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

Comparing libev/ev.c (file contents):
Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs.
Revision 1.104 by root, Mon Nov 12 00:39:45 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	#define HAVE_EPOLL 1	78	#include <signal.h>
15		79
16	#ifndef HAVE_MONOTONIC	80	#ifndef _WIN32
17	# ifdef CLOCK_MONOTONIC	81	# include <unistd.h>
18	# define HAVE_MONOTONIC 1	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
19	# endif	89	# endif
20	#endif	90	#endif
21		91
		92	/**/
		93
		94	#ifndef EV_USE_MONOTONIC
		95	# define EV_USE_MONOTONIC 1
		96	#endif
		97
22	#ifndef HAVE_SELECT	98	#ifndef EV_USE_SELECT
23	# define HAVE_SELECT 1	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
24	#endif	108	# endif
		109	#endif
25		110
26	#ifndef HAVE_EPOLL	111	#ifndef EV_USE_EPOLL
27	# define HAVE_EPOLL 0	112	# define EV_USE_EPOLL 0
28	#endif	113	#endif
29		114
		115	#ifndef EV_USE_KQUEUE
		116	# define EV_USE_KQUEUE 0
		117	#endif
		118
30	#ifndef HAVE_REALTIME	119	#ifndef EV_USE_REALTIME
31	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	120	# define EV_USE_REALTIME 1
32	#endif	121	#endif
		122
		123	/**/
		124
		125	#ifndef CLOCK_MONOTONIC
		126	# undef EV_USE_MONOTONIC
		127	# define EV_USE_MONOTONIC 0
		128	#endif
		129
		130	#ifndef CLOCK_REALTIME
		131	# undef EV_USE_REALTIME
		132	# define EV_USE_REALTIME 0
		133	#endif
		134
		135	#if EV_SELECT_IS_WINSOCKET
		136	# include <winsock.h>
		137	#endif
		138
		139	/**/
33		140
34	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	141	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
35	#define MAX_BLOCKTIME 60.	142	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		143	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		144	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
36		145
		146	#ifdef EV_H
		147	# include EV_H
		148	#else
37	#include "ev.h"	149	# include "ev.h"
		150	#endif
		151
		152	#if __GNUC__ >= 3
		153	# define expect(expr,value) __builtin_expect ((expr),(value))
		154	# define inline inline
		155	#else
		156	# define expect(expr,value) (expr)
		157	# define inline static
		158	#endif
		159
		160	#define expect_false(expr) expect ((expr) != 0, 0)
		161	#define expect_true(expr) expect ((expr) != 0, 1)
		162
		163	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		164	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		165
		166	#define EMPTY /* required for microsofts broken pseudo-c compiler */
38		167
39	typedef struct ev_watcher *W;	168	typedef struct ev_watcher *W;
40	typedef struct ev_watcher_list *WL;	169	typedef struct ev_watcher_list *WL;
41	typedef struct ev_watcher_time *WT;	170	typedef struct ev_watcher_time *WT;
42		171
43	static ev_tstamp now, diff; /* monotonic clock */	172	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		173
		174	#ifdef _WIN32
		175	# include "ev_win32.c"
		176	#endif
		177
		178	/*****************************************************************************/
		179
		180	static void (syserr_cb)(const char msg);
		181
		182	void ev_set_syserr_cb (void (cb)(const char msg))
		183	{
		184	syserr_cb = cb;
		185	}
		186
		187	static void
		188	syserr (const char *msg)
		189	{
		190	if (!msg)
		191	msg = "(libev) system error";
		192
		193	if (syserr_cb)
		194	syserr_cb (msg);
		195	else
		196	{
		197	perror (msg);
		198	abort ();
		199	}
		200	}
		201
		202	static void (alloc)(void *ptr, long size);
		203
		204	void ev_set_allocator (void (cb)(void *ptr, long size))
		205	{
		206	alloc = cb;
		207	}
		208
		209	static void *
		210	ev_realloc (void *ptr, long size)
		211	{
		212	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		213
		214	if (!ptr && size)
		215	{
		216	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		217	abort ();
		218	}
		219
		220	return ptr;
		221	}
		222
		223	#define ev_malloc(size) ev_realloc (0, (size))
		224	#define ev_free(ptr) ev_realloc ((ptr), 0)
		225
		226	/*****************************************************************************/
		227
		228	typedef struct
		229	{
		230	WL head;
		231	unsigned char events;
		232	unsigned char reify;
		233	#if EV_SELECT_IS_WINSOCKET
		234	SOCKET handle;
		235	#endif
		236	} ANFD;
		237
		238	typedef struct
		239	{
		240	W w;
		241	int events;
		242	} ANPENDING;
		243
		244	#if EV_MULTIPLICITY
		245
		246	struct ev_loop
		247	{
		248	ev_tstamp ev_rt_now;
		249	#define ev_rt_now ((loop)->ev_rt_now)
		250	#define VAR(name,decl) decl;
		251	#include "ev_vars.h"
		252	#undef VAR
		253	};
		254	#include "ev_wrap.h"
		255
		256	struct ev_loop default_loop_struct;
		257	static struct ev_loop *default_loop;
		258
		259	#else
		260
44	ev_tstamp ev_now;	261	ev_tstamp ev_rt_now;
45	int ev_method;	262	#define VAR(name,decl) static decl;
		263	#include "ev_vars.h"
		264	#undef VAR
46		265
47	static int have_monotonic; /* runtime */	266	static int default_loop;
48		267
49	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	268	#endif
50	static void (*method_modify)(int fd, int oev, int nev);
51	static void (*method_poll)(ev_tstamp timeout);
52		269
53	/*****************************************************************************/	270	/*****************************************************************************/
54		271
55	ev_tstamp	272	ev_tstamp
56	ev_time (void)	273	ev_time (void)
57	{	274	{
58	#if HAVE_REALTIME	275	#if EV_USE_REALTIME
59	struct timespec ts;	276	struct timespec ts;
60	clock_gettime (CLOCK_REALTIME, &ts);	277	clock_gettime (CLOCK_REALTIME, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	278	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	#else	279	#else
63	struct timeval tv;	280	struct timeval tv;
64	gettimeofday (&tv, 0);	281	gettimeofday (&tv, 0);
65	return tv.tv_sec + tv.tv_usec * 1e-6;	282	return tv.tv_sec + tv.tv_usec * 1e-6;
66	#endif	283	#endif
67	}	284	}
68		285
69	static ev_tstamp	286	inline ev_tstamp
70	get_clock (void)	287	get_clock (void)
71	{	288	{
72	#if HAVE_MONOTONIC	289	#if EV_USE_MONOTONIC
73	if (have_monotonic)	290	if (expect_true (have_monotonic))
74	{	291	{
75	struct timespec ts;	292	struct timespec ts;
76	clock_gettime (CLOCK_MONOTONIC, &ts);	293	clock_gettime (CLOCK_MONOTONIC, &ts);
77	return ts.tv_sec + ts.tv_nsec * 1e-9;	294	return ts.tv_sec + ts.tv_nsec * 1e-9;
78	}	295	}
79	#endif	296	#endif
80		297
81	return ev_time ();	298	return ev_time ();
82	}	299	}
83		300
		301	#if EV_MULTIPLICITY
		302	ev_tstamp
		303	ev_now (EV_P)
		304	{
		305	return ev_rt_now;
		306	}
		307	#endif
		308
		309	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		310
84	#define array_needsize(base,cur,cnt,init) \	311	#define array_needsize(type,base,cur,cnt,init) \
85	if ((cnt) > cur) \	312	if (expect_false ((cnt) > cur)) \
86	{ \	313	{ \
87	int newcnt = cur ? cur << 1 : 16; \	314	int newcnt = cur; \
88	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	315	do \
		316	{ \
		317	newcnt = array_roundsize (type, newcnt << 1); \
		318	} \
		319	while ((cnt) > newcnt); \
		320	\
89	base = realloc (base, sizeof (base) (newcnt)); \	321	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
90	init (base + cur, newcnt - cur); \	322	init (base + cur, newcnt - cur); \
91	cur = newcnt; \	323	cur = newcnt; \
92	}	324	}
		325
		326	#define array_slim(type,stem) \
		327	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		328	{ \
		329	stem ## max = array_roundsize (stem ## cnt >> 1); \
		330	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		331	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		332	}
		333
		334	#define array_free(stem, idx) \
		335	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
93		336
94	/*****************************************************************************/	337	/*****************************************************************************/
95		338
96	typedef struct
97	{
98	struct ev_io *head;
99	unsigned char wev, rev; /* want, received event set */
100	} ANFD;
101
102	static ANFD *anfds;
103	static int anfdmax;
104
105	static int *fdchanges;
106	static int fdchangemax, fdchangecnt;
107
108	static void	339	static void
109	anfds_init (ANFD *base, int count)	340	anfds_init (ANFD *base, int count)
110	{	341	{
111	while (count--)	342	while (count--)
112	{	343	{
113	base->head = 0;	344	base->head = 0;
114	base->wev = base->rev = EV_NONE;	345	base->events = EV_NONE;
		346	base->reify = 0;
		347
115	++base;	348	++base;
116	}	349	}
117	}	350	}
118		351
119	typedef struct	352	void
		353	ev_feed_event (EV_P_ void *w, int revents)
120	{	354	{
121	W w;	355	W w_ = (W)w;
122	int events;
123	} ANPENDING;
124		356
125	static ANPENDING *pendings;	357	if (w_->pending)
126	static int pendingmax, pendingcnt;	358	{
		359	pendings [ABSPRI (w_)][w_->pending - 1].events \|= revents;
		360	return;
		361	}
127		362
128	static void
129	event (W w, int events)
130	{
131	w->pending = ++pendingcnt;	363	w_->pending = ++pendingcnt [ABSPRI (w_)];
132	array_needsize (pendings, pendingmax, pendingcnt, );	364	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
133	pendings [pendingcnt - 1].w = w;	365	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
134	pendings [pendingcnt - 1].events = events;	366	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
135	}	367	}
136		368
137	static void	369	static void
		370	queue_events (EV_P_ W *events, int eventcnt, int type)
		371	{
		372	int i;
		373
		374	for (i = 0; i < eventcnt; ++i)
		375	ev_feed_event (EV_A_ events [i], type);
		376	}
		377
		378	inline void
138	fd_event (int fd, int events)	379	fd_event (EV_P_ int fd, int revents)
139	{	380	{
140	ANFD *anfd = anfds + fd;	381	ANFD *anfd = anfds + fd;
141	struct ev_io *w;	382	struct ev_io *w;
142		383
143	for (w = anfd->head; w; w = w->next)	384	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
144	{	385	{
145	int ev = w->events & events;	386	int ev = w->events & revents;
146		387
147	if (ev)	388	if (ev)
148	event ((W)w, ev);	389	ev_feed_event (EV_A_ (W)w, ev);
149	}	390	}
150	}	391	}
151		392
152	static void	393	void
153	queue_events (W *events, int eventcnt, int type)	394	ev_feed_fd_event (EV_P_ int fd, int revents)
154	{	395	{
155	int i;	396	fd_event (EV_A_ fd, revents);
156
157	for (i = 0; i < eventcnt; ++i)
158	event (events [i], type);
159	}	397	}
160		398
161	/*****************************************************************************/	399	/*****************************************************************************/
162		400
163	static struct ev_timer **timers;
164	static int timermax, timercnt;
165
166	static struct ev_periodic **periodics;
167	static int periodicmax, periodiccnt;
168
169	static void	401	static void
170	upheap (WT *timers, int k)	402	fd_reify (EV_P)
171	{
172	WT w = timers [k];
173
174	while (k && timers [k >> 1]->at > w->at)
175	{
176	timers [k] = timers [k >> 1];
177	timers [k]->active = k + 1;
178	k >>= 1;
179	}
180
181	timers [k] = w;
182	timers [k]->active = k + 1;
183
184	}
185
186	static void
187	downheap (WT *timers, int N, int k)
188	{
189	WT w = timers [k];
190
191	while (k < (N >> 1))
192	{
193	int j = k << 1;
194
195	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
196	++j;
197
198	if (w->at <= timers [j]->at)
199	break;
200
201	timers [k] = timers [j];
202	timers [k]->active = k + 1;
203	k = j;
204	}
205
206	timers [k] = w;
207	timers [k]->active = k + 1;
208	}
209
210	/*****************************************************************************/
211
212	typedef struct
213	{
214	struct ev_signal *head;
215	sig_atomic_t gotsig;
216	} ANSIG;
217
218	static ANSIG *signals;
219	static int signalmax;
220
221	static int sigpipe [2];
222	static sig_atomic_t gotsig;
223	static struct ev_io sigev;
224
225	static void
226	signals_init (ANSIG *base, int count)
227	{
228	while (count--)
229	{
230	base->head = 0;
231	base->gotsig = 0;
232	++base;
233	}
234	}
235
236	static void
237	sighandler (int signum)
238	{
239	signals [signum - 1].gotsig = 1;
240
241	if (!gotsig)
242	{
243	gotsig = 1;
244	write (sigpipe [1], &gotsig, 1);
245	}
246	}
247
248	static void
249	sigcb (struct ev_io *iow, int revents)
250	{
251	struct ev_signal *w;
252	int sig;
253
254	gotsig = 0;
255	read (sigpipe [0], &revents, 1);
256
257	for (sig = signalmax; sig--; )
258	if (signals [sig].gotsig)
259	{
260	signals [sig].gotsig = 0;
261
262	for (w = signals [sig].head; w; w = w->next)
263	event ((W)w, EV_SIGNAL);
264	}
265	}
266
267	static void
268	siginit (void)
269	{
270	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
271	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
272
273	/* rather than sort out wether we really need nb, set it */
274	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
275	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
276
277	evio_set (&sigev, sigpipe [0], EV_READ);
278	evio_start (&sigev);
279	}
280
281	/*****************************************************************************/
282
283	static struct ev_idle **idles;
284	static int idlemax, idlecnt;
285
286	static struct ev_check **checks;
287	static int checkmax, checkcnt;
288
289	/*****************************************************************************/
290
291	#if HAVE_EPOLL
292	# include "ev_epoll.c"
293	#endif
294	#if HAVE_SELECT
295	# include "ev_select.c"
296	#endif
297
298	int ev_init (int flags)
299	{
300	#if HAVE_MONOTONIC
301	{
302	struct timespec ts;
303	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
304	have_monotonic = 1;
305	}
306	#endif
307
308	ev_now = ev_time ();
309	now = get_clock ();
310	diff = ev_now - now;
311
312	if (pipe (sigpipe))
313	return 0;
314
315	ev_method = EVMETHOD_NONE;
316	#if HAVE_EPOLL
317	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
318	#endif
319	#if HAVE_SELECT
320	if (ev_method == EVMETHOD_NONE) select_init (flags);
321	#endif
322
323	if (ev_method)
324	{
325	evw_init (&sigev, sigcb);
326	siginit ();
327	}
328
329	return ev_method;
330	}
331
332	/*****************************************************************************/
333
334	void ev_prefork (void)
335	{
336	/* nop */
337	}
338
339	void ev_postfork_parent (void)
340	{
341	/* nop */
342	}
343
344	void ev_postfork_child (void)
345	{
346	#if HAVE_EPOLL
347	if (ev_method == EVMETHOD_EPOLL)
348	epoll_postfork_child ();
349	#endif
350
351	evio_stop (&sigev);
352	close (sigpipe [0]);
353	close (sigpipe [1]);
354	pipe (sigpipe);
355	siginit ();
356	}
357
358	/*****************************************************************************/
359
360	static void
361	fd_reify (void)
362	{	403	{
363	int i;	404	int i;
364		405
365	for (i = 0; i < fdchangecnt; ++i)	406	for (i = 0; i < fdchangecnt; ++i)
366	{	407	{
367	int fd = fdchanges [i];	408	int fd = fdchanges [i];
368	ANFD *anfd = anfds + fd;	409	ANFD *anfd = anfds + fd;
369	struct ev_io *w;	410	struct ev_io *w;
370		411
371	int wev = 0;	412	int events = 0;
372		413
373	for (w = anfd->head; w; w = w->next)	414	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
374	wev \|= w->events;	415	events \|= w->events;
375		416
376	if (anfd->wev != wev)	417	#if EV_SELECT_IS_WINSOCKET
		418	if (events)
377	{	419	{
378	method_modify (fd, anfd->wev, wev);	420	unsigned long argp;
379	anfd->wev = wev;	421	anfd->handle = _get_osfhandle (fd);
		422	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
380	}	423	}
		424	#endif
		425
		426	anfd->reify = 0;
		427
		428	method_modify (EV_A_ fd, anfd->events, events);
		429	anfd->events = events;
381	}	430	}
382		431
383	fdchangecnt = 0;	432	fdchangecnt = 0;
384	}	433	}
385		434
386	static void	435	static void
387	call_pending ()	436	fd_change (EV_P_ int fd)
		437	{
		438	if (anfds [fd].reify)
		439	return;
		440
		441	anfds [fd].reify = 1;
		442
		443	++fdchangecnt;
		444	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		445	fdchanges [fdchangecnt - 1] = fd;
		446	}
		447
		448	static void
		449	fd_kill (EV_P_ int fd)
		450	{
		451	struct ev_io *w;
		452
		453	while ((w = (struct ev_io *)anfds [fd].head))
		454	{
		455	ev_io_stop (EV_A_ w);
		456	ev_feed_event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		457	}
		458	}
		459
		460	static int
		461	fd_valid (int fd)
		462	{
		463	#ifdef _WIN32
		464	return _get_osfhandle (fd) != -1;
		465	#else
		466	return fcntl (fd, F_GETFD) != -1;
		467	#endif
		468	}
		469
		470	/* called on EBADF to verify fds */
		471	static void
		472	fd_ebadf (EV_P)
		473	{
		474	int fd;
		475
		476	for (fd = 0; fd < anfdmax; ++fd)
		477	if (anfds [fd].events)
		478	if (!fd_valid (fd) == -1 && errno == EBADF)
		479	fd_kill (EV_A_ fd);
		480	}
		481
		482	/* called on ENOMEM in select/poll to kill some fds and retry */
		483	static void
		484	fd_enomem (EV_P)
		485	{
		486	int fd;
		487
		488	for (fd = anfdmax; fd--; )
		489	if (anfds [fd].events)
		490	{
		491	fd_kill (EV_A_ fd);
		492	return;
		493	}
		494	}
		495
		496	/* usually called after fork if method needs to re-arm all fds from scratch */
		497	static void
		498	fd_rearm_all (EV_P)
		499	{
		500	int fd;
		501
		502	/* this should be highly optimised to not do anything but set a flag */
		503	for (fd = 0; fd < anfdmax; ++fd)
		504	if (anfds [fd].events)
		505	{
		506	anfds [fd].events = 0;
		507	fd_change (EV_A_ fd);
		508	}
		509	}
		510
		511	/*****************************************************************************/
		512
		513	static void
		514	upheap (WT *heap, int k)
		515	{
		516	WT w = heap [k];
		517
		518	while (k && heap [k >> 1]->at > w->at)
		519	{
		520	heap [k] = heap [k >> 1];
		521	((W)heap [k])->active = k + 1;
		522	k >>= 1;
		523	}
		524
		525	heap [k] = w;
		526	((W)heap [k])->active = k + 1;
		527
		528	}
		529
		530	static void
		531	downheap (WT *heap, int N, int k)
		532	{
		533	WT w = heap [k];
		534
		535	while (k < (N >> 1))
		536	{
		537	int j = k << 1;
		538
		539	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		540	++j;
		541
		542	if (w->at <= heap [j]->at)
		543	break;
		544
		545	heap [k] = heap [j];
		546	((W)heap [k])->active = k + 1;
		547	k = j;
		548	}
		549
		550	heap [k] = w;
		551	((W)heap [k])->active = k + 1;
		552	}
		553
		554	inline void
		555	adjustheap (WT *heap, int N, int k)
		556	{
		557	upheap (heap, k);
		558	downheap (heap, N, k);
		559	}
		560
		561	/*****************************************************************************/
		562
		563	typedef struct
		564	{
		565	WL head;
		566	sig_atomic_t volatile gotsig;
		567	} ANSIG;
		568
		569	static ANSIG *signals;
		570	static int signalmax;
		571
		572	static int sigpipe [2];
		573	static sig_atomic_t volatile gotsig;
		574	static struct ev_io sigev;
		575
		576	static void
		577	signals_init (ANSIG *base, int count)
		578	{
		579	while (count--)
		580	{
		581	base->head = 0;
		582	base->gotsig = 0;
		583
		584	++base;
		585	}
		586	}
		587
		588	static void
		589	sighandler (int signum)
		590	{
		591	#if _WIN32
		592	signal (signum, sighandler);
		593	#endif
		594
		595	signals [signum - 1].gotsig = 1;
		596
		597	if (!gotsig)
		598	{
		599	int old_errno = errno;
		600	gotsig = 1;
		601	write (sigpipe [1], &signum, 1);
		602	errno = old_errno;
		603	}
		604	}
		605
		606	void
		607	ev_feed_signal_event (EV_P_ int signum)
		608	{
		609	WL w;
		610
		611	#if EV_MULTIPLICITY
		612	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		613	#endif
		614
		615	--signum;
		616
		617	if (signum < 0 \|\| signum >= signalmax)
		618	return;
		619
		620	signals [signum].gotsig = 0;
		621
		622	for (w = signals [signum].head; w; w = w->next)
		623	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		624	}
		625
		626	static void
		627	sigcb (EV_P_ struct ev_io *iow, int revents)
		628	{
		629	int signum;
		630
		631	read (sigpipe [0], &revents, 1);
		632	gotsig = 0;
		633
		634	for (signum = signalmax; signum--; )
		635	if (signals [signum].gotsig)
		636	ev_feed_signal_event (EV_A_ signum + 1);
		637	}
		638
		639	inline void
		640	fd_intern (int fd)
		641	{
		642	#ifdef _WIN32
		643	int arg = 1;
		644	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		645	#else
		646	fcntl (fd, F_SETFD, FD_CLOEXEC);
		647	fcntl (fd, F_SETFL, O_NONBLOCK);
		648	#endif
		649	}
		650
		651	static void
		652	siginit (EV_P)
		653	{
		654	fd_intern (sigpipe [0]);
		655	fd_intern (sigpipe [1]);
		656
		657	ev_io_set (&sigev, sigpipe [0], EV_READ);
		658	ev_io_start (EV_A_ &sigev);
		659	ev_unref (EV_A); /* child watcher should not keep loop alive */
		660	}
		661
		662	/*****************************************************************************/
		663
		664	static struct ev_child *childs [PID_HASHSIZE];
		665
		666	#ifndef _WIN32
		667
		668	static struct ev_signal childev;
		669
		670	#ifndef WCONTINUED
		671	# define WCONTINUED 0
		672	#endif
		673
		674	static void
		675	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		676	{
		677	struct ev_child *w;
		678
		679	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		680	if (w->pid == pid \|\| !w->pid)
		681	{
		682	ev_priority (w) = ev_priority (sw); /* need to do it now */
		683	w->rpid = pid;
		684	w->rstatus = status;
		685	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		686	}
		687	}
		688
		689	static void
		690	childcb (EV_P_ struct ev_signal *sw, int revents)
		691	{
		692	int pid, status;
		693
		694	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		695	{
		696	/* make sure we are called again until all childs have been reaped */
		697	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		698
		699	child_reap (EV_A_ sw, pid, pid, status);
		700	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		701	}
		702	}
		703
		704	#endif
		705
		706	/*****************************************************************************/
		707
		708	#if EV_USE_KQUEUE
		709	# include "ev_kqueue.c"
		710	#endif
		711	#if EV_USE_EPOLL
		712	# include "ev_epoll.c"
		713	#endif
		714	#if EV_USE_POLL
		715	# include "ev_poll.c"
		716	#endif
		717	#if EV_USE_SELECT
		718	# include "ev_select.c"
		719	#endif
		720
		721	int
		722	ev_version_major (void)
		723	{
		724	return EV_VERSION_MAJOR;
		725	}
		726
		727	int
		728	ev_version_minor (void)
		729	{
		730	return EV_VERSION_MINOR;
		731	}
		732
		733	/* return true if we are running with elevated privileges and should ignore env variables */
		734	static int
		735	enable_secure (void)
		736	{
		737	#ifdef _WIN32
		738	return 0;
		739	#else
		740	return getuid () != geteuid ()
		741	\|\| getgid () != getegid ();
		742	#endif
		743	}
		744
		745	int
		746	ev_method (EV_P)
		747	{
		748	return method;
		749	}
		750
		751	static void
		752	loop_init (EV_P_ int methods)
		753	{
		754	if (!method)
		755	{
		756	#if EV_USE_MONOTONIC
		757	{
		758	struct timespec ts;
		759	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		760	have_monotonic = 1;
		761	}
		762	#endif
		763
		764	ev_rt_now = ev_time ();
		765	mn_now = get_clock ();
		766	now_floor = mn_now;
		767	rtmn_diff = ev_rt_now - mn_now;
		768
		769	if (methods == EVMETHOD_AUTO)
		770	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		771	methods = atoi (getenv ("LIBEV_METHODS"));
		772	else
		773	methods = EVMETHOD_ANY;
		774
		775	method = 0;
		776	#if EV_USE_KQUEUE
		777	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		778	#endif
		779	#if EV_USE_EPOLL
		780	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		781	#endif
		782	#if EV_USE_POLL
		783	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		784	#endif
		785	#if EV_USE_SELECT
		786	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		787	#endif
		788
		789	ev_init (&sigev, sigcb);
		790	ev_set_priority (&sigev, EV_MAXPRI);
		791	}
		792	}
		793
		794	void
		795	loop_destroy (EV_P)
388	{	796	{
389	int i;	797	int i;
390		798
391	for (i = 0; i < pendingcnt; ++i)	799	#if EV_USE_KQUEUE
		800	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		801	#endif
		802	#if EV_USE_EPOLL
		803	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		804	#endif
		805	#if EV_USE_POLL
		806	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		807	#endif
		808	#if EV_USE_SELECT
		809	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		810	#endif
		811
		812	for (i = NUMPRI; i--; )
		813	array_free (pending, [i]);
		814
		815	/* have to use the microsoft-never-gets-it-right macro */
		816	array_free (fdchange, EMPTY);
		817	array_free (timer, EMPTY);
		818	#if EV_PERIODICS
		819	array_free (periodic, EMPTY);
		820	#endif
		821	array_free (idle, EMPTY);
		822	array_free (prepare, EMPTY);
		823	array_free (check, EMPTY);
		824
		825	method = 0;
		826	}
		827
		828	static void
		829	loop_fork (EV_P)
		830	{
		831	#if EV_USE_EPOLL
		832	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		833	#endif
		834	#if EV_USE_KQUEUE
		835	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		836	#endif
		837
		838	if (ev_is_active (&sigev))
		839	{
		840	/* default loop */
		841
		842	ev_ref (EV_A);
		843	ev_io_stop (EV_A_ &sigev);
		844	close (sigpipe [0]);
		845	close (sigpipe [1]);
		846
		847	while (pipe (sigpipe))
		848	syserr ("(libev) error creating pipe");
		849
		850	siginit (EV_A);
392	{	851	}
393	ANPENDING *p = pendings + i;
394		852
395	if (p->w)	853	postfork = 0;
		854	}
		855
		856	#if EV_MULTIPLICITY
		857	struct ev_loop *
		858	ev_loop_new (int methods)
		859	{
		860	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		861
		862	memset (loop, 0, sizeof (struct ev_loop));
		863
		864	loop_init (EV_A_ methods);
		865
		866	if (ev_method (EV_A))
		867	return loop;
		868
		869	return 0;
		870	}
		871
		872	void
		873	ev_loop_destroy (EV_P)
		874	{
		875	loop_destroy (EV_A);
		876	ev_free (loop);
		877	}
		878
		879	void
		880	ev_loop_fork (EV_P)
		881	{
		882	postfork = 1;
		883	}
		884
		885	#endif
		886
		887	#if EV_MULTIPLICITY
		888	struct ev_loop *
		889	#else
		890	int
		891	#endif
		892	ev_default_loop (int methods)
		893	{
		894	if (sigpipe [0] == sigpipe [1])
		895	if (pipe (sigpipe))
		896	return 0;
		897
		898	if (!default_loop)
		899	{
		900	#if EV_MULTIPLICITY
		901	struct ev_loop *loop = default_loop = &default_loop_struct;
		902	#else
		903	default_loop = 1;
		904	#endif
		905
		906	loop_init (EV_A_ methods);
		907
		908	if (ev_method (EV_A))
396	{	909	{
397	p->w->pending = 0;	910	siginit (EV_A);
398	p->w->cb (p->w, p->events);	911
		912	#ifndef _WIN32
		913	ev_signal_init (&childev, childcb, SIGCHLD);
		914	ev_set_priority (&childev, EV_MAXPRI);
		915	ev_signal_start (EV_A_ &childev);
		916	ev_unref (EV_A); /* child watcher should not keep loop alive */
		917	#endif
399	}	918	}
		919	else
		920	default_loop = 0;
		921	}
		922
		923	return default_loop;
		924	}
		925
		926	void
		927	ev_default_destroy (void)
		928	{
		929	#if EV_MULTIPLICITY
		930	struct ev_loop *loop = default_loop;
		931	#endif
		932
		933	#ifndef _WIN32
		934	ev_ref (EV_A); /* child watcher */
		935	ev_signal_stop (EV_A_ &childev);
		936	#endif
		937
		938	ev_ref (EV_A); /* signal watcher */
		939	ev_io_stop (EV_A_ &sigev);
		940
		941	close (sigpipe [0]); sigpipe [0] = 0;
		942	close (sigpipe [1]); sigpipe [1] = 0;
		943
		944	loop_destroy (EV_A);
		945	}
		946
		947	void
		948	ev_default_fork (void)
		949	{
		950	#if EV_MULTIPLICITY
		951	struct ev_loop *loop = default_loop;
		952	#endif
		953
		954	if (method)
		955	postfork = 1;
		956	}
		957
		958	/*****************************************************************************/
		959
		960	static int
		961	any_pending (EV_P)
		962	{
		963	int pri;
		964
		965	for (pri = NUMPRI; pri--; )
		966	if (pendingcnt [pri])
		967	return 1;
		968
		969	return 0;
		970	}
		971
		972	static void
		973	call_pending (EV_P)
		974	{
		975	int pri;
		976
		977	for (pri = NUMPRI; pri--; )
		978	while (pendingcnt [pri])
		979	{
		980	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		981
		982	if (p->w)
		983	{
		984	p->w->pending = 0;
		985	EV_CB_INVOKE (p->w, p->events);
		986	}
400	}	987	}
401
402	pendingcnt = 0;
403	}	988	}
404		989
405	static void	990	static void
406	timers_reify ()	991	timers_reify (EV_P)
407	{	992	{
408	while (timercnt && timers [0]->at <= now)	993	while (timercnt && ((WT)timers [0])->at <= mn_now)
409	{	994	{
410	struct ev_timer *w = timers [0];	995	struct ev_timer *w = timers [0];
		996
		997	assert (("inactive timer on timer heap detected", ev_is_active (w)));
411		998
412	/* first reschedule or stop timer */	999	/* first reschedule or stop timer */
413	if (w->repeat)	1000	if (w->repeat)
414	{	1001	{
		1002	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		1003
415	w->at = now + w->repeat;	1004	((WT)w)->at += w->repeat;
416	assert (("timer timeout in the past, negative repeat?", w->at > now));	1005	if (((WT)w)->at < mn_now)
		1006	((WT)w)->at = mn_now;
		1007
417	downheap ((WT *)timers, timercnt, 0);	1008	downheap ((WT *)timers, timercnt, 0);
418	}	1009	}
419	else	1010	else
420	evtimer_stop (w); /* nonrepeating: stop timer */	1011	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
421		1012
422	event ((W)w, EV_TIMEOUT);	1013	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
423	}	1014	}
424	}	1015	}
425		1016
		1017	#if EV_PERIODICS
426	static void	1018	static void
427	periodics_reify ()	1019	periodics_reify (EV_P)
428	{	1020	{
429	while (periodiccnt && periodics [0]->at <= ev_now)	1021	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
430	{	1022	{
431	struct ev_periodic *w = periodics [0];	1023	struct ev_periodic *w = periodics [0];
432		1024
		1025	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1026
433	/* first reschedule or stop timer */	1027	/* first reschedule or stop timer */
434	if (w->interval)	1028	if (w->reschedule_cb)
435	{	1029	{
		1030	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1031
		1032	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1033	downheap ((WT *)periodics, periodiccnt, 0);
		1034	}
		1035	else if (w->interval)
		1036	{
436	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1037	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
437	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1038	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
438	downheap ((WT *)periodics, periodiccnt, 0);	1039	downheap ((WT *)periodics, periodiccnt, 0);
439	}	1040	}
440	else	1041	else
441	evperiodic_stop (w); /* nonrepeating: stop timer */	1042	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
442		1043
443	event ((W)w, EV_TIMEOUT);	1044	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
444	}	1045	}
445	}	1046	}
446		1047
447	static void	1048	static void
448	periodics_reschedule (ev_tstamp diff)	1049	periodics_reschedule (EV_P)
449	{	1050	{
450	int i;	1051	int i;
451		1052
452	/* adjust periodics after time jump */	1053	/* adjust periodics after time jump */
453	for (i = 0; i < periodiccnt; ++i)	1054	for (i = 0; i < periodiccnt; ++i)
454	{	1055	{
455	struct ev_periodic *w = periodics [i];	1056	struct ev_periodic *w = periodics [i];
456		1057
		1058	if (w->reschedule_cb)
		1059	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
457	if (w->interval)	1060	else if (w->interval)
		1061	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1062	}
		1063
		1064	/* now rebuild the heap */
		1065	for (i = periodiccnt >> 1; i--; )
		1066	downheap ((WT *)periodics, periodiccnt, i);
		1067	}
		1068	#endif
		1069
		1070	inline int
		1071	time_update_monotonic (EV_P)
		1072	{
		1073	mn_now = get_clock ();
		1074
		1075	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1076	{
		1077	ev_rt_now = rtmn_diff + mn_now;
		1078	return 0;
		1079	}
		1080	else
		1081	{
		1082	now_floor = mn_now;
		1083	ev_rt_now = ev_time ();
		1084	return 1;
		1085	}
		1086	}
		1087
		1088	static void
		1089	time_update (EV_P)
		1090	{
		1091	int i;
		1092
		1093	#if EV_USE_MONOTONIC
		1094	if (expect_true (have_monotonic))
		1095	{
		1096	if (time_update_monotonic (EV_A))
458	{	1097	{
459	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1098	ev_tstamp odiff = rtmn_diff;
460		1099
461	if (fabs (diff) >= 1e-4)	1100	for (i = 4; --i; ) /* loop a few times, before making important decisions */
462	{	1101	{
463	evperiodic_stop (w);	1102	rtmn_diff = ev_rt_now - mn_now;
464	evperiodic_start (w);
465		1103
466	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1104	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1105	return; /* all is well */
		1106
		1107	ev_rt_now = ev_time ();
		1108	mn_now = get_clock ();
		1109	now_floor = mn_now;
467	}	1110	}
		1111
		1112	# if EV_PERIODICS
		1113	periodics_reschedule (EV_A);
		1114	# endif
		1115	/* no timer adjustment, as the monotonic clock doesn't jump */
		1116	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
468	}	1117	}
469	}	1118	}
470	}	1119	else
471		1120	#endif
472	static void	1121	{
473	time_update ()
474	{
475	int i;
476
477	ev_now = ev_time ();	1122	ev_rt_now = ev_time ();
478		1123
479	if (have_monotonic)	1124	if (expect_false (mn_now > ev_rt_now \|\| mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
480	{
481	ev_tstamp odiff = diff;
482
483	for (i = 4; --i; ) /* loop a few times, before making important decisions */
484	{	1125	{
485	now = get_clock ();	1126	#if EV_PERIODICS
486	diff = ev_now - now;
487
488	if (fabs (odiff - diff) < MIN_TIMEJUMP)
489	return; /* all is well */
490
491	ev_now = ev_time ();
492	}
493
494	periodics_reschedule (diff - odiff);
495	/* no timer adjustment, as the monotonic clock doesn't jump */
496	}
497	else
498	{
499	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
500	{
501	periodics_reschedule (ev_now - now);	1127	periodics_reschedule (EV_A);
		1128	#endif
502		1129
503	/* adjust timers. this is easy, as the offset is the same for all */	1130	/* adjust timers. this is easy, as the offset is the same for all */
504	for (i = 0; i < timercnt; ++i)	1131	for (i = 0; i < timercnt; ++i)
505	timers [i]->at += diff;	1132	((WT)timers [i])->at += ev_rt_now - mn_now;
506	}	1133	}
507		1134
508	now = ev_now;	1135	mn_now = ev_rt_now;
509	}	1136	}
510	}	1137	}
511		1138
512	int ev_loop_done;	1139	void
		1140	ev_ref (EV_P)
		1141	{
		1142	++activecnt;
		1143	}
513		1144
		1145	void
		1146	ev_unref (EV_P)
		1147	{
		1148	--activecnt;
		1149	}
		1150
		1151	static int loop_done;
		1152
		1153	void
514	void ev_loop (int flags)	1154	ev_loop (EV_P_ int flags)
515	{	1155	{
516	double block;	1156	double block;
517	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1157	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
518
519	if (checkcnt)
520	{
521	queue_events ((W *)checks, checkcnt, EV_CHECK);
522	call_pending ();
523	}
524		1158
525	do	1159	do
526	{	1160	{
		1161	/* queue check watchers (and execute them) */
		1162	if (expect_false (preparecnt))
		1163	{
		1164	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1165	call_pending (EV_A);
		1166	}
		1167
		1168	/* we might have forked, so reify kernel state if necessary */
		1169	if (expect_false (postfork))
		1170	loop_fork (EV_A);
		1171
527	/* update fd-related kernel structures */	1172	/* update fd-related kernel structures */
528	fd_reify ();	1173	fd_reify (EV_A);
529		1174
530	/* calculate blocking time */	1175	/* calculate blocking time */
531		1176
532	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1177	/* we only need this for !monotonic clock or timers, but as we basically
		1178	always have timers, we just calculate it always */
		1179	#if EV_USE_MONOTONIC
		1180	if (expect_true (have_monotonic))
		1181	time_update_monotonic (EV_A);
		1182	else
		1183	#endif
		1184	{
533	ev_now = ev_time ();	1185	ev_rt_now = ev_time ();
		1186	mn_now = ev_rt_now;
		1187	}
534		1188
535	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1189	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
536	block = 0.;	1190	block = 0.;
537	else	1191	else
538	{	1192	{
539	block = MAX_BLOCKTIME;	1193	block = MAX_BLOCKTIME;
540		1194
541	if (timercnt)	1195	if (timercnt)
542	{	1196	{
543	ev_tstamp to = timers [0]->at - get_clock () + method_fudge;	1197	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
544	if (block > to) block = to;	1198	if (block > to) block = to;
545	}	1199	}
546		1200
		1201	#if EV_PERIODICS
547	if (periodiccnt)	1202	if (periodiccnt)
548	{	1203	{
549	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1204	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
550	if (block > to) block = to;	1205	if (block > to) block = to;
551	}	1206	}
		1207	#endif
552		1208
553	if (block < 0.) block = 0.;	1209	if (block < 0.) block = 0.;
554	}	1210	}
555		1211
556	method_poll (block);	1212	method_poll (EV_A_ block);
557		1213
558	/* update ev_now, do magic */	1214	/* update ev_rt_now, do magic */
559	time_update ();	1215	time_update (EV_A);
560		1216
561	/* queue pending timers and reschedule them */	1217	/* queue pending timers and reschedule them */
		1218	timers_reify (EV_A); /* relative timers called last */
		1219	#if EV_PERIODICS
562	periodics_reify (); /* absolute timers first */	1220	periodics_reify (EV_A); /* absolute timers called first */
563	timers_reify (); /* relative timers second */	1221	#endif
564		1222
565	/* queue idle watchers unless io or timers are pending */	1223	/* queue idle watchers unless io or timers are pending */
566	if (!pendingcnt)	1224	if (idlecnt && !any_pending (EV_A))
567	queue_events ((W *)idles, idlecnt, EV_IDLE);	1225	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
568		1226
569	/* queue check and possibly idle watchers */	1227	/* queue check watchers, to be executed first */
		1228	if (checkcnt)
570	queue_events ((W *)checks, checkcnt, EV_CHECK);	1229	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
571		1230
572	call_pending ();	1231	call_pending (EV_A);
573	}	1232	}
574	while (!ev_loop_done);	1233	while (activecnt && !loop_done);
575		1234
576	if (ev_loop_done != 2)	1235	if (loop_done != 2)
577	ev_loop_done = 0;	1236	loop_done = 0;
		1237	}
		1238
		1239	void
		1240	ev_unloop (EV_P_ int how)
		1241	{
		1242	loop_done = how;
578	}	1243	}
579		1244
580	/*****************************************************************************/	1245	/*****************************************************************************/
581		1246
582	static void	1247	inline void
583	wlist_add (WL *head, WL elem)	1248	wlist_add (WL *head, WL elem)
584	{	1249	{
585	elem->next = *head;	1250	elem->next = *head;
586	*head = elem;	1251	*head = elem;
587	}	1252	}
588		1253
589	static void	1254	inline void
590	wlist_del (WL *head, WL elem)	1255	wlist_del (WL *head, WL elem)
591	{	1256	{
592	while (*head)	1257	while (*head)
593	{	1258	{
594	if (*head == elem)	1259	if (*head == elem)
599		1264
600	head = &(*head)->next;	1265	head = &(*head)->next;
601	}	1266	}
602	}	1267	}
603		1268
604	static void	1269	inline void
		1270	ev_clear_pending (EV_P_ W w)
		1271	{
		1272	if (w->pending)
		1273	{
		1274	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1275	w->pending = 0;
		1276	}
		1277	}
		1278
		1279	inline void
605	ev_start (W w, int active)	1280	ev_start (EV_P_ W w, int active)
606	{	1281	{
607	w->pending = 0;	1282	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1283	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1284
608	w->active = active;	1285	w->active = active;
		1286	ev_ref (EV_A);
609	}	1287	}
610		1288
611	static void	1289	inline void
612	ev_stop (W w)	1290	ev_stop (EV_P_ W w)
613	{	1291	{
614	if (w->pending)	1292	ev_unref (EV_A);
615	pendings [w->pending - 1].w = 0;
616
617	w->active = 0;	1293	w->active = 0;
618	}	1294	}
619		1295
620	/*****************************************************************************/	1296	/*****************************************************************************/
621		1297
622	void	1298	void
623	evio_start (struct ev_io *w)	1299	ev_io_start (EV_P_ struct ev_io *w)
624	{	1300	{
		1301	int fd = w->fd;
		1302
625	if (ev_is_active (w))	1303	if (ev_is_active (w))
626	return;	1304	return;
627		1305
628	int fd = w->fd;	1306	assert (("ev_io_start called with negative fd", fd >= 0));
629		1307
630	ev_start ((W)w, 1);	1308	ev_start (EV_A_ (W)w, 1);
631	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1309	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
632	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1310	wlist_add ((WL *)&anfds[fd].head, (WL)w);
633		1311
634	++fdchangecnt;	1312	fd_change (EV_A_ fd);
635	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
636	fdchanges [fdchangecnt - 1] = fd;
637	}	1313	}
638		1314
639	void	1315	void
640	evio_stop (struct ev_io *w)	1316	ev_io_stop (EV_P_ struct ev_io *w)
641	{	1317	{
		1318	ev_clear_pending (EV_A_ (W)w);
642	if (!ev_is_active (w))	1319	if (!ev_is_active (w))
643	return;	1320	return;
644		1321
		1322	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1323
645	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1324	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
646	ev_stop ((W)w);	1325	ev_stop (EV_A_ (W)w);
647		1326
648	++fdchangecnt;	1327	fd_change (EV_A_ w->fd);
649	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
650	fdchanges [fdchangecnt - 1] = w->fd;
651	}	1328	}
652		1329
653
654	void	1330	void
655	evtimer_start (struct ev_timer *w)	1331	ev_timer_start (EV_P_ struct ev_timer *w)
656	{	1332	{
657	if (ev_is_active (w))	1333	if (ev_is_active (w))
658	return;	1334	return;
659		1335
660	w->at += now;	1336	((WT)w)->at += mn_now;
661		1337
662	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1338	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
663		1339
664	ev_start ((W)w, ++timercnt);	1340	ev_start (EV_A_ (W)w, ++timercnt);
665	array_needsize (timers, timermax, timercnt, );	1341	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
666	timers [timercnt - 1] = w;	1342	timers [timercnt - 1] = w;
667	upheap ((WT *)timers, timercnt - 1);	1343	upheap ((WT *)timers, timercnt - 1);
668	}
669		1344
		1345	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1346	}
		1347
670	void	1348	void
671	evtimer_stop (struct ev_timer *w)	1349	ev_timer_stop (EV_P_ struct ev_timer *w)
672	{	1350	{
		1351	ev_clear_pending (EV_A_ (W)w);
673	if (!ev_is_active (w))	1352	if (!ev_is_active (w))
674	return;	1353	return;
675		1354
		1355	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1356
676	if (w->active < timercnt--)	1357	if (((W)w)->active < timercnt--)
677	{	1358	{
678	timers [w->active - 1] = timers [timercnt];	1359	timers [((W)w)->active - 1] = timers [timercnt];
679	downheap ((WT *)timers, timercnt, w->active - 1);	1360	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
680	}	1361	}
681		1362
		1363	((WT)w)->at -= mn_now;
		1364
682	ev_stop ((W)w);	1365	ev_stop (EV_A_ (W)w);
683	}	1366	}
684		1367
685	void	1368	void
686	evperiodic_start (struct ev_periodic *w)	1369	ev_timer_again (EV_P_ struct ev_timer *w)
687	{	1370	{
688	if (ev_is_active (w))	1371	if (ev_is_active (w))
689	return;	1372	{
		1373	if (w->repeat)
		1374	{
		1375	((WT)w)->at = mn_now + w->repeat;
		1376	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1377	}
		1378	else
		1379	ev_timer_stop (EV_A_ w);
		1380	}
		1381	else if (w->repeat)
		1382	ev_timer_start (EV_A_ w);
		1383	}
690		1384
691	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1385	#if EV_PERIODICS
		1386	void
		1387	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1388	{
		1389	if (ev_is_active (w))
		1390	return;
692		1391
		1392	if (w->reschedule_cb)
		1393	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1394	else if (w->interval)
		1395	{
		1396	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
693	/* this formula differs from the one in periodic_reify because we do not always round up */	1397	/* this formula differs from the one in periodic_reify because we do not always round up */
694	if (w->interval)
695	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1398	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1399	}
696		1400
697	ev_start ((W)w, ++periodiccnt);	1401	ev_start (EV_A_ (W)w, ++periodiccnt);
698	array_needsize (periodics, periodicmax, periodiccnt, );	1402	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
699	periodics [periodiccnt - 1] = w;	1403	periodics [periodiccnt - 1] = w;
700	upheap ((WT *)periodics, periodiccnt - 1);	1404	upheap ((WT *)periodics, periodiccnt - 1);
701	}
702		1405
		1406	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1407	}
		1408
703	void	1409	void
704	evperiodic_stop (struct ev_periodic *w)	1410	ev_periodic_stop (EV_P_ struct ev_periodic *w)
705	{	1411	{
		1412	ev_clear_pending (EV_A_ (W)w);
706	if (!ev_is_active (w))	1413	if (!ev_is_active (w))
707	return;	1414	return;
708		1415
		1416	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1417
709	if (w->active < periodiccnt--)	1418	if (((W)w)->active < periodiccnt--)
710	{	1419	{
711	periodics [w->active - 1] = periodics [periodiccnt];	1420	periodics [((W)w)->active - 1] = periodics [periodiccnt];
712	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1421	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
713	}	1422	}
714		1423
715	ev_stop ((W)w);	1424	ev_stop (EV_A_ (W)w);
716	}	1425	}
717		1426
718	void	1427	void
719	evsignal_start (struct ev_signal *w)	1428	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1429	{
		1430	/* TODO: use adjustheap and recalculation */
		1431	ev_periodic_stop (EV_A_ w);
		1432	ev_periodic_start (EV_A_ w);
		1433	}
		1434	#endif
		1435
		1436	void
		1437	ev_idle_start (EV_P_ struct ev_idle *w)
720	{	1438	{
721	if (ev_is_active (w))	1439	if (ev_is_active (w))
722	return;	1440	return;
723		1441
		1442	ev_start (EV_A_ (W)w, ++idlecnt);
		1443	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1444	idles [idlecnt - 1] = w;
		1445	}
		1446
		1447	void
		1448	ev_idle_stop (EV_P_ struct ev_idle *w)
		1449	{
		1450	ev_clear_pending (EV_A_ (W)w);
		1451	if (!ev_is_active (w))
		1452	return;
		1453
		1454	idles [((W)w)->active - 1] = idles [--idlecnt];
		1455	ev_stop (EV_A_ (W)w);
		1456	}
		1457
		1458	void
		1459	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1460	{
		1461	if (ev_is_active (w))
		1462	return;
		1463
		1464	ev_start (EV_A_ (W)w, ++preparecnt);
		1465	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1466	prepares [preparecnt - 1] = w;
		1467	}
		1468
		1469	void
		1470	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1471	{
		1472	ev_clear_pending (EV_A_ (W)w);
		1473	if (!ev_is_active (w))
		1474	return;
		1475
		1476	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1477	ev_stop (EV_A_ (W)w);
		1478	}
		1479
		1480	void
		1481	ev_check_start (EV_P_ struct ev_check *w)
		1482	{
		1483	if (ev_is_active (w))
		1484	return;
		1485
		1486	ev_start (EV_A_ (W)w, ++checkcnt);
		1487	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1488	checks [checkcnt - 1] = w;
		1489	}
		1490
		1491	void
		1492	ev_check_stop (EV_P_ struct ev_check *w)
		1493	{
		1494	ev_clear_pending (EV_A_ (W)w);
		1495	if (!ev_is_active (w))
		1496	return;
		1497
		1498	checks [((W)w)->active - 1] = checks [--checkcnt];
		1499	ev_stop (EV_A_ (W)w);
		1500	}
		1501
		1502	#ifndef SA_RESTART
		1503	# define SA_RESTART 0
		1504	#endif
		1505
		1506	void
		1507	ev_signal_start (EV_P_ struct ev_signal *w)
		1508	{
		1509	#if EV_MULTIPLICITY
		1510	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1511	#endif
		1512	if (ev_is_active (w))
		1513	return;
		1514
		1515	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1516
724	ev_start ((W)w, 1);	1517	ev_start (EV_A_ (W)w, 1);
725	array_needsize (signals, signalmax, w->signum, signals_init);	1518	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
726	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1519	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
727		1520
728	if (!w->next)	1521	if (!((WL)w)->next)
729	{	1522	{
		1523	#if _WIN32
		1524	signal (w->signum, sighandler);
		1525	#else
730	struct sigaction sa;	1526	struct sigaction sa;
731	sa.sa_handler = sighandler;	1527	sa.sa_handler = sighandler;
732	sigfillset (&sa.sa_mask);	1528	sigfillset (&sa.sa_mask);
733	sa.sa_flags = 0;	1529	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
734	sigaction (w->signum, &sa, 0);	1530	sigaction (w->signum, &sa, 0);
		1531	#endif
735	}	1532	}
736	}	1533	}
737		1534
738	void	1535	void
739	evsignal_stop (struct ev_signal *w)	1536	ev_signal_stop (EV_P_ struct ev_signal *w)
740	{	1537	{
		1538	ev_clear_pending (EV_A_ (W)w);
741	if (!ev_is_active (w))	1539	if (!ev_is_active (w))
742	return;	1540	return;
743		1541
744	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1542	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
745	ev_stop ((W)w);	1543	ev_stop (EV_A_ (W)w);
746		1544
747	if (!signals [w->signum - 1].head)	1545	if (!signals [w->signum - 1].head)
748	signal (w->signum, SIG_DFL);	1546	signal (w->signum, SIG_DFL);
749	}	1547	}
750		1548
751	void evidle_start (struct ev_idle *w)	1549	void
		1550	ev_child_start (EV_P_ struct ev_child *w)
752	{	1551	{
		1552	#if EV_MULTIPLICITY
		1553	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1554	#endif
753	if (ev_is_active (w))	1555	if (ev_is_active (w))
754	return;	1556	return;
755		1557
756	ev_start ((W)w, ++idlecnt);	1558	ev_start (EV_A_ (W)w, 1);
757	array_needsize (idles, idlemax, idlecnt, );	1559	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
758	idles [idlecnt - 1] = w;
759	}	1560	}
760		1561
761	void evidle_stop (struct ev_idle *w)	1562	void
		1563	ev_child_stop (EV_P_ struct ev_child *w)
762	{	1564	{
763	idles [w->active - 1] = idles [--idlecnt];	1565	ev_clear_pending (EV_A_ (W)w);
764	ev_stop ((W)w);
765	}
766
767	void evcheck_start (struct ev_check *w)
768	{
769	if (ev_is_active (w))	1566	if (!ev_is_active (w))
770	return;	1567	return;
771		1568
772	ev_start ((W)w, ++checkcnt);	1569	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
773	array_needsize (checks, checkmax, checkcnt, );
774	checks [checkcnt - 1] = w;
775	}
776
777	void evcheck_stop (struct ev_check *w)
778	{
779	checks [w->active - 1] = checks [--checkcnt];
780	ev_stop ((W)w);	1570	ev_stop (EV_A_ (W)w);
781	}	1571	}
782		1572
783	/*****************************************************************************/	1573	/*****************************************************************************/
784		1574
785	#if 0	1575	struct ev_once
786		1576	{
787	struct ev_io wio;	1577	struct ev_io io;
788
789	static void
790	sin_cb (struct ev_io *w, int revents)
791	{
792	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
793	}
794
795	static void
796	ocb (struct ev_timer *w, int revents)
797	{
798	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
799	evtimer_stop (w);
800	evtimer_start (w);
801	}
802
803	static void
804	scb (struct ev_signal *w, int revents)
805	{
806	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
807	evio_stop (&wio);
808	evio_start (&wio);
809	}
810
811	static void
812	gcb (struct ev_signal *w, int revents)
813	{
814	fprintf (stderr, "generic %x\n", revents);
815
816	}
817
818	int main (void)
819	{
820	ev_init (0);
821
822	evio_init (&wio, sin_cb, 0, EV_READ);
823	evio_start (&wio);
824
825	struct ev_timer t[10000];
826
827	#if 0
828	int i;
829	for (i = 0; i < 10000; ++i)
830	{
831	struct ev_timer *w = t + i;
832	evw_init (w, ocb, i);
833	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
834	evtimer_start (w);
835	if (drand48 () < 0.5)
836	evtimer_stop (w);
837	}
838	#endif
839
840	struct ev_timer t1;	1578	struct ev_timer to;
841	evtimer_init (&t1, ocb, 5, 10);	1579	void (cb)(int revents, void arg);
842	evtimer_start (&t1);	1580	void *arg;
		1581	};
843		1582
844	struct ev_signal sig;	1583	static void
845	evsignal_init (&sig, scb, SIGQUIT);	1584	once_cb (EV_P_ struct ev_once *once, int revents)
846	evsignal_start (&sig);	1585	{
		1586	void (cb)(int revents, void arg) = once->cb;
		1587	void *arg = once->arg;
847		1588
848	struct ev_check cw;	1589	ev_io_stop (EV_A_ &once->io);
849	evcheck_init (&cw, gcb);	1590	ev_timer_stop (EV_A_ &once->to);
850	evcheck_start (&cw);	1591	ev_free (once);
851		1592
852	struct ev_idle iw;	1593	cb (revents, arg);
853	evidle_init (&iw, gcb);
854	evidle_start (&iw);
855
856	ev_loop (0);
857
858	return 0;
859	}	1594	}
860		1595
861	#endif	1596	static void
		1597	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1598	{
		1599	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1600	}
862		1601
		1602	static void
		1603	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1604	{
		1605	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1606	}
863		1607
		1608	void
		1609	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1610	{
		1611	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
864		1612
		1613	if (!once)
		1614	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1615	else
		1616	{
		1617	once->cb = cb;
		1618	once->arg = arg;
865		1619
		1620	ev_init (&once->io, once_cb_io);
		1621	if (fd >= 0)
		1622	{
		1623	ev_io_set (&once->io, fd, events);
		1624	ev_io_start (EV_A_ &once->io);
		1625	}
		1626
		1627	ev_init (&once->to, once_cb_to);
		1628	if (timeout >= 0.)
		1629	{
		1630	ev_timer_set (&once->to, timeout, 0.);
		1631	ev_timer_start (EV_A_ &once->to);
		1632	}
		1633	}
		1634	}
		1635
		1636	#ifdef __cplusplus
		1637	}
		1638	#endif
		1639

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Comparing libev/ev.c (file contents): Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs. Revision 1.104 by root, Mon Nov 12 00:39:45 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs.
Revision 1.104 by root, Mon Nov 12 00:39:45 2007 UTC