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Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.133 by root, Fri Nov 23 11:32:22 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	# ifdef EV_CONFIG_H
		38	# include EV_CONFIG_H
		39	# else
		40	# include "config.h"
		41	# endif
		42
		43	# if HAVE_CLOCK_GETTIME
		44	# ifndef EV_USE_MONOTONIC
		45	# define EV_USE_MONOTONIC 1
		46	# endif
		47	# ifndef EV_USE_REALTIME
		48	# define EV_USE_REALTIME 1
		49	# endif
		50	# else
		51	# ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 0
		53	# endif
		54	# ifndef EV_USE_REALTIME
		55	# define EV_USE_REALTIME 0
		56	# endif
		57	# endif
		58
		59	# ifndef EV_USE_SELECT
		60	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		61	# define EV_USE_SELECT 1
		62	# else
		63	# define EV_USE_SELECT 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_POLL
		68	# if HAVE_POLL && HAVE_POLL_H
		69	# define EV_USE_POLL 1
		70	# else
		71	# define EV_USE_POLL 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_EPOLL
		76	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		77	# define EV_USE_EPOLL 1
		78	# else
		79	# define EV_USE_EPOLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_KQUEUE
		84	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		85	# define EV_USE_KQUEUE 1
		86	# else
		87	# define EV_USE_KQUEUE 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_PORT
		92	# if HAVE_PORT_H && HAVE_PORT_CREATE
		93	# define EV_USE_PORT 1
		94	# else
		95	# define EV_USE_PORT 0
		96	# endif
		97	# endif
		98
		99	#endif
		100
1	#include <math.h>	101	#include <math.h>
2	#include <stdlib.h>	102	#include <stdlib.h>
		103	#include <fcntl.h>
		104	#include <stddef.h>
3		105
4	#include <stdio.h>	106	#include <stdio.h>
5		107
6	#include <assert.h>	108	#include <assert.h>
7	#include <errno.h>	109	#include <errno.h>
8	#include <sys/time.h>	110	#include <sys/types.h>
9	#include <time.h>	111	#include <time.h>
10		112
		113	#include <signal.h>
		114
		115	#ifndef _WIN32
		116	# include <unistd.h>
		117	# include <sys/time.h>
		118	# include <sys/wait.h>
		119	#else
		120	# define WIN32_LEAN_AND_MEAN
		121	# include <windows.h>
		122	# ifndef EV_SELECT_IS_WINSOCKET
		123	# define EV_SELECT_IS_WINSOCKET 1
		124	# endif
		125	#endif
		126
		127	/**/
		128
		129	#ifndef EV_USE_MONOTONIC
		130	# define EV_USE_MONOTONIC 0
		131	#endif
		132
		133	#ifndef EV_USE_REALTIME
		134	# define EV_USE_REALTIME 0
		135	#endif
		136
		137	#ifndef EV_USE_SELECT
		138	# define EV_USE_SELECT 1
		139	#endif
		140
		141	#ifndef EV_USE_POLL
		142	# ifdef _WIN32
		143	# define EV_USE_POLL 0
		144	# else
		145	# define EV_USE_POLL 1
		146	# endif
		147	#endif
		148
		149	#ifndef EV_USE_EPOLL
		150	# define EV_USE_EPOLL 0
		151	#endif
		152
		153	#ifndef EV_USE_KQUEUE
		154	# define EV_USE_KQUEUE 0
		155	#endif
		156
		157	#ifndef EV_USE_PORT
		158	# define EV_USE_PORT 0
		159	#endif
		160
		161	/**/
		162
11	#ifdef CLOCK_MONOTONIC	163	#ifndef CLOCK_MONOTONIC
		164	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	165	# define EV_USE_MONOTONIC 0
13	#endif	166	#endif
14		167
		168	#ifndef CLOCK_REALTIME
		169	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	170	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	171	#endif
17	#define HAVE_SELECT 1	172
		173	#if EV_SELECT_IS_WINSOCKET
		174	# include <winsock.h>
		175	#endif
		176
		177	/**/
18		178
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	179	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	180	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		181	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		182	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		183
		184	#ifdef EV_H
		185	# include EV_H
		186	#else
22	#include "ev.h"	187	# include "ev.h"
		188	#endif
23		189
		190	#if __GNUC__ >= 3
		191	# define expect(expr,value) __builtin_expect ((expr),(value))
		192	# define inline static inline
		193	#else
		194	# define expect(expr,value) (expr)
		195	# define inline static
		196	#endif
		197
		198	#define expect_false(expr) expect ((expr) != 0, 0)
		199	#define expect_true(expr) expect ((expr) != 0, 1)
		200
		201	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		202	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		203
		204	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		205	#define EMPTY2(a,b) /* used to suppress some warnings */
		206
24	struct ev_watcher {	207	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	208	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	209	typedef struct ev_watcher_time *WT;
30	};
31		210
32	static ev_tstamp now, diff; /* monotonic clock */	211	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		212
		213	#ifdef _WIN32
		214	# include "ev_win32.c"
		215	#endif
		216
		217	/*****************************************************************************/
		218
		219	static void (*syserr_cb)(const char *msg);
		220
		221	void ev_set_syserr_cb (void (*cb)(const char *msg))
		222	{
		223	syserr_cb = cb;
		224	}
		225
		226	static void
		227	syserr (const char *msg)
		228	{
		229	if (!msg)
		230	msg = "(libev) system error";
		231
		232	if (syserr_cb)
		233	syserr_cb (msg);
		234	else
		235	{
		236	perror (msg);
		237	abort ();
		238	}
		239	}
		240
		241	static void *(*alloc)(void *ptr, long size);
		242
		243	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		244	{
		245	alloc = cb;
		246	}
		247
		248	static void *
		249	ev_realloc (void *ptr, long size)
		250	{
		251	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		252
		253	if (!ptr && size)
		254	{
		255	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		256	abort ();
		257	}
		258
		259	return ptr;
		260	}
		261
		262	#define ev_malloc(size) ev_realloc (0, (size))
		263	#define ev_free(ptr) ev_realloc ((ptr), 0)
		264
		265	/*****************************************************************************/
		266
		267	typedef struct
		268	{
		269	WL head;
		270	unsigned char events;
		271	unsigned char reify;
		272	#if EV_SELECT_IS_WINSOCKET
		273	SOCKET handle;
		274	#endif
		275	} ANFD;
		276
		277	typedef struct
		278	{
		279	W w;
		280	int events;
		281	} ANPENDING;
		282
		283	#if EV_MULTIPLICITY
		284
		285	struct ev_loop
		286	{
		287	ev_tstamp ev_rt_now;
		288	#define ev_rt_now ((loop)->ev_rt_now)
		289	#define VAR(name,decl) decl;
		290	#include "ev_vars.h"
		291	#undef VAR
		292	};
		293	#include "ev_wrap.h"
		294
		295	static struct ev_loop default_loop_struct;
		296	struct ev_loop *ev_default_loop_ptr;
		297
		298	#else
		299
33	ev_tstamp ev_now;	300	ev_tstamp ev_rt_now;
34	int ev_method;	301	#define VAR(name,decl) static decl;
		302	#include "ev_vars.h"
		303	#undef VAR
35		304
36	static int have_monotonic; /* runtime */	305	static int ev_default_loop_ptr;
37		306
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	307	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	308
40	static void (*method_poll)(ev_tstamp timeout);	309	/*****************************************************************************/
41		310
42	ev_tstamp	311	ev_tstamp
43	ev_time (void)	312	ev_time (void)
44	{	313	{
45	#if HAVE_REALTIME	314	#if EV_USE_REALTIME
46	struct timespec ts;	315	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	316	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	317	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	318	#else
50	struct timeval tv;	319	struct timeval tv;
51	gettimeofday (&tv, 0);	320	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	321	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	322	#endif
54	}	323	}
55		324
56	static ev_tstamp	325	inline ev_tstamp
57	get_clock (void)	326	get_clock (void)
58	{	327	{
59	#if HAVE_MONOTONIC	328	#if EV_USE_MONOTONIC
60	if (have_monotonic)	329	if (expect_true (have_monotonic))
61	{	330	{
62	struct timespec ts;	331	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	332	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	333	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	334	}
66	#endif	335	#endif
67		336
68	return ev_time ();	337	return ev_time ();
69	}	338	}
70		339
		340	#if EV_MULTIPLICITY
		341	ev_tstamp
		342	ev_now (EV_P)
		343	{
		344	return ev_rt_now;
		345	}
		346	#endif
		347
		348	#define array_roundsize(type,n) (((n) | 4) & ~3)
		349
71	#define array_needsize(base,cur,cnt,init) \	350	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	351	if (expect_false ((cnt) > cur)) \
73	{ \	352	{ \
74	int newcnt = cur ? cur << 1 : 16; \	353	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	354	do \
		355	{ \
		356	newcnt = array_roundsize (type, newcnt << 1); \
		357	} \
		358	while ((cnt) > newcnt); \
		359	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	360	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	361	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	362	cur = newcnt; \
79	}	363	}
80		364
81	typedef struct	365	#define array_slim(type,stem) \
82	{	366	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	367	{ \
84	unsigned char wev, rev; /* want, received event set */	368	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	369	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		370	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		371	}
86		372
87	static ANFD *anfds;	373	#define array_free(stem, idx) \
88	static int anfdmax;	374	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		375
90	static int *fdchanges;	376	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		377
93	static void	378	static void
94	anfds_init (ANFD *base, int count)	379	anfds_init (ANFD *base, int count)
95	{	380	{
96	while (count--)	381	while (count--)
97	{	382	{
98	base->head = 0;	383	base->head = 0;
99	base->wev = base->rev = EV_NONE;	384	base->events = EV_NONE;
		385	base->reify = 0;
		386
100	++base;	387	++base;
101	}	388	}
102	}	389	}
103		390
104	typedef struct	391	void
		392	ev_feed_event (EV_P_ void *w, int revents)
105	{	393	{
106	struct ev_watcher *w;	394	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		395
110	static ANPENDING *pendings;	396	if (expect_false (w_->pending))
111	static int pendingmax, pendingcnt;	397	{
		398	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		399	return;
		400	}
112		401
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	402	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	403	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
118	pendings [pendingcnt - 1].w = w;	404	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	405	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	406	}
121		407
122	static void	408	static void
		409	queue_events (EV_P_ W *events, int eventcnt, int type)
		410	{
		411	int i;
		412
		413	for (i = 0; i < eventcnt; ++i)
		414	ev_feed_event (EV_A_ events [i], type);
		415	}
		416
		417	inline void
123	fd_event (int fd, int events)	418	fd_event (EV_P_ int fd, int revents)
124	{	419	{
125	ANFD *anfd = anfds + fd;	420	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	421	struct ev_io *w;
127		422
128	for (w = anfd->head; w; w = w->next)	423	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	424	{
130	int ev = w->events & events;	425	int ev = w->events & revents;
131		426
132	if (ev)	427	if (ev)
133	event ((struct ev_watcher *)w, ev);	428	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	{	429	}
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	}	430	}
159		431
160	static void	432	void
161	downheap (struct ev_timer **timers, int N, int k)	433	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	434	{
163	struct ev_timer *w = timers [k];	435	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	}	436	}
183		437
184	static struct ev_signal **signals;	438	/*****************************************************************************/
185	static int signalmax;
186		439
187	static void	440	inline void
188	signals_init (struct ev_signal **base, int count)	441	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	{	442	{
247	int i;	443	int i;
248		444
249	for (i = 0; i < fdchangecnt; ++i)	445	for (i = 0; i < fdchangecnt; ++i)
250	{	446	{
251	int fd = fdchanges [i];	447	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	448	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	449	struct ev_io *w;
254		450
255	int wev = 0;	451	int events = 0;
256		452
257	for (w = anfd->head; w; w = w->next)	453	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	454	events |= w->events;
259		455
260	if (anfd->wev != wev)	456	#if EV_SELECT_IS_WINSOCKET
		457	if (events)
261	{	458	{
262	method_modify (fd, anfd->wev, wev);	459	unsigned long argp;
263	anfd->wev = wev;	460	anfd->handle = _get_osfhandle (fd);
		461	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	462	}
		463	#endif
		464
		465	anfd->reify = 0;
		466
		467	backend_modify (EV_A_ fd, anfd->events, events);
		468	anfd->events = events;
265	}	469	}
266		470
267	fdchangecnt = 0;	471	fdchangecnt = 0;
268	}	472	}
269		473
270	static void	474	static void
271	call_pending ()	475	fd_change (EV_P_ int fd)
		476	{
		477	if (expect_false (anfds [fd].reify))
		478	return;
		479
		480	anfds [fd].reify = 1;
		481
		482	++fdchangecnt;
		483	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		484	fdchanges [fdchangecnt - 1] = fd;
		485	}
		486
		487	static void
		488	fd_kill (EV_P_ int fd)
		489	{
		490	struct ev_io *w;
		491
		492	while ((w = (struct ev_io *)anfds [fd].head))
		493	{
		494	ev_io_stop (EV_A_ w);
		495	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		496	}
		497	}
		498
		499	inline int
		500	fd_valid (int fd)
		501	{
		502	#ifdef _WIN32
		503	return _get_osfhandle (fd) != -1;
		504	#else
		505	return fcntl (fd, F_GETFD) != -1;
		506	#endif
		507	}
		508
		509	/* called on EBADF to verify fds */
		510	static void
		511	fd_ebadf (EV_P)
		512	{
		513	int fd;
		514
		515	for (fd = 0; fd < anfdmax; ++fd)
		516	if (anfds [fd].events)
		517	if (!fd_valid (fd) == -1 && errno == EBADF)
		518	fd_kill (EV_A_ fd);
		519	}
		520
		521	/* called on ENOMEM in select/poll to kill some fds and retry */
		522	static void
		523	fd_enomem (EV_P)
		524	{
		525	int fd;
		526
		527	for (fd = anfdmax; fd--; )
		528	if (anfds [fd].events)
		529	{
		530	fd_kill (EV_A_ fd);
		531	return;
		532	}
		533	}
		534
		535	/* usually called after fork if backend needs to re-arm all fds from scratch */
		536	static void
		537	fd_rearm_all (EV_P)
		538	{
		539	int fd;
		540
		541	/* this should be highly optimised to not do anything but set a flag */
		542	for (fd = 0; fd < anfdmax; ++fd)
		543	if (anfds [fd].events)
		544	{
		545	anfds [fd].events = 0;
		546	fd_change (EV_A_ fd);
		547	}
		548	}
		549
		550	/*****************************************************************************/
		551
		552	static void
		553	upheap (WT *heap, int k)
		554	{
		555	WT w = heap [k];
		556
		557	while (k && heap [k >> 1]->at > w->at)
		558	{
		559	heap [k] = heap [k >> 1];
		560	((W)heap [k])->active = k + 1;
		561	k >>= 1;
		562	}
		563
		564	heap [k] = w;
		565	((W)heap [k])->active = k + 1;
		566
		567	}
		568
		569	static void
		570	downheap (WT *heap, int N, int k)
		571	{
		572	WT w = heap [k];
		573
		574	while (k < (N >> 1))
		575	{
		576	int j = k << 1;
		577
		578	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		579	++j;
		580
		581	if (w->at <= heap [j]->at)
		582	break;
		583
		584	heap [k] = heap [j];
		585	((W)heap [k])->active = k + 1;
		586	k = j;
		587	}
		588
		589	heap [k] = w;
		590	((W)heap [k])->active = k + 1;
		591	}
		592
		593	inline void
		594	adjustheap (WT *heap, int N, int k)
		595	{
		596	upheap (heap, k);
		597	downheap (heap, N, k);
		598	}
		599
		600	/*****************************************************************************/
		601
		602	typedef struct
		603	{
		604	WL head;
		605	sig_atomic_t volatile gotsig;
		606	} ANSIG;
		607
		608	static ANSIG *signals;
		609	static int signalmax;
		610
		611	static int sigpipe [2];
		612	static sig_atomic_t volatile gotsig;
		613	static struct ev_io sigev;
		614
		615	static void
		616	signals_init (ANSIG *base, int count)
		617	{
		618	while (count--)
		619	{
		620	base->head = 0;
		621	base->gotsig = 0;
		622
		623	++base;
		624	}
		625	}
		626
		627	static void
		628	sighandler (int signum)
		629	{
		630	#if _WIN32
		631	signal (signum, sighandler);
		632	#endif
		633
		634	signals [signum - 1].gotsig = 1;
		635
		636	if (!gotsig)
		637	{
		638	int old_errno = errno;
		639	gotsig = 1;
		640	write (sigpipe [1], &signum, 1);
		641	errno = old_errno;
		642	}
		643	}
		644
		645	void
		646	ev_feed_signal_event (EV_P_ int signum)
		647	{
		648	WL w;
		649
		650	#if EV_MULTIPLICITY
		651	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		652	#endif
		653
		654	--signum;
		655
		656	if (signum < 0 || signum >= signalmax)
		657	return;
		658
		659	signals [signum].gotsig = 0;
		660
		661	for (w = signals [signum].head; w; w = w->next)
		662	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		663	}
		664
		665	static void
		666	sigcb (EV_P_ struct ev_io *iow, int revents)
		667	{
		668	int signum;
		669
		670	read (sigpipe [0], &revents, 1);
		671	gotsig = 0;
		672
		673	for (signum = signalmax; signum--; )
		674	if (signals [signum].gotsig)
		675	ev_feed_signal_event (EV_A_ signum + 1);
		676	}
		677
		678	static void
		679	fd_intern (int fd)
		680	{
		681	#ifdef _WIN32
		682	int arg = 1;
		683	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		684	#else
		685	fcntl (fd, F_SETFD, FD_CLOEXEC);
		686	fcntl (fd, F_SETFL, O_NONBLOCK);
		687	#endif
		688	}
		689
		690	static void
		691	siginit (EV_P)
		692	{
		693	fd_intern (sigpipe [0]);
		694	fd_intern (sigpipe [1]);
		695
		696	ev_io_set (&sigev, sigpipe [0], EV_READ);
		697	ev_io_start (EV_A_ &sigev);
		698	ev_unref (EV_A); /* child watcher should not keep loop alive */
		699	}
		700
		701	/*****************************************************************************/
		702
		703	static struct ev_child *childs [PID_HASHSIZE];
		704
		705	#ifndef _WIN32
		706
		707	static struct ev_signal childev;
		708
		709	#ifndef WCONTINUED
		710	# define WCONTINUED 0
		711	#endif
		712
		713	static void
		714	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		715	{
		716	struct ev_child *w;
		717
		718	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		719	if (w->pid == pid || !w->pid)
		720	{
		721	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		722	w->rpid = pid;
		723	w->rstatus = status;
		724	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		725	}
		726	}
		727
		728	static void
		729	childcb (EV_P_ struct ev_signal *sw, int revents)
		730	{
		731	int pid, status;
		732
		733	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		734	{
		735	/* make sure we are called again until all childs have been reaped */
		736	/* we need to do it this way so that the callback gets called before we continue */
		737	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		738
		739	child_reap (EV_A_ sw, pid, pid, status);
		740	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		741	}
		742	}
		743
		744	#endif
		745
		746	/*****************************************************************************/
		747
		748	#if EV_USE_PORT
		749	# include "ev_port.c"
		750	#endif
		751	#if EV_USE_KQUEUE
		752	# include "ev_kqueue.c"
		753	#endif
		754	#if EV_USE_EPOLL
		755	# include "ev_epoll.c"
		756	#endif
		757	#if EV_USE_POLL
		758	# include "ev_poll.c"
		759	#endif
		760	#if EV_USE_SELECT
		761	# include "ev_select.c"
		762	#endif
		763
		764	int
		765	ev_version_major (void)
		766	{
		767	return EV_VERSION_MAJOR;
		768	}
		769
		770	int
		771	ev_version_minor (void)
		772	{
		773	return EV_VERSION_MINOR;
		774	}
		775
		776	/* return true if we are running with elevated privileges and should ignore env variables */
		777	static int
		778	enable_secure (void)
		779	{
		780	#ifdef _WIN32
		781	return 0;
		782	#else
		783	return getuid () != geteuid ()
		784	|| getgid () != getegid ();
		785	#endif
		786	}
		787
		788	unsigned int
		789	ev_supported_backends (void)
		790	{
		791	unsigned int flags = 0;
		792
		793	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		794	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		795	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		796	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		797	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		798
		799	return flags;
		800	}
		801
		802	unsigned int
		803	ev_recommended_backends (void)
		804	{
		805	unsigned int flags = ev_supported_backends ();
		806
		807	#ifndef __NetBSD__
		808	/* kqueue is borked on everything but netbsd apparently */
		809	/* it usually doesn't work correctly on anything but sockets and pipes */
		810	flags &= ~EVBACKEND_KQUEUE;
		811	#endif
		812	#ifdef __APPLE__
		813	// flags &= ~EVBACKEND_KQUEUE; for documentation
		814	flags &= ~EVBACKEND_POLL;
		815	#endif
		816
		817	return flags;
		818	}
		819
		820	unsigned int
		821	ev_backend (EV_P)
		822	{
		823	return backend;
		824	}
		825
		826	static void
		827	loop_init (EV_P_ unsigned int flags)
		828	{
		829	if (!backend)
		830	{
		831	#if EV_USE_MONOTONIC
		832	{
		833	struct timespec ts;
		834	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		835	have_monotonic = 1;
		836	}
		837	#endif
		838
		839	ev_rt_now = ev_time ();
		840	mn_now = get_clock ();
		841	now_floor = mn_now;
		842	rtmn_diff = ev_rt_now - mn_now;
		843
		844	if (!(flags & EVFLAG_NOENV)
		845	&& !enable_secure ()
		846	&& getenv ("LIBEV_FLAGS"))
		847	flags = atoi (getenv ("LIBEV_FLAGS"));
		848
		849	if (!(flags & 0x0000ffffUL))
		850	flags |= ev_recommended_backends ();
		851
		852	backend = 0;
		853	#if EV_USE_PORT
		854	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		855	#endif
		856	#if EV_USE_KQUEUE
		857	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		858	#endif
		859	#if EV_USE_EPOLL
		860	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		861	#endif
		862	#if EV_USE_POLL
		863	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		864	#endif
		865	#if EV_USE_SELECT
		866	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		867	#endif
		868
		869	ev_init (&sigev, sigcb);
		870	ev_set_priority (&sigev, EV_MAXPRI);
		871	}
		872	}
		873
		874	static void
		875	loop_destroy (EV_P)
272	{	876	{
273	int i;	877	int i;
274		878
275	for (i = 0; i < pendingcnt; ++i)	879	#if EV_USE_PORT
		880	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		881	#endif
		882	#if EV_USE_KQUEUE
		883	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		884	#endif
		885	#if EV_USE_EPOLL
		886	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		887	#endif
		888	#if EV_USE_POLL
		889	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		890	#endif
		891	#if EV_USE_SELECT
		892	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		893	#endif
		894
		895	for (i = NUMPRI; i--; )
		896	array_free (pending, [i]);
		897
		898	/* have to use the microsoft-never-gets-it-right macro */
		899	array_free (fdchange, EMPTY0);
		900	array_free (timer, EMPTY0);
		901	#if EV_PERIODICS
		902	array_free (periodic, EMPTY0);
		903	#endif
		904	array_free (idle, EMPTY0);
		905	array_free (prepare, EMPTY0);
		906	array_free (check, EMPTY0);
		907
		908	backend = 0;
		909	}
		910
		911	static void
		912	loop_fork (EV_P)
		913	{
		914	#if EV_USE_PORT
		915	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		916	#endif
		917	#if EV_USE_KQUEUE
		918	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		919	#endif
		920	#if EV_USE_EPOLL
		921	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		922	#endif
		923
		924	if (ev_is_active (&sigev))
		925	{
		926	/* default loop */
		927
		928	ev_ref (EV_A);
		929	ev_io_stop (EV_A_ &sigev);
		930	close (sigpipe [0]);
		931	close (sigpipe [1]);
		932
		933	while (pipe (sigpipe))
		934	syserr ("(libev) error creating pipe");
		935
		936	siginit (EV_A);
276	{	937	}
277	ANPENDING *p = pendings + i;
278		938
279	if (p->w)	939	postfork = 0;
		940	}
		941
		942	#if EV_MULTIPLICITY
		943	struct ev_loop *
		944	ev_loop_new (unsigned int flags)
		945	{
		946	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		947
		948	memset (loop, 0, sizeof (struct ev_loop));
		949
		950	loop_init (EV_A_ flags);
		951
		952	if (ev_backend (EV_A))
		953	return loop;
		954
		955	return 0;
		956	}
		957
		958	void
		959	ev_loop_destroy (EV_P)
		960	{
		961	loop_destroy (EV_A);
		962	ev_free (loop);
		963	}
		964
		965	void
		966	ev_loop_fork (EV_P)
		967	{
		968	postfork = 1;
		969	}
		970
		971	#endif
		972
		973	#if EV_MULTIPLICITY
		974	struct ev_loop *
		975	ev_default_loop_init (unsigned int flags)
		976	#else
		977	int
		978	ev_default_loop (unsigned int flags)
		979	#endif
		980	{
		981	if (sigpipe [0] == sigpipe [1])
		982	if (pipe (sigpipe))
		983	return 0;
		984
		985	if (!ev_default_loop_ptr)
		986	{
		987	#if EV_MULTIPLICITY
		988	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		989	#else
		990	ev_default_loop_ptr = 1;
		991	#endif
		992
		993	loop_init (EV_A_ flags);
		994
		995	if (ev_backend (EV_A))
280	{	996	{
281	p->w->pending = 0;	997	siginit (EV_A);
282	p->w->cb (p->w, p->events);	998
		999	#ifndef _WIN32
		1000	ev_signal_init (&childev, childcb, SIGCHLD);
		1001	ev_set_priority (&childev, EV_MAXPRI);
		1002	ev_signal_start (EV_A_ &childev);
		1003	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1004	#endif
283	}	1005	}
		1006	else
		1007	ev_default_loop_ptr = 0;
		1008	}
		1009
		1010	return ev_default_loop_ptr;
		1011	}
		1012
		1013	void
		1014	ev_default_destroy (void)
		1015	{
		1016	#if EV_MULTIPLICITY
		1017	struct ev_loop *loop = ev_default_loop_ptr;
		1018	#endif
		1019
		1020	#ifndef _WIN32
		1021	ev_ref (EV_A); /* child watcher */
		1022	ev_signal_stop (EV_A_ &childev);
		1023	#endif
		1024
		1025	ev_ref (EV_A); /* signal watcher */
		1026	ev_io_stop (EV_A_ &sigev);
		1027
		1028	close (sigpipe [0]); sigpipe [0] = 0;
		1029	close (sigpipe [1]); sigpipe [1] = 0;
		1030
		1031	loop_destroy (EV_A);
		1032	}
		1033
		1034	void
		1035	ev_default_fork (void)
		1036	{
		1037	#if EV_MULTIPLICITY
		1038	struct ev_loop *loop = ev_default_loop_ptr;
		1039	#endif
		1040
		1041	if (backend)
		1042	postfork = 1;
		1043	}
		1044
		1045	/*****************************************************************************/
		1046
		1047	static int
		1048	any_pending (EV_P)
		1049	{
		1050	int pri;
		1051
		1052	for (pri = NUMPRI; pri--; )
		1053	if (pendingcnt [pri])
		1054	return 1;
		1055
		1056	return 0;
		1057	}
		1058
		1059	inline void
		1060	call_pending (EV_P)
		1061	{
		1062	int pri;
		1063
		1064	for (pri = NUMPRI; pri--; )
		1065	while (pendingcnt [pri])
		1066	{
		1067	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1068
		1069	if (expect_true (p->w))
		1070	{
		1071	p->w->pending = 0;
		1072	EV_CB_INVOKE (p->w, p->events);
		1073	}
284	}	1074	}
285
286	pendingcnt = 0;
287	}	1075	}
288		1076
289	static void	1077	inline void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1078	timers_reify (EV_P)
291	{	1079	{
292	while (timercnt && timers [0]->at <= now)	1080	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1081	{
294	struct ev_timer *w = timers [0];	1082	struct ev_timer *w = timers [0];
		1083
		1084	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		1085
296	/* first reschedule or stop timer */	1086	/* first reschedule or stop timer */
297	if (w->repeat)	1087	if (w->repeat)
298	{	1088	{
299	if (w->is_abs)	1089	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;	1090
301	else
302	w->at = now + w->repeat;	1091	((WT)w)->at += w->repeat;
		1092	if (((WT)w)->at < mn_now)
		1093	((WT)w)->at = mn_now;
303		1094
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	1095	downheap ((WT *)timers, timercnt, 0);
307	}	1096	}
308	else	1097	else
		1098	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1099
		1100	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1101	}
		1102	}
		1103
		1104	#if EV_PERIODICS
		1105	inline void
		1106	periodics_reify (EV_P)
		1107	{
		1108	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1109	{
		1110	struct ev_periodic *w = periodics [0];
		1111
		1112	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1113
		1114	/* first reschedule or stop timer */
		1115	if (w->reschedule_cb)
309	{	1116	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1117	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	1118	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1119	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1120	}
		1121	else if (w->interval)
		1122	{
		1123	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1124	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1125	downheap ((WT *)periodics, periodiccnt, 0);
		1126	}
		1127	else
		1128	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1129
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1130	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1131	}
316	}	1132	}
317		1133
318	static void	1134	static void
319	time_update ()	1135	periodics_reschedule (EV_P)
320	{	1136	{
321	int i;	1137	int i;
		1138
		1139	/* adjust periodics after time jump */
		1140	for (i = 0; i < periodiccnt; ++i)
		1141	{
		1142	struct ev_periodic *w = periodics [i];
		1143
		1144	if (w->reschedule_cb)
		1145	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1146	else if (w->interval)
		1147	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1148	}
		1149
		1150	/* now rebuild the heap */
		1151	for (i = periodiccnt >> 1; i--; )
		1152	downheap ((WT *)periodics, periodiccnt, i);
		1153	}
		1154	#endif
		1155
		1156	inline int
		1157	time_update_monotonic (EV_P)
		1158	{
		1159	mn_now = get_clock ();
		1160
		1161	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1162	{
		1163	ev_rt_now = rtmn_diff + mn_now;
		1164	return 0;
		1165	}
		1166	else
		1167	{
		1168	now_floor = mn_now;
322	ev_now = ev_time ();	1169	ev_rt_now = ev_time ();
323		1170	return 1;
324	if (have_monotonic)
325	{	1171	}
326	ev_tstamp odiff = diff;	1172	}
327		1173
328	/* detecting time jumps is much more difficult */	1174	inline void
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1175	time_update (EV_P)
		1176	{
		1177	int i;
		1178
		1179	#if EV_USE_MONOTONIC
		1180	if (expect_true (have_monotonic))
		1181	{
		1182	if (time_update_monotonic (EV_A))
330	{	1183	{
331	now = get_clock ();	1184	ev_tstamp odiff = rtmn_diff;
		1185
		1186	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1187	{
332	diff = ev_now - now;	1188	rtmn_diff = ev_rt_now - mn_now;
333		1189
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1190	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1191	return; /* all is well */
336		1192
337	ev_now = ev_time ();	1193	ev_rt_now = ev_time ();
		1194	mn_now = get_clock ();
		1195	now_floor = mn_now;
		1196	}
		1197
		1198	# if EV_PERIODICS
		1199	periodics_reschedule (EV_A);
		1200	# endif
		1201	/* no timer adjustment, as the monotonic clock doesn't jump */
		1202	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1203	}
		1204	}
		1205	else
		1206	#endif
		1207	{
		1208	ev_rt_now = ev_time ();
339		1209
340	/* time jump detected, reschedule atimers */	1210	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	{	1211	{
343	struct ev_timer *w = atimers [i];	1212	#if EV_PERIODICS
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1213	periodics_reschedule (EV_A);
		1214	#endif
		1215
		1216	/* adjust timers. this is easy, as the offset is the same for all */
		1217	for (i = 0; i < timercnt; ++i)
		1218	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1219	}
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		1220
354	now = ev_now;	1221	mn_now = ev_rt_now;
355	}	1222	}
356	}	1223	}
357		1224
358	int ev_loop_done;	1225	void
		1226	ev_ref (EV_P)
		1227	{
		1228	++activecnt;
		1229	}
359		1230
		1231	void
		1232	ev_unref (EV_P)
		1233	{
		1234	--activecnt;
		1235	}
		1236
		1237	static int loop_done;
		1238
		1239	void
360	void ev_loop (int flags)	1240	ev_loop (EV_P_ int flags)
361	{	1241	{
362	double block;	1242	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1243	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1244
365	do	1245	while (activecnt)
366	{	1246	{
		1247	/* queue check watchers (and execute them) */
		1248	if (expect_false (preparecnt))
		1249	{
		1250	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1251	call_pending (EV_A);
		1252	}
		1253
		1254	/* we might have forked, so reify kernel state if necessary */
		1255	if (expect_false (postfork))
		1256	loop_fork (EV_A);
		1257
367	/* update fd-related kernel structures */	1258	/* update fd-related kernel structures */
368	fd_reify ();	1259	fd_reify (EV_A);
369		1260
370	/* calculate blocking time */	1261	/* calculate blocking time */
		1262
		1263	/* we only need this for !monotonic clock or timers, but as we basically
		1264	always have timers, we just calculate it always */
		1265	#if EV_USE_MONOTONIC
		1266	if (expect_true (have_monotonic))
		1267	time_update_monotonic (EV_A);
		1268	else
		1269	#endif
		1270	{
		1271	ev_rt_now = ev_time ();
		1272	mn_now = ev_rt_now;
		1273	}
		1274
371	if (flags & EVLOOP_NONBLOCK)	1275	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1276	block = 0.;
373	else	1277	else
374	{	1278	{
375	block = MAX_BLOCKTIME;	1279	block = MAX_BLOCKTIME;
376		1280
377	if (rtimercnt)	1281	if (timercnt)
378	{	1282	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1283	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1284	if (block > to) block = to;
381	}	1285	}
382		1286
		1287	#if EV_PERIODICS
383	if (atimercnt)	1288	if (periodiccnt)
384	{	1289	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1290	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1291	if (block > to) block = to;
387	}	1292	}
		1293	#endif
388		1294
389	if (block < 0.) block = 0.;	1295	if (expect_false (block < 0.)) block = 0.;
390	}	1296	}
391		1297
392	method_poll (block);	1298	backend_poll (EV_A_ block);
393		1299
394	/* update ev_now, do magic */	1300	/* update ev_rt_now, do magic */
395	time_update ();	1301	time_update (EV_A);
396		1302
397	/* put pending timers into pendign queue and reschedule them */	1303	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1304	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1305	#if EV_PERIODICS
400	/* relative timers second */	1306	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1307	#endif
402		1308
		1309	/* queue idle watchers unless io or timers are pending */
		1310	if (idlecnt && !any_pending (EV_A))
		1311	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1312
		1313	/* queue check watchers, to be executed first */
		1314	if (expect_false (checkcnt))
		1315	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1316
403	call_pending ();	1317	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1318
408	static void	1319	if (expect_false (loop_done))
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1320	break;
		1321	}
		1322
		1323	if (loop_done != 2)
		1324	loop_done = 0;
		1325	}
		1326
		1327	void
		1328	ev_unloop (EV_P_ int how)
		1329	{
		1330	loop_done = how;
		1331	}
		1332
		1333	/*****************************************************************************/
		1334
		1335	inline void
		1336	wlist_add (WL *head, WL elem)
410	{	1337	{
411	elem->next = *head;	1338	elem->next = *head;
412	*head = elem;	1339	*head = elem;
413	}	1340	}
414		1341
415	static void	1342	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1343	wlist_del (WL *head, WL elem)
417	{	1344	{
418	while (*head)	1345	while (*head)
419	{	1346	{
420	if (*head == elem)	1347	if (*head == elem)
421	{	1348	{
…		…
425		1352
426	head = &(*head)->next;	1353	head = &(*head)->next;
427	}	1354	}
428	}	1355	}
429		1356
430	static void	1357	inline void
431	ev_start (struct ev_watcher *w, int active)	1358	ev_clear_pending (EV_P_ W w)
432	{	1359	{
		1360	if (w->pending)
		1361	{
		1362	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1363	w->pending = 0;
		1364	}
		1365	}
		1366
		1367	inline void
		1368	ev_start (EV_P_ W w, int active)
		1369	{
		1370	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1371	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1372
434	w->active = active;	1373	w->active = active;
		1374	ev_ref (EV_A);
435	}	1375	}
436		1376
437	static void	1377	inline void
438	ev_stop (struct ev_watcher *w)	1378	ev_stop (EV_P_ W w)
439	{	1379	{
440	if (w->pending)	1380	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1381	w->active = 0;
444	/* nop */
445	}	1382	}
446		1383
		1384	/*****************************************************************************/
		1385
447	void	1386	void
448	evio_start (struct ev_io *w)	1387	ev_io_start (EV_P_ struct ev_io *w)
		1388	{
		1389	int fd = w->fd;
		1390
		1391	if (expect_false (ev_is_active (w)))
		1392	return;
		1393
		1394	assert (("ev_io_start called with negative fd", fd >= 0));
		1395
		1396	ev_start (EV_A_ (W)w, 1);
		1397	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1398	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1399
		1400	fd_change (EV_A_ fd);
		1401	}
		1402
		1403	void
		1404	ev_io_stop (EV_P_ struct ev_io *w)
		1405	{
		1406	ev_clear_pending (EV_A_ (W)w);
		1407	if (expect_false (!ev_is_active (w)))
		1408	return;
		1409
		1410	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1411
		1412	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1413	ev_stop (EV_A_ (W)w);
		1414
		1415	fd_change (EV_A_ w->fd);
		1416	}
		1417
		1418	void
		1419	ev_timer_start (EV_P_ struct ev_timer *w)
		1420	{
		1421	if (expect_false (ev_is_active (w)))
		1422	return;
		1423
		1424	((WT)w)->at += mn_now;
		1425
		1426	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1427
		1428	ev_start (EV_A_ (W)w, ++timercnt);
		1429	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1430	timers [timercnt - 1] = w;
		1431	upheap ((WT *)timers, timercnt - 1);
		1432
		1433	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1434	}
		1435
		1436	void
		1437	ev_timer_stop (EV_P_ struct ev_timer *w)
		1438	{
		1439	ev_clear_pending (EV_A_ (W)w);
		1440	if (expect_false (!ev_is_active (w)))
		1441	return;
		1442
		1443	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1444
		1445	if (expect_true (((W)w)->active < timercnt--))
		1446	{
		1447	timers [((W)w)->active - 1] = timers [timercnt];
		1448	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1449	}
		1450
		1451	((WT)w)->at -= mn_now;
		1452
		1453	ev_stop (EV_A_ (W)w);
		1454	}
		1455
		1456	void
		1457	ev_timer_again (EV_P_ struct ev_timer *w)
449	{	1458	{
450	if (ev_is_active (w))	1459	if (ev_is_active (w))
		1460	{
		1461	if (w->repeat)
		1462	{
		1463	((WT)w)->at = mn_now + w->repeat;
		1464	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1465	}
		1466	else
		1467	ev_timer_stop (EV_A_ w);
		1468	}
		1469	else if (w->repeat)
		1470	{
		1471	w->at = w->repeat;
		1472	ev_timer_start (EV_A_ w);
		1473	}
		1474	}
		1475
		1476	#if EV_PERIODICS
		1477	void
		1478	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1479	{
		1480	if (expect_false (ev_is_active (w)))
451	return;	1481	return;
452		1482
453	int fd = w->fd;	1483	if (w->reschedule_cb)
		1484	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1485	else if (w->interval)
		1486	{
		1487	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1488	/* this formula differs from the one in periodic_reify because we do not always round up */
		1489	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1490	}
454		1491
455	ev_start ((struct ev_watcher *)w, 1);	1492	ev_start (EV_A_ (W)w, ++periodiccnt);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1493	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1494	periodics [periodiccnt - 1] = w;
		1495	upheap ((WT *)periodics, periodiccnt - 1);
458		1496
459	++fdchangecnt;	1497	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1498	}
463		1499
464	void	1500	void
465	evio_stop (struct ev_io *w)	1501	ev_periodic_stop (EV_P_ struct ev_periodic *w)
466	{	1502	{
		1503	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1504	if (expect_false (!ev_is_active (w)))
468	return;	1505	return;
469		1506
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1507	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
471	ev_stop ((struct ev_watcher *)w);
472		1508
473	++fdchangecnt;	1509	if (expect_true (((W)w)->active < periodiccnt--))
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1510	{
475	fdchanges [fdchangecnt - 1] = w->fd;	1511	periodics [((W)w)->active - 1] = periodics [periodiccnt];
476	}	1512	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1513	}
477		1514
		1515	ev_stop (EV_A_ (W)w);
		1516	}
		1517
478	void	1518	void
		1519	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1520	{
		1521	/* TODO: use adjustheap and recalculation */
		1522	ev_periodic_stop (EV_A_ w);
		1523	ev_periodic_start (EV_A_ w);
		1524	}
		1525	#endif
		1526
		1527	void
479	evtimer_start (struct ev_timer *w)	1528	ev_idle_start (EV_P_ struct ev_idle *w)
480	{	1529	{
481	if (ev_is_active (w))	1530	if (expect_false (ev_is_active (w)))
482	return;	1531	return;
483		1532
484	if (w->is_abs)	1533	ev_start (EV_A_ (W)w, ++idlecnt);
485	{	1534	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, EMPTY2);
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1535	idles [idlecnt - 1] = w;
487	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
489
490	ev_start ((struct ev_watcher *)w, ++atimercnt);
491	array_needsize (atimers, atimermax, atimercnt, );
492	atimers [atimercnt - 1] = w;
493	upheap (atimers, atimercnt - 1);
494	}
495	else
496	{
497	w->at += now;
498
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);
500	array_needsize (rtimers, rtimermax, rtimercnt, );
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}	1536	}
506		1537
507	void	1538	void
508	evtimer_stop (struct ev_timer *w)	1539	ev_idle_stop (EV_P_ struct ev_idle *w)
509	{	1540	{
		1541	ev_clear_pending (EV_A_ (W)w);
510	if (!ev_is_active (w))	1542	if (expect_false (!ev_is_active (w)))
511	return;	1543	return;
512		1544
513	if (w->is_abs)	1545	idles [((W)w)->active - 1] = idles [--idlecnt];
514	{	1546	ev_stop (EV_A_ (W)w);
515	if (w->active < atimercnt--)
516	{
517	atimers [w->active - 1] = atimers [atimercnt];
518	downheap (atimers, atimercnt, w->active - 1);
519	}
520	}
521	else
522	{
523	if (w->active < rtimercnt--)
524	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];
526	downheap (rtimers, rtimercnt, w->active - 1);
527	}
528	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1547	}
532		1548
533	void	1549	void
534	evsignal_start (struct ev_signal *w)	1550	ev_prepare_start (EV_P_ struct ev_prepare *w)
535	{	1551	{
536	if (ev_is_active (w))	1552	if (expect_false (ev_is_active (w)))
537	return;	1553	return;
538		1554
539	ev_start ((struct ev_watcher *)w, 1);	1555	ev_start (EV_A_ (W)w, ++preparecnt);
540	array_needsize (signals, signalmax, w->signum, signals_init);	1556	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1557	prepares [preparecnt - 1] = w;
542	}	1558	}
543		1559
544	void	1560	void
545	evsignal_stop (struct ev_signal *w)	1561	ev_prepare_stop (EV_P_ struct ev_prepare *w)
546	{	1562	{
		1563	ev_clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	1564	if (expect_false (!ev_is_active (w)))
548	return;	1565	return;
549		1566
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1567	prepares [((W)w)->active - 1] = prepares [--preparecnt];
551	ev_stop ((struct ev_watcher *)w);	1568	ev_stop (EV_A_ (W)w);
		1569	}
		1570
		1571	void
		1572	ev_check_start (EV_P_ struct ev_check *w)
		1573	{
		1574	if (expect_false (ev_is_active (w)))
		1575	return;
		1576
		1577	ev_start (EV_A_ (W)w, ++checkcnt);
		1578	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1579	checks [checkcnt - 1] = w;
		1580	}
		1581
		1582	void
		1583	ev_check_stop (EV_P_ struct ev_check *w)
		1584	{
		1585	ev_clear_pending (EV_A_ (W)w);
		1586	if (expect_false (!ev_is_active (w)))
		1587	return;
		1588
		1589	checks [((W)w)->active - 1] = checks [--checkcnt];
		1590	ev_stop (EV_A_ (W)w);
		1591	}
		1592
		1593	#ifndef SA_RESTART
		1594	# define SA_RESTART 0
		1595	#endif
		1596
		1597	void
		1598	ev_signal_start (EV_P_ struct ev_signal *w)
		1599	{
		1600	#if EV_MULTIPLICITY
		1601	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1602	#endif
		1603	if (expect_false (ev_is_active (w)))
		1604	return;
		1605
		1606	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1607
		1608	ev_start (EV_A_ (W)w, 1);
		1609	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1610	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1611
		1612	if (!((WL)w)->next)
		1613	{
		1614	#if _WIN32
		1615	signal (w->signum, sighandler);
		1616	#else
		1617	struct sigaction sa;
		1618	sa.sa_handler = sighandler;
		1619	sigfillset (&sa.sa_mask);
		1620	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1621	sigaction (w->signum, &sa, 0);
		1622	#endif
		1623	}
		1624	}
		1625
		1626	void
		1627	ev_signal_stop (EV_P_ struct ev_signal *w)
		1628	{
		1629	ev_clear_pending (EV_A_ (W)w);
		1630	if (expect_false (!ev_is_active (w)))
		1631	return;
		1632
		1633	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1634	ev_stop (EV_A_ (W)w);
		1635
		1636	if (!signals [w->signum - 1].head)
		1637	signal (w->signum, SIG_DFL);
		1638	}
		1639
		1640	void
		1641	ev_child_start (EV_P_ struct ev_child *w)
		1642	{
		1643	#if EV_MULTIPLICITY
		1644	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1645	#endif
		1646	if (expect_false (ev_is_active (w)))
		1647	return;
		1648
		1649	ev_start (EV_A_ (W)w, 1);
		1650	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1651	}
		1652
		1653	void
		1654	ev_child_stop (EV_P_ struct ev_child *w)
		1655	{
		1656	ev_clear_pending (EV_A_ (W)w);
		1657	if (expect_false (!ev_is_active (w)))
		1658	return;
		1659
		1660	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1661	ev_stop (EV_A_ (W)w);
552	}	1662	}
553		1663
554	/*****************************************************************************/	1664	/*****************************************************************************/
555	#if 1
556		1665
557	static void	1666	struct ev_once
558	sin_cb (struct ev_io *w, int revents)
559	{	1667	{
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;	1668	struct ev_io io;
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
595
596	struct ev_timer t1;	1669	struct ev_timer to;
597	evw_init (&t1, ocb, 0);	1670	void (*cb)(int revents, void *arg);
598	evtimer_set_abs (&t1, 5, 10);	1671	void *arg;
599	evtimer_start (&t1);	1672	};
600		1673
601	ev_loop (0);	1674	static void
		1675	once_cb (EV_P_ struct ev_once *once, int revents)
		1676	{
		1677	void (*cb)(int revents, void *arg) = once->cb;
		1678	void *arg = once->arg;
602		1679
		1680	ev_io_stop (EV_A_ &once->io);
		1681	ev_timer_stop (EV_A_ &once->to);
		1682	ev_free (once);
		1683
		1684	cb (revents, arg);
		1685	}
		1686
		1687	static void
		1688	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1689	{
		1690	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1691	}
		1692
		1693	static void
		1694	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1695	{
		1696	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1697	}
		1698
		1699	void
		1700	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1701	{
		1702	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1703
		1704	if (expect_false (!once))
		1705	{
		1706	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
603	return 0;	1707	return;
604	}	1708	}
605		1709
606	#endif	1710	once->cb = cb;
		1711	once->arg = arg;
607		1712
		1713	ev_init (&once->io, once_cb_io);
		1714	if (fd >= 0)
		1715	{
		1716	ev_io_set (&once->io, fd, events);
		1717	ev_io_start (EV_A_ &once->io);
		1718	}
608		1719
		1720	ev_init (&once->to, once_cb_to);
		1721	if (timeout >= 0.)
		1722	{
		1723	ev_timer_set (&once->to, timeout, 0.);
		1724	ev_timer_start (EV_A_ &once->to);
		1725	}
		1726	}
609		1727
		1728	#ifdef __cplusplus
		1729	}
		1730	#endif
610		1731

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