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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.116 by root, Thu Nov 15 09:19:42 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	68	#include <fcntl.h>
5	#include <signal.h>	69	#include <stddef.h>
6		70
7	#include <stdio.h>	71	#include <stdio.h>
8		72
9	#include <assert.h>	73	#include <assert.h>
10	#include <errno.h>	74	#include <errno.h>
11	#include <sys/time.h>	75	#include <sys/types.h>
12	#include <time.h>	76	#include <time.h>
13		77
		78	#include <signal.h>
		79
		80	#ifndef _WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#else
		85	# define WIN32_LEAN_AND_MEAN
		86	# include <windows.h>
		87	# ifndef EV_SELECT_IS_WINSOCKET
		88	# define EV_SELECT_IS_WINSOCKET 1
		89	# endif
		90	#endif
		91
		92	/**/
		93
		94	#ifndef EV_USE_MONOTONIC
		95	# define EV_USE_MONOTONIC 1
		96	#endif
		97
		98	#ifndef EV_USE_SELECT
		99	# define EV_USE_SELECT 1
		100	# define EV_SELECT_USE_FD_SET 1
		101	#endif
		102
		103	#ifndef EV_USE_POLL
		104	# ifdef _WIN32
		105	# define EV_USE_POLL 0
		106	# else
		107	# define EV_USE_POLL 1
		108	# endif
		109	#endif
		110
		111	#ifndef EV_USE_EPOLL
		112	# define EV_USE_EPOLL 0
		113	#endif
		114
		115	#ifndef EV_USE_KQUEUE
		116	# define EV_USE_KQUEUE 0
		117	#endif
		118
		119	#ifndef EV_USE_REALTIME
		120	# define EV_USE_REALTIME 1
		121	#endif
		122
		123	/**/
		124
		125	/* darwin simply cannot be helped */
		126	#ifdef __APPLE__
		127	# undef EV_USE_POLL
		128	# undef EV_USE_KQUEUE
		129	#endif
		130
14	#ifdef CLOCK_MONOTONIC	131	#ifndef CLOCK_MONOTONIC
		132	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	133	# define EV_USE_MONOTONIC 0
16	#endif	134	#endif
17		135
		136	#ifndef CLOCK_REALTIME
		137	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	138	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	139	#endif
20	#define HAVE_SELECT 1	140
		141	#if EV_SELECT_IS_WINSOCKET
		142	# include <winsock.h>
		143	#endif
		144
		145	/**/
21		146
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	147	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	148	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		149	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		150	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
24		151
		152	#ifdef EV_H
		153	# include EV_H
		154	#else
25	#include "ev.h"	155	# include "ev.h"
		156	#endif
26		157
		158	#if __GNUC__ >= 3
		159	# define expect(expr,value) __builtin_expect ((expr),(value))
		160	# define inline inline
		161	#else
		162	# define expect(expr,value) (expr)
		163	# define inline static
		164	#endif
		165
		166	#define expect_false(expr) expect ((expr) != 0, 0)
		167	#define expect_true(expr) expect ((expr) != 0, 1)
		168
		169	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		170	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		171
		172	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		173	#define EMPTY2(a,b) /* used to suppress some warnings */
		174
27	struct ev_watcher {	175	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	176	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	177	typedef struct ev_watcher_time *WT;
33	};
34		178
35	static ev_tstamp now, diff; /* monotonic clock */	179	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		180
		181	#ifdef _WIN32
		182	# include "ev_win32.c"
		183	#endif
		184
		185	/*****************************************************************************/
		186
		187	static void (*syserr_cb)(const char *msg);
		188
		189	void ev_set_syserr_cb (void (*cb)(const char *msg))
		190	{
		191	syserr_cb = cb;
		192	}
		193
		194	static void
		195	syserr (const char *msg)
		196	{
		197	if (!msg)
		198	msg = "(libev) system error";
		199
		200	if (syserr_cb)
		201	syserr_cb (msg);
		202	else
		203	{
		204	perror (msg);
		205	abort ();
		206	}
		207	}
		208
		209	static void *(*alloc)(void *ptr, long size);
		210
		211	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		212	{
		213	alloc = cb;
		214	}
		215
		216	static void *
		217	ev_realloc (void *ptr, long size)
		218	{
		219	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		220
		221	if (!ptr && size)
		222	{
		223	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		224	abort ();
		225	}
		226
		227	return ptr;
		228	}
		229
		230	#define ev_malloc(size) ev_realloc (0, (size))
		231	#define ev_free(ptr) ev_realloc ((ptr), 0)
		232
		233	/*****************************************************************************/
		234
		235	typedef struct
		236	{
		237	WL head;
		238	unsigned char events;
		239	unsigned char reify;
		240	#if EV_SELECT_IS_WINSOCKET
		241	SOCKET handle;
		242	#endif
		243	} ANFD;
		244
		245	typedef struct
		246	{
		247	W w;
		248	int events;
		249	} ANPENDING;
		250
		251	#if EV_MULTIPLICITY
		252
		253	struct ev_loop
		254	{
		255	ev_tstamp ev_rt_now;
		256	#define ev_rt_now ((loop)->ev_rt_now)
		257	#define VAR(name,decl) decl;
		258	#include "ev_vars.h"
		259	#undef VAR
		260	};
		261	#include "ev_wrap.h"
		262
		263	static struct ev_loop default_loop_struct;
		264	struct ev_loop *ev_default_loop_ptr;
		265
		266	#else
		267
36	ev_tstamp ev_now;	268	ev_tstamp ev_rt_now;
37	int ev_method;	269	#define VAR(name,decl) static decl;
		270	#include "ev_vars.h"
		271	#undef VAR
38		272
39	static int have_monotonic; /* runtime */	273	static int ev_default_loop_ptr;
40		274
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	275	#endif
42	static void (*method_modify)(int fd, int oev, int nev);	276
43	static void (*method_poll)(ev_tstamp timeout);	277	/*****************************************************************************/
44		278
45	ev_tstamp	279	ev_tstamp
46	ev_time (void)	280	ev_time (void)
47	{	281	{
48	#if HAVE_REALTIME	282	#if EV_USE_REALTIME
49	struct timespec ts;	283	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	284	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	285	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	286	#else
53	struct timeval tv;	287	struct timeval tv;
54	gettimeofday (&tv, 0);	288	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	289	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	290	#endif
57	}	291	}
58		292
59	static ev_tstamp	293	inline ev_tstamp
60	get_clock (void)	294	get_clock (void)
61	{	295	{
62	#if HAVE_MONOTONIC	296	#if EV_USE_MONOTONIC
63	if (have_monotonic)	297	if (expect_true (have_monotonic))
64	{	298	{
65	struct timespec ts;	299	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	300	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	301	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	302	}
69	#endif	303	#endif
70		304
71	return ev_time ();	305	return ev_time ();
72	}	306	}
73		307
		308	#if EV_MULTIPLICITY
		309	ev_tstamp
		310	ev_now (EV_P)
		311	{
		312	return ev_rt_now;
		313	}
		314	#endif
		315
		316	#define array_roundsize(type,n) (((n) | 4) & ~3)
		317
74	#define array_needsize(base,cur,cnt,init) \	318	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	319	if (expect_false ((cnt) > cur)) \
76	{ \	320	{ \
77	int newcnt = cur ? cur << 1 : 16; \	321	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	322	do \
		323	{ \
		324	newcnt = array_roundsize (type, newcnt << 1); \
		325	} \
		326	while ((cnt) > newcnt); \
		327	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	328	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
80	init (base + cur, newcnt - cur); \	329	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	330	cur = newcnt; \
82	}	331	}
83		332
84	typedef struct	333	#define array_slim(type,stem) \
85	{	334	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	335	{ \
87	unsigned char wev, rev; /* want, received event set */	336	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	337	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		338	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		339	}
89		340
90	static ANFD *anfds;	341	#define array_free(stem, idx) \
91	static int anfdmax;	342	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
92		343
93	static int *fdchanges;	344	/*****************************************************************************/
94	static int fdchangemax, fdchangecnt;
95		345
96	static void	346	static void
97	anfds_init (ANFD *base, int count)	347	anfds_init (ANFD *base, int count)
98	{	348	{
99	while (count--)	349	while (count--)
100	{	350	{
101	base->head = 0;	351	base->head = 0;
102	base->wev = base->rev = EV_NONE;	352	base->events = EV_NONE;
		353	base->reify = 0;
		354
103	++base;	355	++base;
104	}	356	}
105	}	357	}
106		358
107	typedef struct	359	void
		360	ev_feed_event (EV_P_ void *w, int revents)
108	{	361	{
109	struct ev_watcher *w;	362	W w_ = (W)w;
110	int events;
111	} ANPENDING;
112		363
113	static ANPENDING *pendings;	364	if (w_->pending)
114	static int pendingmax, pendingcnt;	365	{
		366	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		367	return;
		368	}
115		369
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;	370	w_->pending = ++pendingcnt [ABSPRI (w_)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	371	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
121	pendings [pendingcnt - 1].w = w;	372	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
122	pendings [pendingcnt - 1].events = events;	373	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
123	}	374	}
124		375
125	static void	376	static void
		377	queue_events (EV_P_ W *events, int eventcnt, int type)
		378	{
		379	int i;
		380
		381	for (i = 0; i < eventcnt; ++i)
		382	ev_feed_event (EV_A_ events [i], type);
		383	}
		384
		385	inline void
126	fd_event (int fd, int events)	386	fd_event (EV_P_ int fd, int revents)
127	{	387	{
128	ANFD *anfd = anfds + fd;	388	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	389	struct ev_io *w;
130		390
131	for (w = anfd->head; w; w = w->next)	391	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	392	{
133	int ev = w->events & events;	393	int ev = w->events & revents;
134		394
135	if (ev)	395	if (ev)
136	event ((struct ev_watcher *)w, ev);	396	ev_feed_event (EV_A_ (W)w, ev);
137	}
138	}
139
140	static struct ev_timer **atimers;
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void
147	upheap (struct ev_timer **timers, int k)
148	{
149	struct ev_timer *w = timers [k];
150
151	while (k && timers [k >> 1]->at > w->at)
152	{
153	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;
155	k >>= 1;
156	}
157
158	timers [k] = w;
159	timers [k]->active = k + 1;
160
161	}
162
163	static void
164	downheap (struct ev_timer **timers, int N, int k)
165	{
166	struct ev_timer *w = timers [k];
167
168	while (k < (N >> 1))
169	{
170	int j = k << 1;
171
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173	++j;
174
175	if (w->at <= timers [j]->at)
176	break;
177
178	timers [k] = timers [j];
179	timers [k]->active = k + 1;
180	k = j;
181	}
182
183	timers [k] = w;
184	timers [k]->active = k + 1;
185	}
186
187	typedef struct
188	{
189	struct ev_signal *head;
190	sig_atomic_t gotsig;
191	} ANSIG;
192
193	static ANSIG *signals;
194	static int signalmax;
195
196	static int sigpipe [2];
197	static sig_atomic_t gotsig;
198	static struct ev_io sigev;
199
200	static void
201	signals_init (ANSIG *base, int count)
202	{
203	while (count--)
204	{
205	base->head = 0;
206	base->gotsig = 0;
207	++base;
208	}
209	}
210
211	static void
212	sighandler (int signum)
213	{
214	signals [signum - 1].gotsig = 1;
215
216	if (!gotsig)
217	{
218	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);
220	}
221	}
222
223	static void
224	sigcb (struct ev_io *iow, int revents)
225	{
226	struct ev_signal *w;
227	int sig;
228
229	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231
232	for (sig = signalmax; sig--; )
233	if (signals [sig].gotsig)
234	{
235	signals [sig].gotsig = 0;
236
237	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);
239	}	397	}
240	}	398	}
241		399
242	static void	400	void
243	siginit (void)	401	ev_feed_fd_event (EV_P_ int fd, int revents)
244	{	402	{
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	403	fd_event (EV_A_ fd, revents);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247
248	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251
252	evio_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);
254	}	404	}
255		405
256	#if HAVE_EPOLL	406	/*****************************************************************************/
257	# include "ev_epoll.c"
258	#endif
259	#if HAVE_SELECT
260	# include "ev_select.c"
261	#endif
262		407
263	int ev_init (int flags)
264	{
265	#if HAVE_MONOTONIC
266	{
267	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;
270	}
271	#endif
272
273	ev_now = ev_time ();
274	now = get_clock ();
275	diff = ev_now - now;
276
277	if (pipe (sigpipe))
278	return 0;
279
280	ev_method = EVMETHOD_NONE;
281	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif
284	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif
287
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);
291	siginit ();
292	}
293
294	return ev_method;
295	}
296
297	void ev_prefork (void)
298	{
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void	408	static void
320	fd_reify (void)	409	fd_reify (EV_P)
321	{	410	{
322	int i;	411	int i;
323		412
324	for (i = 0; i < fdchangecnt; ++i)	413	for (i = 0; i < fdchangecnt; ++i)
325	{	414	{
326	int fd = fdchanges [i];	415	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;	416	ANFD *anfd = anfds + fd;
328	struct ev_io *w;	417	struct ev_io *w;
329		418
330	int wev = 0;	419	int events = 0;
331		420
332	for (w = anfd->head; w; w = w->next)	421	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
333	wev |= w->events;	422	events |= w->events;
334		423
335	if (anfd->wev != wev)	424	#if EV_SELECT_IS_WINSOCKET
		425	if (events)
336	{	426	{
337	method_modify (fd, anfd->wev, wev);	427	unsigned long argp;
338	anfd->wev = wev;	428	anfd->handle = _get_osfhandle (fd);
		429	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
339	}	430	}
		431	#endif
		432
		433	anfd->reify = 0;
		434
		435	method_modify (EV_A_ fd, anfd->events, events);
		436	anfd->events = events;
340	}	437	}
341		438
342	fdchangecnt = 0;	439	fdchangecnt = 0;
343	}	440	}
344		441
345	static void	442	static void
346	call_pending ()	443	fd_change (EV_P_ int fd)
		444	{
		445	if (anfds [fd].reify)
		446	return;
		447
		448	anfds [fd].reify = 1;
		449
		450	++fdchangecnt;
		451	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		452	fdchanges [fdchangecnt - 1] = fd;
		453	}
		454
		455	static void
		456	fd_kill (EV_P_ int fd)
		457	{
		458	struct ev_io *w;
		459
		460	while ((w = (struct ev_io *)anfds [fd].head))
		461	{
		462	ev_io_stop (EV_A_ w);
		463	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		464	}
		465	}
		466
		467	static int
		468	fd_valid (int fd)
		469	{
		470	#ifdef _WIN32
		471	return _get_osfhandle (fd) != -1;
		472	#else
		473	return fcntl (fd, F_GETFD) != -1;
		474	#endif
		475	}
		476
		477	/* called on EBADF to verify fds */
		478	static void
		479	fd_ebadf (EV_P)
		480	{
		481	int fd;
		482
		483	for (fd = 0; fd < anfdmax; ++fd)
		484	if (anfds [fd].events)
		485	if (!fd_valid (fd) == -1 && errno == EBADF)
		486	fd_kill (EV_A_ fd);
		487	}
		488
		489	/* called on ENOMEM in select/poll to kill some fds and retry */
		490	static void
		491	fd_enomem (EV_P)
		492	{
		493	int fd;
		494
		495	for (fd = anfdmax; fd--; )
		496	if (anfds [fd].events)
		497	{
		498	fd_kill (EV_A_ fd);
		499	return;
		500	}
		501	}
		502
		503	/* usually called after fork if method needs to re-arm all fds from scratch */
		504	static void
		505	fd_rearm_all (EV_P)
		506	{
		507	int fd;
		508
		509	/* this should be highly optimised to not do anything but set a flag */
		510	for (fd = 0; fd < anfdmax; ++fd)
		511	if (anfds [fd].events)
		512	{
		513	anfds [fd].events = 0;
		514	fd_change (EV_A_ fd);
		515	}
		516	}
		517
		518	/*****************************************************************************/
		519
		520	static void
		521	upheap (WT *heap, int k)
		522	{
		523	WT w = heap [k];
		524
		525	while (k && heap [k >> 1]->at > w->at)
		526	{
		527	heap [k] = heap [k >> 1];
		528	((W)heap [k])->active = k + 1;
		529	k >>= 1;
		530	}
		531
		532	heap [k] = w;
		533	((W)heap [k])->active = k + 1;
		534
		535	}
		536
		537	static void
		538	downheap (WT *heap, int N, int k)
		539	{
		540	WT w = heap [k];
		541
		542	while (k < (N >> 1))
		543	{
		544	int j = k << 1;
		545
		546	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		547	++j;
		548
		549	if (w->at <= heap [j]->at)
		550	break;
		551
		552	heap [k] = heap [j];
		553	((W)heap [k])->active = k + 1;
		554	k = j;
		555	}
		556
		557	heap [k] = w;
		558	((W)heap [k])->active = k + 1;
		559	}
		560
		561	inline void
		562	adjustheap (WT *heap, int N, int k)
		563	{
		564	upheap (heap, k);
		565	downheap (heap, N, k);
		566	}
		567
		568	/*****************************************************************************/
		569
		570	typedef struct
		571	{
		572	WL head;
		573	sig_atomic_t volatile gotsig;
		574	} ANSIG;
		575
		576	static ANSIG *signals;
		577	static int signalmax;
		578
		579	static int sigpipe [2];
		580	static sig_atomic_t volatile gotsig;
		581	static struct ev_io sigev;
		582
		583	static void
		584	signals_init (ANSIG *base, int count)
		585	{
		586	while (count--)
		587	{
		588	base->head = 0;
		589	base->gotsig = 0;
		590
		591	++base;
		592	}
		593	}
		594
		595	static void
		596	sighandler (int signum)
		597	{
		598	#if _WIN32
		599	signal (signum, sighandler);
		600	#endif
		601
		602	signals [signum - 1].gotsig = 1;
		603
		604	if (!gotsig)
		605	{
		606	int old_errno = errno;
		607	gotsig = 1;
		608	write (sigpipe [1], &signum, 1);
		609	errno = old_errno;
		610	}
		611	}
		612
		613	void
		614	ev_feed_signal_event (EV_P_ int signum)
		615	{
		616	WL w;
		617
		618	#if EV_MULTIPLICITY
		619	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		620	#endif
		621
		622	--signum;
		623
		624	if (signum < 0 || signum >= signalmax)
		625	return;
		626
		627	signals [signum].gotsig = 0;
		628
		629	for (w = signals [signum].head; w; w = w->next)
		630	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		631	}
		632
		633	static void
		634	sigcb (EV_P_ struct ev_io *iow, int revents)
		635	{
		636	int signum;
		637
		638	read (sigpipe [0], &revents, 1);
		639	gotsig = 0;
		640
		641	for (signum = signalmax; signum--; )
		642	if (signals [signum].gotsig)
		643	ev_feed_signal_event (EV_A_ signum + 1);
		644	}
		645
		646	inline void
		647	fd_intern (int fd)
		648	{
		649	#ifdef _WIN32
		650	int arg = 1;
		651	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		652	#else
		653	fcntl (fd, F_SETFD, FD_CLOEXEC);
		654	fcntl (fd, F_SETFL, O_NONBLOCK);
		655	#endif
		656	}
		657
		658	static void
		659	siginit (EV_P)
		660	{
		661	fd_intern (sigpipe [0]);
		662	fd_intern (sigpipe [1]);
		663
		664	ev_io_set (&sigev, sigpipe [0], EV_READ);
		665	ev_io_start (EV_A_ &sigev);
		666	ev_unref (EV_A); /* child watcher should not keep loop alive */
		667	}
		668
		669	/*****************************************************************************/
		670
		671	static struct ev_child *childs [PID_HASHSIZE];
		672
		673	#ifndef _WIN32
		674
		675	static struct ev_signal childev;
		676
		677	#ifndef WCONTINUED
		678	# define WCONTINUED 0
		679	#endif
		680
		681	static void
		682	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		683	{
		684	struct ev_child *w;
		685
		686	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		687	if (w->pid == pid || !w->pid)
		688	{
		689	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		690	w->rpid = pid;
		691	w->rstatus = status;
		692	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		693	}
		694	}
		695
		696	static void
		697	childcb (EV_P_ struct ev_signal *sw, int revents)
		698	{
		699	int pid, status;
		700
		701	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		702	{
		703	/* make sure we are called again until all childs have been reaped */
		704	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		705
		706	child_reap (EV_A_ sw, pid, pid, status);
		707	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		708	}
		709	}
		710
		711	#endif
		712
		713	/*****************************************************************************/
		714
		715	#if EV_USE_KQUEUE
		716	# include "ev_kqueue.c"
		717	#endif
		718	#if EV_USE_EPOLL
		719	# include "ev_epoll.c"
		720	#endif
		721	#if EV_USE_POLL
		722	# include "ev_poll.c"
		723	#endif
		724	#if EV_USE_SELECT
		725	# include "ev_select.c"
		726	#endif
		727
		728	int
		729	ev_version_major (void)
		730	{
		731	return EV_VERSION_MAJOR;
		732	}
		733
		734	int
		735	ev_version_minor (void)
		736	{
		737	return EV_VERSION_MINOR;
		738	}
		739
		740	/* return true if we are running with elevated privileges and should ignore env variables */
		741	static int
		742	enable_secure (void)
		743	{
		744	#ifdef _WIN32
		745	return 0;
		746	#else
		747	return getuid () != geteuid ()
		748	|| getgid () != getegid ();
		749	#endif
		750	}
		751
		752	unsigned int
		753	ev_method (EV_P)
		754	{
		755	return method;
		756	}
		757
		758	static void
		759	loop_init (EV_P_ unsigned int flags)
		760	{
		761	if (!method)
		762	{
		763	#if EV_USE_MONOTONIC
		764	{
		765	struct timespec ts;
		766	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		767	have_monotonic = 1;
		768	}
		769	#endif
		770
		771	ev_rt_now = ev_time ();
		772	mn_now = get_clock ();
		773	now_floor = mn_now;
		774	rtmn_diff = ev_rt_now - mn_now;
		775
		776	if (!(flags & EVFLAG_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		777	flags = atoi (getenv ("LIBEV_FLAGS"));
		778
		779	if (!(flags & 0x0000ffff))
		780	flags |= 0x0000ffff;
		781
		782	method = 0;
		783	#if EV_USE_KQUEUE
		784	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		785	#endif
		786	#if EV_USE_EPOLL
		787	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
		788	#endif
		789	#if EV_USE_POLL
		790	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		791	#endif
		792	#if EV_USE_SELECT
		793	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
		794	#endif
		795
		796	ev_init (&sigev, sigcb);
		797	ev_set_priority (&sigev, EV_MAXPRI);
		798	}
		799	}
		800
		801	void
		802	loop_destroy (EV_P)
347	{	803	{
348	int i;	804	int i;
349		805
350	for (i = 0; i < pendingcnt; ++i)	806	#if EV_USE_KQUEUE
		807	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		808	#endif
		809	#if EV_USE_EPOLL
		810	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		811	#endif
		812	#if EV_USE_POLL
		813	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		814	#endif
		815	#if EV_USE_SELECT
		816	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		817	#endif
		818
		819	for (i = NUMPRI; i--; )
		820	array_free (pending, [i]);
		821
		822	/* have to use the microsoft-never-gets-it-right macro */
		823	array_free (fdchange, EMPTY0);
		824	array_free (timer, EMPTY0);
		825	#if EV_PERIODICS
		826	array_free (periodic, EMPTY0);
		827	#endif
		828	array_free (idle, EMPTY0);
		829	array_free (prepare, EMPTY0);
		830	array_free (check, EMPTY0);
		831
		832	method = 0;
		833	}
		834
		835	static void
		836	loop_fork (EV_P)
		837	{
		838	#if EV_USE_EPOLL
		839	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		840	#endif
		841	#if EV_USE_KQUEUE
		842	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		843	#endif
		844
		845	if (ev_is_active (&sigev))
		846	{
		847	/* default loop */
		848
		849	ev_ref (EV_A);
		850	ev_io_stop (EV_A_ &sigev);
		851	close (sigpipe [0]);
		852	close (sigpipe [1]);
		853
		854	while (pipe (sigpipe))
		855	syserr ("(libev) error creating pipe");
		856
		857	siginit (EV_A);
351	{	858	}
352	ANPENDING *p = pendings + i;
353		859
354	if (p->w)	860	postfork = 0;
		861	}
		862
		863	#if EV_MULTIPLICITY
		864	struct ev_loop *
		865	ev_loop_new (unsigned int flags)
		866	{
		867	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		868
		869	memset (loop, 0, sizeof (struct ev_loop));
		870
		871	loop_init (EV_A_ flags);
		872
		873	if (ev_method (EV_A))
		874	return loop;
		875
		876	return 0;
		877	}
		878
		879	void
		880	ev_loop_destroy (EV_P)
		881	{
		882	loop_destroy (EV_A);
		883	ev_free (loop);
		884	}
		885
		886	void
		887	ev_loop_fork (EV_P)
		888	{
		889	postfork = 1;
		890	}
		891
		892	#endif
		893
		894	#if EV_MULTIPLICITY
		895	struct ev_loop *
		896	ev_default_loop_ (unsigned int flags)
		897	#else
		898	int
		899	ev_default_loop (unsigned int flags)
		900	#endif
		901	{
		902	if (sigpipe [0] == sigpipe [1])
		903	if (pipe (sigpipe))
		904	return 0;
		905
		906	if (!ev_default_loop_ptr)
		907	{
		908	#if EV_MULTIPLICITY
		909	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		910	#else
		911	ev_default_default_loop_ptr = 1;
		912	#endif
		913
		914	loop_init (EV_A_ flags);
		915
		916	if (ev_method (EV_A))
355	{	917	{
356	p->w->pending = 0;	918	siginit (EV_A);
357	p->w->cb (p->w, p->events);	919
		920	#ifndef _WIN32
		921	ev_signal_init (&childev, childcb, SIGCHLD);
		922	ev_set_priority (&childev, EV_MAXPRI);
		923	ev_signal_start (EV_A_ &childev);
		924	ev_unref (EV_A); /* child watcher should not keep loop alive */
		925	#endif
358	}	926	}
		927	else
		928	ev_default_loop_ptr = 0;
		929	}
		930
		931	return ev_default_loop_ptr;
		932	}
		933
		934	void
		935	ev_default_destroy (void)
		936	{
		937	#if EV_MULTIPLICITY
		938	struct ev_loop *loop = ev_default_loop_ptr;
		939	#endif
		940
		941	#ifndef _WIN32
		942	ev_ref (EV_A); /* child watcher */
		943	ev_signal_stop (EV_A_ &childev);
		944	#endif
		945
		946	ev_ref (EV_A); /* signal watcher */
		947	ev_io_stop (EV_A_ &sigev);
		948
		949	close (sigpipe [0]); sigpipe [0] = 0;
		950	close (sigpipe [1]); sigpipe [1] = 0;
		951
		952	loop_destroy (EV_A);
		953	}
		954
		955	void
		956	ev_default_fork (void)
		957	{
		958	#if EV_MULTIPLICITY
		959	struct ev_loop *loop = ev_default_loop_ptr;
		960	#endif
		961
		962	if (method)
		963	postfork = 1;
		964	}
		965
		966	/*****************************************************************************/
		967
		968	static int
		969	any_pending (EV_P)
		970	{
		971	int pri;
		972
		973	for (pri = NUMPRI; pri--; )
		974	if (pendingcnt [pri])
		975	return 1;
		976
		977	return 0;
		978	}
		979
		980	static void
		981	call_pending (EV_P)
		982	{
		983	int pri;
		984
		985	for (pri = NUMPRI; pri--; )
		986	while (pendingcnt [pri])
		987	{
		988	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		989
		990	if (p->w)
		991	{
		992	p->w->pending = 0;
		993	EV_CB_INVOKE (p->w, p->events);
		994	}
359	}	995	}
360
361	pendingcnt = 0;
362	}	996	}
363		997
364	static void	998	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	999	timers_reify (EV_P)
366	{	1000	{
367	while (timercnt && timers [0]->at <= now)	1001	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	1002	{
369	struct ev_timer *w = timers [0];	1003	struct ev_timer *w = timers [0];
		1004
		1005	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		1006
371	/* first reschedule or stop timer */	1007	/* first reschedule or stop timer */
372	if (w->repeat)	1008	if (w->repeat)
373	{	1009	{
374	if (w->is_abs)	1010	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1011
376	else
377	w->at = now + w->repeat;	1012	((WT)w)->at += w->repeat;
		1013	if (((WT)w)->at < mn_now)
		1014	((WT)w)->at = mn_now;
378		1015
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	1016	downheap ((WT *)timers, timercnt, 0);
382	}	1017	}
383	else	1018	else
		1019	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1020
		1021	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1022	}
		1023	}
		1024
		1025	#if EV_PERIODICS
		1026	static void
		1027	periodics_reify (EV_P)
		1028	{
		1029	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1030	{
		1031	struct ev_periodic *w = periodics [0];
		1032
		1033	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1034
		1035	/* first reschedule or stop timer */
		1036	if (w->reschedule_cb)
384	{	1037	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	1038	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
386	--timercnt; /* maybe pass by reference instead? */	1039	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1040	downheap ((WT *)periodics, periodiccnt, 0);
387	}	1041	}
		1042	else if (w->interval)
		1043	{
		1044	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1045	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1046	downheap ((WT *)periodics, periodiccnt, 0);
		1047	}
		1048	else
		1049	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1050
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1051	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1052	}
391	}	1053	}
392		1054
393	static void	1055	static void
394	time_update ()	1056	periodics_reschedule (EV_P)
395	{	1057	{
396	int i;	1058	int i;
		1059
		1060	/* adjust periodics after time jump */
		1061	for (i = 0; i < periodiccnt; ++i)
		1062	{
		1063	struct ev_periodic *w = periodics [i];
		1064
		1065	if (w->reschedule_cb)
		1066	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1067	else if (w->interval)
		1068	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1069	}
		1070
		1071	/* now rebuild the heap */
		1072	for (i = periodiccnt >> 1; i--; )
		1073	downheap ((WT *)periodics, periodiccnt, i);
		1074	}
		1075	#endif
		1076
		1077	inline int
		1078	time_update_monotonic (EV_P)
		1079	{
		1080	mn_now = get_clock ();
		1081
		1082	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1083	{
		1084	ev_rt_now = rtmn_diff + mn_now;
		1085	return 0;
		1086	}
		1087	else
		1088	{
		1089	now_floor = mn_now;
397	ev_now = ev_time ();	1090	ev_rt_now = ev_time ();
398		1091	return 1;
399	if (have_monotonic)
400	{	1092	}
401	ev_tstamp odiff = diff;	1093	}
402		1094
403	/* detecting time jumps is much more difficult */	1095	static void
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1096	time_update (EV_P)
		1097	{
		1098	int i;
		1099
		1100	#if EV_USE_MONOTONIC
		1101	if (expect_true (have_monotonic))
		1102	{
		1103	if (time_update_monotonic (EV_A))
405	{	1104	{
406	now = get_clock ();	1105	ev_tstamp odiff = rtmn_diff;
		1106
		1107	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1108	{
407	diff = ev_now - now;	1109	rtmn_diff = ev_rt_now - mn_now;
408		1110
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1111	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1112	return; /* all is well */
411		1113
412	ev_now = ev_time ();	1114	ev_rt_now = ev_time ();
		1115	mn_now = get_clock ();
		1116	now_floor = mn_now;
		1117	}
		1118
		1119	# if EV_PERIODICS
		1120	periodics_reschedule (EV_A);
		1121	# endif
		1122	/* no timer adjustment, as the monotonic clock doesn't jump */
		1123	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
413	}	1124	}
		1125	}
		1126	else
		1127	#endif
		1128	{
		1129	ev_rt_now = ev_time ();
414		1130
415	/* time jump detected, reschedule atimers */	1131	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
416	for (i = 0; i < atimercnt; ++i)
417	{	1132	{
418	struct ev_timer *w = atimers [i];	1133	#if EV_PERIODICS
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1134	periodics_reschedule (EV_A);
		1135	#endif
		1136
		1137	/* adjust timers. this is easy, as the offset is the same for all */
		1138	for (i = 0; i < timercnt; ++i)
		1139	((WT)timers [i])->at += ev_rt_now - mn_now;
420	}	1140	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1141
429	now = ev_now;	1142	mn_now = ev_rt_now;
430	}	1143	}
431	}	1144	}
432		1145
433	int ev_loop_done;	1146	void
		1147	ev_ref (EV_P)
		1148	{
		1149	++activecnt;
		1150	}
434		1151
		1152	void
		1153	ev_unref (EV_P)
		1154	{
		1155	--activecnt;
		1156	}
		1157
		1158	static int loop_done;
		1159
		1160	void
435	void ev_loop (int flags)	1161	ev_loop (EV_P_ int flags)
436	{	1162	{
437	double block;	1163	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1164	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		1165
440	do	1166	while (activecnt)
441	{	1167	{
		1168	/* queue check watchers (and execute them) */
		1169	if (expect_false (preparecnt))
		1170	{
		1171	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1172	call_pending (EV_A);
		1173	}
		1174
		1175	/* we might have forked, so reify kernel state if necessary */
		1176	if (expect_false (postfork))
		1177	loop_fork (EV_A);
		1178
442	/* update fd-related kernel structures */	1179	/* update fd-related kernel structures */
443	fd_reify ();	1180	fd_reify (EV_A);
444		1181
445	/* calculate blocking time */	1182	/* calculate blocking time */
		1183
		1184	/* we only need this for !monotonic clock or timers, but as we basically
		1185	always have timers, we just calculate it always */
		1186	#if EV_USE_MONOTONIC
		1187	if (expect_true (have_monotonic))
		1188	time_update_monotonic (EV_A);
		1189	else
		1190	#endif
		1191	{
		1192	ev_rt_now = ev_time ();
		1193	mn_now = ev_rt_now;
		1194	}
		1195
446	if (flags & EVLOOP_NONBLOCK)	1196	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1197	block = 0.;
448	else	1198	else
449	{	1199	{
450	block = MAX_BLOCKTIME;	1200	block = MAX_BLOCKTIME;
451		1201
452	if (rtimercnt)	1202	if (timercnt)
453	{	1203	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1204	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
455	if (block > to) block = to;	1205	if (block > to) block = to;
456	}	1206	}
457		1207
		1208	#if EV_PERIODICS
458	if (atimercnt)	1209	if (periodiccnt)
459	{	1210	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1211	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
461	if (block > to) block = to;	1212	if (block > to) block = to;
462	}	1213	}
		1214	#endif
463		1215
464	if (block < 0.) block = 0.;	1216	if (block < 0.) block = 0.;
465	}	1217	}
466		1218
467	method_poll (block);	1219	method_poll (EV_A_ block);
468		1220
469	/* update ev_now, do magic */	1221	/* update ev_rt_now, do magic */
470	time_update ();	1222	time_update (EV_A);
471		1223
472	/* put pending timers into pendign queue and reschedule them */	1224	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1225	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1226	#if EV_PERIODICS
475	/* relative timers second */	1227	periodics_reify (EV_A); /* absolute timers called first */
476	timers_reify (rtimers, rtimercnt, now);	1228	#endif
477		1229
		1230	/* queue idle watchers unless io or timers are pending */
		1231	if (idlecnt && !any_pending (EV_A))
		1232	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1233
		1234	/* queue check watchers, to be executed first */
		1235	if (checkcnt)
		1236	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1237
478	call_pending ();	1238	call_pending (EV_A);
479	}
480	while (!ev_loop_done);
481	}
482		1239
483	static void	1240	if (loop_done)
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1241	break;
		1242	}
		1243
		1244	if (loop_done != 2)
		1245	loop_done = 0;
		1246	}
		1247
		1248	void
		1249	ev_unloop (EV_P_ int how)
		1250	{
		1251	loop_done = how;
		1252	}
		1253
		1254	/*****************************************************************************/
		1255
		1256	inline void
		1257	wlist_add (WL *head, WL elem)
485	{	1258	{
486	elem->next = *head;	1259	elem->next = *head;
487	*head = elem;	1260	*head = elem;
488	}	1261	}
489		1262
490	static void	1263	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1264	wlist_del (WL *head, WL elem)
492	{	1265	{
493	while (*head)	1266	while (*head)
494	{	1267	{
495	if (*head == elem)	1268	if (*head == elem)
496	{	1269	{
…		…
500		1273
501	head = &(*head)->next;	1274	head = &(*head)->next;
502	}	1275	}
503	}	1276	}
504		1277
505	static void	1278	inline void
506	ev_start (struct ev_watcher *w, int active)	1279	ev_clear_pending (EV_P_ W w)
507	{	1280	{
		1281	if (w->pending)
		1282	{
		1283	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1284	w->pending = 0;
		1285	}
		1286	}
		1287
		1288	inline void
		1289	ev_start (EV_P_ W w, int active)
		1290	{
		1291	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1292	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1293
509	w->active = active;	1294	w->active = active;
		1295	ev_ref (EV_A);
510	}	1296	}
511		1297
512	static void	1298	inline void
513	ev_stop (struct ev_watcher *w)	1299	ev_stop (EV_P_ W w)
514	{	1300	{
515	if (w->pending)	1301	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1302	w->active = 0;
519	/* nop */
520	}	1303	}
521		1304
		1305	/*****************************************************************************/
		1306
522	void	1307	void
523	evio_start (struct ev_io *w)	1308	ev_io_start (EV_P_ struct ev_io *w)
524	{	1309	{
		1310	int fd = w->fd;
		1311
525	if (ev_is_active (w))	1312	if (ev_is_active (w))
526	return;	1313	return;
527		1314
528	int fd = w->fd;	1315	assert (("ev_io_start called with negative fd", fd >= 0));
529		1316
530	ev_start ((struct ev_watcher *)w, 1);	1317	ev_start (EV_A_ (W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1318	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1319	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		1320
534	++fdchangecnt;	1321	fd_change (EV_A_ fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	1322	}
538		1323
539	void	1324	void
540	evio_stop (struct ev_io *w)	1325	ev_io_stop (EV_P_ struct ev_io *w)
541	{	1326	{
		1327	ev_clear_pending (EV_A_ (W)w);
542	if (!ev_is_active (w))	1328	if (!ev_is_active (w))
543	return;	1329	return;
544		1330
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1331	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
546	ev_stop ((struct ev_watcher *)w);
547		1332
548	++fdchangecnt;	1333	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1334	ev_stop (EV_A_ (W)w);
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}
552		1335
		1336	fd_change (EV_A_ w->fd);
		1337	}
		1338
553	void	1339	void
554	evtimer_start (struct ev_timer *w)	1340	ev_timer_start (EV_P_ struct ev_timer *w)
555	{	1341	{
556	if (ev_is_active (w))	1342	if (ev_is_active (w))
557	return;	1343	return;
558		1344
559	if (w->is_abs)	1345	((WT)w)->at += mn_now;
		1346
		1347	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1348
		1349	ev_start (EV_A_ (W)w, ++timercnt);
		1350	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1351	timers [timercnt - 1] = w;
		1352	upheap ((WT *)timers, timercnt - 1);
		1353
		1354	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1355	}
		1356
		1357	void
		1358	ev_timer_stop (EV_P_ struct ev_timer *w)
		1359	{
		1360	ev_clear_pending (EV_A_ (W)w);
		1361	if (!ev_is_active (w))
		1362	return;
		1363
		1364	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1365
		1366	if (((W)w)->active < timercnt--)
		1367	{
		1368	timers [((W)w)->active - 1] = timers [timercnt];
		1369	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
560	{	1370	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	1371
		1372	((WT)w)->at -= mn_now;
		1373
		1374	ev_stop (EV_A_ (W)w);
		1375	}
		1376
		1377	void
		1378	ev_timer_again (EV_P_ struct ev_timer *w)
		1379	{
		1380	if (ev_is_active (w))
		1381	{
562	if (w->repeat)	1382	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1383	{
564		1384	((WT)w)->at = mn_now + w->repeat;
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1385	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
566	array_needsize (atimers, atimermax, atimercnt, );	1386	}
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else	1387	else
		1388	ev_timer_stop (EV_A_ w);
571	{	1389	}
572	w->at += now;	1390	else if (w->repeat)
573
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );
576	rtimers [rtimercnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);
578	}	1391	{
579		1392	w->at = w->repeat;
		1393	ev_timer_start (EV_A_ w);
		1394	}
580	}	1395	}
581		1396
		1397	#if EV_PERIODICS
582	void	1398	void
583	evtimer_stop (struct ev_timer *w)	1399	ev_periodic_start (EV_P_ struct ev_periodic *w)
584	{	1400	{
		1401	if (ev_is_active (w))
		1402	return;
		1403
		1404	if (w->reschedule_cb)
		1405	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1406	else if (w->interval)
		1407	{
		1408	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1409	/* this formula differs from the one in periodic_reify because we do not always round up */
		1410	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1411	}
		1412
		1413	ev_start (EV_A_ (W)w, ++periodiccnt);
		1414	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1415	periodics [periodiccnt - 1] = w;
		1416	upheap ((WT *)periodics, periodiccnt - 1);
		1417
		1418	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1419	}
		1420
		1421	void
		1422	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1423	{
		1424	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1425	if (!ev_is_active (w))
586	return;	1426	return;
587		1427
588	if (w->is_abs)	1428	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
589	{	1429
590	if (w->active < atimercnt--)	1430	if (((W)w)->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	1431	{
596	else	1432	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1433	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
597	{	1434	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1435
605	ev_stop ((struct ev_watcher *)w);	1436	ev_stop (EV_A_ (W)w);
606	}	1437	}
607		1438
608	void	1439	void
609	evsignal_start (struct ev_signal *w)	1440	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1441	{
		1442	/* TODO: use adjustheap and recalculation */
		1443	ev_periodic_stop (EV_A_ w);
		1444	ev_periodic_start (EV_A_ w);
		1445	}
		1446	#endif
		1447
		1448	void
		1449	ev_idle_start (EV_P_ struct ev_idle *w)
610	{	1450	{
611	if (ev_is_active (w))	1451	if (ev_is_active (w))
612	return;	1452	return;
613		1453
614	ev_start ((struct ev_watcher *)w, 1);	1454	ev_start (EV_A_ (W)w, ++idlecnt);
		1455	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1456	idles [idlecnt - 1] = w;
		1457	}
		1458
		1459	void
		1460	ev_idle_stop (EV_P_ struct ev_idle *w)
		1461	{
		1462	ev_clear_pending (EV_A_ (W)w);
		1463	if (!ev_is_active (w))
		1464	return;
		1465
		1466	idles [((W)w)->active - 1] = idles [--idlecnt];
		1467	ev_stop (EV_A_ (W)w);
		1468	}
		1469
		1470	void
		1471	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1472	{
		1473	if (ev_is_active (w))
		1474	return;
		1475
		1476	ev_start (EV_A_ (W)w, ++preparecnt);
		1477	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1478	prepares [preparecnt - 1] = w;
		1479	}
		1480
		1481	void
		1482	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1483	{
		1484	ev_clear_pending (EV_A_ (W)w);
		1485	if (!ev_is_active (w))
		1486	return;
		1487
		1488	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1489	ev_stop (EV_A_ (W)w);
		1490	}
		1491
		1492	void
		1493	ev_check_start (EV_P_ struct ev_check *w)
		1494	{
		1495	if (ev_is_active (w))
		1496	return;
		1497
		1498	ev_start (EV_A_ (W)w, ++checkcnt);
		1499	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1500	checks [checkcnt - 1] = w;
		1501	}
		1502
		1503	void
		1504	ev_check_stop (EV_P_ struct ev_check *w)
		1505	{
		1506	ev_clear_pending (EV_A_ (W)w);
		1507	if (!ev_is_active (w))
		1508	return;
		1509
		1510	checks [((W)w)->active - 1] = checks [--checkcnt];
		1511	ev_stop (EV_A_ (W)w);
		1512	}
		1513
		1514	#ifndef SA_RESTART
		1515	# define SA_RESTART 0
		1516	#endif
		1517
		1518	void
		1519	ev_signal_start (EV_P_ struct ev_signal *w)
		1520	{
		1521	#if EV_MULTIPLICITY
		1522	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1523	#endif
		1524	if (ev_is_active (w))
		1525	return;
		1526
		1527	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1528
		1529	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1530	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1531	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1532
618	if (!w->next)	1533	if (!((WL)w)->next)
619	{	1534	{
		1535	#if _WIN32
		1536	signal (w->signum, sighandler);
		1537	#else
620	struct sigaction sa;	1538	struct sigaction sa;
621	sa.sa_handler = sighandler;	1539	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1540	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1541	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1542	sigaction (w->signum, &sa, 0);
		1543	#endif
625	}	1544	}
626	}	1545	}
627		1546
628	void	1547	void
629	evsignal_stop (struct ev_signal *w)	1548	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1549	{
		1550	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1551	if (!ev_is_active (w))
632	return;	1552	return;
633		1553
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1554	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1555	ev_stop (EV_A_ (W)w);
636		1556
637	if (!signals [w->signum - 1].head)	1557	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1558	signal (w->signum, SIG_DFL);
639	}	1559	}
640		1560
		1561	void
		1562	ev_child_start (EV_P_ struct ev_child *w)
		1563	{
		1564	#if EV_MULTIPLICITY
		1565	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1566	#endif
		1567	if (ev_is_active (w))
		1568	return;
		1569
		1570	ev_start (EV_A_ (W)w, 1);
		1571	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1572	}
		1573
		1574	void
		1575	ev_child_stop (EV_P_ struct ev_child *w)
		1576	{
		1577	ev_clear_pending (EV_A_ (W)w);
		1578	if (!ev_is_active (w))
		1579	return;
		1580
		1581	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1582	ev_stop (EV_A_ (W)w);
		1583	}
		1584
641	/*****************************************************************************/	1585	/*****************************************************************************/
642	#if 1
643		1586
644	static void	1587	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1588	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648	}
649
650	static void
651	ocb (struct ev_timer *w, int revents)
652	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}
657
658	static void
659	scb (struct ev_signal *w, int revents)
660	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662	}
663
664	int main (void)
665	{
666	struct ev_io sin;	1589	struct ev_io io;
667
668	ev_init (0);
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}
687	#endif
688
689	struct ev_timer t1;	1590	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1591	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1592	void *arg;
692	evtimer_start (&t1);	1593	};
693		1594
694	struct ev_signal sig;	1595	static void
695	evw_init (&sig, scb, 65535);	1596	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1597	{
697	evsignal_start (&sig);	1598	void (*cb)(int revents, void *arg) = once->cb;
		1599	void *arg = once->arg;
698		1600
699	ev_loop (0);	1601	ev_io_stop (EV_A_ &once->io);
		1602	ev_timer_stop (EV_A_ &once->to);
		1603	ev_free (once);
700		1604
701	return 0;	1605	cb (revents, arg);
702	}	1606	}
703		1607
704	#endif	1608	static void
		1609	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1610	{
		1611	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1612	}
705		1613
		1614	static void
		1615	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1616	{
		1617	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1618	}
706		1619
		1620	void
		1621	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1622	{
		1623	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
707		1624
		1625	if (!once)
		1626	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1627	else
		1628	{
		1629	once->cb = cb;
		1630	once->arg = arg;
708		1631
		1632	ev_init (&once->io, once_cb_io);
		1633	if (fd >= 0)
		1634	{
		1635	ev_io_set (&once->io, fd, events);
		1636	ev_io_start (EV_A_ &once->io);
		1637	}
		1638
		1639	ev_init (&once->to, once_cb_to);
		1640	if (timeout >= 0.)
		1641	{
		1642	ev_timer_set (&once->to, timeout, 0.);
		1643	ev_timer_start (EV_A_ &once->to);
		1644	}
		1645	}
		1646	}
		1647
		1648	#ifdef __cplusplus
		1649	}
		1650	#endif
		1651

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