPRI (w)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	324	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
138	pendings [pendingcnt - 1].w = w;	325	pendings [ABSPRI (w)][w->pending - 1].w = w;
139	pendings [pendingcnt - 1].events = events;	326	pendings [ABSPRI (w)][w->pending - 1].events = events;
140	}	327	}
141		328
142	static void	329	static void
		330	queue_events (EV_P_ W *events, int eventcnt, int type)
		331	{
		332	int i;
		333
		334	for (i = 0; i < eventcnt; ++i)
		335	event (EV_A_ events [i], type);
		336	}
		337
		338	static void
143	fd_event (int fd, int events)	339	fd_event (EV_P_ int fd, int events)
144	{	340	{
145	ANFD *anfd = anfds + fd;	341	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	342	struct ev_io *w;
147		343
148	for (w = anfd->head; w; w = w->next)	344	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
149	{	345	{
150	int ev = w->events & events;	346	int ev = w->events & events;
151		347
152	if (ev)	348	if (ev)
153	event ((W)w, ev);	349	event (EV_A_ (W)w, ev);
154	}	350	}
155	}	351	}
156		352
		353	/*****************************************************************************/
		354
157	static void	355	static void
158	queue_events (W *events, int eventcnt, int type)	356	fd_reify (EV_P)
159	{	357	{
160	int i;	358	int i;
161		359
162	for (i = 0; i < eventcnt; ++i)	360	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	361	{
		362	int fd = fdchanges [i];
		363	ANFD *anfd = anfds + fd;
		364	struct ev_io *w;
		365
		366	int events = 0;
		367
		368	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		369	events |= w->events;
		370
		371	anfd->reify = 0;
		372
		373	method_modify (EV_A_ fd, anfd->events, events);
		374	anfd->events = events;
		375	}
		376
		377	fdchangecnt = 0;
		378	}
		379
		380	static void
		381	fd_change (EV_P_ int fd)
		382	{
		383	if (anfds [fd].reify || fdchangecnt < 0)
		384	return;
		385
		386	anfds [fd].reify = 1;
		387
		388	++fdchangecnt;
		389	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		390	fdchanges [fdchangecnt - 1] = fd;
		391	}
		392
		393	static void
		394	fd_kill (EV_P_ int fd)
		395	{
		396	struct ev_io *w;
		397
		398	while ((w = (struct ev_io *)anfds [fd].head))
		399	{
		400	ev_io_stop (EV_A_ w);
		401	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		402	}
		403	}
		404
		405	/* called on EBADF to verify fds */
		406	static void
		407	fd_ebadf (EV_P)
		408	{
		409	int fd;
		410
		411	for (fd = 0; fd < anfdmax; ++fd)
		412	if (anfds [fd].events)
		413	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		414	fd_kill (EV_A_ fd);
		415	}
		416
		417	/* called on ENOMEM in select/poll to kill some fds and retry */
		418	static void
		419	fd_enomem (EV_P)
		420	{
		421	int fd;
		422
		423	for (fd = anfdmax; fd--; )
		424	if (anfds [fd].events)
		425	{
		426	fd_kill (EV_A_ fd);
		427	return;
		428	}
		429	}
		430
		431	/* susually called after fork if method needs to re-arm all fds from scratch */
		432	static void
		433	fd_rearm_all (EV_P)
		434	{
		435	int fd;
		436
		437	/* this should be highly optimised to not do anything but set a flag */
		438	for (fd = 0; fd < anfdmax; ++fd)
		439	if (anfds [fd].events)
		440	{
		441	anfds [fd].events = 0;
		442	fd_change (EV_A_ fd);
		443	}
164	}	444	}
165		445
166	/*****************************************************************************/	446	/*****************************************************************************/
167		447
168	static struct ev_timer **atimers;
169	static int atimermax, atimercnt;
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void	448	static void
175	upheap (struct ev_timer **timers, int k)	449	upheap (WT *heap, int k)
176	{	450	{
177	struct ev_timer *w = timers [k];	451	WT w = heap [k];
178		452
179	while (k && timers [k >> 1]->at > w->at)	453	while (k && heap [k >> 1]->at > w->at)
180	{	454	{
181	timers [k] = timers [k >> 1];	455	heap [k] = heap [k >> 1];
182	timers [k]->active = k + 1;	456	((W)heap [k])->active = k + 1;
183	k >>= 1;	457	k >>= 1;
184	}	458	}
185		459
186	timers [k] = w;	460	heap [k] = w;
187	timers [k]->active = k + 1;	461	((W)heap [k])->active = k + 1;
188		462
189	}	463	}
190		464
191	static void	465	static void
192	downheap (struct ev_timer **timers, int N, int k)	466	downheap (WT *heap, int N, int k)
193	{	467	{
194	struct ev_timer *w = timers [k];	468	WT w = heap [k];
195		469
196	while (k < (N >> 1))	470	while (k < (N >> 1))
197	{	471	{
198	int j = k << 1;	472	int j = k << 1;
199		473
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	474	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
201	++j;	475	++j;
202		476
203	if (w->at <= timers [j]->at)	477	if (w->at <= heap [j]->at)
204	break;	478	break;
205		479
206	timers [k] = timers [j];	480	heap [k] = heap [j];
207	timers [k]->active = k + 1;	481	((W)heap [k])->active = k + 1;
208	k = j;	482	k = j;
209	}	483	}
210		484
211	timers [k] = w;	485	heap [k] = w;
212	timers [k]->active = k + 1;	486	((W)heap [k])->active = k + 1;
213	}	487	}
214		488
215	/*****************************************************************************/	489	/*****************************************************************************/
216		490
217	typedef struct	491	typedef struct
218	{	492	{
219	struct ev_signal *head;	493	WL head;
220	sig_atomic_t gotsig;	494	sig_atomic_t volatile gotsig;
221	} ANSIG;	495	} ANSIG;
222		496
223	static ANSIG *signals;	497	static ANSIG *signals;
224	static int signalmax;	498	static int signalmax;
225		499
226	static int sigpipe [2];	500	static int sigpipe [2];
227	static sig_atomic_t gotsig;	501	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	502	static struct ev_io sigev;
229		503
230	static void	504	static void
231	signals_init (ANSIG *base, int count)	505	signals_init (ANSIG *base, int count)
232	{	506	{
233	while (count--)	507	while (count--)
234	{	508	{
235	base->head = 0;	509	base->head = 0;
236	base->gotsig = 0;	510	base->gotsig = 0;
		511
237	++base;	512	++base;
238	}	513	}
239	}	514	}
240		515
241	static void	516	static void
242	sighandler (int signum)	517	sighandler (int signum)
243	{	518	{
		519	#if WIN32
		520	signal (signum, sighandler);
		521	#endif
		522
244	signals [signum - 1].gotsig = 1;	523	signals [signum - 1].gotsig = 1;
245		524
246	if (!gotsig)	525	if (!gotsig)
247	{	526	{
		527	int old_errno = errno;
248	gotsig = 1;	528	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);	529	write (sigpipe [1], &signum, 1);
		530	errno = old_errno;
250	}	531	}
251	}	532	}
252		533
253	static void	534	static void
254	sigcb (struct ev_io *iow, int revents)	535	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	536	{
256	struct ev_signal *w;	537	WL w;
257	int sig;	538	int signum;
258		539
		540	read (sigpipe [0], &revents, 1);
259	gotsig = 0;	541	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		542
262	for (sig = signalmax; sig--; )	543	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	544	if (signals [signum].gotsig)
264	{	545	{
265	signals [sig].gotsig = 0;	546	signals [signum].gotsig = 0;
266		547
267	for (w = signals [sig].head; w; w = w->next)	548	for (w = signals [signum].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);	549	event (EV_A_ (W)w, EV_SIGNAL);
269	}	550	}
270	}	551	}
271		552
272	static void	553	static void
273	siginit (void)	554	siginit (EV_P)
274	{	555	{
		556	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	557	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	558	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		559
278	/* rather than sort out wether we really need nb, set it */	560	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	561	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	562	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		563	#endif
281		564
282	evio_set (&sigev, sigpipe [0], EV_READ);	565	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	566	ev_io_start (EV_A_ &sigev);
		567	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	568	}
285		569
286	/*****************************************************************************/	570	/*****************************************************************************/
287		571
288	static struct ev_idle **idles;	572	#ifndef WIN32
289	static int idlemax, idlecnt;
290		573
291	static struct ev_check **checks;	574	static struct ev_child *childs [PID_HASHSIZE];
292	static int checkmax, checkcnt;	575	static struct ev_signal childev;
		576
		577	#ifndef WCONTINUED
		578	# define WCONTINUED 0
		579	#endif
		580
		581	static void
		582	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		583	{
		584	struct ev_child *w;
		585
		586	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		587	if (w->pid == pid || !w->pid)
		588	{
		589	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		590	w->rpid = pid;
		591	w->rstatus = status;
		592	event (EV_A_ (W)w, EV_CHILD);
		593	}
		594	}
		595
		596	static void
		597	childcb (EV_P_ struct ev_signal *sw, int revents)
		598	{
		599	int pid, status;
		600
		601	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		602	{
		603	/* make sure we are called again until all childs have been reaped */
		604	event (EV_A_ (W)sw, EV_SIGNAL);
		605
		606	child_reap (EV_A_ sw, pid, pid, status);
		607	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		608	}
		609	}
		610
		611	#endif
293		612
294	/*****************************************************************************/	613	/*****************************************************************************/
295		614
		615	#if EV_USE_KQUEUE
		616	# include "ev_kqueue.c"
		617	#endif
296	#if HAVE_EPOLL	618	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	619	# include "ev_epoll.c"
298	#endif	620	#endif
		621	#if EV_USE_POLL
		622	# include "ev_poll.c"
		623	#endif
299	#if HAVE_SELECT	624	#if EV_USE_SELECT
300	# include "ev_select.c"	625	# include "ev_select.c"
301	#endif	626	#endif
302		627
303	int ev_init (int flags)	628	int
		629	ev_version_major (void)
304	{	630	{
		631	return EV_VERSION_MAJOR;
		632	}
		633
		634	int
		635	ev_version_minor (void)
		636	{
		637	return EV_VERSION_MINOR;
		638	}
		639
		640	/* return true if we are running with elevated privileges and should ignore env variables */
		641	static int
		642	enable_secure (void)
		643	{
		644	#ifdef WIN32
		645	return 0;
		646	#else
		647	return getuid () != geteuid ()
		648	|| getgid () != getegid ();
		649	#endif
		650	}
		651
		652	int
		653	ev_method (EV_P)
		654	{
		655	return method;
		656	}
		657
		658	static void
		659	loop_init (EV_P_ int methods)
		660	{
		661	if (!method)
		662	{
305	#if HAVE_MONOTONIC	663	#if EV_USE_MONOTONIC
306	{	664	{
307	struct timespec ts;	665	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	666	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	667	have_monotonic = 1;
310	}	668	}
311	#endif	669	#endif
312		670
313	ev_now = ev_time ();	671	rt_now = ev_time ();
314	now = get_clock ();	672	mn_now = get_clock ();
315	diff = ev_now - now;	673	now_floor = mn_now;
		674	rtmn_diff = rt_now - mn_now;
316		675
		676	if (methods == EVMETHOD_AUTO)
		677	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		678	methods = atoi (getenv ("LIBEV_METHODS"));
		679	else
		680	methods = EVMETHOD_ANY;
		681
		682	method = 0;
		683	#if EV_USE_WIN32
		684	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		685	#endif
		686	#if EV_USE_KQUEUE
		687	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		688	#endif
		689	#if EV_USE_EPOLL
		690	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		691	#endif
		692	#if EV_USE_POLL
		693	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		694	#endif
		695	#if EV_USE_SELECT
		696	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		697	#endif
		698	}
		699	}
		700
		701	void
		702	loop_destroy (EV_P)
		703	{
		704	int i;
		705
		706	#if EV_USE_WIN32
		707	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		708	#endif
		709	#if EV_USE_KQUEUE
		710	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		711	#endif
		712	#if EV_USE_EPOLL
		713	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		714	#endif
		715	#if EV_USE_POLL
		716	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		717	#endif
		718	#if EV_USE_SELECT
		719	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		720	#endif
		721
		722	for (i = NUMPRI; i--; )
		723	array_free (pending, [i]);
		724
		725	array_free (fdchange, );
		726	array_free (timer, );
		727	array_free (periodic, );
		728	array_free (idle, );
		729	array_free (prepare, );
		730	array_free (check, );
		731
		732	method = 0;
		733	/*TODO*/
		734	}
		735
		736	void
		737	loop_fork (EV_P)
		738	{
		739	/*TODO*/
		740	#if EV_USE_EPOLL
		741	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		742	#endif
		743	#if EV_USE_KQUEUE
		744	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		745	#endif
		746	}
		747
		748	#if EV_MULTIPLICITY
		749	struct ev_loop *
		750	ev_loop_new (int methods)
		751	{
		752	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		753
		754	memset (loop, 0, sizeof (struct ev_loop));
		755
		756	loop_init (EV_A_ methods);
		757
		758	if (ev_method (EV_A))
		759	return loop;
		760
		761	return 0;
		762	}
		763
		764	void
		765	ev_loop_destroy (EV_P)
		766	{
		767	loop_destroy (EV_A);
		768	ev_free (loop);
		769	}
		770
		771	void
		772	ev_loop_fork (EV_P)
		773	{
		774	loop_fork (EV_A);
		775	}
		776
		777	#endif
		778
		779	#if EV_MULTIPLICITY
		780	struct ev_loop default_loop_struct;
		781	static struct ev_loop *default_loop;
		782
		783	struct ev_loop *
		784	#else
		785	static int default_loop;
		786
		787	int
		788	#endif
		789	ev_default_loop (int methods)
		790	{
		791	if (sigpipe [0] == sigpipe [1])
317	if (pipe (sigpipe))	792	if (pipe (sigpipe))
318	return 0;	793	return 0;
319		794
320	ev_method = EVMETHOD_NONE;	795	if (!default_loop)
321	#if HAVE_EPOLL
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327
328	if (ev_method)
329	{	796	{
		797	#if EV_MULTIPLICITY
		798	struct ev_loop *loop = default_loop = &default_loop_struct;
		799	#else
		800	default_loop = 1;
		801	#endif
		802
		803	loop_init (EV_A_ methods);
		804
		805	if (ev_method (EV_A))
		806	{
330	evw_init (&sigev, sigcb, 0);	807	ev_watcher_init (&sigev, sigcb);
		808	ev_set_priority (&sigev, EV_MAXPRI);
331	siginit ();	809	siginit (EV_A);
332	}
333		810
334	return ev_method;	811	#ifndef WIN32
335	}	812	ev_signal_init (&childev, childcb, SIGCHLD);
336		813	ev_set_priority (&childev, EV_MAXPRI);
337	/*****************************************************************************/	814	ev_signal_start (EV_A_ &childev);
338		815	ev_unref (EV_A); /* child watcher should not keep loop alive */
339	void ev_prefork (void)
340	{
341	/* nop */
342	}
343
344	void ev_postfork_parent (void)
345	{
346	/* nop */
347	}
348
349	void ev_postfork_child (void)
350	{
351	#if HAVE_EPOLL
352	if (ev_method == EVMETHOD_EPOLL)
353	epoll_postfork_child ();
354	#endif	816	#endif
		817	}
		818	else
		819	default_loop = 0;
		820	}
355		821
		822	return default_loop;
		823	}
		824
		825	void
		826	ev_default_destroy (void)
		827	{
		828	#if EV_MULTIPLICITY
		829	struct ev_loop *loop = default_loop;
		830	#endif
		831
		832	ev_ref (EV_A); /* child watcher */
		833	ev_signal_stop (EV_A_ &childev);
		834
		835	ev_ref (EV_A); /* signal watcher */
356	evio_stop (&sigev);	836	ev_io_stop (EV_A_ &sigev);
		837
		838	close (sigpipe [0]); sigpipe [0] = 0;
		839	close (sigpipe [1]); sigpipe [1] = 0;
		840
		841	loop_destroy (EV_A);
		842	}
		843
		844	void
		845	ev_default_fork (void)
		846	{
		847	#if EV_MULTIPLICITY
		848	struct ev_loop *loop = default_loop;
		849	#endif
		850
		851	loop_fork (EV_A);
		852
		853	ev_io_stop (EV_A_ &sigev);
357	close (sigpipe [0]);	854	close (sigpipe [0]);
358	close (sigpipe [1]);	855	close (sigpipe [1]);
359	pipe (sigpipe);	856	pipe (sigpipe);
		857
		858	ev_ref (EV_A); /* signal watcher */
360	siginit ();	859	siginit (EV_A);
361	}	860	}
362		861
363	/*****************************************************************************/	862	/*****************************************************************************/
364		863
365	static void	864	static void
366	fd_reify (void)	865	call_pending (EV_P)
367	{	866	{
368	int i;	867	int pri;
369		868
370	for (i = 0; i < fdchangecnt; ++i)	869	for (pri = NUMPRI; pri--; )
371	{	870	while (pendingcnt [pri])
372	int fd = fdchanges [i];
373	ANFD *anfd = anfds + fd;
374	struct ev_io *w;
375
376	int wev = 0;
377
378	for (w = anfd->head; w; w = w->next)
379	wev |= w->events;
380
381	if (anfd->wev != wev)
382	{	871	{
383	method_modify (fd, anfd->wev, wev);	872	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
384	anfd->wev = wev;
385	}
386	}
387		873
388	fdchangecnt = 0;
389	}
390
391	static void
392	call_pending ()
393	{
394	int i;
395
396	for (i = 0; i < pendingcnt; ++i)
397	{
398	ANPENDING *p = pendings + i;
399
400	if (p->w)	874	if (p->w)
401	{	875	{
402	p->w->pending = 0;	876	p->w->pending = 0;
403	p->w->cb (p->w, p->events);	877	p->w->cb (EV_A_ p->w, p->events);
404	}	878	}
405	}	879	}
406
407	pendingcnt = 0;
408	}	880	}
409		881
410	static void	882	static void
411	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	883	timers_reify (EV_P)
412	{	884	{
413	while (timercnt && timers [0]->at <= now)	885	while (timercnt && ((WT)timers [0])->at <= mn_now)
414	{	886	{
415	struct ev_timer *w = timers [0];	887	struct ev_timer *w = timers [0];
		888
		889	assert (("inactive timer on timer heap detected", ev_is_active (w)));
416		890
417	/* first reschedule or stop timer */	891	/* first reschedule or stop timer */
418	if (w->repeat)	892	if (w->repeat)
419	{	893	{
420	if (w->is_abs)	894	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
421	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
422	else
423	w->at = now + w->repeat;	895	((WT)w)->at = mn_now + w->repeat;
424
425	assert (w->at > now);
426
427	downheap (timers, timercnt, 0);	896	downheap ((WT *)timers, timercnt, 0);
428	}	897	}
429	else	898	else
		899	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		900
		901	event (EV_A_ (W)w, EV_TIMEOUT);
		902	}
		903	}
		904
		905	static void
		906	periodics_reify (EV_P)
		907	{
		908	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		909	{
		910	struct ev_periodic *w = periodics [0];
		911
		912	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		913
		914	/* first reschedule or stop timer */
		915	if (w->interval)
430	{	916	{
431	evtimer_stop (w); /* nonrepeating: stop timer */	917	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
432	--timercnt; /* maybe pass by reference instead? */	918	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		919	downheap ((WT *)periodics, periodiccnt, 0);
433	}	920	}
		921	else
		922	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
434		923
435	event ((W)w, EV_TIMEOUT);	924	event (EV_A_ (W)w, EV_PERIODIC);
436	}	925	}
437	}	926	}
438		927
439	static void	928	static void
440	time_update ()	929	periodics_reschedule (EV_P)
441	{	930	{
442	int i;	931	int i;
443	ev_now = ev_time ();
444		932
445	if (have_monotonic)	933	/* adjust periodics after time jump */
		934	for (i = 0; i < periodiccnt; ++i)
446	{	935	{
447	ev_tstamp odiff = diff;	936	struct ev_periodic *w = periodics [i];
448		937
449	/* detecting time jumps is much more difficult */	938	if (w->interval)
450	for (i = 2; --i; ) /* loop a few times, before making important decisions */
451	{	939	{
452	now = get_clock ();	940	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
453	diff = ev_now - now;
454		941
455	if (fabs (odiff - diff) < MIN_TIMEJUMP)	942	if (fabs (diff) >= 1e-4)
456	return; /* all is well */	943	{
		944	ev_periodic_stop (EV_A_ w);
		945	ev_periodic_start (EV_A_ w);
457		946
458	ev_now = ev_time ();	947	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		948	}
459	}	949	}
		950	}
		951	}
460		952
461	/* time jump detected, reschedule atimers */	953	inline int
462	for (i = 0; i < atimercnt; ++i)	954	time_update_monotonic (EV_P)
		955	{
		956	mn_now = get_clock ();
		957
		958	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		959	{
		960	rt_now = rtmn_diff + mn_now;
		961	return 0;
		962	}
		963	else
		964	{
		965	now_floor = mn_now;
		966	rt_now = ev_time ();
		967	return 1;
		968	}
		969	}
		970
		971	static void
		972	time_update (EV_P)
		973	{
		974	int i;
		975
		976	#if EV_USE_MONOTONIC
		977	if (expect_true (have_monotonic))
		978	{
		979	if (time_update_monotonic (EV_A))
463	{	980	{
464	struct ev_timer *w = atimers [i];	981	ev_tstamp odiff = rtmn_diff;
465	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	982
		983	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		984	{
		985	rtmn_diff = rt_now - mn_now;
		986
		987	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		988	return; /* all is well */
		989
		990	rt_now = ev_time ();
		991	mn_now = get_clock ();
		992	now_floor = mn_now;
		993	}
		994
		995	periodics_reschedule (EV_A);
		996	/* no timer adjustment, as the monotonic clock doesn't jump */
		997	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
466	}	998	}
467	}	999	}
468	else	1000	else
		1001	#endif
469	{	1002	{
470	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1003	rt_now = ev_time ();
471	/* time jump detected, adjust rtimers */	1004
		1005	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1006	{
		1007	periodics_reschedule (EV_A);
		1008
		1009	/* adjust timers. this is easy, as the offset is the same for all */
472	for (i = 0; i < rtimercnt; ++i)	1010	for (i = 0; i < timercnt; ++i)
473	rtimers [i]->at += ev_now - now;	1011	((WT)timers [i])->at += rt_now - mn_now;
		1012	}
474		1013
475	now = ev_now;	1014	mn_now = rt_now;
476	}	1015	}
477	}	1016	}
478		1017
479	int ev_loop_done;	1018	void
		1019	ev_ref (EV_P)
		1020	{
		1021	++activecnt;
		1022	}
480		1023
		1024	void
		1025	ev_unref (EV_P)
		1026	{
		1027	--activecnt;
		1028	}
		1029
		1030	static int loop_done;
		1031
		1032	void
481	void ev_loop (int flags)	1033	ev_loop (EV_P_ int flags)
482	{	1034	{
483	double block;	1035	double block;
484	ev_loop_done = flags & EVLOOP_ONESHOT;	1036	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
485
486	if (checkcnt)
487	{
488	queue_events ((W *)checks, checkcnt, EV_CHECK);
489	call_pending ();
490	}
491		1037
492	do	1038	do
493	{	1039	{
		1040	/* queue check watchers (and execute them) */
		1041	if (expect_false (preparecnt))
		1042	{
		1043	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1044	call_pending (EV_A);
		1045	}
		1046
494	/* update fd-related kernel structures */	1047	/* update fd-related kernel structures */
495	fd_reify ();	1048	fd_reify (EV_A);
496		1049
497	/* calculate blocking time */	1050	/* calculate blocking time */
		1051
		1052	/* we only need this for !monotonic clockor timers, but as we basically
		1053	always have timers, we just calculate it always */
		1054	#if EV_USE_MONOTONIC
		1055	if (expect_true (have_monotonic))
		1056	time_update_monotonic (EV_A);
		1057	else
		1058	#endif
		1059	{
		1060	rt_now = ev_time ();
		1061	mn_now = rt_now;
		1062	}
		1063
498	if (flags & EVLOOP_NONBLOCK || idlecnt)	1064	if (flags & EVLOOP_NONBLOCK || idlecnt)
499	block = 0.;	1065	block = 0.;
500	else	1066	else
501	{	1067	{
502	block = MAX_BLOCKTIME;	1068	block = MAX_BLOCKTIME;
503		1069
504	if (rtimercnt)	1070	if (timercnt)
505	{	1071	{
506	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1072	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
507	if (block > to) block = to;	1073	if (block > to) block = to;
508	}	1074	}
509		1075
510	if (atimercnt)	1076	if (periodiccnt)
511	{	1077	{
512	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1078	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
513	if (block > to) block = to;	1079	if (block > to) block = to;
514	}	1080	}
515		1081
516	if (block < 0.) block = 0.;	1082	if (block < 0.) block = 0.;
517	}	1083	}
518		1084
519	method_poll (block);	1085	method_poll (EV_A_ block);
520		1086
521	/* update ev_now, do magic */	1087	/* update rt_now, do magic */
522	time_update ();	1088	time_update (EV_A);
523		1089
524	/* queue pending timers and reschedule them */	1090	/* queue pending timers and reschedule them */
525	/* absolute timers first */	1091	timers_reify (EV_A); /* relative timers called last */
526	timers_reify (atimers, atimercnt, ev_now);	1092	periodics_reify (EV_A); /* absolute timers called first */
527	/* relative timers second */
528	timers_reify (rtimers, rtimercnt, now);
529		1093
530	/* queue idle watchers unless io or timers are pending */	1094	/* queue idle watchers unless io or timers are pending */
531	if (!pendingcnt)	1095	if (!pendingcnt)
532	queue_events ((W *)idles, idlecnt, EV_IDLE);	1096	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
533		1097
534	/* queue check and possibly idle watchers */	1098	/* queue check watchers, to be executed first */
		1099	if (checkcnt)
535	queue_events ((W *)checks, checkcnt, EV_CHECK);	1100	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
536		1101
537	call_pending ();	1102	call_pending (EV_A);
538	}	1103	}
539	while (!ev_loop_done);	1104	while (activecnt && !loop_done);
		1105
		1106	if (loop_done != 2)
		1107	loop_done = 0;
		1108	}
		1109
		1110	void
		1111	ev_unloop (EV_P_ int how)
		1112	{
		1113	loop_done = how;
540	}	1114	}
541		1115
542	/*****************************************************************************/	1116	/*****************************************************************************/
543		1117
544	static void	1118	inline void
545	wlist_add (WL *head, WL elem)	1119	wlist_add (WL *head, WL elem)
546	{	1120	{
547	elem->next = *head;	1121	elem->next = *head;
548	*head = elem;	1122	*head = elem;
549	}	1123	}
550		1124
551	static void	1125	inline void
552	wlist_del (WL *head, WL elem)	1126	wlist_del (WL *head, WL elem)
553	{	1127	{
554	while (*head)	1128	while (*head)
555	{	1129	{
556	if (*head == elem)	1130	if (*head == elem)
…		…
561		1135
562	head = &(*head)->next;	1136	head = &(*head)->next;
563	}	1137	}
564	}	1138	}
565		1139
566	static void	1140	inline void
		1141	ev_clear_pending (EV_P_ W w)
		1142	{
		1143	if (w->pending)
		1144	{
		1145	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1146	w->pending = 0;
		1147	}
		1148	}
		1149
		1150	inline void
567	ev_start (W w, int active)	1151	ev_start (EV_P_ W w, int active)
568	{	1152	{
569	w->pending = 0;	1153	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1154	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1155
570	w->active = active;	1156	w->active = active;
		1157	ev_ref (EV_A);
571	}	1158	}
572		1159
573	static void	1160	inline void
574	ev_stop (W w)	1161	ev_stop (EV_P_ W w)
575	{	1162	{
576	if (w->pending)	1163	ev_unref (EV_A);
577	pendings [w->pending - 1].w = 0;
578
579	w->active = 0;	1164	w->active = 0;
580	}	1165	}
581		1166
582	/*****************************************************************************/	1167	/*****************************************************************************/
583		1168
584	void	1169	void
585	evio_start (struct ev_io *w)	1170	ev_io_start (EV_P_ struct ev_io *w)
586	{	1171	{
		1172	int fd = w->fd;
		1173
587	if (ev_is_active (w))	1174	if (ev_is_active (w))
588	return;	1175	return;
589		1176
590	int fd = w->fd;	1177	assert (("ev_io_start called with negative fd", fd >= 0));
591		1178
592	ev_start ((W)w, 1);	1179	ev_start (EV_A_ (W)w, 1);
593	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1180	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
594	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1181	wlist_add ((WL *)&anfds[fd].head, (WL)w);
595		1182
596	++fdchangecnt;	1183	fd_change (EV_A_ fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = fd;
599	}	1184	}
600		1185
601	void	1186	void
602	evio_stop (struct ev_io *w)	1187	ev_io_stop (EV_P_ struct ev_io *w)
603	{	1188	{
		1189	ev_clear_pending (EV_A_ (W)w);
604	if (!ev_is_active (w))	1190	if (!ev_is_active (w))
605	return;	1191	return;
606		1192
607	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1193	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
608	ev_stop ((W)w);	1194	ev_stop (EV_A_ (W)w);
609		1195
610	++fdchangecnt;	1196	fd_change (EV_A_ w->fd);
611	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612	fdchanges [fdchangecnt - 1] = w->fd;
613	}	1197	}
614		1198
615	void	1199	void
616	evtimer_start (struct ev_timer *w)	1200	ev_timer_start (EV_P_ struct ev_timer *w)
617	{	1201	{
618	if (ev_is_active (w))	1202	if (ev_is_active (w))
619	return;	1203	return;
620		1204
621	if (w->is_abs)	1205	((WT)w)->at += mn_now;
		1206
		1207	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1208
		1209	ev_start (EV_A_ (W)w, ++timercnt);
		1210	array_needsize (timers, timermax, timercnt, );
		1211	timers [timercnt - 1] = w;
		1212	upheap ((WT *)timers, timercnt - 1);
		1213
		1214	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1215	}
		1216
		1217	void
		1218	ev_timer_stop (EV_P_ struct ev_timer *w)
		1219	{
		1220	ev_clear_pending (EV_A_ (W)w);
		1221	if (!ev_is_active (w))
		1222	return;
		1223
		1224	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1225
		1226	if (((W)w)->active < timercnt--)
		1227	{
		1228	timers [((W)w)->active - 1] = timers [timercnt];
		1229	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
622	{	1230	}
623	/* this formula differs from the one in timer_reify becuse we do not round up */	1231
		1232	((WT)w)->at = w->repeat;
		1233
		1234	ev_stop (EV_A_ (W)w);
		1235	}
		1236
		1237	void
		1238	ev_timer_again (EV_P_ struct ev_timer *w)
		1239	{
		1240	if (ev_is_active (w))
		1241	{
624	if (w->repeat)	1242	if (w->repeat)
625	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1243	{
626		1244	((WT)w)->at = mn_now + w->repeat;
627	ev_start ((W)w, ++atimercnt);	1245	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
628	array_needsize (atimers, atimermax, atimercnt, );	1246	}
629	atimers [atimercnt - 1] = w;
630	upheap (atimers, atimercnt - 1);
631	}
632	else	1247	else
		1248	ev_timer_stop (EV_A_ w);
633	{	1249	}
634	w->at += now;	1250	else if (w->repeat)
635		1251	ev_timer_start (EV_A_ w);
636	ev_start ((W)w, ++rtimercnt);
637	array_needsize (rtimers, rtimermax, rtimercnt, );
638	rtimers [rtimercnt - 1] = w;
639	upheap (rtimers, rtimercnt - 1);
640	}
641
642	}	1252	}
643		1253
644	void	1254	void
645	evtimer_stop (struct ev_timer *w)	1255	ev_periodic_start (EV_P_ struct ev_periodic *w)
646	{	1256	{
		1257	if (ev_is_active (w))
		1258	return;
		1259
		1260	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1261
		1262	/* this formula differs from the one in periodic_reify because we do not always round up */
		1263	if (w->interval)
		1264	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1265
		1266	ev_start (EV_A_ (W)w, ++periodiccnt);
		1267	array_needsize (periodics, periodicmax, periodiccnt, );
		1268	periodics [periodiccnt - 1] = w;
		1269	upheap ((WT *)periodics, periodiccnt - 1);
		1270
		1271	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1272	}
		1273
		1274	void
		1275	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1276	{
		1277	ev_clear_pending (EV_A_ (W)w);
647	if (!ev_is_active (w))	1278	if (!ev_is_active (w))
648	return;	1279	return;
649		1280
650	if (w->is_abs)	1281	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
651	{	1282
652	if (w->active < atimercnt--)	1283	if (((W)w)->active < periodiccnt--)
653	{
654	atimers [w->active - 1] = atimers [atimercnt];
655	downheap (atimers, atimercnt, w->active - 1);
656	}
657	}	1284	{
658	else	1285	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1286	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
659	{	1287	}
660	if (w->active < rtimercnt--)
661	{
662	rtimers [w->active - 1] = rtimers [rtimercnt];
663	downheap (rtimers, rtimercnt, w->active - 1);
664	}
665	}
666		1288
667	ev_stop ((W)w);	1289	ev_stop (EV_A_ (W)w);
668	}	1290	}
669		1291
670	void	1292	void
671	evsignal_start (struct ev_signal *w)	1293	ev_idle_start (EV_P_ struct ev_idle *w)
672	{	1294	{
673	if (ev_is_active (w))	1295	if (ev_is_active (w))
674	return;	1296	return;
675		1297
		1298	ev_start (EV_A_ (W)w, ++idlecnt);
		1299	array_needsize (idles, idlemax, idlecnt, );
		1300	idles [idlecnt - 1] = w;
		1301	}
		1302
		1303	void
		1304	ev_idle_stop (EV_P_ struct ev_idle *w)
		1305	{
		1306	ev_clear_pending (EV_A_ (W)w);
		1307	if (ev_is_active (w))
		1308	return;
		1309
		1310	idles [((W)w)->active - 1] = idles [--idlecnt];
		1311	ev_stop (EV_A_ (W)w);
		1312	}
		1313
		1314	void
		1315	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1316	{
		1317	if (ev_is_active (w))
		1318	return;
		1319
		1320	ev_start (EV_A_ (W)w, ++preparecnt);
		1321	array_needsize (prepares, preparemax, preparecnt, );
		1322	prepares [preparecnt - 1] = w;
		1323	}
		1324
		1325	void
		1326	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1327	{
		1328	ev_clear_pending (EV_A_ (W)w);
		1329	if (ev_is_active (w))
		1330	return;
		1331
		1332	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1333	ev_stop (EV_A_ (W)w);
		1334	}
		1335
		1336	void
		1337	ev_check_start (EV_P_ struct ev_check *w)
		1338	{
		1339	if (ev_is_active (w))
		1340	return;
		1341
		1342	ev_start (EV_A_ (W)w, ++checkcnt);
		1343	array_needsize (checks, checkmax, checkcnt, );
		1344	checks [checkcnt - 1] = w;
		1345	}
		1346
		1347	void
		1348	ev_check_stop (EV_P_ struct ev_check *w)
		1349	{
		1350	ev_clear_pending (EV_A_ (W)w);
		1351	if (ev_is_active (w))
		1352	return;
		1353
		1354	checks [((W)w)->active - 1] = checks [--checkcnt];
		1355	ev_stop (EV_A_ (W)w);
		1356	}
		1357
		1358	#ifndef SA_RESTART
		1359	# define SA_RESTART 0
		1360	#endif
		1361
		1362	void
		1363	ev_signal_start (EV_P_ struct ev_signal *w)
		1364	{
		1365	#if EV_MULTIPLICITY
		1366	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1367	#endif
		1368	if (ev_is_active (w))
		1369	return;
		1370
		1371	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1372
676	ev_start ((W)w, 1);	1373	ev_start (EV_A_ (W)w, 1);
677	array_needsize (signals, signalmax, w->signum, signals_init);	1374	array_needsize (signals, signalmax, w->signum, signals_init);
678	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1375	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679		1376
680	if (!w->next)	1377	if (!((WL)w)->next)
681	{	1378	{
		1379	#if WIN32
		1380	signal (w->signum, sighandler);
		1381	#else
682	struct sigaction sa;	1382	struct sigaction sa;
683	sa.sa_handler = sighandler;	1383	sa.sa_handler = sighandler;
684	sigfillset (&sa.sa_mask);	1384	sigfillset (&sa.sa_mask);
685	sa.sa_flags = 0;	1385	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
686	sigaction (w->signum, &sa, 0);	1386	sigaction (w->signum, &sa, 0);
		1387	#endif
687	}	1388	}
688	}	1389	}
689		1390
690	void	1391	void
691	evsignal_stop (struct ev_signal *w)	1392	ev_signal_stop (EV_P_ struct ev_signal *w)
692	{	1393	{
		1394	ev_clear_pending (EV_A_ (W)w);
693	if (!ev_is_active (w))	1395	if (!ev_is_active (w))
694	return;	1396	return;
695		1397
696	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1398	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697	ev_stop ((W)w);	1399	ev_stop (EV_A_ (W)w);
698		1400
699	if (!signals [w->signum - 1].head)	1401	if (!signals [w->signum - 1].head)
700	signal (w->signum, SIG_DFL);	1402	signal (w->signum, SIG_DFL);
701	}	1403	}
702		1404
703	void evidle_start (struct ev_idle *w)	1405	void
		1406	ev_child_start (EV_P_ struct ev_child *w)
704	{	1407	{
		1408	#if EV_MULTIPLICITY
		1409	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1410	#endif
705	if (ev_is_active (w))	1411	if (ev_is_active (w))
706	return;	1412	return;
707		1413
708	ev_start ((W)w, ++idlecnt);	1414	ev_start (EV_A_ (W)w, 1);
709	array_needsize (idles, idlemax, idlecnt, );	1415	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
710	idles [idlecnt - 1] = w;
711	}	1416	}
712		1417
713	void evidle_stop (struct ev_idle *w)	1418	void
		1419	ev_child_stop (EV_P_ struct ev_child *w)
714	{	1420	{
715	idles [w->active - 1] = idles [--idlecnt];	1421	ev_clear_pending (EV_A_ (W)w);
716	ev_stop ((W)w);
717	}
718
719	void evcheck_start (struct ev_check *w)
720	{
721	if (ev_is_active (w))	1422	if (ev_is_active (w))
722	return;	1423	return;
723		1424
724	ev_start ((W)w, ++checkcnt);	1425	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
725	array_needsize (checks, checkmax, checkcnt, );
726	checks [checkcnt - 1] = w;
727	}
728
729	void evcheck_stop (struct ev_check *w)
730	{
731	checks [w->active - 1] = checks [--checkcnt];
732	ev_stop ((W)w);	1426	ev_stop (EV_A_ (W)w);
733	}	1427	}
734		1428
735	/*****************************************************************************/	1429	/*****************************************************************************/
736		1430
737	#if 0	1431	struct ev_once
738
739	static void
740	sin_cb (struct ev_io *w, int revents)
741	{	1432	{
742	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
743	}
744
745	static void
746	ocb (struct ev_timer *w, int revents)
747	{
748	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
749	evtimer_stop (w);
750	evtimer_start (w);
751	}
752
753	static void
754	scb (struct ev_signal *w, int revents)
755	{
756	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
757	}
758
759	static void
760	gcb (struct ev_signal *w, int revents)
761	{
762	fprintf (stderr, "generic %x\n", revents);
763	}
764
765	int main (void)
766	{
767	struct ev_io sin;	1433	struct ev_io io;
768
769	ev_init (0);
770
771	evw_init (&sin, sin_cb, 55);
772	evio_set (&sin, 0, EV_READ);
773	evio_start (&sin);
774
775	struct ev_timer t[10000];
776
777	#if 0
778	int i;
779	for (i = 0; i < 10000; ++i)
780	{
781	struct ev_timer *w = t + i;
782	evw_init (w, ocb, i);
783	evtimer_set_abs (w, drand48 (), 0.99775533);
784	evtimer_start (w);
785	if (drand48 () < 0.5)
786	evtimer_stop (w);
787	}
788	#endif
789
790	struct ev_timer t1;	1434	struct ev_timer to;
791	evw_init (&t1, ocb, 0);	1435	void (*cb)(int revents, void *arg);
792	evtimer_set_abs (&t1, 5, 10);	1436	void *arg;
793	evtimer_start (&t1);	1437	};
794		1438
795	struct ev_signal sig;	1439	static void
796	evw_init (&sig, scb, 65535);	1440	once_cb (EV_P_ struct ev_once *once, int revents)
797	evsignal_set (&sig, SIGQUIT);	1441	{
798	evsignal_start (&sig);	1442	void (*cb)(int revents, void *arg) = once->cb;
		1443	void *arg = once->arg;
799		1444
800	struct ev_check cw;	1445	ev_io_stop (EV_A_ &once->io);
801	evw_init (&cw, gcb, 0);	1446	ev_timer_stop (EV_A_ &once->to);
802	evcheck_start (&cw);	1447	ev_free (once);
803		1448
804	struct ev_idle iw;	1449	cb (revents, arg);
805	evw_init (&iw, gcb, 0);
806	evidle_start (&iw);
807
808	ev_loop (0);
809
810	return 0;
811	}	1450	}
812		1451
813	#endif	1452	static void
		1453	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1454	{
		1455	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1456	}
814		1457
		1458	static void
		1459	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1460	{
		1461	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1462	}
815		1463
		1464	void
		1465	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1466	{
		1467	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
816		1468
		1469	if (!once)
		1470	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1471	else
		1472	{
		1473	once->cb = cb;
		1474	once->arg = arg;
817		1475
		1476	ev_watcher_init (&once->io, once_cb_io);
		1477	if (fd >= 0)
		1478	{
		1479	ev_io_set (&once->io, fd, events);
		1480	ev_io_start (EV_A_ &once->io);
		1481	}
		1482
		1483	ev_watcher_init (&once->to, once_cb_to);
		1484	if (timeout >= 0.)
		1485	{
		1486	ev_timer_set (&once->to, timeout, 0.);
		1487	ev_timer_start (EV_A_ &once->to);
		1488	}
		1489	}
		1490	}
		1491

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