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Comparing libev/ev.c (file contents):
Revision 1.18 by root, Wed Oct 31 16:29:52 2007 UTC vs.
Revision 1.82 by root, Fri Nov 9 20:55:09 2007 UTC

1	/*	1	/*
		2	* libev event processing core, watcher management
		3	*
2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>	4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3	* All rights reserved.	5	* All rights reserved.
4	*	6	*
5	* Redistribution and use in source and binary forms, with or without	7	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions are	8	* modification, are permitted provided that the following conditions are
…		…
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE	28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	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
29		56
30	#include <math.h>	57	#include <math.h>
31	#include <stdlib.h>	58	#include <stdlib.h>
32	#include <unistd.h>
33	#include <fcntl.h>	59	#include <fcntl.h>
34	#include <signal.h>
35	#include <stddef.h>	60	#include <stddef.h>
36		61
37	#include <stdio.h>	62	#include <stdio.h>
38		63
39	#include <assert.h>	64	#include <assert.h>
40	#include <errno.h>	65	#include <errno.h>
41	#include <sys/time.h>	66	#include <sys/types.h>
42	#include <time.h>	67	#include <time.h>
43		68
44	#define HAVE_EPOLL 1	69	#include <signal.h>
45		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
46	#ifndef HAVE_MONOTONIC	78	#ifndef EV_USE_MONOTONIC
47	# ifdef CLOCK_MONOTONIC
48	# define HAVE_MONOTONIC 1	79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
49	# endif	105	# endif
50	#endif	106	#endif
51		107
52	#ifndef HAVE_SELECT
53	# define HAVE_SELECT 1
54	#endif
55
56	#ifndef HAVE_EPOLL
57	# define HAVE_EPOLL 0
58	#endif
59
60	#ifndef HAVE_REALTIME	108	#ifndef EV_USE_REALTIME
61	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	109	# define EV_USE_REALTIME 1
62	#endif	110	#endif
		111
		112	/**/
		113
		114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
		116	# define EV_USE_MONOTONIC 0
		117	#endif
		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
		121	# define EV_USE_REALTIME 0
		122	#endif
		123
		124	/**/
63		125
64	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
65	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
66		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
67	#include "ev.h"	134	# include "ev.h"
		135	#endif
		136
		137	#if __GNUC__ >= 3
		138	# define expect(expr,value) __builtin_expect ((expr),(value))
		139	# define inline inline
		140	#else
		141	# define expect(expr,value) (expr)
		142	# define inline static
		143	#endif
		144
		145	#define expect_false(expr) expect ((expr) != 0, 0)
		146	#define expect_true(expr) expect ((expr) != 0, 1)
		147
		148	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		149	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
68		150
69	typedef struct ev_watcher *W;	151	typedef struct ev_watcher *W;
70	typedef struct ev_watcher_list *WL;	152	typedef struct ev_watcher_list *WL;
71	typedef struct ev_watcher_time *WT;	153	typedef struct ev_watcher_time *WT;
72		154
73	static ev_tstamp now, diff; /* monotonic clock */	155	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
74	ev_tstamp ev_now;
75	int ev_method;
76		156
77	static int have_monotonic; /* runtime */	157	#include "ev_win32.c"
78
79	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
80	static void (*method_modify)(int fd, int oev, int nev);
81	static void (*method_poll)(ev_tstamp timeout);
82		158
83	/*****************************************************************************/	159	/*****************************************************************************/
84		160
85	ev_tstamp	161	static void (*syserr_cb)(const char *msg);
		162
		163	void ev_set_syserr_cb (void (*cb)(const char *msg))
		164	{
		165	syserr_cb = cb;
		166	}
		167
		168	static void
		169	syserr (const char *msg)
		170	{
		171	if (!msg)
		172	msg = "(libev) system error";
		173
		174	if (syserr_cb)
		175	syserr_cb (msg);
		176	else
		177	{
		178	perror (msg);
		179	abort ();
		180	}
		181	}
		182
		183	static void *(*alloc)(void *ptr, long size);
		184
		185	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		186	{
		187	alloc = cb;
		188	}
		189
		190	static void *
		191	ev_realloc (void *ptr, long size)
		192	{
		193	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		194
		195	if (!ptr && size)
		196	{
		197	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		198	abort ();
		199	}
		200
		201	return ptr;
		202	}
		203
		204	#define ev_malloc(size) ev_realloc (0, (size))
		205	#define ev_free(ptr) ev_realloc ((ptr), 0)
		206
		207	/*****************************************************************************/
		208
		209	typedef struct
		210	{
		211	WL head;
		212	unsigned char events;
		213	unsigned char reify;
		214	} ANFD;
		215
		216	typedef struct
		217	{
		218	W w;
		219	int events;
		220	} ANPENDING;
		221
		222	#if EV_MULTIPLICITY
		223
		224	struct ev_loop
		225	{
		226	#define VAR(name,decl) decl;
		227	#include "ev_vars.h"
		228	#undef VAR
		229	};
		230	#include "ev_wrap.h"
		231
		232	struct ev_loop default_loop_struct;
		233	static struct ev_loop *default_loop;
		234
		235	#else
		236
		237	#define VAR(name,decl) static decl;
		238	#include "ev_vars.h"
		239	#undef VAR
		240
		241	static int default_loop;
		242
		243	#endif
		244
		245	/*****************************************************************************/
		246
		247	inline ev_tstamp
86	ev_time (void)	248	ev_time (void)
87	{	249	{
88	#if HAVE_REALTIME	250	#if EV_USE_REALTIME
89	struct timespec ts;	251	struct timespec ts;
90	clock_gettime (CLOCK_REALTIME, &ts);	252	clock_gettime (CLOCK_REALTIME, &ts);
91	return ts.tv_sec + ts.tv_nsec * 1e-9;	253	return ts.tv_sec + ts.tv_nsec * 1e-9;
92	#else	254	#else
93	struct timeval tv;	255	struct timeval tv;
94	gettimeofday (&tv, 0);	256	gettimeofday (&tv, 0);
95	return tv.tv_sec + tv.tv_usec * 1e-6;	257	return tv.tv_sec + tv.tv_usec * 1e-6;
96	#endif	258	#endif
97	}	259	}
98		260
99	static ev_tstamp	261	inline ev_tstamp
100	get_clock (void)	262	get_clock (void)
101	{	263	{
102	#if HAVE_MONOTONIC	264	#if EV_USE_MONOTONIC
103	if (have_monotonic)	265	if (expect_true (have_monotonic))
104	{	266	{
105	struct timespec ts;	267	struct timespec ts;
106	clock_gettime (CLOCK_MONOTONIC, &ts);	268	clock_gettime (CLOCK_MONOTONIC, &ts);
107	return ts.tv_sec + ts.tv_nsec * 1e-9;	269	return ts.tv_sec + ts.tv_nsec * 1e-9;
108	}	270	}
109	#endif	271	#endif
110		272
111	return ev_time ();	273	return ev_time ();
112	}	274	}
113		275
		276	ev_tstamp
		277	ev_now (EV_P)
		278	{
		279	return rt_now;
		280	}
		281
		282	#define array_roundsize(type,n) ((n) | 4 & ~3)
		283
114	#define array_needsize(base,cur,cnt,init) \	284	#define array_needsize(type,base,cur,cnt,init) \
115	if ((cnt) > cur) \	285	if (expect_false ((cnt) > cur)) \
116	{ \	286	{ \
117	int newcnt = cur ? cur << 1 : 16; \	287	int newcnt = cur; \
		288	do \
		289	{ \
		290	newcnt = array_roundsize (type, newcnt << 1); \
		291	} \
		292	while ((cnt) > newcnt); \
		293	\
118	base = realloc (base, sizeof (*base) * (newcnt)); \	294	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
119	init (base + cur, newcnt - cur); \	295	init (base + cur, newcnt - cur); \
120	cur = newcnt; \	296	cur = newcnt; \
121	}	297	}
		298
		299	#define array_slim(type,stem) \
		300	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		301	{ \
		302	stem ## max = array_roundsize (stem ## cnt >> 1); \
		303	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		304	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		305	}
		306
		307	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		308	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		309	#define array_free_microshit(stem) \
		310	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		311
		312	#define array_free(stem, idx) \
		313	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
122		314
123	/*****************************************************************************/	315	/*****************************************************************************/
124		316
125	typedef struct
126	{
127	struct ev_io *head;
128	unsigned char wev, rev; /* want, received event set */
129	} ANFD;
130
131	static ANFD *anfds;
132	static int anfdmax;
133
134	static int *fdchanges;
135	static int fdchangemax, fdchangecnt;
136
137	static void	317	static void
138	anfds_init (ANFD *base, int count)	318	anfds_init (ANFD *base, int count)
139	{	319	{
140	while (count--)	320	while (count--)
141	{	321	{
142	base->head = 0;	322	base->head = 0;
143	base->wev = base->rev = EV_NONE;	323	base->events = EV_NONE;
		324	base->reify = 0;
		325
144	++base;	326	++base;
145	}	327	}
146	}	328	}
147		329
148	typedef struct	330	void
		331	ev_feed_event (EV_P_ void *w, int revents)
149	{	332	{
150	W w;	333	W w_ = (W)w;
151	int events;
152	} ANPENDING;
153		334
154	static ANPENDING *pendings;	335	if (w_->pending)
155	static int pendingmax, pendingcnt;
156
157	static void
158	event (W w, int events)
159	{
160	if (w->active)
161	{	336	{
162	w->pending = ++pendingcnt;
163	array_needsize (pendings, pendingmax, pendingcnt, );
164	pendings [pendingcnt - 1].w = w;
165	pendings [pendingcnt - 1].events = events;	337	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		338	return;
166	}	339	}
167	}
168		340
		341	w_->pending = ++pendingcnt [ABSPRI (w_)];
		342	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
		343	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		344	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		345	}
		346
169	static void	347	static void
		348	queue_events (EV_P_ W *events, int eventcnt, int type)
		349	{
		350	int i;
		351
		352	for (i = 0; i < eventcnt; ++i)
		353	ev_feed_event (EV_A_ events [i], type);
		354	}
		355
		356	inline void
170	fd_event (int fd, int events)	357	fd_event (EV_P_ int fd, int revents)
171	{	358	{
172	ANFD *anfd = anfds + fd;	359	ANFD *anfd = anfds + fd;
173	struct ev_io *w;	360	struct ev_io *w;
174		361
175	for (w = anfd->head; w; w = w->next)	362	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
176	{	363	{
177	int ev = w->events & events;	364	int ev = w->events & revents;
178		365
179	if (ev)	366	if (ev)
180	event ((W)w, ev);	367	ev_feed_event (EV_A_ (W)w, ev);
181	}	368	}
182	}	369	}
183		370
		371	void
		372	ev_feed_fd_event (EV_P_ int fd, int revents)
		373	{
		374	fd_event (EV_A_ fd, revents);
		375	}
		376
		377	/*****************************************************************************/
		378
184	static void	379	static void
185	queue_events (W *events, int eventcnt, int type)	380	fd_reify (EV_P)
186	{	381	{
187	int i;	382	int i;
188		383
189	for (i = 0; i < eventcnt; ++i)	384	for (i = 0; i < fdchangecnt; ++i)
190	event (events [i], type);	385	{
		386	int fd = fdchanges [i];
		387	ANFD *anfd = anfds + fd;
		388	struct ev_io *w;
		389
		390	int events = 0;
		391
		392	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		393	events |= w->events;
		394
		395	anfd->reify = 0;
		396
		397	method_modify (EV_A_ fd, anfd->events, events);
		398	anfd->events = events;
		399	}
		400
		401	fdchangecnt = 0;
		402	}
		403
		404	static void
		405	fd_change (EV_P_ int fd)
		406	{
		407	if (anfds [fd].reify)
		408	return;
		409
		410	anfds [fd].reify = 1;
		411
		412	++fdchangecnt;
		413	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		414	fdchanges [fdchangecnt - 1] = fd;
		415	}
		416
		417	static void
		418	fd_kill (EV_P_ int fd)
		419	{
		420	struct ev_io *w;
		421
		422	while ((w = (struct ev_io *)anfds [fd].head))
		423	{
		424	ev_io_stop (EV_A_ w);
		425	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		426	}
		427	}
		428
		429	static int
		430	fd_valid (int fd)
		431	{
		432	#ifdef WIN32
		433	return !!win32_get_osfhandle (fd);
		434	#else
		435	return fcntl (fd, F_GETFD) != -1;
		436	#endif
		437	}
		438
		439	/* called on EBADF to verify fds */
		440	static void
		441	fd_ebadf (EV_P)
		442	{
		443	int fd;
		444
		445	for (fd = 0; fd < anfdmax; ++fd)
		446	if (anfds [fd].events)
		447	if (!fd_valid (fd) == -1 && errno == EBADF)
		448	fd_kill (EV_A_ fd);
		449	}
		450
		451	/* called on ENOMEM in select/poll to kill some fds and retry */
		452	static void
		453	fd_enomem (EV_P)
		454	{
		455	int fd;
		456
		457	for (fd = anfdmax; fd--; )
		458	if (anfds [fd].events)
		459	{
		460	fd_kill (EV_A_ fd);
		461	return;
		462	}
		463	}
		464
		465	/* usually called after fork if method needs to re-arm all fds from scratch */
		466	static void
		467	fd_rearm_all (EV_P)
		468	{
		469	int fd;
		470
		471	/* this should be highly optimised to not do anything but set a flag */
		472	for (fd = 0; fd < anfdmax; ++fd)
		473	if (anfds [fd].events)
		474	{
		475	anfds [fd].events = 0;
		476	fd_change (EV_A_ fd);
		477	}
191	}	478	}
192		479
193	/*****************************************************************************/	480	/*****************************************************************************/
194		481
195	static struct ev_timer **timers;
196	static int timermax, timercnt;
197
198	static struct ev_periodic **periodics;
199	static int periodicmax, periodiccnt;
200
201	static void	482	static void
202	upheap (WT *timers, int k)	483	upheap (WT *heap, int k)
203	{	484	{
204	WT w = timers [k];	485	WT w = heap [k];
205		486
206	while (k && timers [k >> 1]->at > w->at)	487	while (k && heap [k >> 1]->at > w->at)
207	{	488	{
208	timers [k] = timers [k >> 1];	489	heap [k] = heap [k >> 1];
209	timers [k]->active = k + 1;	490	((W)heap [k])->active = k + 1;
210	k >>= 1;	491	k >>= 1;
211	}	492	}
212		493
213	timers [k] = w;	494	heap [k] = w;
214	timers [k]->active = k + 1;	495	((W)heap [k])->active = k + 1;
215		496
216	}	497	}
217		498
218	static void	499	static void
219	downheap (WT *timers, int N, int k)	500	downheap (WT *heap, int N, int k)
220	{	501	{
221	WT w = timers [k];	502	WT w = heap [k];
222		503
223	while (k < (N >> 1))	504	while (k < (N >> 1))
224	{	505	{
225	int j = k << 1;	506	int j = k << 1;
226		507
227	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	508	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
228	++j;	509	++j;
229		510
230	if (w->at <= timers [j]->at)	511	if (w->at <= heap [j]->at)
231	break;	512	break;
232		513
233	timers [k] = timers [j];	514	heap [k] = heap [j];
234	timers [k]->active = k + 1;	515	((W)heap [k])->active = k + 1;
235	k = j;	516	k = j;
236	}	517	}
237		518
238	timers [k] = w;	519	heap [k] = w;
239	timers [k]->active = k + 1;	520	((W)heap [k])->active = k + 1;
240	}	521	}
241		522
242	/*****************************************************************************/	523	/*****************************************************************************/
243		524
244	typedef struct	525	typedef struct
245	{	526	{
246	struct ev_signal *head;	527	WL head;
247	sig_atomic_t gotsig;	528	sig_atomic_t volatile gotsig;
248	} ANSIG;	529	} ANSIG;
249		530
250	static ANSIG *signals;	531	static ANSIG *signals;
251	static int signalmax;	532	static int signalmax;
252		533
253	static int sigpipe [2];	534	static int sigpipe [2];
254	static sig_atomic_t gotsig;	535	static sig_atomic_t volatile gotsig;
255	static struct ev_io sigev;	536	static struct ev_io sigev;
256		537
257	static void	538	static void
258	signals_init (ANSIG *base, int count)	539	signals_init (ANSIG *base, int count)
259	{	540	{
260	while (count--)	541	while (count--)
261	{	542	{
262	base->head = 0;	543	base->head = 0;
263	base->gotsig = 0;	544	base->gotsig = 0;
		545
264	++base;	546	++base;
265	}	547	}
266	}	548	}
267		549
268	static void	550	static void
269	sighandler (int signum)	551	sighandler (int signum)
270	{	552	{
		553	#if WIN32
		554	signal (signum, sighandler);
		555	#endif
		556
271	signals [signum - 1].gotsig = 1;	557	signals [signum - 1].gotsig = 1;
272		558
273	if (!gotsig)	559	if (!gotsig)
274	{	560	{
		561	int old_errno = errno;
275	gotsig = 1;	562	gotsig = 1;
		563	#ifdef WIN32
		564	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		565	#else
276	write (sigpipe [1], &gotsig, 1);	566	write (sigpipe [1], &signum, 1);
		567	#endif
		568	errno = old_errno;
277	}	569	}
278	}	570	}
279		571
		572	void
		573	ev_feed_signal_event (EV_P_ int signum)
		574	{
		575	WL w;
		576
		577	#if EV_MULTIPLICITY
		578	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		579	#endif
		580
		581	--signum;
		582
		583	if (signum < 0 || signum >= signalmax)
		584	return;
		585
		586	signals [signum].gotsig = 0;
		587
		588	for (w = signals [signum].head; w; w = w->next)
		589	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		590	}
		591
280	static void	592	static void
281	sigcb (struct ev_io *iow, int revents)	593	sigcb (EV_P_ struct ev_io *iow, int revents)
282	{	594	{
283	struct ev_signal *w;
284	int sig;	595	int signum;
285		596
		597	#ifdef WIN32
		598	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		599	#else
		600	read (sigpipe [0], &revents, 1);
		601	#endif
286	gotsig = 0;	602	gotsig = 0;
287	read (sigpipe [0], &revents, 1);
288		603
289	for (sig = signalmax; sig--; )	604	for (signum = signalmax; signum--; )
290	if (signals [sig].gotsig)	605	if (signals [signum].gotsig)
291	{	606	ev_feed_signal_event (EV_A_ signum + 1);
292	signals [sig].gotsig = 0;
293
294	for (w = signals [sig].head; w; w = w->next)
295	event ((W)w, EV_SIGNAL);
296	}
297	}	607	}
298		608
299	static void	609	static void
300	siginit (void)	610	siginit (EV_P)
301	{	611	{
		612	#ifndef WIN32
302	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	613	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
303	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	614	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
304		615
305	/* rather than sort out wether we really need nb, set it */	616	/* rather than sort out wether we really need nb, set it */
306	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	617	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
307	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	618	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		619	#endif
308		620
309	evio_set (&sigev, sigpipe [0], EV_READ);	621	ev_io_set (&sigev, sigpipe [0], EV_READ);
310	evio_start (&sigev);	622	ev_io_start (EV_A_ &sigev);
		623	ev_unref (EV_A); /* child watcher should not keep loop alive */
311	}	624	}
312		625
313	/*****************************************************************************/	626	/*****************************************************************************/
314		627
315	static struct ev_idle **idles;	628	static struct ev_child *childs [PID_HASHSIZE];
316	static int idlemax, idlecnt;
317		629
318	static struct ev_check **checks;	630	#ifndef WIN32
319	static int checkmax, checkcnt;	631
		632	static struct ev_signal childev;
		633
		634	#ifndef WCONTINUED
		635	# define WCONTINUED 0
		636	#endif
		637
		638	static void
		639	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		640	{
		641	struct ev_child *w;
		642
		643	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		644	if (w->pid == pid || !w->pid)
		645	{
		646	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		647	w->rpid = pid;
		648	w->rstatus = status;
		649	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		650	}
		651	}
		652
		653	static void
		654	childcb (EV_P_ struct ev_signal *sw, int revents)
		655	{
		656	int pid, status;
		657
		658	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		659	{
		660	/* make sure we are called again until all childs have been reaped */
		661	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		662
		663	child_reap (EV_A_ sw, pid, pid, status);
		664	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		665	}
		666	}
		667
		668	#endif
320		669
321	/*****************************************************************************/	670	/*****************************************************************************/
322		671
		672	#if EV_USE_KQUEUE
		673	# include "ev_kqueue.c"
		674	#endif
323	#if HAVE_EPOLL	675	#if EV_USE_EPOLL
324	# include "ev_epoll.c"	676	# include "ev_epoll.c"
325	#endif	677	#endif
		678	#if EV_USE_POLL
		679	# include "ev_poll.c"
		680	#endif
326	#if HAVE_SELECT	681	#if EV_USE_SELECT
327	# include "ev_select.c"	682	# include "ev_select.c"
328	#endif	683	#endif
329		684
330	int ev_init (int flags)	685	int
		686	ev_version_major (void)
331	{	687	{
		688	return EV_VERSION_MAJOR;
		689	}
		690
		691	int
		692	ev_version_minor (void)
		693	{
		694	return EV_VERSION_MINOR;
		695	}
		696
		697	/* return true if we are running with elevated privileges and should ignore env variables */
		698	static int
		699	enable_secure (void)
		700	{
		701	#ifdef WIN32
		702	return 0;
		703	#else
		704	return getuid () != geteuid ()
		705	|| getgid () != getegid ();
		706	#endif
		707	}
		708
		709	int
		710	ev_method (EV_P)
		711	{
		712	return method;
		713	}
		714
		715	static void
		716	loop_init (EV_P_ int methods)
		717	{
		718	if (!method)
		719	{
332	#if HAVE_MONOTONIC	720	#if EV_USE_MONOTONIC
333	{	721	{
334	struct timespec ts;	722	struct timespec ts;
335	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	723	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
336	have_monotonic = 1;	724	have_monotonic = 1;
337	}	725	}
338	#endif	726	#endif
339		727
340	ev_now = ev_time ();	728	rt_now = ev_time ();
341	now = get_clock ();	729	mn_now = get_clock ();
342	diff = ev_now - now;	730	now_floor = mn_now;
		731	rtmn_diff = rt_now - mn_now;
343		732
		733	if (methods == EVMETHOD_AUTO)
		734	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		735	methods = atoi (getenv ("LIBEV_METHODS"));
		736	else
		737	methods = EVMETHOD_ANY;
		738
		739	method = 0;
		740	#if EV_USE_WIN32
		741	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		742	#endif
		743	#if EV_USE_KQUEUE
		744	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		745	#endif
		746	#if EV_USE_EPOLL
		747	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		748	#endif
		749	#if EV_USE_POLL
		750	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		751	#endif
		752	#if EV_USE_SELECT
		753	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		754	#endif
		755
		756	ev_watcher_init (&sigev, sigcb);
		757	ev_set_priority (&sigev, EV_MAXPRI);
		758	}
		759	}
		760
		761	void
		762	loop_destroy (EV_P)
		763	{
		764	int i;
		765
		766	#if EV_USE_WIN32
		767	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		768	#endif
		769	#if EV_USE_KQUEUE
		770	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		771	#endif
		772	#if EV_USE_EPOLL
		773	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		774	#endif
		775	#if EV_USE_POLL
		776	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		777	#endif
		778	#if EV_USE_SELECT
		779	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		780	#endif
		781
		782	for (i = NUMPRI; i--; )
		783	array_free (pending, [i]);
		784
		785	/* have to use the microsoft-never-gets-it-right macro */
		786	array_free_microshit (fdchange);
		787	array_free_microshit (timer);
		788	array_free_microshit (periodic);
		789	array_free_microshit (idle);
		790	array_free_microshit (prepare);
		791	array_free_microshit (check);
		792
		793	method = 0;
		794	}
		795
		796	static void
		797	loop_fork (EV_P)
		798	{
		799	#if EV_USE_EPOLL
		800	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		801	#endif
		802	#if EV_USE_KQUEUE
		803	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		804	#endif
		805
		806	if (ev_is_active (&sigev))
		807	{
		808	/* default loop */
		809
		810	ev_ref (EV_A);
		811	ev_io_stop (EV_A_ &sigev);
		812	close (sigpipe [0]);
		813	close (sigpipe [1]);
		814
		815	while (pipe (sigpipe))
		816	syserr ("(libev) error creating pipe");
		817
		818	siginit (EV_A);
		819	}
		820
		821	postfork = 0;
		822	}
		823
		824	#if EV_MULTIPLICITY
		825	struct ev_loop *
		826	ev_loop_new (int methods)
		827	{
		828	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		829
		830	memset (loop, 0, sizeof (struct ev_loop));
		831
		832	loop_init (EV_A_ methods);
		833
		834	if (ev_method (EV_A))
		835	return loop;
		836
		837	return 0;
		838	}
		839
		840	void
		841	ev_loop_destroy (EV_P)
		842	{
		843	loop_destroy (EV_A);
		844	ev_free (loop);
		845	}
		846
		847	void
		848	ev_loop_fork (EV_P)
		849	{
		850	postfork = 1;
		851	}
		852
		853	#endif
		854
		855	#if EV_MULTIPLICITY
		856	struct ev_loop *
		857	#else
		858	int
		859	#endif
		860	ev_default_loop (int methods)
		861	{
		862	if (sigpipe [0] == sigpipe [1])
344	if (pipe (sigpipe))	863	if (pipe (sigpipe))
345	return 0;	864	return 0;
346		865
347	ev_method = EVMETHOD_NONE;	866	if (!default_loop)
348	#if HAVE_EPOLL	867	{
349	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	868	#if EV_MULTIPLICITY
		869	struct ev_loop *loop = default_loop = &default_loop_struct;
		870	#else
		871	default_loop = 1;
350	#endif	872	#endif
351	#if HAVE_SELECT
352	if (ev_method == EVMETHOD_NONE) select_init (flags);
353	#endif
354		873
		874	loop_init (EV_A_ methods);
		875
		876	if (ev_method (EV_A))
		877	{
		878	siginit (EV_A);
		879
		880	#ifndef WIN32
		881	ev_signal_init (&childev, childcb, SIGCHLD);
		882	ev_set_priority (&childev, EV_MAXPRI);
		883	ev_signal_start (EV_A_ &childev);
		884	ev_unref (EV_A); /* child watcher should not keep loop alive */
		885	#endif
		886	}
		887	else
		888	default_loop = 0;
		889	}
		890
		891	return default_loop;
		892	}
		893
		894	void
		895	ev_default_destroy (void)
		896	{
		897	#if EV_MULTIPLICITY
		898	struct ev_loop *loop = default_loop;
		899	#endif
		900
		901	#ifndef WIN32
		902	ev_ref (EV_A); /* child watcher */
		903	ev_signal_stop (EV_A_ &childev);
		904	#endif
		905
		906	ev_ref (EV_A); /* signal watcher */
		907	ev_io_stop (EV_A_ &sigev);
		908
		909	close (sigpipe [0]); sigpipe [0] = 0;
		910	close (sigpipe [1]); sigpipe [1] = 0;
		911
		912	loop_destroy (EV_A);
		913	}
		914
		915	void
		916	ev_default_fork (void)
		917	{
		918	#if EV_MULTIPLICITY
		919	struct ev_loop *loop = default_loop;
		920	#endif
		921
355	if (ev_method)	922	if (method)
356	{	923	postfork = 1;
357	evw_init (&sigev, sigcb);
358	siginit ();
359	}
360
361	return ev_method;
362	}	924	}
363		925
364	/*****************************************************************************/	926	/*****************************************************************************/
365		927
366	void ev_prefork (void)
367	{
368	/* nop */
369	}
370
371	void ev_postfork_parent (void)
372	{
373	/* nop */
374	}
375
376	void ev_postfork_child (void)
377	{
378	#if HAVE_EPOLL
379	if (ev_method == EVMETHOD_EPOLL)
380	epoll_postfork_child ();
381	#endif
382
383	evio_stop (&sigev);
384	close (sigpipe [0]);
385	close (sigpipe [1]);
386	pipe (sigpipe);
387	siginit ();
388	}
389
390	/*****************************************************************************/
391
392	static void	928	static int
393	fd_reify (void)	929	any_pending (EV_P)
394	{	930	{
395	int i;	931	int pri;
396		932
397	for (i = 0; i < fdchangecnt; ++i)	933	for (pri = NUMPRI; pri--; )
398	{	934	if (pendingcnt [pri])
399	int fd = fdchanges [i];	935	return 1;
400	ANFD *anfd = anfds + fd;
401	struct ev_io *w;
402		936
403	int wev = 0;	937	return 0;
404
405	for (w = anfd->head; w; w = w->next)
406	wev |= w->events;
407
408	if (anfd->wev != wev)
409	{
410	method_modify (fd, anfd->wev, wev);
411	anfd->wev = wev;
412	}
413	}
414
415	fdchangecnt = 0;
416	}	938	}
417		939
418	static void	940	static void
419	call_pending ()	941	call_pending (EV_P)
420	{	942	{
		943	int pri;
		944
		945	for (pri = NUMPRI; pri--; )
421	while (pendingcnt)	946	while (pendingcnt [pri])
422	{	947	{
423	ANPENDING *p = pendings + --pendingcnt;	948	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
424		949
425	if (p->w)	950	if (p->w)
426	{	951	{
427	p->w->pending = 0;	952	p->w->pending = 0;
428	p->w->cb (p->w, p->events);	953	EV_CB_INVOKE (p->w, p->events);
429	}	954	}
430	}	955	}
431	}	956	}
432		957
433	static void	958	static void
434	timers_reify ()	959	timers_reify (EV_P)
435	{	960	{
436	while (timercnt && timers [0]->at <= now)	961	while (timercnt && ((WT)timers [0])->at <= mn_now)
437	{	962	{
438	struct ev_timer *w = timers [0];	963	struct ev_timer *w = timers [0];
439		964
440	event ((W)w, EV_TIMEOUT);	965	assert (("inactive timer on timer heap detected", ev_is_active (w)));
441		966
442	/* first reschedule or stop timer */	967	/* first reschedule or stop timer */
443	if (w->repeat)	968	if (w->repeat)
444	{	969	{
		970	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
445	w->at = now + w->repeat;	971	((WT)w)->at = mn_now + w->repeat;
446	assert (("timer timeout in the past, negative repeat?", w->at > now));
447	downheap ((WT *)timers, timercnt, 0);	972	downheap ((WT *)timers, timercnt, 0);
448	}	973	}
449	else	974	else
450	evtimer_stop (w); /* nonrepeating: stop timer */	975	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
451	}
452	}
453		976
		977	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		978	}
		979	}
		980
454	static void	981	static void
455	periodics_reify ()	982	periodics_reify (EV_P)
456	{	983	{
457	while (periodiccnt && periodics [0]->at <= ev_now)	984	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
458	{	985	{
459	struct ev_periodic *w = periodics [0];	986	struct ev_periodic *w = periodics [0];
460		987
		988	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		989
461	/* first reschedule or stop timer */	990	/* first reschedule or stop timer */
462	if (w->interval)	991	if (w->reschedule_cb)
463	{	992	{
		993	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
		994
		995	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		996	downheap ((WT *)periodics, periodiccnt, 0);
		997	}
		998	else if (w->interval)
		999	{
464	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1000	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
465	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1001	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
466	downheap ((WT *)periodics, periodiccnt, 0);	1002	downheap ((WT *)periodics, periodiccnt, 0);
467	}	1003	}
468	else	1004	else
469	evperiodic_stop (w); /* nonrepeating: stop timer */	1005	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
470		1006
471	event ((W)w, EV_TIMEOUT);	1007	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
472	}	1008	}
473	}	1009	}
474		1010
475	static void	1011	static void
476	periodics_reschedule (ev_tstamp diff)	1012	periodics_reschedule (EV_P)
477	{	1013	{
478	int i;	1014	int i;
479		1015
480	/* adjust periodics after time jump */	1016	/* adjust periodics after time jump */
481	for (i = 0; i < periodiccnt; ++i)	1017	for (i = 0; i < periodiccnt; ++i)
482	{	1018	{
483	struct ev_periodic *w = periodics [i];	1019	struct ev_periodic *w = periodics [i];
484		1020
		1021	if (w->reschedule_cb)
		1022	((WT)w)->at = w->reschedule_cb (w, rt_now);
485	if (w->interval)	1023	else if (w->interval)
		1024	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1025	}
		1026
		1027	/* now rebuild the heap */
		1028	for (i = periodiccnt >> 1; i--; )
		1029	downheap ((WT *)periodics, periodiccnt, i);
		1030	}
		1031
		1032	inline int
		1033	time_update_monotonic (EV_P)
		1034	{
		1035	mn_now = get_clock ();
		1036
		1037	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1038	{
		1039	rt_now = rtmn_diff + mn_now;
		1040	return 0;
		1041	}
		1042	else
		1043	{
		1044	now_floor = mn_now;
		1045	rt_now = ev_time ();
		1046	return 1;
		1047	}
		1048	}
		1049
		1050	static void
		1051	time_update (EV_P)
		1052	{
		1053	int i;
		1054
		1055	#if EV_USE_MONOTONIC
		1056	if (expect_true (have_monotonic))
		1057	{
		1058	if (time_update_monotonic (EV_A))
486	{	1059	{
487	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1060	ev_tstamp odiff = rtmn_diff;
488		1061
489	if (fabs (diff) >= 1e-4)	1062	for (i = 4; --i; ) /* loop a few times, before making important decisions */
490	{	1063	{
491	evperiodic_stop (w);	1064	rtmn_diff = rt_now - mn_now;
492	evperiodic_start (w);
493		1065
494	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1066	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1067	return; /* all is well */
		1068
		1069	rt_now = ev_time ();
		1070	mn_now = get_clock ();
		1071	now_floor = mn_now;
495	}	1072	}
		1073
		1074	periodics_reschedule (EV_A);
		1075	/* no timer adjustment, as the monotonic clock doesn't jump */
		1076	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
496	}	1077	}
497	}	1078	}
498	}	1079	else
499		1080	#endif
500	static void	1081	{
501	time_update ()
502	{
503	int i;
504
505	ev_now = ev_time ();	1082	rt_now = ev_time ();
506		1083
507	if (have_monotonic)	1084	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
508	{
509	ev_tstamp odiff = diff;
510
511	for (i = 4; --i; ) /* loop a few times, before making important decisions */
512	{	1085	{
513	now = get_clock ();
514	diff = ev_now - now;
515
516	if (fabs (odiff - diff) < MIN_TIMEJUMP)
517	return; /* all is well */
518
519	ev_now = ev_time ();
520	}
521
522	periodics_reschedule (diff - odiff);
523	/* no timer adjustment, as the monotonic clock doesn't jump */
524	}
525	else
526	{
527	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
528	{
529	periodics_reschedule (ev_now - now);	1086	periodics_reschedule (EV_A);
530		1087
531	/* adjust timers. this is easy, as the offset is the same for all */	1088	/* adjust timers. this is easy, as the offset is the same for all */
532	for (i = 0; i < timercnt; ++i)	1089	for (i = 0; i < timercnt; ++i)
533	timers [i]->at += diff;	1090	((WT)timers [i])->at += rt_now - mn_now;
534	}	1091	}
535		1092
536	now = ev_now;	1093	mn_now = rt_now;
537	}	1094	}
538	}	1095	}
539		1096
540	int ev_loop_done;	1097	void
		1098	ev_ref (EV_P)
		1099	{
		1100	++activecnt;
		1101	}
541		1102
		1103	void
		1104	ev_unref (EV_P)
		1105	{
		1106	--activecnt;
		1107	}
		1108
		1109	static int loop_done;
		1110
		1111	void
542	void ev_loop (int flags)	1112	ev_loop (EV_P_ int flags)
543	{	1113	{
544	double block;	1114	double block;
545	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1115	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
546
547	if (checkcnt)
548	{
549	queue_events ((W *)checks, checkcnt, EV_CHECK);
550	call_pending ();
551	}
552		1116
553	do	1117	do
554	{	1118	{
		1119	/* queue check watchers (and execute them) */
		1120	if (expect_false (preparecnt))
		1121	{
		1122	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1123	call_pending (EV_A);
		1124	}
		1125
		1126	/* we might have forked, so reify kernel state if necessary */
		1127	if (expect_false (postfork))
		1128	loop_fork (EV_A);
		1129
555	/* update fd-related kernel structures */	1130	/* update fd-related kernel structures */
556	fd_reify ();	1131	fd_reify (EV_A);
557		1132
558	/* calculate blocking time */	1133	/* calculate blocking time */
559		1134
560	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1135	/* we only need this for !monotonic clock or timers, but as we basically
		1136	always have timers, we just calculate it always */
		1137	#if EV_USE_MONOTONIC
		1138	if (expect_true (have_monotonic))
		1139	time_update_monotonic (EV_A);
		1140	else
		1141	#endif
		1142	{
561	ev_now = ev_time ();	1143	rt_now = ev_time ();
		1144	mn_now = rt_now;
		1145	}
562		1146
563	if (flags & EVLOOP_NONBLOCK || idlecnt)	1147	if (flags & EVLOOP_NONBLOCK || idlecnt)
564	block = 0.;	1148	block = 0.;
565	else	1149	else
566	{	1150	{
567	block = MAX_BLOCKTIME;	1151	block = MAX_BLOCKTIME;
568		1152
569	if (timercnt)	1153	if (timercnt)
570	{	1154	{
571	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1155	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
572	if (block > to) block = to;	1156	if (block > to) block = to;
573	}	1157	}
574		1158
575	if (periodiccnt)	1159	if (periodiccnt)
576	{	1160	{
577	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1161	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
578	if (block > to) block = to;	1162	if (block > to) block = to;
579	}	1163	}
580		1164
581	if (block < 0.) block = 0.;	1165	if (block < 0.) block = 0.;
582	}	1166	}
583		1167
584	method_poll (block);	1168	method_poll (EV_A_ block);
585		1169
586	/* update ev_now, do magic */	1170	/* update rt_now, do magic */
587	time_update ();	1171	time_update (EV_A);
588		1172
589	/* queue pending timers and reschedule them */	1173	/* queue pending timers and reschedule them */
		1174	timers_reify (EV_A); /* relative timers called last */
590	periodics_reify (); /* absolute timers first */	1175	periodics_reify (EV_A); /* absolute timers called first */
591	timers_reify (); /* relative timers second */
592		1176
593	/* queue idle watchers unless io or timers are pending */	1177	/* queue idle watchers unless io or timers are pending */
594	if (!pendingcnt)	1178	if (idlecnt && !any_pending (EV_A))
595	queue_events ((W *)idles, idlecnt, EV_IDLE);	1179	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
596		1180
597	/* queue check and possibly idle watchers */	1181	/* queue check watchers, to be executed first */
		1182	if (checkcnt)
598	queue_events ((W *)checks, checkcnt, EV_CHECK);	1183	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
599		1184
600	call_pending ();	1185	call_pending (EV_A);
601	}	1186	}
602	while (!ev_loop_done);	1187	while (activecnt && !loop_done);
603		1188
604	if (ev_loop_done != 2)	1189	if (loop_done != 2)
605	ev_loop_done = 0;	1190	loop_done = 0;
		1191	}
		1192
		1193	void
		1194	ev_unloop (EV_P_ int how)
		1195	{
		1196	loop_done = how;
606	}	1197	}
607		1198
608	/*****************************************************************************/	1199	/*****************************************************************************/
609		1200
610	static void	1201	inline void
611	wlist_add (WL *head, WL elem)	1202	wlist_add (WL *head, WL elem)
612	{	1203	{
613	elem->next = *head;	1204	elem->next = *head;
614	*head = elem;	1205	*head = elem;
615	}	1206	}
616		1207
617	static void	1208	inline void
618	wlist_del (WL *head, WL elem)	1209	wlist_del (WL *head, WL elem)
619	{	1210	{
620	while (*head)	1211	while (*head)
621	{	1212	{
622	if (*head == elem)	1213	if (*head == elem)
…		…
627		1218
628	head = &(*head)->next;	1219	head = &(*head)->next;
629	}	1220	}
630	}	1221	}
631		1222
632	static void	1223	inline void
633	ev_clear (W w)	1224	ev_clear_pending (EV_P_ W w)
634	{	1225	{
635	if (w->pending)	1226	if (w->pending)
636	{	1227	{
637	pendings [w->pending - 1].w = 0;	1228	pendings [ABSPRI (w)][w->pending - 1].w = 0;
638	w->pending = 0;	1229	w->pending = 0;
639	}	1230	}
640	}	1231	}
641		1232
642	static void	1233	inline void
643	ev_start (W w, int active)	1234	ev_start (EV_P_ W w, int active)
644	{	1235	{
		1236	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1237	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1238
645	w->active = active;	1239	w->active = active;
		1240	ev_ref (EV_A);
646	}	1241	}
647		1242
648	static void	1243	inline void
649	ev_stop (W w)	1244	ev_stop (EV_P_ W w)
650	{	1245	{
		1246	ev_unref (EV_A);
651	w->active = 0;	1247	w->active = 0;
652	}	1248	}
653		1249
654	/*****************************************************************************/	1250	/*****************************************************************************/
655		1251
656	void	1252	void
657	evio_start (struct ev_io *w)	1253	ev_io_start (EV_P_ struct ev_io *w)
658	{	1254	{
		1255	int fd = w->fd;
		1256
659	if (ev_is_active (w))	1257	if (ev_is_active (w))
660	return;	1258	return;
661		1259
662	int fd = w->fd;	1260	assert (("ev_io_start called with negative fd", fd >= 0));
663		1261
664	ev_start ((W)w, 1);	1262	ev_start (EV_A_ (W)w, 1);
665	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1263	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
666	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1264	wlist_add ((WL *)&anfds[fd].head, (WL)w);
667		1265
668	++fdchangecnt;	1266	fd_change (EV_A_ fd);
669	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
670	fdchanges [fdchangecnt - 1] = fd;
671	}	1267	}
672		1268
673	void	1269	void
674	evio_stop (struct ev_io *w)	1270	ev_io_stop (EV_P_ struct ev_io *w)
675	{	1271	{
676	ev_clear ((W)w);	1272	ev_clear_pending (EV_A_ (W)w);
677	if (!ev_is_active (w))	1273	if (!ev_is_active (w))
678	return;	1274	return;
679		1275
680	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1276	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
681	ev_stop ((W)w);	1277	ev_stop (EV_A_ (W)w);
682		1278
683	++fdchangecnt;	1279	fd_change (EV_A_ w->fd);
684	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
685	fdchanges [fdchangecnt - 1] = w->fd;
686	}	1280	}
687		1281
688	void	1282	void
689	evtimer_start (struct ev_timer *w)	1283	ev_timer_start (EV_P_ struct ev_timer *w)
690	{	1284	{
691	if (ev_is_active (w))	1285	if (ev_is_active (w))
692	return;	1286	return;
693		1287
694	w->at += now;	1288	((WT)w)->at += mn_now;
695		1289
696	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1290	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
697		1291
698	ev_start ((W)w, ++timercnt);	1292	ev_start (EV_A_ (W)w, ++timercnt);
699	array_needsize (timers, timermax, timercnt, );	1293	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
700	timers [timercnt - 1] = w;	1294	timers [timercnt - 1] = w;
701	upheap ((WT *)timers, timercnt - 1);	1295	upheap ((WT *)timers, timercnt - 1);
702	}
703		1296
		1297	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1298	}
		1299
704	void	1300	void
705	evtimer_stop (struct ev_timer *w)	1301	ev_timer_stop (EV_P_ struct ev_timer *w)
706	{	1302	{
707	ev_clear ((W)w);	1303	ev_clear_pending (EV_A_ (W)w);
708	if (!ev_is_active (w))	1304	if (!ev_is_active (w))
709	return;	1305	return;
710		1306
		1307	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1308
711	if (w->active < timercnt--)	1309	if (((W)w)->active < timercnt--)
712	{	1310	{
713	timers [w->active - 1] = timers [timercnt];	1311	timers [((W)w)->active - 1] = timers [timercnt];
714	downheap ((WT *)timers, timercnt, w->active - 1);	1312	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
715	}	1313	}
716		1314
717	w->at = w->repeat;	1315	((WT)w)->at = w->repeat;
718		1316
719	ev_stop ((W)w);	1317	ev_stop (EV_A_ (W)w);
720	}	1318	}
721		1319
722	void	1320	void
723	evtimer_again (struct ev_timer *w)	1321	ev_timer_again (EV_P_ struct ev_timer *w)
724	{	1322	{
725	if (ev_is_active (w))	1323	if (ev_is_active (w))
726	{	1324	{
727	if (w->repeat)	1325	if (w->repeat)
728	{	1326	{
729	w->at = now + w->repeat;	1327	((WT)w)->at = mn_now + w->repeat;
730	downheap ((WT *)timers, timercnt, w->active - 1);	1328	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
731	}	1329	}
732	else	1330	else
733	evtimer_stop (w);	1331	ev_timer_stop (EV_A_ w);
734	}	1332	}
735	else if (w->repeat)	1333	else if (w->repeat)
736	evtimer_start (w);	1334	ev_timer_start (EV_A_ w);
737	}	1335	}
738		1336
739	void	1337	void
740	evperiodic_start (struct ev_periodic *w)	1338	ev_periodic_start (EV_P_ struct ev_periodic *w)
741	{	1339	{
742	if (ev_is_active (w))	1340	if (ev_is_active (w))
743	return;	1341	return;
744		1342
745	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1343	if (w->reschedule_cb)
746		1344	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1345	else if (w->interval)
		1346	{
		1347	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
747	/* this formula differs from the one in periodic_reify because we do not always round up */	1348	/* this formula differs from the one in periodic_reify because we do not always round up */
748	if (w->interval)
749	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1349	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1350	}
750		1351
751	ev_start ((W)w, ++periodiccnt);	1352	ev_start (EV_A_ (W)w, ++periodiccnt);
752	array_needsize (periodics, periodicmax, periodiccnt, );	1353	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
753	periodics [periodiccnt - 1] = w;	1354	periodics [periodiccnt - 1] = w;
754	upheap ((WT *)periodics, periodiccnt - 1);	1355	upheap ((WT *)periodics, periodiccnt - 1);
755	}
756		1356
		1357	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1358	}
		1359
757	void	1360	void
758	evperiodic_stop (struct ev_periodic *w)	1361	ev_periodic_stop (EV_P_ struct ev_periodic *w)
759	{	1362	{
760	ev_clear ((W)w);	1363	ev_clear_pending (EV_A_ (W)w);
761	if (!ev_is_active (w))	1364	if (!ev_is_active (w))
762	return;	1365	return;
763		1366
		1367	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1368
764	if (w->active < periodiccnt--)	1369	if (((W)w)->active < periodiccnt--)
765	{	1370	{
766	periodics [w->active - 1] = periodics [periodiccnt];	1371	periodics [((W)w)->active - 1] = periodics [periodiccnt];
767	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1372	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
768	}	1373	}
769		1374
770	ev_stop ((W)w);	1375	ev_stop (EV_A_ (W)w);
771	}	1376	}
772		1377
773	void	1378	void
774	evsignal_start (struct ev_signal *w)	1379	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1380	{
		1381	ev_periodic_stop (EV_A_ w);
		1382	ev_periodic_start (EV_A_ w);
		1383	}
		1384
		1385	void
		1386	ev_idle_start (EV_P_ struct ev_idle *w)
775	{	1387	{
776	if (ev_is_active (w))	1388	if (ev_is_active (w))
777	return;	1389	return;
778		1390
		1391	ev_start (EV_A_ (W)w, ++idlecnt);
		1392	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1393	idles [idlecnt - 1] = w;
		1394	}
		1395
		1396	void
		1397	ev_idle_stop (EV_P_ struct ev_idle *w)
		1398	{
		1399	ev_clear_pending (EV_A_ (W)w);
		1400	if (ev_is_active (w))
		1401	return;
		1402
		1403	idles [((W)w)->active - 1] = idles [--idlecnt];
		1404	ev_stop (EV_A_ (W)w);
		1405	}
		1406
		1407	void
		1408	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1409	{
		1410	if (ev_is_active (w))
		1411	return;
		1412
		1413	ev_start (EV_A_ (W)w, ++preparecnt);
		1414	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1415	prepares [preparecnt - 1] = w;
		1416	}
		1417
		1418	void
		1419	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1420	{
		1421	ev_clear_pending (EV_A_ (W)w);
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1426	ev_stop (EV_A_ (W)w);
		1427	}
		1428
		1429	void
		1430	ev_check_start (EV_P_ struct ev_check *w)
		1431	{
		1432	if (ev_is_active (w))
		1433	return;
		1434
		1435	ev_start (EV_A_ (W)w, ++checkcnt);
		1436	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1437	checks [checkcnt - 1] = w;
		1438	}
		1439
		1440	void
		1441	ev_check_stop (EV_P_ struct ev_check *w)
		1442	{
		1443	ev_clear_pending (EV_A_ (W)w);
		1444	if (ev_is_active (w))
		1445	return;
		1446
		1447	checks [((W)w)->active - 1] = checks [--checkcnt];
		1448	ev_stop (EV_A_ (W)w);
		1449	}
		1450
		1451	#ifndef SA_RESTART
		1452	# define SA_RESTART 0
		1453	#endif
		1454
		1455	void
		1456	ev_signal_start (EV_P_ struct ev_signal *w)
		1457	{
		1458	#if EV_MULTIPLICITY
		1459	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1460	#endif
		1461	if (ev_is_active (w))
		1462	return;
		1463
		1464	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1465
779	ev_start ((W)w, 1);	1466	ev_start (EV_A_ (W)w, 1);
780	array_needsize (signals, signalmax, w->signum, signals_init);	1467	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
781	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1468	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
782		1469
783	if (!w->next)	1470	if (!((WL)w)->next)
784	{	1471	{
		1472	#if WIN32
		1473	signal (w->signum, sighandler);
		1474	#else
785	struct sigaction sa;	1475	struct sigaction sa;
786	sa.sa_handler = sighandler;	1476	sa.sa_handler = sighandler;
787	sigfillset (&sa.sa_mask);	1477	sigfillset (&sa.sa_mask);
788	sa.sa_flags = 0;	1478	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
789	sigaction (w->signum, &sa, 0);	1479	sigaction (w->signum, &sa, 0);
		1480	#endif
790	}	1481	}
791	}	1482	}
792		1483
793	void	1484	void
794	evsignal_stop (struct ev_signal *w)	1485	ev_signal_stop (EV_P_ struct ev_signal *w)
795	{	1486	{
796	ev_clear ((W)w);	1487	ev_clear_pending (EV_A_ (W)w);
797	if (!ev_is_active (w))	1488	if (!ev_is_active (w))
798	return;	1489	return;
799		1490
800	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1491	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
801	ev_stop ((W)w);	1492	ev_stop (EV_A_ (W)w);
802		1493
803	if (!signals [w->signum - 1].head)	1494	if (!signals [w->signum - 1].head)
804	signal (w->signum, SIG_DFL);	1495	signal (w->signum, SIG_DFL);
805	}	1496	}
806		1497
807	void evidle_start (struct ev_idle *w)	1498	void
		1499	ev_child_start (EV_P_ struct ev_child *w)
808	{	1500	{
		1501	#if EV_MULTIPLICITY
		1502	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1503	#endif
809	if (ev_is_active (w))	1504	if (ev_is_active (w))
810	return;	1505	return;
811		1506
812	ev_start ((W)w, ++idlecnt);	1507	ev_start (EV_A_ (W)w, 1);
813	array_needsize (idles, idlemax, idlecnt, );	1508	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
814	idles [idlecnt - 1] = w;
815	}	1509	}
816		1510
817	void evidle_stop (struct ev_idle *w)	1511	void
		1512	ev_child_stop (EV_P_ struct ev_child *w)
818	{	1513	{
819	ev_clear ((W)w);	1514	ev_clear_pending (EV_A_ (W)w);
820	if (ev_is_active (w))	1515	if (ev_is_active (w))
821	return;	1516	return;
822		1517
823	idles [w->active - 1] = idles [--idlecnt];	1518	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
824	ev_stop ((W)w);	1519	ev_stop (EV_A_ (W)w);
825	}
826
827	void evcheck_start (struct ev_check *w)
828	{
829	if (ev_is_active (w))
830	return;
831
832	ev_start ((W)w, ++checkcnt);
833	array_needsize (checks, checkmax, checkcnt, );
834	checks [checkcnt - 1] = w;
835	}
836
837	void evcheck_stop (struct ev_check *w)
838	{
839	ev_clear ((W)w);
840	if (ev_is_active (w))
841	return;
842
843	checks [w->active - 1] = checks [--checkcnt];
844	ev_stop ((W)w);
845	}	1520	}
846		1521
847	/*****************************************************************************/	1522	/*****************************************************************************/
848		1523
849	struct ev_once	1524	struct ev_once
…		…
853	void (*cb)(int revents, void *arg);	1528	void (*cb)(int revents, void *arg);
854	void *arg;	1529	void *arg;
855	};	1530	};
856		1531
857	static void	1532	static void
858	once_cb (struct ev_once *once, int revents)	1533	once_cb (EV_P_ struct ev_once *once, int revents)
859	{	1534	{
860	void (*cb)(int revents, void *arg) = once->cb;	1535	void (*cb)(int revents, void *arg) = once->cb;
861	void *arg = once->arg;	1536	void *arg = once->arg;
862		1537
863	evio_stop (&once->io);	1538	ev_io_stop (EV_A_ &once->io);
864	evtimer_stop (&once->to);	1539	ev_timer_stop (EV_A_ &once->to);
865	free (once);	1540	ev_free (once);
866		1541
867	cb (revents, arg);	1542	cb (revents, arg);
868	}	1543	}
869		1544
870	static void	1545	static void
871	once_cb_io (struct ev_io *w, int revents)	1546	once_cb_io (EV_P_ struct ev_io *w, int revents)
872	{	1547	{
873	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);	1548	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
874	}	1549	}
875		1550
876	static void	1551	static void
877	once_cb_to (struct ev_timer *w, int revents)	1552	once_cb_to (EV_P_ struct ev_timer *w, int revents)
878	{	1553	{
879	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);	1554	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
880	}	1555	}
881		1556
882	void	1557	void
883	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)	1558	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
884	{	1559	{
885	struct ev_once *once = malloc (sizeof (struct ev_once));	1560	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
886		1561
887	if (!once)	1562	if (!once)
888	cb (EV_ERROR, arg);	1563	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
889	else	1564	else
890	{	1565	{
891	once->cb = cb;	1566	once->cb = cb;
892	once->arg = arg;	1567	once->arg = arg;
893		1568
894	evw_init (&once->io, once_cb_io);	1569	ev_watcher_init (&once->io, once_cb_io);
895
896	if (fd >= 0)	1570	if (fd >= 0)
897	{	1571	{
898	evio_set (&once->io, fd, events);	1572	ev_io_set (&once->io, fd, events);
899	evio_start (&once->io);	1573	ev_io_start (EV_A_ &once->io);
900	}	1574	}
901		1575
902	evw_init (&once->to, once_cb_to);	1576	ev_watcher_init (&once->to, once_cb_to);
903
904	if (timeout >= 0.)	1577	if (timeout >= 0.)
905	{	1578	{
906	evtimer_set (&once->to, timeout, 0.);	1579	ev_timer_set (&once->to, timeout, 0.);
907	evtimer_start (&once->to);	1580	ev_timer_start (EV_A_ &once->to);
908	}	1581	}
909	}	1582	}
910	}	1583	}
911		1584
912	/*****************************************************************************/
913
914	#if 0
915
916	struct ev_io wio;
917
918	static void
919	sin_cb (struct ev_io *w, int revents)
920	{
921	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
922	}
923
924	static void
925	ocb (struct ev_timer *w, int revents)
926	{
927	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
928	evtimer_stop (w);
929	evtimer_start (w);
930	}
931
932	static void
933	scb (struct ev_signal *w, int revents)
934	{
935	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
936	evio_stop (&wio);
937	evio_start (&wio);
938	}
939
940	static void
941	gcb (struct ev_signal *w, int revents)
942	{
943	fprintf (stderr, "generic %x\n", revents);
944
945	}
946
947	int main (void)
948	{
949	ev_init (0);
950
951	evio_init (&wio, sin_cb, 0, EV_READ);
952	evio_start (&wio);
953
954	struct ev_timer t[10000];
955
956	#if 0
957	int i;
958	for (i = 0; i < 10000; ++i)
959	{
960	struct ev_timer *w = t + i;
961	evw_init (w, ocb, i);
962	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
963	evtimer_start (w);
964	if (drand48 () < 0.5)
965	evtimer_stop (w);
966	}
967	#endif
968
969	struct ev_timer t1;
970	evtimer_init (&t1, ocb, 5, 10);
971	evtimer_start (&t1);
972
973	struct ev_signal sig;
974	evsignal_init (&sig, scb, SIGQUIT);
975	evsignal_start (&sig);
976
977	struct ev_check cw;
978	evcheck_init (&cw, gcb);
979	evcheck_start (&cw);
980
981	struct ev_idle iw;
982	evidle_init (&iw, gcb);
983	evidle_start (&iw);
984
985	ev_loop (0);
986
987	return 0;
988	}
989
990	#endif
991
992
993
994

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