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Comparing libev/ev.c (file contents):
Revision 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs.
Revision 1.52 by root, Sat Nov 3 22:10:39 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	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
3	#include <unistd.h>	37	#include <unistd.h>
4	#include <fcntl.h>	38	#include <fcntl.h>
5	#include <signal.h>	39	#include <signal.h>
		40	#include <stddef.h>
6		41
7	#include <stdio.h>	42	#include <stdio.h>
8		43
9	#include <assert.h>	44	#include <assert.h>
10	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
11	#include <sys/time.h>	50	#include <sys/time.h>
12	#include <time.h>	51	#include <time.h>
13		52
		53	/**/
		54
		55	#ifndef EV_USE_MONOTONIC
		56	# define EV_USE_MONOTONIC 1
		57	#endif
		58
		59	#ifndef EV_USE_SELECT
		60	# define EV_USE_SELECT 1
		61	#endif
		62
		63	#ifndef EV_USEV_POLL
		64	# define EV_USEV_POLL 0 /* poll is usually slower than select, and not as well tested */
		65	#endif
		66
		67	#ifndef EV_USE_EPOLL
		68	# define EV_USE_EPOLL 0
		69	#endif
		70
		71	#ifndef EV_USE_KQUEUE
		72	# define EV_USE_KQUEUE 0
		73	#endif
		74
		75	#ifndef EV_USE_REALTIME
		76	# define EV_USE_REALTIME 1
		77	#endif
		78
		79	/**/
		80
14	#ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
16	#endif	84	#endif
17		85
		86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	89	#endif
20	#define HAVE_SELECT 1	90
		91	/**/
21		92
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	94	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		95	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		96	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
24		97
25	#include "ev.h"	98	#include "ev.h"
26		99
		100	#if __GNUC__ >= 3
		101	# define expect(expr,value) __builtin_expect ((expr),(value))
		102	# define inline inline
		103	#else
		104	# define expect(expr,value) (expr)
		105	# define inline static
		106	#endif
		107
		108	#define expect_false(expr) expect ((expr) != 0, 0)
		109	#define expect_true(expr) expect ((expr) != 0, 1)
		110
		111	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		112	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		113
27	struct ev_watcher {	114	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	115	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	116	typedef struct ev_watcher_time *WT;
33	};
34		117
35	static ev_tstamp now, diff; /* monotonic clock */	118	static ev_tstamp now_floor, mn_now, diff; /* monotonic clock */
36	ev_tstamp ev_now;	119	static ev_tstamp rt_now;
37	int ev_method;	120	static int method;
38		121
39	static int have_monotonic; /* runtime */	122	static int have_monotonic; /* runtime */
40		123
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	124	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);	125	static void (*method_modify)(EV_P_ int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);	126	static void (*method_poll)(EV_P_ ev_tstamp timeout);
		127
		128	static int activecnt; /* number of active events */
		129
		130	#if EV_USE_SELECT
		131	static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
		132	static int vec_max;
		133	#endif
		134
		135	#if EV_USEV_POLL
		136	static struct pollfd *polls;
		137	static int pollmax, pollcnt;
		138	static int *pollidxs; /* maps fds into structure indices */
		139	static int pollidxmax;
		140	#endif
		141
		142	#if EV_USE_EPOLL
		143	static int epoll_fd = -1;
		144
		145	static struct epoll_event *events;
		146	static int eventmax;
		147	#endif
		148
		149	#if EV_USE_KQUEUE
		150	static int kqueue_fd;
		151	static struct kevent *kqueue_changes;
		152	static int kqueue_changemax, kqueue_changecnt;
		153	static struct kevent *kqueue_events;
		154	static int kqueue_eventmax;
		155	#endif
44		156
45	/*****************************************************************************/	157	/*****************************************************************************/
46		158
47	ev_tstamp	159	inline ev_tstamp
48	ev_time (void)	160	ev_time (void)
49	{	161	{
50	#if HAVE_REALTIME	162	#if EV_USE_REALTIME
51	struct timespec ts;	163	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	164	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	165	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	166	#else
55	struct timeval tv;	167	struct timeval tv;
56	gettimeofday (&tv, 0);	168	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	169	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	170	#endif
59	}	171	}
60		172
61	static ev_tstamp	173	inline ev_tstamp
62	get_clock (void)	174	get_clock (void)
63	{	175	{
64	#if HAVE_MONOTONIC	176	#if EV_USE_MONOTONIC
65	if (have_monotonic)	177	if (expect_true (have_monotonic))
66	{	178	{
67	struct timespec ts;	179	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	180	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	181	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	182	}
71	#endif	183	#endif
72		184
73	return ev_time ();	185	return ev_time ();
74	}	186	}
75		187
		188	ev_tstamp
		189	ev_now (EV_P)
		190	{
		191	return rt_now;
		192	}
		193
		194	#define array_roundsize(base,n) ((n) | 4 & ~3)
		195
76	#define array_needsize(base,cur,cnt,init) \	196	#define array_needsize(base,cur,cnt,init) \
77	if ((cnt) > cur) \	197	if (expect_false ((cnt) > cur)) \
78	{ \	198	{ \
79	int newcnt = cur ? cur << 1 : 16; \	199	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	200	do \
		201	{ \
		202	newcnt = array_roundsize (base, newcnt << 1); \
		203	} \
		204	while ((cnt) > newcnt); \
		205	\
81	base = realloc (base, sizeof (*base) * (newcnt)); \	206	base = realloc (base, sizeof (*base) * (newcnt)); \
82	init (base + cur, newcnt - cur); \	207	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	208	cur = newcnt; \
84	}	209	}
85		210
86	/*****************************************************************************/	211	/*****************************************************************************/
87		212
88	typedef struct	213	typedef struct
89	{	214	{
90	struct ev_io *head;	215	struct ev_watcher_list *head;
91	unsigned char wev, rev; /* want, received event set */	216	unsigned char events;
		217	unsigned char reify;
92	} ANFD;	218	} ANFD;
93		219
94	static ANFD *anfds;	220	static ANFD *anfds;
95	static int anfdmax;	221	static int anfdmax;
96		222
		223	static void
		224	anfds_init (ANFD *base, int count)
		225	{
		226	while (count--)
		227	{
		228	base->head = 0;
		229	base->events = EV_NONE;
		230	base->reify = 0;
		231
		232	++base;
		233	}
		234	}
		235
		236	typedef struct
		237	{
		238	W w;
		239	int events;
		240	} ANPENDING;
		241
		242	static ANPENDING *pendings [NUMPRI];
		243	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
		244
		245	static void
		246	event (EV_P_ W w, int events)
		247	{
		248	if (w->pending)
		249	{
		250	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		251	return;
		252	}
		253
		254	w->pending = ++pendingcnt [ABSPRI (w)];
		255	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
		256	pendings [ABSPRI (w)][w->pending - 1].w = w;
		257	pendings [ABSPRI (w)][w->pending - 1].events = events;
		258	}
		259
		260	static void
		261	queue_events (EV_P_ W *events, int eventcnt, int type)
		262	{
		263	int i;
		264
		265	for (i = 0; i < eventcnt; ++i)
		266	event (EV_A_ events [i], type);
		267	}
		268
		269	static void
		270	fd_event (EV_P_ int fd, int events)
		271	{
		272	ANFD *anfd = anfds + fd;
		273	struct ev_io *w;
		274
		275	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		276	{
		277	int ev = w->events & events;
		278
		279	if (ev)
		280	event (EV_A_ (W)w, ev);
		281	}
		282	}
		283
		284	/*****************************************************************************/
		285
97	static int *fdchanges;	286	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;	287	static int fdchangemax, fdchangecnt;
99		288
100	static void	289	static void
101	anfds_init (ANFD *base, int count)	290	fd_reify (EV_P)
102	{	291	{
103	while (count--)	292	int i;
104	{	293
105	base->head = 0;	294	for (i = 0; i < fdchangecnt; ++i)
106	base->wev = base->rev = EV_NONE;
107	++base;
108	}	295	{
109	}	296	int fd = fdchanges [i];
110
111	typedef struct
112	{
113	struct ev_watcher *w;
114	int events;
115	} ANPENDING;
116
117	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;
119
120	static void
121	event (struct ev_watcher *w, int events)
122	{
123	w->pending = ++pendingcnt;
124	array_needsize (pendings, pendingmax, pendingcnt, );
125	pendings [pendingcnt - 1].w = w;
126	pendings [pendingcnt - 1].events = events;
127	}
128
129	static void
130	fd_event (int fd, int events)
131	{
132	ANFD *anfd = anfds + fd;	297	ANFD *anfd = anfds + fd;
		298	struct ev_io *w;
		299
		300	int events = 0;
		301
		302	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		303	events |= w->events;
		304
		305	anfd->reify = 0;
		306
		307	if (anfd->events != events)
		308	{
		309	method_modify (EV_A_ fd, anfd->events, events);
		310	anfd->events = events;
		311	}
		312	}
		313
		314	fdchangecnt = 0;
		315	}
		316
		317	static void
		318	fd_change (EV_P_ int fd)
		319	{
		320	if (anfds [fd].reify || fdchangecnt < 0)
		321	return;
		322
		323	anfds [fd].reify = 1;
		324
		325	++fdchangecnt;
		326	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		327	fdchanges [fdchangecnt - 1] = fd;
		328	}
		329
		330	static void
		331	fd_kill (EV_P_ int fd)
		332	{
133	struct ev_io *w;	333	struct ev_io *w;
134		334
135	for (w = anfd->head; w; w = w->next)	335	while ((w = (struct ev_io *)anfds [fd].head))
		336	{
		337	ev_io_stop (EV_A_ w);
		338	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		339	}
		340	}
		341
		342	/* called on EBADF to verify fds */
		343	static void
		344	fd_ebadf (EV_P)
		345	{
		346	int fd;
		347
		348	for (fd = 0; fd < anfdmax; ++fd)
		349	if (anfds [fd].events)
		350	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		351	fd_kill (EV_A_ fd);
		352	}
		353
		354	/* called on ENOMEM in select/poll to kill some fds and retry */
		355	static void
		356	fd_enomem (EV_P)
		357	{
		358	int fd = anfdmax;
		359
		360	while (fd--)
		361	if (anfds [fd].events)
136	{	362	{
137	int ev = w->events & events;	363	close (fd);
138		364	fd_kill (EV_A_ fd);
139	if (ev)	365	return;
140	event ((struct ev_watcher *)w, ev);
141	}	366	}
142	}	367	}
143		368
144	/*****************************************************************************/	369	/*****************************************************************************/
145		370
146	static struct ev_timer **atimers;	371	static struct ev_timer **timers;
147	static int atimermax, atimercnt;	372	static int timermax, timercnt;
148		373
149	static struct ev_timer **rtimers;	374	static struct ev_periodic **periodics;
150	static int rtimermax, rtimercnt;	375	static int periodicmax, periodiccnt;
151		376
152	static void	377	static void
153	upheap (struct ev_timer **timers, int k)	378	upheap (WT *timers, int k)
154	{	379	{
155	struct ev_timer *w = timers [k];	380	WT w = timers [k];
156		381
157	while (k && timers [k >> 1]->at > w->at)	382	while (k && timers [k >> 1]->at > w->at)
158	{	383	{
159	timers [k] = timers [k >> 1];	384	timers [k] = timers [k >> 1];
160	timers [k]->active = k + 1;	385	timers [k]->active = k + 1;
…		…
165	timers [k]->active = k + 1;	390	timers [k]->active = k + 1;
166		391
167	}	392	}
168		393
169	static void	394	static void
170	downheap (struct ev_timer **timers, int N, int k)	395	downheap (WT *timers, int N, int k)
171	{	396	{
172	struct ev_timer *w = timers [k];	397	WT w = timers [k];
173		398
174	while (k < (N >> 1))	399	while (k < (N >> 1))
175	{	400	{
176	int j = k << 1;	401	int j = k << 1;
177		402
…		…
192		417
193	/*****************************************************************************/	418	/*****************************************************************************/
194		419
195	typedef struct	420	typedef struct
196	{	421	{
197	struct ev_signal *head;	422	struct ev_watcher_list *head;
198	sig_atomic_t gotsig;	423	sig_atomic_t volatile gotsig;
199	} ANSIG;	424	} ANSIG;
200		425
201	static ANSIG *signals;	426	static ANSIG *signals;
202	static int signalmax;	427	static int signalmax;
203		428
204	static int sigpipe [2];	429	static int sigpipe [2];
205	static sig_atomic_t gotsig;	430	static sig_atomic_t volatile gotsig;
206	static struct ev_io sigev;	431	static struct ev_io sigev;
207		432
208	static void	433	static void
209	signals_init (ANSIG *base, int count)	434	signals_init (ANSIG *base, int count)
210	{	435	{
211	while (count--)	436	while (count--)
212	{	437	{
213	base->head = 0;	438	base->head = 0;
214	base->gotsig = 0;	439	base->gotsig = 0;
		440
215	++base;	441	++base;
216	}	442	}
217	}	443	}
218		444
219	static void	445	static void
…		…
221	{	447	{
222	signals [signum - 1].gotsig = 1;	448	signals [signum - 1].gotsig = 1;
223		449
224	if (!gotsig)	450	if (!gotsig)
225	{	451	{
		452	int old_errno = errno;
226	gotsig = 1;	453	gotsig = 1;
227	write (sigpipe [1], &gotsig, 1);	454	write (sigpipe [1], &signum, 1);
		455	errno = old_errno;
228	}	456	}
229	}	457	}
230		458
231	static void	459	static void
232	sigcb (struct ev_io *iow, int revents)	460	sigcb (EV_P_ struct ev_io *iow, int revents)
233	{	461	{
234	struct ev_signal *w;	462	struct ev_watcher_list *w;
235	int sig;	463	int signum;
236		464
		465	read (sigpipe [0], &revents, 1);
237	gotsig = 0;	466	gotsig = 0;
238	read (sigpipe [0], &revents, 1);
239		467
240	for (sig = signalmax; sig--; )	468	for (signum = signalmax; signum--; )
241	if (signals [sig].gotsig)	469	if (signals [signum].gotsig)
242	{	470	{
243	signals [sig].gotsig = 0;	471	signals [signum].gotsig = 0;
244		472
245	for (w = signals [sig].head; w; w = w->next)	473	for (w = signals [signum].head; w; w = w->next)
246	event ((struct ev_watcher *)w, EV_SIGNAL);	474	event (EV_A_ (W)w, EV_SIGNAL);
247	}	475	}
248	}	476	}
249		477
250	static void	478	static void
251	siginit (void)	479	siginit (EV_P)
252	{	480	{
		481	#ifndef WIN32
253	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	482	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
254	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	483	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
255		484
256	/* rather than sort out wether we really need nb, set it */	485	/* rather than sort out wether we really need nb, set it */
257	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	486	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
258	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	487	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		488	#endif
259		489
260	evio_set (&sigev, sigpipe [0], EV_READ);	490	ev_io_set (&sigev, sigpipe [0], EV_READ);
261	evio_start (&sigev);	491	ev_io_start (&sigev);
		492	ev_unref (EV_A); /* child watcher should not keep loop alive */
262	}	493	}
263		494
264	/*****************************************************************************/	495	/*****************************************************************************/
265		496
		497	static struct ev_idle **idles;
		498	static int idlemax, idlecnt;
		499
		500	static struct ev_prepare **prepares;
		501	static int preparemax, preparecnt;
		502
		503	static struct ev_check **checks;
		504	static int checkmax, checkcnt;
		505
		506	/*****************************************************************************/
		507
		508	static struct ev_child *childs [PID_HASHSIZE];
		509	static struct ev_signal childev;
		510
		511	#ifndef WIN32
		512
		513	#ifndef WCONTINUED
		514	# define WCONTINUED 0
		515	#endif
		516
		517	static void
		518	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		519	{
		520	struct ev_child *w;
		521
		522	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		523	if (w->pid == pid || !w->pid)
		524	{
		525	w->priority = sw->priority; /* need to do it *now* */
		526	w->rpid = pid;
		527	w->rstatus = status;
		528	event (EV_A_ (W)w, EV_CHILD);
		529	}
		530	}
		531
		532	static void
		533	childcb (EV_P_ struct ev_signal *sw, int revents)
		534	{
		535	int pid, status;
		536
		537	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		538	{
		539	/* make sure we are called again until all childs have been reaped */
		540	event (EV_A_ (W)sw, EV_SIGNAL);
		541
		542	child_reap (EV_A_ sw, pid, pid, status);
		543	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		544	}
		545	}
		546
		547	#endif
		548
		549	/*****************************************************************************/
		550
		551	#if EV_USE_KQUEUE
		552	# include "ev_kqueue.c"
		553	#endif
266	#if HAVE_EPOLL	554	#if EV_USE_EPOLL
267	# include "ev_epoll.c"	555	# include "ev_epoll.c"
268	#endif	556	#endif
		557	#if EV_USEV_POLL
		558	# include "ev_poll.c"
		559	#endif
269	#if HAVE_SELECT	560	#if EV_USE_SELECT
270	# include "ev_select.c"	561	# include "ev_select.c"
271	#endif	562	#endif
272		563
273	int ev_init (int flags)	564	int
		565	ev_version_major (void)
274	{	566	{
		567	return EV_VERSION_MAJOR;
		568	}
		569
		570	int
		571	ev_version_minor (void)
		572	{
		573	return EV_VERSION_MINOR;
		574	}
		575
		576	/* return true if we are running with elevated privileges and should ignore env variables */
		577	static int
		578	enable_secure (void)
		579	{
		580	#ifdef WIN32
		581	return 0;
		582	#else
		583	return getuid () != geteuid ()
		584	|| getgid () != getegid ();
		585	#endif
		586	}
		587
		588	int
		589	ev_method (EV_P)
		590	{
		591	return method;
		592	}
		593
		594	int
		595	ev_init (EV_P_ int methods)
		596	{
		597	if (!method)
		598	{
275	#if HAVE_MONOTONIC	599	#if EV_USE_MONOTONIC
276	{	600	{
277	struct timespec ts;	601	struct timespec ts;
278	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	602	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
279	have_monotonic = 1;	603	have_monotonic = 1;
280	}	604	}
281	#endif	605	#endif
282		606
283	ev_now = ev_time ();	607	rt_now = ev_time ();
284	now = get_clock ();	608	mn_now = get_clock ();
		609	now_floor = mn_now;
285	diff = ev_now - now;	610	diff = rt_now - mn_now;
286		611
287	if (pipe (sigpipe))	612	if (pipe (sigpipe))
288	return 0;	613	return 0;
289		614
290	ev_method = EVMETHOD_NONE;	615	if (methods == EVMETHOD_AUTO)
		616	if (!enable_secure () && getenv ("LIBmethodS"))
		617	methods = atoi (getenv ("LIBmethodS"));
		618	else
		619	methods = EVMETHOD_ANY;
		620
		621	method = 0;
		622	#if EV_USE_KQUEUE
		623	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		624	#endif
291	#if HAVE_EPOLL	625	#if EV_USE_EPOLL
292	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	626	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
293	#endif	627	#endif
		628	#if EV_USEV_POLL
		629	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		630	#endif
294	#if HAVE_SELECT	631	#if EV_USE_SELECT
295	if (ev_method == EVMETHOD_NONE) select_init (flags);	632	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
296	#endif	633	#endif
297		634
298	if (ev_method)	635	if (method)
299	{	636	{
300	evw_init (&sigev, sigcb, 0);	637	ev_watcher_init (&sigev, sigcb);
		638	ev_set_priority (&sigev, EV_MAXPRI);
301	siginit ();	639	siginit (EV_A);
302	}
303		640
		641	#ifndef WIN32
		642	ev_signal_init (&childev, childcb, SIGCHLD);
		643	ev_set_priority (&childev, EV_MAXPRI);
		644	ev_signal_start (EV_A_ &childev);
		645	ev_unref (EV_A); /* child watcher should not keep loop alive */
		646	#endif
		647	}
		648	}
		649
304	return ev_method;	650	return method;
305	}	651	}
306		652
307	/*****************************************************************************/	653	/*****************************************************************************/
308		654
309	void ev_prefork (void)	655	void
		656	ev_fork_prepare (void)
310	{	657	{
		658	/* nop */
311	}	659	}
312		660
		661	void
313	void ev_postfork_parent (void)	662	ev_fork_parent (void)
314	{	663	{
		664	/* nop */
315	}	665	}
316		666
		667	void
317	void ev_postfork_child (void)	668	ev_fork_child (void)
318	{	669	{
319	#if HAVE_EPOLL	670	#if EV_USE_EPOLL
320	if (ev_method == EVMETHOD_EPOLL)	671	if (method == EVMETHOD_EPOLL)
321	epoll_postfork_child ();	672	epoll_postfork_child ();
322	#endif	673	#endif
323		674
324	evio_stop (&sigev);	675	ev_io_stop (&sigev);
325	close (sigpipe [0]);	676	close (sigpipe [0]);
326	close (sigpipe [1]);	677	close (sigpipe [1]);
327	pipe (sigpipe);	678	pipe (sigpipe);
328	siginit ();	679	siginit ();
329	}	680	}
330		681
331	/*****************************************************************************/	682	/*****************************************************************************/
332		683
333	static ev_hook hooks [EVHOOK_NUM];
334
335	void
336	ev_hook_register (int type, ev_hook hook)
337	{
338	hooks [type] = hook;
339	}
340
341	void
342	ev_hook_unregister (int type, ev_hook hook)
343	{
344	hooks [type] = 0;
345	}
346
347	static void	684	static void
348	hook_call (int type)	685	call_pending (EV_P)
349	{	686	{
350	if (hooks [type])
351	hooks [type] ();
352	}
353
354	static void
355	fd_reify (void)
356	{
357	int i;	687	int pri;
358		688
359	for (i = 0; i < fdchangecnt; ++i)	689	for (pri = NUMPRI; pri--; )
360	{	690	while (pendingcnt [pri])
361	int fd = fdchanges [i];
362	ANFD *anfd = anfds + fd;
363	struct ev_io *w;
364
365	int wev = 0;
366
367	for (w = anfd->head; w; w = w->next)
368	wev |= w->events;
369
370	if (anfd->wev != wev)
371	{	691	{
372	method_modify (fd, anfd->wev, wev);	692	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
373	anfd->wev = wev;
374	}
375	}
376		693
377	fdchangecnt = 0;
378	}
379
380	static void
381	call_pending ()
382	{
383	int i;
384
385	for (i = 0; i < pendingcnt; ++i)
386	{
387	ANPENDING *p = pendings + i;
388
389	if (p->w)	694	if (p->w)
390	{	695	{
391	p->w->pending = 0;	696	p->w->pending = 0;
392	p->w->cb (p->w, p->events);	697	p->w->cb (EV_A_ p->w, p->events);
393	}	698	}
394	}	699	}
395
396	pendingcnt = 0;
397	}	700	}
398		701
399	static void	702	static void
400	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	703	timers_reify (EV_P)
401	{	704	{
402	while (timercnt && timers [0]->at <= now)	705	while (timercnt && timers [0]->at <= mn_now)
403	{	706	{
404	struct ev_timer *w = timers [0];	707	struct ev_timer *w = timers [0];
405		708
406	/* first reschedule or stop timer */	709	/* first reschedule or stop timer */
407	if (w->repeat)	710	if (w->repeat)
408	{	711	{
409	if (w->is_abs)	712	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
410	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
411	else
412	w->at = now + w->repeat;	713	w->at = mn_now + w->repeat;
413
414	assert (w->at > now);
415
416	downheap (timers, timercnt, 0);	714	downheap ((WT *)timers, timercnt, 0);
417	}	715	}
418	else	716	else
		717	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		718
		719	event ((W)w, EV_TIMEOUT);
		720	}
		721	}
		722
		723	static void
		724	periodics_reify (EV_P)
		725	{
		726	while (periodiccnt && periodics [0]->at <= rt_now)
		727	{
		728	struct ev_periodic *w = periodics [0];
		729
		730	/* first reschedule or stop timer */
		731	if (w->interval)
419	{	732	{
420	evtimer_stop (w); /* nonrepeating: stop timer */	733	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
421	--timercnt; /* maybe pass by reference instead? */	734	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		735	downheap ((WT *)periodics, periodiccnt, 0);
422	}	736	}
		737	else
		738	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
423		739
424	event ((struct ev_watcher *)w, EV_TIMEOUT);	740	event (EV_A_ (W)w, EV_PERIODIC);
425	}	741	}
426	}	742	}
427		743
428	static void	744	static void
429	time_update ()	745	periodics_reschedule (EV_P_ ev_tstamp diff)
430	{	746	{
431	int i;	747	int i;
432	ev_now = ev_time ();
433		748
434	if (have_monotonic)	749	/* adjust periodics after time jump */
		750	for (i = 0; i < periodiccnt; ++i)
435	{	751	{
436	ev_tstamp odiff = diff;	752	struct ev_periodic *w = periodics [i];
437		753
438	/* detecting time jumps is much more difficult */	754	if (w->interval)
439	for (i = 2; --i; ) /* loop a few times, before making important decisions */
440	{	755	{
441	now = get_clock ();	756	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
442	diff = ev_now - now;
443		757
444	if (fabs (odiff - diff) < MIN_TIMEJUMP)	758	if (fabs (diff) >= 1e-4)
445	return; /* all is well */	759	{
		760	ev_periodic_stop (EV_A_ w);
		761	ev_periodic_start (EV_A_ w);
446		762
447	ev_now = ev_time ();	763	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		764	}
448	}	765	}
		766	}
		767	}
449		768
450	/* time jump detected, reschedule atimers */	769	inline int
451	for (i = 0; i < atimercnt; ++i)	770	time_update_monotonic (EV_P)
		771	{
		772	mn_now = get_clock ();
		773
		774	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		775	{
		776	rt_now = mn_now + diff;
		777	return 0;
		778	}
		779	else
		780	{
		781	now_floor = mn_now;
		782	rt_now = ev_time ();
		783	return 1;
		784	}
		785	}
		786
		787	static void
		788	time_update (EV_P)
		789	{
		790	int i;
		791
		792	#if EV_USE_MONOTONIC
		793	if (expect_true (have_monotonic))
		794	{
		795	if (time_update_monotonic (EV_A))
452	{	796	{
453	struct ev_timer *w = atimers [i];	797	ev_tstamp odiff = diff;
454	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	798
		799	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		800	{
		801	diff = rt_now - mn_now;
		802
		803	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		804	return; /* all is well */
		805
		806	rt_now = ev_time ();
		807	mn_now = get_clock ();
		808	now_floor = mn_now;
		809	}
		810
		811	periodics_reschedule (EV_A_ diff - odiff);
		812	/* no timer adjustment, as the monotonic clock doesn't jump */
455	}	813	}
456	}	814	}
457	else	815	else
		816	#endif
458	{	817	{
459	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	818	rt_now = ev_time ();
460	/* time jump detected, adjust rtimers */	819
		820	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		821	{
		822	periodics_reschedule (EV_A_ rt_now - mn_now);
		823
		824	/* adjust timers. this is easy, as the offset is the same for all */
461	for (i = 0; i < rtimercnt; ++i)	825	for (i = 0; i < timercnt; ++i)
462	rtimers [i]->at += ev_now - now;	826	timers [i]->at += diff;
		827	}
463		828
464	now = ev_now;	829	mn_now = rt_now;
465	}	830	}
466	}	831	}
467		832
468	int ev_loop_done;	833	void
		834	ev_ref (EV_P)
		835	{
		836	++activecnt;
		837	}
469		838
		839	void
		840	ev_unref (EV_P)
		841	{
		842	--activecnt;
		843	}
		844
		845	static int loop_done;
		846
		847	void
470	void ev_loop (int flags)	848	ev_loop (EV_P_ int flags)
471	{	849	{
472	double block;	850	double block;
473	ev_loop_done = flags & EVLOOP_ONESHOT;	851	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
474		852
475	do	853	do
476	{	854	{
477	hook_call (EVHOOK_PREPOLL);	855	/* queue check watchers (and execute them) */
		856	if (expect_false (preparecnt))
		857	{
		858	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		859	call_pending (EV_A);
		860	}
478		861
479	/* update fd-related kernel structures */	862	/* update fd-related kernel structures */
480	fd_reify ();	863	fd_reify (EV_A);
481		864
482	/* calculate blocking time */	865	/* calculate blocking time */
		866
		867	/* we only need this for !monotonic clockor timers, but as we basically
		868	always have timers, we just calculate it always */
		869	#if EV_USE_MONOTONIC
		870	if (expect_true (have_monotonic))
		871	time_update_monotonic (EV_A);
		872	else
		873	#endif
		874	{
		875	rt_now = ev_time ();
		876	mn_now = rt_now;
		877	}
		878
483	if (flags & EVLOOP_NONBLOCK)	879	if (flags & EVLOOP_NONBLOCK || idlecnt)
484	block = 0.;	880	block = 0.;
485	else	881	else
486	{	882	{
487	block = MAX_BLOCKTIME;	883	block = MAX_BLOCKTIME;
488		884
489	if (rtimercnt)	885	if (timercnt)
490	{	886	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	887	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
492	if (block > to) block = to;	888	if (block > to) block = to;
493	}	889	}
494		890
495	if (atimercnt)	891	if (periodiccnt)
496	{	892	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	893	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
498	if (block > to) block = to;	894	if (block > to) block = to;
499	}	895	}
500		896
501	if (block < 0.) block = 0.;	897	if (block < 0.) block = 0.;
502	}	898	}
503		899
504	method_poll (block);	900	method_poll (EV_A_ block);
505		901
506	/* update ev_now, do magic */	902	/* update rt_now, do magic */
507	time_update ();	903	time_update (EV_A);
508		904
509	hook_call (EVHOOK_POSTPOLL);
510
511	/* put pending timers into pendign queue and reschedule them */	905	/* queue pending timers and reschedule them */
512	/* absolute timers first */	906	timers_reify (EV_A); /* relative timers called last */
513	timers_reify (atimers, atimercnt, ev_now);	907	periodics_reify (EV_A); /* absolute timers called first */
514	/* relative timers second */
515	timers_reify (rtimers, rtimercnt, now);
516		908
		909	/* queue idle watchers unless io or timers are pending */
		910	if (!pendingcnt)
		911	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		912
		913	/* queue check watchers, to be executed first */
		914	if (checkcnt)
		915	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		916
517	call_pending ();	917	call_pending (EV_A);
518	}	918	}
519	while (!ev_loop_done);	919	while (activecnt && !loop_done);
		920
		921	if (loop_done != 2)
		922	loop_done = 0;
		923	}
		924
		925	void
		926	ev_unloop (EV_P_ int how)
		927	{
		928	loop_done = how;
520	}	929	}
521		930
522	/*****************************************************************************/	931	/*****************************************************************************/
523		932
524	static void	933	inline void
525	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	934	wlist_add (WL *head, WL elem)
526	{	935	{
527	elem->next = *head;	936	elem->next = *head;
528	*head = elem;	937	*head = elem;
529	}	938	}
530		939
531	static void	940	inline void
532	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	941	wlist_del (WL *head, WL elem)
533	{	942	{
534	while (*head)	943	while (*head)
535	{	944	{
536	if (*head == elem)	945	if (*head == elem)
537	{	946	{
…		…
541		950
542	head = &(*head)->next;	951	head = &(*head)->next;
543	}	952	}
544	}	953	}
545		954
546	static void	955	inline void
547	ev_start (struct ev_watcher *w, int active)	956	ev_clear_pending (EV_P_ W w)
548	{	957	{
		958	if (w->pending)
		959	{
		960	pendings [ABSPRI (w)][w->pending - 1].w = 0;
549	w->pending = 0;	961	w->pending = 0;
		962	}
		963	}
		964
		965	inline void
		966	ev_start (EV_P_ W w, int active)
		967	{
		968	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		969	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		970
550	w->active = active;	971	w->active = active;
		972	ev_ref (EV_A);
551	}	973	}
552		974
553	static void	975	inline void
554	ev_stop (struct ev_watcher *w)	976	ev_stop (EV_P_ W w)
555	{	977	{
556	if (w->pending)	978	ev_unref (EV_A);
557	pendings [w->pending - 1].w = 0;
558
559	w->active = 0;	979	w->active = 0;
560	/* nop */
561	}	980	}
562		981
563	/*****************************************************************************/	982	/*****************************************************************************/
564		983
565	void	984	void
566	evio_start (struct ev_io *w)	985	ev_io_start (EV_P_ struct ev_io *w)
567	{	986	{
		987	int fd = w->fd;
		988
568	if (ev_is_active (w))	989	if (ev_is_active (w))
569	return;	990	return;
570		991
571	int fd = w->fd;	992	assert (("ev_io_start called with negative fd", fd >= 0));
572		993
573	ev_start ((struct ev_watcher *)w, 1);	994	ev_start (EV_A_ (W)w, 1);
574	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	995	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
575	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	996	wlist_add ((WL *)&anfds[fd].head, (WL)w);
576		997
577	++fdchangecnt;	998	fd_change (EV_A_ fd);
578	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
579	fdchanges [fdchangecnt - 1] = fd;
580	}	999	}
581		1000
582	void	1001	void
583	evio_stop (struct ev_io *w)	1002	ev_io_stop (EV_P_ struct ev_io *w)
584	{	1003	{
		1004	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1005	if (!ev_is_active (w))
586	return;	1006	return;
587		1007
588	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1008	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
589	ev_stop ((struct ev_watcher *)w);	1009	ev_stop (EV_A_ (W)w);
590		1010
591	++fdchangecnt;	1011	fd_change (EV_A_ w->fd);
592	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
593	fdchanges [fdchangecnt - 1] = w->fd;
594	}	1012	}
595		1013
596	void	1014	void
597	evtimer_start (struct ev_timer *w)	1015	ev_timer_start (EV_P_ struct ev_timer *w)
598	{	1016	{
599	if (ev_is_active (w))	1017	if (ev_is_active (w))
600	return;	1018	return;
601		1019
602	if (w->is_abs)	1020	w->at += mn_now;
		1021
		1022	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1023
		1024	ev_start (EV_A_ (W)w, ++timercnt);
		1025	array_needsize (timers, timermax, timercnt, );
		1026	timers [timercnt - 1] = w;
		1027	upheap ((WT *)timers, timercnt - 1);
		1028	}
		1029
		1030	void
		1031	ev_timer_stop (EV_P_ struct ev_timer *w)
		1032	{
		1033	ev_clear_pending (EV_A_ (W)w);
		1034	if (!ev_is_active (w))
		1035	return;
		1036
		1037	if (w->active < timercnt--)
		1038	{
		1039	timers [w->active - 1] = timers [timercnt];
		1040	downheap ((WT *)timers, timercnt, w->active - 1);
603	{	1041	}
604	/* this formula differs from the one in timer_reify becuse we do not round up */	1042
		1043	w->at = w->repeat;
		1044
		1045	ev_stop (EV_A_ (W)w);
		1046	}
		1047
		1048	void
		1049	ev_timer_again (EV_P_ struct ev_timer *w)
		1050	{
		1051	if (ev_is_active (w))
		1052	{
605	if (w->repeat)	1053	if (w->repeat)
606	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1054	{
607		1055	w->at = mn_now + w->repeat;
608	ev_start ((struct ev_watcher *)w, ++atimercnt);	1056	downheap ((WT *)timers, timercnt, w->active - 1);
609	array_needsize (atimers, atimermax, atimercnt, );	1057	}
610	atimers [atimercnt - 1] = w;
611	upheap (atimers, atimercnt - 1);
612	}
613	else	1058	else
		1059	ev_timer_stop (EV_A_ w);
614	{	1060	}
615	w->at += now;	1061	else if (w->repeat)
616		1062	ev_timer_start (EV_A_ w);
617	ev_start ((struct ev_watcher *)w, ++rtimercnt);
618	array_needsize (rtimers, rtimermax, rtimercnt, );
619	rtimers [rtimercnt - 1] = w;
620	upheap (rtimers, rtimercnt - 1);
621	}
622
623	}	1063	}
624		1064
625	void	1065	void
626	evtimer_stop (struct ev_timer *w)	1066	ev_periodic_start (EV_P_ struct ev_periodic *w)
627	{	1067	{
		1068	if (ev_is_active (w))
		1069	return;
		1070
		1071	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1072
		1073	/* this formula differs from the one in periodic_reify because we do not always round up */
		1074	if (w->interval)
		1075	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
		1076
		1077	ev_start (EV_A_ (W)w, ++periodiccnt);
		1078	array_needsize (periodics, periodicmax, periodiccnt, );
		1079	periodics [periodiccnt - 1] = w;
		1080	upheap ((WT *)periodics, periodiccnt - 1);
		1081	}
		1082
		1083	void
		1084	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1085	{
		1086	ev_clear_pending (EV_A_ (W)w);
628	if (!ev_is_active (w))	1087	if (!ev_is_active (w))
629	return;	1088	return;
630		1089
631	if (w->is_abs)
632	{
633	if (w->active < atimercnt--)	1090	if (w->active < periodiccnt--)
634	{
635	atimers [w->active - 1] = atimers [atimercnt];
636	downheap (atimers, atimercnt, w->active - 1);
637	}
638	}	1091	{
639	else	1092	periodics [w->active - 1] = periodics [periodiccnt];
		1093	downheap ((WT *)periodics, periodiccnt, w->active - 1);
640	{	1094	}
641	if (w->active < rtimercnt--)
642	{
643	rtimers [w->active - 1] = rtimers [rtimercnt];
644	downheap (rtimers, rtimercnt, w->active - 1);
645	}
646	}
647		1095
648	ev_stop ((struct ev_watcher *)w);	1096	ev_stop (EV_A_ (W)w);
649	}	1097	}
650		1098
		1099	#ifndef SA_RESTART
		1100	# define SA_RESTART 0
		1101	#endif
		1102
651	void	1103	void
652	evsignal_start (struct ev_signal *w)	1104	ev_signal_start (EV_P_ struct ev_signal *w)
653	{	1105	{
654	if (ev_is_active (w))	1106	if (ev_is_active (w))
655	return;	1107	return;
656		1108
657	ev_start ((struct ev_watcher *)w, 1);	1109	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1110
		1111	ev_start (EV_A_ (W)w, 1);
658	array_needsize (signals, signalmax, w->signum, signals_init);	1112	array_needsize (signals, signalmax, w->signum, signals_init);
659	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1113	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
660		1114
661	if (!w->next)	1115	if (!w->next)
662	{	1116	{
663	struct sigaction sa;	1117	struct sigaction sa;
664	sa.sa_handler = sighandler;	1118	sa.sa_handler = sighandler;
665	sigfillset (&sa.sa_mask);	1119	sigfillset (&sa.sa_mask);
666	sa.sa_flags = 0;	1120	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
667	sigaction (w->signum, &sa, 0);	1121	sigaction (w->signum, &sa, 0);
668	}	1122	}
669	}	1123	}
670		1124
671	void	1125	void
672	evsignal_stop (struct ev_signal *w)	1126	ev_signal_stop (EV_P_ struct ev_signal *w)
673	{	1127	{
		1128	ev_clear_pending (EV_A_ (W)w);
674	if (!ev_is_active (w))	1129	if (!ev_is_active (w))
675	return;	1130	return;
676		1131
677	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1132	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
678	ev_stop ((struct ev_watcher *)w);	1133	ev_stop (EV_A_ (W)w);
679		1134
680	if (!signals [w->signum - 1].head)	1135	if (!signals [w->signum - 1].head)
681	signal (w->signum, SIG_DFL);	1136	signal (w->signum, SIG_DFL);
682	}	1137	}
683		1138
		1139	void
		1140	ev_idle_start (EV_P_ struct ev_idle *w)
		1141	{
		1142	if (ev_is_active (w))
		1143	return;
		1144
		1145	ev_start (EV_A_ (W)w, ++idlecnt);
		1146	array_needsize (idles, idlemax, idlecnt, );
		1147	idles [idlecnt - 1] = w;
		1148	}
		1149
		1150	void
		1151	ev_idle_stop (EV_P_ struct ev_idle *w)
		1152	{
		1153	ev_clear_pending (EV_A_ (W)w);
		1154	if (ev_is_active (w))
		1155	return;
		1156
		1157	idles [w->active - 1] = idles [--idlecnt];
		1158	ev_stop (EV_A_ (W)w);
		1159	}
		1160
		1161	void
		1162	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1163	{
		1164	if (ev_is_active (w))
		1165	return;
		1166
		1167	ev_start (EV_A_ (W)w, ++preparecnt);
		1168	array_needsize (prepares, preparemax, preparecnt, );
		1169	prepares [preparecnt - 1] = w;
		1170	}
		1171
		1172	void
		1173	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1174	{
		1175	ev_clear_pending (EV_A_ (W)w);
		1176	if (ev_is_active (w))
		1177	return;
		1178
		1179	prepares [w->active - 1] = prepares [--preparecnt];
		1180	ev_stop (EV_A_ (W)w);
		1181	}
		1182
		1183	void
		1184	ev_check_start (EV_P_ struct ev_check *w)
		1185	{
		1186	if (ev_is_active (w))
		1187	return;
		1188
		1189	ev_start (EV_A_ (W)w, ++checkcnt);
		1190	array_needsize (checks, checkmax, checkcnt, );
		1191	checks [checkcnt - 1] = w;
		1192	}
		1193
		1194	void
		1195	ev_check_stop (EV_P_ struct ev_check *w)
		1196	{
		1197	ev_clear_pending (EV_A_ (W)w);
		1198	if (ev_is_active (w))
		1199	return;
		1200
		1201	checks [w->active - 1] = checks [--checkcnt];
		1202	ev_stop (EV_A_ (W)w);
		1203	}
		1204
		1205	void
		1206	ev_child_start (EV_P_ struct ev_child *w)
		1207	{
		1208	if (ev_is_active (w))
		1209	return;
		1210
		1211	ev_start (EV_A_ (W)w, 1);
		1212	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1213	}
		1214
		1215	void
		1216	ev_child_stop (EV_P_ struct ev_child *w)
		1217	{
		1218	ev_clear_pending (EV_A_ (W)w);
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1223	ev_stop (EV_A_ (W)w);
		1224	}
		1225
684	/*****************************************************************************/	1226	/*****************************************************************************/
		1227
		1228	struct ev_once
		1229	{
		1230	struct ev_io io;
		1231	struct ev_timer to;
		1232	void (*cb)(int revents, void *arg);
		1233	void *arg;
		1234	};
		1235
		1236	static void
		1237	once_cb (EV_P_ struct ev_once *once, int revents)
		1238	{
		1239	void (*cb)(int revents, void *arg) = once->cb;
		1240	void *arg = once->arg;
		1241
		1242	ev_io_stop (EV_A_ &once->io);
		1243	ev_timer_stop (EV_A_ &once->to);
		1244	free (once);
		1245
		1246	cb (revents, arg);
		1247	}
		1248
		1249	static void
		1250	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1251	{
		1252	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1253	}
		1254
		1255	static void
		1256	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1257	{
		1258	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1259	}
		1260
		1261	void
		1262	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1263	{
		1264	struct ev_once *once = malloc (sizeof (struct ev_once));
		1265
		1266	if (!once)
		1267	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1268	else
		1269	{
		1270	once->cb = cb;
		1271	once->arg = arg;
		1272
		1273	ev_watcher_init (&once->io, once_cb_io);
		1274	if (fd >= 0)
		1275	{
		1276	ev_io_set (&once->io, fd, events);
		1277	ev_io_start (EV_A_ &once->io);
		1278	}
		1279
		1280	ev_watcher_init (&once->to, once_cb_to);
		1281	if (timeout >= 0.)
		1282	{
		1283	ev_timer_set (&once->to, timeout, 0.);
		1284	ev_timer_start (EV_A_ &once->to);
		1285	}
		1286	}
		1287	}
		1288
		1289	/*****************************************************************************/
		1290
685	#if 1	1291	#if 0
		1292
		1293	struct ev_io wio;
686		1294
687	static void	1295	static void
688	sin_cb (struct ev_io *w, int revents)	1296	sin_cb (struct ev_io *w, int revents)
689	{	1297	{
690	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1298	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
…		…
692		1300
693	static void	1301	static void
694	ocb (struct ev_timer *w, int revents)	1302	ocb (struct ev_timer *w, int revents)
695	{	1303	{
696	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1304	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
697	evtimer_stop (w);	1305	ev_timer_stop (w);
698	evtimer_start (w);	1306	ev_timer_start (w);
699	}	1307	}
700		1308
701	static void	1309	static void
702	scb (struct ev_signal *w, int revents)	1310	scb (struct ev_signal *w, int revents)
703	{	1311	{
704	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1312	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1313	ev_io_stop (&wio);
		1314	ev_io_start (&wio);
		1315	}
		1316
		1317	static void
		1318	gcb (struct ev_signal *w, int revents)
		1319	{
		1320	fprintf (stderr, "generic %x\n", revents);
		1321
705	}	1322	}
706		1323
707	int main (void)	1324	int main (void)
708	{	1325	{
709	struct ev_io sin;
710
711	ev_init (0);	1326	ev_init (0);
712		1327
713	evw_init (&sin, sin_cb, 55);
714	evio_set (&sin, 0, EV_READ);	1328	ev_io_init (&wio, sin_cb, 0, EV_READ);
715	evio_start (&sin);	1329	ev_io_start (&wio);
716		1330
717	struct ev_timer t[10000];	1331	struct ev_timer t[10000];
718		1332
719	#if 1	1333	#if 0
720	int i;	1334	int i;
721	for (i = 0; i < 10000; ++i)	1335	for (i = 0; i < 10000; ++i)
722	{	1336	{
723	struct ev_timer *w = t + i;	1337	struct ev_timer *w = t + i;
724	evw_init (w, ocb, i);	1338	ev_watcher_init (w, ocb, i);
725	evtimer_set_abs (w, drand48 (), 0.99775533);	1339	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
726	evtimer_start (w);	1340	ev_timer_start (w);
727	if (drand48 () < 0.5)	1341	if (drand48 () < 0.5)
728	evtimer_stop (w);	1342	ev_timer_stop (w);
729	}	1343	}
730	#endif	1344	#endif
731		1345
732	struct ev_timer t1;	1346	struct ev_timer t1;
733	evw_init (&t1, ocb, 0);	1347	ev_timer_init (&t1, ocb, 5, 10);
734	evtimer_set_abs (&t1, 5, 10);
735	evtimer_start (&t1);	1348	ev_timer_start (&t1);
736		1349
737	struct ev_signal sig;	1350	struct ev_signal sig;
738	evw_init (&sig, scb, 65535);
739	evsignal_set (&sig, SIGQUIT);	1351	ev_signal_init (&sig, scb, SIGQUIT);
740	evsignal_start (&sig);	1352	ev_signal_start (&sig);
		1353
		1354	struct ev_check cw;
		1355	ev_check_init (&cw, gcb);
		1356	ev_check_start (&cw);
		1357
		1358	struct ev_idle iw;
		1359	ev_idle_init (&iw, gcb);
		1360	ev_idle_start (&iw);
741		1361
742	ev_loop (0);	1362	ev_loop (0);
743		1363
744	return 0;	1364	return 0;
745	}	1365	}

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