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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 1.132 by root, Fri Nov 23 10:36:30 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	# else
		47	# ifndef EV_USE_MONOTONIC
		48	# define EV_USE_MONOTONIC 0
		49	# endif
		50	# ifndef EV_USE_REALTIME
		51	# define EV_USE_REALTIME 0
		52	# endif
		53	# endif
		54
		55	# ifndef EV_USE_SELECT
		56	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		57	# define EV_USE_SELECT 1
		58	# else
		59	# define EV_USE_SELECT 0
		60	# endif
		61	# endif
		62
		63	# ifndef EV_USE_POLL
		64	# if HAVE_POLL && HAVE_POLL_H
		65	# define EV_USE_POLL 1
		66	# else
		67	# define EV_USE_POLL 0
		68	# endif
		69	# endif
		70
		71	# ifndef EV_USE_EPOLL
		72	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		73	# define EV_USE_EPOLL 1
		74	# else
		75	# define EV_USE_EPOLL 0
		76	# endif
		77	# endif
		78
		79	# ifndef EV_USE_KQUEUE
		80	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		81	# define EV_USE_KQUEUE 1
		82	# else
		83	# define EV_USE_KQUEUE 0
		84	# endif
		85	# endif
		86
		87	# ifndef EV_USE_PORT
		88	# if HAVE_PORT_H && HAVE_PORT_CREATE
		89	# define EV_USE_PORT 1
		90	# else
		91	# define EV_USE_PORT 0
		92	# endif
		93	# endif
		94
		95	#endif
		96
1	#include <math.h>	97	#include <math.h>
2	#include <stdlib.h>	98	#include <stdlib.h>
		99	#include <fcntl.h>
		100	#include <stddef.h>
3		101
4	#include <stdio.h>	102	#include <stdio.h>
5		103
6	#include <assert.h>	104	#include <assert.h>
7	#include <errno.h>	105	#include <errno.h>
8	#include <sys/time.h>	106	#include <sys/types.h>
9	#include <time.h>	107	#include <time.h>
10		108
		109	#include <signal.h>
		110
		111	#ifndef _WIN32
		112	# include <unistd.h>
		113	# include <sys/time.h>
		114	# include <sys/wait.h>
		115	#else
		116	# define WIN32_LEAN_AND_MEAN
		117	# include <windows.h>
		118	# ifndef EV_SELECT_IS_WINSOCKET
		119	# define EV_SELECT_IS_WINSOCKET 1
		120	# endif
		121	#endif
		122
		123	/**/
		124
		125	#ifndef EV_USE_MONOTONIC
		126	# define EV_USE_MONOTONIC 0
		127	#endif
		128
		129	#ifndef EV_USE_REALTIME
		130	# define EV_USE_REALTIME 0
		131	#endif
		132
		133	#ifndef EV_USE_SELECT
		134	# define EV_USE_SELECT 1
		135	#endif
		136
		137	#ifndef EV_USE_POLL
		138	# ifdef _WIN32
		139	# define EV_USE_POLL 0
		140	# else
		141	# define EV_USE_POLL 1
		142	# endif
		143	#endif
		144
		145	#ifndef EV_USE_EPOLL
		146	# define EV_USE_EPOLL 0
		147	#endif
		148
		149	#ifndef EV_USE_KQUEUE
		150	# define EV_USE_KQUEUE 0
		151	#endif
		152
		153	#ifndef EV_USE_PORT
		154	# define EV_USE_PORT 0
		155	#endif
		156
		157	/**/
		158
11	#ifdef CLOCK_MONOTONIC	159	#ifndef CLOCK_MONOTONIC
		160	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	161	# define EV_USE_MONOTONIC 0
13	#endif	162	#endif
14		163
		164	#ifndef CLOCK_REALTIME
		165	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	166	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	167	#endif
17	#define HAVE_SELECT 1	168
		169	#if EV_SELECT_IS_WINSOCKET
		170	# include <winsock.h>
		171	#endif
		172
		173	/**/
18		174
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	175	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	176	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		177	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		178	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
21		179
		180	#ifdef EV_H
		181	# include EV_H
		182	#else
22	#include "ev.h"	183	# include "ev.h"
		184	#endif
23		185
		186	#if __GNUC__ >= 3
		187	# define expect(expr,value) __builtin_expect ((expr),(value))
		188	# define inline static inline
		189	#else
		190	# define expect(expr,value) (expr)
		191	# define inline static
		192	#endif
		193
		194	#define expect_false(expr) expect ((expr) != 0, 0)
		195	#define expect_true(expr) expect ((expr) != 0, 1)
		196
		197	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		198	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		199
		200	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		201	#define EMPTY2(a,b) /* used to suppress some warnings */
		202
24	struct ev_watcher {	203	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	204	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	205	typedef struct ev_watcher_time *WT;
30	};
31		206
32	static ev_tstamp now, diff; /* monotonic clock */	207	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		208
		209	#ifdef _WIN32
		210	# include "ev_win32.c"
		211	#endif
		212
		213	/*****************************************************************************/
		214
		215	static void (*syserr_cb)(const char *msg);
		216
		217	void ev_set_syserr_cb (void (*cb)(const char *msg))
		218	{
		219	syserr_cb = cb;
		220	}
		221
		222	static void
		223	syserr (const char *msg)
		224	{
		225	if (!msg)
		226	msg = "(libev) system error";
		227
		228	if (syserr_cb)
		229	syserr_cb (msg);
		230	else
		231	{
		232	perror (msg);
		233	abort ();
		234	}
		235	}
		236
		237	static void *(*alloc)(void *ptr, long size);
		238
		239	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		240	{
		241	alloc = cb;
		242	}
		243
		244	static void *
		245	ev_realloc (void *ptr, long size)
		246	{
		247	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		248
		249	if (!ptr && size)
		250	{
		251	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		252	abort ();
		253	}
		254
		255	return ptr;
		256	}
		257
		258	#define ev_malloc(size) ev_realloc (0, (size))
		259	#define ev_free(ptr) ev_realloc ((ptr), 0)
		260
		261	/*****************************************************************************/
		262
		263	typedef struct
		264	{
		265	WL head;
		266	unsigned char events;
		267	unsigned char reify;
		268	#if EV_SELECT_IS_WINSOCKET
		269	SOCKET handle;
		270	#endif
		271	} ANFD;
		272
		273	typedef struct
		274	{
		275	W w;
		276	int events;
		277	} ANPENDING;
		278
		279	#if EV_MULTIPLICITY
		280
		281	struct ev_loop
		282	{
		283	ev_tstamp ev_rt_now;
		284	#define ev_rt_now ((loop)->ev_rt_now)
		285	#define VAR(name,decl) decl;
		286	#include "ev_vars.h"
		287	#undef VAR
		288	};
		289	#include "ev_wrap.h"
		290
		291	static struct ev_loop default_loop_struct;
		292	struct ev_loop *ev_default_loop_ptr;
		293
		294	#else
		295
33	ev_tstamp ev_now;	296	ev_tstamp ev_rt_now;
34	int ev_method;	297	#define VAR(name,decl) static decl;
		298	#include "ev_vars.h"
		299	#undef VAR
35		300
36	static int have_monotonic; /* runtime */	301	static int ev_default_loop_ptr;
37		302
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	303	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	304
40	static void (*method_poll)(ev_tstamp timeout);	305	/*****************************************************************************/
41		306
42	ev_tstamp	307	ev_tstamp
43	ev_time (void)	308	ev_time (void)
44	{	309	{
45	#if HAVE_REALTIME	310	#if EV_USE_REALTIME
46	struct timespec ts;	311	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	312	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	313	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	314	#else
50	struct timeval tv;	315	struct timeval tv;
51	gettimeofday (&tv, 0);	316	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	317	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	318	#endif
54	}	319	}
55		320
56	static ev_tstamp	321	inline ev_tstamp
57	get_clock (void)	322	get_clock (void)
58	{	323	{
59	#if HAVE_MONOTONIC	324	#if EV_USE_MONOTONIC
60	if (have_monotonic)	325	if (expect_true (have_monotonic))
61	{	326	{
62	struct timespec ts;	327	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	328	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	329	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	330	}
66	#endif	331	#endif
67		332
68	return ev_time ();	333	return ev_time ();
69	}	334	}
70		335
		336	#if EV_MULTIPLICITY
		337	ev_tstamp
		338	ev_now (EV_P)
		339	{
		340	return ev_rt_now;
		341	}
		342	#endif
		343
		344	#define array_roundsize(type,n) (((n) | 4) & ~3)
		345
71	#define array_needsize(base,cur,cnt,init) \	346	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	347	if (expect_false ((cnt) > cur)) \
73	{ \	348	{ \
74	int newcnt = cur ? cur << 1 : 16; \	349	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	350	do \
		351	{ \
		352	newcnt = array_roundsize (type, newcnt << 1); \
		353	} \
		354	while ((cnt) > newcnt); \
		355	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	356	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	357	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	358	cur = newcnt; \
79	}	359	}
80		360
81	typedef struct	361	#define array_slim(type,stem) \
82	{	362	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	363	{ \
84	unsigned char wev, rev; /* want, received event set */	364	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	365	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		366	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		367	}
86		368
87	static ANFD *anfds;	369	#define array_free(stem, idx) \
88	static int anfdmax;	370	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		371
90	static int *fdchanges;	372	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		373
93	static void	374	static void
94	anfds_init (ANFD *base, int count)	375	anfds_init (ANFD *base, int count)
95	{	376	{
96	while (count--)	377	while (count--)
97	{	378	{
98	base->head = 0;	379	base->head = 0;
99	base->wev = base->rev = EV_NONE;	380	base->events = EV_NONE;
		381	base->reify = 0;
		382
100	++base;	383	++base;
101	}	384	}
102	}	385	}
103		386
104	typedef struct	387	void
		388	ev_feed_event (EV_P_ void *w, int revents)
105	{	389	{
106	struct ev_watcher *w;	390	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		391
110	static ANPENDING *pendings;	392	if (expect_false (w_->pending))
111	static int pendingmax, pendingcnt;	393	{
		394	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		395	return;
		396	}
112		397
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	398	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	399	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
118	pendings [pendingcnt - 1].w = w;	400	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	401	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	402	}
121		403
122	static void	404	static void
		405	queue_events (EV_P_ W *events, int eventcnt, int type)
		406	{
		407	int i;
		408
		409	for (i = 0; i < eventcnt; ++i)
		410	ev_feed_event (EV_A_ events [i], type);
		411	}
		412
		413	inline void
123	fd_event (int fd, int events)	414	fd_event (EV_P_ int fd, int revents)
124	{	415	{
125	ANFD *anfd = anfds + fd;	416	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	417	struct ev_io *w;
127		418
128	for (w = anfd->head; w; w = w->next)	419	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	420	{
130	int ev = w->events & events;	421	int ev = w->events & revents;
131		422
132	if (ev)	423	if (ev)
133	event ((struct ev_watcher *)w, ev);	424	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	{	425	}
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	}	426	}
159		427
160	static void	428	void
161	downheap (struct ev_timer **timers, int N, int k)	429	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	430	{
163	struct ev_timer *w = timers [k];	431	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	}	432	}
183		433
184	static struct ev_signal **signals;	434	/*****************************************************************************/
185	static int signalmax;
186		435
187	static void	436	inline void
188	signals_init (struct ev_signal **base, int count)	437	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	{	438	{
247	int i;	439	int i;
248		440
249	for (i = 0; i < fdchangecnt; ++i)	441	for (i = 0; i < fdchangecnt; ++i)
250	{	442	{
251	int fd = fdchanges [i];	443	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	444	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	445	struct ev_io *w;
254		446
255	int wev = 0;	447	int events = 0;
256		448
257	for (w = anfd->head; w; w = w->next)	449	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	450	events |= w->events;
259		451
260	if (anfd->wev != wev)	452	#if EV_SELECT_IS_WINSOCKET
		453	if (events)
261	{	454	{
262	method_modify (fd, anfd->wev, wev);	455	unsigned long argp;
263	anfd->wev = wev;	456	anfd->handle = _get_osfhandle (fd);
		457	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
264	}	458	}
		459	#endif
		460
		461	anfd->reify = 0;
		462
		463	backend_modify (EV_A_ fd, anfd->events, events);
		464	anfd->events = events;
265	}	465	}
266		466
267	fdchangecnt = 0;	467	fdchangecnt = 0;
268	}	468	}
269		469
270	static void	470	static void
271	call_pending ()	471	fd_change (EV_P_ int fd)
		472	{
		473	if (expect_false (anfds [fd].reify))
		474	return;
		475
		476	anfds [fd].reify = 1;
		477
		478	++fdchangecnt;
		479	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		480	fdchanges [fdchangecnt - 1] = fd;
		481	}
		482
		483	static void
		484	fd_kill (EV_P_ int fd)
		485	{
		486	struct ev_io *w;
		487
		488	while ((w = (struct ev_io *)anfds [fd].head))
		489	{
		490	ev_io_stop (EV_A_ w);
		491	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		492	}
		493	}
		494
		495	inline int
		496	fd_valid (int fd)
		497	{
		498	#ifdef _WIN32
		499	return _get_osfhandle (fd) != -1;
		500	#else
		501	return fcntl (fd, F_GETFD) != -1;
		502	#endif
		503	}
		504
		505	/* called on EBADF to verify fds */
		506	static void
		507	fd_ebadf (EV_P)
		508	{
		509	int fd;
		510
		511	for (fd = 0; fd < anfdmax; ++fd)
		512	if (anfds [fd].events)
		513	if (!fd_valid (fd) == -1 && errno == EBADF)
		514	fd_kill (EV_A_ fd);
		515	}
		516
		517	/* called on ENOMEM in select/poll to kill some fds and retry */
		518	static void
		519	fd_enomem (EV_P)
		520	{
		521	int fd;
		522
		523	for (fd = anfdmax; fd--; )
		524	if (anfds [fd].events)
		525	{
		526	fd_kill (EV_A_ fd);
		527	return;
		528	}
		529	}
		530
		531	/* usually called after fork if backend needs to re-arm all fds from scratch */
		532	static void
		533	fd_rearm_all (EV_P)
		534	{
		535	int fd;
		536
		537	/* this should be highly optimised to not do anything but set a flag */
		538	for (fd = 0; fd < anfdmax; ++fd)
		539	if (anfds [fd].events)
		540	{
		541	anfds [fd].events = 0;
		542	fd_change (EV_A_ fd);
		543	}
		544	}
		545
		546	/*****************************************************************************/
		547
		548	static void
		549	upheap (WT *heap, int k)
		550	{
		551	WT w = heap [k];
		552
		553	while (k && heap [k >> 1]->at > w->at)
		554	{
		555	heap [k] = heap [k >> 1];
		556	((W)heap [k])->active = k + 1;
		557	k >>= 1;
		558	}
		559
		560	heap [k] = w;
		561	((W)heap [k])->active = k + 1;
		562
		563	}
		564
		565	static void
		566	downheap (WT *heap, int N, int k)
		567	{
		568	WT w = heap [k];
		569
		570	while (k < (N >> 1))
		571	{
		572	int j = k << 1;
		573
		574	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		575	++j;
		576
		577	if (w->at <= heap [j]->at)
		578	break;
		579
		580	heap [k] = heap [j];
		581	((W)heap [k])->active = k + 1;
		582	k = j;
		583	}
		584
		585	heap [k] = w;
		586	((W)heap [k])->active = k + 1;
		587	}
		588
		589	inline void
		590	adjustheap (WT *heap, int N, int k)
		591	{
		592	upheap (heap, k);
		593	downheap (heap, N, k);
		594	}
		595
		596	/*****************************************************************************/
		597
		598	typedef struct
		599	{
		600	WL head;
		601	sig_atomic_t volatile gotsig;
		602	} ANSIG;
		603
		604	static ANSIG *signals;
		605	static int signalmax;
		606
		607	static int sigpipe [2];
		608	static sig_atomic_t volatile gotsig;
		609	static struct ev_io sigev;
		610
		611	static void
		612	signals_init (ANSIG *base, int count)
		613	{
		614	while (count--)
		615	{
		616	base->head = 0;
		617	base->gotsig = 0;
		618
		619	++base;
		620	}
		621	}
		622
		623	static void
		624	sighandler (int signum)
		625	{
		626	#if _WIN32
		627	signal (signum, sighandler);
		628	#endif
		629
		630	signals [signum - 1].gotsig = 1;
		631
		632	if (!gotsig)
		633	{
		634	int old_errno = errno;
		635	gotsig = 1;
		636	write (sigpipe [1], &signum, 1);
		637	errno = old_errno;
		638	}
		639	}
		640
		641	void
		642	ev_feed_signal_event (EV_P_ int signum)
		643	{
		644	WL w;
		645
		646	#if EV_MULTIPLICITY
		647	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		648	#endif
		649
		650	--signum;
		651
		652	if (signum < 0 || signum >= signalmax)
		653	return;
		654
		655	signals [signum].gotsig = 0;
		656
		657	for (w = signals [signum].head; w; w = w->next)
		658	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		659	}
		660
		661	static void
		662	sigcb (EV_P_ struct ev_io *iow, int revents)
		663	{
		664	int signum;
		665
		666	read (sigpipe [0], &revents, 1);
		667	gotsig = 0;
		668
		669	for (signum = signalmax; signum--; )
		670	if (signals [signum].gotsig)
		671	ev_feed_signal_event (EV_A_ signum + 1);
		672	}
		673
		674	static void
		675	fd_intern (int fd)
		676	{
		677	#ifdef _WIN32
		678	int arg = 1;
		679	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		680	#else
		681	fcntl (fd, F_SETFD, FD_CLOEXEC);
		682	fcntl (fd, F_SETFL, O_NONBLOCK);
		683	#endif
		684	}
		685
		686	static void
		687	siginit (EV_P)
		688	{
		689	fd_intern (sigpipe [0]);
		690	fd_intern (sigpipe [1]);
		691
		692	ev_io_set (&sigev, sigpipe [0], EV_READ);
		693	ev_io_start (EV_A_ &sigev);
		694	ev_unref (EV_A); /* child watcher should not keep loop alive */
		695	}
		696
		697	/*****************************************************************************/
		698
		699	static struct ev_child *childs [PID_HASHSIZE];
		700
		701	#ifndef _WIN32
		702
		703	static struct ev_signal childev;
		704
		705	#ifndef WCONTINUED
		706	# define WCONTINUED 0
		707	#endif
		708
		709	static void
		710	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		711	{
		712	struct ev_child *w;
		713
		714	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		715	if (w->pid == pid || !w->pid)
		716	{
		717	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		718	w->rpid = pid;
		719	w->rstatus = status;
		720	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		721	}
		722	}
		723
		724	static void
		725	childcb (EV_P_ struct ev_signal *sw, int revents)
		726	{
		727	int pid, status;
		728
		729	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		730	{
		731	/* make sure we are called again until all childs have been reaped */
		732	/* we need to do it this way so that the callback gets called before we continue */
		733	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		734
		735	child_reap (EV_A_ sw, pid, pid, status);
		736	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		737	}
		738	}
		739
		740	#endif
		741
		742	/*****************************************************************************/
		743
		744	#if EV_USE_PORT
		745	# include "ev_port.c"
		746	#endif
		747	#if EV_USE_KQUEUE
		748	# include "ev_kqueue.c"
		749	#endif
		750	#if EV_USE_EPOLL
		751	# include "ev_epoll.c"
		752	#endif
		753	#if EV_USE_POLL
		754	# include "ev_poll.c"
		755	#endif
		756	#if EV_USE_SELECT
		757	# include "ev_select.c"
		758	#endif
		759
		760	int
		761	ev_version_major (void)
		762	{
		763	return EV_VERSION_MAJOR;
		764	}
		765
		766	int
		767	ev_version_minor (void)
		768	{
		769	return EV_VERSION_MINOR;
		770	}
		771
		772	/* return true if we are running with elevated privileges and should ignore env variables */
		773	static int
		774	enable_secure (void)
		775	{
		776	#ifdef _WIN32
		777	return 0;
		778	#else
		779	return getuid () != geteuid ()
		780	|| getgid () != getegid ();
		781	#endif
		782	}
		783
		784	unsigned int
		785	ev_supported_backends (void)
		786	{
		787	unsigned int flags = 0;
		788
		789	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		790	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		791	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		792	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		793	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		794
		795	return flags;
		796	}
		797
		798	unsigned int
		799	ev_recommended_backends (void)
		800	{
		801	unsigned int flags = ev_supported_backends ();
		802
		803	#ifndef __NetBSD__
		804	/* kqueue is borked on everything but netbsd apparently */
		805	/* it usually doesn't work correctly on anything but sockets and pipes */
		806	flags &= ~EVBACKEND_KQUEUE;
		807	#endif
		808	#ifdef __APPLE__
		809	// flags &= ~EVBACKEND_KQUEUE; for documentation
		810	flags &= ~EVBACKEND_POLL;
		811	#endif
		812
		813	return flags;
		814	}
		815
		816	unsigned int
		817	ev_backend (EV_P)
		818	{
		819	return backend;
		820	}
		821
		822	static void
		823	loop_init (EV_P_ unsigned int flags)
		824	{
		825	if (!backend)
		826	{
		827	#if EV_USE_MONOTONIC
		828	{
		829	struct timespec ts;
		830	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		831	have_monotonic = 1;
		832	}
		833	#endif
		834
		835	ev_rt_now = ev_time ();
		836	mn_now = get_clock ();
		837	now_floor = mn_now;
		838	rtmn_diff = ev_rt_now - mn_now;
		839
		840	if (!(flags & EVFLAG_NOENV)
		841	&& !enable_secure ()
		842	&& getenv ("LIBEV_FLAGS"))
		843	flags = atoi (getenv ("LIBEV_FLAGS"));
		844
		845	if (!(flags & 0x0000ffffUL))
		846	flags |= ev_recommended_backends ();
		847
		848	backend = 0;
		849	#if EV_USE_PORT
		850	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		851	#endif
		852	#if EV_USE_KQUEUE
		853	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		854	#endif
		855	#if EV_USE_EPOLL
		856	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		857	#endif
		858	#if EV_USE_POLL
		859	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		860	#endif
		861	#if EV_USE_SELECT
		862	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		863	#endif
		864
		865	ev_init (&sigev, sigcb);
		866	ev_set_priority (&sigev, EV_MAXPRI);
		867	}
		868	}
		869
		870	static void
		871	loop_destroy (EV_P)
272	{	872	{
273	int i;	873	int i;
274		874
275	for (i = 0; i < pendingcnt; ++i)	875	#if EV_USE_PORT
		876	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		877	#endif
		878	#if EV_USE_KQUEUE
		879	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		880	#endif
		881	#if EV_USE_EPOLL
		882	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		883	#endif
		884	#if EV_USE_POLL
		885	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		886	#endif
		887	#if EV_USE_SELECT
		888	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		889	#endif
		890
		891	for (i = NUMPRI; i--; )
		892	array_free (pending, [i]);
		893
		894	/* have to use the microsoft-never-gets-it-right macro */
		895	array_free (fdchange, EMPTY0);
		896	array_free (timer, EMPTY0);
		897	#if EV_PERIODICS
		898	array_free (periodic, EMPTY0);
		899	#endif
		900	array_free (idle, EMPTY0);
		901	array_free (prepare, EMPTY0);
		902	array_free (check, EMPTY0);
		903
		904	backend = 0;
		905	}
		906
		907	static void
		908	loop_fork (EV_P)
		909	{
		910	#if EV_USE_PORT
		911	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		912	#endif
		913	#if EV_USE_KQUEUE
		914	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		915	#endif
		916	#if EV_USE_EPOLL
		917	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		918	#endif
		919
		920	if (ev_is_active (&sigev))
		921	{
		922	/* default loop */
		923
		924	ev_ref (EV_A);
		925	ev_io_stop (EV_A_ &sigev);
		926	close (sigpipe [0]);
		927	close (sigpipe [1]);
		928
		929	while (pipe (sigpipe))
		930	syserr ("(libev) error creating pipe");
		931
		932	siginit (EV_A);
276	{	933	}
277	ANPENDING *p = pendings + i;
278		934
279	if (p->w)	935	postfork = 0;
		936	}
		937
		938	#if EV_MULTIPLICITY
		939	struct ev_loop *
		940	ev_loop_new (unsigned int flags)
		941	{
		942	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		943
		944	memset (loop, 0, sizeof (struct ev_loop));
		945
		946	loop_init (EV_A_ flags);
		947
		948	if (ev_backend (EV_A))
		949	return loop;
		950
		951	return 0;
		952	}
		953
		954	void
		955	ev_loop_destroy (EV_P)
		956	{
		957	loop_destroy (EV_A);
		958	ev_free (loop);
		959	}
		960
		961	void
		962	ev_loop_fork (EV_P)
		963	{
		964	postfork = 1;
		965	}
		966
		967	#endif
		968
		969	#if EV_MULTIPLICITY
		970	struct ev_loop *
		971	ev_default_loop_init (unsigned int flags)
		972	#else
		973	int
		974	ev_default_loop (unsigned int flags)
		975	#endif
		976	{
		977	if (sigpipe [0] == sigpipe [1])
		978	if (pipe (sigpipe))
		979	return 0;
		980
		981	if (!ev_default_loop_ptr)
		982	{
		983	#if EV_MULTIPLICITY
		984	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		985	#else
		986	ev_default_loop_ptr = 1;
		987	#endif
		988
		989	loop_init (EV_A_ flags);
		990
		991	if (ev_backend (EV_A))
280	{	992	{
281	p->w->pending = 0;	993	siginit (EV_A);
282	p->w->cb (p->w, p->events);	994
		995	#ifndef _WIN32
		996	ev_signal_init (&childev, childcb, SIGCHLD);
		997	ev_set_priority (&childev, EV_MAXPRI);
		998	ev_signal_start (EV_A_ &childev);
		999	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1000	#endif
283	}	1001	}
		1002	else
		1003	ev_default_loop_ptr = 0;
		1004	}
		1005
		1006	return ev_default_loop_ptr;
		1007	}
		1008
		1009	void
		1010	ev_default_destroy (void)
		1011	{
		1012	#if EV_MULTIPLICITY
		1013	struct ev_loop *loop = ev_default_loop_ptr;
		1014	#endif
		1015
		1016	#ifndef _WIN32
		1017	ev_ref (EV_A); /* child watcher */
		1018	ev_signal_stop (EV_A_ &childev);
		1019	#endif
		1020
		1021	ev_ref (EV_A); /* signal watcher */
		1022	ev_io_stop (EV_A_ &sigev);
		1023
		1024	close (sigpipe [0]); sigpipe [0] = 0;
		1025	close (sigpipe [1]); sigpipe [1] = 0;
		1026
		1027	loop_destroy (EV_A);
		1028	}
		1029
		1030	void
		1031	ev_default_fork (void)
		1032	{
		1033	#if EV_MULTIPLICITY
		1034	struct ev_loop *loop = ev_default_loop_ptr;
		1035	#endif
		1036
		1037	if (backend)
		1038	postfork = 1;
		1039	}
		1040
		1041	/*****************************************************************************/
		1042
		1043	static int
		1044	any_pending (EV_P)
		1045	{
		1046	int pri;
		1047
		1048	for (pri = NUMPRI; pri--; )
		1049	if (pendingcnt [pri])
		1050	return 1;
		1051
		1052	return 0;
		1053	}
		1054
		1055	inline void
		1056	call_pending (EV_P)
		1057	{
		1058	int pri;
		1059
		1060	for (pri = NUMPRI; pri--; )
		1061	while (pendingcnt [pri])
		1062	{
		1063	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1064
		1065	if (expect_true (p->w))
		1066	{
		1067	p->w->pending = 0;
		1068	EV_CB_INVOKE (p->w, p->events);
		1069	}
284	}	1070	}
285
286	pendingcnt = 0;
287	}	1071	}
288		1072
289	static void	1073	inline void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1074	timers_reify (EV_P)
291	{	1075	{
292	while (timercnt && timers [0]->at <= now)	1076	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	1077	{
294	struct ev_timer *w = timers [0];	1078	struct ev_timer *w = timers [0];
		1079
		1080	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		1081
296	/* first reschedule or stop timer */	1082	/* first reschedule or stop timer */
297	if (w->repeat)	1083	if (w->repeat)
298	{	1084	{
299	if (w->is_abs)	1085	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;	1086
301	else
302	w->at = now + w->repeat;	1087	((WT)w)->at += w->repeat;
		1088	if (((WT)w)->at < mn_now)
		1089	((WT)w)->at = mn_now;
303		1090
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	1091	downheap ((WT *)timers, timercnt, 0);
307	}	1092	}
308	else	1093	else
		1094	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1095
		1096	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1097	}
		1098	}
		1099
		1100	#if EV_PERIODICS
		1101	inline void
		1102	periodics_reify (EV_P)
		1103	{
		1104	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1105	{
		1106	struct ev_periodic *w = periodics [0];
		1107
		1108	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1109
		1110	/* first reschedule or stop timer */
		1111	if (w->reschedule_cb)
309	{	1112	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1113	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	1114	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1115	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1116	}
		1117	else if (w->interval)
		1118	{
		1119	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1120	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1121	downheap ((WT *)periodics, periodiccnt, 0);
		1122	}
		1123	else
		1124	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1125
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1126	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1127	}
316	}	1128	}
317		1129
318	static void	1130	static void
319	time_update ()	1131	periodics_reschedule (EV_P)
320	{	1132	{
321	int i;	1133	int i;
		1134
		1135	/* adjust periodics after time jump */
		1136	for (i = 0; i < periodiccnt; ++i)
		1137	{
		1138	struct ev_periodic *w = periodics [i];
		1139
		1140	if (w->reschedule_cb)
		1141	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1142	else if (w->interval)
		1143	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1144	}
		1145
		1146	/* now rebuild the heap */
		1147	for (i = periodiccnt >> 1; i--; )
		1148	downheap ((WT *)periodics, periodiccnt, i);
		1149	}
		1150	#endif
		1151
		1152	inline int
		1153	time_update_monotonic (EV_P)
		1154	{
		1155	mn_now = get_clock ();
		1156
		1157	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1158	{
		1159	ev_rt_now = rtmn_diff + mn_now;
		1160	return 0;
		1161	}
		1162	else
		1163	{
		1164	now_floor = mn_now;
322	ev_now = ev_time ();	1165	ev_rt_now = ev_time ();
323		1166	return 1;
324	if (have_monotonic)
325	{	1167	}
326	ev_tstamp odiff = diff;	1168	}
327		1169
328	/* detecting time jumps is much more difficult */	1170	inline void
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1171	time_update (EV_P)
		1172	{
		1173	int i;
		1174
		1175	#if EV_USE_MONOTONIC
		1176	if (expect_true (have_monotonic))
		1177	{
		1178	if (time_update_monotonic (EV_A))
330	{	1179	{
331	now = get_clock ();	1180	ev_tstamp odiff = rtmn_diff;
		1181
		1182	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1183	{
332	diff = ev_now - now;	1184	rtmn_diff = ev_rt_now - mn_now;
333		1185
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1186	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1187	return; /* all is well */
336		1188
337	ev_now = ev_time ();	1189	ev_rt_now = ev_time ();
		1190	mn_now = get_clock ();
		1191	now_floor = mn_now;
		1192	}
		1193
		1194	# if EV_PERIODICS
		1195	periodics_reschedule (EV_A);
		1196	# endif
		1197	/* no timer adjustment, as the monotonic clock doesn't jump */
		1198	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1199	}
		1200	}
		1201	else
		1202	#endif
		1203	{
		1204	ev_rt_now = ev_time ();
339		1205
340	/* time jump detected, reschedule atimers */	1206	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	{	1207	{
343	struct ev_timer *w = atimers [i];	1208	#if EV_PERIODICS
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1209	periodics_reschedule (EV_A);
		1210	#endif
		1211
		1212	/* adjust timers. this is easy, as the offset is the same for all */
		1213	for (i = 0; i < timercnt; ++i)
		1214	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1215	}
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		1216
354	now = ev_now;	1217	mn_now = ev_rt_now;
355	}	1218	}
356	}	1219	}
357		1220
358	int ev_loop_done;	1221	void
		1222	ev_ref (EV_P)
		1223	{
		1224	++activecnt;
		1225	}
359		1226
		1227	void
		1228	ev_unref (EV_P)
		1229	{
		1230	--activecnt;
		1231	}
		1232
		1233	static int loop_done;
		1234
		1235	void
360	void ev_loop (int flags)	1236	ev_loop (EV_P_ int flags)
361	{	1237	{
362	double block;	1238	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1239	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1240
365	do	1241	while (activecnt)
366	{	1242	{
		1243	/* queue check watchers (and execute them) */
		1244	if (expect_false (preparecnt))
		1245	{
		1246	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1247	call_pending (EV_A);
		1248	}
		1249
		1250	/* we might have forked, so reify kernel state if necessary */
		1251	if (expect_false (postfork))
		1252	loop_fork (EV_A);
		1253
367	/* update fd-related kernel structures */	1254	/* update fd-related kernel structures */
368	fd_reify ();	1255	fd_reify (EV_A);
369		1256
370	/* calculate blocking time */	1257	/* calculate blocking time */
		1258
		1259	/* we only need this for !monotonic clock or timers, but as we basically
		1260	always have timers, we just calculate it always */
		1261	#if EV_USE_MONOTONIC
		1262	if (expect_true (have_monotonic))
		1263	time_update_monotonic (EV_A);
		1264	else
		1265	#endif
		1266	{
		1267	ev_rt_now = ev_time ();
		1268	mn_now = ev_rt_now;
		1269	}
		1270
371	if (flags & EVLOOP_NONBLOCK)	1271	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1272	block = 0.;
373	else	1273	else
374	{	1274	{
375	block = MAX_BLOCKTIME;	1275	block = MAX_BLOCKTIME;
376		1276
377	if (rtimercnt)	1277	if (timercnt)
378	{	1278	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1279	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
380	if (block > to) block = to;	1280	if (block > to) block = to;
381	}	1281	}
382		1282
		1283	#if EV_PERIODICS
383	if (atimercnt)	1284	if (periodiccnt)
384	{	1285	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1286	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
386	if (block > to) block = to;	1287	if (block > to) block = to;
387	}	1288	}
		1289	#endif
388		1290
389	if (block < 0.) block = 0.;	1291	if (expect_false (block < 0.)) block = 0.;
390	}	1292	}
391		1293
392	method_poll (block);	1294	backend_poll (EV_A_ block);
393		1295
394	/* update ev_now, do magic */	1296	/* update ev_rt_now, do magic */
395	time_update ();	1297	time_update (EV_A);
396		1298
397	/* put pending timers into pendign queue and reschedule them */	1299	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1300	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1301	#if EV_PERIODICS
400	/* relative timers second */	1302	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1303	#endif
402		1304
		1305	/* queue idle watchers unless io or timers are pending */
		1306	if (idlecnt && !any_pending (EV_A))
		1307	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1308
		1309	/* queue check watchers, to be executed first */
		1310	if (expect_false (checkcnt))
		1311	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1312
403	call_pending ();	1313	call_pending (EV_A);
404	}
405	while (!ev_loop_done);
406	}
407		1314
408	static void	1315	if (expect_false (loop_done))
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1316	break;
		1317	}
		1318
		1319	if (loop_done != 2)
		1320	loop_done = 0;
		1321	}
		1322
		1323	void
		1324	ev_unloop (EV_P_ int how)
		1325	{
		1326	loop_done = how;
		1327	}
		1328
		1329	/*****************************************************************************/
		1330
		1331	inline void
		1332	wlist_add (WL *head, WL elem)
410	{	1333	{
411	elem->next = *head;	1334	elem->next = *head;
412	*head = elem;	1335	*head = elem;
413	}	1336	}
414		1337
415	static void	1338	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1339	wlist_del (WL *head, WL elem)
417	{	1340	{
418	while (*head)	1341	while (*head)
419	{	1342	{
420	if (*head == elem)	1343	if (*head == elem)
421	{	1344	{
…		…
425		1348
426	head = &(*head)->next;	1349	head = &(*head)->next;
427	}	1350	}
428	}	1351	}
429		1352
430	static void	1353	inline void
431	ev_start (struct ev_watcher *w, int active)	1354	ev_clear_pending (EV_P_ W w)
432	{	1355	{
		1356	if (w->pending)
		1357	{
		1358	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1359	w->pending = 0;
		1360	}
		1361	}
		1362
		1363	inline void
		1364	ev_start (EV_P_ W w, int active)
		1365	{
		1366	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1367	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1368
434	w->active = active;	1369	w->active = active;
		1370	ev_ref (EV_A);
435	}	1371	}
436		1372
437	static void	1373	inline void
438	ev_stop (struct ev_watcher *w)	1374	ev_stop (EV_P_ W w)
439	{	1375	{
440	if (w->pending)	1376	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1377	w->active = 0;
444	/* nop */
445	}	1378	}
446		1379
		1380	/*****************************************************************************/
		1381
447	void	1382	void
448	evio_start (struct ev_io *w)	1383	ev_io_start (EV_P_ struct ev_io *w)
		1384	{
		1385	int fd = w->fd;
		1386
		1387	if (expect_false (ev_is_active (w)))
		1388	return;
		1389
		1390	assert (("ev_io_start called with negative fd", fd >= 0));
		1391
		1392	ev_start (EV_A_ (W)w, 1);
		1393	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1394	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1395
		1396	fd_change (EV_A_ fd);
		1397	}
		1398
		1399	void
		1400	ev_io_stop (EV_P_ struct ev_io *w)
		1401	{
		1402	ev_clear_pending (EV_A_ (W)w);
		1403	if (expect_false (!ev_is_active (w)))
		1404	return;
		1405
		1406	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1407
		1408	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1409	ev_stop (EV_A_ (W)w);
		1410
		1411	fd_change (EV_A_ w->fd);
		1412	}
		1413
		1414	void
		1415	ev_timer_start (EV_P_ struct ev_timer *w)
		1416	{
		1417	if (expect_false (ev_is_active (w)))
		1418	return;
		1419
		1420	((WT)w)->at += mn_now;
		1421
		1422	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1423
		1424	ev_start (EV_A_ (W)w, ++timercnt);
		1425	array_needsize (struct ev_timer *, timers, timermax, timercnt, EMPTY2);
		1426	timers [timercnt - 1] = w;
		1427	upheap ((WT *)timers, timercnt - 1);
		1428
		1429	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1430	}
		1431
		1432	void
		1433	ev_timer_stop (EV_P_ struct ev_timer *w)
		1434	{
		1435	ev_clear_pending (EV_A_ (W)w);
		1436	if (expect_false (!ev_is_active (w)))
		1437	return;
		1438
		1439	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1440
		1441	if (expect_true (((W)w)->active < timercnt--))
		1442	{
		1443	timers [((W)w)->active - 1] = timers [timercnt];
		1444	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1445	}
		1446
		1447	((WT)w)->at -= mn_now;
		1448
		1449	ev_stop (EV_A_ (W)w);
		1450	}
		1451
		1452	void
		1453	ev_timer_again (EV_P_ struct ev_timer *w)
449	{	1454	{
450	if (ev_is_active (w))	1455	if (ev_is_active (w))
		1456	{
		1457	if (w->repeat)
		1458	{
		1459	((WT)w)->at = mn_now + w->repeat;
		1460	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1461	}
		1462	else
		1463	ev_timer_stop (EV_A_ w);
		1464	}
		1465	else if (w->repeat)
		1466	{
		1467	w->at = w->repeat;
		1468	ev_timer_start (EV_A_ w);
		1469	}
		1470	}
		1471
		1472	#if EV_PERIODICS
		1473	void
		1474	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1475	{
		1476	if (expect_false (ev_is_active (w)))
451	return;	1477	return;
452		1478
453	int fd = w->fd;	1479	if (w->reschedule_cb)
		1480	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1481	else if (w->interval)
		1482	{
		1483	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1484	/* this formula differs from the one in periodic_reify because we do not always round up */
		1485	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1486	}
454		1487
455	ev_start ((struct ev_watcher *)w, 1);	1488	ev_start (EV_A_ (W)w, ++periodiccnt);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1489	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1490	periodics [periodiccnt - 1] = w;
		1491	upheap ((WT *)periodics, periodiccnt - 1);
458		1492
459	++fdchangecnt;	1493	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1494	}
463		1495
464	void	1496	void
465	evio_stop (struct ev_io *w)	1497	ev_periodic_stop (EV_P_ struct ev_periodic *w)
466	{	1498	{
		1499	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1500	if (expect_false (!ev_is_active (w)))
468	return;	1501	return;
469		1502
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1503	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
471	ev_stop ((struct ev_watcher *)w);
472		1504
473	++fdchangecnt;	1505	if (expect_true (((W)w)->active < periodiccnt--))
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1506	{
475	fdchanges [fdchangecnt - 1] = w->fd;	1507	periodics [((W)w)->active - 1] = periodics [periodiccnt];
476	}	1508	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1509	}
477		1510
		1511	ev_stop (EV_A_ (W)w);
		1512	}
		1513
478	void	1514	void
		1515	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1516	{
		1517	/* TODO: use adjustheap and recalculation */
		1518	ev_periodic_stop (EV_A_ w);
		1519	ev_periodic_start (EV_A_ w);
		1520	}
		1521	#endif
		1522
		1523	void
479	evtimer_start (struct ev_timer *w)	1524	ev_idle_start (EV_P_ struct ev_idle *w)
480	{	1525	{
481	if (ev_is_active (w))	1526	if (expect_false (ev_is_active (w)))
482	return;	1527	return;
483		1528
484	if (w->is_abs)	1529	ev_start (EV_A_ (W)w, ++idlecnt);
485	{	1530	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 */	1531	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	}	1532	}
506		1533
507	void	1534	void
508	evtimer_stop (struct ev_timer *w)	1535	ev_idle_stop (EV_P_ struct ev_idle *w)
509	{	1536	{
		1537	ev_clear_pending (EV_A_ (W)w);
510	if (!ev_is_active (w))	1538	if (expect_false (!ev_is_active (w)))
511	return;	1539	return;
512		1540
513	if (w->is_abs)	1541	idles [((W)w)->active - 1] = idles [--idlecnt];
514	{	1542	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	}	1543	}
532		1544
533	void	1545	void
534	evsignal_start (struct ev_signal *w)	1546	ev_prepare_start (EV_P_ struct ev_prepare *w)
535	{	1547	{
536	if (ev_is_active (w))	1548	if (expect_false (ev_is_active (w)))
537	return;	1549	return;
538		1550
539	ev_start ((struct ev_watcher *)w, 1);	1551	ev_start (EV_A_ (W)w, ++preparecnt);
540	array_needsize (signals, signalmax, w->signum, signals_init);	1552	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);	1553	prepares [preparecnt - 1] = w;
542	}	1554	}
543		1555
544	void	1556	void
545	evsignal_stop (struct ev_signal *w)	1557	ev_prepare_stop (EV_P_ struct ev_prepare *w)
546	{	1558	{
		1559	ev_clear_pending (EV_A_ (W)w);
547	if (!ev_is_active (w))	1560	if (expect_false (!ev_is_active (w)))
548	return;	1561	return;
549		1562
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);	1563	prepares [((W)w)->active - 1] = prepares [--preparecnt];
551	ev_stop ((struct ev_watcher *)w);	1564	ev_stop (EV_A_ (W)w);
		1565	}
		1566
		1567	void
		1568	ev_check_start (EV_P_ struct ev_check *w)
		1569	{
		1570	if (expect_false (ev_is_active (w)))
		1571	return;
		1572
		1573	ev_start (EV_A_ (W)w, ++checkcnt);
		1574	array_needsize (struct ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1575	checks [checkcnt - 1] = w;
		1576	}
		1577
		1578	void
		1579	ev_check_stop (EV_P_ struct ev_check *w)
		1580	{
		1581	ev_clear_pending (EV_A_ (W)w);
		1582	if (expect_false (!ev_is_active (w)))
		1583	return;
		1584
		1585	checks [((W)w)->active - 1] = checks [--checkcnt];
		1586	ev_stop (EV_A_ (W)w);
		1587	}
		1588
		1589	#ifndef SA_RESTART
		1590	# define SA_RESTART 0
		1591	#endif
		1592
		1593	void
		1594	ev_signal_start (EV_P_ struct ev_signal *w)
		1595	{
		1596	#if EV_MULTIPLICITY
		1597	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1598	#endif
		1599	if (expect_false (ev_is_active (w)))
		1600	return;
		1601
		1602	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1603
		1604	ev_start (EV_A_ (W)w, 1);
		1605	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1606	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1607
		1608	if (!((WL)w)->next)
		1609	{
		1610	#if _WIN32
		1611	signal (w->signum, sighandler);
		1612	#else
		1613	struct sigaction sa;
		1614	sa.sa_handler = sighandler;
		1615	sigfillset (&sa.sa_mask);
		1616	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1617	sigaction (w->signum, &sa, 0);
		1618	#endif
		1619	}
		1620	}
		1621
		1622	void
		1623	ev_signal_stop (EV_P_ struct ev_signal *w)
		1624	{
		1625	ev_clear_pending (EV_A_ (W)w);
		1626	if (expect_false (!ev_is_active (w)))
		1627	return;
		1628
		1629	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1630	ev_stop (EV_A_ (W)w);
		1631
		1632	if (!signals [w->signum - 1].head)
		1633	signal (w->signum, SIG_DFL);
		1634	}
		1635
		1636	void
		1637	ev_child_start (EV_P_ struct ev_child *w)
		1638	{
		1639	#if EV_MULTIPLICITY
		1640	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1641	#endif
		1642	if (expect_false (ev_is_active (w)))
		1643	return;
		1644
		1645	ev_start (EV_A_ (W)w, 1);
		1646	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1647	}
		1648
		1649	void
		1650	ev_child_stop (EV_P_ struct ev_child *w)
		1651	{
		1652	ev_clear_pending (EV_A_ (W)w);
		1653	if (expect_false (!ev_is_active (w)))
		1654	return;
		1655
		1656	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1657	ev_stop (EV_A_ (W)w);
552	}	1658	}
553		1659
554	/*****************************************************************************/	1660	/*****************************************************************************/
555	#if 1
556		1661
557	static void	1662	struct ev_once
558	sin_cb (struct ev_io *w, int revents)
559	{	1663	{
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;	1664	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;	1665	struct ev_timer to;
597	evw_init (&t1, ocb, 0);	1666	void (*cb)(int revents, void *arg);
598	evtimer_set_abs (&t1, 5, 10);	1667	void *arg;
599	evtimer_start (&t1);	1668	};
600		1669
601	ev_loop (0);	1670	static void
		1671	once_cb (EV_P_ struct ev_once *once, int revents)
		1672	{
		1673	void (*cb)(int revents, void *arg) = once->cb;
		1674	void *arg = once->arg;
602		1675
		1676	ev_io_stop (EV_A_ &once->io);
		1677	ev_timer_stop (EV_A_ &once->to);
		1678	ev_free (once);
		1679
		1680	cb (revents, arg);
		1681	}
		1682
		1683	static void
		1684	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1685	{
		1686	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1687	}
		1688
		1689	static void
		1690	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1691	{
		1692	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1693	}
		1694
		1695	void
		1696	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1697	{
		1698	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1699
		1700	if (expect_false (!once))
		1701	{
		1702	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
603	return 0;	1703	return;
604	}	1704	}
605		1705
606	#endif	1706	once->cb = cb;
		1707	once->arg = arg;
607		1708
		1709	ev_init (&once->io, once_cb_io);
		1710	if (fd >= 0)
		1711	{
		1712	ev_io_set (&once->io, fd, events);
		1713	ev_io_start (EV_A_ &once->io);
		1714	}
608		1715
		1716	ev_init (&once->to, once_cb_to);
		1717	if (timeout >= 0.)
		1718	{
		1719	ev_timer_set (&once->to, timeout, 0.);
		1720	ev_timer_start (EV_A_ &once->to);
		1721	}
		1722	}
609		1723
		1724	#ifdef __cplusplus
		1725	}
		1726	#endif
610		1727

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