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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.111 by root, Mon Nov 12 06:34:49 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	68	#include <fcntl.h>
5	#include <signal.h>	69	#include <stddef.h>
6		70
7	#include <stdio.h>	71	#include <stdio.h>
8		72
9	#include <assert.h>	73	#include <assert.h>
10	#include <errno.h>	74	#include <errno.h>
11	#include <sys/time.h>	75	#include <sys/types.h>
12	#include <time.h>	76	#include <time.h>
13		77
		78	#include <signal.h>
		79
		80	#ifndef _WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#else
		85	# define WIN32_LEAN_AND_MEAN
		86	# include <windows.h>
		87	# ifndef EV_SELECT_IS_WINSOCKET
		88	# define EV_SELECT_IS_WINSOCKET 1
		89	# endif
		90	#endif
		91
		92	/**/
		93
		94	#ifndef EV_USE_MONOTONIC
		95	# define EV_USE_MONOTONIC 1
		96	#endif
		97
		98	#ifndef EV_USE_SELECT
		99	# define EV_USE_SELECT 1
		100	# define EV_SELECT_USE_FD_SET 1
		101	#endif
		102
		103	#ifndef EV_USE_POLL
		104	# ifdef _WIN32
		105	# define EV_USE_POLL 0
		106	# else
		107	# define EV_USE_POLL 1
		108	# endif
		109	#endif
		110
		111	#ifndef EV_USE_EPOLL
		112	# define EV_USE_EPOLL 0
		113	#endif
		114
		115	#ifndef EV_USE_KQUEUE
		116	# define EV_USE_KQUEUE 0
		117	#endif
		118
		119	#ifndef EV_USE_REALTIME
		120	# define EV_USE_REALTIME 1
		121	#endif
		122
		123	/**/
		124
		125	/* darwin simply cannot be helped */
		126	#ifdef __APPLE__
		127	# undef EV_USE_POLL
		128	# undef EV_USE_KQUEUE
		129	#endif
		130
14	#ifdef CLOCK_MONOTONIC	131	#ifndef CLOCK_MONOTONIC
		132	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	133	# define EV_USE_MONOTONIC 0
16	#endif	134	#endif
17		135
		136	#ifndef CLOCK_REALTIME
		137	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	138	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	139	#endif
20	#define HAVE_SELECT 1	140
		141	#if EV_SELECT_IS_WINSOCKET
		142	# include <winsock.h>
		143	#endif
		144
		145	/**/
21		146
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	147	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	148	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		149	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		150	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
24		151
		152	#ifdef EV_H
		153	# include EV_H
		154	#else
25	#include "ev.h"	155	# include "ev.h"
		156	#endif
26		157
		158	#if __GNUC__ >= 3
		159	# define expect(expr,value) __builtin_expect ((expr),(value))
		160	# define inline inline
		161	#else
		162	# define expect(expr,value) (expr)
		163	# define inline static
		164	#endif
		165
		166	#define expect_false(expr) expect ((expr) != 0, 0)
		167	#define expect_true(expr) expect ((expr) != 0, 1)
		168
		169	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		170	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		171
		172	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		173
27	struct ev_watcher {	174	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	175	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	176	typedef struct ev_watcher_time *WT;
33	};
34		177
35	static ev_tstamp now, diff; /* monotonic clock */	178	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		179
		180	#ifdef _WIN32
		181	# include "ev_win32.c"
		182	#endif
		183
		184	/*****************************************************************************/
		185
		186	static void (*syserr_cb)(const char *msg);
		187
		188	void ev_set_syserr_cb (void (*cb)(const char *msg))
		189	{
		190	syserr_cb = cb;
		191	}
		192
		193	static void
		194	syserr (const char *msg)
		195	{
		196	if (!msg)
		197	msg = "(libev) system error";
		198
		199	if (syserr_cb)
		200	syserr_cb (msg);
		201	else
		202	{
		203	perror (msg);
		204	abort ();
		205	}
		206	}
		207
		208	static void *(*alloc)(void *ptr, long size);
		209
		210	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		211	{
		212	alloc = cb;
		213	}
		214
		215	static void *
		216	ev_realloc (void *ptr, long size)
		217	{
		218	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		219
		220	if (!ptr && size)
		221	{
		222	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		223	abort ();
		224	}
		225
		226	return ptr;
		227	}
		228
		229	#define ev_malloc(size) ev_realloc (0, (size))
		230	#define ev_free(ptr) ev_realloc ((ptr), 0)
		231
		232	/*****************************************************************************/
		233
		234	typedef struct
		235	{
		236	WL head;
		237	unsigned char events;
		238	unsigned char reify;
		239	#if EV_SELECT_IS_WINSOCKET
		240	SOCKET handle;
		241	#endif
		242	} ANFD;
		243
		244	typedef struct
		245	{
		246	W w;
		247	int events;
		248	} ANPENDING;
		249
		250	#if EV_MULTIPLICITY
		251
		252	struct ev_loop
		253	{
		254	ev_tstamp ev_rt_now;
		255	#define ev_rt_now ((loop)->ev_rt_now)
		256	#define VAR(name,decl) decl;
		257	#include "ev_vars.h"
		258	#undef VAR
		259	};
		260	#include "ev_wrap.h"
		261
		262	struct ev_loop default_loop_struct;
		263	static struct ev_loop *default_loop;
		264
		265	#else
		266
36	ev_tstamp ev_now;	267	ev_tstamp ev_rt_now;
37	int ev_method;	268	#define VAR(name,decl) static decl;
		269	#include "ev_vars.h"
		270	#undef VAR
38		271
39	static int have_monotonic; /* runtime */	272	static int default_loop;
40		273
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	274	#endif
42	static void (*method_modify)(int fd, int oev, int nev);	275
43	static void (*method_poll)(ev_tstamp timeout);	276	/*****************************************************************************/
44		277
45	ev_tstamp	278	ev_tstamp
46	ev_time (void)	279	ev_time (void)
47	{	280	{
48	#if HAVE_REALTIME	281	#if EV_USE_REALTIME
49	struct timespec ts;	282	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	283	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	284	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	285	#else
53	struct timeval tv;	286	struct timeval tv;
54	gettimeofday (&tv, 0);	287	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	288	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	289	#endif
57	}	290	}
58		291
59	static ev_tstamp	292	inline ev_tstamp
60	get_clock (void)	293	get_clock (void)
61	{	294	{
62	#if HAVE_MONOTONIC	295	#if EV_USE_MONOTONIC
63	if (have_monotonic)	296	if (expect_true (have_monotonic))
64	{	297	{
65	struct timespec ts;	298	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	299	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	300	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	301	}
69	#endif	302	#endif
70		303
71	return ev_time ();	304	return ev_time ();
72	}	305	}
73		306
		307	#if EV_MULTIPLICITY
		308	ev_tstamp
		309	ev_now (EV_P)
		310	{
		311	return ev_rt_now;
		312	}
		313	#endif
		314
		315	#define array_roundsize(type,n) (((n) | 4) & ~3)
		316
74	#define array_needsize(base,cur,cnt,init) \	317	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	318	if (expect_false ((cnt) > cur)) \
76	{ \	319	{ \
77	int newcnt = cur ? cur << 1 : 16; \	320	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	321	do \
		322	{ \
		323	newcnt = array_roundsize (type, newcnt << 1); \
		324	} \
		325	while ((cnt) > newcnt); \
		326	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	327	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
80	init (base + cur, newcnt - cur); \	328	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	329	cur = newcnt; \
82	}	330	}
83		331
84	typedef struct	332	#define array_slim(type,stem) \
85	{	333	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	334	{ \
87	unsigned char wev, rev; /* want, received event set */	335	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	336	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		337	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		338	}
89		339
90	static ANFD *anfds;	340	#define array_free(stem, idx) \
91	static int anfdmax;	341	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
92		342
93	static int *fdchanges;	343	/*****************************************************************************/
94	static int fdchangemax, fdchangecnt;
95		344
96	static void	345	static void
97	anfds_init (ANFD *base, int count)	346	anfds_init (ANFD *base, int count)
98	{	347	{
99	while (count--)	348	while (count--)
100	{	349	{
101	base->head = 0;	350	base->head = 0;
102	base->wev = base->rev = EV_NONE;	351	base->events = EV_NONE;
		352	base->reify = 0;
		353
103	++base;	354	++base;
104	}	355	}
105	}	356	}
106		357
107	typedef struct	358	void
		359	ev_feed_event (EV_P_ void *w, int revents)
108	{	360	{
109	struct ev_watcher *w;	361	W w_ = (W)w;
110	int events;
111	} ANPENDING;
112		362
113	static ANPENDING *pendings;	363	if (w_->pending)
114	static int pendingmax, pendingcnt;	364	{
		365	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		366	return;
		367	}
115		368
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;	369	w_->pending = ++pendingcnt [ABSPRI (w_)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	370	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
121	pendings [pendingcnt - 1].w = w;	371	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
122	pendings [pendingcnt - 1].events = events;	372	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
123	}	373	}
124		374
125	static void	375	static void
		376	queue_events (EV_P_ W *events, int eventcnt, int type)
		377	{
		378	int i;
		379
		380	for (i = 0; i < eventcnt; ++i)
		381	ev_feed_event (EV_A_ events [i], type);
		382	}
		383
		384	inline void
126	fd_event (int fd, int events)	385	fd_event (EV_P_ int fd, int revents)
127	{	386	{
128	ANFD *anfd = anfds + fd;	387	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	388	struct ev_io *w;
130		389
131	for (w = anfd->head; w; w = w->next)	390	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	391	{
133	int ev = w->events & events;	392	int ev = w->events & revents;
134		393
135	if (ev)	394	if (ev)
136	event ((struct ev_watcher *)w, ev);	395	ev_feed_event (EV_A_ (W)w, ev);
137	}
138	}
139
140	static struct ev_timer **atimers;
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void
147	upheap (struct ev_timer **timers, int k)
148	{
149	struct ev_timer *w = timers [k];
150
151	while (k && timers [k >> 1]->at > w->at)
152	{
153	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;
155	k >>= 1;
156	}
157
158	timers [k] = w;
159	timers [k]->active = k + 1;
160
161	}
162
163	static void
164	downheap (struct ev_timer **timers, int N, int k)
165	{
166	struct ev_timer *w = timers [k];
167
168	while (k < (N >> 1))
169	{
170	int j = k << 1;
171
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173	++j;
174
175	if (w->at <= timers [j]->at)
176	break;
177
178	timers [k] = timers [j];
179	timers [k]->active = k + 1;
180	k = j;
181	}
182
183	timers [k] = w;
184	timers [k]->active = k + 1;
185	}
186
187	typedef struct
188	{
189	struct ev_signal *head;
190	sig_atomic_t gotsig;
191	} ANSIG;
192
193	static ANSIG *signals;
194	static int signalmax;
195
196	static int sigpipe [2];
197	static sig_atomic_t gotsig;
198	static struct ev_io sigev;
199
200	static void
201	signals_init (ANSIG *base, int count)
202	{
203	while (count--)
204	{
205	base->head = 0;
206	base->gotsig = 0;
207	++base;
208	}
209	}
210
211	static void
212	sighandler (int signum)
213	{
214	signals [signum - 1].gotsig = 1;
215
216	if (!gotsig)
217	{
218	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);
220	}
221	}
222
223	static void
224	sigcb (struct ev_io *iow, int revents)
225	{
226	struct ev_signal *w;
227	int sig;
228
229	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231
232	for (sig = signalmax; sig--; )
233	if (signals [sig].gotsig)
234	{
235	signals [sig].gotsig = 0;
236
237	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);
239	}	396	}
240	}	397	}
241		398
242	static void	399	void
243	siginit (void)	400	ev_feed_fd_event (EV_P_ int fd, int revents)
244	{	401	{
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	402	fd_event (EV_A_ fd, revents);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247
248	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
251
252	evio_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);
254	}	403	}
255		404
256	#if HAVE_EPOLL	405	/*****************************************************************************/
257	# include "ev_epoll.c"
258	#endif
259	#if HAVE_SELECT
260	# include "ev_select.c"
261	#endif
262		406
263	int ev_init (int flags)
264	{
265	#if HAVE_MONOTONIC
266	{
267	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;
270	}
271	#endif
272
273	ev_now = ev_time ();
274	now = get_clock ();
275	diff = ev_now - now;
276
277	if (pipe (sigpipe))
278	return 0;
279
280	ev_method = EVMETHOD_NONE;
281	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif
284	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif
287
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);
291	siginit ();
292	}
293
294	return ev_method;
295	}
296
297	void ev_prefork (void)
298	{
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void	407	static void
320	fd_reify (void)	408	fd_reify (EV_P)
321	{	409	{
322	int i;	410	int i;
323		411
324	for (i = 0; i < fdchangecnt; ++i)	412	for (i = 0; i < fdchangecnt; ++i)
325	{	413	{
326	int fd = fdchanges [i];	414	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;	415	ANFD *anfd = anfds + fd;
328	struct ev_io *w;	416	struct ev_io *w;
329		417
330	int wev = 0;	418	int events = 0;
331		419
332	for (w = anfd->head; w; w = w->next)	420	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
333	wev |= w->events;	421	events |= w->events;
334		422
335	if (anfd->wev != wev)	423	#if EV_SELECT_IS_WINSOCKET
		424	if (events)
336	{	425	{
337	method_modify (fd, anfd->wev, wev);	426	unsigned long argp;
338	anfd->wev = wev;	427	anfd->handle = _get_osfhandle (fd);
		428	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
339	}	429	}
		430	#endif
		431
		432	anfd->reify = 0;
		433
		434	method_modify (EV_A_ fd, anfd->events, events);
		435	anfd->events = events;
340	}	436	}
341		437
342	fdchangecnt = 0;	438	fdchangecnt = 0;
343	}	439	}
344		440
345	static void	441	static void
346	call_pending ()	442	fd_change (EV_P_ int fd)
		443	{
		444	if (anfds [fd].reify)
		445	return;
		446
		447	anfds [fd].reify = 1;
		448
		449	++fdchangecnt;
		450	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		451	fdchanges [fdchangecnt - 1] = fd;
		452	}
		453
		454	static void
		455	fd_kill (EV_P_ int fd)
		456	{
		457	struct ev_io *w;
		458
		459	while ((w = (struct ev_io *)anfds [fd].head))
		460	{
		461	ev_io_stop (EV_A_ w);
		462	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		463	}
		464	}
		465
		466	static int
		467	fd_valid (int fd)
		468	{
		469	#ifdef _WIN32
		470	return _get_osfhandle (fd) != -1;
		471	#else
		472	return fcntl (fd, F_GETFD) != -1;
		473	#endif
		474	}
		475
		476	/* called on EBADF to verify fds */
		477	static void
		478	fd_ebadf (EV_P)
		479	{
		480	int fd;
		481
		482	for (fd = 0; fd < anfdmax; ++fd)
		483	if (anfds [fd].events)
		484	if (!fd_valid (fd) == -1 && errno == EBADF)
		485	fd_kill (EV_A_ fd);
		486	}
		487
		488	/* called on ENOMEM in select/poll to kill some fds and retry */
		489	static void
		490	fd_enomem (EV_P)
		491	{
		492	int fd;
		493
		494	for (fd = anfdmax; fd--; )
		495	if (anfds [fd].events)
		496	{
		497	fd_kill (EV_A_ fd);
		498	return;
		499	}
		500	}
		501
		502	/* usually called after fork if method needs to re-arm all fds from scratch */
		503	static void
		504	fd_rearm_all (EV_P)
		505	{
		506	int fd;
		507
		508	/* this should be highly optimised to not do anything but set a flag */
		509	for (fd = 0; fd < anfdmax; ++fd)
		510	if (anfds [fd].events)
		511	{
		512	anfds [fd].events = 0;
		513	fd_change (EV_A_ fd);
		514	}
		515	}
		516
		517	/*****************************************************************************/
		518
		519	static void
		520	upheap (WT *heap, int k)
		521	{
		522	WT w = heap [k];
		523
		524	while (k && heap [k >> 1]->at > w->at)
		525	{
		526	heap [k] = heap [k >> 1];
		527	((W)heap [k])->active = k + 1;
		528	k >>= 1;
		529	}
		530
		531	heap [k] = w;
		532	((W)heap [k])->active = k + 1;
		533
		534	}
		535
		536	static void
		537	downheap (WT *heap, int N, int k)
		538	{
		539	WT w = heap [k];
		540
		541	while (k < (N >> 1))
		542	{
		543	int j = k << 1;
		544
		545	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		546	++j;
		547
		548	if (w->at <= heap [j]->at)
		549	break;
		550
		551	heap [k] = heap [j];
		552	((W)heap [k])->active = k + 1;
		553	k = j;
		554	}
		555
		556	heap [k] = w;
		557	((W)heap [k])->active = k + 1;
		558	}
		559
		560	inline void
		561	adjustheap (WT *heap, int N, int k)
		562	{
		563	upheap (heap, k);
		564	downheap (heap, N, k);
		565	}
		566
		567	/*****************************************************************************/
		568
		569	typedef struct
		570	{
		571	WL head;
		572	sig_atomic_t volatile gotsig;
		573	} ANSIG;
		574
		575	static ANSIG *signals;
		576	static int signalmax;
		577
		578	static int sigpipe [2];
		579	static sig_atomic_t volatile gotsig;
		580	static struct ev_io sigev;
		581
		582	static void
		583	signals_init (ANSIG *base, int count)
		584	{
		585	while (count--)
		586	{
		587	base->head = 0;
		588	base->gotsig = 0;
		589
		590	++base;
		591	}
		592	}
		593
		594	static void
		595	sighandler (int signum)
		596	{
		597	#if _WIN32
		598	signal (signum, sighandler);
		599	#endif
		600
		601	signals [signum - 1].gotsig = 1;
		602
		603	if (!gotsig)
		604	{
		605	int old_errno = errno;
		606	gotsig = 1;
		607	write (sigpipe [1], &signum, 1);
		608	errno = old_errno;
		609	}
		610	}
		611
		612	void
		613	ev_feed_signal_event (EV_P_ int signum)
		614	{
		615	WL w;
		616
		617	#if EV_MULTIPLICITY
		618	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		619	#endif
		620
		621	--signum;
		622
		623	if (signum < 0 || signum >= signalmax)
		624	return;
		625
		626	signals [signum].gotsig = 0;
		627
		628	for (w = signals [signum].head; w; w = w->next)
		629	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		630	}
		631
		632	static void
		633	sigcb (EV_P_ struct ev_io *iow, int revents)
		634	{
		635	int signum;
		636
		637	read (sigpipe [0], &revents, 1);
		638	gotsig = 0;
		639
		640	for (signum = signalmax; signum--; )
		641	if (signals [signum].gotsig)
		642	ev_feed_signal_event (EV_A_ signum + 1);
		643	}
		644
		645	inline void
		646	fd_intern (int fd)
		647	{
		648	#ifdef _WIN32
		649	int arg = 1;
		650	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		651	#else
		652	fcntl (fd, F_SETFD, FD_CLOEXEC);
		653	fcntl (fd, F_SETFL, O_NONBLOCK);
		654	#endif
		655	}
		656
		657	static void
		658	siginit (EV_P)
		659	{
		660	fd_intern (sigpipe [0]);
		661	fd_intern (sigpipe [1]);
		662
		663	ev_io_set (&sigev, sigpipe [0], EV_READ);
		664	ev_io_start (EV_A_ &sigev);
		665	ev_unref (EV_A); /* child watcher should not keep loop alive */
		666	}
		667
		668	/*****************************************************************************/
		669
		670	static struct ev_child *childs [PID_HASHSIZE];
		671
		672	#ifndef _WIN32
		673
		674	static struct ev_signal childev;
		675
		676	#ifndef WCONTINUED
		677	# define WCONTINUED 0
		678	#endif
		679
		680	static void
		681	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		682	{
		683	struct ev_child *w;
		684
		685	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		686	if (w->pid == pid || !w->pid)
		687	{
		688	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		689	w->rpid = pid;
		690	w->rstatus = status;
		691	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		692	}
		693	}
		694
		695	static void
		696	childcb (EV_P_ struct ev_signal *sw, int revents)
		697	{
		698	int pid, status;
		699
		700	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		701	{
		702	/* make sure we are called again until all childs have been reaped */
		703	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		704
		705	child_reap (EV_A_ sw, pid, pid, status);
		706	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		707	}
		708	}
		709
		710	#endif
		711
		712	/*****************************************************************************/
		713
		714	#if EV_USE_KQUEUE
		715	# include "ev_kqueue.c"
		716	#endif
		717	#if EV_USE_EPOLL
		718	# include "ev_epoll.c"
		719	#endif
		720	#if EV_USE_POLL
		721	# include "ev_poll.c"
		722	#endif
		723	#if EV_USE_SELECT
		724	# include "ev_select.c"
		725	#endif
		726
		727	int
		728	ev_version_major (void)
		729	{
		730	return EV_VERSION_MAJOR;
		731	}
		732
		733	int
		734	ev_version_minor (void)
		735	{
		736	return EV_VERSION_MINOR;
		737	}
		738
		739	/* return true if we are running with elevated privileges and should ignore env variables */
		740	static int
		741	enable_secure (void)
		742	{
		743	#ifdef _WIN32
		744	return 0;
		745	#else
		746	return getuid () != geteuid ()
		747	|| getgid () != getegid ();
		748	#endif
		749	}
		750
		751	unsigned int
		752	ev_method (EV_P)
		753	{
		754	return method;
		755	}
		756
		757	static void
		758	loop_init (EV_P_ unsigned int flags)
		759	{
		760	if (!method)
		761	{
		762	#if EV_USE_MONOTONIC
		763	{
		764	struct timespec ts;
		765	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		766	have_monotonic = 1;
		767	}
		768	#endif
		769
		770	ev_rt_now = ev_time ();
		771	mn_now = get_clock ();
		772	now_floor = mn_now;
		773	rtmn_diff = ev_rt_now - mn_now;
		774
		775	if (!(flags & EVMETHOD_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		776	flags = atoi (getenv ("LIBEV_FLAGS"));
		777
		778	if (!(flags & 0x0000ffff))
		779	flags |= 0x0000ffff;
		780
		781	method = 0;
		782	#if EV_USE_KQUEUE
		783	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		784	#endif
		785	#if EV_USE_EPOLL
		786	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
		787	#endif
		788	#if EV_USE_POLL
		789	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		790	#endif
		791	#if EV_USE_SELECT
		792	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
		793	#endif
		794
		795	ev_init (&sigev, sigcb);
		796	ev_set_priority (&sigev, EV_MAXPRI);
		797	}
		798	}
		799
		800	void
		801	loop_destroy (EV_P)
347	{	802	{
348	int i;	803	int i;
349		804
350	for (i = 0; i < pendingcnt; ++i)	805	#if EV_USE_KQUEUE
		806	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		807	#endif
		808	#if EV_USE_EPOLL
		809	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		810	#endif
		811	#if EV_USE_POLL
		812	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		813	#endif
		814	#if EV_USE_SELECT
		815	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		816	#endif
		817
		818	for (i = NUMPRI; i--; )
		819	array_free (pending, [i]);
		820
		821	/* have to use the microsoft-never-gets-it-right macro */
		822	array_free (fdchange, EMPTY);
		823	array_free (timer, EMPTY);
		824	#if EV_PERIODICS
		825	array_free (periodic, EMPTY);
		826	#endif
		827	array_free (idle, EMPTY);
		828	array_free (prepare, EMPTY);
		829	array_free (check, EMPTY);
		830
		831	method = 0;
		832	}
		833
		834	static void
		835	loop_fork (EV_P)
		836	{
		837	#if EV_USE_EPOLL
		838	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		839	#endif
		840	#if EV_USE_KQUEUE
		841	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		842	#endif
		843
		844	if (ev_is_active (&sigev))
		845	{
		846	/* default loop */
		847
		848	ev_ref (EV_A);
		849	ev_io_stop (EV_A_ &sigev);
		850	close (sigpipe [0]);
		851	close (sigpipe [1]);
		852
		853	while (pipe (sigpipe))
		854	syserr ("(libev) error creating pipe");
		855
		856	siginit (EV_A);
351	{	857	}
352	ANPENDING *p = pendings + i;
353		858
354	if (p->w)	859	postfork = 0;
		860	}
		861
		862	#if EV_MULTIPLICITY
		863	struct ev_loop *
		864	ev_loop_new (unsigned int flags)
		865	{
		866	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		867
		868	memset (loop, 0, sizeof (struct ev_loop));
		869
		870	loop_init (EV_A_ flags);
		871
		872	if (ev_method (EV_A))
		873	return loop;
		874
		875	return 0;
		876	}
		877
		878	void
		879	ev_loop_destroy (EV_P)
		880	{
		881	loop_destroy (EV_A);
		882	ev_free (loop);
		883	}
		884
		885	void
		886	ev_loop_fork (EV_P)
		887	{
		888	postfork = 1;
		889	}
		890
		891	#endif
		892
		893	#if EV_MULTIPLICITY
		894	struct ev_loop *
		895	#else
		896	int
		897	#endif
		898	ev_default_loop (unsigned int flags)
		899	{
		900	if (sigpipe [0] == sigpipe [1])
		901	if (pipe (sigpipe))
		902	return 0;
		903
		904	if (!default_loop)
		905	{
		906	#if EV_MULTIPLICITY
		907	struct ev_loop *loop = default_loop = &default_loop_struct;
		908	#else
		909	default_loop = 1;
		910	#endif
		911
		912	loop_init (EV_A_ flags);
		913
		914	if (ev_method (EV_A))
355	{	915	{
356	p->w->pending = 0;	916	siginit (EV_A);
357	p->w->cb (p->w, p->events);	917
		918	#ifndef _WIN32
		919	ev_signal_init (&childev, childcb, SIGCHLD);
		920	ev_set_priority (&childev, EV_MAXPRI);
		921	ev_signal_start (EV_A_ &childev);
		922	ev_unref (EV_A); /* child watcher should not keep loop alive */
		923	#endif
358	}	924	}
		925	else
		926	default_loop = 0;
		927	}
		928
		929	return default_loop;
		930	}
		931
		932	void
		933	ev_default_destroy (void)
		934	{
		935	#if EV_MULTIPLICITY
		936	struct ev_loop *loop = default_loop;
		937	#endif
		938
		939	#ifndef _WIN32
		940	ev_ref (EV_A); /* child watcher */
		941	ev_signal_stop (EV_A_ &childev);
		942	#endif
		943
		944	ev_ref (EV_A); /* signal watcher */
		945	ev_io_stop (EV_A_ &sigev);
		946
		947	close (sigpipe [0]); sigpipe [0] = 0;
		948	close (sigpipe [1]); sigpipe [1] = 0;
		949
		950	loop_destroy (EV_A);
		951	}
		952
		953	void
		954	ev_default_fork (void)
		955	{
		956	#if EV_MULTIPLICITY
		957	struct ev_loop *loop = default_loop;
		958	#endif
		959
		960	if (method)
		961	postfork = 1;
		962	}
		963
		964	/*****************************************************************************/
		965
		966	static int
		967	any_pending (EV_P)
		968	{
		969	int pri;
		970
		971	for (pri = NUMPRI; pri--; )
		972	if (pendingcnt [pri])
		973	return 1;
		974
		975	return 0;
		976	}
		977
		978	static void
		979	call_pending (EV_P)
		980	{
		981	int pri;
		982
		983	for (pri = NUMPRI; pri--; )
		984	while (pendingcnt [pri])
		985	{
		986	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		987
		988	if (p->w)
		989	{
		990	p->w->pending = 0;
		991	EV_CB_INVOKE (p->w, p->events);
		992	}
359	}	993	}
360
361	pendingcnt = 0;
362	}	994	}
363		995
364	static void	996	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	997	timers_reify (EV_P)
366	{	998	{
367	while (timercnt && timers [0]->at <= now)	999	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	1000	{
369	struct ev_timer *w = timers [0];	1001	struct ev_timer *w = timers [0];
		1002
		1003	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		1004
371	/* first reschedule or stop timer */	1005	/* first reschedule or stop timer */
372	if (w->repeat)	1006	if (w->repeat)
373	{	1007	{
374	if (w->is_abs)	1008	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1009
376	else
377	w->at = now + w->repeat;	1010	((WT)w)->at += w->repeat;
		1011	if (((WT)w)->at < mn_now)
		1012	((WT)w)->at = mn_now;
378		1013
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	1014	downheap ((WT *)timers, timercnt, 0);
382	}	1015	}
383	else	1016	else
		1017	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1018
		1019	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1020	}
		1021	}
		1022
		1023	#if EV_PERIODICS
		1024	static void
		1025	periodics_reify (EV_P)
		1026	{
		1027	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1028	{
		1029	struct ev_periodic *w = periodics [0];
		1030
		1031	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1032
		1033	/* first reschedule or stop timer */
		1034	if (w->reschedule_cb)
384	{	1035	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	1036	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
386	--timercnt; /* maybe pass by reference instead? */	1037	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1038	downheap ((WT *)periodics, periodiccnt, 0);
387	}	1039	}
		1040	else if (w->interval)
		1041	{
		1042	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1043	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1044	downheap ((WT *)periodics, periodiccnt, 0);
		1045	}
		1046	else
		1047	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1048
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1049	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1050	}
391	}	1051	}
392		1052
393	static void	1053	static void
394	time_update ()	1054	periodics_reschedule (EV_P)
395	{	1055	{
396	int i;	1056	int i;
		1057
		1058	/* adjust periodics after time jump */
		1059	for (i = 0; i < periodiccnt; ++i)
		1060	{
		1061	struct ev_periodic *w = periodics [i];
		1062
		1063	if (w->reschedule_cb)
		1064	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1065	else if (w->interval)
		1066	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1067	}
		1068
		1069	/* now rebuild the heap */
		1070	for (i = periodiccnt >> 1; i--; )
		1071	downheap ((WT *)periodics, periodiccnt, i);
		1072	}
		1073	#endif
		1074
		1075	inline int
		1076	time_update_monotonic (EV_P)
		1077	{
		1078	mn_now = get_clock ();
		1079
		1080	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1081	{
		1082	ev_rt_now = rtmn_diff + mn_now;
		1083	return 0;
		1084	}
		1085	else
		1086	{
		1087	now_floor = mn_now;
397	ev_now = ev_time ();	1088	ev_rt_now = ev_time ();
398		1089	return 1;
399	if (have_monotonic)
400	{	1090	}
401	ev_tstamp odiff = diff;	1091	}
402		1092
403	/* detecting time jumps is much more difficult */	1093	static void
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1094	time_update (EV_P)
		1095	{
		1096	int i;
		1097
		1098	#if EV_USE_MONOTONIC
		1099	if (expect_true (have_monotonic))
		1100	{
		1101	if (time_update_monotonic (EV_A))
405	{	1102	{
406	now = get_clock ();	1103	ev_tstamp odiff = rtmn_diff;
		1104
		1105	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1106	{
407	diff = ev_now - now;	1107	rtmn_diff = ev_rt_now - mn_now;
408		1108
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1109	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1110	return; /* all is well */
411		1111
412	ev_now = ev_time ();	1112	ev_rt_now = ev_time ();
		1113	mn_now = get_clock ();
		1114	now_floor = mn_now;
		1115	}
		1116
		1117	# if EV_PERIODICS
		1118	periodics_reschedule (EV_A);
		1119	# endif
		1120	/* no timer adjustment, as the monotonic clock doesn't jump */
		1121	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
413	}	1122	}
		1123	}
		1124	else
		1125	#endif
		1126	{
		1127	ev_rt_now = ev_time ();
414		1128
415	/* time jump detected, reschedule atimers */	1129	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
416	for (i = 0; i < atimercnt; ++i)
417	{	1130	{
418	struct ev_timer *w = atimers [i];	1131	#if EV_PERIODICS
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1132	periodics_reschedule (EV_A);
		1133	#endif
		1134
		1135	/* adjust timers. this is easy, as the offset is the same for all */
		1136	for (i = 0; i < timercnt; ++i)
		1137	((WT)timers [i])->at += ev_rt_now - mn_now;
420	}	1138	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1139
429	now = ev_now;	1140	mn_now = ev_rt_now;
430	}	1141	}
431	}	1142	}
432		1143
433	int ev_loop_done;	1144	void
		1145	ev_ref (EV_P)
		1146	{
		1147	++activecnt;
		1148	}
434		1149
		1150	void
		1151	ev_unref (EV_P)
		1152	{
		1153	--activecnt;
		1154	}
		1155
		1156	static int loop_done;
		1157
		1158	void
435	void ev_loop (int flags)	1159	ev_loop (EV_P_ int flags)
436	{	1160	{
437	double block;	1161	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1162	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		1163
440	do	1164	do
441	{	1165	{
		1166	/* queue check watchers (and execute them) */
		1167	if (expect_false (preparecnt))
		1168	{
		1169	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1170	call_pending (EV_A);
		1171	}
		1172
		1173	/* we might have forked, so reify kernel state if necessary */
		1174	if (expect_false (postfork))
		1175	loop_fork (EV_A);
		1176
442	/* update fd-related kernel structures */	1177	/* update fd-related kernel structures */
443	fd_reify ();	1178	fd_reify (EV_A);
444		1179
445	/* calculate blocking time */	1180	/* calculate blocking time */
		1181
		1182	/* we only need this for !monotonic clock or timers, but as we basically
		1183	always have timers, we just calculate it always */
		1184	#if EV_USE_MONOTONIC
		1185	if (expect_true (have_monotonic))
		1186	time_update_monotonic (EV_A);
		1187	else
		1188	#endif
		1189	{
		1190	ev_rt_now = ev_time ();
		1191	mn_now = ev_rt_now;
		1192	}
		1193
446	if (flags & EVLOOP_NONBLOCK)	1194	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1195	block = 0.;
448	else	1196	else
449	{	1197	{
450	block = MAX_BLOCKTIME;	1198	block = MAX_BLOCKTIME;
451		1199
452	if (rtimercnt)	1200	if (timercnt)
453	{	1201	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1202	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
455	if (block > to) block = to;	1203	if (block > to) block = to;
456	}	1204	}
457		1205
		1206	#if EV_PERIODICS
458	if (atimercnt)	1207	if (periodiccnt)
459	{	1208	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1209	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
461	if (block > to) block = to;	1210	if (block > to) block = to;
462	}	1211	}
		1212	#endif
463		1213
464	if (block < 0.) block = 0.;	1214	if (block < 0.) block = 0.;
465	}	1215	}
466		1216
467	method_poll (block);	1217	method_poll (EV_A_ block);
468		1218
469	/* update ev_now, do magic */	1219	/* update ev_rt_now, do magic */
470	time_update ();	1220	time_update (EV_A);
471		1221
472	/* put pending timers into pendign queue and reschedule them */	1222	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1223	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1224	#if EV_PERIODICS
475	/* relative timers second */	1225	periodics_reify (EV_A); /* absolute timers called first */
476	timers_reify (rtimers, rtimercnt, now);	1226	#endif
477		1227
		1228	/* queue idle watchers unless io or timers are pending */
		1229	if (idlecnt && !any_pending (EV_A))
		1230	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1231
		1232	/* queue check watchers, to be executed first */
		1233	if (checkcnt)
		1234	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1235
478	call_pending ();	1236	call_pending (EV_A);
479	}	1237	}
480	while (!ev_loop_done);	1238	while (activecnt && !loop_done);
481	}
482		1239
483	static void	1240	if (loop_done != 2)
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1241	loop_done = 0;
		1242	}
		1243
		1244	void
		1245	ev_unloop (EV_P_ int how)
		1246	{
		1247	loop_done = how;
		1248	}
		1249
		1250	/*****************************************************************************/
		1251
		1252	inline void
		1253	wlist_add (WL *head, WL elem)
485	{	1254	{
486	elem->next = *head;	1255	elem->next = *head;
487	*head = elem;	1256	*head = elem;
488	}	1257	}
489		1258
490	static void	1259	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1260	wlist_del (WL *head, WL elem)
492	{	1261	{
493	while (*head)	1262	while (*head)
494	{	1263	{
495	if (*head == elem)	1264	if (*head == elem)
496	{	1265	{
…		…
500		1269
501	head = &(*head)->next;	1270	head = &(*head)->next;
502	}	1271	}
503	}	1272	}
504		1273
505	static void	1274	inline void
506	ev_start (struct ev_watcher *w, int active)	1275	ev_clear_pending (EV_P_ W w)
507	{	1276	{
		1277	if (w->pending)
		1278	{
		1279	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1280	w->pending = 0;
		1281	}
		1282	}
		1283
		1284	inline void
		1285	ev_start (EV_P_ W w, int active)
		1286	{
		1287	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1288	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1289
509	w->active = active;	1290	w->active = active;
		1291	ev_ref (EV_A);
510	}	1292	}
511		1293
512	static void	1294	inline void
513	ev_stop (struct ev_watcher *w)	1295	ev_stop (EV_P_ W w)
514	{	1296	{
515	if (w->pending)	1297	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1298	w->active = 0;
519	/* nop */
520	}	1299	}
521		1300
		1301	/*****************************************************************************/
		1302
522	void	1303	void
523	evio_start (struct ev_io *w)	1304	ev_io_start (EV_P_ struct ev_io *w)
524	{	1305	{
		1306	int fd = w->fd;
		1307
525	if (ev_is_active (w))	1308	if (ev_is_active (w))
526	return;	1309	return;
527		1310
528	int fd = w->fd;	1311	assert (("ev_io_start called with negative fd", fd >= 0));
529		1312
530	ev_start ((struct ev_watcher *)w, 1);	1313	ev_start (EV_A_ (W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1314	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1315	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		1316
534	++fdchangecnt;	1317	fd_change (EV_A_ fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	1318	}
538		1319
539	void	1320	void
540	evio_stop (struct ev_io *w)	1321	ev_io_stop (EV_P_ struct ev_io *w)
541	{	1322	{
		1323	ev_clear_pending (EV_A_ (W)w);
542	if (!ev_is_active (w))	1324	if (!ev_is_active (w))
543	return;	1325	return;
544		1326
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1327	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
546	ev_stop ((struct ev_watcher *)w);
547		1328
548	++fdchangecnt;	1329	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1330	ev_stop (EV_A_ (W)w);
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}
552		1331
		1332	fd_change (EV_A_ w->fd);
		1333	}
		1334
553	void	1335	void
554	evtimer_start (struct ev_timer *w)	1336	ev_timer_start (EV_P_ struct ev_timer *w)
555	{	1337	{
556	if (ev_is_active (w))	1338	if (ev_is_active (w))
557	return;	1339	return;
558		1340
559	if (w->is_abs)	1341	((WT)w)->at += mn_now;
		1342
		1343	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1344
		1345	ev_start (EV_A_ (W)w, ++timercnt);
		1346	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1347	timers [timercnt - 1] = w;
		1348	upheap ((WT *)timers, timercnt - 1);
		1349
		1350	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1351	}
		1352
		1353	void
		1354	ev_timer_stop (EV_P_ struct ev_timer *w)
		1355	{
		1356	ev_clear_pending (EV_A_ (W)w);
		1357	if (!ev_is_active (w))
		1358	return;
		1359
		1360	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1361
		1362	if (((W)w)->active < timercnt--)
		1363	{
		1364	timers [((W)w)->active - 1] = timers [timercnt];
		1365	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
560	{	1366	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	1367
		1368	((WT)w)->at -= mn_now;
		1369
		1370	ev_stop (EV_A_ (W)w);
		1371	}
		1372
		1373	void
		1374	ev_timer_again (EV_P_ struct ev_timer *w)
		1375	{
		1376	if (ev_is_active (w))
		1377	{
562	if (w->repeat)	1378	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1379	{
564		1380	((WT)w)->at = mn_now + w->repeat;
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1381	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
566	array_needsize (atimers, atimermax, atimercnt, );	1382	}
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else	1383	else
		1384	ev_timer_stop (EV_A_ w);
571	{	1385	}
572	w->at += now;	1386	else if (w->repeat)
		1387	ev_timer_start (EV_A_ w);
		1388	}
573		1389
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1390	#if EV_PERIODICS
575	array_needsize (rtimers, rtimermax, rtimercnt, );	1391	void
576	rtimers [rtimercnt - 1] = w;	1392	ev_periodic_start (EV_P_ struct ev_periodic *w)
577	upheap (rtimers, rtimercnt - 1);	1393	{
		1394	if (ev_is_active (w))
		1395	return;
		1396
		1397	if (w->reschedule_cb)
		1398	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1399	else if (w->interval)
578	}	1400	{
		1401	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1402	/* this formula differs from the one in periodic_reify because we do not always round up */
		1403	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1404	}
579		1405
580	}	1406	ev_start (EV_A_ (W)w, ++periodiccnt);
		1407	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1408	periodics [periodiccnt - 1] = w;
		1409	upheap ((WT *)periodics, periodiccnt - 1);
581		1410
		1411	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1412	}
		1413
582	void	1414	void
583	evtimer_stop (struct ev_timer *w)	1415	ev_periodic_stop (EV_P_ struct ev_periodic *w)
584	{	1416	{
		1417	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1418	if (!ev_is_active (w))
586	return;	1419	return;
587		1420
588	if (w->is_abs)	1421	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
589	{	1422
590	if (w->active < atimercnt--)	1423	if (((W)w)->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	1424	{
596	else	1425	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1426	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
597	{	1427	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1428
605	ev_stop ((struct ev_watcher *)w);	1429	ev_stop (EV_A_ (W)w);
606	}	1430	}
607		1431
608	void	1432	void
609	evsignal_start (struct ev_signal *w)	1433	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1434	{
		1435	/* TODO: use adjustheap and recalculation */
		1436	ev_periodic_stop (EV_A_ w);
		1437	ev_periodic_start (EV_A_ w);
		1438	}
		1439	#endif
		1440
		1441	void
		1442	ev_idle_start (EV_P_ struct ev_idle *w)
610	{	1443	{
611	if (ev_is_active (w))	1444	if (ev_is_active (w))
612	return;	1445	return;
613		1446
614	ev_start ((struct ev_watcher *)w, 1);	1447	ev_start (EV_A_ (W)w, ++idlecnt);
		1448	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1449	idles [idlecnt - 1] = w;
		1450	}
		1451
		1452	void
		1453	ev_idle_stop (EV_P_ struct ev_idle *w)
		1454	{
		1455	ev_clear_pending (EV_A_ (W)w);
		1456	if (!ev_is_active (w))
		1457	return;
		1458
		1459	idles [((W)w)->active - 1] = idles [--idlecnt];
		1460	ev_stop (EV_A_ (W)w);
		1461	}
		1462
		1463	void
		1464	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1465	{
		1466	if (ev_is_active (w))
		1467	return;
		1468
		1469	ev_start (EV_A_ (W)w, ++preparecnt);
		1470	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1471	prepares [preparecnt - 1] = w;
		1472	}
		1473
		1474	void
		1475	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1476	{
		1477	ev_clear_pending (EV_A_ (W)w);
		1478	if (!ev_is_active (w))
		1479	return;
		1480
		1481	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1482	ev_stop (EV_A_ (W)w);
		1483	}
		1484
		1485	void
		1486	ev_check_start (EV_P_ struct ev_check *w)
		1487	{
		1488	if (ev_is_active (w))
		1489	return;
		1490
		1491	ev_start (EV_A_ (W)w, ++checkcnt);
		1492	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1493	checks [checkcnt - 1] = w;
		1494	}
		1495
		1496	void
		1497	ev_check_stop (EV_P_ struct ev_check *w)
		1498	{
		1499	ev_clear_pending (EV_A_ (W)w);
		1500	if (!ev_is_active (w))
		1501	return;
		1502
		1503	checks [((W)w)->active - 1] = checks [--checkcnt];
		1504	ev_stop (EV_A_ (W)w);
		1505	}
		1506
		1507	#ifndef SA_RESTART
		1508	# define SA_RESTART 0
		1509	#endif
		1510
		1511	void
		1512	ev_signal_start (EV_P_ struct ev_signal *w)
		1513	{
		1514	#if EV_MULTIPLICITY
		1515	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1516	#endif
		1517	if (ev_is_active (w))
		1518	return;
		1519
		1520	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1521
		1522	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1523	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1524	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1525
618	if (!w->next)	1526	if (!((WL)w)->next)
619	{	1527	{
		1528	#if _WIN32
		1529	signal (w->signum, sighandler);
		1530	#else
620	struct sigaction sa;	1531	struct sigaction sa;
621	sa.sa_handler = sighandler;	1532	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1533	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1534	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1535	sigaction (w->signum, &sa, 0);
		1536	#endif
625	}	1537	}
626	}	1538	}
627		1539
628	void	1540	void
629	evsignal_stop (struct ev_signal *w)	1541	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1542	{
		1543	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1544	if (!ev_is_active (w))
632	return;	1545	return;
633		1546
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1547	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1548	ev_stop (EV_A_ (W)w);
636		1549
637	if (!signals [w->signum - 1].head)	1550	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1551	signal (w->signum, SIG_DFL);
639	}	1552	}
640		1553
		1554	void
		1555	ev_child_start (EV_P_ struct ev_child *w)
		1556	{
		1557	#if EV_MULTIPLICITY
		1558	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1559	#endif
		1560	if (ev_is_active (w))
		1561	return;
		1562
		1563	ev_start (EV_A_ (W)w, 1);
		1564	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1565	}
		1566
		1567	void
		1568	ev_child_stop (EV_P_ struct ev_child *w)
		1569	{
		1570	ev_clear_pending (EV_A_ (W)w);
		1571	if (!ev_is_active (w))
		1572	return;
		1573
		1574	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1575	ev_stop (EV_A_ (W)w);
		1576	}
		1577
641	/*****************************************************************************/	1578	/*****************************************************************************/
642	#if 1
643		1579
644	static void	1580	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1581	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648	}
649
650	static void
651	ocb (struct ev_timer *w, int revents)
652	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}
657
658	static void
659	scb (struct ev_signal *w, int revents)
660	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662	}
663
664	int main (void)
665	{
666	struct ev_io sin;	1582	struct ev_io io;
667
668	ev_init (0);
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}
687	#endif
688
689	struct ev_timer t1;	1583	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1584	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1585	void *arg;
692	evtimer_start (&t1);	1586	};
693		1587
694	struct ev_signal sig;	1588	static void
695	evw_init (&sig, scb, 65535);	1589	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1590	{
697	evsignal_start (&sig);	1591	void (*cb)(int revents, void *arg) = once->cb;
		1592	void *arg = once->arg;
698		1593
699	ev_loop (0);	1594	ev_io_stop (EV_A_ &once->io);
		1595	ev_timer_stop (EV_A_ &once->to);
		1596	ev_free (once);
700		1597
701	return 0;	1598	cb (revents, arg);
702	}	1599	}
703		1600
704	#endif	1601	static void
		1602	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1603	{
		1604	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1605	}
705		1606
		1607	static void
		1608	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1609	{
		1610	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1611	}
706		1612
		1613	void
		1614	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1615	{
		1616	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
707		1617
		1618	if (!once)
		1619	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1620	else
		1621	{
		1622	once->cb = cb;
		1623	once->arg = arg;
708		1624
		1625	ev_init (&once->io, once_cb_io);
		1626	if (fd >= 0)
		1627	{
		1628	ev_io_set (&once->io, fd, events);
		1629	ev_io_start (EV_A_ &once->io);
		1630	}
		1631
		1632	ev_init (&once->to, once_cb_to);
		1633	if (timeout >= 0.)
		1634	{
		1635	ev_timer_set (&once->to, timeout, 0.);
		1636	ev_timer_start (EV_A_ &once->to);
		1637	}
		1638	}
		1639	}
		1640
		1641	#ifdef __cplusplus
		1642	}
		1643	#endif
		1644

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