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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.120 by root, Fri Nov 16 01:54:25 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	# if HAVE_PORT_H && HAVE_PORT_CREATE && !defined (EV_USE_PORT)
		65	# define EV_USE_PORT 1
		66	# endif
		67
		68	#endif
		69
1	#include <math.h>	70	#include <math.h>
2	#include <stdlib.h>	71	#include <stdlib.h>
		72	#include <fcntl.h>
		73	#include <stddef.h>
3		74
4	#include <stdio.h>	75	#include <stdio.h>
5		76
6	#include <assert.h>	77	#include <assert.h>
7	#include <errno.h>	78	#include <errno.h>
8	#include <sys/time.h>	79	#include <sys/types.h>
9	#include <time.h>	80	#include <time.h>
10		81
		82	#include <signal.h>
		83
		84	#ifndef _WIN32
		85	# include <unistd.h>
		86	# include <sys/time.h>
		87	# include <sys/wait.h>
		88	#else
		89	# define WIN32_LEAN_AND_MEAN
		90	# include <windows.h>
		91	# ifndef EV_SELECT_IS_WINSOCKET
		92	# define EV_SELECT_IS_WINSOCKET 1
		93	# endif
		94	#endif
		95
		96	/**/
		97
		98	#ifndef EV_USE_MONOTONIC
		99	# define EV_USE_MONOTONIC 1
		100	#endif
		101
		102	#ifndef EV_USE_REALTIME
		103	# define EV_USE_REALTIME 1
		104	#endif
		105
		106	#ifndef EV_USE_SELECT
		107	# define EV_USE_SELECT 1
		108	# define EV_SELECT_USE_FD_SET 1
		109	#endif
		110
		111	#ifndef EV_USE_POLL
		112	# ifdef _WIN32
		113	# define EV_USE_POLL 0
		114	# else
		115	# define EV_USE_POLL 1
		116	# endif
		117	#endif
		118
		119	#ifndef EV_USE_EPOLL
		120	# define EV_USE_EPOLL 0
		121	#endif
		122
		123	#ifndef EV_USE_KQUEUE
		124	# define EV_USE_KQUEUE 0
		125	#endif
		126
		127	#ifndef EV_USE_PORT
		128	# define EV_USE_PORT 0
		129	#endif
		130
		131	/**/
		132
		133	/* darwin simply cannot be helped */
		134	#ifdef __APPLE__
		135	# undef EV_USE_POLL
		136	# undef EV_USE_KQUEUE
		137	#endif
		138
11	#ifdef CLOCK_MONOTONIC	139	#ifndef CLOCK_MONOTONIC
		140	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	141	# define EV_USE_MONOTONIC 0
13	#endif	142	#endif
14		143
15	#define HAVE_EPOLL 1	144	#ifndef CLOCK_REALTIME
		145	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	146	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 1	147	#endif
		148
		149	#if EV_SELECT_IS_WINSOCKET
		150	# include <winsock.h>
		151	#endif
		152
		153	/**/
18		154
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	155	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	156	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		157	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		158	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		159
		160	#ifdef EV_H
		161	# include EV_H
		162	#else
22	#include "ev.h"	163	# include "ev.h"
		164	#endif
23		165
		166	#if __GNUC__ >= 3
		167	# define expect(expr,value) __builtin_expect ((expr),(value))
		168	# define inline inline
		169	#else
		170	# define expect(expr,value) (expr)
		171	# define inline static
		172	#endif
		173
		174	#define expect_false(expr) expect ((expr) != 0, 0)
		175	#define expect_true(expr) expect ((expr) != 0, 1)
		176
		177	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		178	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		179
		180	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		181	#define EMPTY2(a,b) /* used to suppress some warnings */
		182
24	struct ev_watcher {	183	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	184	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	185	typedef struct ev_watcher_time *WT;
30	};
31		186
32	static ev_tstamp now, diff; /* monotonic clock */	187	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		188
		189	#ifdef _WIN32
		190	# include "ev_win32.c"
		191	#endif
		192
		193	/*****************************************************************************/
		194
		195	static void (*syserr_cb)(const char *msg);
		196
		197	void ev_set_syserr_cb (void (*cb)(const char *msg))
		198	{
		199	syserr_cb = cb;
		200	}
		201
		202	static void
		203	syserr (const char *msg)
		204	{
		205	if (!msg)
		206	msg = "(libev) system error";
		207
		208	if (syserr_cb)
		209	syserr_cb (msg);
		210	else
		211	{
		212	perror (msg);
		213	abort ();
		214	}
		215	}
		216
		217	static void *(*alloc)(void *ptr, long size);
		218
		219	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		220	{
		221	alloc = cb;
		222	}
		223
		224	static void *
		225	ev_realloc (void *ptr, long size)
		226	{
		227	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		228
		229	if (!ptr && size)
		230	{
		231	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		232	abort ();
		233	}
		234
		235	return ptr;
		236	}
		237
		238	#define ev_malloc(size) ev_realloc (0, (size))
		239	#define ev_free(ptr) ev_realloc ((ptr), 0)
		240
		241	/*****************************************************************************/
		242
		243	typedef struct
		244	{
		245	WL head;
		246	unsigned char events;
		247	unsigned char reify;
		248	#if EV_SELECT_IS_WINSOCKET
		249	SOCKET handle;
		250	#endif
		251	} ANFD;
		252
		253	typedef struct
		254	{
		255	W w;
		256	int events;
		257	} ANPENDING;
		258
		259	#if EV_MULTIPLICITY
		260
		261	struct ev_loop
		262	{
		263	ev_tstamp ev_rt_now;
		264	#define ev_rt_now ((loop)->ev_rt_now)
		265	#define VAR(name,decl) decl;
		266	#include "ev_vars.h"
		267	#undef VAR
		268	};
		269	#include "ev_wrap.h"
		270
		271	static struct ev_loop default_loop_struct;
		272	struct ev_loop *ev_default_loop_ptr;
		273
		274	#else
		275
33	ev_tstamp ev_now;	276	ev_tstamp ev_rt_now;
34	int ev_method;	277	#define VAR(name,decl) static decl;
		278	#include "ev_vars.h"
		279	#undef VAR
35		280
36	static int have_monotonic; /* runtime */	281	static int ev_default_loop_ptr;
37		282
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	283	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	284
40	static void (*method_poll)(ev_tstamp timeout);	285	/*****************************************************************************/
41		286
42	ev_tstamp	287	ev_tstamp
43	ev_time (void)	288	ev_time (void)
44	{	289	{
45	#if HAVE_REALTIME	290	#if EV_USE_REALTIME
46	struct timespec ts;	291	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	292	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	293	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	294	#else
50	struct timeval tv;	295	struct timeval tv;
51	gettimeofday (&tv, 0);	296	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	297	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	298	#endif
54	}	299	}
55		300
56	static ev_tstamp	301	inline ev_tstamp
57	get_clock (void)	302	get_clock (void)
58	{	303	{
59	#if HAVE_MONOTONIC	304	#if EV_USE_MONOTONIC
60	if (have_monotonic)	305	if (expect_true (have_monotonic))
61	{	306	{
62	struct timespec ts;	307	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	308	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	309	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	310	}
66	#endif	311	#endif
67		312
68	return ev_time ();	313	return ev_time ();
69	}	314	}
70		315
		316	#if EV_MULTIPLICITY
		317	ev_tstamp
		318	ev_now (EV_P)
		319	{
		320	return ev_rt_now;
		321	}
		322	#endif
		323
		324	#define array_roundsize(type,n) (((n) | 4) & ~3)
		325
71	#define array_needsize(base,cur,cnt,init) \	326	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	327	if (expect_false ((cnt) > cur)) \
73	{ \	328	{ \
74	int newcnt = cur ? cur << 1 : 16; \	329	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	330	do \
		331	{ \
		332	newcnt = array_roundsize (type, newcnt << 1); \
		333	} \
		334	while ((cnt) > newcnt); \
		335	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	336	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	337	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	338	cur = newcnt; \
79	}	339	}
80		340
81	typedef struct	341	#define array_slim(type,stem) \
82	{	342	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	343	{ \
84	unsigned char wev, rev; /* want, received event set */	344	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	345	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		346	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		347	}
86		348
87	static ANFD *anfds;	349	#define array_free(stem, idx) \
88	static int anfdmax;	350	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		351
90	static int *fdchanges;	352	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		353
93	static void	354	static void
94	anfds_init (ANFD *base, int count)	355	anfds_init (ANFD *base, int count)
95	{	356	{
96	while (count--)	357	while (count--)
97	{	358	{
98	base->head = 0;	359	base->head = 0;
99	base->wev = base->rev = EV_NONE;	360	base->events = EV_NONE;
		361	base->reify = 0;
		362
100	++base;	363	++base;
101	}	364	}
102	}	365	}
103		366
104	typedef struct	367	void
		368	ev_feed_event (EV_P_ void *w, int revents)
105	{	369	{
106	struct ev_watcher *w;	370	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		371
110	static ANPENDING *pendings;	372	if (w_->pending)
111	static int pendingmax, pendingcnt;	373	{
		374	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		375	return;
		376	}
112		377
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	378	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	379	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
118	pendings [pendingcnt - 1].w = w;	380	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	381	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	382	}
121		383
122	static void	384	static void
		385	queue_events (EV_P_ W *events, int eventcnt, int type)
		386	{
		387	int i;
		388
		389	for (i = 0; i < eventcnt; ++i)
		390	ev_feed_event (EV_A_ events [i], type);
		391	}
		392
		393	inline void
123	fd_event (int fd, int events)	394	fd_event (EV_P_ int fd, int revents)
124	{	395	{
125	ANFD *anfd = anfds + fd;	396	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	397	struct ev_io *w;
127		398
128	for (w = anfd->head; w; w = w->next)	399	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	400	{
130	int ev = w->events & events;	401	int ev = w->events & revents;
131		402
132	if (ev)	403	if (ev)
133	event ((struct ev_watcher *)w, ev);	404	ev_feed_event (EV_A_ (W)w, ev);
134	}
135	}
136
137	static struct ev_timer **atimers;
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{	405	}
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	406	}
159		407
160	static void	408	void
161	downheap (struct ev_timer **timers, int N, int k)	409	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	410	{
163	struct ev_timer *w = timers [k];	411	fd_event (EV_A_ fd, revents);
164
165	while (k < (N >> 1))
166	{
167	int j = k << 1;
168
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	++j;
171
172	if (w->at <= timers [j]->at)
173	break;
174
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}	412	}
183		413
184	static struct ev_signal **signals;	414	/*****************************************************************************/
185	static int signalmax;
186		415
187	static void	416	static void
188	signals_init (struct ev_signal **base, int count)	417	fd_reify (EV_P)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL
195	# include "ev_epoll.c"
196	#endif
197	#if HAVE_SELECT
198	# include "ev_select.c"
199	#endif
200
201	int ev_init (int flags)
202	{
203	#if HAVE_MONOTONIC
204	{
205	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;
208	}
209	#endif
210
211	ev_now = ev_time ();
212	now = get_clock ();
213	diff = ev_now - now;
214
215	#if HAVE_EPOLL
216	if (epoll_init (flags))
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();
241	#endif
242	}
243
244	static void
245	fd_reify (void)
246	{	418	{
247	int i;	419	int i;
248		420
249	for (i = 0; i < fdchangecnt; ++i)	421	for (i = 0; i < fdchangecnt; ++i)
250	{	422	{
251	int fd = fdchanges [i];	423	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	424	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	425	struct ev_io *w;
254		426
255	int wev = 0;	427	int events = 0;
256		428
257	for (w = anfd->head; w; w = w->next)	429	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	430	events |= w->events;
259		431
260	if (anfd->wev != wev)	432	#if EV_SELECT_IS_WINSOCKET
		433	if (events)
261	{	434	{
262	method_modify (fd, anfd->wev, wev);	435	unsigned long argp;
263	anfd->wev = wev;	436	anfd->handle = _get_osfhandle (fd);
		437	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	438	}
		439	#endif
		440
		441	anfd->reify = 0;
		442
		443	method_modify (EV_A_ fd, anfd->events, events);
		444	anfd->events = events;
265	}	445	}
266		446
267	fdchangecnt = 0;	447	fdchangecnt = 0;
268	}	448	}
269		449
270	static void	450	static void
271	call_pending ()	451	fd_change (EV_P_ int fd)
		452	{
		453	if (anfds [fd].reify)
		454	return;
		455
		456	anfds [fd].reify = 1;
		457
		458	++fdchangecnt;
		459	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		460	fdchanges [fdchangecnt - 1] = fd;
		461	}
		462
		463	static void
		464	fd_kill (EV_P_ int fd)
		465	{
		466	struct ev_io *w;
		467
		468	while ((w = (struct ev_io *)anfds [fd].head))
		469	{
		470	ev_io_stop (EV_A_ w);
		471	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		472	}
		473	}
		474
		475	static int
		476	fd_valid (int fd)
		477	{
		478	#ifdef _WIN32
		479	return _get_osfhandle (fd) != -1;
		480	#else
		481	return fcntl (fd, F_GETFD) != -1;
		482	#endif
		483	}
		484
		485	/* called on EBADF to verify fds */
		486	static void
		487	fd_ebadf (EV_P)
		488	{
		489	int fd;
		490
		491	for (fd = 0; fd < anfdmax; ++fd)
		492	if (anfds [fd].events)
		493	if (!fd_valid (fd) == -1 && errno == EBADF)
		494	fd_kill (EV_A_ fd);
		495	}
		496
		497	/* called on ENOMEM in select/poll to kill some fds and retry */
		498	static void
		499	fd_enomem (EV_P)
		500	{
		501	int fd;
		502
		503	for (fd = anfdmax; fd--; )
		504	if (anfds [fd].events)
		505	{
		506	fd_kill (EV_A_ fd);
		507	return;
		508	}
		509	}
		510
		511	/* usually called after fork if method needs to re-arm all fds from scratch */
		512	static void
		513	fd_rearm_all (EV_P)
		514	{
		515	int fd;
		516
		517	/* this should be highly optimised to not do anything but set a flag */
		518	for (fd = 0; fd < anfdmax; ++fd)
		519	if (anfds [fd].events)
		520	{
		521	anfds [fd].events = 0;
		522	fd_change (EV_A_ fd);
		523	}
		524	}
		525
		526	/*****************************************************************************/
		527
		528	static void
		529	upheap (WT *heap, int k)
		530	{
		531	WT w = heap [k];
		532
		533	while (k && heap [k >> 1]->at > w->at)
		534	{
		535	heap [k] = heap [k >> 1];
		536	((W)heap [k])->active = k + 1;
		537	k >>= 1;
		538	}
		539
		540	heap [k] = w;
		541	((W)heap [k])->active = k + 1;
		542
		543	}
		544
		545	static void
		546	downheap (WT *heap, int N, int k)
		547	{
		548	WT w = heap [k];
		549
		550	while (k < (N >> 1))
		551	{
		552	int j = k << 1;
		553
		554	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		555	++j;
		556
		557	if (w->at <= heap [j]->at)
		558	break;
		559
		560	heap [k] = heap [j];
		561	((W)heap [k])->active = k + 1;
		562	k = j;
		563	}
		564
		565	heap [k] = w;
		566	((W)heap [k])->active = k + 1;
		567	}
		568
		569	inline void
		570	adjustheap (WT *heap, int N, int k)
		571	{
		572	upheap (heap, k);
		573	downheap (heap, N, k);
		574	}
		575
		576	/*****************************************************************************/
		577
		578	typedef struct
		579	{
		580	WL head;
		581	sig_atomic_t volatile gotsig;
		582	} ANSIG;
		583
		584	static ANSIG *signals;
		585	static int signalmax;
		586
		587	static int sigpipe [2];
		588	static sig_atomic_t volatile gotsig;
		589	static struct ev_io sigev;
		590
		591	static void
		592	signals_init (ANSIG *base, int count)
		593	{
		594	while (count--)
		595	{
		596	base->head = 0;
		597	base->gotsig = 0;
		598
		599	++base;
		600	}
		601	}
		602
		603	static void
		604	sighandler (int signum)
		605	{
		606	#if _WIN32
		607	signal (signum, sighandler);
		608	#endif
		609
		610	signals [signum - 1].gotsig = 1;
		611
		612	if (!gotsig)
		613	{
		614	int old_errno = errno;
		615	gotsig = 1;
		616	write (sigpipe [1], &signum, 1);
		617	errno = old_errno;
		618	}
		619	}
		620
		621	void
		622	ev_feed_signal_event (EV_P_ int signum)
		623	{
		624	WL w;
		625
		626	#if EV_MULTIPLICITY
		627	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		628	#endif
		629
		630	--signum;
		631
		632	if (signum < 0 || signum >= signalmax)
		633	return;
		634
		635	signals [signum].gotsig = 0;
		636
		637	for (w = signals [signum].head; w; w = w->next)
		638	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		639	}
		640
		641	static void
		642	sigcb (EV_P_ struct ev_io *iow, int revents)
		643	{
		644	int signum;
		645
		646	read (sigpipe [0], &revents, 1);
		647	gotsig = 0;
		648
		649	for (signum = signalmax; signum--; )
		650	if (signals [signum].gotsig)
		651	ev_feed_signal_event (EV_A_ signum + 1);
		652	}
		653
		654	inline void
		655	fd_intern (int fd)
		656	{
		657	#ifdef _WIN32
		658	int arg = 1;
		659	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		660	#else
		661	fcntl (fd, F_SETFD, FD_CLOEXEC);
		662	fcntl (fd, F_SETFL, O_NONBLOCK);
		663	#endif
		664	}
		665
		666	static void
		667	siginit (EV_P)
		668	{
		669	fd_intern (sigpipe [0]);
		670	fd_intern (sigpipe [1]);
		671
		672	ev_io_set (&sigev, sigpipe [0], EV_READ);
		673	ev_io_start (EV_A_ &sigev);
		674	ev_unref (EV_A); /* child watcher should not keep loop alive */
		675	}
		676
		677	/*****************************************************************************/
		678
		679	static struct ev_child *childs [PID_HASHSIZE];
		680
		681	#ifndef _WIN32
		682
		683	static struct ev_signal childev;
		684
		685	#ifndef WCONTINUED
		686	# define WCONTINUED 0
		687	#endif
		688
		689	static void
		690	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		691	{
		692	struct ev_child *w;
		693
		694	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		695	if (w->pid == pid || !w->pid)
		696	{
		697	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		698	w->rpid = pid;
		699	w->rstatus = status;
		700	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		701	}
		702	}
		703
		704	static void
		705	childcb (EV_P_ struct ev_signal *sw, int revents)
		706	{
		707	int pid, status;
		708
		709	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		710	{
		711	/* make sure we are called again until all childs have been reaped */
		712	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		713
		714	child_reap (EV_A_ sw, pid, pid, status);
		715	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		716	}
		717	}
		718
		719	#endif
		720
		721	/*****************************************************************************/
		722
		723	#if EV_USE_PORT
		724	# include "ev_port.c"
		725	#endif
		726	#if EV_USE_KQUEUE
		727	# include "ev_kqueue.c"
		728	#endif
		729	#if EV_USE_EPOLL
		730	# include "ev_epoll.c"
		731	#endif
		732	#if EV_USE_POLL
		733	# include "ev_poll.c"
		734	#endif
		735	#if EV_USE_SELECT
		736	# include "ev_select.c"
		737	#endif
		738
		739	int
		740	ev_version_major (void)
		741	{
		742	return EV_VERSION_MAJOR;
		743	}
		744
		745	int
		746	ev_version_minor (void)
		747	{
		748	return EV_VERSION_MINOR;
		749	}
		750
		751	/* return true if we are running with elevated privileges and should ignore env variables */
		752	static int
		753	enable_secure (void)
		754	{
		755	#ifdef _WIN32
		756	return 0;
		757	#else
		758	return getuid () != geteuid ()
		759	|| getgid () != getegid ();
		760	#endif
		761	}
		762
		763	unsigned int
		764	ev_method (EV_P)
		765	{
		766	return method;
		767	}
		768
		769	static void
		770	loop_init (EV_P_ unsigned int flags)
		771	{
		772	if (!method)
		773	{
		774	#if EV_USE_MONOTONIC
		775	{
		776	struct timespec ts;
		777	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		778	have_monotonic = 1;
		779	}
		780	#endif
		781
		782	ev_rt_now = ev_time ();
		783	mn_now = get_clock ();
		784	now_floor = mn_now;
		785	rtmn_diff = ev_rt_now - mn_now;
		786
		787	if (!(flags & EVFLAG_NOENV) && !enable_secure () && getenv ("LIBEV_FLAGS"))
		788	flags = atoi (getenv ("LIBEV_FLAGS"));
		789
		790	if (!(flags & 0x0000ffff))
		791	flags |= 0x0000ffff;
		792
		793	method = 0;
		794	#if EV_USE_PORT
		795	if (!method && (flags & EVMETHOD_PORT )) method = port_init (EV_A_ flags);
		796	#endif
		797	#if EV_USE_KQUEUE
		798	if (!method && (flags & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ flags);
		799	#endif
		800	#if EV_USE_EPOLL
		801	if (!method && (flags & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ flags);
		802	#endif
		803	#if EV_USE_POLL
		804	if (!method && (flags & EVMETHOD_POLL )) method = poll_init (EV_A_ flags);
		805	#endif
		806	#if EV_USE_SELECT
		807	if (!method && (flags & EVMETHOD_SELECT)) method = select_init (EV_A_ flags);
		808	#endif
		809
		810	ev_init (&sigev, sigcb);
		811	ev_set_priority (&sigev, EV_MAXPRI);
		812	}
		813	}
		814
		815	void
		816	loop_destroy (EV_P)
272	{	817	{
273	int i;	818	int i;
274		819
275	for (i = 0; i < pendingcnt; ++i)	820	#if EV_USE_PORT
		821	if (method == EVMETHOD_PORT ) port_destroy (EV_A);
		822	#endif
		823	#if EV_USE_KQUEUE
		824	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		825	#endif
		826	#if EV_USE_EPOLL
		827	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		828	#endif
		829	#if EV_USE_POLL
		830	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		831	#endif
		832	#if EV_USE_SELECT
		833	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		834	#endif
		835
		836	for (i = NUMPRI; i--; )
		837	array_free (pending, [i]);
		838
		839	/* have to use the microsoft-never-gets-it-right macro */
		840	array_free (fdchange, EMPTY0);
		841	array_free (timer, EMPTY0);
		842	#if EV_PERIODICS
		843	array_free (periodic, EMPTY0);
		844	#endif
		845	array_free (idle, EMPTY0);
		846	array_free (prepare, EMPTY0);
		847	array_free (check, EMPTY0);
		848
		849	method = 0;
		850	}
		851
		852	static void
		853	loop_fork (EV_P)
		854	{
		855	#if EV_USE_PORT
		856	if (method == EVMETHOD_PORT ) port_fork (EV_A);
		857	#endif
		858	#if EV_USE_KQUEUE
		859	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		860	#endif
		861	#if EV_USE_EPOLL
		862	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		863	#endif
		864
		865	if (ev_is_active (&sigev))
		866	{
		867	/* default loop */
		868
		869	ev_ref (EV_A);
		870	ev_io_stop (EV_A_ &sigev);
		871	close (sigpipe [0]);
		872	close (sigpipe [1]);
		873
		874	while (pipe (sigpipe))
		875	syserr ("(libev) error creating pipe");
		876
		877	siginit (EV_A);
276	{	878	}
277	ANPENDING *p = pendings + i;
278		879
279	if (p->w)	880	postfork = 0;
		881	}
		882
		883	#if EV_MULTIPLICITY
		884	struct ev_loop *
		885	ev_loop_new (unsigned int flags)
		886	{
		887	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		888
		889	memset (loop, 0, sizeof (struct ev_loop));
		890
		891	loop_init (EV_A_ flags);
		892
		893	if (ev_method (EV_A))
		894	return loop;
		895
		896	return 0;
		897	}
		898
		899	void
		900	ev_loop_destroy (EV_P)
		901	{
		902	loop_destroy (EV_A);
		903	ev_free (loop);
		904	}
		905
		906	void
		907	ev_loop_fork (EV_P)
		908	{
		909	postfork = 1;
		910	}
		911
		912	#endif
		913
		914	#if EV_MULTIPLICITY
		915	struct ev_loop *
		916	ev_default_loop_ (unsigned int flags)
		917	#else
		918	int
		919	ev_default_loop (unsigned int flags)
		920	#endif
		921	{
		922	if (sigpipe [0] == sigpipe [1])
		923	if (pipe (sigpipe))
		924	return 0;
		925
		926	if (!ev_default_loop_ptr)
		927	{
		928	#if EV_MULTIPLICITY
		929	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		930	#else
		931	ev_default_loop_ptr = 1;
		932	#endif
		933
		934	loop_init (EV_A_ flags);
		935
		936	if (ev_method (EV_A))
280	{	937	{
281	p->w->pending = 0;	938	siginit (EV_A);
282	p->w->cb (p->w, p->events);	939
		940	#ifndef _WIN32
		941	ev_signal_init (&childev, childcb, SIGCHLD);
		942	ev_set_priority (&childev, EV_MAXPRI);
		943	ev_signal_start (EV_A_ &childev);
		944	ev_unref (EV_A); /* child watcher should not keep loop alive */
		945	#endif
283	}	946	}
		947	else
		948	ev_default_loop_ptr = 0;
		949	}
		950
		951	return ev_default_loop_ptr;
		952	}
		953
		954	void
		955	ev_default_destroy (void)
		956	{
		957	#if EV_MULTIPLICITY
		958	struct ev_loop *loop = ev_default_loop_ptr;
		959	#endif
		960
		961	#ifndef _WIN32
		962	ev_ref (EV_A); /* child watcher */
		963	ev_signal_stop (EV_A_ &childev);
		964	#endif
		965
		966	ev_ref (EV_A); /* signal watcher */
		967	ev_io_stop (EV_A_ &sigev);
		968
		969	close (sigpipe [0]); sigpipe [0] = 0;
		970	close (sigpipe [1]); sigpipe [1] = 0;
		971
		972	loop_destroy (EV_A);
		973	}
		974
		975	void
		976	ev_default_fork (void)
		977	{
		978	#if EV_MULTIPLICITY
		979	struct ev_loop *loop = ev_default_loop_ptr;
		980	#endif
		981
		982	if (method)
		983	postfork = 1;
		984	}
		985
		986	/*****************************************************************************/
		987
		988	static int
		989	any_pending (EV_P)
		990	{
		991	int pri;
		992
		993	for (pri = NUMPRI; pri--; )
		994	if (pendingcnt [pri])
		995	return 1;
		996
		997	return 0;
		998	}
		999
		1000	static void
		1001	call_pending (EV_P)
		1002	{
		1003	int pri;
		1004
		1005	for (pri = NUMPRI; pri--; )
		1006	while (pendingcnt [pri])
		1007	{
		1008	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1009
		1010	if (p->w)
		1011	{
		1012	p->w->pending = 0;
		1013	EV_CB_INVOKE (p->w, p->events);
		1014	}
284	}	1015	}
285
286	pendingcnt = 0;
287	}	1016	}
288		1017
289	static void	1018	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1019	timers_reify (EV_P)
291	{	1020	{
292	while (timercnt && timers [0]->at <= now)	1021	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1022	{
294	struct ev_timer *w = timers [0];	1023	struct ev_timer *w = timers [0];
		1024
		1025	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		1026
296	/* first reschedule or stop timer */	1027	/* first reschedule or stop timer */
297	if (w->repeat)	1028	if (w->repeat)
298	{	1029	{
299	if (w->is_abs)	1030	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1031
301	else
302	w->at = now + w->repeat;	1032	((WT)w)->at += w->repeat;
		1033	if (((WT)w)->at < mn_now)
		1034	((WT)w)->at = mn_now;
303		1035
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	1036	downheap ((WT *)timers, timercnt, 0);
307	}	1037	}
308	else	1038	else
		1039	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1040
		1041	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1042	}
		1043	}
		1044
		1045	#if EV_PERIODICS
		1046	static void
		1047	periodics_reify (EV_P)
		1048	{
		1049	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1050	{
		1051	struct ev_periodic *w = periodics [0];
		1052
		1053	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1054
		1055	/* first reschedule or stop timer */
		1056	if (w->reschedule_cb)
309	{	1057	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1058	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	1059	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1060	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1061	}
		1062	else if (w->interval)
		1063	{
		1064	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1065	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1066	downheap ((WT *)periodics, periodiccnt, 0);
		1067	}
		1068	else
		1069	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1070
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1071	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1072	}
316	}	1073	}
317		1074
318	static void	1075	static void
319	time_update ()	1076	periodics_reschedule (EV_P)
320	{	1077	{
321	int i;	1078	int i;
		1079
		1080	/* adjust periodics after time jump */
		1081	for (i = 0; i < periodiccnt; ++i)
		1082	{
		1083	struct ev_periodic *w = periodics [i];
		1084
		1085	if (w->reschedule_cb)
		1086	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1087	else if (w->interval)
		1088	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1089	}
		1090
		1091	/* now rebuild the heap */
		1092	for (i = periodiccnt >> 1; i--; )
		1093	downheap ((WT *)periodics, periodiccnt, i);
		1094	}
		1095	#endif
		1096
		1097	inline int
		1098	time_update_monotonic (EV_P)
		1099	{
		1100	mn_now = get_clock ();
		1101
		1102	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1103	{
		1104	ev_rt_now = rtmn_diff + mn_now;
		1105	return 0;
		1106	}
		1107	else
		1108	{
		1109	now_floor = mn_now;
322	ev_now = ev_time ();	1110	ev_rt_now = ev_time ();
323		1111	return 1;
324	if (have_monotonic)
325	{	1112	}
326	ev_tstamp odiff = diff;	1113	}
327		1114
328	/* detecting time jumps is much more difficult */	1115	static void
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1116	time_update (EV_P)
		1117	{
		1118	int i;
		1119
		1120	#if EV_USE_MONOTONIC
		1121	if (expect_true (have_monotonic))
		1122	{
		1123	if (time_update_monotonic (EV_A))
330	{	1124	{
331	now = get_clock ();	1125	ev_tstamp odiff = rtmn_diff;
		1126
		1127	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1128	{
332	diff = ev_now - now;	1129	rtmn_diff = ev_rt_now - mn_now;
333		1130
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1131	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1132	return; /* all is well */
336		1133
337	ev_now = ev_time ();	1134	ev_rt_now = ev_time ();
		1135	mn_now = get_clock ();
		1136	now_floor = mn_now;
		1137	}
		1138
		1139	# if EV_PERIODICS
		1140	periodics_reschedule (EV_A);
		1141	# endif
		1142	/* no timer adjustment, as the monotonic clock doesn't jump */
		1143	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1144	}
		1145	}
		1146	else
		1147	#endif
		1148	{
		1149	ev_rt_now = ev_time ();
339		1150
340	/* time jump detected, reschedule atimers */	1151	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
341	for (i = 0; i < atimercnt; ++i)
342	{	1152	{
343	struct ev_timer *w = atimers [i];	1153	#if EV_PERIODICS
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1154	periodics_reschedule (EV_A);
		1155	#endif
		1156
		1157	/* adjust timers. this is easy, as the offset is the same for all */
		1158	for (i = 0; i < timercnt; ++i)
		1159	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1160	}
346	}
347	else
348	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* time jump detected, adjust rtimers */
351	for (i = 0; i < rtimercnt; ++i)
352	rtimers [i]->at += ev_now - now;
353		1161
354	now = ev_now;	1162	mn_now = ev_rt_now;
355	}	1163	}
356	}	1164	}
357		1165
358	int ev_loop_done;	1166	void
		1167	ev_ref (EV_P)
		1168	{
		1169	++activecnt;
		1170	}
359		1171
		1172	void
		1173	ev_unref (EV_P)
		1174	{
		1175	--activecnt;
		1176	}
		1177
		1178	static int loop_done;
		1179
		1180	void
360	void ev_loop (int flags)	1181	ev_loop (EV_P_ int flags)
361	{	1182	{
362	double block;	1183	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1184	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1185
365	do	1186	while (activecnt)
366	{	1187	{
		1188	/* queue check watchers (and execute them) */
		1189	if (expect_false (preparecnt))
		1190	{
		1191	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1192	call_pending (EV_A);
		1193	}
		1194
		1195	/* we might have forked, so reify kernel state if necessary */
		1196	if (expect_false (postfork))
		1197	loop_fork (EV_A);
		1198
367	/* update fd-related kernel structures */	1199	/* update fd-related kernel structures */
368	fd_reify ();	1200	fd_reify (EV_A);
369		1201
370	/* calculate blocking time */	1202	/* calculate blocking time */
		1203
		1204	/* we only need this for !monotonic clock or timers, but as we basically
		1205	always have timers, we just calculate it always */
		1206	#if EV_USE_MONOTONIC
		1207	if (expect_true (have_monotonic))
		1208	time_update_monotonic (EV_A);
		1209	else
		1210	#endif
		1211	{
		1212	ev_rt_now = ev_time ();
		1213	mn_now = ev_rt_now;
		1214	}
		1215
371	if (flags & EVLOOP_NONBLOCK)	1216	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1217	block = 0.;
373	else	1218	else
374	{	1219	{
375	block = MAX_BLOCKTIME;	1220	block = MAX_BLOCKTIME;
376		1221
377	if (rtimercnt)	1222	if (timercnt)
378	{	1223	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1224	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1225	if (block > to) block = to;
381	}	1226	}
382		1227
		1228	#if EV_PERIODICS
383	if (atimercnt)	1229	if (periodiccnt)
384	{	1230	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1231	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
386	if (block > to) block = to;	1232	if (block > to) block = to;
387	}	1233	}
		1234	#endif
388		1235
389	if (block < 0.) block = 0.;	1236	if (block < 0.) block = 0.;
390	}	1237	}
391		1238
392	method_poll (block);	1239	method_poll (EV_A_ block);
393		1240
394	/* update ev_now, do magic */	1241	/* update ev_rt_now, do magic */
395	time_update ();	1242	time_update (EV_A);
396		1243
397	/* put pending timers into pendign queue and reschedule them */	1244	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1245	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1246	#if EV_PERIODICS
400	/* relative timers second */	1247	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1248	#endif
402		1249
		1250	/* queue idle watchers unless io or timers are pending */
		1251	if (idlecnt && !any_pending (EV_A))
		1252	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1253
		1254	/* queue check watchers, to be executed first */
		1255	if (checkcnt)
		1256	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1257
403	call_pending ();	1258	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1259
408	static void	1260	if (loop_done)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1261	break;
		1262	}
		1263
		1264	if (loop_done != 2)
		1265	loop_done = 0;
		1266	}
		1267
		1268	void
		1269	ev_unloop (EV_P_ int how)
		1270	{
		1271	loop_done = how;
		1272	}
		1273
		1274	/*****************************************************************************/
		1275
		1276	inline void
		1277	wlist_add (WL *head, WL elem)
410	{	1278	{
411	elem->next = *head;	1279	elem->next = *head;
412	*head = elem;	1280	*head = elem;
413	}	1281	}
414		1282
415	static void	1283	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1284	wlist_del (WL *head, WL elem)
417	{	1285	{
418	while (*head)	1286	while (*head)
419	{	1287	{
420	if (*head == elem)	1288	if (*head == elem)
421	{	1289	{
…		…
425		1293
426	head = &(*head)->next;	1294	head = &(*head)->next;
427	}	1295	}
428	}	1296	}
429		1297
430	static void	1298	inline void
431	ev_start (struct ev_watcher *w, int active)	1299	ev_clear_pending (EV_P_ W w)
432	{	1300	{
		1301	if (w->pending)
		1302	{
		1303	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1304	w->pending = 0;
		1305	}
		1306	}
		1307
		1308	inline void
		1309	ev_start (EV_P_ W w, int active)
		1310	{
		1311	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1312	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1313
434	w->active = active;	1314	w->active = active;
		1315	ev_ref (EV_A);
435	}	1316	}
436		1317
437	static void	1318	inline void
438	ev_stop (struct ev_watcher *w)	1319	ev_stop (EV_P_ W w)
439	{	1320	{
440	if (w->pending)	1321	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1322	w->active = 0;
444	/* nop */
445	}	1323	}
446		1324
		1325	/*****************************************************************************/
		1326
447	void	1327	void
448	evio_start (struct ev_io *w)	1328	ev_io_start (EV_P_ struct ev_io *w)
449	{	1329	{
		1330	int fd = w->fd;
		1331
450	if (ev_is_active (w))	1332	if (ev_is_active (w))
451	return;	1333	return;
452		1334
453	int fd = w->fd;	1335	assert (("ev_io_start called with negative fd", fd >= 0));
454		1336
455	ev_start ((struct ev_watcher *)w, 1);	1337	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1338	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1339	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1340
459	++fdchangecnt;	1341	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1342	}
463		1343
464	void	1344	void
465	evio_stop (struct ev_io *w)	1345	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1346	{
		1347	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1348	if (!ev_is_active (w))
468	return;	1349	return;
469		1350
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1351	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
471	ev_stop ((struct ev_watcher *)w);
472		1352
473	++fdchangecnt;	1353	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1354	ev_stop (EV_A_ (W)w);
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}
477		1355
		1356	fd_change (EV_A_ w->fd);
		1357	}
		1358
478	void	1359	void
479	evtimer_start (struct ev_timer *w)	1360	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1361	{
481	if (ev_is_active (w))	1362	if (ev_is_active (w))
482	return;	1363	return;
483		1364
484	if (w->is_abs)	1365	((WT)w)->at += mn_now;
		1366
		1367	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1368
		1369	ev_start (EV_A_ (W)w, ++timercnt);
		1370	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1371	timers [timercnt - 1] = w;
		1372	upheap ((WT *)timers, timercnt - 1);
		1373
		1374	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1375	}
		1376
		1377	void
		1378	ev_timer_stop (EV_P_ struct ev_timer *w)
		1379	{
		1380	ev_clear_pending (EV_A_ (W)w);
		1381	if (!ev_is_active (w))
		1382	return;
		1383
		1384	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1385
		1386	if (((W)w)->active < timercnt--)
		1387	{
		1388	timers [((W)w)->active - 1] = timers [timercnt];
		1389	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1390	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1391
		1392	((WT)w)->at -= mn_now;
		1393
		1394	ev_stop (EV_A_ (W)w);
		1395	}
		1396
		1397	void
		1398	ev_timer_again (EV_P_ struct ev_timer *w)
		1399	{
		1400	if (ev_is_active (w))
		1401	{
487	if (w->repeat)	1402	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1403	{
489		1404	((WT)w)->at = mn_now + w->repeat;
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1405	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
491	array_needsize (atimers, atimermax, atimercnt, );	1406	}
492	atimers [atimercnt - 1] = w;	1407	else
493	upheap (atimers, atimercnt - 1);	1408	ev_timer_stop (EV_A_ w);
		1409	}
		1410	else if (w->repeat)
494	}	1411	{
		1412	w->at = w->repeat;
		1413	ev_timer_start (EV_A_ w);
		1414	}
		1415	}
		1416
		1417	#if EV_PERIODICS
		1418	void
		1419	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1420	{
		1421	if (ev_is_active (w))
		1422	return;
		1423
		1424	if (w->reschedule_cb)
		1425	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1426	else if (w->interval)
		1427	{
		1428	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1429	/* this formula differs from the one in periodic_reify because we do not always round up */
		1430	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1431	}
		1432
		1433	ev_start (EV_A_ (W)w, ++periodiccnt);
		1434	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1435	periodics [periodiccnt - 1] = w;
		1436	upheap ((WT *)periodics, periodiccnt - 1);
		1437
		1438	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1439	}
		1440
		1441	void
		1442	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1443	{
		1444	ev_clear_pending (EV_A_ (W)w);
		1445	if (!ev_is_active (w))
		1446	return;
		1447
		1448	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1449
		1450	if (((W)w)->active < periodiccnt--)
		1451	{
		1452	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1453	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1454	}
		1455
		1456	ev_stop (EV_A_ (W)w);
		1457	}
		1458
		1459	void
		1460	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1461	{
		1462	/* TODO: use adjustheap and recalculation */
		1463	ev_periodic_stop (EV_A_ w);
		1464	ev_periodic_start (EV_A_ w);
		1465	}
		1466	#endif
		1467
		1468	void
		1469	ev_idle_start (EV_P_ struct ev_idle *w)
		1470	{
		1471	if (ev_is_active (w))
		1472	return;
		1473
		1474	ev_start (EV_A_ (W)w, ++idlecnt);
		1475	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1476	idles [idlecnt - 1] = w;
		1477	}
		1478
		1479	void
		1480	ev_idle_stop (EV_P_ struct ev_idle *w)
		1481	{
		1482	ev_clear_pending (EV_A_ (W)w);
		1483	if (!ev_is_active (w))
		1484	return;
		1485
		1486	idles [((W)w)->active - 1] = idles [--idlecnt];
		1487	ev_stop (EV_A_ (W)w);
		1488	}
		1489
		1490	void
		1491	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1492	{
		1493	if (ev_is_active (w))
		1494	return;
		1495
		1496	ev_start (EV_A_ (W)w, ++preparecnt);
		1497	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1498	prepares [preparecnt - 1] = w;
		1499	}
		1500
		1501	void
		1502	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1503	{
		1504	ev_clear_pending (EV_A_ (W)w);
		1505	if (!ev_is_active (w))
		1506	return;
		1507
		1508	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1509	ev_stop (EV_A_ (W)w);
		1510	}
		1511
		1512	void
		1513	ev_check_start (EV_P_ struct ev_check *w)
		1514	{
		1515	if (ev_is_active (w))
		1516	return;
		1517
		1518	ev_start (EV_A_ (W)w, ++checkcnt);
		1519	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1520	checks [checkcnt - 1] = w;
		1521	}
		1522
		1523	void
		1524	ev_check_stop (EV_P_ struct ev_check *w)
		1525	{
		1526	ev_clear_pending (EV_A_ (W)w);
		1527	if (!ev_is_active (w))
		1528	return;
		1529
		1530	checks [((W)w)->active - 1] = checks [--checkcnt];
		1531	ev_stop (EV_A_ (W)w);
		1532	}
		1533
		1534	#ifndef SA_RESTART
		1535	# define SA_RESTART 0
		1536	#endif
		1537
		1538	void
		1539	ev_signal_start (EV_P_ struct ev_signal *w)
		1540	{
		1541	#if EV_MULTIPLICITY
		1542	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1543	#endif
		1544	if (ev_is_active (w))
		1545	return;
		1546
		1547	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1548
		1549	ev_start (EV_A_ (W)w, 1);
		1550	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1551	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1552
		1553	if (!((WL)w)->next)
		1554	{
		1555	#if _WIN32
		1556	signal (w->signum, sighandler);
		1557	#else
		1558	struct sigaction sa;
		1559	sa.sa_handler = sighandler;
		1560	sigfillset (&sa.sa_mask);
		1561	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1562	sigaction (w->signum, &sa, 0);
		1563	#endif
		1564	}
		1565	}
		1566
		1567	void
		1568	ev_signal_stop (EV_P_ struct ev_signal *w)
		1569	{
		1570	ev_clear_pending (EV_A_ (W)w);
		1571	if (!ev_is_active (w))
		1572	return;
		1573
		1574	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1575	ev_stop (EV_A_ (W)w);
		1576
		1577	if (!signals [w->signum - 1].head)
		1578	signal (w->signum, SIG_DFL);
		1579	}
		1580
		1581	void
		1582	ev_child_start (EV_P_ struct ev_child *w)
		1583	{
		1584	#if EV_MULTIPLICITY
		1585	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1586	#endif
		1587	if (ev_is_active (w))
		1588	return;
		1589
		1590	ev_start (EV_A_ (W)w, 1);
		1591	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1592	}
		1593
		1594	void
		1595	ev_child_stop (EV_P_ struct ev_child *w)
		1596	{
		1597	ev_clear_pending (EV_A_ (W)w);
		1598	if (!ev_is_active (w))
		1599	return;
		1600
		1601	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1602	ev_stop (EV_A_ (W)w);
		1603	}
		1604
		1605	/*****************************************************************************/
		1606
		1607	struct ev_once
		1608	{
		1609	struct ev_io io;
		1610	struct ev_timer to;
		1611	void (*cb)(int revents, void *arg);
		1612	void *arg;
		1613	};
		1614
		1615	static void
		1616	once_cb (EV_P_ struct ev_once *once, int revents)
		1617	{
		1618	void (*cb)(int revents, void *arg) = once->cb;
		1619	void *arg = once->arg;
		1620
		1621	ev_io_stop (EV_A_ &once->io);
		1622	ev_timer_stop (EV_A_ &once->to);
		1623	ev_free (once);
		1624
		1625	cb (revents, arg);
		1626	}
		1627
		1628	static void
		1629	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1630	{
		1631	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1632	}
		1633
		1634	static void
		1635	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1636	{
		1637	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1638	}
		1639
		1640	void
		1641	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1642	{
		1643	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1644
		1645	if (!once)
		1646	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1647	else
496	{	1648	{
497	w->at += now;	1649	once->cb = cb;
		1650	once->arg = arg;
498		1651
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1652	ev_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1653	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	1654	{
517	atimers [w->active - 1] = atimers [atimercnt];	1655	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1656	ev_io_start (EV_A_ &once->io);
519	}	1657	}
520	}	1658
521	else	1659	ev_init (&once->to, once_cb_to);
522	{	1660	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1661	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1662	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1663	ev_timer_start (EV_A_ &once->to);
527	}	1664	}
528	}	1665	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1666	}
532		1667
533	void	1668	#ifdef __cplusplus
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
542	}	1669	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/
555	#if 1
556
557	static void
558	sin_cb (struct ev_io *w, int revents)
559	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561	}
562
563	static void
564	ocb (struct ev_timer *w, int revents)
565	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}
570
571	int main (void)
572	{
573	struct ev_io sin;
574
575	ev_init (0);
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}
594	#endif	1670	#endif
595		1671
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;
604	}
605
606	#endif
607
608
609
610

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