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

Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.103 by root, Mon Nov 12 00:31:08 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
14	#ifndef HAVE_MONOTONIC	78	#include <signal.h>
15	# ifdef CLOCK_MONOTONIC	79
16	# define HAVE_MONOTONIC 1	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
17	# endif	89	# endif
18	#endif	90	#endif
19		91
		92	/**/
		93
		94	#ifndef EV_USE_MONOTONIC
		95	# define EV_USE_MONOTONIC 1
		96	#endif
		97
20	#ifndef HAVE_SELECT	98	#ifndef EV_USE_SELECT
21	# define HAVE_SELECT 1	99	# define EV_USE_SELECT 1
22	#endif	100	#endif
23		101
		102	#ifndef EV_USE_POLL
		103	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		104	#endif
		105
24	#ifndef HAVE_EPOLL	106	#ifndef EV_USE_EPOLL
25	# define HAVE_EPOLL 0	107	# define EV_USE_EPOLL 0
26	#endif	108	#endif
27		109
		110	#ifndef EV_USE_KQUEUE
		111	# define EV_USE_KQUEUE 0
		112	#endif
		113
28	#ifndef HAVE_REALTIME	114	#ifndef EV_USE_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	115	# define EV_USE_REALTIME 1
30	#endif	116	#endif
		117
		118	/**/
		119
		120	#ifndef CLOCK_MONOTONIC
		121	# undef EV_USE_MONOTONIC
		122	# define EV_USE_MONOTONIC 0
		123	#endif
		124
		125	#ifndef CLOCK_REALTIME
		126	# undef EV_USE_REALTIME
		127	# define EV_USE_REALTIME 0
		128	#endif
		129
		130	#if EV_SELECT_IS_WINSOCKET
		131	# include <winsock.h>
		132	#endif
		133
		134	/**/
31		135
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	136	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	137	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		138	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		139	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
34		140
		141	#ifdef EV_H
		142	# include EV_H
		143	#else
35	#include "ev.h"	144	# include "ev.h"
		145	#endif
36		146
37	struct ev_watcher {	147	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	148	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	149	# define inline inline
		150	#else
		151	# define expect(expr,value) (expr)
		152	# define inline static
		153	#endif
40		154
41	struct ev_watcher_list {	155	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	156	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	157
		158	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		159	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		160
		161	#define EMPTY /* required for microsofts broken pseudo-c compiler */
44		162
45	typedef struct ev_watcher *W;	163	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	164	typedef struct ev_watcher_list *WL;
		165	typedef struct ev_watcher_time *WT;
47		166
48	static ev_tstamp now, diff; /* monotonic clock */	167	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		168
		169	#ifdef _WIN32
		170	# include "ev_win32.c"
		171	#endif
		172
		173	/*****************************************************************************/
		174
		175	static void (syserr_cb)(const char msg);
		176
		177	void ev_set_syserr_cb (void (cb)(const char msg))
		178	{
		179	syserr_cb = cb;
		180	}
		181
		182	static void
		183	syserr (const char *msg)
		184	{
		185	if (!msg)
		186	msg = "(libev) system error";
		187
		188	if (syserr_cb)
		189	syserr_cb (msg);
		190	else
		191	{
		192	perror (msg);
		193	abort ();
		194	}
		195	}
		196
		197	static void (alloc)(void *ptr, long size);
		198
		199	void ev_set_allocator (void (cb)(void *ptr, long size))
		200	{
		201	alloc = cb;
		202	}
		203
		204	static void *
		205	ev_realloc (void *ptr, long size)
		206	{
		207	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		208
		209	if (!ptr && size)
		210	{
		211	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		212	abort ();
		213	}
		214
		215	return ptr;
		216	}
		217
		218	#define ev_malloc(size) ev_realloc (0, (size))
		219	#define ev_free(ptr) ev_realloc ((ptr), 0)
		220
		221	/*****************************************************************************/
		222
		223	typedef struct
		224	{
		225	WL head;
		226	unsigned char events;
		227	unsigned char reify;
		228	#if EV_SELECT_IS_WINSOCKET
		229	SOCKET handle;
		230	#endif
		231	} ANFD;
		232
		233	typedef struct
		234	{
		235	W w;
		236	int events;
		237	} ANPENDING;
		238
		239	#if EV_MULTIPLICITY
		240
		241	struct ev_loop
		242	{
		243	ev_tstamp ev_rt_now;
		244	#define ev_rt_now ((loop)->ev_rt_now)
		245	#define VAR(name,decl) decl;
		246	#include "ev_vars.h"
		247	#undef VAR
		248	};
		249	#include "ev_wrap.h"
		250
		251	struct ev_loop default_loop_struct;
		252	static struct ev_loop *default_loop;
		253
		254	#else
		255
49	ev_tstamp ev_now;	256	ev_tstamp ev_rt_now;
50	int ev_method;	257	#define VAR(name,decl) static decl;
		258	#include "ev_vars.h"
		259	#undef VAR
51		260
52	static int have_monotonic; /* runtime */	261	static int default_loop;
53		262
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	263	#endif
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		264
58	/*****************************************************************************/	265	/*****************************************************************************/
59		266
60	ev_tstamp	267	ev_tstamp
61	ev_time (void)	268	ev_time (void)
62	{	269	{
63	#if HAVE_REALTIME	270	#if EV_USE_REALTIME
64	struct timespec ts;	271	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	272	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	273	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	274	#else
68	struct timeval tv;	275	struct timeval tv;
69	gettimeofday (&tv, 0);	276	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	277	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	278	#endif
72	}	279	}
73		280
74	static ev_tstamp	281	inline ev_tstamp
75	get_clock (void)	282	get_clock (void)
76	{	283	{
77	#if HAVE_MONOTONIC	284	#if EV_USE_MONOTONIC
78	if (have_monotonic)	285	if (expect_true (have_monotonic))
79	{	286	{
80	struct timespec ts;	287	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	288	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	289	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	290	}
84	#endif	291	#endif
85		292
86	return ev_time ();	293	return ev_time ();
87	}	294	}
88		295
		296	#if EV_MULTIPLICITY
		297	ev_tstamp
		298	ev_now (EV_P)
		299	{
		300	return ev_rt_now;
		301	}
		302	#endif
		303
		304	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		305
89	#define array_needsize(base,cur,cnt,init) \	306	#define array_needsize(type,base,cur,cnt,init) \
90	if ((cnt) > cur) \	307	if (expect_false ((cnt) > cur)) \
91	{ \	308	{ \
92	int newcnt = cur ? cur << 1 : 16; \	309	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	310	do \
		311	{ \
		312	newcnt = array_roundsize (type, newcnt << 1); \
		313	} \
		314	while ((cnt) > newcnt); \
		315	\
94	base = realloc (base, sizeof (base) (newcnt)); \	316	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
95	init (base + cur, newcnt - cur); \	317	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	318	cur = newcnt; \
97	}	319	}
		320
		321	#define array_slim(type,stem) \
		322	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		323	{ \
		324	stem ## max = array_roundsize (stem ## cnt >> 1); \
		325	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		326	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		327	}
		328
		329	#define array_free(stem, idx) \
		330	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		331
99	/*****************************************************************************/	332	/*****************************************************************************/
100		333
101	typedef struct
102	{
103	struct ev_io *head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	334	static void
114	anfds_init (ANFD *base, int count)	335	anfds_init (ANFD *base, int count)
115	{	336	{
116	while (count--)	337	while (count--)
117	{	338	{
118	base->head = 0;	339	base->head = 0;
119	base->wev = base->rev = EV_NONE;	340	base->events = EV_NONE;
		341	base->reify = 0;
		342
120	++base;	343	++base;
121	}	344	}
122	}	345	}
123		346
124	typedef struct	347	void
		348	ev_feed_event (EV_P_ void *w, int revents)
125	{	349	{
126	W w;	350	W w_ = (W)w;
127	int events;
128	} ANPENDING;
129		351
130	static ANPENDING *pendings;	352	if (w_->pending)
131	static int pendingmax, pendingcnt;	353	{
		354	pendings [ABSPRI (w_)][w_->pending - 1].events \|= revents;
		355	return;
		356	}
132		357
133	static void
134	event (W w, int events)
135	{
136	w->pending = ++pendingcnt;	358	w_->pending = ++pendingcnt [ABSPRI (w_)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	359	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
138	pendings [pendingcnt - 1].w = w;	360	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
139	pendings [pendingcnt - 1].events = events;	361	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
140	}	362	}
141		363
142	static void	364	static void
		365	queue_events (EV_P_ W *events, int eventcnt, int type)
		366	{
		367	int i;
		368
		369	for (i = 0; i < eventcnt; ++i)
		370	ev_feed_event (EV_A_ events [i], type);
		371	}
		372
		373	inline void
143	fd_event (int fd, int events)	374	fd_event (EV_P_ int fd, int revents)
144	{	375	{
145	ANFD *anfd = anfds + fd;	376	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	377	struct ev_io *w;
147		378
148	for (w = anfd->head; w; w = w->next)	379	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
149	{	380	{
150	int ev = w->events & events;	381	int ev = w->events & revents;
151		382
152	if (ev)	383	if (ev)
153	event ((W)w, ev);	384	ev_feed_event (EV_A_ (W)w, ev);
154	}	385	}
155	}	386	}
156		387
157	static void	388	void
158	queue_events (W *events, int eventcnt, int type)	389	ev_feed_fd_event (EV_P_ int fd, int revents)
159	{	390	{
160	int i;	391	fd_event (EV_A_ fd, revents);
161
162	for (i = 0; i < eventcnt; ++i)
163	event (events [i], type);
164	}	392	}
165		393
166	/*****************************************************************************/	394	/*****************************************************************************/
167		395
168	static struct ev_timer **atimers;
169	static int atimermax, atimercnt;
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void	396	static void
175	upheap (struct ev_timer **timers, int k)	397	fd_reify (EV_P)
176	{
177	struct ev_timer *w = timers [k];
178
179	while (k && timers [k >> 1]->at > w->at)
180	{
181	timers [k] = timers [k >> 1];
182	timers [k]->active = k + 1;
183	k >>= 1;
184	}
185
186	timers [k] = w;
187	timers [k]->active = k + 1;
188
189	}
190
191	static void
192	downheap (struct ev_timer **timers, int N, int k)
193	{
194	struct ev_timer *w = timers [k];
195
196	while (k < (N >> 1))
197	{
198	int j = k << 1;
199
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
201	++j;
202
203	if (w->at <= timers [j]->at)
204	break;
205
206	timers [k] = timers [j];
207	timers [k]->active = k + 1;
208	k = j;
209	}
210
211	timers [k] = w;
212	timers [k]->active = k + 1;
213	}
214
215	/*****************************************************************************/
216
217	typedef struct
218	{
219	struct ev_signal *head;
220	sig_atomic_t gotsig;
221	} ANSIG;
222
223	static ANSIG *signals;
224	static int signalmax;
225
226	static int sigpipe [2];
227	static sig_atomic_t gotsig;
228	static struct ev_io sigev;
229
230	static void
231	signals_init (ANSIG *base, int count)
232	{
233	while (count--)
234	{
235	base->head = 0;
236	base->gotsig = 0;
237	++base;
238	}
239	}
240
241	static void
242	sighandler (int signum)
243	{
244	signals [signum - 1].gotsig = 1;
245
246	if (!gotsig)
247	{
248	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);
250	}
251	}
252
253	static void
254	sigcb (struct ev_io *iow, int revents)
255	{
256	struct ev_signal *w;
257	int sig;
258
259	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261
262	for (sig = signalmax; sig--; )
263	if (signals [sig].gotsig)
264	{
265	signals [sig].gotsig = 0;
266
267	for (w = signals [sig].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);
269	}
270	}
271
272	static void
273	siginit (void)
274	{
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277
278	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
281
282	evio_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);
284	}
285
286	/*****************************************************************************/
287
288	static struct ev_idle **idles;
289	static int idlemax, idlecnt;
290
291	static struct ev_check **checks;
292	static int checkmax, checkcnt;
293
294	/*****************************************************************************/
295
296	#if HAVE_EPOLL
297	# include "ev_epoll.c"
298	#endif
299	#if HAVE_SELECT
300	# include "ev_select.c"
301	#endif
302
303	int ev_init (int flags)
304	{
305	#if HAVE_MONOTONIC
306	{
307	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;
310	}
311	#endif
312
313	ev_now = ev_time ();
314	now = get_clock ();
315	diff = ev_now - now;
316
317	if (pipe (sigpipe))
318	return 0;
319
320	ev_method = EVMETHOD_NONE;
321	#if HAVE_EPOLL
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327
328	if (ev_method)
329	{
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}
336
337	/*****************************************************************************/
338
339	void ev_prefork (void)
340	{
341	}
342
343	void ev_postfork_parent (void)
344	{
345	}
346
347	void ev_postfork_child (void)
348	{
349	#if HAVE_EPOLL
350	if (ev_method == EVMETHOD_EPOLL)
351	epoll_postfork_child ();
352	#endif
353
354	evio_stop (&sigev);
355	close (sigpipe [0]);
356	close (sigpipe [1]);
357	pipe (sigpipe);
358	siginit ();
359	}
360
361	/*****************************************************************************/
362
363	static void
364	fd_reify (void)
365	{	398	{
366	int i;	399	int i;
367		400
368	for (i = 0; i < fdchangecnt; ++i)	401	for (i = 0; i < fdchangecnt; ++i)
369	{	402	{
370	int fd = fdchanges [i];	403	int fd = fdchanges [i];
371	ANFD *anfd = anfds + fd;	404	ANFD *anfd = anfds + fd;
372	struct ev_io *w;	405	struct ev_io *w;
373		406
374	int wev = 0;	407	int events = 0;
375		408
376	for (w = anfd->head; w; w = w->next)	409	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
377	wev \|= w->events;	410	events \|= w->events;
378		411
379	if (anfd->wev != wev)	412	#if EV_SELECT_IS_WINSOCKET
		413	if (events)
380	{	414	{
381	method_modify (fd, anfd->wev, wev);	415	unsigned long argp;
382	anfd->wev = wev;	416	anfd->handle = _get_osfhandle (fd);
		417	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
383	}	418	}
		419	#endif
		420
		421	anfd->reify = 0;
		422
		423	method_modify (EV_A_ fd, anfd->events, events);
		424	anfd->events = events;
384	}	425	}
385		426
386	fdchangecnt = 0;	427	fdchangecnt = 0;
387	}	428	}
388		429
389	static void	430	static void
390	call_pending ()	431	fd_change (EV_P_ int fd)
		432	{
		433	if (anfds [fd].reify)
		434	return;
		435
		436	anfds [fd].reify = 1;
		437
		438	++fdchangecnt;
		439	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		440	fdchanges [fdchangecnt - 1] = fd;
		441	}
		442
		443	static void
		444	fd_kill (EV_P_ int fd)
		445	{
		446	struct ev_io *w;
		447
		448	while ((w = (struct ev_io *)anfds [fd].head))
		449	{
		450	ev_io_stop (EV_A_ w);
		451	ev_feed_event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		452	}
		453	}
		454
		455	static int
		456	fd_valid (int fd)
		457	{
		458	#ifdef _WIN32
		459	return _get_osfhandle (fd) != -1;
		460	#else
		461	return fcntl (fd, F_GETFD) != -1;
		462	#endif
		463	}
		464
		465	/* called on EBADF to verify fds */
		466	static void
		467	fd_ebadf (EV_P)
		468	{
		469	int fd;
		470
		471	for (fd = 0; fd < anfdmax; ++fd)
		472	if (anfds [fd].events)
		473	if (!fd_valid (fd) == -1 && errno == EBADF)
		474	fd_kill (EV_A_ fd);
		475	}
		476
		477	/* called on ENOMEM in select/poll to kill some fds and retry */
		478	static void
		479	fd_enomem (EV_P)
		480	{
		481	int fd;
		482
		483	for (fd = anfdmax; fd--; )
		484	if (anfds [fd].events)
		485	{
		486	fd_kill (EV_A_ fd);
		487	return;
		488	}
		489	}
		490
		491	/* usually called after fork if method needs to re-arm all fds from scratch */
		492	static void
		493	fd_rearm_all (EV_P)
		494	{
		495	int fd;
		496
		497	/* this should be highly optimised to not do anything but set a flag */
		498	for (fd = 0; fd < anfdmax; ++fd)
		499	if (anfds [fd].events)
		500	{
		501	anfds [fd].events = 0;
		502	fd_change (EV_A_ fd);
		503	}
		504	}
		505
		506	/*****************************************************************************/
		507
		508	static void
		509	upheap (WT *heap, int k)
		510	{
		511	WT w = heap [k];
		512
		513	while (k && heap [k >> 1]->at > w->at)
		514	{
		515	heap [k] = heap [k >> 1];
		516	((W)heap [k])->active = k + 1;
		517	k >>= 1;
		518	}
		519
		520	heap [k] = w;
		521	((W)heap [k])->active = k + 1;
		522
		523	}
		524
		525	static void
		526	downheap (WT *heap, int N, int k)
		527	{
		528	WT w = heap [k];
		529
		530	while (k < (N >> 1))
		531	{
		532	int j = k << 1;
		533
		534	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		535	++j;
		536
		537	if (w->at <= heap [j]->at)
		538	break;
		539
		540	heap [k] = heap [j];
		541	((W)heap [k])->active = k + 1;
		542	k = j;
		543	}
		544
		545	heap [k] = w;
		546	((W)heap [k])->active = k + 1;
		547	}
		548
		549	inline void
		550	adjustheap (WT *heap, int N, int k)
		551	{
		552	upheap (heap, k);
		553	downheap (heap, N, k);
		554	}
		555
		556	/*****************************************************************************/
		557
		558	typedef struct
		559	{
		560	WL head;
		561	sig_atomic_t volatile gotsig;
		562	} ANSIG;
		563
		564	static ANSIG *signals;
		565	static int signalmax;
		566
		567	static int sigpipe [2];
		568	static sig_atomic_t volatile gotsig;
		569	static struct ev_io sigev;
		570
		571	static void
		572	signals_init (ANSIG *base, int count)
		573	{
		574	while (count--)
		575	{
		576	base->head = 0;
		577	base->gotsig = 0;
		578
		579	++base;
		580	}
		581	}
		582
		583	static void
		584	sighandler (int signum)
		585	{
		586	#if _WIN32
		587	signal (signum, sighandler);
		588	#endif
		589
		590	signals [signum - 1].gotsig = 1;
		591
		592	if (!gotsig)
		593	{
		594	int old_errno = errno;
		595	gotsig = 1;
		596	write (sigpipe [1], &signum, 1);
		597	errno = old_errno;
		598	}
		599	}
		600
		601	void
		602	ev_feed_signal_event (EV_P_ int signum)
		603	{
		604	WL w;
		605
		606	#if EV_MULTIPLICITY
		607	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		608	#endif
		609
		610	--signum;
		611
		612	if (signum < 0 \|\| signum >= signalmax)
		613	return;
		614
		615	signals [signum].gotsig = 0;
		616
		617	for (w = signals [signum].head; w; w = w->next)
		618	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		619	}
		620
		621	static void
		622	sigcb (EV_P_ struct ev_io *iow, int revents)
		623	{
		624	int signum;
		625
		626	read (sigpipe [0], &revents, 1);
		627	gotsig = 0;
		628
		629	for (signum = signalmax; signum--; )
		630	if (signals [signum].gotsig)
		631	ev_feed_signal_event (EV_A_ signum + 1);
		632	}
		633
		634	inline void
		635	fd_intern (int fd)
		636	{
		637	#ifdef _WIN32
		638	int arg = 1;
		639	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		640	#else
		641	fcntl (fd, F_SETFD, FD_CLOEXEC);
		642	fcntl (fd, F_SETFL, O_NONBLOCK);
		643	#endif
		644	}
		645
		646	static void
		647	siginit (EV_P)
		648	{
		649	fd_intern (sigpipe [0]);
		650	fd_intern (sigpipe [1]);
		651
		652	ev_io_set (&sigev, sigpipe [0], EV_READ);
		653	ev_io_start (EV_A_ &sigev);
		654	ev_unref (EV_A); /* child watcher should not keep loop alive */
		655	}
		656
		657	/*****************************************************************************/
		658
		659	static struct ev_child *childs [PID_HASHSIZE];
		660
		661	#ifndef _WIN32
		662
		663	static struct ev_signal childev;
		664
		665	#ifndef WCONTINUED
		666	# define WCONTINUED 0
		667	#endif
		668
		669	static void
		670	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		671	{
		672	struct ev_child *w;
		673
		674	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		675	if (w->pid == pid \|\| !w->pid)
		676	{
		677	ev_priority (w) = ev_priority (sw); /* need to do it now */
		678	w->rpid = pid;
		679	w->rstatus = status;
		680	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		681	}
		682	}
		683
		684	static void
		685	childcb (EV_P_ struct ev_signal *sw, int revents)
		686	{
		687	int pid, status;
		688
		689	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		690	{
		691	/* make sure we are called again until all childs have been reaped */
		692	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		693
		694	child_reap (EV_A_ sw, pid, pid, status);
		695	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		696	}
		697	}
		698
		699	#endif
		700
		701	/*****************************************************************************/
		702
		703	#if EV_USE_KQUEUE
		704	# include "ev_kqueue.c"
		705	#endif
		706	#if EV_USE_EPOLL
		707	# include "ev_epoll.c"
		708	#endif
		709	#if EV_USE_POLL
		710	# include "ev_poll.c"
		711	#endif
		712	#if EV_USE_SELECT
		713	# include "ev_select.c"
		714	#endif
		715
		716	int
		717	ev_version_major (void)
		718	{
		719	return EV_VERSION_MAJOR;
		720	}
		721
		722	int
		723	ev_version_minor (void)
		724	{
		725	return EV_VERSION_MINOR;
		726	}
		727
		728	/* return true if we are running with elevated privileges and should ignore env variables */
		729	static int
		730	enable_secure (void)
		731	{
		732	#ifdef _WIN32
		733	return 0;
		734	#else
		735	return getuid () != geteuid ()
		736	\|\| getgid () != getegid ();
		737	#endif
		738	}
		739
		740	int
		741	ev_method (EV_P)
		742	{
		743	return method;
		744	}
		745
		746	static void
		747	loop_init (EV_P_ int methods)
		748	{
		749	if (!method)
		750	{
		751	#if EV_USE_MONOTONIC
		752	{
		753	struct timespec ts;
		754	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		755	have_monotonic = 1;
		756	}
		757	#endif
		758
		759	ev_rt_now = ev_time ();
		760	mn_now = get_clock ();
		761	now_floor = mn_now;
		762	rtmn_diff = ev_rt_now - mn_now;
		763
		764	if (methods == EVMETHOD_AUTO)
		765	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		766	methods = atoi (getenv ("LIBEV_METHODS"));
		767	else
		768	methods = EVMETHOD_ANY;
		769
		770	method = 0;
		771	#if EV_USE_KQUEUE
		772	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		773	#endif
		774	#if EV_USE_EPOLL
		775	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		776	#endif
		777	#if EV_USE_POLL
		778	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		779	#endif
		780	#if EV_USE_SELECT
		781	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		782	#endif
		783
		784	ev_init (&sigev, sigcb);
		785	ev_set_priority (&sigev, EV_MAXPRI);
		786	}
		787	}
		788
		789	void
		790	loop_destroy (EV_P)
391	{	791	{
392	int i;	792	int i;
393		793
394	for (i = 0; i < pendingcnt; ++i)	794	#if EV_USE_KQUEUE
		795	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		796	#endif
		797	#if EV_USE_EPOLL
		798	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		799	#endif
		800	#if EV_USE_POLL
		801	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		802	#endif
		803	#if EV_USE_SELECT
		804	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		805	#endif
		806
		807	for (i = NUMPRI; i--; )
		808	array_free (pending, [i]);
		809
		810	/* have to use the microsoft-never-gets-it-right macro */
		811	array_free (fdchange, EMPTY);
		812	array_free (timer, EMPTY);
		813	#if EV_PERIODICS
		814	array_free (periodic, EMPTY);
		815	#endif
		816	array_free (idle, EMPTY);
		817	array_free (prepare, EMPTY);
		818	array_free (check, EMPTY);
		819
		820	method = 0;
		821	}
		822
		823	static void
		824	loop_fork (EV_P)
		825	{
		826	#if EV_USE_EPOLL
		827	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		828	#endif
		829	#if EV_USE_KQUEUE
		830	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		831	#endif
		832
		833	if (ev_is_active (&sigev))
		834	{
		835	/* default loop */
		836
		837	ev_ref (EV_A);
		838	ev_io_stop (EV_A_ &sigev);
		839	close (sigpipe [0]);
		840	close (sigpipe [1]);
		841
		842	while (pipe (sigpipe))
		843	syserr ("(libev) error creating pipe");
		844
		845	siginit (EV_A);
395	{	846	}
396	ANPENDING *p = pendings + i;
397		847
398	if (p->w)	848	postfork = 0;
		849	}
		850
		851	#if EV_MULTIPLICITY
		852	struct ev_loop *
		853	ev_loop_new (int methods)
		854	{
		855	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		856
		857	memset (loop, 0, sizeof (struct ev_loop));
		858
		859	loop_init (EV_A_ methods);
		860
		861	if (ev_method (EV_A))
		862	return loop;
		863
		864	return 0;
		865	}
		866
		867	void
		868	ev_loop_destroy (EV_P)
		869	{
		870	loop_destroy (EV_A);
		871	ev_free (loop);
		872	}
		873
		874	void
		875	ev_loop_fork (EV_P)
		876	{
		877	postfork = 1;
		878	}
		879
		880	#endif
		881
		882	#if EV_MULTIPLICITY
		883	struct ev_loop *
		884	#else
		885	int
		886	#endif
		887	ev_default_loop (int methods)
		888	{
		889	if (sigpipe [0] == sigpipe [1])
		890	if (pipe (sigpipe))
		891	return 0;
		892
		893	if (!default_loop)
		894	{
		895	#if EV_MULTIPLICITY
		896	struct ev_loop *loop = default_loop = &default_loop_struct;
		897	#else
		898	default_loop = 1;
		899	#endif
		900
		901	loop_init (EV_A_ methods);
		902
		903	if (ev_method (EV_A))
399	{	904	{
400	p->w->pending = 0;	905	siginit (EV_A);
401	p->w->cb (p->w, p->events);	906
		907	#ifndef _WIN32
		908	ev_signal_init (&childev, childcb, SIGCHLD);
		909	ev_set_priority (&childev, EV_MAXPRI);
		910	ev_signal_start (EV_A_ &childev);
		911	ev_unref (EV_A); /* child watcher should not keep loop alive */
		912	#endif
402	}	913	}
		914	else
		915	default_loop = 0;
		916	}
		917
		918	return default_loop;
		919	}
		920
		921	void
		922	ev_default_destroy (void)
		923	{
		924	#if EV_MULTIPLICITY
		925	struct ev_loop *loop = default_loop;
		926	#endif
		927
		928	#ifndef _WIN32
		929	ev_ref (EV_A); /* child watcher */
		930	ev_signal_stop (EV_A_ &childev);
		931	#endif
		932
		933	ev_ref (EV_A); /* signal watcher */
		934	ev_io_stop (EV_A_ &sigev);
		935
		936	close (sigpipe [0]); sigpipe [0] = 0;
		937	close (sigpipe [1]); sigpipe [1] = 0;
		938
		939	loop_destroy (EV_A);
		940	}
		941
		942	void
		943	ev_default_fork (void)
		944	{
		945	#if EV_MULTIPLICITY
		946	struct ev_loop *loop = default_loop;
		947	#endif
		948
		949	if (method)
		950	postfork = 1;
		951	}
		952
		953	/*****************************************************************************/
		954
		955	static int
		956	any_pending (EV_P)
		957	{
		958	int pri;
		959
		960	for (pri = NUMPRI; pri--; )
		961	if (pendingcnt [pri])
		962	return 1;
		963
		964	return 0;
		965	}
		966
		967	static void
		968	call_pending (EV_P)
		969	{
		970	int pri;
		971
		972	for (pri = NUMPRI; pri--; )
		973	while (pendingcnt [pri])
		974	{
		975	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		976
		977	if (p->w)
		978	{
		979	p->w->pending = 0;
		980	EV_CB_INVOKE (p->w, p->events);
		981	}
403	}	982	}
404
405	pendingcnt = 0;
406	}	983	}
407		984
408	static void	985	static void
409	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	986	timers_reify (EV_P)
410	{	987	{
411	while (timercnt && timers [0]->at <= now)	988	while (timercnt && ((WT)timers [0])->at <= mn_now)
412	{	989	{
413	struct ev_timer *w = timers [0];	990	struct ev_timer *w = timers [0];
		991
		992	assert (("inactive timer on timer heap detected", ev_is_active (w)));
414		993
415	/* first reschedule or stop timer */	994	/* first reschedule or stop timer */
416	if (w->repeat)	995	if (w->repeat)
417	{	996	{
418	if (w->is_abs)	997	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
419	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	998
420	else
421	w->at = now + w->repeat;	999	((WT)w)->at += w->repeat;
		1000	if (((WT)w)->at < mn_now)
		1001	((WT)w)->at = mn_now;
422		1002
423	assert (w->at > now);
424
425	downheap (timers, timercnt, 0);	1003	downheap ((WT *)timers, timercnt, 0);
426	}	1004	}
427	else	1005	else
		1006	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1007
		1008	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1009	}
		1010	}
		1011
		1012	#if EV_PERIODICS
		1013	static void
		1014	periodics_reify (EV_P)
		1015	{
		1016	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1017	{
		1018	struct ev_periodic *w = periodics [0];
		1019
		1020	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1021
		1022	/* first reschedule or stop timer */
		1023	if (w->reschedule_cb)
428	{	1024	{
429	evtimer_stop (w); /* nonrepeating: stop timer */	1025	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
430	--timercnt; /* maybe pass by reference instead? */	1026
		1027	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1028	downheap ((WT *)periodics, periodiccnt, 0);
431	}	1029	}
		1030	else if (w->interval)
		1031	{
		1032	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1033	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1034	downheap ((WT *)periodics, periodiccnt, 0);
		1035	}
		1036	else
		1037	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
432		1038
433	event ((W)w, EV_TIMEOUT);	1039	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
434	}	1040	}
435	}	1041	}
436		1042
437	static void	1043	static void
438	time_update ()	1044	periodics_reschedule (EV_P)
439	{	1045	{
440	int i;	1046	int i;
		1047
		1048	/* adjust periodics after time jump */
		1049	for (i = 0; i < periodiccnt; ++i)
		1050	{
		1051	struct ev_periodic *w = periodics [i];
		1052
		1053	if (w->reschedule_cb)
		1054	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1055	else if (w->interval)
		1056	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1057	}
		1058
		1059	/* now rebuild the heap */
		1060	for (i = periodiccnt >> 1; i--; )
		1061	downheap ((WT *)periodics, periodiccnt, i);
		1062	}
		1063	#endif
		1064
		1065	inline int
		1066	time_update_monotonic (EV_P)
		1067	{
		1068	mn_now = get_clock ();
		1069
		1070	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1071	{
		1072	ev_rt_now = rtmn_diff + mn_now;
		1073	return 0;
		1074	}
		1075	else
		1076	{
		1077	now_floor = mn_now;
441	ev_now = ev_time ();	1078	ev_rt_now = ev_time ();
442		1079	return 1;
443	if (have_monotonic)
444	{	1080	}
445	ev_tstamp odiff = diff;	1081	}
446		1082
447	/* detecting time jumps is much more difficult */	1083	static void
448	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1084	time_update (EV_P)
		1085	{
		1086	int i;
		1087
		1088	#if EV_USE_MONOTONIC
		1089	if (expect_true (have_monotonic))
		1090	{
		1091	if (time_update_monotonic (EV_A))
449	{	1092	{
450	now = get_clock ();	1093	ev_tstamp odiff = rtmn_diff;
		1094
		1095	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1096	{
451	diff = ev_now - now;	1097	rtmn_diff = ev_rt_now - mn_now;
452		1098
453	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1099	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
454	return; /* all is well */	1100	return; /* all is well */
455		1101
456	ev_now = ev_time ();	1102	ev_rt_now = ev_time ();
		1103	mn_now = get_clock ();
		1104	now_floor = mn_now;
		1105	}
		1106
		1107	# if EV_PERIODICS
		1108	periodics_reschedule (EV_A);
		1109	# endif
		1110	/* no timer adjustment, as the monotonic clock doesn't jump */
		1111	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
457	}	1112	}
		1113	}
		1114	else
		1115	#endif
		1116	{
		1117	ev_rt_now = ev_time ();
458		1118
459	/* time jump detected, reschedule atimers */	1119	if (expect_false (mn_now > ev_rt_now \|\| mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
460	for (i = 0; i < atimercnt; ++i)
461	{	1120	{
462	struct ev_timer *w = atimers [i];	1121	#if EV_PERIODICS
463	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1122	periodics_reschedule (EV_A);
		1123	#endif
		1124
		1125	/* adjust timers. this is easy, as the offset is the same for all */
		1126	for (i = 0; i < timercnt; ++i)
		1127	((WT)timers [i])->at += ev_rt_now - mn_now;
464	}	1128	}
465	}
466	else
467	{
468	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
469	/* time jump detected, adjust rtimers */
470	for (i = 0; i < rtimercnt; ++i)
471	rtimers [i]->at += ev_now - now;
472		1129
473	now = ev_now;	1130	mn_now = ev_rt_now;
474	}	1131	}
475	}	1132	}
476		1133
477	int ev_loop_done;	1134	void
		1135	ev_ref (EV_P)
		1136	{
		1137	++activecnt;
		1138	}
478		1139
		1140	void
		1141	ev_unref (EV_P)
		1142	{
		1143	--activecnt;
		1144	}
		1145
		1146	static int loop_done;
		1147
		1148	void
479	void ev_loop (int flags)	1149	ev_loop (EV_P_ int flags)
480	{	1150	{
481	double block;	1151	double block;
482	ev_loop_done = flags & EVLOOP_ONESHOT;	1152	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
483
484	if (checkcnt)
485	{
486	queue_events ((W *)checks, checkcnt, EV_CHECK);
487	call_pending ();
488	}
489		1153
490	do	1154	do
491	{	1155	{
		1156	/* queue check watchers (and execute them) */
		1157	if (expect_false (preparecnt))
		1158	{
		1159	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1160	call_pending (EV_A);
		1161	}
		1162
		1163	/* we might have forked, so reify kernel state if necessary */
		1164	if (expect_false (postfork))
		1165	loop_fork (EV_A);
		1166
492	/* update fd-related kernel structures */	1167	/* update fd-related kernel structures */
493	fd_reify ();	1168	fd_reify (EV_A);
494		1169
495	/* calculate blocking time */	1170	/* calculate blocking time */
		1171
		1172	/* we only need this for !monotonic clock or timers, but as we basically
		1173	always have timers, we just calculate it always */
		1174	#if EV_USE_MONOTONIC
		1175	if (expect_true (have_monotonic))
		1176	time_update_monotonic (EV_A);
		1177	else
		1178	#endif
		1179	{
		1180	ev_rt_now = ev_time ();
		1181	mn_now = ev_rt_now;
		1182	}
		1183
496	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1184	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
497	block = 0.;	1185	block = 0.;
498	else	1186	else
499	{	1187	{
500	block = MAX_BLOCKTIME;	1188	block = MAX_BLOCKTIME;
501		1189
502	if (rtimercnt)	1190	if (timercnt)
503	{	1191	{
504	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1192	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
505	if (block > to) block = to;	1193	if (block > to) block = to;
506	}	1194	}
507		1195
		1196	#if EV_PERIODICS
508	if (atimercnt)	1197	if (periodiccnt)
509	{	1198	{
510	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1199	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
511	if (block > to) block = to;	1200	if (block > to) block = to;
512	}	1201	}
		1202	#endif
513		1203
514	if (block < 0.) block = 0.;	1204	if (block < 0.) block = 0.;
515	}	1205	}
516		1206
517	method_poll (block);	1207	method_poll (EV_A_ block);
518		1208
519	/* update ev_now, do magic */	1209	/* update ev_rt_now, do magic */
520	time_update ();	1210	time_update (EV_A);
521		1211
522	/* queue pending timers and reschedule them */	1212	/* queue pending timers and reschedule them */
523	/* absolute timers first */	1213	timers_reify (EV_A); /* relative timers called last */
524	timers_reify (atimers, atimercnt, ev_now);	1214	#if EV_PERIODICS
525	/* relative timers second */	1215	periodics_reify (EV_A); /* absolute timers called first */
526	timers_reify (rtimers, rtimercnt, now);	1216	#endif
527		1217
528	/* queue idle watchers unless io or timers are pending */	1218	/* queue idle watchers unless io or timers are pending */
529	if (!pendingcnt)	1219	if (idlecnt && !any_pending (EV_A))
530	queue_events ((W *)idles, idlecnt, EV_IDLE);	1220	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
531		1221
532	/* queue check and possibly idle watchers */	1222	/* queue check watchers, to be executed first */
		1223	if (checkcnt)
533	queue_events ((W *)checks, checkcnt, EV_CHECK);	1224	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
534		1225
535	call_pending ();	1226	call_pending (EV_A);
536	}	1227	}
537	while (!ev_loop_done);	1228	while (activecnt && !loop_done);
		1229
		1230	if (loop_done != 2)
		1231	loop_done = 0;
		1232	}
		1233
		1234	void
		1235	ev_unloop (EV_P_ int how)
		1236	{
		1237	loop_done = how;
538	}	1238	}
539		1239
540	/*****************************************************************************/	1240	/*****************************************************************************/
541		1241
542	static void	1242	inline void
543	wlist_add (WL *head, WL elem)	1243	wlist_add (WL *head, WL elem)
544	{	1244	{
545	elem->next = *head;	1245	elem->next = *head;
546	*head = elem;	1246	*head = elem;
547	}	1247	}
548		1248
549	static void	1249	inline void
550	wlist_del (WL *head, WL elem)	1250	wlist_del (WL *head, WL elem)
551	{	1251	{
552	while (*head)	1252	while (*head)
553	{	1253	{
554	if (*head == elem)	1254	if (*head == elem)
559		1259
560	head = &(*head)->next;	1260	head = &(*head)->next;
561	}	1261	}
562	}	1262	}
563		1263
564	static void	1264	inline void
		1265	ev_clear_pending (EV_P_ W w)
		1266	{
		1267	if (w->pending)
		1268	{
		1269	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1270	w->pending = 0;
		1271	}
		1272	}
		1273
		1274	inline void
565	ev_start (W w, int active)	1275	ev_start (EV_P_ W w, int active)
566	{	1276	{
567	w->pending = 0;	1277	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1278	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1279
568	w->active = active;	1280	w->active = active;
		1281	ev_ref (EV_A);
569	}	1282	}
570		1283
571	static void	1284	inline void
572	ev_stop (W w)	1285	ev_stop (EV_P_ W w)
573	{	1286	{
574	if (w->pending)	1287	ev_unref (EV_A);
575	pendings [w->pending - 1].w = 0;
576
577	w->active = 0;	1288	w->active = 0;
578	/* nop */
579	}	1289	}
580		1290
581	/*****************************************************************************/	1291	/*****************************************************************************/
582		1292
583	void	1293	void
584	evio_start (struct ev_io *w)	1294	ev_io_start (EV_P_ struct ev_io *w)
585	{	1295	{
		1296	int fd = w->fd;
		1297
586	if (ev_is_active (w))	1298	if (ev_is_active (w))
587	return;	1299	return;
588		1300
589	int fd = w->fd;	1301	assert (("ev_io_start called with negative fd", fd >= 0));
590		1302
591	ev_start ((W)w, 1);	1303	ev_start (EV_A_ (W)w, 1);
592	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1304	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
593	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1305	wlist_add ((WL *)&anfds[fd].head, (WL)w);
594		1306
595	++fdchangecnt;	1307	fd_change (EV_A_ fd);
596	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
597	fdchanges [fdchangecnt - 1] = fd;
598	}	1308	}
599		1309
600	void	1310	void
601	evio_stop (struct ev_io *w)	1311	ev_io_stop (EV_P_ struct ev_io *w)
602	{	1312	{
		1313	ev_clear_pending (EV_A_ (W)w);
603	if (!ev_is_active (w))	1314	if (!ev_is_active (w))
604	return;	1315	return;
605		1316
		1317	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1318
606	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1319	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
607	ev_stop ((W)w);	1320	ev_stop (EV_A_ (W)w);
608		1321
609	++fdchangecnt;	1322	fd_change (EV_A_ w->fd);
610	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
611	fdchanges [fdchangecnt - 1] = w->fd;
612	}	1323	}
613		1324
614	void	1325	void
615	evtimer_start (struct ev_timer *w)	1326	ev_timer_start (EV_P_ struct ev_timer *w)
616	{	1327	{
617	if (ev_is_active (w))	1328	if (ev_is_active (w))
618	return;	1329	return;
619		1330
620	if (w->is_abs)	1331	((WT)w)->at += mn_now;
		1332
		1333	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1334
		1335	ev_start (EV_A_ (W)w, ++timercnt);
		1336	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1337	timers [timercnt - 1] = w;
		1338	upheap ((WT *)timers, timercnt - 1);
		1339
		1340	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1341	}
		1342
		1343	void
		1344	ev_timer_stop (EV_P_ struct ev_timer *w)
		1345	{
		1346	ev_clear_pending (EV_A_ (W)w);
		1347	if (!ev_is_active (w))
		1348	return;
		1349
		1350	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1351
		1352	if (((W)w)->active < timercnt--)
		1353	{
		1354	timers [((W)w)->active - 1] = timers [timercnt];
		1355	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
621	{	1356	}
622	/* this formula differs from the one in timer_reify becuse we do not round up */	1357
		1358	((WT)w)->at -= mn_now;
		1359
		1360	ev_stop (EV_A_ (W)w);
		1361	}
		1362
		1363	void
		1364	ev_timer_again (EV_P_ struct ev_timer *w)
		1365	{
		1366	if (ev_is_active (w))
		1367	{
623	if (w->repeat)	1368	if (w->repeat)
624	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1369	{
625		1370	((WT)w)->at = mn_now + w->repeat;
626	ev_start ((W)w, ++atimercnt);	1371	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
627	array_needsize (atimers, atimermax, atimercnt, );	1372	}
628	atimers [atimercnt - 1] = w;
629	upheap (atimers, atimercnt - 1);
630	}
631	else	1373	else
		1374	ev_timer_stop (EV_A_ w);
632	{	1375	}
633	w->at += now;	1376	else if (w->repeat)
		1377	ev_timer_start (EV_A_ w);
		1378	}
634		1379
635	ev_start ((W)w, ++rtimercnt);	1380	#if EV_PERIODICS
636	array_needsize (rtimers, rtimermax, rtimercnt, );	1381	void
637	rtimers [rtimercnt - 1] = w;	1382	ev_periodic_start (EV_P_ struct ev_periodic *w)
638	upheap (rtimers, rtimercnt - 1);	1383	{
		1384	if (ev_is_active (w))
		1385	return;
		1386
		1387	if (w->reschedule_cb)
		1388	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1389	else if (w->interval)
639	}	1390	{
		1391	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1392	/* this formula differs from the one in periodic_reify because we do not always round up */
		1393	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1394	}
640		1395
641	}	1396	ev_start (EV_A_ (W)w, ++periodiccnt);
		1397	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1398	periodics [periodiccnt - 1] = w;
		1399	upheap ((WT *)periodics, periodiccnt - 1);
642		1400
		1401	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1402	}
		1403
643	void	1404	void
644	evtimer_stop (struct ev_timer *w)	1405	ev_periodic_stop (EV_P_ struct ev_periodic *w)
645	{	1406	{
		1407	ev_clear_pending (EV_A_ (W)w);
646	if (!ev_is_active (w))	1408	if (!ev_is_active (w))
647	return;	1409	return;
648		1410
649	if (w->is_abs)	1411	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
650	{	1412
651	if (w->active < atimercnt--)	1413	if (((W)w)->active < periodiccnt--)
652	{
653	atimers [w->active - 1] = atimers [atimercnt];
654	downheap (atimers, atimercnt, w->active - 1);
655	}
656	}	1414	{
657	else	1415	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1416	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
658	{	1417	}
659	if (w->active < rtimercnt--)
660	{
661	rtimers [w->active - 1] = rtimers [rtimercnt];
662	downheap (rtimers, rtimercnt, w->active - 1);
663	}
664	}
665		1418
666	ev_stop ((W)w);	1419	ev_stop (EV_A_ (W)w);
667	}	1420	}
668		1421
669	void	1422	void
670	evsignal_start (struct ev_signal *w)	1423	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1424	{
		1425	/* TODO: use adjustheap and recalculation */
		1426	ev_periodic_stop (EV_A_ w);
		1427	ev_periodic_start (EV_A_ w);
		1428	}
		1429	#endif
		1430
		1431	void
		1432	ev_idle_start (EV_P_ struct ev_idle *w)
671	{	1433	{
672	if (ev_is_active (w))	1434	if (ev_is_active (w))
673	return;	1435	return;
674		1436
		1437	ev_start (EV_A_ (W)w, ++idlecnt);
		1438	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1439	idles [idlecnt - 1] = w;
		1440	}
		1441
		1442	void
		1443	ev_idle_stop (EV_P_ struct ev_idle *w)
		1444	{
		1445	ev_clear_pending (EV_A_ (W)w);
		1446	if (!ev_is_active (w))
		1447	return;
		1448
		1449	idles [((W)w)->active - 1] = idles [--idlecnt];
		1450	ev_stop (EV_A_ (W)w);
		1451	}
		1452
		1453	void
		1454	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1455	{
		1456	if (ev_is_active (w))
		1457	return;
		1458
		1459	ev_start (EV_A_ (W)w, ++preparecnt);
		1460	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1461	prepares [preparecnt - 1] = w;
		1462	}
		1463
		1464	void
		1465	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1466	{
		1467	ev_clear_pending (EV_A_ (W)w);
		1468	if (!ev_is_active (w))
		1469	return;
		1470
		1471	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1472	ev_stop (EV_A_ (W)w);
		1473	}
		1474
		1475	void
		1476	ev_check_start (EV_P_ struct ev_check *w)
		1477	{
		1478	if (ev_is_active (w))
		1479	return;
		1480
		1481	ev_start (EV_A_ (W)w, ++checkcnt);
		1482	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1483	checks [checkcnt - 1] = w;
		1484	}
		1485
		1486	void
		1487	ev_check_stop (EV_P_ struct ev_check *w)
		1488	{
		1489	ev_clear_pending (EV_A_ (W)w);
		1490	if (!ev_is_active (w))
		1491	return;
		1492
		1493	checks [((W)w)->active - 1] = checks [--checkcnt];
		1494	ev_stop (EV_A_ (W)w);
		1495	}
		1496
		1497	#ifndef SA_RESTART
		1498	# define SA_RESTART 0
		1499	#endif
		1500
		1501	void
		1502	ev_signal_start (EV_P_ struct ev_signal *w)
		1503	{
		1504	#if EV_MULTIPLICITY
		1505	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1506	#endif
		1507	if (ev_is_active (w))
		1508	return;
		1509
		1510	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1511
675	ev_start ((W)w, 1);	1512	ev_start (EV_A_ (W)w, 1);
676	array_needsize (signals, signalmax, w->signum, signals_init);	1513	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
677	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1514	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
678		1515
679	if (!w->next)	1516	if (!((WL)w)->next)
680	{	1517	{
		1518	#if _WIN32
		1519	signal (w->signum, sighandler);
		1520	#else
681	struct sigaction sa;	1521	struct sigaction sa;
682	sa.sa_handler = sighandler;	1522	sa.sa_handler = sighandler;
683	sigfillset (&sa.sa_mask);	1523	sigfillset (&sa.sa_mask);
684	sa.sa_flags = 0;	1524	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
685	sigaction (w->signum, &sa, 0);	1525	sigaction (w->signum, &sa, 0);
		1526	#endif
686	}	1527	}
687	}	1528	}
688		1529
689	void	1530	void
690	evsignal_stop (struct ev_signal *w)	1531	ev_signal_stop (EV_P_ struct ev_signal *w)
691	{	1532	{
		1533	ev_clear_pending (EV_A_ (W)w);
692	if (!ev_is_active (w))	1534	if (!ev_is_active (w))
693	return;	1535	return;
694		1536
695	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1537	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
696	ev_stop ((W)w);	1538	ev_stop (EV_A_ (W)w);
697		1539
698	if (!signals [w->signum - 1].head)	1540	if (!signals [w->signum - 1].head)
699	signal (w->signum, SIG_DFL);	1541	signal (w->signum, SIG_DFL);
700	}	1542	}
701		1543
702	void evidle_start (struct ev_idle *w)	1544	void
		1545	ev_child_start (EV_P_ struct ev_child *w)
703	{	1546	{
		1547	#if EV_MULTIPLICITY
		1548	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1549	#endif
704	if (ev_is_active (w))	1550	if (ev_is_active (w))
705	return;	1551	return;
706		1552
707	ev_start ((W)w, ++idlecnt);	1553	ev_start (EV_A_ (W)w, 1);
708	array_needsize (idles, idlemax, idlecnt, );	1554	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
709	idles [idlecnt - 1] = w;
710	}	1555	}
711		1556
712	void evidle_stop (struct ev_idle *w)	1557	void
		1558	ev_child_stop (EV_P_ struct ev_child *w)
713	{	1559	{
714	idles [w->active - 1] = idles [--idlecnt];	1560	ev_clear_pending (EV_A_ (W)w);
715	ev_stop ((W)w);
716	}
717
718	void evcheck_start (struct ev_check *w)
719	{
720	if (ev_is_active (w))	1561	if (!ev_is_active (w))
721	return;	1562	return;
722		1563
723	ev_start ((W)w, ++checkcnt);	1564	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
724	array_needsize (checks, checkmax, checkcnt, );
725	checks [checkcnt - 1] = w;
726	}
727
728	void evcheck_stop (struct ev_check *w)
729	{
730	checks [w->active - 1] = checks [--checkcnt];
731	ev_stop ((W)w);	1565	ev_stop (EV_A_ (W)w);
732	}	1566	}
733		1567
734	/*****************************************************************************/	1568	/*****************************************************************************/
735		1569
736	#if 0	1570	struct ev_once
737
738	static void
739	sin_cb (struct ev_io *w, int revents)
740	{	1571	{
741	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
742	}
743
744	static void
745	ocb (struct ev_timer *w, int revents)
746	{
747	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
748	evtimer_stop (w);
749	evtimer_start (w);
750	}
751
752	static void
753	scb (struct ev_signal *w, int revents)
754	{
755	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
756	}
757
758	static void
759	gcb (struct ev_signal *w, int revents)
760	{
761	fprintf (stderr, "generic %x\n", revents);
762	}
763
764	int main (void)
765	{
766	struct ev_io sin;	1572	struct ev_io io;
767
768	ev_init (0);
769
770	evw_init (&sin, sin_cb, 55);
771	evio_set (&sin, 0, EV_READ);
772	evio_start (&sin);
773
774	struct ev_timer t[10000];
775
776	#if 0
777	int i;
778	for (i = 0; i < 10000; ++i)
779	{
780	struct ev_timer *w = t + i;
781	evw_init (w, ocb, i);
782	evtimer_set_abs (w, drand48 (), 0.99775533);
783	evtimer_start (w);
784	if (drand48 () < 0.5)
785	evtimer_stop (w);
786	}
787	#endif
788
789	struct ev_timer t1;	1573	struct ev_timer to;
790	evw_init (&t1, ocb, 0);	1574	void (cb)(int revents, void arg);
791	evtimer_set_abs (&t1, 5, 10);	1575	void *arg;
792	evtimer_start (&t1);	1576	};
793		1577
794	struct ev_signal sig;	1578	static void
795	evw_init (&sig, scb, 65535);	1579	once_cb (EV_P_ struct ev_once *once, int revents)
796	evsignal_set (&sig, SIGQUIT);	1580	{
797	evsignal_start (&sig);	1581	void (cb)(int revents, void arg) = once->cb;
		1582	void *arg = once->arg;
798		1583
799	struct ev_check cw;	1584	ev_io_stop (EV_A_ &once->io);
800	evw_init (&cw, gcb, 0);	1585	ev_timer_stop (EV_A_ &once->to);
801	evcheck_start (&cw);	1586	ev_free (once);
802		1587
803	struct ev_idle iw;	1588	cb (revents, arg);
804	evw_init (&iw, gcb, 0);
805	evidle_start (&iw);
806
807	ev_loop (0);
808
809	return 0;
810	}	1589	}
811		1590
812	#endif	1591	static void
		1592	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1593	{
		1594	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1595	}
813		1596
		1597	static void
		1598	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1599	{
		1600	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1601	}
814		1602
		1603	void
		1604	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1605	{
		1606	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
815		1607
		1608	if (!once)
		1609	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1610	else
		1611	{
		1612	once->cb = cb;
		1613	once->arg = arg;
816		1614
		1615	ev_init (&once->io, once_cb_io);
		1616	if (fd >= 0)
		1617	{
		1618	ev_io_set (&once->io, fd, events);
		1619	ev_io_start (EV_A_ &once->io);
		1620	}
		1621
		1622	ev_init (&once->to, once_cb_to);
		1623	if (timeout >= 0.)
		1624	{
		1625	ev_timer_set (&once->to, timeout, 0.);
		1626	ev_timer_start (EV_A_ &once->to);
		1627	}
		1628	}
		1629	}
		1630
		1631	#ifdef __cplusplus
		1632	}
		1633	#endif
		1634

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Comparing libev/ev.c (file contents): Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs. Revision 1.103 by root, Mon Nov 12 00:31:08 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.103 by root, Mon Nov 12 00:31:08 2007 UTC