[ViewVC] Diff of: cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.98 by root, Sun Nov 11 02:05:20 2007 UTC

…		…
		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	68	#include <fcntl.h>
5	#include <signal.h>	69	#include <stddef.h>
6		70
7	#include <stdio.h>	71	#include <stdio.h>
8		72
9	#include <assert.h>	73	#include <assert.h>
10	#include <errno.h>	74	#include <errno.h>
11	#include <sys/time.h>	75	#include <sys/types.h>
12	#include <time.h>	76	#include <time.h>
13		77
		78	#include <signal.h>
		79
		80	#ifndef WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#endif
		85	/**/
		86
14	#ifndef HAVE_MONOTONIC	87	#ifndef EV_USE_MONOTONIC
15	# ifdef CLOCK_MONOTONIC
16	# define HAVE_MONOTONIC 1	88	# define EV_USE_MONOTONIC 1
		89	#endif
		90
		91	#ifndef EV_USE_SELECT
		92	# define EV_USE_SELECT 1
		93	#endif
		94
		95	#ifndef EV_USE_POLL
		96	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		97	#endif
		98
		99	#ifndef EV_USE_EPOLL
		100	# define EV_USE_EPOLL 0
		101	#endif
		102
		103	#ifndef EV_USE_KQUEUE
		104	# define EV_USE_KQUEUE 0
		105	#endif
		106
		107	#ifndef EV_USE_WIN32
		108	# ifdef WIN32
		109	# define EV_USE_WIN32 0 /* it does not exist, use select */
		110	# undef EV_USE_SELECT
		111	# define EV_USE_SELECT 1
		112	# else
		113	# define EV_USE_WIN32 0
17	# endif	114	# endif
18	#endif	115	#endif
19		116
20	#ifndef HAVE_SELECT
21	# define HAVE_SELECT 1
22	#endif
23
24	#ifndef HAVE_EPOLL
25	# define HAVE_EPOLL 0
26	#endif
27
28	#ifndef HAVE_REALTIME	117	#ifndef EV_USE_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	118	# define EV_USE_REALTIME 1
30	#endif	119	#endif
		120
		121	/**/
		122
		123	#ifndef CLOCK_MONOTONIC
		124	# undef EV_USE_MONOTONIC
		125	# define EV_USE_MONOTONIC 0
		126	#endif
		127
		128	#ifndef CLOCK_REALTIME
		129	# undef EV_USE_REALTIME
		130	# define EV_USE_REALTIME 0
		131	#endif
		132
		133	/**/
31		134
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	135	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	136	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		137	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		138	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
34		139
		140	#ifdef EV_H
		141	# include EV_H
		142	#else
35	#include "ev.h"	143	# include "ev.h"
		144	#endif
36		145
37	struct ev_watcher {	146	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	147	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	148	# define inline inline
		149	#else
		150	# define expect(expr,value) (expr)
		151	# define inline static
		152	#endif
40		153
41	struct ev_watcher_list {	154	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	155	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	156
		157	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		158	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		159
45	typedef struct ev_watcher *W;	160	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	161	typedef struct ev_watcher_list *WL;
		162	typedef struct ev_watcher_time *WT;
47		163
48	static ev_tstamp now, diff; /* monotonic clock */	164	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		165
		166	#ifdef WIN32
		167	# include "ev_win32.c"
		168	#endif
		169
		170	/*****************************************************************************/
		171
		172	static void (syserr_cb)(const char msg);
		173
		174	void ev_set_syserr_cb (void (cb)(const char msg))
		175	{
		176	syserr_cb = cb;
		177	}
		178
		179	static void
		180	syserr (const char *msg)
		181	{
		182	if (!msg)
		183	msg = "(libev) system error";
		184
		185	if (syserr_cb)
		186	syserr_cb (msg);
		187	else
		188	{
		189	perror (msg);
		190	abort ();
		191	}
		192	}
		193
		194	static void (alloc)(void *ptr, long size);
		195
		196	void ev_set_allocator (void (cb)(void *ptr, long size))
		197	{
		198	alloc = cb;
		199	}
		200
		201	static void *
		202	ev_realloc (void *ptr, long size)
		203	{
		204	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		205
		206	if (!ptr && size)
		207	{
		208	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		209	abort ();
		210	}
		211
		212	return ptr;
		213	}
		214
		215	#define ev_malloc(size) ev_realloc (0, (size))
		216	#define ev_free(ptr) ev_realloc ((ptr), 0)
		217
		218	/*****************************************************************************/
		219
		220	typedef struct
		221	{
		222	WL head;
		223	unsigned char events;
		224	unsigned char reify;
		225	} ANFD;
		226
		227	typedef struct
		228	{
		229	W w;
		230	int events;
		231	} ANPENDING;
		232
		233	#if EV_MULTIPLICITY
		234
		235	struct ev_loop
		236	{
		237	ev_tstamp ev_rt_now;
		238	#define VAR(name,decl) decl;
		239	#include "ev_vars.h"
		240	#undef VAR
		241	};
		242	#include "ev_wrap.h"
		243
		244	struct ev_loop default_loop_struct;
		245	static struct ev_loop *default_loop;
		246
		247	#else
		248
49	ev_tstamp ev_now;	249	ev_tstamp ev_rt_now;
50	int ev_method;	250	#define VAR(name,decl) static decl;
		251	#include "ev_vars.h"
		252	#undef VAR
51		253
52	static int have_monotonic; /* runtime */	254	static int default_loop;
53		255
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	256	#endif
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		257
58	/*****************************************************************************/	258	/*****************************************************************************/
59		259
60	ev_tstamp	260	ev_tstamp
61	ev_time (void)	261	ev_time (void)
62	{	262	{
63	#if HAVE_REALTIME	263	#if EV_USE_REALTIME
64	struct timespec ts;	264	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	265	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	266	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	267	#else
68	struct timeval tv;	268	struct timeval tv;
69	gettimeofday (&tv, 0);	269	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	270	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	271	#endif
72	}	272	}
73		273
74	static ev_tstamp	274	inline ev_tstamp
75	get_clock (void)	275	get_clock (void)
76	{	276	{
77	#if HAVE_MONOTONIC	277	#if EV_USE_MONOTONIC
78	if (have_monotonic)	278	if (expect_true (have_monotonic))
79	{	279	{
80	struct timespec ts;	280	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	281	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	282	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	283	}
84	#endif	284	#endif
85		285
86	return ev_time ();	286	return ev_time ();
87	}	287	}
88		288
		289	#if EV_MULTIPLICITY
		290	ev_tstamp
		291	ev_now (EV_P)
		292	{
		293	return ev_rt_now;
		294	}
		295	#endif
		296
		297	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		298
89	#define array_needsize(base,cur,cnt,init) \	299	#define array_needsize(type,base,cur,cnt,init) \
90	if ((cnt) > cur) \	300	if (expect_false ((cnt) > cur)) \
91	{ \	301	{ \
92	int newcnt = cur ? cur << 1 : 16; \	302	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	303	do \
		304	{ \
		305	newcnt = array_roundsize (type, newcnt << 1); \
		306	} \
		307	while ((cnt) > newcnt); \
		308	\
94	base = realloc (base, sizeof (base) (newcnt)); \	309	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
95	init (base + cur, newcnt - cur); \	310	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	311	cur = newcnt; \
97	}	312	}
		313
		314	#define array_slim(type,stem) \
		315	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		316	{ \
		317	stem ## max = array_roundsize (stem ## cnt >> 1); \
		318	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		319	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		320	}
		321
		322	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		323	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		324	#define array_free_microshit(stem) \
		325	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		326
		327	#define array_free(stem, idx) \
		328	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		329
99	/*****************************************************************************/	330	/*****************************************************************************/
100		331
101	typedef struct
102	{
103	struct ev_io *head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	332	static void
114	anfds_init (ANFD *base, int count)	333	anfds_init (ANFD *base, int count)
115	{	334	{
116	while (count--)	335	while (count--)
117	{	336	{
118	base->head = 0;	337	base->head = 0;
119	base->wev = base->rev = EV_NONE;	338	base->events = EV_NONE;
		339	base->reify = 0;
		340
120	++base;	341	++base;
121	}	342	}
122	}	343	}
123		344
124	typedef struct	345	void
		346	ev_feed_event (EV_P_ void *w, int revents)
125	{	347	{
126	W w;	348	W w_ = (W)w;
127	int events;
128	} ANPENDING;
129		349
130	static ANPENDING *pendings;	350	if (w_->pending)
131	static int pendingmax, pendingcnt;	351	{
		352	pendings [ABSPRI (w_)][w_->pending - 1].events \|= revents;
		353	return;
		354	}
132		355
133	static void
134	event (W w, int events)
135	{
136	w->pending = ++pendingcnt;	356	w_->pending = ++pendingcnt [ABSPRI (w_)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	357	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
138	pendings [pendingcnt - 1].w = w;	358	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
139	pendings [pendingcnt - 1].events = events;	359	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
140	}	360	}
141		361
142	static void	362	static void
		363	queue_events (EV_P_ W *events, int eventcnt, int type)
		364	{
		365	int i;
		366
		367	for (i = 0; i < eventcnt; ++i)
		368	ev_feed_event (EV_A_ events [i], type);
		369	}
		370
		371	inline void
143	fd_event (int fd, int events)	372	fd_event (EV_P_ int fd, int revents)
144	{	373	{
145	ANFD *anfd = anfds + fd;	374	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	375	struct ev_io *w;
147		376
148	for (w = anfd->head; w; w = w->next)	377	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
149	{	378	{
150	int ev = w->events & events;	379	int ev = w->events & revents;
151		380
152	if (ev)	381	if (ev)
153	event ((W)w, ev);	382	ev_feed_event (EV_A_ (W)w, ev);
154	}	383	}
155	}	384	}
156		385
		386	void
		387	ev_feed_fd_event (EV_P_ int fd, int revents)
		388	{
		389	fd_event (EV_A_ fd, revents);
		390	}
		391
		392	/*****************************************************************************/
		393
157	static void	394	static void
158	queue_events (W *events, int eventcnt, int type)	395	fd_reify (EV_P)
159	{	396	{
160	int i;	397	int i;
161		398
162	for (i = 0; i < eventcnt; ++i)	399	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	400	{
		401	int fd = fdchanges [i];
		402	ANFD *anfd = anfds + fd;
		403	struct ev_io *w;
		404
		405	int events = 0;
		406
		407	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		408	events \|= w->events;
		409
		410	anfd->reify = 0;
		411
		412	method_modify (EV_A_ fd, anfd->events, events);
		413	anfd->events = events;
		414	}
		415
		416	fdchangecnt = 0;
		417	}
		418
		419	static void
		420	fd_change (EV_P_ int fd)
		421	{
		422	if (anfds [fd].reify)
		423	return;
		424
		425	anfds [fd].reify = 1;
		426
		427	++fdchangecnt;
		428	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		429	fdchanges [fdchangecnt - 1] = fd;
		430	}
		431
		432	static void
		433	fd_kill (EV_P_ int fd)
		434	{
		435	struct ev_io *w;
		436
		437	while ((w = (struct ev_io *)anfds [fd].head))
		438	{
		439	ev_io_stop (EV_A_ w);
		440	ev_feed_event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		441	}
		442	}
		443
		444	static int
		445	fd_valid (int fd)
		446	{
		447	#ifdef WIN32
		448	return !!win32_get_osfhandle (fd);
		449	#else
		450	return fcntl (fd, F_GETFD) != -1;
		451	#endif
		452	}
		453
		454	/* called on EBADF to verify fds */
		455	static void
		456	fd_ebadf (EV_P)
		457	{
		458	int fd;
		459
		460	for (fd = 0; fd < anfdmax; ++fd)
		461	if (anfds [fd].events)
		462	if (!fd_valid (fd) == -1 && errno == EBADF)
		463	fd_kill (EV_A_ fd);
		464	}
		465
		466	/* called on ENOMEM in select/poll to kill some fds and retry */
		467	static void
		468	fd_enomem (EV_P)
		469	{
		470	int fd;
		471
		472	for (fd = anfdmax; fd--; )
		473	if (anfds [fd].events)
		474	{
		475	fd_kill (EV_A_ fd);
		476	return;
		477	}
		478	}
		479
		480	/* usually called after fork if method needs to re-arm all fds from scratch */
		481	static void
		482	fd_rearm_all (EV_P)
		483	{
		484	int fd;
		485
		486	/* this should be highly optimised to not do anything but set a flag */
		487	for (fd = 0; fd < anfdmax; ++fd)
		488	if (anfds [fd].events)
		489	{
		490	anfds [fd].events = 0;
		491	fd_change (EV_A_ fd);
		492	}
164	}	493	}
165		494
166	/*****************************************************************************/	495	/*****************************************************************************/
167		496
168	static struct ev_timer **atimers;
169	static int atimermax, atimercnt;
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void	497	static void
175	upheap (struct ev_timer **timers, int k)	498	upheap (WT *heap, int k)
176	{	499	{
177	struct ev_timer *w = timers [k];	500	WT w = heap [k];
178		501
179	while (k && timers [k >> 1]->at > w->at)	502	while (k && heap [k >> 1]->at > w->at)
180	{	503	{
181	timers [k] = timers [k >> 1];	504	heap [k] = heap [k >> 1];
182	timers [k]->active = k + 1;	505	((W)heap [k])->active = k + 1;
183	k >>= 1;	506	k >>= 1;
184	}	507	}
185		508
186	timers [k] = w;	509	heap [k] = w;
187	timers [k]->active = k + 1;	510	((W)heap [k])->active = k + 1;
188		511
189	}	512	}
190		513
191	static void	514	static void
192	downheap (struct ev_timer **timers, int N, int k)	515	downheap (WT *heap, int N, int k)
193	{	516	{
194	struct ev_timer *w = timers [k];	517	WT w = heap [k];
195		518
196	while (k < (N >> 1))	519	while (k < (N >> 1))
197	{	520	{
198	int j = k << 1;	521	int j = k << 1;
199		522
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	523	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
201	++j;	524	++j;
202		525
203	if (w->at <= timers [j]->at)	526	if (w->at <= heap [j]->at)
204	break;	527	break;
205		528
206	timers [k] = timers [j];	529	heap [k] = heap [j];
207	timers [k]->active = k + 1;	530	((W)heap [k])->active = k + 1;
208	k = j;	531	k = j;
209	}	532	}
210		533
211	timers [k] = w;	534	heap [k] = w;
212	timers [k]->active = k + 1;	535	((W)heap [k])->active = k + 1;
		536	}
		537
		538	inline void
		539	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		540	{
		541	ev_tstamp old_at = heap [k]->at;
		542	heap [k]->at = at;
		543
		544	if (old_at < at)
		545	downheap (heap, N, k);
		546	else
		547	upheap (heap, k);
213	}	548	}
214		549
215	/*****************************************************************************/	550	/*****************************************************************************/
216		551
217	typedef struct	552	typedef struct
218	{	553	{
219	struct ev_signal *head;	554	WL head;
220	sig_atomic_t gotsig;	555	sig_atomic_t volatile gotsig;
221	} ANSIG;	556	} ANSIG;
222		557
223	static ANSIG *signals;	558	static ANSIG *signals;
224	static int signalmax;	559	static int signalmax;
225		560
226	static int sigpipe [2];	561	static int sigpipe [2];
227	static sig_atomic_t gotsig;	562	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	563	static struct ev_io sigev;
229		564
230	static void	565	static void
231	signals_init (ANSIG *base, int count)	566	signals_init (ANSIG *base, int count)
232	{	567	{
233	while (count--)	568	while (count--)
234	{	569	{
235	base->head = 0;	570	base->head = 0;
236	base->gotsig = 0;	571	base->gotsig = 0;
		572
237	++base;	573	++base;
238	}	574	}
239	}	575	}
240		576
241	static void	577	static void
242	sighandler (int signum)	578	sighandler (int signum)
243	{	579	{
		580	#if WIN32
		581	signal (signum, sighandler);
		582	#endif
		583
244	signals [signum - 1].gotsig = 1;	584	signals [signum - 1].gotsig = 1;
245		585
246	if (!gotsig)	586	if (!gotsig)
247	{	587	{
		588	int old_errno = errno;
248	gotsig = 1;	589	gotsig = 1;
		590	#ifdef WIN32
		591	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		592	#else
249	write (sigpipe [1], &gotsig, 1);	593	write (sigpipe [1], &signum, 1);
		594	#endif
		595	errno = old_errno;
250	}	596	}
251	}	597	}
252		598
		599	void
		600	ev_feed_signal_event (EV_P_ int signum)
		601	{
		602	WL w;
		603
		604	#if EV_MULTIPLICITY
		605	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		606	#endif
		607
		608	--signum;
		609
		610	if (signum < 0 \|\| signum >= signalmax)
		611	return;
		612
		613	signals [signum].gotsig = 0;
		614
		615	for (w = signals [signum].head; w; w = w->next)
		616	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		617	}
		618
253	static void	619	static void
254	sigcb (struct ev_io *iow, int revents)	620	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	621	{
256	struct ev_signal *w;
257	int sig;	622	int signum;
258		623
		624	#ifdef WIN32
		625	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		626	#else
		627	read (sigpipe [0], &revents, 1);
		628	#endif
259	gotsig = 0;	629	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		630
262	for (sig = signalmax; sig--; )	631	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	632	if (signals [signum].gotsig)
264	{	633	ev_feed_signal_event (EV_A_ signum + 1);
265	signals [sig].gotsig = 0;
266
267	for (w = signals [sig].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);
269	}
270	}	634	}
271		635
272	static void	636	static void
273	siginit (void)	637	siginit (EV_P)
274	{	638	{
		639	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	640	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	641	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		642
278	/* rather than sort out wether we really need nb, set it */	643	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	644	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	645	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		646	#endif
281		647
282	evio_set (&sigev, sigpipe [0], EV_READ);	648	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	649	ev_io_start (EV_A_ &sigev);
		650	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	651	}
285		652
286	/*****************************************************************************/	653	/*****************************************************************************/
287		654
288	static struct ev_idle **idles;	655	static struct ev_child *childs [PID_HASHSIZE];
289	static int idlemax, idlecnt;
290		656
291	static struct ev_check **checks;	657	#ifndef WIN32
292	static int checkmax, checkcnt;	658
		659	static struct ev_signal childev;
		660
		661	#ifndef WCONTINUED
		662	# define WCONTINUED 0
		663	#endif
		664
		665	static void
		666	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		667	{
		668	struct ev_child *w;
		669
		670	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		671	if (w->pid == pid \|\| !w->pid)
		672	{
		673	ev_priority (w) = ev_priority (sw); /* need to do it now */
		674	w->rpid = pid;
		675	w->rstatus = status;
		676	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		677	}
		678	}
		679
		680	static void
		681	childcb (EV_P_ struct ev_signal *sw, int revents)
		682	{
		683	int pid, status;
		684
		685	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		686	{
		687	/* make sure we are called again until all childs have been reaped */
		688	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		689
		690	child_reap (EV_A_ sw, pid, pid, status);
		691	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		692	}
		693	}
		694
		695	#endif
293		696
294	/*****************************************************************************/	697	/*****************************************************************************/
295		698
		699	#if EV_USE_KQUEUE
		700	# include "ev_kqueue.c"
		701	#endif
296	#if HAVE_EPOLL	702	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	703	# include "ev_epoll.c"
298	#endif	704	#endif
		705	#if EV_USE_POLL
		706	# include "ev_poll.c"
		707	#endif
299	#if HAVE_SELECT	708	#if EV_USE_SELECT
300	# include "ev_select.c"	709	# include "ev_select.c"
301	#endif	710	#endif
302		711
303	int ev_init (int flags)	712	int
		713	ev_version_major (void)
304	{	714	{
		715	return EV_VERSION_MAJOR;
		716	}
		717
		718	int
		719	ev_version_minor (void)
		720	{
		721	return EV_VERSION_MINOR;
		722	}
		723
		724	/* return true if we are running with elevated privileges and should ignore env variables */
		725	static int
		726	enable_secure (void)
		727	{
		728	#ifdef WIN32
		729	return 0;
		730	#else
		731	return getuid () != geteuid ()
		732	\|\| getgid () != getegid ();
		733	#endif
		734	}
		735
		736	int
		737	ev_method (EV_P)
		738	{
		739	return method;
		740	}
		741
		742	static void
		743	loop_init (EV_P_ int methods)
		744	{
		745	if (!method)
		746	{
305	#if HAVE_MONOTONIC	747	#if EV_USE_MONOTONIC
306	{	748	{
307	struct timespec ts;	749	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	750	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	751	have_monotonic = 1;
310	}	752	}
311	#endif	753	#endif
312		754
313	ev_now = ev_time ();	755	ev_rt_now = ev_time ();
314	now = get_clock ();	756	mn_now = get_clock ();
315	diff = ev_now - now;	757	now_floor = mn_now;
		758	rtmn_diff = ev_rt_now - mn_now;
316		759
		760	if (methods == EVMETHOD_AUTO)
		761	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		762	methods = atoi (getenv ("LIBEV_METHODS"));
		763	else
		764	methods = EVMETHOD_ANY;
		765
		766	method = 0;
		767	#if EV_USE_WIN32
		768	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		769	#endif
		770	#if EV_USE_KQUEUE
		771	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		772	#endif
		773	#if EV_USE_EPOLL
		774	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		775	#endif
		776	#if EV_USE_POLL
		777	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		778	#endif
		779	#if EV_USE_SELECT
		780	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		781	#endif
		782
		783	ev_init (&sigev, sigcb);
		784	ev_set_priority (&sigev, EV_MAXPRI);
		785	}
		786	}
		787
		788	void
		789	loop_destroy (EV_P)
		790	{
		791	int i;
		792
		793	#if EV_USE_WIN32
		794	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		795	#endif
		796	#if EV_USE_KQUEUE
		797	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		798	#endif
		799	#if EV_USE_EPOLL
		800	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		801	#endif
		802	#if EV_USE_POLL
		803	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		804	#endif
		805	#if EV_USE_SELECT
		806	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		807	#endif
		808
		809	for (i = NUMPRI; i--; )
		810	array_free (pending, [i]);
		811
		812	/* have to use the microsoft-never-gets-it-right macro */
		813	array_free_microshit (fdchange);
		814	array_free_microshit (timer);
		815	#if EV_PERIODICS
		816	array_free_microshit (periodic);
		817	#endif
		818	array_free_microshit (idle);
		819	array_free_microshit (prepare);
		820	array_free_microshit (check);
		821
		822	method = 0;
		823	}
		824
		825	static void
		826	loop_fork (EV_P)
		827	{
		828	#if EV_USE_EPOLL
		829	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		830	#endif
		831	#if EV_USE_KQUEUE
		832	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		833	#endif
		834
		835	if (ev_is_active (&sigev))
		836	{
		837	/* default loop */
		838
		839	ev_ref (EV_A);
		840	ev_io_stop (EV_A_ &sigev);
		841	close (sigpipe [0]);
		842	close (sigpipe [1]);
		843
		844	while (pipe (sigpipe))
		845	syserr ("(libev) error creating pipe");
		846
		847	siginit (EV_A);
		848	}
		849
		850	postfork = 0;
		851	}
		852
		853	#if EV_MULTIPLICITY
		854	struct ev_loop *
		855	ev_loop_new (int methods)
		856	{
		857	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		858
		859	memset (loop, 0, sizeof (struct ev_loop));
		860
		861	loop_init (EV_A_ methods);
		862
		863	if (ev_method (EV_A))
		864	return loop;
		865
		866	return 0;
		867	}
		868
		869	void
		870	ev_loop_destroy (EV_P)
		871	{
		872	loop_destroy (EV_A);
		873	ev_free (loop);
		874	}
		875
		876	void
		877	ev_loop_fork (EV_P)
		878	{
		879	postfork = 1;
		880	}
		881
		882	#endif
		883
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *
		886	#else
		887	int
		888	#endif
		889	ev_default_loop (int methods)
		890	{
		891	if (sigpipe [0] == sigpipe [1])
317	if (pipe (sigpipe))	892	if (pipe (sigpipe))
318	return 0;	893	return 0;
319		894
320	ev_method = EVMETHOD_NONE;	895	if (!default_loop)
321	#if HAVE_EPOLL	896	{
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	897	#if EV_MULTIPLICITY
		898	struct ev_loop *loop = default_loop = &default_loop_struct;
		899	#else
		900	default_loop = 1;
323	#endif	901	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327		902
		903	loop_init (EV_A_ methods);
		904
		905	if (ev_method (EV_A))
		906	{
		907	siginit (EV_A);
		908
		909	#ifndef WIN32
		910	ev_signal_init (&childev, childcb, SIGCHLD);
		911	ev_set_priority (&childev, EV_MAXPRI);
		912	ev_signal_start (EV_A_ &childev);
		913	ev_unref (EV_A); /* child watcher should not keep loop alive */
		914	#endif
		915	}
		916	else
		917	default_loop = 0;
		918	}
		919
		920	return default_loop;
		921	}
		922
		923	void
		924	ev_default_destroy (void)
		925	{
		926	#if EV_MULTIPLICITY
		927	struct ev_loop *loop = default_loop;
		928	#endif
		929
		930	#ifndef WIN32
		931	ev_ref (EV_A); /* child watcher */
		932	ev_signal_stop (EV_A_ &childev);
		933	#endif
		934
		935	ev_ref (EV_A); /* signal watcher */
		936	ev_io_stop (EV_A_ &sigev);
		937
		938	close (sigpipe [0]); sigpipe [0] = 0;
		939	close (sigpipe [1]); sigpipe [1] = 0;
		940
		941	loop_destroy (EV_A);
		942	}
		943
		944	void
		945	ev_default_fork (void)
		946	{
		947	#if EV_MULTIPLICITY
		948	struct ev_loop *loop = default_loop;
		949	#endif
		950
328	if (ev_method)	951	if (method)
329	{	952	postfork = 1;
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}	953	}
336		954
337	/*****************************************************************************/	955	/*****************************************************************************/
338		956
339	void ev_prefork (void)
340	{
341	}
342
343	void ev_postfork_parent (void)
344	{
345	}
346
347	void ev_postfork_child (void)
348	{
349	#if HAVE_EPOLL
350	if (ev_method == EVMETHOD_EPOLL)
351	epoll_postfork_child ();
352	#endif
353
354	evio_stop (&sigev);
355	close (sigpipe [0]);
356	close (sigpipe [1]);
357	pipe (sigpipe);
358	siginit ();
359	}
360
361	/*****************************************************************************/
362
363	static void	957	static int
364	fd_reify (void)	958	any_pending (EV_P)
365	{	959	{
366	int i;	960	int pri;
367		961
368	for (i = 0; i < fdchangecnt; ++i)	962	for (pri = NUMPRI; pri--; )
369	{	963	if (pendingcnt [pri])
370	int fd = fdchanges [i];	964	return 1;
371	ANFD *anfd = anfds + fd;
372	struct ev_io *w;
373		965
374	int wev = 0;	966	return 0;
375
376	for (w = anfd->head; w; w = w->next)
377	wev \|= w->events;
378
379	if (anfd->wev != wev)
380	{
381	method_modify (fd, anfd->wev, wev);
382	anfd->wev = wev;
383	}
384	}
385
386	fdchangecnt = 0;
387	}	967	}
388		968
389	static void	969	static void
390	call_pending ()	970	call_pending (EV_P)
391	{	971	{
392	int i;	972	int pri;
393		973
394	for (i = 0; i < pendingcnt; ++i)	974	for (pri = NUMPRI; pri--; )
		975	while (pendingcnt [pri])
395	{	976	{
396	ANPENDING *p = pendings + i;	977	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
397		978
398	if (p->w)	979	if (p->w)
399	{	980	{
400	p->w->pending = 0;	981	p->w->pending = 0;
401	p->w->cb (p->w, p->events);	982	EV_CB_INVOKE (p->w, p->events);
402	}	983	}
403	}	984	}
404
405	pendingcnt = 0;
406	}	985	}
407		986
408	static void	987	static void
409	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	988	timers_reify (EV_P)
410	{	989	{
411	while (timercnt && timers [0]->at <= now)	990	while (timercnt && ((WT)timers [0])->at <= mn_now)
412	{	991	{
413	struct ev_timer *w = timers [0];	992	struct ev_timer *w = timers [0];
		993
		994	assert (("inactive timer on timer heap detected", ev_is_active (w)));
414		995
415	/* first reschedule or stop timer */	996	/* first reschedule or stop timer */
416	if (w->repeat)	997	if (w->repeat)
417	{	998	{
418	if (w->is_abs)	999	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
419	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1000
420	else
421	w->at = now + w->repeat;	1001	((WT)w)->at += w->repeat;
		1002	if (((WT)w)->at < mn_now)
		1003	((WT)w)->at = mn_now;
422		1004
423	assert (w->at > now);
424
425	downheap (timers, timercnt, 0);	1005	downheap ((WT *)timers, timercnt, 0);
426	}	1006	}
427	else	1007	else
		1008	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1009
		1010	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1011	}
		1012	}
		1013
		1014	#if EV_PERIODICS
		1015	static void
		1016	periodics_reify (EV_P)
		1017	{
		1018	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1019	{
		1020	struct ev_periodic *w = periodics [0];
		1021
		1022	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1023
		1024	/* first reschedule or stop timer */
		1025	if (w->reschedule_cb)
428	{	1026	{
429	evtimer_stop (w); /* nonrepeating: stop timer */	1027	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
430	--timercnt; /* maybe pass by reference instead? */	1028
		1029	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1030	downheap ((WT *)periodics, periodiccnt, 0);
431	}	1031	}
		1032	else if (w->interval)
		1033	{
		1034	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1035	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1036	downheap ((WT *)periodics, periodiccnt, 0);
		1037	}
		1038	else
		1039	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
432		1040
433	event ((W)w, EV_TIMEOUT);	1041	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
434	}	1042	}
435	}	1043	}
436		1044
437	static void	1045	static void
438	time_update ()	1046	periodics_reschedule (EV_P)
439	{	1047	{
440	int i;	1048	int i;
		1049
		1050	/* adjust periodics after time jump */
		1051	for (i = 0; i < periodiccnt; ++i)
		1052	{
		1053	struct ev_periodic *w = periodics [i];
		1054
		1055	if (w->reschedule_cb)
		1056	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1057	else if (w->interval)
		1058	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1059	}
		1060
		1061	/* now rebuild the heap */
		1062	for (i = periodiccnt >> 1; i--; )
		1063	downheap ((WT *)periodics, periodiccnt, i);
		1064	}
		1065	#endif
		1066
		1067	inline int
		1068	time_update_monotonic (EV_P)
		1069	{
		1070	mn_now = get_clock ();
		1071
		1072	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1073	{
		1074	ev_rt_now = rtmn_diff + mn_now;
		1075	return 0;
		1076	}
		1077	else
		1078	{
		1079	now_floor = mn_now;
441	ev_now = ev_time ();	1080	ev_rt_now = ev_time ();
442		1081	return 1;
443	if (have_monotonic)
444	{	1082	}
445	ev_tstamp odiff = diff;	1083	}
446		1084
447	/* detecting time jumps is much more difficult */	1085	static void
448	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1086	time_update (EV_P)
		1087	{
		1088	int i;
		1089
		1090	#if EV_USE_MONOTONIC
		1091	if (expect_true (have_monotonic))
		1092	{
		1093	if (time_update_monotonic (EV_A))
449	{	1094	{
450	now = get_clock ();	1095	ev_tstamp odiff = rtmn_diff;
		1096
		1097	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1098	{
451	diff = ev_now - now;	1099	rtmn_diff = ev_rt_now - mn_now;
452		1100
453	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1101	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
454	return; /* all is well */	1102	return; /* all is well */
455		1103
456	ev_now = ev_time ();	1104	ev_rt_now = ev_time ();
		1105	mn_now = get_clock ();
		1106	now_floor = mn_now;
		1107	}
		1108
		1109	# if EV_PERIODICS
		1110	periodics_reschedule (EV_A);
		1111	# endif
		1112	/* no timer adjustment, as the monotonic clock doesn't jump */
		1113	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
457	}	1114	}
		1115	}
		1116	else
		1117	#endif
		1118	{
		1119	ev_rt_now = ev_time ();
458		1120
459	/* time jump detected, reschedule atimers */	1121	if (expect_false (mn_now > ev_rt_now \|\| mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
460	for (i = 0; i < atimercnt; ++i)
461	{	1122	{
462	struct ev_timer *w = atimers [i];	1123	#if EV_PERIODICS
463	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1124	periodics_reschedule (EV_A);
		1125	#endif
		1126
		1127	/* adjust timers. this is easy, as the offset is the same for all */
		1128	for (i = 0; i < timercnt; ++i)
		1129	((WT)timers [i])->at += ev_rt_now - mn_now;
464	}	1130	}
465	}
466	else
467	{
468	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
469	/* time jump detected, adjust rtimers */
470	for (i = 0; i < rtimercnt; ++i)
471	rtimers [i]->at += ev_now - now;
472		1131
473	now = ev_now;	1132	mn_now = ev_rt_now;
474	}	1133	}
475	}	1134	}
476		1135
477	int ev_loop_done;	1136	void
		1137	ev_ref (EV_P)
		1138	{
		1139	++activecnt;
		1140	}
478		1141
		1142	void
		1143	ev_unref (EV_P)
		1144	{
		1145	--activecnt;
		1146	}
		1147
		1148	static int loop_done;
		1149
		1150	void
479	void ev_loop (int flags)	1151	ev_loop (EV_P_ int flags)
480	{	1152	{
481	double block;	1153	double block;
482	ev_loop_done = flags & EVLOOP_ONESHOT;	1154	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
483
484	if (checkcnt)
485	{
486	queue_events ((W *)checks, checkcnt, EV_CHECK);
487	call_pending ();
488	}
489		1155
490	do	1156	do
491	{	1157	{
		1158	/* queue check watchers (and execute them) */
		1159	if (expect_false (preparecnt))
		1160	{
		1161	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1162	call_pending (EV_A);
		1163	}
		1164
		1165	/* we might have forked, so reify kernel state if necessary */
		1166	if (expect_false (postfork))
		1167	loop_fork (EV_A);
		1168
492	/* update fd-related kernel structures */	1169	/* update fd-related kernel structures */
493	fd_reify ();	1170	fd_reify (EV_A);
494		1171
495	/* calculate blocking time */	1172	/* calculate blocking time */
		1173
		1174	/* we only need this for !monotonic clock or timers, but as we basically
		1175	always have timers, we just calculate it always */
		1176	#if EV_USE_MONOTONIC
		1177	if (expect_true (have_monotonic))
		1178	time_update_monotonic (EV_A);
		1179	else
		1180	#endif
		1181	{
		1182	ev_rt_now = ev_time ();
		1183	mn_now = ev_rt_now;
		1184	}
		1185
496	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1186	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
497	block = 0.;	1187	block = 0.;
498	else	1188	else
499	{	1189	{
500	block = MAX_BLOCKTIME;	1190	block = MAX_BLOCKTIME;
501		1191
502	if (rtimercnt)	1192	if (timercnt)
503	{	1193	{
504	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1194	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
505	if (block > to) block = to;	1195	if (block > to) block = to;
506	}	1196	}
507		1197
		1198	#if EV_PERIODICS
508	if (atimercnt)	1199	if (periodiccnt)
509	{	1200	{
510	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1201	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
511	if (block > to) block = to;	1202	if (block > to) block = to;
512	}	1203	}
		1204	#endif
513		1205
514	if (block < 0.) block = 0.;	1206	if (block < 0.) block = 0.;
515	}	1207	}
516		1208
517	method_poll (block);	1209	method_poll (EV_A_ block);
518		1210
519	/* update ev_now, do magic */	1211	/* update ev_rt_now, do magic */
520	time_update ();	1212	time_update (EV_A);
521		1213
522	/* queue pending timers and reschedule them */	1214	/* queue pending timers and reschedule them */
523	/* absolute timers first */	1215	timers_reify (EV_A); /* relative timers called last */
524	timers_reify (atimers, atimercnt, ev_now);	1216	#if EV_PERIODICS
525	/* relative timers second */	1217	periodics_reify (EV_A); /* absolute timers called first */
526	timers_reify (rtimers, rtimercnt, now);	1218	#endif
527		1219
528	/* queue idle watchers unless io or timers are pending */	1220	/* queue idle watchers unless io or timers are pending */
529	if (!pendingcnt)	1221	if (idlecnt && !any_pending (EV_A))
530	queue_events ((W *)idles, idlecnt, EV_IDLE);	1222	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
531		1223
532	/* queue check and possibly idle watchers */	1224	/* queue check watchers, to be executed first */
		1225	if (checkcnt)
533	queue_events ((W *)checks, checkcnt, EV_CHECK);	1226	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
534		1227
535	call_pending ();	1228	call_pending (EV_A);
536	}	1229	}
537	while (!ev_loop_done);	1230	while (activecnt && !loop_done);
		1231
		1232	if (loop_done != 2)
		1233	loop_done = 0;
		1234	}
		1235
		1236	void
		1237	ev_unloop (EV_P_ int how)
		1238	{
		1239	loop_done = how;
538	}	1240	}
539		1241
540	/*****************************************************************************/	1242	/*****************************************************************************/
541		1243
542	static void	1244	inline void
543	wlist_add (WL *head, WL elem)	1245	wlist_add (WL *head, WL elem)
544	{	1246	{
545	elem->next = *head;	1247	elem->next = *head;
546	*head = elem;	1248	*head = elem;
547	}	1249	}
548		1250
549	static void	1251	inline void
550	wlist_del (WL *head, WL elem)	1252	wlist_del (WL *head, WL elem)
551	{	1253	{
552	while (*head)	1254	while (*head)
553	{	1255	{
554	if (*head == elem)	1256	if (*head == elem)
559		1261
560	head = &(*head)->next;	1262	head = &(*head)->next;
561	}	1263	}
562	}	1264	}
563		1265
564	static void	1266	inline void
		1267	ev_clear_pending (EV_P_ W w)
		1268	{
		1269	if (w->pending)
		1270	{
		1271	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1272	w->pending = 0;
		1273	}
		1274	}
		1275
		1276	inline void
565	ev_start (W w, int active)	1277	ev_start (EV_P_ W w, int active)
566	{	1278	{
567	w->pending = 0;	1279	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1280	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1281
568	w->active = active;	1282	w->active = active;
		1283	ev_ref (EV_A);
569	}	1284	}
570		1285
571	static void	1286	inline void
572	ev_stop (W w)	1287	ev_stop (EV_P_ W w)
573	{	1288	{
574	if (w->pending)	1289	ev_unref (EV_A);
575	pendings [w->pending - 1].w = 0;
576
577	w->active = 0;	1290	w->active = 0;
578	/* nop */
579	}	1291	}
580		1292
581	/*****************************************************************************/	1293	/*****************************************************************************/
582		1294
583	void	1295	void
584	evio_start (struct ev_io *w)	1296	ev_io_start (EV_P_ struct ev_io *w)
585	{	1297	{
		1298	int fd = w->fd;
		1299
586	if (ev_is_active (w))	1300	if (ev_is_active (w))
587	return;	1301	return;
588		1302
589	int fd = w->fd;	1303	assert (("ev_io_start called with negative fd", fd >= 0));
590		1304
591	ev_start ((W)w, 1);	1305	ev_start (EV_A_ (W)w, 1);
592	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1306	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
593	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1307	wlist_add ((WL *)&anfds[fd].head, (WL)w);
594		1308
595	++fdchangecnt;	1309	fd_change (EV_A_ fd);
596	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
597	fdchanges [fdchangecnt - 1] = fd;
598	}	1310	}
599		1311
600	void	1312	void
601	evio_stop (struct ev_io *w)	1313	ev_io_stop (EV_P_ struct ev_io *w)
602	{	1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
603	if (!ev_is_active (w))	1316	if (!ev_is_active (w))
604	return;	1317	return;
605		1318
		1319	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1320
606	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1321	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
607	ev_stop ((W)w);	1322	ev_stop (EV_A_ (W)w);
608		1323
609	++fdchangecnt;	1324	fd_change (EV_A_ w->fd);
610	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
611	fdchanges [fdchangecnt - 1] = w->fd;
612	}	1325	}
613		1326
614	void	1327	void
615	evtimer_start (struct ev_timer *w)	1328	ev_timer_start (EV_P_ struct ev_timer *w)
616	{	1329	{
617	if (ev_is_active (w))	1330	if (ev_is_active (w))
618	return;	1331	return;
619		1332
620	if (w->is_abs)	1333	((WT)w)->at += mn_now;
		1334
		1335	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1336
		1337	ev_start (EV_A_ (W)w, ++timercnt);
		1338	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1339	timers [timercnt - 1] = w;
		1340	upheap ((WT *)timers, timercnt - 1);
		1341
		1342	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1343	}
		1344
		1345	void
		1346	ev_timer_stop (EV_P_ struct ev_timer *w)
		1347	{
		1348	ev_clear_pending (EV_A_ (W)w);
		1349	if (!ev_is_active (w))
		1350	return;
		1351
		1352	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1353
		1354	if (((W)w)->active < timercnt--)
		1355	{
		1356	timers [((W)w)->active - 1] = timers [timercnt];
		1357	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
621	{	1358	}
622	/* this formula differs from the one in timer_reify becuse we do not round up */	1359
		1360	((WT)w)->at -= mn_now;
		1361
		1362	ev_stop (EV_A_ (W)w);
		1363	}
		1364
		1365	void
		1366	ev_timer_again (EV_P_ struct ev_timer *w)
		1367	{
		1368	if (ev_is_active (w))
		1369	{
623	if (w->repeat)	1370	if (w->repeat)
624	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1371	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
625
626	ev_start ((W)w, ++atimercnt);
627	array_needsize (atimers, atimermax, atimercnt, );
628	atimers [atimercnt - 1] = w;
629	upheap (atimers, atimercnt - 1);
630	}
631	else	1372	else
		1373	ev_timer_stop (EV_A_ w);
632	{	1374	}
633	w->at += now;	1375	else if (w->repeat)
		1376	ev_timer_start (EV_A_ w);
		1377	}
634		1378
635	ev_start ((W)w, ++rtimercnt);	1379	#if EV_PERIODICS
636	array_needsize (rtimers, rtimermax, rtimercnt, );	1380	void
637	rtimers [rtimercnt - 1] = w;	1381	ev_periodic_start (EV_P_ struct ev_periodic *w)
638	upheap (rtimers, rtimercnt - 1);	1382	{
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	if (w->reschedule_cb)
		1387	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1388	else if (w->interval)
639	}	1389	{
		1390	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1391	/* this formula differs from the one in periodic_reify because we do not always round up */
		1392	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1393	}
640		1394
641	}	1395	ev_start (EV_A_ (W)w, ++periodiccnt);
		1396	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1397	periodics [periodiccnt - 1] = w;
		1398	upheap ((WT *)periodics, periodiccnt - 1);
642		1399
		1400	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1401	}
		1402
643	void	1403	void
644	evtimer_stop (struct ev_timer *w)	1404	ev_periodic_stop (EV_P_ struct ev_periodic *w)
645	{	1405	{
		1406	ev_clear_pending (EV_A_ (W)w);
646	if (!ev_is_active (w))	1407	if (!ev_is_active (w))
647	return;	1408	return;
648		1409
649	if (w->is_abs)	1410	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
650	{	1411
651	if (w->active < atimercnt--)	1412	if (((W)w)->active < periodiccnt--)
652	{
653	atimers [w->active - 1] = atimers [atimercnt];
654	downheap (atimers, atimercnt, w->active - 1);
655	}
656	}	1413	{
657	else	1414	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1415	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
658	{	1416	}
659	if (w->active < rtimercnt--)
660	{
661	rtimers [w->active - 1] = rtimers [rtimercnt];
662	downheap (rtimers, rtimercnt, w->active - 1);
663	}
664	}
665		1417
666	ev_stop ((W)w);	1418	ev_stop (EV_A_ (W)w);
667	}	1419	}
668		1420
669	void	1421	void
670	evsignal_start (struct ev_signal *w)	1422	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1423	{
		1424	/* TODO: use adjustheap and recalculation */
		1425	ev_periodic_stop (EV_A_ w);
		1426	ev_periodic_start (EV_A_ w);
		1427	}
		1428	#endif
		1429
		1430	void
		1431	ev_idle_start (EV_P_ struct ev_idle *w)
671	{	1432	{
672	if (ev_is_active (w))	1433	if (ev_is_active (w))
673	return;	1434	return;
674		1435
		1436	ev_start (EV_A_ (W)w, ++idlecnt);
		1437	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1438	idles [idlecnt - 1] = w;
		1439	}
		1440
		1441	void
		1442	ev_idle_stop (EV_P_ struct ev_idle *w)
		1443	{
		1444	ev_clear_pending (EV_A_ (W)w);
		1445	if (ev_is_active (w))
		1446	return;
		1447
		1448	idles [((W)w)->active - 1] = idles [--idlecnt];
		1449	ev_stop (EV_A_ (W)w);
		1450	}
		1451
		1452	void
		1453	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1454	{
		1455	if (ev_is_active (w))
		1456	return;
		1457
		1458	ev_start (EV_A_ (W)w, ++preparecnt);
		1459	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1460	prepares [preparecnt - 1] = w;
		1461	}
		1462
		1463	void
		1464	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1465	{
		1466	ev_clear_pending (EV_A_ (W)w);
		1467	if (ev_is_active (w))
		1468	return;
		1469
		1470	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1471	ev_stop (EV_A_ (W)w);
		1472	}
		1473
		1474	void
		1475	ev_check_start (EV_P_ struct ev_check *w)
		1476	{
		1477	if (ev_is_active (w))
		1478	return;
		1479
		1480	ev_start (EV_A_ (W)w, ++checkcnt);
		1481	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1482	checks [checkcnt - 1] = w;
		1483	}
		1484
		1485	void
		1486	ev_check_stop (EV_P_ struct ev_check *w)
		1487	{
		1488	ev_clear_pending (EV_A_ (W)w);
		1489	if (!ev_is_active (w))
		1490	return;
		1491
		1492	checks [((W)w)->active - 1] = checks [--checkcnt];
		1493	ev_stop (EV_A_ (W)w);
		1494	}
		1495
		1496	#ifndef SA_RESTART
		1497	# define SA_RESTART 0
		1498	#endif
		1499
		1500	void
		1501	ev_signal_start (EV_P_ struct ev_signal *w)
		1502	{
		1503	#if EV_MULTIPLICITY
		1504	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1505	#endif
		1506	if (ev_is_active (w))
		1507	return;
		1508
		1509	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1510
675	ev_start ((W)w, 1);	1511	ev_start (EV_A_ (W)w, 1);
676	array_needsize (signals, signalmax, w->signum, signals_init);	1512	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
677	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1513	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
678		1514
679	if (!w->next)	1515	if (!((WL)w)->next)
680	{	1516	{
		1517	#if WIN32
		1518	signal (w->signum, sighandler);
		1519	#else
681	struct sigaction sa;	1520	struct sigaction sa;
682	sa.sa_handler = sighandler;	1521	sa.sa_handler = sighandler;
683	sigfillset (&sa.sa_mask);	1522	sigfillset (&sa.sa_mask);
684	sa.sa_flags = 0;	1523	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
685	sigaction (w->signum, &sa, 0);	1524	sigaction (w->signum, &sa, 0);
		1525	#endif
686	}	1526	}
687	}	1527	}
688		1528
689	void	1529	void
690	evsignal_stop (struct ev_signal *w)	1530	ev_signal_stop (EV_P_ struct ev_signal *w)
691	{	1531	{
		1532	ev_clear_pending (EV_A_ (W)w);
692	if (!ev_is_active (w))	1533	if (!ev_is_active (w))
693	return;	1534	return;
694		1535
695	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1536	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
696	ev_stop ((W)w);	1537	ev_stop (EV_A_ (W)w);
697		1538
698	if (!signals [w->signum - 1].head)	1539	if (!signals [w->signum - 1].head)
699	signal (w->signum, SIG_DFL);	1540	signal (w->signum, SIG_DFL);
700	}	1541	}
701		1542
702	void evidle_start (struct ev_idle *w)	1543	void
		1544	ev_child_start (EV_P_ struct ev_child *w)
703	{	1545	{
		1546	#if EV_MULTIPLICITY
		1547	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1548	#endif
704	if (ev_is_active (w))	1549	if (ev_is_active (w))
705	return;	1550	return;
706		1551
707	ev_start ((W)w, ++idlecnt);	1552	ev_start (EV_A_ (W)w, 1);
708	array_needsize (idles, idlemax, idlecnt, );	1553	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
709	idles [idlecnt - 1] = w;
710	}	1554	}
711		1555
712	void evidle_stop (struct ev_idle *w)	1556	void
		1557	ev_child_stop (EV_P_ struct ev_child *w)
713	{	1558	{
714	idles [w->active - 1] = idles [--idlecnt];	1559	ev_clear_pending (EV_A_ (W)w);
715	ev_stop ((W)w);
716	}
717
718	void evcheck_start (struct ev_check *w)
719	{
720	if (ev_is_active (w))	1560	if (!ev_is_active (w))
721	return;	1561	return;
722		1562
723	ev_start ((W)w, ++checkcnt);	1563	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
724	array_needsize (checks, checkmax, checkcnt, );
725	checks [checkcnt - 1] = w;
726	}
727
728	void evcheck_stop (struct ev_check *w)
729	{
730	checks [w->active - 1] = checks [--checkcnt];
731	ev_stop ((W)w);	1564	ev_stop (EV_A_ (W)w);
732	}	1565	}
733		1566
734	/*****************************************************************************/	1567	/*****************************************************************************/
735		1568
736	#if 0	1569	struct ev_once
737
738	static void
739	sin_cb (struct ev_io *w, int revents)
740	{	1570	{
741	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
742	}
743
744	static void
745	ocb (struct ev_timer *w, int revents)
746	{
747	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
748	evtimer_stop (w);
749	evtimer_start (w);
750	}
751
752	static void
753	scb (struct ev_signal *w, int revents)
754	{
755	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
756	}
757
758	static void
759	gcb (struct ev_signal *w, int revents)
760	{
761	fprintf (stderr, "generic %x\n", revents);
762	}
763
764	int main (void)
765	{
766	struct ev_io sin;	1571	struct ev_io io;
767
768	ev_init (0);
769
770	evw_init (&sin, sin_cb, 55);
771	evio_set (&sin, 0, EV_READ);
772	evio_start (&sin);
773
774	struct ev_timer t[10000];
775
776	#if 0
777	int i;
778	for (i = 0; i < 10000; ++i)
779	{
780	struct ev_timer *w = t + i;
781	evw_init (w, ocb, i);
782	evtimer_set_abs (w, drand48 (), 0.99775533);
783	evtimer_start (w);
784	if (drand48 () < 0.5)
785	evtimer_stop (w);
786	}
787	#endif
788
789	struct ev_timer t1;	1572	struct ev_timer to;
790	evw_init (&t1, ocb, 0);	1573	void (cb)(int revents, void arg);
791	evtimer_set_abs (&t1, 5, 10);	1574	void *arg;
792	evtimer_start (&t1);	1575	};
793		1576
794	struct ev_signal sig;	1577	static void
795	evw_init (&sig, scb, 65535);	1578	once_cb (EV_P_ struct ev_once *once, int revents)
796	evsignal_set (&sig, SIGQUIT);	1579	{
797	evsignal_start (&sig);	1580	void (cb)(int revents, void arg) = once->cb;
		1581	void *arg = once->arg;
798		1582
799	struct ev_check cw;	1583	ev_io_stop (EV_A_ &once->io);
800	evw_init (&cw, gcb, 0);	1584	ev_timer_stop (EV_A_ &once->to);
801	evcheck_start (&cw);	1585	ev_free (once);
802		1586
803	struct ev_idle iw;	1587	cb (revents, arg);
804	evw_init (&iw, gcb, 0);
805	evidle_start (&iw);
806
807	ev_loop (0);
808
809	return 0;
810	}	1588	}
811		1589
812	#endif	1590	static void
		1591	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1592	{
		1593	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1594	}
813		1595
		1596	static void
		1597	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1598	{
		1599	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1600	}
814		1601
		1602	void
		1603	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1604	{
		1605	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
815		1606
		1607	if (!once)
		1608	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1609	else
		1610	{
		1611	once->cb = cb;
		1612	once->arg = arg;
816		1613
		1614	ev_init (&once->io, once_cb_io);
		1615	if (fd >= 0)
		1616	{
		1617	ev_io_set (&once->io, fd, events);
		1618	ev_io_start (EV_A_ &once->io);
		1619	}
		1620
		1621	ev_init (&once->to, once_cb_to);
		1622	if (timeout >= 0.)
		1623	{
		1624	ev_timer_set (&once->to, timeout, 0.);
		1625	ev_timer_start (EV_A_ &once->to);
		1626	}
		1627	}
		1628	}
		1629
		1630	#ifdef __cplusplus
		1631	}
		1632	#endif
		1633

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Comparing libev/ev.c (file contents): Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs. Revision 1.98 by root, Sun Nov 11 02:05:20 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.98 by root, Sun Nov 11 02:05:20 2007 UTC