ViewVC Help

View File | Revision Log | Show Annotations | Download File

/cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.86 by root, Sat Nov 10 03:19:21 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	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
		59	#include <fcntl.h>
		60	#include <stddef.h>
3		61
4	#include <stdio.h>	62	#include <stdio.h>
5		63
6	#include <assert.h>	64	#include <assert.h>
7	#include <errno.h>	65	#include <errno.h>
8	#include <sys/time.h>	66	#include <sys/types.h>
9	#include <time.h>	67	#include <time.h>
10		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
11	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
13	#endif	117	#endif
14		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	122	#endif
17	#define HAVE_SELECT 1	123
		124	/**/
18		125
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
22	#include "ev.h"	134	# include "ev.h"
		135	#endif
23		136
		137	#if __GNUC__ >= 3
		138	# define expect(expr,value) __builtin_expect ((expr),(value))
		139	# define inline inline
		140	#else
		141	# define expect(expr,value) (expr)
		142	# define inline static
		143	#endif
		144
		145	#define expect_false(expr) expect ((expr) != 0, 0)
		146	#define expect_true(expr) expect ((expr) != 0, 1)
		147
		148	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		149	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		150
24	struct ev_watcher {	151	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	152	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	153	typedef struct ev_watcher_time *WT;
30	};
31		154
32	static ev_tstamp now, diff; /* monotonic clock */	155	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		156
		157	#include "ev_win32.c"
		158
		159	/*****************************************************************************/
		160
		161	static void (*syserr_cb)(const char *msg);
		162
		163	void ev_set_syserr_cb (void (*cb)(const char *msg))
		164	{
		165	syserr_cb = cb;
		166	}
		167
		168	static void
		169	syserr (const char *msg)
		170	{
		171	if (!msg)
		172	msg = "(libev) system error";
		173
		174	if (syserr_cb)
		175	syserr_cb (msg);
		176	else
		177	{
		178	perror (msg);
		179	abort ();
		180	}
		181	}
		182
		183	static void *(*alloc)(void *ptr, long size);
		184
		185	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		186	{
		187	alloc = cb;
		188	}
		189
		190	static void *
		191	ev_realloc (void *ptr, long size)
		192	{
		193	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		194
		195	if (!ptr && size)
		196	{
		197	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		198	abort ();
		199	}
		200
		201	return ptr;
		202	}
		203
		204	#define ev_malloc(size) ev_realloc (0, (size))
		205	#define ev_free(ptr) ev_realloc ((ptr), 0)
		206
		207	/*****************************************************************************/
		208
		209	typedef struct
		210	{
		211	WL head;
		212	unsigned char events;
		213	unsigned char reify;
		214	} ANFD;
		215
		216	typedef struct
		217	{
		218	W w;
		219	int events;
		220	} ANPENDING;
		221
		222	#if EV_MULTIPLICITY
		223
		224	struct ev_loop
		225	{
		226	ev_tstamp ev_rt_now;
		227	#define VAR(name,decl) decl;
		228	#include "ev_vars.h"
		229	#undef VAR
		230	};
		231	#include "ev_wrap.h"
		232
		233	struct ev_loop default_loop_struct;
		234	static struct ev_loop *default_loop;
		235
		236	#else
		237
33	ev_tstamp ev_now;	238	ev_tstamp ev_rt_now;
34	int ev_method;	239	#define VAR(name,decl) static decl;
		240	#include "ev_vars.h"
		241	#undef VAR
35		242
36	static int have_monotonic; /* runtime */	243	static int default_loop;
37		244
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	245	#endif
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		246
42	ev_tstamp	247	/*****************************************************************************/
		248
		249	inline ev_tstamp
43	ev_time (void)	250	ev_time (void)
44	{	251	{
45	#if HAVE_REALTIME	252	#if EV_USE_REALTIME
46	struct timespec ts;	253	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	254	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	255	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	256	#else
50	struct timeval tv;	257	struct timeval tv;
51	gettimeofday (&tv, 0);	258	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	259	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	260	#endif
54	}	261	}
55		262
56	static ev_tstamp	263	inline ev_tstamp
57	get_clock (void)	264	get_clock (void)
58	{	265	{
59	#if HAVE_MONOTONIC	266	#if EV_USE_MONOTONIC
60	if (have_monotonic)	267	if (expect_true (have_monotonic))
61	{	268	{
62	struct timespec ts;	269	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	270	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	271	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	272	}
66	#endif	273	#endif
67		274
68	return ev_time ();	275	return ev_time ();
69	}	276	}
70		277
		278	#if EV_MULTIPLICITY
		279	ev_tstamp
		280	ev_now (EV_P)
		281	{
		282	return ev_rt_now;
		283	}
		284	#endif
		285
		286	#define array_roundsize(type,n) ((n) | 4 & ~3)
		287
71	#define array_needsize(base,cur,cnt,init) \	288	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	289	if (expect_false ((cnt) > cur)) \
73	{ \	290	{ \
74	int newcnt = cur ? cur << 1 : 16; \	291	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	292	do \
		293	{ \
		294	newcnt = array_roundsize (type, newcnt << 1); \
		295	} \
		296	while ((cnt) > newcnt); \
		297	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	298	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	299	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	300	cur = newcnt; \
79	}	301	}
80		302
81	typedef struct	303	#define array_slim(type,stem) \
82	{	304	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	305	{ \
84	unsigned char wev, rev; /* want, received event set */	306	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	307	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		308	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		309	}
86		310
87	static ANFD *anfds;	311	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
88	static int anfdmax;	312	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		313	#define array_free_microshit(stem) \
		314	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
89		315
90	static int *fdchanges;	316	#define array_free(stem, idx) \
91	static int fdchangemax, fdchangecnt;	317	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		318
		319	/*****************************************************************************/
92		320
93	static void	321	static void
94	anfds_init (ANFD *base, int count)	322	anfds_init (ANFD *base, int count)
95	{	323	{
96	while (count--)	324	while (count--)
97	{	325	{
98	base->head = 0;	326	base->head = 0;
99	base->wev = base->rev = EV_NONE;	327	base->events = EV_NONE;
		328	base->reify = 0;
		329
100	++base;	330	++base;
101	}	331	}
102	}	332	}
103		333
104	typedef struct	334	void
		335	ev_feed_event (EV_P_ void *w, int revents)
105	{	336	{
106	struct ev_watcher *w;	337	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		338
110	static ANPENDING *pendings;	339	if (w_->pending)
111	static int pendingmax, pendingcnt;	340	{
		341	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		342	return;
		343	}
112		344
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	345	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	346	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
118	pendings [pendingcnt - 1].w = w;	347	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	348	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	349	}
121		350
122	static void	351	static void
		352	queue_events (EV_P_ W *events, int eventcnt, int type)
		353	{
		354	int i;
		355
		356	for (i = 0; i < eventcnt; ++i)
		357	ev_feed_event (EV_A_ events [i], type);
		358	}
		359
		360	inline void
123	fd_event (int fd, int events)	361	fd_event (EV_P_ int fd, int revents)
124	{	362	{
125	ANFD *anfd = anfds + fd;	363	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	364	struct ev_io *w;
127		365
128	for (w = anfd->head; w; w = w->next)	366	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	367	{
130	int ev = w->events & events;	368	int ev = w->events & revents;
131		369
132	if (ev)	370	if (ev)
133	event ((struct ev_watcher *)w, ev);	371	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	{	372	}
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	}	373	}
159		374
160	static void	375	void
161	downheap (struct ev_timer **timers, int N, int k)	376	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	377	{
163	struct ev_timer *w = timers [k];	378	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	}	379	}
183		380
184	static struct ev_signal **signals;	381	/*****************************************************************************/
185	static int signalmax;
186		382
187	static void	383	static void
188	signals_init (struct ev_signal **base, int count)	384	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	{	385	{
247	int i;	386	int i;
248		387
249	for (i = 0; i < fdchangecnt; ++i)	388	for (i = 0; i < fdchangecnt; ++i)
250	{	389	{
251	int fd = fdchanges [i];	390	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	391	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	392	struct ev_io *w;
254		393
255	int wev = 0;	394	int events = 0;
256		395
257	for (w = anfd->head; w; w = w->next)	396	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	397	events |= w->events;
259		398
260	if (anfd->wev != wev)	399	anfd->reify = 0;
		400
		401	method_modify (EV_A_ fd, anfd->events, events);
		402	anfd->events = events;
		403	}
		404
		405	fdchangecnt = 0;
		406	}
		407
		408	static void
		409	fd_change (EV_P_ int fd)
		410	{
		411	if (anfds [fd].reify)
		412	return;
		413
		414	anfds [fd].reify = 1;
		415
		416	++fdchangecnt;
		417	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		418	fdchanges [fdchangecnt - 1] = fd;
		419	}
		420
		421	static void
		422	fd_kill (EV_P_ int fd)
		423	{
		424	struct ev_io *w;
		425
		426	while ((w = (struct ev_io *)anfds [fd].head))
		427	{
		428	ev_io_stop (EV_A_ w);
		429	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		430	}
		431	}
		432
		433	static int
		434	fd_valid (int fd)
		435	{
		436	#ifdef WIN32
		437	return !!win32_get_osfhandle (fd);
		438	#else
		439	return fcntl (fd, F_GETFD) != -1;
		440	#endif
		441	}
		442
		443	/* called on EBADF to verify fds */
		444	static void
		445	fd_ebadf (EV_P)
		446	{
		447	int fd;
		448
		449	for (fd = 0; fd < anfdmax; ++fd)
		450	if (anfds [fd].events)
		451	if (!fd_valid (fd) == -1 && errno == EBADF)
		452	fd_kill (EV_A_ fd);
		453	}
		454
		455	/* called on ENOMEM in select/poll to kill some fds and retry */
		456	static void
		457	fd_enomem (EV_P)
		458	{
		459	int fd;
		460
		461	for (fd = anfdmax; fd--; )
		462	if (anfds [fd].events)
		463	{
		464	fd_kill (EV_A_ fd);
		465	return;
		466	}
		467	}
		468
		469	/* usually called after fork if method needs to re-arm all fds from scratch */
		470	static void
		471	fd_rearm_all (EV_P)
		472	{
		473	int fd;
		474
		475	/* this should be highly optimised to not do anything but set a flag */
		476	for (fd = 0; fd < anfdmax; ++fd)
		477	if (anfds [fd].events)
		478	{
		479	anfds [fd].events = 0;
		480	fd_change (EV_A_ fd);
		481	}
		482	}
		483
		484	/*****************************************************************************/
		485
		486	static void
		487	upheap (WT *heap, int k)
		488	{
		489	WT w = heap [k];
		490
		491	while (k && heap [k >> 1]->at > w->at)
		492	{
		493	heap [k] = heap [k >> 1];
		494	((W)heap [k])->active = k + 1;
		495	k >>= 1;
		496	}
		497
		498	heap [k] = w;
		499	((W)heap [k])->active = k + 1;
		500
		501	}
		502
		503	static void
		504	downheap (WT *heap, int N, int k)
		505	{
		506	WT w = heap [k];
		507
		508	while (k < (N >> 1))
		509	{
		510	int j = k << 1;
		511
		512	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		513	++j;
		514
		515	if (w->at <= heap [j]->at)
		516	break;
		517
		518	heap [k] = heap [j];
		519	((W)heap [k])->active = k + 1;
		520	k = j;
		521	}
		522
		523	heap [k] = w;
		524	((W)heap [k])->active = k + 1;
		525	}
		526
		527	inline void
		528	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		529	{
		530	ev_tstamp old_at = heap [k]->at;
		531	heap [k]->at = at;
		532
		533	if (old_at < at)
		534	downheap (heap, N, k);
		535	else
		536	upheap (heap, k);
		537	}
		538
		539	/*****************************************************************************/
		540
		541	typedef struct
		542	{
		543	WL head;
		544	sig_atomic_t volatile gotsig;
		545	} ANSIG;
		546
		547	static ANSIG *signals;
		548	static int signalmax;
		549
		550	static int sigpipe [2];
		551	static sig_atomic_t volatile gotsig;
		552	static struct ev_io sigev;
		553
		554	static void
		555	signals_init (ANSIG *base, int count)
		556	{
		557	while (count--)
		558	{
		559	base->head = 0;
		560	base->gotsig = 0;
		561
		562	++base;
		563	}
		564	}
		565
		566	static void
		567	sighandler (int signum)
		568	{
		569	#if WIN32
		570	signal (signum, sighandler);
		571	#endif
		572
		573	signals [signum - 1].gotsig = 1;
		574
		575	if (!gotsig)
		576	{
		577	int old_errno = errno;
		578	gotsig = 1;
		579	#ifdef WIN32
		580	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		581	#else
		582	write (sigpipe [1], &signum, 1);
		583	#endif
		584	errno = old_errno;
		585	}
		586	}
		587
		588	void
		589	ev_feed_signal_event (EV_P_ int signum)
		590	{
		591	WL w;
		592
		593	#if EV_MULTIPLICITY
		594	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		595	#endif
		596
		597	--signum;
		598
		599	if (signum < 0 || signum >= signalmax)
		600	return;
		601
		602	signals [signum].gotsig = 0;
		603
		604	for (w = signals [signum].head; w; w = w->next)
		605	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		606	}
		607
		608	static void
		609	sigcb (EV_P_ struct ev_io *iow, int revents)
		610	{
		611	int signum;
		612
		613	#ifdef WIN32
		614	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		615	#else
		616	read (sigpipe [0], &revents, 1);
		617	#endif
		618	gotsig = 0;
		619
		620	for (signum = signalmax; signum--; )
		621	if (signals [signum].gotsig)
		622	ev_feed_signal_event (EV_A_ signum + 1);
		623	}
		624
		625	static void
		626	siginit (EV_P)
		627	{
		628	#ifndef WIN32
		629	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		630	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		631
		632	/* rather than sort out wether we really need nb, set it */
		633	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		634	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		635	#endif
		636
		637	ev_io_set (&sigev, sigpipe [0], EV_READ);
		638	ev_io_start (EV_A_ &sigev);
		639	ev_unref (EV_A); /* child watcher should not keep loop alive */
		640	}
		641
		642	/*****************************************************************************/
		643
		644	static struct ev_child *childs [PID_HASHSIZE];
		645
		646	#ifndef WIN32
		647
		648	static struct ev_signal childev;
		649
		650	#ifndef WCONTINUED
		651	# define WCONTINUED 0
		652	#endif
		653
		654	static void
		655	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		656	{
		657	struct ev_child *w;
		658
		659	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		660	if (w->pid == pid || !w->pid)
		661	{
		662	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		663	w->rpid = pid;
		664	w->rstatus = status;
		665	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		666	}
		667	}
		668
		669	static void
		670	childcb (EV_P_ struct ev_signal *sw, int revents)
		671	{
		672	int pid, status;
		673
		674	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		675	{
		676	/* make sure we are called again until all childs have been reaped */
		677	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		678
		679	child_reap (EV_A_ sw, pid, pid, status);
		680	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		681	}
		682	}
		683
		684	#endif
		685
		686	/*****************************************************************************/
		687
		688	#if EV_USE_KQUEUE
		689	# include "ev_kqueue.c"
		690	#endif
		691	#if EV_USE_EPOLL
		692	# include "ev_epoll.c"
		693	#endif
		694	#if EV_USE_POLL
		695	# include "ev_poll.c"
		696	#endif
		697	#if EV_USE_SELECT
		698	# include "ev_select.c"
		699	#endif
		700
		701	int
		702	ev_version_major (void)
		703	{
		704	return EV_VERSION_MAJOR;
		705	}
		706
		707	int
		708	ev_version_minor (void)
		709	{
		710	return EV_VERSION_MINOR;
		711	}
		712
		713	/* return true if we are running with elevated privileges and should ignore env variables */
		714	static int
		715	enable_secure (void)
		716	{
		717	#ifdef WIN32
		718	return 0;
		719	#else
		720	return getuid () != geteuid ()
		721	|| getgid () != getegid ();
		722	#endif
		723	}
		724
		725	int
		726	ev_method (EV_P)
		727	{
		728	return method;
		729	}
		730
		731	static void
		732	loop_init (EV_P_ int methods)
		733	{
		734	if (!method)
		735	{
		736	#if EV_USE_MONOTONIC
		737	{
		738	struct timespec ts;
		739	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		740	have_monotonic = 1;
		741	}
		742	#endif
		743
		744	ev_rt_now = ev_time ();
		745	mn_now = get_clock ();
		746	now_floor = mn_now;
		747	rtmn_diff = ev_rt_now - mn_now;
		748
		749	if (methods == EVMETHOD_AUTO)
		750	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		751	methods = atoi (getenv ("LIBEV_METHODS"));
		752	else
		753	methods = EVMETHOD_ANY;
		754
		755	method = 0;
		756	#if EV_USE_WIN32
		757	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		758	#endif
		759	#if EV_USE_KQUEUE
		760	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		761	#endif
		762	#if EV_USE_EPOLL
		763	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		764	#endif
		765	#if EV_USE_POLL
		766	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		767	#endif
		768	#if EV_USE_SELECT
		769	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		770	#endif
		771
		772	ev_init (&sigev, sigcb);
		773	ev_set_priority (&sigev, EV_MAXPRI);
		774	}
		775	}
		776
		777	void
		778	loop_destroy (EV_P)
		779	{
		780	int i;
		781
		782	#if EV_USE_WIN32
		783	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		784	#endif
		785	#if EV_USE_KQUEUE
		786	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		787	#endif
		788	#if EV_USE_EPOLL
		789	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		790	#endif
		791	#if EV_USE_POLL
		792	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		793	#endif
		794	#if EV_USE_SELECT
		795	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		796	#endif
		797
		798	for (i = NUMPRI; i--; )
		799	array_free (pending, [i]);
		800
		801	/* have to use the microsoft-never-gets-it-right macro */
		802	array_free_microshit (fdchange);
		803	array_free_microshit (timer);
		804	array_free_microshit (periodic);
		805	array_free_microshit (idle);
		806	array_free_microshit (prepare);
		807	array_free_microshit (check);
		808
		809	method = 0;
		810	}
		811
		812	static void
		813	loop_fork (EV_P)
		814	{
		815	#if EV_USE_EPOLL
		816	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		817	#endif
		818	#if EV_USE_KQUEUE
		819	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		820	#endif
		821
		822	if (ev_is_active (&sigev))
		823	{
		824	/* default loop */
		825
		826	ev_ref (EV_A);
		827	ev_io_stop (EV_A_ &sigev);
		828	close (sigpipe [0]);
		829	close (sigpipe [1]);
		830
		831	while (pipe (sigpipe))
		832	syserr ("(libev) error creating pipe");
		833
		834	siginit (EV_A);
		835	}
		836
		837	postfork = 0;
		838	}
		839
		840	#if EV_MULTIPLICITY
		841	struct ev_loop *
		842	ev_loop_new (int methods)
		843	{
		844	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		845
		846	memset (loop, 0, sizeof (struct ev_loop));
		847
		848	loop_init (EV_A_ methods);
		849
		850	if (ev_method (EV_A))
		851	return loop;
		852
		853	return 0;
		854	}
		855
		856	void
		857	ev_loop_destroy (EV_P)
		858	{
		859	loop_destroy (EV_A);
		860	ev_free (loop);
		861	}
		862
		863	void
		864	ev_loop_fork (EV_P)
		865	{
		866	postfork = 1;
		867	}
		868
		869	#endif
		870
		871	#if EV_MULTIPLICITY
		872	struct ev_loop *
		873	#else
		874	int
		875	#endif
		876	ev_default_loop (int methods)
		877	{
		878	if (sigpipe [0] == sigpipe [1])
		879	if (pipe (sigpipe))
		880	return 0;
		881
		882	if (!default_loop)
		883	{
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *loop = default_loop = &default_loop_struct;
		886	#else
		887	default_loop = 1;
		888	#endif
		889
		890	loop_init (EV_A_ methods);
		891
		892	if (ev_method (EV_A))
261	{	893	{
262	method_modify (fd, anfd->wev, wev);	894	siginit (EV_A);
263	anfd->wev = wev;	895
		896	#ifndef WIN32
		897	ev_signal_init (&childev, childcb, SIGCHLD);
		898	ev_set_priority (&childev, EV_MAXPRI);
		899	ev_signal_start (EV_A_ &childev);
		900	ev_unref (EV_A); /* child watcher should not keep loop alive */
		901	#endif
264	}	902	}
		903	else
		904	default_loop = 0;
265	}	905	}
266		906
267	fdchangecnt = 0;	907	return default_loop;
268	}	908	}
269		909
		910	void
		911	ev_default_destroy (void)
		912	{
		913	#if EV_MULTIPLICITY
		914	struct ev_loop *loop = default_loop;
		915	#endif
		916
		917	#ifndef WIN32
		918	ev_ref (EV_A); /* child watcher */
		919	ev_signal_stop (EV_A_ &childev);
		920	#endif
		921
		922	ev_ref (EV_A); /* signal watcher */
		923	ev_io_stop (EV_A_ &sigev);
		924
		925	close (sigpipe [0]); sigpipe [0] = 0;
		926	close (sigpipe [1]); sigpipe [1] = 0;
		927
		928	loop_destroy (EV_A);
		929	}
		930
		931	void
		932	ev_default_fork (void)
		933	{
		934	#if EV_MULTIPLICITY
		935	struct ev_loop *loop = default_loop;
		936	#endif
		937
		938	if (method)
		939	postfork = 1;
		940	}
		941
		942	/*****************************************************************************/
		943
270	static void	944	static int
271	call_pending ()	945	any_pending (EV_P)
272	{	946	{
273	int i;	947	int pri;
274		948
275	for (i = 0; i < pendingcnt; ++i)	949	for (pri = NUMPRI; pri--; )
		950	if (pendingcnt [pri])
		951	return 1;
		952
		953	return 0;
		954	}
		955
		956	static void
		957	call_pending (EV_P)
		958	{
		959	int pri;
		960
		961	for (pri = NUMPRI; pri--; )
		962	while (pendingcnt [pri])
276	{	963	{
277	ANPENDING *p = pendings + i;	964	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		965
279	if (p->w)	966	if (p->w)
280	{	967	{
281	p->w->pending = 0;	968	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	969	EV_CB_INVOKE (p->w, p->events);
283	}	970	}
284	}	971	}
285
286	pendingcnt = 0;
287	}	972	}
288		973
289	static void	974	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	975	timers_reify (EV_P)
291	{	976	{
292	while (timercnt && timers [0]->at <= now)	977	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	978	{
294	struct ev_timer *w = timers [0];	979	struct ev_timer *w = timers [0];
		980
		981	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		982
296	/* first reschedule or stop timer */	983	/* first reschedule or stop timer */
297	if (w->repeat)	984	if (w->repeat)
298	{	985	{
299	if (w->is_abs)	986	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;
301	else
302	w->at = now + w->repeat;	987	((WT)w)->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	988	downheap ((WT *)timers, timercnt, 0);
307	}	989	}
308	else	990	else
		991	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		992
		993	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		994	}
		995	}
		996
		997	static void
		998	periodics_reify (EV_P)
		999	{
		1000	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1001	{
		1002	struct ev_periodic *w = periodics [0];
		1003
		1004	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1005
		1006	/* first reschedule or stop timer */
		1007	if (w->reschedule_cb)
309	{	1008	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1009	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	1010
		1011	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1012	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1013	}
		1014	else if (w->interval)
		1015	{
		1016	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1017	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1018	downheap ((WT *)periodics, periodiccnt, 0);
		1019	}
		1020	else
		1021	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1022
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1023	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1024	}
316	}	1025	}
317		1026
318	static void	1027	static void
319	time_update ()	1028	periodics_reschedule (EV_P)
320	{	1029	{
321	int i;	1030	int i;
		1031
		1032	/* adjust periodics after time jump */
		1033	for (i = 0; i < periodiccnt; ++i)
		1034	{
		1035	struct ev_periodic *w = periodics [i];
		1036
		1037	if (w->reschedule_cb)
		1038	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1039	else if (w->interval)
		1040	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1041	}
		1042
		1043	/* now rebuild the heap */
		1044	for (i = periodiccnt >> 1; i--; )
		1045	downheap ((WT *)periodics, periodiccnt, i);
		1046	}
		1047
		1048	inline int
		1049	time_update_monotonic (EV_P)
		1050	{
		1051	mn_now = get_clock ();
		1052
		1053	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1054	{
		1055	ev_rt_now = rtmn_diff + mn_now;
		1056	return 0;
		1057	}
		1058	else
		1059	{
		1060	now_floor = mn_now;
322	ev_now = ev_time ();	1061	ev_rt_now = ev_time ();
323		1062	return 1;
324	if (have_monotonic)
325	{	1063	}
326	ev_tstamp odiff = diff;	1064	}
327		1065
328	/* detecting time jumps is much more difficult */	1066	static void
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1067	time_update (EV_P)
		1068	{
		1069	int i;
		1070
		1071	#if EV_USE_MONOTONIC
		1072	if (expect_true (have_monotonic))
		1073	{
		1074	if (time_update_monotonic (EV_A))
330	{	1075	{
331	now = get_clock ();	1076	ev_tstamp odiff = rtmn_diff;
		1077
		1078	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1079	{
332	diff = ev_now - now;	1080	rtmn_diff = ev_rt_now - mn_now;
333		1081
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1082	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1083	return; /* all is well */
336		1084
337	ev_now = ev_time ();	1085	ev_rt_now = ev_time ();
		1086	mn_now = get_clock ();
		1087	now_floor = mn_now;
		1088	}
		1089
		1090	periodics_reschedule (EV_A);
		1091	/* no timer adjustment, as the monotonic clock doesn't jump */
		1092	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1093	}
		1094	}
		1095	else
		1096	#endif
		1097	{
		1098	ev_rt_now = ev_time ();
339		1099
340	/* time jump detected, reschedule atimers */	1100	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	{	1101	{
343	struct ev_timer *w = atimers [i];	1102	periodics_reschedule (EV_A);
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1103
		1104	/* adjust timers. this is easy, as the offset is the same for all */
		1105	for (i = 0; i < timercnt; ++i)
		1106	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1107	}
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		1108
354	now = ev_now;	1109	mn_now = ev_rt_now;
355	}	1110	}
356	}	1111	}
357		1112
358	int ev_loop_done;	1113	void
		1114	ev_ref (EV_P)
		1115	{
		1116	++activecnt;
		1117	}
359		1118
		1119	void
		1120	ev_unref (EV_P)
		1121	{
		1122	--activecnt;
		1123	}
		1124
		1125	static int loop_done;
		1126
		1127	void
360	void ev_loop (int flags)	1128	ev_loop (EV_P_ int flags)
361	{	1129	{
362	double block;	1130	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1131	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1132
365	do	1133	do
366	{	1134	{
		1135	/* queue check watchers (and execute them) */
		1136	if (expect_false (preparecnt))
		1137	{
		1138	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1139	call_pending (EV_A);
		1140	}
		1141
		1142	/* we might have forked, so reify kernel state if necessary */
		1143	if (expect_false (postfork))
		1144	loop_fork (EV_A);
		1145
367	/* update fd-related kernel structures */	1146	/* update fd-related kernel structures */
368	fd_reify ();	1147	fd_reify (EV_A);
369		1148
370	/* calculate blocking time */	1149	/* calculate blocking time */
		1150
		1151	/* we only need this for !monotonic clock or timers, but as we basically
		1152	always have timers, we just calculate it always */
		1153	#if EV_USE_MONOTONIC
		1154	if (expect_true (have_monotonic))
		1155	time_update_monotonic (EV_A);
		1156	else
		1157	#endif
		1158	{
		1159	ev_rt_now = ev_time ();
		1160	mn_now = ev_rt_now;
		1161	}
		1162
371	if (flags & EVLOOP_NONBLOCK)	1163	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1164	block = 0.;
373	else	1165	else
374	{	1166	{
375	block = MAX_BLOCKTIME;	1167	block = MAX_BLOCKTIME;
376		1168
377	if (rtimercnt)	1169	if (timercnt)
378	{	1170	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1171	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1172	if (block > to) block = to;
381	}	1173	}
382		1174
383	if (atimercnt)	1175	if (periodiccnt)
384	{	1176	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1177	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
386	if (block > to) block = to;	1178	if (block > to) block = to;
387	}	1179	}
388		1180
389	if (block < 0.) block = 0.;	1181	if (block < 0.) block = 0.;
390	}	1182	}
391		1183
392	method_poll (block);	1184	method_poll (EV_A_ block);
393		1185
394	/* update ev_now, do magic */	1186	/* update ev_rt_now, do magic */
395	time_update ();	1187	time_update (EV_A);
396		1188
397	/* put pending timers into pendign queue and reschedule them */	1189	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1190	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1191	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1192
		1193	/* queue idle watchers unless io or timers are pending */
		1194	if (idlecnt && !any_pending (EV_A))
		1195	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1196
		1197	/* queue check watchers, to be executed first */
		1198	if (checkcnt)
		1199	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1200
403	call_pending ();	1201	call_pending (EV_A);
404	}	1202	}
405	while (!ev_loop_done);	1203	while (activecnt && !loop_done);
406	}
407		1204
408	static void	1205	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1206	loop_done = 0;
		1207	}
		1208
		1209	void
		1210	ev_unloop (EV_P_ int how)
		1211	{
		1212	loop_done = how;
		1213	}
		1214
		1215	/*****************************************************************************/
		1216
		1217	inline void
		1218	wlist_add (WL *head, WL elem)
410	{	1219	{
411	elem->next = *head;	1220	elem->next = *head;
412	*head = elem;	1221	*head = elem;
413	}	1222	}
414		1223
415	static void	1224	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1225	wlist_del (WL *head, WL elem)
417	{	1226	{
418	while (*head)	1227	while (*head)
419	{	1228	{
420	if (*head == elem)	1229	if (*head == elem)
421	{	1230	{
…		…
425		1234
426	head = &(*head)->next;	1235	head = &(*head)->next;
427	}	1236	}
428	}	1237	}
429		1238
430	static void	1239	inline void
431	ev_start (struct ev_watcher *w, int active)	1240	ev_clear_pending (EV_P_ W w)
432	{	1241	{
		1242	if (w->pending)
		1243	{
		1244	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1245	w->pending = 0;
		1246	}
		1247	}
		1248
		1249	inline void
		1250	ev_start (EV_P_ W w, int active)
		1251	{
		1252	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1253	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1254
434	w->active = active;	1255	w->active = active;
		1256	ev_ref (EV_A);
435	}	1257	}
436		1258
437	static void	1259	inline void
438	ev_stop (struct ev_watcher *w)	1260	ev_stop (EV_P_ W w)
439	{	1261	{
440	if (w->pending)	1262	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1263	w->active = 0;
444	/* nop */
445	}	1264	}
446		1265
		1266	/*****************************************************************************/
		1267
447	void	1268	void
448	evio_start (struct ev_io *w)	1269	ev_io_start (EV_P_ struct ev_io *w)
449	{	1270	{
		1271	int fd = w->fd;
		1272
450	if (ev_is_active (w))	1273	if (ev_is_active (w))
451	return;	1274	return;
452		1275
453	int fd = w->fd;	1276	assert (("ev_io_start called with negative fd", fd >= 0));
454		1277
455	ev_start ((struct ev_watcher *)w, 1);	1278	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1279	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1280	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1281
459	++fdchangecnt;	1282	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1283	}
463		1284
464	void	1285	void
465	evio_stop (struct ev_io *w)	1286	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1287	{
		1288	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1289	if (!ev_is_active (w))
468	return;	1290	return;
469		1291
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1292	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1293	ev_stop (EV_A_ (W)w);
472		1294
473	++fdchangecnt;	1295	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1296	}
477		1297
478	void	1298	void
479	evtimer_start (struct ev_timer *w)	1299	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1300	{
481	if (ev_is_active (w))	1301	if (ev_is_active (w))
482	return;	1302	return;
483		1303
484	if (w->is_abs)	1304	((WT)w)->at += mn_now;
		1305
		1306	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1307
		1308	ev_start (EV_A_ (W)w, ++timercnt);
		1309	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1310	timers [timercnt - 1] = w;
		1311	upheap ((WT *)timers, timercnt - 1);
		1312
		1313	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1314	}
		1315
		1316	void
		1317	ev_timer_stop (EV_P_ struct ev_timer *w)
		1318	{
		1319	ev_clear_pending (EV_A_ (W)w);
		1320	if (!ev_is_active (w))
		1321	return;
		1322
		1323	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1324
		1325	if (((W)w)->active < timercnt--)
		1326	{
		1327	timers [((W)w)->active - 1] = timers [timercnt];
		1328	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1329	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1330
		1331	((WT)w)->at = w->repeat;
		1332
		1333	ev_stop (EV_A_ (W)w);
		1334	}
		1335
		1336	void
		1337	ev_timer_again (EV_P_ struct ev_timer *w)
		1338	{
		1339	if (ev_is_active (w))
		1340	{
487	if (w->repeat)	1341	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1342	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1343	else
		1344	ev_timer_stop (EV_A_ w);
		1345	}
		1346	else if (w->repeat)
		1347	ev_timer_start (EV_A_ w);
		1348	}
489		1349
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1350	void
491	array_needsize (atimers, atimermax, atimercnt, );	1351	ev_periodic_start (EV_P_ struct ev_periodic *w)
492	atimers [atimercnt - 1] = w;	1352	{
493	upheap (atimers, atimercnt - 1);	1353	if (ev_is_active (w))
		1354	return;
		1355
		1356	if (w->reschedule_cb)
		1357	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1358	else if (w->interval)
494	}	1359	{
		1360	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1361	/* this formula differs from the one in periodic_reify because we do not always round up */
		1362	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1363	}
		1364
		1365	ev_start (EV_A_ (W)w, ++periodiccnt);
		1366	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1367	periodics [periodiccnt - 1] = w;
		1368	upheap ((WT *)periodics, periodiccnt - 1);
		1369
		1370	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1371	}
		1372
		1373	void
		1374	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1375	{
		1376	ev_clear_pending (EV_A_ (W)w);
		1377	if (!ev_is_active (w))
		1378	return;
		1379
		1380	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1381
		1382	if (((W)w)->active < periodiccnt--)
		1383	{
		1384	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1385	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1386	}
		1387
		1388	ev_stop (EV_A_ (W)w);
		1389	}
		1390
		1391	void
		1392	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1393	{
		1394	/* TODO: use adjustheap and recalculation */
		1395	ev_periodic_stop (EV_A_ w);
		1396	ev_periodic_start (EV_A_ w);
		1397	}
		1398
		1399	void
		1400	ev_idle_start (EV_P_ struct ev_idle *w)
		1401	{
		1402	if (ev_is_active (w))
		1403	return;
		1404
		1405	ev_start (EV_A_ (W)w, ++idlecnt);
		1406	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1407	idles [idlecnt - 1] = w;
		1408	}
		1409
		1410	void
		1411	ev_idle_stop (EV_P_ struct ev_idle *w)
		1412	{
		1413	ev_clear_pending (EV_A_ (W)w);
		1414	if (ev_is_active (w))
		1415	return;
		1416
		1417	idles [((W)w)->active - 1] = idles [--idlecnt];
		1418	ev_stop (EV_A_ (W)w);
		1419	}
		1420
		1421	void
		1422	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1423	{
		1424	if (ev_is_active (w))
		1425	return;
		1426
		1427	ev_start (EV_A_ (W)w, ++preparecnt);
		1428	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1429	prepares [preparecnt - 1] = w;
		1430	}
		1431
		1432	void
		1433	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1434	{
		1435	ev_clear_pending (EV_A_ (W)w);
		1436	if (ev_is_active (w))
		1437	return;
		1438
		1439	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1440	ev_stop (EV_A_ (W)w);
		1441	}
		1442
		1443	void
		1444	ev_check_start (EV_P_ struct ev_check *w)
		1445	{
		1446	if (ev_is_active (w))
		1447	return;
		1448
		1449	ev_start (EV_A_ (W)w, ++checkcnt);
		1450	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1451	checks [checkcnt - 1] = w;
		1452	}
		1453
		1454	void
		1455	ev_check_stop (EV_P_ struct ev_check *w)
		1456	{
		1457	ev_clear_pending (EV_A_ (W)w);
		1458	if (ev_is_active (w))
		1459	return;
		1460
		1461	checks [((W)w)->active - 1] = checks [--checkcnt];
		1462	ev_stop (EV_A_ (W)w);
		1463	}
		1464
		1465	#ifndef SA_RESTART
		1466	# define SA_RESTART 0
		1467	#endif
		1468
		1469	void
		1470	ev_signal_start (EV_P_ struct ev_signal *w)
		1471	{
		1472	#if EV_MULTIPLICITY
		1473	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1474	#endif
		1475	if (ev_is_active (w))
		1476	return;
		1477
		1478	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1479
		1480	ev_start (EV_A_ (W)w, 1);
		1481	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1482	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1483
		1484	if (!((WL)w)->next)
		1485	{
		1486	#if WIN32
		1487	signal (w->signum, sighandler);
		1488	#else
		1489	struct sigaction sa;
		1490	sa.sa_handler = sighandler;
		1491	sigfillset (&sa.sa_mask);
		1492	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1493	sigaction (w->signum, &sa, 0);
		1494	#endif
		1495	}
		1496	}
		1497
		1498	void
		1499	ev_signal_stop (EV_P_ struct ev_signal *w)
		1500	{
		1501	ev_clear_pending (EV_A_ (W)w);
		1502	if (!ev_is_active (w))
		1503	return;
		1504
		1505	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1506	ev_stop (EV_A_ (W)w);
		1507
		1508	if (!signals [w->signum - 1].head)
		1509	signal (w->signum, SIG_DFL);
		1510	}
		1511
		1512	void
		1513	ev_child_start (EV_P_ struct ev_child *w)
		1514	{
		1515	#if EV_MULTIPLICITY
		1516	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1517	#endif
		1518	if (ev_is_active (w))
		1519	return;
		1520
		1521	ev_start (EV_A_ (W)w, 1);
		1522	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1523	}
		1524
		1525	void
		1526	ev_child_stop (EV_P_ struct ev_child *w)
		1527	{
		1528	ev_clear_pending (EV_A_ (W)w);
		1529	if (ev_is_active (w))
		1530	return;
		1531
		1532	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1533	ev_stop (EV_A_ (W)w);
		1534	}
		1535
		1536	/*****************************************************************************/
		1537
		1538	struct ev_once
		1539	{
		1540	struct ev_io io;
		1541	struct ev_timer to;
		1542	void (*cb)(int revents, void *arg);
		1543	void *arg;
		1544	};
		1545
		1546	static void
		1547	once_cb (EV_P_ struct ev_once *once, int revents)
		1548	{
		1549	void (*cb)(int revents, void *arg) = once->cb;
		1550	void *arg = once->arg;
		1551
		1552	ev_io_stop (EV_A_ &once->io);
		1553	ev_timer_stop (EV_A_ &once->to);
		1554	ev_free (once);
		1555
		1556	cb (revents, arg);
		1557	}
		1558
		1559	static void
		1560	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1561	{
		1562	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1563	}
		1564
		1565	static void
		1566	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1567	{
		1568	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1569	}
		1570
		1571	void
		1572	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1573	{
		1574	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1575
		1576	if (!once)
		1577	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1578	else
496	{	1579	{
497	w->at += now;	1580	once->cb = cb;
		1581	once->arg = arg;
498		1582
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1583	ev_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1584	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	1585	{
517	atimers [w->active - 1] = atimers [atimercnt];	1586	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1587	ev_io_start (EV_A_ &once->io);
519	}	1588	}
520	}	1589
521	else	1590	ev_init (&once->to, once_cb_to);
522	{	1591	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1592	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1593	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1594	ev_timer_start (EV_A_ &once->to);
527	}	1595	}
528	}	1596	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1597	}
532		1598
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/
555	#if 1
556
557	static void
558	sin_cb (struct ev_io *w, int revents)
559	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561	}
562
563	static void
564	ocb (struct ev_timer *w, int revents)
565	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}
570
571	int main (void)
572	{
573	struct ev_io sin;
574
575	ev_init (0);
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}
594	#endif
595
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;
604	}
605
606	#endif
607
608
609
610

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines