[ViewVC] Diff of: cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs.
Revision 1.70 by root, Tue Nov 6 00:52:32 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
		77	#ifndef EV_USE_MONOTONIC
		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
		102	# endif
		103	#endif
		104
		105	#ifndef EV_USE_REALTIME
		106	# define EV_USE_REALTIME 1
		107	#endif
		108
		109	/**/
		110
14	#ifdef CLOCK_MONOTONIC	111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	113	# define EV_USE_MONOTONIC 0
16	#endif	114	#endif
17		115
		116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	119	#endif
20	#define HAVE_SELECT 1	120
		121	/**/
21		122
22	#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) */
23	#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 */
24		127
25	#include "ev.h"	128	#include "ev.h"
26		129
		130	#if __GNUC__ >= 3
		131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
		137
		138	#define expect_false(expr) expect ((expr) != 0, 0)
		139	#define expect_true(expr) expect ((expr) != 0, 1)
		140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		143
27	struct ev_watcher {	144	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
		147
		148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		149
		150	#if WIN32
		151	/* note: the comment below could not be substantiated, but what would I care */
		152	/* MSDN says this is required to handle SIGFPE */
		153	volatile double SIGFPE_REQ = 0.0f;
		154	#endif
		155
		156	/*****************************************************************************/
		157
		158	static void (syserr_cb)(const char msg);
		159
		160	void ev_set_syserr_cb (void (cb)(const char msg))
		161	{
		162	syserr_cb = cb;
		163	}
		164
		165	static void
		166	syserr (const char *msg)
		167	{
		168	if (!msg)
		169	msg = "(libev) system error";
		170
		171	if (syserr_cb)
		172	syserr_cb (msg);
		173	else
		174	{
		175	perror (msg);
		176	abort ();
		177	}
		178	}
		179
		180	static void (alloc)(void *ptr, long size);
		181
		182	void ev_set_allocator (void (cb)(void *ptr, long size))
		183	{
		184	alloc = cb;
		185	}
		186
		187	static void *
		188	ev_realloc (void *ptr, long size)
		189	{
		190	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		191
		192	if (!ptr && size)
		193	{
		194	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		195	abort ();
		196	}
		197
		198	return ptr;
		199	}
		200
		201	#define ev_malloc(size) ev_realloc (0, (size))
		202	#define ev_free(ptr) ev_realloc ((ptr), 0)
		203
		204	/*****************************************************************************/
		205
		206	typedef struct
		207	{
		208	WL head;
		209	unsigned char events;
		210	unsigned char reify;
		211	} ANFD;
		212
		213	typedef struct
		214	{
		215	W w;
		216	int events;
		217	} ANPENDING;
		218
		219	#if EV_MULTIPLICITY
		220
		221	struct ev_loop
		222	{
		223	# define VAR(name,decl) decl;
		224	# include "ev_vars.h"
29	};	225	};
		226	# undef VAR
		227	# include "ev_wrap.h"
30		228
31	struct ev_watcher_list {	229	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		230
35	static ev_tstamp now, diff; /* monotonic clock */	231	# define VAR(name,decl) static decl;
36	ev_tstamp ev_now;	232	# include "ev_vars.h"
37	int ev_method;	233	# undef VAR
38		234
39	static int have_monotonic; /* runtime */	235	#endif
40
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		236
45	/*****************************************************************************/	237	/*****************************************************************************/
46		238
47	ev_tstamp	239	inline ev_tstamp
48	ev_time (void)	240	ev_time (void)
49	{	241	{
50	#if HAVE_REALTIME	242	#if EV_USE_REALTIME
51	struct timespec ts;	243	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	244	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	245	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	246	#else
55	struct timeval tv;	247	struct timeval tv;
56	gettimeofday (&tv, 0);	248	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	249	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	250	#endif
59	}	251	}
60		252
61	static ev_tstamp	253	inline ev_tstamp
62	get_clock (void)	254	get_clock (void)
63	{	255	{
64	#if HAVE_MONOTONIC	256	#if EV_USE_MONOTONIC
65	if (have_monotonic)	257	if (expect_true (have_monotonic))
66	{	258	{
67	struct timespec ts;	259	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	260	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	261	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	262	}
71	#endif	263	#endif
72		264
73	return ev_time ();	265	return ev_time ();
74	}	266	}
75		267
		268	ev_tstamp
		269	ev_now (EV_P)
		270	{
		271	return rt_now;
		272	}
		273
		274	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		275
76	#define array_needsize(base,cur,cnt,init) \	276	#define array_needsize(base,cur,cnt,init) \
77	if ((cnt) > cur) \	277	if (expect_false ((cnt) > cur)) \
78	{ \	278	{ \
79	int newcnt = cur ? cur << 1 : 16; \	279	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	280	do \
		281	{ \
		282	newcnt = array_roundsize (base, newcnt << 1); \
		283	} \
		284	while ((cnt) > newcnt); \
		285	\
81	base = realloc (base, sizeof (base) (newcnt)); \	286	base = ev_realloc (base, sizeof (base) (newcnt)); \
82	init (base + cur, newcnt - cur); \	287	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	288	cur = newcnt; \
84	}	289	}
		290
		291	#define array_slim(stem) \
		292	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		293	{ \
		294	stem ## max = array_roundsize (stem ## cnt >> 1); \
		295	base = ev_realloc (base, sizeof (base) (stem ## max)); \
		296	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		297	}
		298
		299	#define array_free(stem, idx) \
		300	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
85		301
86	/*****************************************************************************/	302	/*****************************************************************************/
87		303
88	typedef struct
89	{
90	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */
92	} ANFD;
93
94	static ANFD *anfds;
95	static int anfdmax;
96
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void	304	static void
101	anfds_init (ANFD *base, int count)	305	anfds_init (ANFD *base, int count)
102	{	306	{
103	while (count--)	307	while (count--)
104	{	308	{
105	base->head = 0;	309	base->head = 0;
106	base->wev = base->rev = EV_NONE;	310	base->events = EV_NONE;
		311	base->reify = 0;
		312
107	++base;	313	++base;
108	}	314	}
109	}	315	}
110		316
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	317	static void
121	event (struct ev_watcher *w, int events)	318	event (EV_P_ W w, int events)
122	{	319	{
		320	if (w->pending)
		321	{
		322	pendings [ABSPRI (w)][w->pending - 1].events \|= events;
		323	return;
		324	}
		325
123	w->pending = ++pendingcnt;	326	w->pending = ++pendingcnt [ABSPRI (w)];
124	array_needsize (pendings, pendingmax, pendingcnt, );	327	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
125	pendings [pendingcnt - 1].w = w;	328	pendings [ABSPRI (w)][w->pending - 1].w = w;
126	pendings [pendingcnt - 1].events = events;	329	pendings [ABSPRI (w)][w->pending - 1].events = events;
127	}	330	}
128		331
129	static void	332	static void
		333	queue_events (EV_P_ W *events, int eventcnt, int type)
		334	{
		335	int i;
		336
		337	for (i = 0; i < eventcnt; ++i)
		338	event (EV_A_ events [i], type);
		339	}
		340
		341	static void
130	fd_event (int fd, int events)	342	fd_event (EV_P_ int fd, int events)
131	{	343	{
132	ANFD *anfd = anfds + fd;	344	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	345	struct ev_io *w;
134		346
135	for (w = anfd->head; w; w = w->next)	347	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
136	{	348	{
137	int ev = w->events & events;	349	int ev = w->events & events;
138		350
139	if (ev)	351	if (ev)
140	event ((struct ev_watcher *)w, ev);	352	event (EV_A_ (W)w, ev);
141	}	353	}
142	}	354	}
143		355
144	/*****************************************************************************/	356	/*****************************************************************************/
145		357
146	static struct ev_timer **atimers;
147	static int atimermax, atimercnt;
148
149	static struct ev_timer **rtimers;
150	static int rtimermax, rtimercnt;
151
152	static void	358	static void
153	upheap (struct ev_timer **timers, int k)	359	fd_reify (EV_P)
154	{	360	{
155	struct ev_timer *w = timers [k];	361	int i;
156		362
		363	for (i = 0; i < fdchangecnt; ++i)
		364	{
		365	int fd = fdchanges [i];
		366	ANFD *anfd = anfds + fd;
		367	struct ev_io *w;
		368
		369	int events = 0;
		370
		371	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		372	events \|= w->events;
		373
		374	anfd->reify = 0;
		375
		376	method_modify (EV_A_ fd, anfd->events, events);
		377	anfd->events = events;
		378	}
		379
		380	fdchangecnt = 0;
		381	}
		382
		383	static void
		384	fd_change (EV_P_ int fd)
		385	{
		386	if (anfds [fd].reify)
		387	return;
		388
		389	anfds [fd].reify = 1;
		390
		391	++fdchangecnt;
		392	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		393	fdchanges [fdchangecnt - 1] = fd;
		394	}
		395
		396	static void
		397	fd_kill (EV_P_ int fd)
		398	{
		399	struct ev_io *w;
		400
		401	while ((w = (struct ev_io *)anfds [fd].head))
		402	{
		403	ev_io_stop (EV_A_ w);
		404	event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		405	}
		406	}
		407
		408	/* called on EBADF to verify fds */
		409	static void
		410	fd_ebadf (EV_P)
		411	{
		412	int fd;
		413
		414	for (fd = 0; fd < anfdmax; ++fd)
		415	if (anfds [fd].events)
		416	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		417	fd_kill (EV_A_ fd);
		418	}
		419
		420	/* called on ENOMEM in select/poll to kill some fds and retry */
		421	static void
		422	fd_enomem (EV_P)
		423	{
		424	int fd;
		425
		426	for (fd = anfdmax; fd--; )
		427	if (anfds [fd].events)
		428	{
		429	fd_kill (EV_A_ fd);
		430	return;
		431	}
		432	}
		433
		434	/* usually called after fork if method needs to re-arm all fds from scratch */
		435	static void
		436	fd_rearm_all (EV_P)
		437	{
		438	int fd;
		439
		440	/* this should be highly optimised to not do anything but set a flag */
		441	for (fd = 0; fd < anfdmax; ++fd)
		442	if (anfds [fd].events)
		443	{
		444	anfds [fd].events = 0;
		445	fd_change (EV_A_ fd);
		446	}
		447	}
		448
		449	/*****************************************************************************/
		450
		451	static void
		452	upheap (WT *heap, int k)
		453	{
		454	WT w = heap [k];
		455
157	while (k && timers [k >> 1]->at > w->at)	456	while (k && heap [k >> 1]->at > w->at)
158	{	457	{
159	timers [k] = timers [k >> 1];	458	heap [k] = heap [k >> 1];
160	timers [k]->active = k + 1;	459	((W)heap [k])->active = k + 1;
161	k >>= 1;	460	k >>= 1;
162	}	461	}
163		462
164	timers [k] = w;	463	heap [k] = w;
165	timers [k]->active = k + 1;	464	((W)heap [k])->active = k + 1;
166		465
167	}	466	}
168		467
169	static void	468	static void
170	downheap (struct ev_timer **timers, int N, int k)	469	downheap (WT *heap, int N, int k)
171	{	470	{
172	struct ev_timer *w = timers [k];	471	WT w = heap [k];
173		472
174	while (k < (N >> 1))	473	while (k < (N >> 1))
175	{	474	{
176	int j = k << 1;	475	int j = k << 1;
177		476
178	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	477	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
179	++j;	478	++j;
180		479
181	if (w->at <= timers [j]->at)	480	if (w->at <= heap [j]->at)
182	break;	481	break;
183		482
184	timers [k] = timers [j];	483	heap [k] = heap [j];
185	timers [k]->active = k + 1;	484	((W)heap [k])->active = k + 1;
186	k = j;	485	k = j;
187	}	486	}
188		487
189	timers [k] = w;	488	heap [k] = w;
190	timers [k]->active = k + 1;	489	((W)heap [k])->active = k + 1;
191	}	490	}
192		491
193	/*****************************************************************************/	492	/*****************************************************************************/
194		493
195	typedef struct	494	typedef struct
196	{	495	{
197	struct ev_signal *head;	496	WL head;
198	sig_atomic_t gotsig;	497	sig_atomic_t volatile gotsig;
199	} ANSIG;	498	} ANSIG;
200		499
201	static ANSIG *signals;	500	static ANSIG *signals;
202	static int signalmax;	501	static int signalmax;
203		502
204	static int sigpipe [2];	503	static int sigpipe [2];
205	static sig_atomic_t gotsig;	504	static sig_atomic_t volatile gotsig;
206	static struct ev_io sigev;	505	static struct ev_io sigev;
207		506
208	static void	507	static void
209	signals_init (ANSIG *base, int count)	508	signals_init (ANSIG *base, int count)
210	{	509	{
211	while (count--)	510	while (count--)
212	{	511	{
213	base->head = 0;	512	base->head = 0;
214	base->gotsig = 0;	513	base->gotsig = 0;
		514
215	++base;	515	++base;
216	}	516	}
217	}	517	}
218		518
219	static void	519	static void
220	sighandler (int signum)	520	sighandler (int signum)
221	{	521	{
		522	#if WIN32
		523	signal (signum, sighandler);
		524	#endif
		525
222	signals [signum - 1].gotsig = 1;	526	signals [signum - 1].gotsig = 1;
223		527
224	if (!gotsig)	528	if (!gotsig)
225	{	529	{
		530	int old_errno = errno;
226	gotsig = 1;	531	gotsig = 1;
227	write (sigpipe [1], &gotsig, 1);	532	write (sigpipe [1], &signum, 1);
		533	errno = old_errno;
228	}	534	}
229	}	535	}
230		536
231	static void	537	static void
232	sigcb (struct ev_io *iow, int revents)	538	sigcb (EV_P_ struct ev_io *iow, int revents)
233	{	539	{
234	struct ev_signal *w;	540	WL w;
235	int sig;	541	int signum;
236		542
		543	read (sigpipe [0], &revents, 1);
237	gotsig = 0;	544	gotsig = 0;
238	read (sigpipe [0], &revents, 1);
239		545
240	for (sig = signalmax; sig--; )	546	for (signum = signalmax; signum--; )
241	if (signals [sig].gotsig)	547	if (signals [signum].gotsig)
242	{	548	{
243	signals [sig].gotsig = 0;	549	signals [signum].gotsig = 0;
244		550
245	for (w = signals [sig].head; w; w = w->next)	551	for (w = signals [signum].head; w; w = w->next)
246	event ((struct ev_watcher *)w, EV_SIGNAL);	552	event (EV_A_ (W)w, EV_SIGNAL);
247	}	553	}
248	}	554	}
249		555
250	static void	556	static void
251	siginit (void)	557	siginit (EV_P)
252	{	558	{
		559	#ifndef WIN32
253	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	560	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
254	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	561	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
255		562
256	/* rather than sort out wether we really need nb, set it */	563	/* rather than sort out wether we really need nb, set it */
257	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	564	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
258	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	565	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		566	#endif
259		567
260	evio_set (&sigev, sigpipe [0], EV_READ);	568	ev_io_set (&sigev, sigpipe [0], EV_READ);
261	evio_start (&sigev);	569	ev_io_start (EV_A_ &sigev);
		570	ev_unref (EV_A); /* child watcher should not keep loop alive */
262	}	571	}
263		572
264	/*****************************************************************************/	573	/*****************************************************************************/
265		574
		575	#ifndef WIN32
		576
		577	static struct ev_child *childs [PID_HASHSIZE];
		578	static struct ev_signal childev;
		579
		580	#ifndef WCONTINUED
		581	# define WCONTINUED 0
		582	#endif
		583
		584	static void
		585	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		586	{
		587	struct ev_child *w;
		588
		589	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		590	if (w->pid == pid \|\| !w->pid)
		591	{
		592	ev_priority (w) = ev_priority (sw); /* need to do it now */
		593	w->rpid = pid;
		594	w->rstatus = status;
		595	event (EV_A_ (W)w, EV_CHILD);
		596	}
		597	}
		598
		599	static void
		600	childcb (EV_P_ struct ev_signal *sw, int revents)
		601	{
		602	int pid, status;
		603
		604	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		605	{
		606	/* make sure we are called again until all childs have been reaped */
		607	event (EV_A_ (W)sw, EV_SIGNAL);
		608
		609	child_reap (EV_A_ sw, pid, pid, status);
		610	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		611	}
		612	}
		613
		614	#endif
		615
		616	/*****************************************************************************/
		617
		618	#if EV_USE_KQUEUE
		619	# include "ev_kqueue.c"
		620	#endif
266	#if HAVE_EPOLL	621	#if EV_USE_EPOLL
267	# include "ev_epoll.c"	622	# include "ev_epoll.c"
268	#endif	623	#endif
		624	#if EV_USE_POLL
		625	# include "ev_poll.c"
		626	#endif
269	#if HAVE_SELECT	627	#if EV_USE_SELECT
270	# include "ev_select.c"	628	# include "ev_select.c"
271	#endif	629	#endif
272		630
273	int ev_init (int flags)	631	int
		632	ev_version_major (void)
274	{	633	{
		634	return EV_VERSION_MAJOR;
		635	}
		636
		637	int
		638	ev_version_minor (void)
		639	{
		640	return EV_VERSION_MINOR;
		641	}
		642
		643	/* return true if we are running with elevated privileges and should ignore env variables */
		644	static int
		645	enable_secure (void)
		646	{
		647	#ifdef WIN32
		648	return 0;
		649	#else
		650	return getuid () != geteuid ()
		651	\|\| getgid () != getegid ();
		652	#endif
		653	}
		654
		655	int
		656	ev_method (EV_P)
		657	{
		658	return method;
		659	}
		660
		661	static void
		662	loop_init (EV_P_ int methods)
		663	{
		664	if (!method)
		665	{
275	#if HAVE_MONOTONIC	666	#if EV_USE_MONOTONIC
276	{	667	{
277	struct timespec ts;	668	struct timespec ts;
278	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	669	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
279	have_monotonic = 1;	670	have_monotonic = 1;
280	}	671	}
281	#endif	672	#endif
282		673
283	ev_now = ev_time ();	674	rt_now = ev_time ();
284	now = get_clock ();	675	mn_now = get_clock ();
285	diff = ev_now - now;	676	now_floor = mn_now;
		677	rtmn_diff = rt_now - mn_now;
286		678
		679	if (methods == EVMETHOD_AUTO)
		680	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		681	methods = atoi (getenv ("LIBEV_METHODS"));
		682	else
		683	methods = EVMETHOD_ANY;
		684
		685	method = 0;
		686	#if EV_USE_WIN32
		687	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		688	#endif
		689	#if EV_USE_KQUEUE
		690	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		691	#endif
		692	#if EV_USE_EPOLL
		693	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		694	#endif
		695	#if EV_USE_POLL
		696	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		697	#endif
		698	#if EV_USE_SELECT
		699	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		700	#endif
		701
		702	ev_watcher_init (&sigev, sigcb);
		703	ev_set_priority (&sigev, EV_MAXPRI);
		704	}
		705	}
		706
		707	void
		708	loop_destroy (EV_P)
		709	{
		710	int i;
		711
		712	#if EV_USE_WIN32
		713	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		714	#endif
		715	#if EV_USE_KQUEUE
		716	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		717	#endif
		718	#if EV_USE_EPOLL
		719	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		720	#endif
		721	#if EV_USE_POLL
		722	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		723	#endif
		724	#if EV_USE_SELECT
		725	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		726	#endif
		727
		728	for (i = NUMPRI; i--; )
		729	array_free (pending, [i]);
		730
		731	array_free (fdchange, );
		732	array_free (timer, );
		733	array_free (periodic, );
		734	array_free (idle, );
		735	array_free (prepare, );
		736	array_free (check, );
		737
		738	method = 0;
		739	}
		740
		741	static void
		742	loop_fork (EV_P)
		743	{
		744	#if EV_USE_EPOLL
		745	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		746	#endif
		747	#if EV_USE_KQUEUE
		748	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		749	#endif
		750
		751	if (ev_is_active (&sigev))
		752	{
		753	/* default loop */
		754
		755	ev_ref (EV_A);
		756	ev_io_stop (EV_A_ &sigev);
		757	close (sigpipe [0]);
		758	close (sigpipe [1]);
		759
		760	while (pipe (sigpipe))
		761	syserr ("(libev) error creating pipe");
		762
		763	siginit (EV_A);
		764	}
		765
		766	postfork = 0;
		767	}
		768
		769	#if EV_MULTIPLICITY
		770	struct ev_loop *
		771	ev_loop_new (int methods)
		772	{
		773	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		774
		775	memset (loop, 0, sizeof (struct ev_loop));
		776
		777	loop_init (EV_A_ methods);
		778
		779	if (ev_method (EV_A))
		780	return loop;
		781
		782	return 0;
		783	}
		784
		785	void
		786	ev_loop_destroy (EV_P)
		787	{
		788	loop_destroy (EV_A);
		789	ev_free (loop);
		790	}
		791
		792	void
		793	ev_loop_fork (EV_P)
		794	{
		795	postfork = 1;
		796	}
		797
		798	#endif
		799
		800	#if EV_MULTIPLICITY
		801	struct ev_loop default_loop_struct;
		802	static struct ev_loop *default_loop;
		803
		804	struct ev_loop *
		805	#else
		806	static int default_loop;
		807
		808	int
		809	#endif
		810	ev_default_loop (int methods)
		811	{
		812	if (sigpipe [0] == sigpipe [1])
287	if (pipe (sigpipe))	813	if (pipe (sigpipe))
288	return 0;	814	return 0;
289		815
290	ev_method = EVMETHOD_NONE;	816	if (!default_loop)
291	#if HAVE_EPOLL	817	{
292	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	818	#if EV_MULTIPLICITY
		819	struct ev_loop *loop = default_loop = &default_loop_struct;
		820	#else
		821	default_loop = 1;
293	#endif	822	#endif
294	#if HAVE_SELECT
295	if (ev_method == EVMETHOD_NONE) select_init (flags);
296	#endif
297		823
		824	loop_init (EV_A_ methods);
		825
		826	if (ev_method (EV_A))
		827	{
		828	siginit (EV_A);
		829
		830	#ifndef WIN32
		831	ev_signal_init (&childev, childcb, SIGCHLD);
		832	ev_set_priority (&childev, EV_MAXPRI);
		833	ev_signal_start (EV_A_ &childev);
		834	ev_unref (EV_A); /* child watcher should not keep loop alive */
		835	#endif
		836	}
		837	else
		838	default_loop = 0;
		839	}
		840
		841	return default_loop;
		842	}
		843
		844	void
		845	ev_default_destroy (void)
		846	{
		847	#if EV_MULTIPLICITY
		848	struct ev_loop *loop = default_loop;
		849	#endif
		850
		851	ev_ref (EV_A); /* child watcher */
		852	ev_signal_stop (EV_A_ &childev);
		853
		854	ev_ref (EV_A); /* signal watcher */
		855	ev_io_stop (EV_A_ &sigev);
		856
		857	close (sigpipe [0]); sigpipe [0] = 0;
		858	close (sigpipe [1]); sigpipe [1] = 0;
		859
		860	loop_destroy (EV_A);
		861	}
		862
		863	void
		864	ev_default_fork (void)
		865	{
		866	#if EV_MULTIPLICITY
		867	struct ev_loop *loop = default_loop;
		868	#endif
		869
298	if (ev_method)	870	if (method)
299	{	871	postfork = 1;
300	evw_init (&sigev, sigcb, 0);
301	siginit ();
302	}
303
304	return ev_method;
305	}	872	}
306		873
307	/*****************************************************************************/	874	/*****************************************************************************/
308		875
309	void ev_prefork (void)
310	{
311	}
312
313	void ev_postfork_parent (void)
314	{
315	}
316
317	void ev_postfork_child (void)
318	{
319	#if HAVE_EPOLL
320	if (ev_method == EVMETHOD_EPOLL)
321	epoll_postfork_child ();
322	#endif
323
324	evio_stop (&sigev);
325	close (sigpipe [0]);
326	close (sigpipe [1]);
327	pipe (sigpipe);
328	siginit ();
329	}
330
331	/*****************************************************************************/
332
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	876	static void
348	hook_call (int type)	877	call_pending (EV_P)
349	{	878	{
350	if (hooks [type])
351	hooks [type] ();
352	}
353
354	static void
355	fd_reify (void)
356	{
357	int i;	879	int pri;
358		880
359	for (i = 0; i < fdchangecnt; ++i)	881	for (pri = NUMPRI; pri--; )
360	{	882	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	{	883	{
372	method_modify (fd, anfd->wev, wev);	884	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
373	anfd->wev = wev;
374	}
375	}
376		885
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)	886	if (p->w)
390	{	887	{
391	p->w->pending = 0;	888	p->w->pending = 0;
392	p->w->cb (p->w, p->events);	889	p->w->cb (EV_A_ p->w, p->events);
393	}	890	}
394	}	891	}
395
396	pendingcnt = 0;
397	}	892	}
398		893
399	static void	894	static void
400	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	895	timers_reify (EV_P)
401	{	896	{
402	while (timercnt && timers [0]->at <= now)	897	while (timercnt && ((WT)timers [0])->at <= mn_now)
403	{	898	{
404	struct ev_timer *w = timers [0];	899	struct ev_timer *w = timers [0];
		900
		901	assert (("inactive timer on timer heap detected", ev_is_active (w)));
405		902
406	/* first reschedule or stop timer */	903	/* first reschedule or stop timer */
407	if (w->repeat)	904	if (w->repeat)
408	{	905	{
409	if (w->is_abs)	906	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;	907	((WT)w)->at = mn_now + w->repeat;
413
414	assert (w->at > now);
415
416	downheap (timers, timercnt, 0);	908	downheap ((WT *)timers, timercnt, 0);
417	}	909	}
418	else	910	else
		911	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		912
		913	event (EV_A_ (W)w, EV_TIMEOUT);
		914	}
		915	}
		916
		917	static void
		918	periodics_reify (EV_P)
		919	{
		920	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		921	{
		922	struct ev_periodic *w = periodics [0];
		923
		924	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		925
		926	/* first reschedule or stop timer */
		927	if (w->interval)
419	{	928	{
420	evtimer_stop (w); /* nonrepeating: stop timer */	929	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
421	--timercnt; /* maybe pass by reference instead? */	930	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		931	downheap ((WT *)periodics, periodiccnt, 0);
422	}	932	}
		933	else
		934	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
423		935
424	event ((struct ev_watcher *)w, EV_TIMEOUT);	936	event (EV_A_ (W)w, EV_PERIODIC);
425	}	937	}
426	}	938	}
427		939
428	static void	940	static void
429	time_update ()	941	periodics_reschedule (EV_P)
430	{	942	{
431	int i;	943	int i;
432	ev_now = ev_time ();
433		944
434	if (have_monotonic)	945	/* adjust periodics after time jump */
		946	for (i = 0; i < periodiccnt; ++i)
435	{	947	{
436	ev_tstamp odiff = diff;	948	struct ev_periodic *w = periodics [i];
437		949
438	/* detecting time jumps is much more difficult */	950	if (w->interval)
439	for (i = 2; --i; ) /* loop a few times, before making important decisions */
440	{	951	{
441	now = get_clock ();	952	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
442	diff = ev_now - now;
443		953
444	if (fabs (odiff - diff) < MIN_TIMEJUMP)	954	if (fabs (diff) >= 1e-4)
445	return; /* all is well */	955	{
		956	ev_periodic_stop (EV_A_ w);
		957	ev_periodic_start (EV_A_ w);
446		958
447	ev_now = ev_time ();	959	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		960	}
448	}	961	}
		962	}
		963	}
449		964
450	/* time jump detected, reschedule atimers */	965	inline int
451	for (i = 0; i < atimercnt; ++i)	966	time_update_monotonic (EV_P)
		967	{
		968	mn_now = get_clock ();
		969
		970	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		971	{
		972	rt_now = rtmn_diff + mn_now;
		973	return 0;
		974	}
		975	else
		976	{
		977	now_floor = mn_now;
		978	rt_now = ev_time ();
		979	return 1;
		980	}
		981	}
		982
		983	static void
		984	time_update (EV_P)
		985	{
		986	int i;
		987
		988	#if EV_USE_MONOTONIC
		989	if (expect_true (have_monotonic))
		990	{
		991	if (time_update_monotonic (EV_A))
452	{	992	{
453	struct ev_timer *w = atimers [i];	993	ev_tstamp odiff = rtmn_diff;
454	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	994
		995	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		996	{
		997	rtmn_diff = rt_now - mn_now;
		998
		999	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1000	return; /* all is well */
		1001
		1002	rt_now = ev_time ();
		1003	mn_now = get_clock ();
		1004	now_floor = mn_now;
		1005	}
		1006
		1007	periodics_reschedule (EV_A);
		1008	/* no timer adjustment, as the monotonic clock doesn't jump */
		1009	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
455	}	1010	}
456	}	1011	}
457	else	1012	else
		1013	#endif
458	{	1014	{
459	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1015	rt_now = ev_time ();
460	/* time jump detected, adjust rtimers */	1016
		1017	if (expect_false (mn_now > rt_now \|\| mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1018	{
		1019	periodics_reschedule (EV_A);
		1020
		1021	/* adjust timers. this is easy, as the offset is the same for all */
461	for (i = 0; i < rtimercnt; ++i)	1022	for (i = 0; i < timercnt; ++i)
462	rtimers [i]->at += ev_now - now;	1023	((WT)timers [i])->at += rt_now - mn_now;
		1024	}
463		1025
464	now = ev_now;	1026	mn_now = rt_now;
465	}	1027	}
466	}	1028	}
467		1029
468	int ev_loop_done;	1030	void
		1031	ev_ref (EV_P)
		1032	{
		1033	++activecnt;
		1034	}
469		1035
		1036	void
		1037	ev_unref (EV_P)
		1038	{
		1039	--activecnt;
		1040	}
		1041
		1042	static int loop_done;
		1043
		1044	void
470	void ev_loop (int flags)	1045	ev_loop (EV_P_ int flags)
471	{	1046	{
472	double block;	1047	double block;
473	ev_loop_done = flags & EVLOOP_ONESHOT;	1048	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
474		1049
475	do	1050	do
476	{	1051	{
477	hook_call (EVHOOK_PREPOLL);	1052	/* queue check watchers (and execute them) */
		1053	if (expect_false (preparecnt))
		1054	{
		1055	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1056	call_pending (EV_A);
		1057	}
		1058
		1059	/* we might have forked, so reify kernel state if necessary */
		1060	if (expect_false (postfork))
		1061	loop_fork (EV_A);
478		1062
479	/* update fd-related kernel structures */	1063	/* update fd-related kernel structures */
480	fd_reify ();	1064	fd_reify (EV_A);
481		1065
482	/* calculate blocking time */	1066	/* calculate blocking time */
		1067
		1068	/* we only need this for !monotonic clockor timers, but as we basically
		1069	always have timers, we just calculate it always */
		1070	#if EV_USE_MONOTONIC
		1071	if (expect_true (have_monotonic))
		1072	time_update_monotonic (EV_A);
		1073	else
		1074	#endif
		1075	{
		1076	rt_now = ev_time ();
		1077	mn_now = rt_now;
		1078	}
		1079
483	if (flags & EVLOOP_NONBLOCK)	1080	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
484	block = 0.;	1081	block = 0.;
485	else	1082	else
486	{	1083	{
487	block = MAX_BLOCKTIME;	1084	block = MAX_BLOCKTIME;
488		1085
489	if (rtimercnt)	1086	if (timercnt)
490	{	1087	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1088	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
492	if (block > to) block = to;	1089	if (block > to) block = to;
493	}	1090	}
494		1091
495	if (atimercnt)	1092	if (periodiccnt)
496	{	1093	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1094	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
498	if (block > to) block = to;	1095	if (block > to) block = to;
499	}	1096	}
500		1097
501	if (block < 0.) block = 0.;	1098	if (block < 0.) block = 0.;
502	}	1099	}
503		1100
504	method_poll (block);	1101	method_poll (EV_A_ block);
505		1102
506	/* update ev_now, do magic */	1103	/* update rt_now, do magic */
507	time_update ();	1104	time_update (EV_A);
508		1105
509	hook_call (EVHOOK_POSTPOLL);
510
511	/* put pending timers into pendign queue and reschedule them */	1106	/* queue pending timers and reschedule them */
512	/* absolute timers first */	1107	timers_reify (EV_A); /* relative timers called last */
513	timers_reify (atimers, atimercnt, ev_now);	1108	periodics_reify (EV_A); /* absolute timers called first */
514	/* relative timers second */
515	timers_reify (rtimers, rtimercnt, now);
516		1109
		1110	/* queue idle watchers unless io or timers are pending */
		1111	if (!pendingcnt)
		1112	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1113
		1114	/* queue check watchers, to be executed first */
		1115	if (checkcnt)
		1116	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1117
517	call_pending ();	1118	call_pending (EV_A);
518	}	1119	}
519	while (!ev_loop_done);	1120	while (activecnt && !loop_done);
		1121
		1122	if (loop_done != 2)
		1123	loop_done = 0;
		1124	}
		1125
		1126	void
		1127	ev_unloop (EV_P_ int how)
		1128	{
		1129	loop_done = how;
520	}	1130	}
521		1131
522	/*****************************************************************************/	1132	/*****************************************************************************/
523		1133
524	static void	1134	inline void
525	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	1135	wlist_add (WL *head, WL elem)
526	{	1136	{
527	elem->next = *head;	1137	elem->next = *head;
528	*head = elem;	1138	*head = elem;
529	}	1139	}
530		1140
531	static void	1141	inline void
532	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	1142	wlist_del (WL *head, WL elem)
533	{	1143	{
534	while (*head)	1144	while (*head)
535	{	1145	{
536	if (*head == elem)	1146	if (*head == elem)
537	{	1147	{
541		1151
542	head = &(*head)->next;	1152	head = &(*head)->next;
543	}	1153	}
544	}	1154	}
545		1155
546	static void	1156	inline void
547	ev_start (struct ev_watcher *w, int active)	1157	ev_clear_pending (EV_P_ W w)
548	{	1158	{
		1159	if (w->pending)
		1160	{
		1161	pendings [ABSPRI (w)][w->pending - 1].w = 0;
549	w->pending = 0;	1162	w->pending = 0;
		1163	}
		1164	}
		1165
		1166	inline void
		1167	ev_start (EV_P_ W w, int active)
		1168	{
		1169	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1170	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1171
550	w->active = active;	1172	w->active = active;
		1173	ev_ref (EV_A);
551	}	1174	}
552		1175
553	static void	1176	inline void
554	ev_stop (struct ev_watcher *w)	1177	ev_stop (EV_P_ W w)
555	{	1178	{
556	if (w->pending)	1179	ev_unref (EV_A);
557	pendings [w->pending - 1].w = 0;
558
559	w->active = 0;	1180	w->active = 0;
560	/* nop */
561	}	1181	}
562		1182
563	/*****************************************************************************/	1183	/*****************************************************************************/
564		1184
565	void	1185	void
566	evio_start (struct ev_io *w)	1186	ev_io_start (EV_P_ struct ev_io *w)
567	{	1187	{
		1188	int fd = w->fd;
		1189
568	if (ev_is_active (w))	1190	if (ev_is_active (w))
569	return;	1191	return;
570		1192
571	int fd = w->fd;	1193	assert (("ev_io_start called with negative fd", fd >= 0));
572		1194
573	ev_start ((struct ev_watcher *)w, 1);	1195	ev_start (EV_A_ (W)w, 1);
574	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1196	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
575	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	1197	wlist_add ((WL *)&anfds[fd].head, (WL)w);
576		1198
577	++fdchangecnt;	1199	fd_change (EV_A_ fd);
578	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
579	fdchanges [fdchangecnt - 1] = fd;
580	}	1200	}
581		1201
582	void	1202	void
583	evio_stop (struct ev_io *w)	1203	ev_io_stop (EV_P_ struct ev_io *w)
584	{	1204	{
		1205	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1206	if (!ev_is_active (w))
586	return;	1207	return;
587		1208
588	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	1209	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
589	ev_stop ((struct ev_watcher *)w);	1210	ev_stop (EV_A_ (W)w);
590		1211
591	++fdchangecnt;	1212	fd_change (EV_A_ w->fd);
592	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
593	fdchanges [fdchangecnt - 1] = w->fd;
594	}	1213	}
595		1214
596	void	1215	void
597	evtimer_start (struct ev_timer *w)	1216	ev_timer_start (EV_P_ struct ev_timer *w)
598	{	1217	{
599	if (ev_is_active (w))	1218	if (ev_is_active (w))
600	return;	1219	return;
601		1220
602	if (w->is_abs)	1221	((WT)w)->at += mn_now;
		1222
		1223	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1224
		1225	ev_start (EV_A_ (W)w, ++timercnt);
		1226	array_needsize (timers, timermax, timercnt, );
		1227	timers [timercnt - 1] = w;
		1228	upheap ((WT *)timers, timercnt - 1);
		1229
		1230	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1231	}
		1232
		1233	void
		1234	ev_timer_stop (EV_P_ struct ev_timer *w)
		1235	{
		1236	ev_clear_pending (EV_A_ (W)w);
		1237	if (!ev_is_active (w))
		1238	return;
		1239
		1240	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1241
		1242	if (((W)w)->active < timercnt--)
		1243	{
		1244	timers [((W)w)->active - 1] = timers [timercnt];
		1245	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
603	{	1246	}
604	/* this formula differs from the one in timer_reify becuse we do not round up */	1247
		1248	((WT)w)->at = w->repeat;
		1249
		1250	ev_stop (EV_A_ (W)w);
		1251	}
		1252
		1253	void
		1254	ev_timer_again (EV_P_ struct ev_timer *w)
		1255	{
		1256	if (ev_is_active (w))
		1257	{
605	if (w->repeat)	1258	if (w->repeat)
606	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1259	{
607		1260	((WT)w)->at = mn_now + w->repeat;
608	ev_start ((struct ev_watcher *)w, ++atimercnt);	1261	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
609	array_needsize (atimers, atimermax, atimercnt, );	1262	}
610	atimers [atimercnt - 1] = w;
611	upheap (atimers, atimercnt - 1);
612	}
613	else	1263	else
		1264	ev_timer_stop (EV_A_ w);
614	{	1265	}
615	w->at += now;	1266	else if (w->repeat)
616		1267	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	}	1268	}
624		1269
625	void	1270	void
626	evtimer_stop (struct ev_timer *w)	1271	ev_periodic_start (EV_P_ struct ev_periodic *w)
627	{	1272	{
		1273	if (ev_is_active (w))
		1274	return;
		1275
		1276	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1277
		1278	/* this formula differs from the one in periodic_reify because we do not always round up */
		1279	if (w->interval)
		1280	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1281
		1282	ev_start (EV_A_ (W)w, ++periodiccnt);
		1283	array_needsize (periodics, periodicmax, periodiccnt, );
		1284	periodics [periodiccnt - 1] = w;
		1285	upheap ((WT *)periodics, periodiccnt - 1);
		1286
		1287	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1288	}
		1289
		1290	void
		1291	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1292	{
		1293	ev_clear_pending (EV_A_ (W)w);
628	if (!ev_is_active (w))	1294	if (!ev_is_active (w))
629	return;	1295	return;
630		1296
631	if (w->is_abs)	1297	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
632	{	1298
633	if (w->active < atimercnt--)	1299	if (((W)w)->active < periodiccnt--)
634	{
635	atimers [w->active - 1] = atimers [atimercnt];
636	downheap (atimers, atimercnt, w->active - 1);
637	}
638	}	1300	{
639	else	1301	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1302	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
640	{	1303	}
641	if (w->active < rtimercnt--)
642	{
643	rtimers [w->active - 1] = rtimers [rtimercnt];
644	downheap (rtimers, rtimercnt, w->active - 1);
645	}
646	}
647		1304
648	ev_stop ((struct ev_watcher *)w);	1305	ev_stop (EV_A_ (W)w);
649	}	1306	}
650		1307
651	void	1308	void
652	evsignal_start (struct ev_signal *w)	1309	ev_idle_start (EV_P_ struct ev_idle *w)
653	{	1310	{
654	if (ev_is_active (w))	1311	if (ev_is_active (w))
655	return;	1312	return;
656		1313
657	ev_start ((struct ev_watcher *)w, 1);	1314	ev_start (EV_A_ (W)w, ++idlecnt);
		1315	array_needsize (idles, idlemax, idlecnt, );
		1316	idles [idlecnt - 1] = w;
		1317	}
		1318
		1319	void
		1320	ev_idle_stop (EV_P_ struct ev_idle *w)
		1321	{
		1322	ev_clear_pending (EV_A_ (W)w);
		1323	if (ev_is_active (w))
		1324	return;
		1325
		1326	idles [((W)w)->active - 1] = idles [--idlecnt];
		1327	ev_stop (EV_A_ (W)w);
		1328	}
		1329
		1330	void
		1331	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1332	{
		1333	if (ev_is_active (w))
		1334	return;
		1335
		1336	ev_start (EV_A_ (W)w, ++preparecnt);
		1337	array_needsize (prepares, preparemax, preparecnt, );
		1338	prepares [preparecnt - 1] = w;
		1339	}
		1340
		1341	void
		1342	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1343	{
		1344	ev_clear_pending (EV_A_ (W)w);
		1345	if (ev_is_active (w))
		1346	return;
		1347
		1348	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1349	ev_stop (EV_A_ (W)w);
		1350	}
		1351
		1352	void
		1353	ev_check_start (EV_P_ struct ev_check *w)
		1354	{
		1355	if (ev_is_active (w))
		1356	return;
		1357
		1358	ev_start (EV_A_ (W)w, ++checkcnt);
		1359	array_needsize (checks, checkmax, checkcnt, );
		1360	checks [checkcnt - 1] = w;
		1361	}
		1362
		1363	void
		1364	ev_check_stop (EV_P_ struct ev_check *w)
		1365	{
		1366	ev_clear_pending (EV_A_ (W)w);
		1367	if (ev_is_active (w))
		1368	return;
		1369
		1370	checks [((W)w)->active - 1] = checks [--checkcnt];
		1371	ev_stop (EV_A_ (W)w);
		1372	}
		1373
		1374	#ifndef SA_RESTART
		1375	# define SA_RESTART 0
		1376	#endif
		1377
		1378	void
		1379	ev_signal_start (EV_P_ struct ev_signal *w)
		1380	{
		1381	#if EV_MULTIPLICITY
		1382	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1383	#endif
		1384	if (ev_is_active (w))
		1385	return;
		1386
		1387	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1388
		1389	ev_start (EV_A_ (W)w, 1);
658	array_needsize (signals, signalmax, w->signum, signals_init);	1390	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);	1391	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
660		1392
661	if (!w->next)	1393	if (!((WL)w)->next)
662	{	1394	{
		1395	#if WIN32
		1396	signal (w->signum, sighandler);
		1397	#else
663	struct sigaction sa;	1398	struct sigaction sa;
664	sa.sa_handler = sighandler;	1399	sa.sa_handler = sighandler;
665	sigfillset (&sa.sa_mask);	1400	sigfillset (&sa.sa_mask);
666	sa.sa_flags = 0;	1401	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
667	sigaction (w->signum, &sa, 0);	1402	sigaction (w->signum, &sa, 0);
		1403	#endif
668	}	1404	}
669	}	1405	}
670		1406
671	void	1407	void
672	evsignal_stop (struct ev_signal *w)	1408	ev_signal_stop (EV_P_ struct ev_signal *w)
673	{	1409	{
		1410	ev_clear_pending (EV_A_ (W)w);
674	if (!ev_is_active (w))	1411	if (!ev_is_active (w))
675	return;	1412	return;
676		1413
677	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	1414	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
678	ev_stop ((struct ev_watcher *)w);	1415	ev_stop (EV_A_ (W)w);
679		1416
680	if (!signals [w->signum - 1].head)	1417	if (!signals [w->signum - 1].head)
681	signal (w->signum, SIG_DFL);	1418	signal (w->signum, SIG_DFL);
682	}	1419	}
683		1420
		1421	void
		1422	ev_child_start (EV_P_ struct ev_child *w)
		1423	{
		1424	#if EV_MULTIPLICITY
		1425	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1426	#endif
		1427	if (ev_is_active (w))
		1428	return;
		1429
		1430	ev_start (EV_A_ (W)w, 1);
		1431	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1432	}
		1433
		1434	void
		1435	ev_child_stop (EV_P_ struct ev_child *w)
		1436	{
		1437	ev_clear_pending (EV_A_ (W)w);
		1438	if (ev_is_active (w))
		1439	return;
		1440
		1441	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1442	ev_stop (EV_A_ (W)w);
		1443	}
		1444
684	/*****************************************************************************/	1445	/*****************************************************************************/
685	#if 1
686		1446
687	static void	1447	struct ev_once
688	sin_cb (struct ev_io *w, int revents)
689	{	1448	{
690	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
691	}
692
693	static void
694	ocb (struct ev_timer *w, int revents)
695	{
696	//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);
698	evtimer_start (w);
699	}
700
701	static void
702	scb (struct ev_signal *w, int revents)
703	{
704	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
705	}
706
707	int main (void)
708	{
709	struct ev_io sin;	1449	struct ev_io io;
710
711	ev_init (0);
712
713	evw_init (&sin, sin_cb, 55);
714	evio_set (&sin, 0, EV_READ);
715	evio_start (&sin);
716
717	struct ev_timer t[10000];
718
719	#if 1
720	int i;
721	for (i = 0; i < 10000; ++i)
722	{
723	struct ev_timer *w = t + i;
724	evw_init (w, ocb, i);
725	evtimer_set_abs (w, drand48 (), 0.99775533);
726	evtimer_start (w);
727	if (drand48 () < 0.5)
728	evtimer_stop (w);
729	}
730	#endif
731
732	struct ev_timer t1;	1450	struct ev_timer to;
733	evw_init (&t1, ocb, 0);	1451	void (cb)(int revents, void arg);
734	evtimer_set_abs (&t1, 5, 10);	1452	void *arg;
735	evtimer_start (&t1);	1453	};
736		1454
737	struct ev_signal sig;	1455	static void
738	evw_init (&sig, scb, 65535);	1456	once_cb (EV_P_ struct ev_once *once, int revents)
739	evsignal_set (&sig, SIGQUIT);	1457	{
740	evsignal_start (&sig);	1458	void (cb)(int revents, void arg) = once->cb;
		1459	void *arg = once->arg;
741		1460
742	ev_loop (0);	1461	ev_io_stop (EV_A_ &once->io);
		1462	ev_timer_stop (EV_A_ &once->to);
		1463	ev_free (once);
743		1464
744	return 0;	1465	cb (revents, arg);
745	}	1466	}
746		1467
747	#endif	1468	static void
		1469	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1470	{
		1471	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1472	}
748		1473
		1474	static void
		1475	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1476	{
		1477	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1478	}
749		1479
		1480	void
		1481	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1482	{
		1483	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
750		1484
		1485	if (!once)
		1486	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1487	else
		1488	{
		1489	once->cb = cb;
		1490	once->arg = arg;
751		1491
		1492	ev_watcher_init (&once->io, once_cb_io);
		1493	if (fd >= 0)
		1494	{
		1495	ev_io_set (&once->io, fd, events);
		1496	ev_io_start (EV_A_ &once->io);
		1497	}
		1498
		1499	ev_watcher_init (&once->to, once_cb_to);
		1500	if (timeout >= 0.)
		1501	{
		1502	ev_timer_set (&once->to, timeout, 0.);
		1503	ev_timer_start (EV_A_ &once->to);
		1504	}
		1505	}
		1506	}
		1507

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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 1.70 by root, Tue Nov 6 00:52:32 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.8 by root, Wed Oct 31 00:32:33 2007 UTC vs.
Revision 1.70 by root, Tue Nov 6 00:52:32 2007 UTC