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Comparing libev/ev.c (file contents):
Revision 1.17 by root, Wed Oct 31 14:44:15 2007 UTC vs.
Revision 1.87 by root, Sat Nov 10 03:36:15 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
…		…
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	*/
29		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# define EV_USE_MONOTONIC 1
		41	# define EV_USE_REALTIME 1
		42	# endif
		43
		44	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		45	# define EV_USE_SELECT 1
		46	# endif
		47
		48	# if HAVE_POLL && HAVE_POLL_H
		49	# define EV_USE_POLL 1
		50	# endif
		51
		52	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		53	# define EV_USE_EPOLL 1
		54	# endif
		55
		56	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		57	# define EV_USE_KQUEUE 1
		58	# endif
		59
		60	#endif
		61
30	#include <math.h>	62	#include <math.h>
31	#include <stdlib.h>	63	#include <stdlib.h>
32	#include <unistd.h>
33	#include <fcntl.h>	64	#include <fcntl.h>
34	#include <signal.h>
35	#include <stddef.h>	65	#include <stddef.h>
36		66
37	#include <stdio.h>	67	#include <stdio.h>
38		68
39	#include <assert.h>	69	#include <assert.h>
40	#include <errno.h>	70	#include <errno.h>
41	#include <sys/time.h>	71	#include <sys/types.h>
42	#include <time.h>	72	#include <time.h>
43		73
44	#define HAVE_EPOLL 1	74	#include <signal.h>
45		75
		76	#ifndef WIN32
		77	# include <unistd.h>
		78	# include <sys/time.h>
		79	# include <sys/wait.h>
		80	#endif
		81	/**/
		82
46	#ifndef HAVE_MONOTONIC	83	#ifndef EV_USE_MONOTONIC
47	# ifdef CLOCK_MONOTONIC
48	# define HAVE_MONOTONIC 1	84	# define EV_USE_MONOTONIC 1
		85	#endif
		86
		87	#ifndef EV_USE_SELECT
		88	# define EV_USE_SELECT 1
		89	#endif
		90
		91	#ifndef EV_USE_POLL
		92	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		93	#endif
		94
		95	#ifndef EV_USE_EPOLL
		96	# define EV_USE_EPOLL 0
		97	#endif
		98
		99	#ifndef EV_USE_KQUEUE
		100	# define EV_USE_KQUEUE 0
		101	#endif
		102
		103	#ifndef EV_USE_WIN32
		104	# ifdef WIN32
		105	# define EV_USE_WIN32 0 /* it does not exist, use select */
		106	# undef EV_USE_SELECT
		107	# define EV_USE_SELECT 1
		108	# else
		109	# define EV_USE_WIN32 0
49	# endif	110	# endif
50	#endif	111	#endif
51		112
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	113	#ifndef EV_USE_REALTIME
61	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	114	# define EV_USE_REALTIME 1
62	#endif	115	#endif
		116
		117	/**/
		118
		119	#ifndef CLOCK_MONOTONIC
		120	# undef EV_USE_MONOTONIC
		121	# define EV_USE_MONOTONIC 0
		122	#endif
		123
		124	#ifndef CLOCK_REALTIME
		125	# undef EV_USE_REALTIME
		126	# define EV_USE_REALTIME 0
		127	#endif
		128
		129	/**/
63		130
64	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	131	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
65	#define MAX_BLOCKTIME 60.	132	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		133	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		134	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
66		135
		136	#ifdef EV_H
		137	# include EV_H
		138	#else
67	#include "ev.h"	139	# include "ev.h"
		140	#endif
		141
		142	#if __GNUC__ >= 3
		143	# define expect(expr,value) __builtin_expect ((expr),(value))
		144	# define inline inline
		145	#else
		146	# define expect(expr,value) (expr)
		147	# define inline static
		148	#endif
		149
		150	#define expect_false(expr) expect ((expr) != 0, 0)
		151	#define expect_true(expr) expect ((expr) != 0, 1)
		152
		153	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		154	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
68		155
69	typedef struct ev_watcher *W;	156	typedef struct ev_watcher *W;
70	typedef struct ev_watcher_list *WL;	157	typedef struct ev_watcher_list *WL;
71	typedef struct ev_watcher_time *WT;	158	typedef struct ev_watcher_time *WT;
72		159
73	static ev_tstamp now, diff; /* monotonic clock */	160	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
74	ev_tstamp ev_now;
75	int ev_method;
76		161
77	static int have_monotonic; /* runtime */	162	#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		163
83	/*****************************************************************************/	164	/*****************************************************************************/
84		165
85	ev_tstamp	166	static void (*syserr_cb)(const char *msg);
		167
		168	void ev_set_syserr_cb (void (*cb)(const char *msg))
		169	{
		170	syserr_cb = cb;
		171	}
		172
		173	static void
		174	syserr (const char *msg)
		175	{
		176	if (!msg)
		177	msg = "(libev) system error";
		178
		179	if (syserr_cb)
		180	syserr_cb (msg);
		181	else
		182	{
		183	perror (msg);
		184	abort ();
		185	}
		186	}
		187
		188	static void *(*alloc)(void *ptr, long size);
		189
		190	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		191	{
		192	alloc = cb;
		193	}
		194
		195	static void *
		196	ev_realloc (void *ptr, long size)
		197	{
		198	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		199
		200	if (!ptr && size)
		201	{
		202	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		203	abort ();
		204	}
		205
		206	return ptr;
		207	}
		208
		209	#define ev_malloc(size) ev_realloc (0, (size))
		210	#define ev_free(ptr) ev_realloc ((ptr), 0)
		211
		212	/*****************************************************************************/
		213
		214	typedef struct
		215	{
		216	WL head;
		217	unsigned char events;
		218	unsigned char reify;
		219	} ANFD;
		220
		221	typedef struct
		222	{
		223	W w;
		224	int events;
		225	} ANPENDING;
		226
		227	#if EV_MULTIPLICITY
		228
		229	struct ev_loop
		230	{
		231	ev_tstamp ev_rt_now;
		232	#define VAR(name,decl) decl;
		233	#include "ev_vars.h"
		234	#undef VAR
		235	};
		236	#include "ev_wrap.h"
		237
		238	struct ev_loop default_loop_struct;
		239	static struct ev_loop *default_loop;
		240
		241	#else
		242
		243	ev_tstamp ev_rt_now;
		244	#define VAR(name,decl) static decl;
		245	#include "ev_vars.h"
		246	#undef VAR
		247
		248	static int default_loop;
		249
		250	#endif
		251
		252	/*****************************************************************************/
		253
		254	inline ev_tstamp
86	ev_time (void)	255	ev_time (void)
87	{	256	{
88	#if HAVE_REALTIME	257	#if EV_USE_REALTIME
89	struct timespec ts;	258	struct timespec ts;
90	clock_gettime (CLOCK_REALTIME, &ts);	259	clock_gettime (CLOCK_REALTIME, &ts);
91	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
92	#else	261	#else
93	struct timeval tv;	262	struct timeval tv;
94	gettimeofday (&tv, 0);	263	gettimeofday (&tv, 0);
95	return tv.tv_sec + tv.tv_usec * 1e-6;	264	return tv.tv_sec + tv.tv_usec * 1e-6;
96	#endif	265	#endif
97	}	266	}
98		267
99	static ev_tstamp	268	inline ev_tstamp
100	get_clock (void)	269	get_clock (void)
101	{	270	{
102	#if HAVE_MONOTONIC	271	#if EV_USE_MONOTONIC
103	if (have_monotonic)	272	if (expect_true (have_monotonic))
104	{	273	{
105	struct timespec ts;	274	struct timespec ts;
106	clock_gettime (CLOCK_MONOTONIC, &ts);	275	clock_gettime (CLOCK_MONOTONIC, &ts);
107	return ts.tv_sec + ts.tv_nsec * 1e-9;	276	return ts.tv_sec + ts.tv_nsec * 1e-9;
108	}	277	}
109	#endif	278	#endif
110		279
111	return ev_time ();	280	return ev_time ();
112	}	281	}
113		282
		283	#if EV_MULTIPLICITY
		284	ev_tstamp
		285	ev_now (EV_P)
		286	{
		287	return ev_rt_now;
		288	}
		289	#endif
		290
		291	#define array_roundsize(type,n) ((n) | 4 & ~3)
		292
114	#define array_needsize(base,cur,cnt,init) \	293	#define array_needsize(type,base,cur,cnt,init) \
115	if ((cnt) > cur) \	294	if (expect_false ((cnt) > cur)) \
116	{ \	295	{ \
117	int newcnt = cur ? cur << 1 : 16; \	296	int newcnt = cur; \
		297	do \
		298	{ \
		299	newcnt = array_roundsize (type, newcnt << 1); \
		300	} \
		301	while ((cnt) > newcnt); \
		302	\
118	base = realloc (base, sizeof (*base) * (newcnt)); \	303	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
119	init (base + cur, newcnt - cur); \	304	init (base + cur, newcnt - cur); \
120	cur = newcnt; \	305	cur = newcnt; \
121	}	306	}
		307
		308	#define array_slim(type,stem) \
		309	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		310	{ \
		311	stem ## max = array_roundsize (stem ## cnt >> 1); \
		312	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		313	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		314	}
		315
		316	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		317	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		318	#define array_free_microshit(stem) \
		319	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		320
		321	#define array_free(stem, idx) \
		322	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
122		323
123	/*****************************************************************************/	324	/*****************************************************************************/
124		325
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	326	static void
138	anfds_init (ANFD *base, int count)	327	anfds_init (ANFD *base, int count)
139	{	328	{
140	while (count--)	329	while (count--)
141	{	330	{
142	base->head = 0;	331	base->head = 0;
143	base->wev = base->rev = EV_NONE;	332	base->events = EV_NONE;
		333	base->reify = 0;
		334
144	++base;	335	++base;
145	}	336	}
146	}	337	}
147		338
148	typedef struct	339	void
		340	ev_feed_event (EV_P_ void *w, int revents)
149	{	341	{
150	W w;	342	W w_ = (W)w;
151	int events;
152	} ANPENDING;
153		343
154	static ANPENDING *pendings;	344	if (w_->pending)
155	static int pendingmax, pendingcnt;
156
157	static void
158	event (W w, int events)
159	{
160	if (w->active)
161	{	345	{
162	w->pending = ++pendingcnt;
163	array_needsize (pendings, pendingmax, pendingcnt, );
164	pendings [pendingcnt - 1].w = w;
165	pendings [pendingcnt - 1].events = events;	346	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		347	return;
166	}	348	}
167	}
168		349
		350	w_->pending = ++pendingcnt [ABSPRI (w_)];
		351	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
		352	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		353	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		354	}
		355
169	static void	356	static void
		357	queue_events (EV_P_ W *events, int eventcnt, int type)
		358	{
		359	int i;
		360
		361	for (i = 0; i < eventcnt; ++i)
		362	ev_feed_event (EV_A_ events [i], type);
		363	}
		364
		365	inline void
170	fd_event (int fd, int events)	366	fd_event (EV_P_ int fd, int revents)
171	{	367	{
172	ANFD *anfd = anfds + fd;	368	ANFD *anfd = anfds + fd;
173	struct ev_io *w;	369	struct ev_io *w;
174		370
175	for (w = anfd->head; w; w = w->next)	371	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
176	{	372	{
177	int ev = w->events & events;	373	int ev = w->events & revents;
178		374
179	if (ev)	375	if (ev)
180	event ((W)w, ev);	376	ev_feed_event (EV_A_ (W)w, ev);
181	}	377	}
182	}	378	}
183		379
		380	void
		381	ev_feed_fd_event (EV_P_ int fd, int revents)
		382	{
		383	fd_event (EV_A_ fd, revents);
		384	}
		385
		386	/*****************************************************************************/
		387
184	static void	388	static void
185	queue_events (W *events, int eventcnt, int type)	389	fd_reify (EV_P)
186	{	390	{
187	int i;	391	int i;
188		392
189	for (i = 0; i < eventcnt; ++i)	393	for (i = 0; i < fdchangecnt; ++i)
190	event (events [i], type);	394	{
		395	int fd = fdchanges [i];
		396	ANFD *anfd = anfds + fd;
		397	struct ev_io *w;
		398
		399	int events = 0;
		400
		401	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		402	events |= w->events;
		403
		404	anfd->reify = 0;
		405
		406	method_modify (EV_A_ fd, anfd->events, events);
		407	anfd->events = events;
		408	}
		409
		410	fdchangecnt = 0;
		411	}
		412
		413	static void
		414	fd_change (EV_P_ int fd)
		415	{
		416	if (anfds [fd].reify)
		417	return;
		418
		419	anfds [fd].reify = 1;
		420
		421	++fdchangecnt;
		422	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		423	fdchanges [fdchangecnt - 1] = fd;
		424	}
		425
		426	static void
		427	fd_kill (EV_P_ int fd)
		428	{
		429	struct ev_io *w;
		430
		431	while ((w = (struct ev_io *)anfds [fd].head))
		432	{
		433	ev_io_stop (EV_A_ w);
		434	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		435	}
		436	}
		437
		438	static int
		439	fd_valid (int fd)
		440	{
		441	#ifdef WIN32
		442	return !!win32_get_osfhandle (fd);
		443	#else
		444	return fcntl (fd, F_GETFD) != -1;
		445	#endif
		446	}
		447
		448	/* called on EBADF to verify fds */
		449	static void
		450	fd_ebadf (EV_P)
		451	{
		452	int fd;
		453
		454	for (fd = 0; fd < anfdmax; ++fd)
		455	if (anfds [fd].events)
		456	if (!fd_valid (fd) == -1 && errno == EBADF)
		457	fd_kill (EV_A_ fd);
		458	}
		459
		460	/* called on ENOMEM in select/poll to kill some fds and retry */
		461	static void
		462	fd_enomem (EV_P)
		463	{
		464	int fd;
		465
		466	for (fd = anfdmax; fd--; )
		467	if (anfds [fd].events)
		468	{
		469	fd_kill (EV_A_ fd);
		470	return;
		471	}
		472	}
		473
		474	/* usually called after fork if method needs to re-arm all fds from scratch */
		475	static void
		476	fd_rearm_all (EV_P)
		477	{
		478	int fd;
		479
		480	/* this should be highly optimised to not do anything but set a flag */
		481	for (fd = 0; fd < anfdmax; ++fd)
		482	if (anfds [fd].events)
		483	{
		484	anfds [fd].events = 0;
		485	fd_change (EV_A_ fd);
		486	}
191	}	487	}
192		488
193	/*****************************************************************************/	489	/*****************************************************************************/
194		490
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	491	static void
202	upheap (WT *timers, int k)	492	upheap (WT *heap, int k)
203	{	493	{
204	WT w = timers [k];	494	WT w = heap [k];
205		495
206	while (k && timers [k >> 1]->at > w->at)	496	while (k && heap [k >> 1]->at > w->at)
207	{	497	{
208	timers [k] = timers [k >> 1];	498	heap [k] = heap [k >> 1];
209	timers [k]->active = k + 1;	499	((W)heap [k])->active = k + 1;
210	k >>= 1;	500	k >>= 1;
211	}	501	}
212		502
213	timers [k] = w;	503	heap [k] = w;
214	timers [k]->active = k + 1;	504	((W)heap [k])->active = k + 1;
215		505
216	}	506	}
217		507
218	static void	508	static void
219	downheap (WT *timers, int N, int k)	509	downheap (WT *heap, int N, int k)
220	{	510	{
221	WT w = timers [k];	511	WT w = heap [k];
222		512
223	while (k < (N >> 1))	513	while (k < (N >> 1))
224	{	514	{
225	int j = k << 1;	515	int j = k << 1;
226		516
227	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	517	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
228	++j;	518	++j;
229		519
230	if (w->at <= timers [j]->at)	520	if (w->at <= heap [j]->at)
231	break;	521	break;
232		522
233	timers [k] = timers [j];	523	heap [k] = heap [j];
234	timers [k]->active = k + 1;	524	((W)heap [k])->active = k + 1;
235	k = j;	525	k = j;
236	}	526	}
237		527
238	timers [k] = w;	528	heap [k] = w;
239	timers [k]->active = k + 1;	529	((W)heap [k])->active = k + 1;
		530	}
		531
		532	inline void
		533	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		534	{
		535	ev_tstamp old_at = heap [k]->at;
		536	heap [k]->at = at;
		537
		538	if (old_at < at)
		539	downheap (heap, N, k);
		540	else
		541	upheap (heap, k);
240	}	542	}
241		543
242	/*****************************************************************************/	544	/*****************************************************************************/
243		545
244	typedef struct	546	typedef struct
245	{	547	{
246	struct ev_signal *head;	548	WL head;
247	sig_atomic_t gotsig;	549	sig_atomic_t volatile gotsig;
248	} ANSIG;	550	} ANSIG;
249		551
250	static ANSIG *signals;	552	static ANSIG *signals;
251	static int signalmax;	553	static int signalmax;
252		554
253	static int sigpipe [2];	555	static int sigpipe [2];
254	static sig_atomic_t gotsig;	556	static sig_atomic_t volatile gotsig;
255	static struct ev_io sigev;	557	static struct ev_io sigev;
256		558
257	static void	559	static void
258	signals_init (ANSIG *base, int count)	560	signals_init (ANSIG *base, int count)
259	{	561	{
260	while (count--)	562	while (count--)
261	{	563	{
262	base->head = 0;	564	base->head = 0;
263	base->gotsig = 0;	565	base->gotsig = 0;
		566
264	++base;	567	++base;
265	}	568	}
266	}	569	}
267		570
268	static void	571	static void
269	sighandler (int signum)	572	sighandler (int signum)
270	{	573	{
		574	#if WIN32
		575	signal (signum, sighandler);
		576	#endif
		577
271	signals [signum - 1].gotsig = 1;	578	signals [signum - 1].gotsig = 1;
272		579
273	if (!gotsig)	580	if (!gotsig)
274	{	581	{
		582	int old_errno = errno;
275	gotsig = 1;	583	gotsig = 1;
		584	#ifdef WIN32
		585	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		586	#else
276	write (sigpipe [1], &gotsig, 1);	587	write (sigpipe [1], &signum, 1);
		588	#endif
		589	errno = old_errno;
277	}	590	}
278	}	591	}
279		592
		593	void
		594	ev_feed_signal_event (EV_P_ int signum)
		595	{
		596	WL w;
		597
		598	#if EV_MULTIPLICITY
		599	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		600	#endif
		601
		602	--signum;
		603
		604	if (signum < 0 || signum >= signalmax)
		605	return;
		606
		607	signals [signum].gotsig = 0;
		608
		609	for (w = signals [signum].head; w; w = w->next)
		610	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		611	}
		612
280	static void	613	static void
281	sigcb (struct ev_io *iow, int revents)	614	sigcb (EV_P_ struct ev_io *iow, int revents)
282	{	615	{
283	struct ev_signal *w;
284	int sig;	616	int signum;
285		617
		618	#ifdef WIN32
		619	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		620	#else
		621	read (sigpipe [0], &revents, 1);
		622	#endif
286	gotsig = 0;	623	gotsig = 0;
287	read (sigpipe [0], &revents, 1);
288		624
289	for (sig = signalmax; sig--; )	625	for (signum = signalmax; signum--; )
290	if (signals [sig].gotsig)	626	if (signals [signum].gotsig)
291	{	627	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	}	628	}
298		629
299	static void	630	static void
300	siginit (void)	631	siginit (EV_P)
301	{	632	{
		633	#ifndef WIN32
302	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	634	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
303	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	635	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
304		636
305	/* rather than sort out wether we really need nb, set it */	637	/* rather than sort out wether we really need nb, set it */
306	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	638	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
307	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	639	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		640	#endif
308		641
309	evio_set (&sigev, sigpipe [0], EV_READ);	642	ev_io_set (&sigev, sigpipe [0], EV_READ);
310	evio_start (&sigev);	643	ev_io_start (EV_A_ &sigev);
		644	ev_unref (EV_A); /* child watcher should not keep loop alive */
311	}	645	}
312		646
313	/*****************************************************************************/	647	/*****************************************************************************/
314		648
315	static struct ev_idle **idles;	649	static struct ev_child *childs [PID_HASHSIZE];
316	static int idlemax, idlecnt;
317		650
318	static struct ev_check **checks;	651	#ifndef WIN32
319	static int checkmax, checkcnt;	652
		653	static struct ev_signal childev;
		654
		655	#ifndef WCONTINUED
		656	# define WCONTINUED 0
		657	#endif
		658
		659	static void
		660	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		661	{
		662	struct ev_child *w;
		663
		664	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		665	if (w->pid == pid || !w->pid)
		666	{
		667	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		668	w->rpid = pid;
		669	w->rstatus = status;
		670	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		671	}
		672	}
		673
		674	static void
		675	childcb (EV_P_ struct ev_signal *sw, int revents)
		676	{
		677	int pid, status;
		678
		679	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		680	{
		681	/* make sure we are called again until all childs have been reaped */
		682	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		683
		684	child_reap (EV_A_ sw, pid, pid, status);
		685	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		686	}
		687	}
		688
		689	#endif
320		690
321	/*****************************************************************************/	691	/*****************************************************************************/
322		692
		693	#if EV_USE_KQUEUE
		694	# include "ev_kqueue.c"
		695	#endif
323	#if HAVE_EPOLL	696	#if EV_USE_EPOLL
324	# include "ev_epoll.c"	697	# include "ev_epoll.c"
325	#endif	698	#endif
		699	#if EV_USE_POLL
		700	# include "ev_poll.c"
		701	#endif
326	#if HAVE_SELECT	702	#if EV_USE_SELECT
327	# include "ev_select.c"	703	# include "ev_select.c"
328	#endif	704	#endif
329		705
330	int ev_init (int flags)	706	int
		707	ev_version_major (void)
331	{	708	{
		709	return EV_VERSION_MAJOR;
		710	}
		711
		712	int
		713	ev_version_minor (void)
		714	{
		715	return EV_VERSION_MINOR;
		716	}
		717
		718	/* return true if we are running with elevated privileges and should ignore env variables */
		719	static int
		720	enable_secure (void)
		721	{
		722	#ifdef WIN32
		723	return 0;
		724	#else
		725	return getuid () != geteuid ()
		726	|| getgid () != getegid ();
		727	#endif
		728	}
		729
		730	int
		731	ev_method (EV_P)
		732	{
		733	return method;
		734	}
		735
		736	static void
		737	loop_init (EV_P_ int methods)
		738	{
		739	if (!method)
		740	{
332	#if HAVE_MONOTONIC	741	#if EV_USE_MONOTONIC
333	{	742	{
334	struct timespec ts;	743	struct timespec ts;
335	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	744	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
336	have_monotonic = 1;	745	have_monotonic = 1;
337	}	746	}
338	#endif	747	#endif
339		748
340	ev_now = ev_time ();	749	ev_rt_now = ev_time ();
341	now = get_clock ();	750	mn_now = get_clock ();
342	diff = ev_now - now;	751	now_floor = mn_now;
		752	rtmn_diff = ev_rt_now - mn_now;
343		753
344	if (pipe (sigpipe))	754	if (methods == EVMETHOD_AUTO)
345	return 0;	755	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		756	methods = atoi (getenv ("LIBEV_METHODS"));
		757	else
		758	methods = EVMETHOD_ANY;
346		759
347	ev_method = EVMETHOD_NONE;	760	method = 0;
		761	#if EV_USE_WIN32
		762	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		763	#endif
		764	#if EV_USE_KQUEUE
		765	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		766	#endif
348	#if HAVE_EPOLL	767	#if EV_USE_EPOLL
349	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	768	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
350	#endif	769	#endif
		770	#if EV_USE_POLL
		771	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		772	#endif
351	#if HAVE_SELECT	773	#if EV_USE_SELECT
352	if (ev_method == EVMETHOD_NONE) select_init (flags);	774	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
353	#endif	775	#endif
354		776
355	if (ev_method)
356	{
357	evw_init (&sigev, sigcb);	777	ev_init (&sigev, sigcb);
		778	ev_set_priority (&sigev, EV_MAXPRI);
		779	}
		780	}
		781
		782	void
		783	loop_destroy (EV_P)
		784	{
		785	int i;
		786
		787	#if EV_USE_WIN32
		788	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		789	#endif
		790	#if EV_USE_KQUEUE
		791	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		792	#endif
		793	#if EV_USE_EPOLL
		794	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		795	#endif
		796	#if EV_USE_POLL
		797	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		798	#endif
		799	#if EV_USE_SELECT
		800	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		801	#endif
		802
		803	for (i = NUMPRI; i--; )
		804	array_free (pending, [i]);
		805
		806	/* have to use the microsoft-never-gets-it-right macro */
		807	array_free_microshit (fdchange);
		808	array_free_microshit (timer);
		809	array_free_microshit (periodic);
		810	array_free_microshit (idle);
		811	array_free_microshit (prepare);
		812	array_free_microshit (check);
		813
		814	method = 0;
		815	}
		816
		817	static void
		818	loop_fork (EV_P)
		819	{
		820	#if EV_USE_EPOLL
		821	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		822	#endif
		823	#if EV_USE_KQUEUE
		824	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		825	#endif
		826
		827	if (ev_is_active (&sigev))
		828	{
		829	/* default loop */
		830
		831	ev_ref (EV_A);
		832	ev_io_stop (EV_A_ &sigev);
		833	close (sigpipe [0]);
		834	close (sigpipe [1]);
		835
		836	while (pipe (sigpipe))
		837	syserr ("(libev) error creating pipe");
		838
358	siginit ();	839	siginit (EV_A);
		840	}
		841
		842	postfork = 0;
		843	}
		844
		845	#if EV_MULTIPLICITY
		846	struct ev_loop *
		847	ev_loop_new (int methods)
		848	{
		849	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		850
		851	memset (loop, 0, sizeof (struct ev_loop));
		852
		853	loop_init (EV_A_ methods);
		854
		855	if (ev_method (EV_A))
		856	return loop;
		857
		858	return 0;
		859	}
		860
		861	void
		862	ev_loop_destroy (EV_P)
		863	{
		864	loop_destroy (EV_A);
		865	ev_free (loop);
		866	}
		867
		868	void
		869	ev_loop_fork (EV_P)
		870	{
		871	postfork = 1;
		872	}
		873
		874	#endif
		875
		876	#if EV_MULTIPLICITY
		877	struct ev_loop *
		878	#else
		879	int
		880	#endif
		881	ev_default_loop (int methods)
		882	{
		883	if (sigpipe [0] == sigpipe [1])
		884	if (pipe (sigpipe))
		885	return 0;
		886
		887	if (!default_loop)
359	}	888	{
		889	#if EV_MULTIPLICITY
		890	struct ev_loop *loop = default_loop = &default_loop_struct;
		891	#else
		892	default_loop = 1;
		893	#endif
360		894
361	return ev_method;	895	loop_init (EV_A_ methods);
		896
		897	if (ev_method (EV_A))
		898	{
		899	siginit (EV_A);
		900
		901	#ifndef WIN32
		902	ev_signal_init (&childev, childcb, SIGCHLD);
		903	ev_set_priority (&childev, EV_MAXPRI);
		904	ev_signal_start (EV_A_ &childev);
		905	ev_unref (EV_A); /* child watcher should not keep loop alive */
		906	#endif
		907	}
		908	else
		909	default_loop = 0;
		910	}
		911
		912	return default_loop;
		913	}
		914
		915	void
		916	ev_default_destroy (void)
		917	{
		918	#if EV_MULTIPLICITY
		919	struct ev_loop *loop = default_loop;
		920	#endif
		921
		922	#ifndef WIN32
		923	ev_ref (EV_A); /* child watcher */
		924	ev_signal_stop (EV_A_ &childev);
		925	#endif
		926
		927	ev_ref (EV_A); /* signal watcher */
		928	ev_io_stop (EV_A_ &sigev);
		929
		930	close (sigpipe [0]); sigpipe [0] = 0;
		931	close (sigpipe [1]); sigpipe [1] = 0;
		932
		933	loop_destroy (EV_A);
		934	}
		935
		936	void
		937	ev_default_fork (void)
		938	{
		939	#if EV_MULTIPLICITY
		940	struct ev_loop *loop = default_loop;
		941	#endif
		942
		943	if (method)
		944	postfork = 1;
362	}	945	}
363		946
364	/*****************************************************************************/	947	/*****************************************************************************/
365		948
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	949	static int
393	fd_reify (void)	950	any_pending (EV_P)
394	{	951	{
395	int i;	952	int pri;
396		953
397	for (i = 0; i < fdchangecnt; ++i)	954	for (pri = NUMPRI; pri--; )
398	{	955	if (pendingcnt [pri])
399	int fd = fdchanges [i];	956	return 1;
400	ANFD *anfd = anfds + fd;
401	struct ev_io *w;
402		957
403	int wev = 0;	958	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	}	959	}
417		960
418	static void	961	static void
419	call_pending ()	962	call_pending (EV_P)
420	{	963	{
421	int i;	964	int pri;
422		965
423	for (i = 0; i < pendingcnt; ++i)	966	for (pri = NUMPRI; pri--; )
		967	while (pendingcnt [pri])
424	{	968	{
425	ANPENDING *p = pendings + i;	969	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
426		970
427	if (p->w)	971	if (p->w)
428	{	972	{
429	p->w->pending = 0;	973	p->w->pending = 0;
430	p->w->cb (p->w, p->events);	974	EV_CB_INVOKE (p->w, p->events);
431	}	975	}
432	}	976	}
433
434	pendingcnt = 0;
435	}	977	}
436		978
437	static void	979	static void
438	timers_reify ()	980	timers_reify (EV_P)
439	{	981	{
440	while (timercnt && timers [0]->at <= now)	982	while (timercnt && ((WT)timers [0])->at <= mn_now)
441	{	983	{
442	struct ev_timer *w = timers [0];	984	struct ev_timer *w = timers [0];
443		985
444	event ((W)w, EV_TIMEOUT);	986	assert (("inactive timer on timer heap detected", ev_is_active (w)));
445		987
446	/* first reschedule or stop timer */	988	/* first reschedule or stop timer */
447	if (w->repeat)	989	if (w->repeat)
448	{	990	{
		991	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
449	w->at = now + w->repeat;	992	((WT)w)->at = mn_now + w->repeat;
450	assert (("timer timeout in the past, negative repeat?", w->at > now));
451	downheap ((WT *)timers, timercnt, 0);	993	downheap ((WT *)timers, timercnt, 0);
452	}	994	}
453	else	995	else
454	evtimer_stop (w); /* nonrepeating: stop timer */	996	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
455	}
456	}
457		997
		998	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		999	}
		1000	}
		1001
458	static void	1002	static void
459	periodics_reify ()	1003	periodics_reify (EV_P)
460	{	1004	{
461	while (periodiccnt && periodics [0]->at <= ev_now)	1005	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
462	{	1006	{
463	struct ev_periodic *w = periodics [0];	1007	struct ev_periodic *w = periodics [0];
464		1008
		1009	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1010
465	/* first reschedule or stop timer */	1011	/* first reschedule or stop timer */
466	if (w->interval)	1012	if (w->reschedule_cb)
467	{	1013	{
		1014	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1015
		1016	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1017	downheap ((WT *)periodics, periodiccnt, 0);
		1018	}
		1019	else if (w->interval)
		1020	{
468	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1021	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
469	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1022	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
470	downheap ((WT *)periodics, periodiccnt, 0);	1023	downheap ((WT *)periodics, periodiccnt, 0);
471	}	1024	}
472	else	1025	else
473	evperiodic_stop (w); /* nonrepeating: stop timer */	1026	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
474		1027
475	event ((W)w, EV_TIMEOUT);	1028	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
476	}	1029	}
477	}	1030	}
478		1031
479	static void	1032	static void
480	periodics_reschedule (ev_tstamp diff)	1033	periodics_reschedule (EV_P)
481	{	1034	{
482	int i;	1035	int i;
483		1036
484	/* adjust periodics after time jump */	1037	/* adjust periodics after time jump */
485	for (i = 0; i < periodiccnt; ++i)	1038	for (i = 0; i < periodiccnt; ++i)
486	{	1039	{
487	struct ev_periodic *w = periodics [i];	1040	struct ev_periodic *w = periodics [i];
488		1041
		1042	if (w->reschedule_cb)
		1043	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
489	if (w->interval)	1044	else if (w->interval)
		1045	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1046	}
		1047
		1048	/* now rebuild the heap */
		1049	for (i = periodiccnt >> 1; i--; )
		1050	downheap ((WT *)periodics, periodiccnt, i);
		1051	}
		1052
		1053	inline int
		1054	time_update_monotonic (EV_P)
		1055	{
		1056	mn_now = get_clock ();
		1057
		1058	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1059	{
		1060	ev_rt_now = rtmn_diff + mn_now;
		1061	return 0;
		1062	}
		1063	else
		1064	{
		1065	now_floor = mn_now;
		1066	ev_rt_now = ev_time ();
		1067	return 1;
		1068	}
		1069	}
		1070
		1071	static void
		1072	time_update (EV_P)
		1073	{
		1074	int i;
		1075
		1076	#if EV_USE_MONOTONIC
		1077	if (expect_true (have_monotonic))
		1078	{
		1079	if (time_update_monotonic (EV_A))
490	{	1080	{
491	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1081	ev_tstamp odiff = rtmn_diff;
492		1082
493	if (fabs (diff) >= 1e-4)	1083	for (i = 4; --i; ) /* loop a few times, before making important decisions */
494	{	1084	{
495	evperiodic_stop (w);	1085	rtmn_diff = ev_rt_now - mn_now;
496	evperiodic_start (w);
497		1086
498	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1087	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1088	return; /* all is well */
		1089
		1090	ev_rt_now = ev_time ();
		1091	mn_now = get_clock ();
		1092	now_floor = mn_now;
499	}	1093	}
		1094
		1095	periodics_reschedule (EV_A);
		1096	/* no timer adjustment, as the monotonic clock doesn't jump */
		1097	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
500	}	1098	}
501	}	1099	}
502	}	1100	else
503		1101	#endif
504	static void	1102	{
505	time_update ()
506	{
507	int i;
508
509	ev_now = ev_time ();	1103	ev_rt_now = ev_time ();
510		1104
511	if (have_monotonic)	1105	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
512	{
513	ev_tstamp odiff = diff;
514
515	for (i = 4; --i; ) /* loop a few times, before making important decisions */
516	{	1106	{
517	now = get_clock ();
518	diff = ev_now - now;
519
520	if (fabs (odiff - diff) < MIN_TIMEJUMP)
521	return; /* all is well */
522
523	ev_now = ev_time ();
524	}
525
526	periodics_reschedule (diff - odiff);
527	/* no timer adjustment, as the monotonic clock doesn't jump */
528	}
529	else
530	{
531	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
532	{
533	periodics_reschedule (ev_now - now);	1107	periodics_reschedule (EV_A);
534		1108
535	/* adjust timers. this is easy, as the offset is the same for all */	1109	/* adjust timers. this is easy, as the offset is the same for all */
536	for (i = 0; i < timercnt; ++i)	1110	for (i = 0; i < timercnt; ++i)
537	timers [i]->at += diff;	1111	((WT)timers [i])->at += ev_rt_now - mn_now;
538	}	1112	}
539		1113
540	now = ev_now;	1114	mn_now = ev_rt_now;
541	}	1115	}
542	}	1116	}
543		1117
544	int ev_loop_done;	1118	void
		1119	ev_ref (EV_P)
		1120	{
		1121	++activecnt;
		1122	}
545		1123
		1124	void
		1125	ev_unref (EV_P)
		1126	{
		1127	--activecnt;
		1128	}
		1129
		1130	static int loop_done;
		1131
		1132	void
546	void ev_loop (int flags)	1133	ev_loop (EV_P_ int flags)
547	{	1134	{
548	double block;	1135	double block;
549	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1136	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
550
551	if (checkcnt)
552	{
553	queue_events ((W *)checks, checkcnt, EV_CHECK);
554	call_pending ();
555	}
556		1137
557	do	1138	do
558	{	1139	{
		1140	/* queue check watchers (and execute them) */
		1141	if (expect_false (preparecnt))
		1142	{
		1143	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1144	call_pending (EV_A);
		1145	}
		1146
		1147	/* we might have forked, so reify kernel state if necessary */
		1148	if (expect_false (postfork))
		1149	loop_fork (EV_A);
		1150
559	/* update fd-related kernel structures */	1151	/* update fd-related kernel structures */
560	fd_reify ();	1152	fd_reify (EV_A);
561		1153
562	/* calculate blocking time */	1154	/* calculate blocking time */
563		1155
564	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1156	/* we only need this for !monotonic clock or timers, but as we basically
		1157	always have timers, we just calculate it always */
		1158	#if EV_USE_MONOTONIC
		1159	if (expect_true (have_monotonic))
		1160	time_update_monotonic (EV_A);
		1161	else
		1162	#endif
		1163	{
565	ev_now = ev_time ();	1164	ev_rt_now = ev_time ();
		1165	mn_now = ev_rt_now;
		1166	}
566		1167
567	if (flags & EVLOOP_NONBLOCK || idlecnt)	1168	if (flags & EVLOOP_NONBLOCK || idlecnt)
568	block = 0.;	1169	block = 0.;
569	else	1170	else
570	{	1171	{
571	block = MAX_BLOCKTIME;	1172	block = MAX_BLOCKTIME;
572		1173
573	if (timercnt)	1174	if (timercnt)
574	{	1175	{
575	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1176	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
576	if (block > to) block = to;	1177	if (block > to) block = to;
577	}	1178	}
578		1179
579	if (periodiccnt)	1180	if (periodiccnt)
580	{	1181	{
581	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1182	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
582	if (block > to) block = to;	1183	if (block > to) block = to;
583	}	1184	}
584		1185
585	if (block < 0.) block = 0.;	1186	if (block < 0.) block = 0.;
586	}	1187	}
587		1188
588	method_poll (block);	1189	method_poll (EV_A_ block);
589		1190
590	/* update ev_now, do magic */	1191	/* update ev_rt_now, do magic */
591	time_update ();	1192	time_update (EV_A);
592		1193
593	/* queue pending timers and reschedule them */	1194	/* queue pending timers and reschedule them */
		1195	timers_reify (EV_A); /* relative timers called last */
594	periodics_reify (); /* absolute timers first */	1196	periodics_reify (EV_A); /* absolute timers called first */
595	timers_reify (); /* relative timers second */
596		1197
597	/* queue idle watchers unless io or timers are pending */	1198	/* queue idle watchers unless io or timers are pending */
598	if (!pendingcnt)	1199	if (idlecnt && !any_pending (EV_A))
599	queue_events ((W *)idles, idlecnt, EV_IDLE);	1200	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
600		1201
601	/* queue check and possibly idle watchers */	1202	/* queue check watchers, to be executed first */
		1203	if (checkcnt)
602	queue_events ((W *)checks, checkcnt, EV_CHECK);	1204	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
603		1205
604	call_pending ();	1206	call_pending (EV_A);
605	}	1207	}
606	while (!ev_loop_done);	1208	while (activecnt && !loop_done);
607		1209
608	if (ev_loop_done != 2)	1210	if (loop_done != 2)
609	ev_loop_done = 0;	1211	loop_done = 0;
		1212	}
		1213
		1214	void
		1215	ev_unloop (EV_P_ int how)
		1216	{
		1217	loop_done = how;
610	}	1218	}
611		1219
612	/*****************************************************************************/	1220	/*****************************************************************************/
613		1221
614	static void	1222	inline void
615	wlist_add (WL *head, WL elem)	1223	wlist_add (WL *head, WL elem)
616	{	1224	{
617	elem->next = *head;	1225	elem->next = *head;
618	*head = elem;	1226	*head = elem;
619	}	1227	}
620		1228
621	static void	1229	inline void
622	wlist_del (WL *head, WL elem)	1230	wlist_del (WL *head, WL elem)
623	{	1231	{
624	while (*head)	1232	while (*head)
625	{	1233	{
626	if (*head == elem)	1234	if (*head == elem)
…		…
631		1239
632	head = &(*head)->next;	1240	head = &(*head)->next;
633	}	1241	}
634	}	1242	}
635		1243
636	static void	1244	inline void
637	ev_clear (W w)	1245	ev_clear_pending (EV_P_ W w)
638	{	1246	{
639	if (w->pending)	1247	if (w->pending)
640	{	1248	{
641	pendings [w->pending - 1].w = 0;	1249	pendings [ABSPRI (w)][w->pending - 1].w = 0;
642	w->pending = 0;	1250	w->pending = 0;
643	}	1251	}
644	}	1252	}
645		1253
646	static void	1254	inline void
647	ev_start (W w, int active)	1255	ev_start (EV_P_ W w, int active)
648	{	1256	{
		1257	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1258	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1259
649	w->active = active;	1260	w->active = active;
		1261	ev_ref (EV_A);
650	}	1262	}
651		1263
652	static void	1264	inline void
653	ev_stop (W w)	1265	ev_stop (EV_P_ W w)
654	{	1266	{
		1267	ev_unref (EV_A);
655	w->active = 0;	1268	w->active = 0;
656	}	1269	}
657		1270
658	/*****************************************************************************/	1271	/*****************************************************************************/
659		1272
660	void	1273	void
661	evio_start (struct ev_io *w)	1274	ev_io_start (EV_P_ struct ev_io *w)
662	{	1275	{
		1276	int fd = w->fd;
		1277
663	if (ev_is_active (w))	1278	if (ev_is_active (w))
664	return;	1279	return;
665		1280
666	int fd = w->fd;	1281	assert (("ev_io_start called with negative fd", fd >= 0));
667		1282
668	ev_start ((W)w, 1);	1283	ev_start (EV_A_ (W)w, 1);
669	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1284	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
670	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1285	wlist_add ((WL *)&anfds[fd].head, (WL)w);
671		1286
672	++fdchangecnt;	1287	fd_change (EV_A_ fd);
673	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
674	fdchanges [fdchangecnt - 1] = fd;
675	}	1288	}
676		1289
677	void	1290	void
678	evio_stop (struct ev_io *w)	1291	ev_io_stop (EV_P_ struct ev_io *w)
679	{	1292	{
680	ev_clear ((W)w);	1293	ev_clear_pending (EV_A_ (W)w);
681	if (!ev_is_active (w))	1294	if (!ev_is_active (w))
682	return;	1295	return;
683		1296
684	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1297	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
685	ev_stop ((W)w);	1298	ev_stop (EV_A_ (W)w);
686		1299
687	++fdchangecnt;	1300	fd_change (EV_A_ w->fd);
688	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
689	fdchanges [fdchangecnt - 1] = w->fd;
690	}	1301	}
691		1302
692	void	1303	void
693	evtimer_start (struct ev_timer *w)	1304	ev_timer_start (EV_P_ struct ev_timer *w)
694	{	1305	{
695	if (ev_is_active (w))	1306	if (ev_is_active (w))
696	return;	1307	return;
697		1308
698	w->at += now;	1309	((WT)w)->at += mn_now;
699		1310
700	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1311	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
701		1312
702	ev_start ((W)w, ++timercnt);	1313	ev_start (EV_A_ (W)w, ++timercnt);
703	array_needsize (timers, timermax, timercnt, );	1314	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
704	timers [timercnt - 1] = w;	1315	timers [timercnt - 1] = w;
705	upheap ((WT *)timers, timercnt - 1);	1316	upheap ((WT *)timers, timercnt - 1);
706	}
707		1317
		1318	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1319	}
		1320
708	void	1321	void
709	evtimer_stop (struct ev_timer *w)	1322	ev_timer_stop (EV_P_ struct ev_timer *w)
710	{	1323	{
711	ev_clear ((W)w);	1324	ev_clear_pending (EV_A_ (W)w);
712	if (!ev_is_active (w))	1325	if (!ev_is_active (w))
713	return;	1326	return;
714		1327
		1328	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1329
715	if (w->active < timercnt--)	1330	if (((W)w)->active < timercnt--)
716	{	1331	{
717	timers [w->active - 1] = timers [timercnt];	1332	timers [((W)w)->active - 1] = timers [timercnt];
718	downheap ((WT *)timers, timercnt, w->active - 1);	1333	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
719	}	1334	}
720		1335
721	w->at = w->repeat;	1336	((WT)w)->at = w->repeat;
722		1337
723	ev_stop ((W)w);	1338	ev_stop (EV_A_ (W)w);
724	}	1339	}
725		1340
726	void	1341	void
727	evtimer_again (struct ev_timer *w)	1342	ev_timer_again (EV_P_ struct ev_timer *w)
728	{	1343	{
729	if (ev_is_active (w))	1344	if (ev_is_active (w))
730	{	1345	{
731	if (w->repeat)	1346	if (w->repeat)
732	{
733	w->at = now + w->repeat;
734	downheap ((WT *)timers, timercnt, w->active - 1);	1347	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
735	}
736	else	1348	else
737	evtimer_stop (w);	1349	ev_timer_stop (EV_A_ w);
738	}	1350	}
739	else if (w->repeat)	1351	else if (w->repeat)
740	evtimer_start (w);	1352	ev_timer_start (EV_A_ w);
741	}	1353	}
742		1354
743	void	1355	void
744	evperiodic_start (struct ev_periodic *w)	1356	ev_periodic_start (EV_P_ struct ev_periodic *w)
745	{	1357	{
746	if (ev_is_active (w))	1358	if (ev_is_active (w))
747	return;	1359	return;
748		1360
749	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1361	if (w->reschedule_cb)
750		1362	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1363	else if (w->interval)
		1364	{
		1365	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
751	/* this formula differs from the one in periodic_reify because we do not always round up */	1366	/* this formula differs from the one in periodic_reify because we do not always round up */
752	if (w->interval)
753	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1367	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1368	}
754		1369
755	ev_start ((W)w, ++periodiccnt);	1370	ev_start (EV_A_ (W)w, ++periodiccnt);
756	array_needsize (periodics, periodicmax, periodiccnt, );	1371	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
757	periodics [periodiccnt - 1] = w;	1372	periodics [periodiccnt - 1] = w;
758	upheap ((WT *)periodics, periodiccnt - 1);	1373	upheap ((WT *)periodics, periodiccnt - 1);
759	}
760		1374
		1375	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1376	}
		1377
761	void	1378	void
762	evperiodic_stop (struct ev_periodic *w)	1379	ev_periodic_stop (EV_P_ struct ev_periodic *w)
763	{	1380	{
764	ev_clear ((W)w);	1381	ev_clear_pending (EV_A_ (W)w);
765	if (!ev_is_active (w))	1382	if (!ev_is_active (w))
766	return;	1383	return;
767		1384
		1385	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1386
768	if (w->active < periodiccnt--)	1387	if (((W)w)->active < periodiccnt--)
769	{	1388	{
770	periodics [w->active - 1] = periodics [periodiccnt];	1389	periodics [((W)w)->active - 1] = periodics [periodiccnt];
771	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1390	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
772	}	1391	}
773		1392
774	ev_stop ((W)w);	1393	ev_stop (EV_A_ (W)w);
775	}	1394	}
776		1395
777	void	1396	void
778	evsignal_start (struct ev_signal *w)	1397	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1398	{
		1399	/* TODO: use adjustheap and recalculation */
		1400	ev_periodic_stop (EV_A_ w);
		1401	ev_periodic_start (EV_A_ w);
		1402	}
		1403
		1404	void
		1405	ev_idle_start (EV_P_ struct ev_idle *w)
779	{	1406	{
780	if (ev_is_active (w))	1407	if (ev_is_active (w))
781	return;	1408	return;
782		1409
		1410	ev_start (EV_A_ (W)w, ++idlecnt);
		1411	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1412	idles [idlecnt - 1] = w;
		1413	}
		1414
		1415	void
		1416	ev_idle_stop (EV_P_ struct ev_idle *w)
		1417	{
		1418	ev_clear_pending (EV_A_ (W)w);
		1419	if (ev_is_active (w))
		1420	return;
		1421
		1422	idles [((W)w)->active - 1] = idles [--idlecnt];
		1423	ev_stop (EV_A_ (W)w);
		1424	}
		1425
		1426	void
		1427	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1428	{
		1429	if (ev_is_active (w))
		1430	return;
		1431
		1432	ev_start (EV_A_ (W)w, ++preparecnt);
		1433	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1434	prepares [preparecnt - 1] = w;
		1435	}
		1436
		1437	void
		1438	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1439	{
		1440	ev_clear_pending (EV_A_ (W)w);
		1441	if (ev_is_active (w))
		1442	return;
		1443
		1444	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1445	ev_stop (EV_A_ (W)w);
		1446	}
		1447
		1448	void
		1449	ev_check_start (EV_P_ struct ev_check *w)
		1450	{
		1451	if (ev_is_active (w))
		1452	return;
		1453
		1454	ev_start (EV_A_ (W)w, ++checkcnt);
		1455	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1456	checks [checkcnt - 1] = w;
		1457	}
		1458
		1459	void
		1460	ev_check_stop (EV_P_ struct ev_check *w)
		1461	{
		1462	ev_clear_pending (EV_A_ (W)w);
		1463	if (ev_is_active (w))
		1464	return;
		1465
		1466	checks [((W)w)->active - 1] = checks [--checkcnt];
		1467	ev_stop (EV_A_ (W)w);
		1468	}
		1469
		1470	#ifndef SA_RESTART
		1471	# define SA_RESTART 0
		1472	#endif
		1473
		1474	void
		1475	ev_signal_start (EV_P_ struct ev_signal *w)
		1476	{
		1477	#if EV_MULTIPLICITY
		1478	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1479	#endif
		1480	if (ev_is_active (w))
		1481	return;
		1482
		1483	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1484
783	ev_start ((W)w, 1);	1485	ev_start (EV_A_ (W)w, 1);
784	array_needsize (signals, signalmax, w->signum, signals_init);	1486	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
785	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1487	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
786		1488
787	if (!w->next)	1489	if (!((WL)w)->next)
788	{	1490	{
		1491	#if WIN32
		1492	signal (w->signum, sighandler);
		1493	#else
789	struct sigaction sa;	1494	struct sigaction sa;
790	sa.sa_handler = sighandler;	1495	sa.sa_handler = sighandler;
791	sigfillset (&sa.sa_mask);	1496	sigfillset (&sa.sa_mask);
792	sa.sa_flags = 0;	1497	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
793	sigaction (w->signum, &sa, 0);	1498	sigaction (w->signum, &sa, 0);
		1499	#endif
794	}	1500	}
795	}	1501	}
796		1502
797	void	1503	void
798	evsignal_stop (struct ev_signal *w)	1504	ev_signal_stop (EV_P_ struct ev_signal *w)
799	{	1505	{
800	ev_clear ((W)w);	1506	ev_clear_pending (EV_A_ (W)w);
801	if (!ev_is_active (w))	1507	if (!ev_is_active (w))
802	return;	1508	return;
803		1509
804	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1510	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
805	ev_stop ((W)w);	1511	ev_stop (EV_A_ (W)w);
806		1512
807	if (!signals [w->signum - 1].head)	1513	if (!signals [w->signum - 1].head)
808	signal (w->signum, SIG_DFL);	1514	signal (w->signum, SIG_DFL);
809	}	1515	}
810		1516
811	void evidle_start (struct ev_idle *w)	1517	void
		1518	ev_child_start (EV_P_ struct ev_child *w)
812	{	1519	{
		1520	#if EV_MULTIPLICITY
		1521	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1522	#endif
813	if (ev_is_active (w))	1523	if (ev_is_active (w))
814	return;	1524	return;
815		1525
816	ev_start ((W)w, ++idlecnt);	1526	ev_start (EV_A_ (W)w, 1);
817	array_needsize (idles, idlemax, idlecnt, );	1527	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
818	idles [idlecnt - 1] = w;
819	}	1528	}
820		1529
821	void evidle_stop (struct ev_idle *w)	1530	void
		1531	ev_child_stop (EV_P_ struct ev_child *w)
822	{	1532	{
823	ev_clear ((W)w);	1533	ev_clear_pending (EV_A_ (W)w);
824	if (ev_is_active (w))	1534	if (ev_is_active (w))
825	return;	1535	return;
826		1536
827	idles [w->active - 1] = idles [--idlecnt];	1537	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
828	ev_stop ((W)w);	1538	ev_stop (EV_A_ (W)w);
829	}
830
831	void evcheck_start (struct ev_check *w)
832	{
833	if (ev_is_active (w))
834	return;
835
836	ev_start ((W)w, ++checkcnt);
837	array_needsize (checks, checkmax, checkcnt, );
838	checks [checkcnt - 1] = w;
839	}
840
841	void evcheck_stop (struct ev_check *w)
842	{
843	ev_clear ((W)w);
844	if (ev_is_active (w))
845	return;
846
847	checks [w->active - 1] = checks [--checkcnt];
848	ev_stop ((W)w);
849	}	1539	}
850		1540
851	/*****************************************************************************/	1541	/*****************************************************************************/
852		1542
853	struct ev_once	1543	struct ev_once
…		…
857	void (*cb)(int revents, void *arg);	1547	void (*cb)(int revents, void *arg);
858	void *arg;	1548	void *arg;
859	};	1549	};
860		1550
861	static void	1551	static void
862	once_cb (struct ev_once *once, int revents)	1552	once_cb (EV_P_ struct ev_once *once, int revents)
863	{	1553	{
864	void (*cb)(int revents, void *arg) = once->cb;	1554	void (*cb)(int revents, void *arg) = once->cb;
865	void *arg = once->arg;	1555	void *arg = once->arg;
866		1556
867	evio_stop (&once->io);	1557	ev_io_stop (EV_A_ &once->io);
868	evtimer_stop (&once->to);	1558	ev_timer_stop (EV_A_ &once->to);
869	free (once);	1559	ev_free (once);
870		1560
871	cb (revents, arg);	1561	cb (revents, arg);
872	}	1562	}
873		1563
874	static void	1564	static void
875	once_cb_io (struct ev_io *w, int revents)	1565	once_cb_io (EV_P_ struct ev_io *w, int revents)
876	{	1566	{
877	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);	1567	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
878	}	1568	}
879		1569
880	static void	1570	static void
881	once_cb_to (struct ev_timer *w, int revents)	1571	once_cb_to (EV_P_ struct ev_timer *w, int revents)
882	{	1572	{
883	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);	1573	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
884	}	1574	}
885		1575
886	void	1576	void
887	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)	1577	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
888	{	1578	{
889	struct ev_once *once = malloc (sizeof (struct ev_once));	1579	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
890		1580
891	if (!once)	1581	if (!once)
892	cb (EV_ERROR, arg);	1582	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
893	else	1583	else
894	{	1584	{
895	once->cb = cb;	1585	once->cb = cb;
896	once->arg = arg;	1586	once->arg = arg;
897		1587
898	evw_init (&once->io, once_cb_io);	1588	ev_init (&once->io, once_cb_io);
899
900	if (fd >= 0)	1589	if (fd >= 0)
901	{	1590	{
902	evio_set (&once->io, fd, events);	1591	ev_io_set (&once->io, fd, events);
903	evio_start (&once->io);	1592	ev_io_start (EV_A_ &once->io);
904	}	1593	}
905		1594
906	evw_init (&once->to, once_cb_to);	1595	ev_init (&once->to, once_cb_to);
907
908	if (timeout >= 0.)	1596	if (timeout >= 0.)
909	{	1597	{
910	evtimer_set (&once->to, timeout, 0.);	1598	ev_timer_set (&once->to, timeout, 0.);
911	evtimer_start (&once->to);	1599	ev_timer_start (EV_A_ &once->to);
912	}	1600	}
913	}	1601	}
914	}	1602	}
915		1603
916	/*****************************************************************************/	1604	#ifdef __cplusplus
917
918	#if 0
919
920	struct ev_io wio;
921
922	static void
923	sin_cb (struct ev_io *w, int revents)
924	{
925	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
926	}	1605	}
927
928	static void
929	ocb (struct ev_timer *w, int revents)
930	{
931	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
932	evtimer_stop (w);
933	evtimer_start (w);
934	}
935
936	static void
937	scb (struct ev_signal *w, int revents)
938	{
939	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
940	evio_stop (&wio);
941	evio_start (&wio);
942	}
943
944	static void
945	gcb (struct ev_signal *w, int revents)
946	{
947	fprintf (stderr, "generic %x\n", revents);
948
949	}
950
951	int main (void)
952	{
953	ev_init (0);
954
955	evio_init (&wio, sin_cb, 0, EV_READ);
956	evio_start (&wio);
957
958	struct ev_timer t[10000];
959
960	#if 0
961	int i;
962	for (i = 0; i < 10000; ++i)
963	{
964	struct ev_timer *w = t + i;
965	evw_init (w, ocb, i);
966	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
967	evtimer_start (w);
968	if (drand48 () < 0.5)
969	evtimer_stop (w);
970	}
971	#endif	1606	#endif
972		1607
973	struct ev_timer t1;
974	evtimer_init (&t1, ocb, 5, 10);
975	evtimer_start (&t1);
976
977	struct ev_signal sig;
978	evsignal_init (&sig, scb, SIGQUIT);
979	evsignal_start (&sig);
980
981	struct ev_check cw;
982	evcheck_init (&cw, gcb);
983	evcheck_start (&cw);
984
985	struct ev_idle iw;
986	evidle_init (&iw, gcb);
987	evidle_start (&iw);
988
989	ev_loop (0);
990
991	return 0;
992	}
993
994	#endif
995
996
997
998

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