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

Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.84 by root, Fri Nov 9 23:04:35 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>
3	#include <unistd.h>
4	#include <fcntl.h>	59	#include <fcntl.h>
5	#include <signal.h>	60	#include <stddef.h>
6		61
7	#include <stdio.h>	62	#include <stdio.h>
8		63
9	#include <assert.h>	64	#include <assert.h>
10	#include <errno.h>	65	#include <errno.h>
11	#include <sys/time.h>	66	#include <sys/types.h>
12	#include <time.h>	67	#include <time.h>
13		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
14	#ifndef HAVE_MONOTONIC	78	#ifndef EV_USE_MONOTONIC
15	# ifdef CLOCK_MONOTONIC
16	# define HAVE_MONOTONIC 1	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
17	# endif	105	# endif
18	#endif	106	#endif
19		107
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	108	#ifndef EV_USE_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	109	# define EV_USE_REALTIME 1
30	#endif	110	#endif
		111
		112	/**/
		113
		114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
		116	# define EV_USE_MONOTONIC 0
		117	#endif
		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
		121	# define EV_USE_REALTIME 0
		122	#endif
		123
		124	/**/
31		125
32	#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) */
33	#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 */
34		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
35	#include "ev.h"	134	# include "ev.h"
		135	#endif
36		136
37	struct ev_watcher {	137	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	138	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	139	# define inline inline
		140	#else
		141	# define expect(expr,value) (expr)
		142	# define inline static
		143	#endif
40		144
41	struct ev_watcher_list {	145	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	146	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	147
		148	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		149	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		150
45	typedef struct ev_watcher *W;	151	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	152	typedef struct ev_watcher_list *WL;
		153	typedef struct ev_watcher_time *WT;
47		154
48	static ev_tstamp now, diff; /* monotonic clock */	155	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
49	ev_tstamp ev_now;
50	int ev_method;
51		156
52	static int have_monotonic; /* runtime */	157	#include "ev_win32.c"
53
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		158
58	/*****************************************************************************/	159	/*****************************************************************************/
59		160
60	ev_tstamp	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	#define VAR(name,decl) decl;
		227	#include "ev_vars.h"
		228	#undef VAR
		229	};
		230	#include "ev_wrap.h"
		231
		232	struct ev_loop default_loop_struct;
		233	static struct ev_loop *default_loop;
		234
		235	#else
		236
		237	#define VAR(name,decl) static decl;
		238	#include "ev_vars.h"
		239	#undef VAR
		240
		241	static int default_loop;
		242
		243	#endif
		244
		245	/*****************************************************************************/
		246
		247	inline ev_tstamp
61	ev_time (void)	248	ev_time (void)
62	{	249	{
63	#if HAVE_REALTIME	250	#if EV_USE_REALTIME
64	struct timespec ts;	251	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	252	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	253	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	254	#else
68	struct timeval tv;	255	struct timeval tv;
69	gettimeofday (&tv, 0);	256	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	257	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	258	#endif
72	}	259	}
73		260
74	static ev_tstamp	261	inline ev_tstamp
75	get_clock (void)	262	get_clock (void)
76	{	263	{
77	#if HAVE_MONOTONIC	264	#if EV_USE_MONOTONIC
78	if (have_monotonic)	265	if (expect_true (have_monotonic))
79	{	266	{
80	struct timespec ts;	267	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	268	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	269	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	270	}
84	#endif	271	#endif
85		272
86	return ev_time ();	273	return ev_time ();
87	}	274	}
88		275
		276	ev_tstamp
		277	ev_now (EV_P)
		278	{
		279	return rt_now;
		280	}
		281
		282	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		283
89	#define array_needsize(base,cur,cnt,init) \	284	#define array_needsize(type,base,cur,cnt,init) \
90	if ((cnt) > cur) \	285	if (expect_false ((cnt) > cur)) \
91	{ \	286	{ \
92	int newcnt = cur ? cur << 1 : 16; \	287	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	288	do \
		289	{ \
		290	newcnt = array_roundsize (type, newcnt << 1); \
		291	} \
		292	while ((cnt) > newcnt); \
		293	\
94	base = realloc (base, sizeof (base) (newcnt)); \	294	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
95	init (base + cur, newcnt - cur); \	295	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	296	cur = newcnt; \
97	}	297	}
		298
		299	#define array_slim(type,stem) \
		300	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		301	{ \
		302	stem ## max = array_roundsize (stem ## cnt >> 1); \
		303	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		304	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		305	}
		306
		307	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		308	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		309	#define array_free_microshit(stem) \
		310	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		311
		312	#define array_free(stem, idx) \
		313	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		314
99	/*****************************************************************************/	315	/*****************************************************************************/
100		316
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	317	static void
114	anfds_init (ANFD *base, int count)	318	anfds_init (ANFD *base, int count)
115	{	319	{
116	while (count--)	320	while (count--)
117	{	321	{
118	base->head = 0;	322	base->head = 0;
119	base->wev = base->rev = EV_NONE;	323	base->events = EV_NONE;
		324	base->reify = 0;
		325
120	++base;	326	++base;
121	}	327	}
122	}	328	}
123		329
124	typedef struct	330	void
		331	ev_feed_event (EV_P_ void *w, int revents)
125	{	332	{
126	W w;	333	W w_ = (W)w;
127	int events;
128	} ANPENDING;
129		334
130	static ANPENDING *pendings;	335	if (w_->pending)
131	static int pendingmax, pendingcnt;	336	{
		337	pendings [ABSPRI (w_)][w_->pending - 1].events \|= revents;
		338	return;
		339	}
132		340
133	static void
134	event (W w, int events)
135	{
136	w->pending = ++pendingcnt;	341	w_->pending = ++pendingcnt [ABSPRI (w_)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	342	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
138	pendings [pendingcnt - 1].w = w;	343	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
139	pendings [pendingcnt - 1].events = events;	344	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
140	}	345	}
141		346
142	static void	347	static void
		348	queue_events (EV_P_ W *events, int eventcnt, int type)
		349	{
		350	int i;
		351
		352	for (i = 0; i < eventcnt; ++i)
		353	ev_feed_event (EV_A_ events [i], type);
		354	}
		355
		356	inline void
143	fd_event (int fd, int events)	357	fd_event (EV_P_ int fd, int revents)
144	{	358	{
145	ANFD *anfd = anfds + fd;	359	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	360	struct ev_io *w;
147		361
148	for (w = anfd->head; w; w = w->next)	362	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
149	{	363	{
150	int ev = w->events & events;	364	int ev = w->events & revents;
151		365
152	if (ev)	366	if (ev)
153	event ((W)w, ev);	367	ev_feed_event (EV_A_ (W)w, ev);
154	}	368	}
155	}	369	}
156		370
		371	void
		372	ev_feed_fd_event (EV_P_ int fd, int revents)
		373	{
		374	fd_event (EV_A_ fd, revents);
		375	}
		376
		377	/*****************************************************************************/
		378
157	static void	379	static void
158	queue_events (W *events, int eventcnt, int type)	380	fd_reify (EV_P)
159	{	381	{
160	int i;	382	int i;
161		383
162	for (i = 0; i < eventcnt; ++i)	384	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	385	{
		386	int fd = fdchanges [i];
		387	ANFD *anfd = anfds + fd;
		388	struct ev_io *w;
		389
		390	int events = 0;
		391
		392	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		393	events \|= w->events;
		394
		395	anfd->reify = 0;
		396
		397	method_modify (EV_A_ fd, anfd->events, events);
		398	anfd->events = events;
		399	}
		400
		401	fdchangecnt = 0;
		402	}
		403
		404	static void
		405	fd_change (EV_P_ int fd)
		406	{
		407	if (anfds [fd].reify)
		408	return;
		409
		410	anfds [fd].reify = 1;
		411
		412	++fdchangecnt;
		413	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		414	fdchanges [fdchangecnt - 1] = fd;
		415	}
		416
		417	static void
		418	fd_kill (EV_P_ int fd)
		419	{
		420	struct ev_io *w;
		421
		422	while ((w = (struct ev_io *)anfds [fd].head))
		423	{
		424	ev_io_stop (EV_A_ w);
		425	ev_feed_event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		426	}
		427	}
		428
		429	static int
		430	fd_valid (int fd)
		431	{
		432	#ifdef WIN32
		433	return !!win32_get_osfhandle (fd);
		434	#else
		435	return fcntl (fd, F_GETFD) != -1;
		436	#endif
		437	}
		438
		439	/* called on EBADF to verify fds */
		440	static void
		441	fd_ebadf (EV_P)
		442	{
		443	int fd;
		444
		445	for (fd = 0; fd < anfdmax; ++fd)
		446	if (anfds [fd].events)
		447	if (!fd_valid (fd) == -1 && errno == EBADF)
		448	fd_kill (EV_A_ fd);
		449	}
		450
		451	/* called on ENOMEM in select/poll to kill some fds and retry */
		452	static void
		453	fd_enomem (EV_P)
		454	{
		455	int fd;
		456
		457	for (fd = anfdmax; fd--; )
		458	if (anfds [fd].events)
		459	{
		460	fd_kill (EV_A_ fd);
		461	return;
		462	}
		463	}
		464
		465	/* usually called after fork if method needs to re-arm all fds from scratch */
		466	static void
		467	fd_rearm_all (EV_P)
		468	{
		469	int fd;
		470
		471	/* this should be highly optimised to not do anything but set a flag */
		472	for (fd = 0; fd < anfdmax; ++fd)
		473	if (anfds [fd].events)
		474	{
		475	anfds [fd].events = 0;
		476	fd_change (EV_A_ fd);
		477	}
164	}	478	}
165		479
166	/*****************************************************************************/	480	/*****************************************************************************/
167		481
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	482	static void
175	upheap (struct ev_timer **timers, int k)	483	upheap (WT *heap, int k)
176	{	484	{
177	struct ev_timer *w = timers [k];	485	WT w = heap [k];
178		486
179	while (k && timers [k >> 1]->at > w->at)	487	while (k && heap [k >> 1]->at > w->at)
180	{	488	{
181	timers [k] = timers [k >> 1];	489	heap [k] = heap [k >> 1];
182	timers [k]->active = k + 1;	490	((W)heap [k])->active = k + 1;
183	k >>= 1;	491	k >>= 1;
184	}	492	}
185		493
186	timers [k] = w;	494	heap [k] = w;
187	timers [k]->active = k + 1;	495	((W)heap [k])->active = k + 1;
188		496
189	}	497	}
190		498
191	static void	499	static void
192	downheap (struct ev_timer **timers, int N, int k)	500	downheap (WT *heap, int N, int k)
193	{	501	{
194	struct ev_timer *w = timers [k];	502	WT w = heap [k];
195		503
196	while (k < (N >> 1))	504	while (k < (N >> 1))
197	{	505	{
198	int j = k << 1;	506	int j = k << 1;
199		507
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	508	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
201	++j;	509	++j;
202		510
203	if (w->at <= timers [j]->at)	511	if (w->at <= heap [j]->at)
204	break;	512	break;
205		513
206	timers [k] = timers [j];	514	heap [k] = heap [j];
207	timers [k]->active = k + 1;	515	((W)heap [k])->active = k + 1;
208	k = j;	516	k = j;
209	}	517	}
210		518
211	timers [k] = w;	519	heap [k] = w;
212	timers [k]->active = k + 1;	520	((W)heap [k])->active = k + 1;
		521	}
		522
		523	inline void
		524	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		525	{
		526	ev_tstamp old_at = heap [k]->at;
		527	heap [k]->at = at;
		528
		529	if (old_at < at)
		530	downheap (heap, N, k);
		531	else
		532	upheap (heap, k);
213	}	533	}
214		534
215	/*****************************************************************************/	535	/*****************************************************************************/
216		536
217	typedef struct	537	typedef struct
218	{	538	{
219	struct ev_signal *head;	539	WL head;
220	sig_atomic_t gotsig;	540	sig_atomic_t volatile gotsig;
221	} ANSIG;	541	} ANSIG;
222		542
223	static ANSIG *signals;	543	static ANSIG *signals;
224	static int signalmax;	544	static int signalmax;
225		545
226	static int sigpipe [2];	546	static int sigpipe [2];
227	static sig_atomic_t gotsig;	547	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	548	static struct ev_io sigev;
229		549
230	static void	550	static void
231	signals_init (ANSIG *base, int count)	551	signals_init (ANSIG *base, int count)
232	{	552	{
233	while (count--)	553	while (count--)
234	{	554	{
235	base->head = 0;	555	base->head = 0;
236	base->gotsig = 0;	556	base->gotsig = 0;
		557
237	++base;	558	++base;
238	}	559	}
239	}	560	}
240		561
241	static void	562	static void
242	sighandler (int signum)	563	sighandler (int signum)
243	{	564	{
		565	#if WIN32
		566	signal (signum, sighandler);
		567	#endif
		568
244	signals [signum - 1].gotsig = 1;	569	signals [signum - 1].gotsig = 1;
245		570
246	if (!gotsig)	571	if (!gotsig)
247	{	572	{
		573	int old_errno = errno;
248	gotsig = 1;	574	gotsig = 1;
		575	#ifdef WIN32
		576	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		577	#else
249	write (sigpipe [1], &gotsig, 1);	578	write (sigpipe [1], &signum, 1);
		579	#endif
		580	errno = old_errno;
250	}	581	}
251	}	582	}
252		583
		584	void
		585	ev_feed_signal_event (EV_P_ int signum)
		586	{
		587	WL w;
		588
		589	#if EV_MULTIPLICITY
		590	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		591	#endif
		592
		593	--signum;
		594
		595	if (signum < 0 \|\| signum >= signalmax)
		596	return;
		597
		598	signals [signum].gotsig = 0;
		599
		600	for (w = signals [signum].head; w; w = w->next)
		601	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		602	}
		603
253	static void	604	static void
254	sigcb (struct ev_io *iow, int revents)	605	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	606	{
256	struct ev_signal *w;
257	int sig;	607	int signum;
258		608
		609	#ifdef WIN32
		610	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		611	#else
		612	read (sigpipe [0], &revents, 1);
		613	#endif
259	gotsig = 0;	614	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		615
262	for (sig = signalmax; sig--; )	616	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	617	if (signals [signum].gotsig)
264	{	618	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	}	619	}
271		620
272	static void	621	static void
273	siginit (void)	622	siginit (EV_P)
274	{	623	{
		624	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	625	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	626	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		627
278	/* rather than sort out wether we really need nb, set it */	628	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	629	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	630	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		631	#endif
281		632
282	evio_set (&sigev, sigpipe [0], EV_READ);	633	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	634	ev_io_start (EV_A_ &sigev);
		635	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	636	}
285		637
286	/*****************************************************************************/	638	/*****************************************************************************/
287		639
288	static struct ev_idle **idles;	640	static struct ev_child *childs [PID_HASHSIZE];
289	static int idlemax, idlecnt;
290		641
291	static struct ev_check **checks;	642	#ifndef WIN32
292	static int checkmax, checkcnt;	643
		644	static struct ev_signal childev;
		645
		646	#ifndef WCONTINUED
		647	# define WCONTINUED 0
		648	#endif
		649
		650	static void
		651	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		652	{
		653	struct ev_child *w;
		654
		655	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		656	if (w->pid == pid \|\| !w->pid)
		657	{
		658	ev_priority (w) = ev_priority (sw); /* need to do it now */
		659	w->rpid = pid;
		660	w->rstatus = status;
		661	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		662	}
		663	}
		664
		665	static void
		666	childcb (EV_P_ struct ev_signal *sw, int revents)
		667	{
		668	int pid, status;
		669
		670	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		671	{
		672	/* make sure we are called again until all childs have been reaped */
		673	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		674
		675	child_reap (EV_A_ sw, pid, pid, status);
		676	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		677	}
		678	}
		679
		680	#endif
293		681
294	/*****************************************************************************/	682	/*****************************************************************************/
295		683
		684	#if EV_USE_KQUEUE
		685	# include "ev_kqueue.c"
		686	#endif
296	#if HAVE_EPOLL	687	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	688	# include "ev_epoll.c"
298	#endif	689	#endif
		690	#if EV_USE_POLL
		691	# include "ev_poll.c"
		692	#endif
299	#if HAVE_SELECT	693	#if EV_USE_SELECT
300	# include "ev_select.c"	694	# include "ev_select.c"
301	#endif	695	#endif
302		696
303	int ev_init (int flags)	697	int
		698	ev_version_major (void)
304	{	699	{
		700	return EV_VERSION_MAJOR;
		701	}
		702
		703	int
		704	ev_version_minor (void)
		705	{
		706	return EV_VERSION_MINOR;
		707	}
		708
		709	/* return true if we are running with elevated privileges and should ignore env variables */
		710	static int
		711	enable_secure (void)
		712	{
		713	#ifdef WIN32
		714	return 0;
		715	#else
		716	return getuid () != geteuid ()
		717	\|\| getgid () != getegid ();
		718	#endif
		719	}
		720
		721	int
		722	ev_method (EV_P)
		723	{
		724	return method;
		725	}
		726
		727	static void
		728	loop_init (EV_P_ int methods)
		729	{
		730	if (!method)
		731	{
305	#if HAVE_MONOTONIC	732	#if EV_USE_MONOTONIC
306	{	733	{
307	struct timespec ts;	734	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	735	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	736	have_monotonic = 1;
310	}	737	}
311	#endif	738	#endif
312		739
313	ev_now = ev_time ();	740	rt_now = ev_time ();
314	now = get_clock ();	741	mn_now = get_clock ();
315	diff = ev_now - now;	742	now_floor = mn_now;
		743	rtmn_diff = rt_now - mn_now;
316		744
		745	if (methods == EVMETHOD_AUTO)
		746	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		747	methods = atoi (getenv ("LIBEV_METHODS"));
		748	else
		749	methods = EVMETHOD_ANY;
		750
		751	method = 0;
		752	#if EV_USE_WIN32
		753	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		754	#endif
		755	#if EV_USE_KQUEUE
		756	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		757	#endif
		758	#if EV_USE_EPOLL
		759	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		760	#endif
		761	#if EV_USE_POLL
		762	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		763	#endif
		764	#if EV_USE_SELECT
		765	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		766	#endif
		767
		768	ev_init (&sigev, sigcb);
		769	ev_set_priority (&sigev, EV_MAXPRI);
		770	}
		771	}
		772
		773	void
		774	loop_destroy (EV_P)
		775	{
		776	int i;
		777
		778	#if EV_USE_WIN32
		779	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		780	#endif
		781	#if EV_USE_KQUEUE
		782	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		783	#endif
		784	#if EV_USE_EPOLL
		785	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		786	#endif
		787	#if EV_USE_POLL
		788	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		789	#endif
		790	#if EV_USE_SELECT
		791	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		792	#endif
		793
		794	for (i = NUMPRI; i--; )
		795	array_free (pending, [i]);
		796
		797	/* have to use the microsoft-never-gets-it-right macro */
		798	array_free_microshit (fdchange);
		799	array_free_microshit (timer);
		800	array_free_microshit (periodic);
		801	array_free_microshit (idle);
		802	array_free_microshit (prepare);
		803	array_free_microshit (check);
		804
		805	method = 0;
		806	}
		807
		808	static void
		809	loop_fork (EV_P)
		810	{
		811	#if EV_USE_EPOLL
		812	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		813	#endif
		814	#if EV_USE_KQUEUE
		815	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		816	#endif
		817
		818	if (ev_is_active (&sigev))
		819	{
		820	/* default loop */
		821
		822	ev_ref (EV_A);
		823	ev_io_stop (EV_A_ &sigev);
		824	close (sigpipe [0]);
		825	close (sigpipe [1]);
		826
		827	while (pipe (sigpipe))
		828	syserr ("(libev) error creating pipe");
		829
		830	siginit (EV_A);
		831	}
		832
		833	postfork = 0;
		834	}
		835
		836	#if EV_MULTIPLICITY
		837	struct ev_loop *
		838	ev_loop_new (int methods)
		839	{
		840	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		841
		842	memset (loop, 0, sizeof (struct ev_loop));
		843
		844	loop_init (EV_A_ methods);
		845
		846	if (ev_method (EV_A))
		847	return loop;
		848
		849	return 0;
		850	}
		851
		852	void
		853	ev_loop_destroy (EV_P)
		854	{
		855	loop_destroy (EV_A);
		856	ev_free (loop);
		857	}
		858
		859	void
		860	ev_loop_fork (EV_P)
		861	{
		862	postfork = 1;
		863	}
		864
		865	#endif
		866
		867	#if EV_MULTIPLICITY
		868	struct ev_loop *
		869	#else
		870	int
		871	#endif
		872	ev_default_loop (int methods)
		873	{
		874	if (sigpipe [0] == sigpipe [1])
317	if (pipe (sigpipe))	875	if (pipe (sigpipe))
318	return 0;	876	return 0;
319		877
320	ev_method = EVMETHOD_NONE;	878	if (!default_loop)
321	#if HAVE_EPOLL	879	{
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	880	#if EV_MULTIPLICITY
		881	struct ev_loop *loop = default_loop = &default_loop_struct;
		882	#else
		883	default_loop = 1;
323	#endif	884	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327		885
		886	loop_init (EV_A_ methods);
		887
		888	if (ev_method (EV_A))
		889	{
		890	siginit (EV_A);
		891
		892	#ifndef WIN32
		893	ev_signal_init (&childev, childcb, SIGCHLD);
		894	ev_set_priority (&childev, EV_MAXPRI);
		895	ev_signal_start (EV_A_ &childev);
		896	ev_unref (EV_A); /* child watcher should not keep loop alive */
		897	#endif
		898	}
		899	else
		900	default_loop = 0;
		901	}
		902
		903	return default_loop;
		904	}
		905
		906	void
		907	ev_default_destroy (void)
		908	{
		909	#if EV_MULTIPLICITY
		910	struct ev_loop *loop = default_loop;
		911	#endif
		912
		913	#ifndef WIN32
		914	ev_ref (EV_A); /* child watcher */
		915	ev_signal_stop (EV_A_ &childev);
		916	#endif
		917
		918	ev_ref (EV_A); /* signal watcher */
		919	ev_io_stop (EV_A_ &sigev);
		920
		921	close (sigpipe [0]); sigpipe [0] = 0;
		922	close (sigpipe [1]); sigpipe [1] = 0;
		923
		924	loop_destroy (EV_A);
		925	}
		926
		927	void
		928	ev_default_fork (void)
		929	{
		930	#if EV_MULTIPLICITY
		931	struct ev_loop *loop = default_loop;
		932	#endif
		933
328	if (ev_method)	934	if (method)
329	{	935	postfork = 1;
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}	936	}
336		937
337	/*****************************************************************************/	938	/*****************************************************************************/
338		939
339	void ev_prefork (void)
340	{
341	/* nop */
342	}
343
344	void ev_postfork_parent (void)
345	{
346	/* nop */
347	}
348
349	void ev_postfork_child (void)
350	{
351	#if HAVE_EPOLL
352	if (ev_method == EVMETHOD_EPOLL)
353	epoll_postfork_child ();
354	#endif
355
356	evio_stop (&sigev);
357	close (sigpipe [0]);
358	close (sigpipe [1]);
359	pipe (sigpipe);
360	siginit ();
361	}
362
363	/*****************************************************************************/
364
365	static void	940	static int
366	fd_reify (void)	941	any_pending (EV_P)
367	{	942	{
368	int i;	943	int pri;
369		944
370	for (i = 0; i < fdchangecnt; ++i)	945	for (pri = NUMPRI; pri--; )
371	{	946	if (pendingcnt [pri])
372	int fd = fdchanges [i];	947	return 1;
373	ANFD *anfd = anfds + fd;
374	struct ev_io *w;
375		948
376	int wev = 0;	949	return 0;
377
378	for (w = anfd->head; w; w = w->next)
379	wev \|= w->events;
380
381	if (anfd->wev != wev)
382	{
383	method_modify (fd, anfd->wev, wev);
384	anfd->wev = wev;
385	}
386	}
387
388	fdchangecnt = 0;
389	}	950	}
390		951
391	static void	952	static void
392	call_pending ()	953	call_pending (EV_P)
393	{	954	{
394	int i;	955	int pri;
395		956
396	for (i = 0; i < pendingcnt; ++i)	957	for (pri = NUMPRI; pri--; )
		958	while (pendingcnt [pri])
397	{	959	{
398	ANPENDING *p = pendings + i;	960	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
399		961
400	if (p->w)	962	if (p->w)
401	{	963	{
402	p->w->pending = 0;	964	p->w->pending = 0;
403	p->w->cb (p->w, p->events);	965	EV_CB_INVOKE (p->w, p->events);
404	}	966	}
405	}	967	}
406
407	pendingcnt = 0;
408	}	968	}
409		969
410	static void	970	static void
411	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	971	timers_reify (EV_P)
412	{	972	{
413	while (timercnt && timers [0]->at <= now)	973	while (timercnt && ((WT)timers [0])->at <= mn_now)
414	{	974	{
415	struct ev_timer *w = timers [0];	975	struct ev_timer *w = timers [0];
		976
		977	assert (("inactive timer on timer heap detected", ev_is_active (w)));
416		978
417	/* first reschedule or stop timer */	979	/* first reschedule or stop timer */
418	if (w->repeat)	980	if (w->repeat)
419	{	981	{
420	if (w->is_abs)	982	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
421	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
422	else
423	w->at = now + w->repeat;	983	((WT)w)->at = mn_now + w->repeat;
424
425	assert (w->at > now);
426
427	downheap (timers, timercnt, 0);	984	downheap ((WT *)timers, timercnt, 0);
428	}	985	}
429	else	986	else
		987	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		988
		989	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		990	}
		991	}
		992
		993	static void
		994	periodics_reify (EV_P)
		995	{
		996	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		997	{
		998	struct ev_periodic *w = periodics [0];
		999
		1000	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1001
		1002	/* first reschedule or stop timer */
		1003	if (w->reschedule_cb)
430	{	1004	{
431	evtimer_stop (w); /* nonrepeating: stop timer */	1005	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
432	--timercnt; /* maybe pass by reference instead? */	1006
		1007	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		1008	downheap ((WT *)periodics, periodiccnt, 0);
433	}	1009	}
		1010	else if (w->interval)
		1011	{
		1012	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1013	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		1014	downheap ((WT *)periodics, periodiccnt, 0);
		1015	}
		1016	else
		1017	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
434		1018
435	event ((W)w, EV_TIMEOUT);	1019	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
436	}	1020	}
437	}	1021	}
438		1022
439	static void	1023	static void
440	time_update ()	1024	periodics_reschedule (EV_P)
441	{	1025	{
442	int i;	1026	int i;
		1027
		1028	/* adjust periodics after time jump */
		1029	for (i = 0; i < periodiccnt; ++i)
		1030	{
		1031	struct ev_periodic *w = periodics [i];
		1032
		1033	if (w->reschedule_cb)
		1034	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1035	else if (w->interval)
		1036	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1037	}
		1038
		1039	/* now rebuild the heap */
		1040	for (i = periodiccnt >> 1; i--; )
		1041	downheap ((WT *)periodics, periodiccnt, i);
		1042	}
		1043
		1044	inline int
		1045	time_update_monotonic (EV_P)
		1046	{
		1047	mn_now = get_clock ();
		1048
		1049	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1050	{
		1051	rt_now = rtmn_diff + mn_now;
		1052	return 0;
		1053	}
		1054	else
		1055	{
		1056	now_floor = mn_now;
443	ev_now = ev_time ();	1057	rt_now = ev_time ();
444		1058	return 1;
445	if (have_monotonic)
446	{	1059	}
447	ev_tstamp odiff = diff;	1060	}
448		1061
449	/* detecting time jumps is much more difficult */	1062	static void
450	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1063	time_update (EV_P)
		1064	{
		1065	int i;
		1066
		1067	#if EV_USE_MONOTONIC
		1068	if (expect_true (have_monotonic))
		1069	{
		1070	if (time_update_monotonic (EV_A))
451	{	1071	{
452	now = get_clock ();	1072	ev_tstamp odiff = rtmn_diff;
		1073
		1074	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1075	{
453	diff = ev_now - now;	1076	rtmn_diff = rt_now - mn_now;
454		1077
455	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1078	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
456	return; /* all is well */	1079	return; /* all is well */
457		1080
458	ev_now = ev_time ();	1081	rt_now = ev_time ();
		1082	mn_now = get_clock ();
		1083	now_floor = mn_now;
		1084	}
		1085
		1086	periodics_reschedule (EV_A);
		1087	/* no timer adjustment, as the monotonic clock doesn't jump */
		1088	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
459	}	1089	}
		1090	}
		1091	else
		1092	#endif
		1093	{
		1094	rt_now = ev_time ();
460		1095
461	/* time jump detected, reschedule atimers */	1096	if (expect_false (mn_now > rt_now \|\| mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
462	for (i = 0; i < atimercnt; ++i)
463	{	1097	{
464	struct ev_timer *w = atimers [i];	1098	periodics_reschedule (EV_A);
465	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1099
		1100	/* adjust timers. this is easy, as the offset is the same for all */
		1101	for (i = 0; i < timercnt; ++i)
		1102	((WT)timers [i])->at += rt_now - mn_now;
466	}	1103	}
467	}
468	else
469	{
470	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
471	/* time jump detected, adjust rtimers */
472	for (i = 0; i < rtimercnt; ++i)
473	rtimers [i]->at += ev_now - now;
474		1104
475	now = ev_now;	1105	mn_now = rt_now;
476	}	1106	}
477	}	1107	}
478		1108
479	int ev_loop_done;	1109	void
		1110	ev_ref (EV_P)
		1111	{
		1112	++activecnt;
		1113	}
480		1114
		1115	void
		1116	ev_unref (EV_P)
		1117	{
		1118	--activecnt;
		1119	}
		1120
		1121	static int loop_done;
		1122
		1123	void
481	void ev_loop (int flags)	1124	ev_loop (EV_P_ int flags)
482	{	1125	{
483	double block;	1126	double block;
484	ev_loop_done = flags & EVLOOP_ONESHOT;	1127	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
485
486	if (checkcnt)
487	{
488	queue_events ((W *)checks, checkcnt, EV_CHECK);
489	call_pending ();
490	}
491		1128
492	do	1129	do
493	{	1130	{
		1131	/* queue check watchers (and execute them) */
		1132	if (expect_false (preparecnt))
		1133	{
		1134	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1135	call_pending (EV_A);
		1136	}
		1137
		1138	/* we might have forked, so reify kernel state if necessary */
		1139	if (expect_false (postfork))
		1140	loop_fork (EV_A);
		1141
494	/* update fd-related kernel structures */	1142	/* update fd-related kernel structures */
495	fd_reify ();	1143	fd_reify (EV_A);
496		1144
497	/* calculate blocking time */	1145	/* calculate blocking time */
		1146
		1147	/* we only need this for !monotonic clock or timers, but as we basically
		1148	always have timers, we just calculate it always */
		1149	#if EV_USE_MONOTONIC
		1150	if (expect_true (have_monotonic))
		1151	time_update_monotonic (EV_A);
		1152	else
		1153	#endif
		1154	{
		1155	rt_now = ev_time ();
		1156	mn_now = rt_now;
		1157	}
		1158
498	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1159	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
499	block = 0.;	1160	block = 0.;
500	else	1161	else
501	{	1162	{
502	block = MAX_BLOCKTIME;	1163	block = MAX_BLOCKTIME;
503		1164
504	if (rtimercnt)	1165	if (timercnt)
505	{	1166	{
506	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1167	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
507	if (block > to) block = to;	1168	if (block > to) block = to;
508	}	1169	}
509		1170
510	if (atimercnt)	1171	if (periodiccnt)
511	{	1172	{
512	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1173	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
513	if (block > to) block = to;	1174	if (block > to) block = to;
514	}	1175	}
515		1176
516	if (block < 0.) block = 0.;	1177	if (block < 0.) block = 0.;
517	}	1178	}
518		1179
519	method_poll (block);	1180	method_poll (EV_A_ block);
520		1181
521	/* update ev_now, do magic */	1182	/* update rt_now, do magic */
522	time_update ();	1183	time_update (EV_A);
523		1184
524	/* queue pending timers and reschedule them */	1185	/* queue pending timers and reschedule them */
525	/* absolute timers first */	1186	timers_reify (EV_A); /* relative timers called last */
526	timers_reify (atimers, atimercnt, ev_now);	1187	periodics_reify (EV_A); /* absolute timers called first */
527	/* relative timers second */
528	timers_reify (rtimers, rtimercnt, now);
529		1188
530	/* queue idle watchers unless io or timers are pending */	1189	/* queue idle watchers unless io or timers are pending */
531	if (!pendingcnt)	1190	if (idlecnt && !any_pending (EV_A))
532	queue_events ((W *)idles, idlecnt, EV_IDLE);	1191	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
533		1192
534	/* queue check and possibly idle watchers */	1193	/* queue check watchers, to be executed first */
		1194	if (checkcnt)
535	queue_events ((W *)checks, checkcnt, EV_CHECK);	1195	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
536		1196
537	call_pending ();	1197	call_pending (EV_A);
538	}	1198	}
539	while (!ev_loop_done);	1199	while (activecnt && !loop_done);
		1200
		1201	if (loop_done != 2)
		1202	loop_done = 0;
		1203	}
		1204
		1205	void
		1206	ev_unloop (EV_P_ int how)
		1207	{
		1208	loop_done = how;
540	}	1209	}
541		1210
542	/*****************************************************************************/	1211	/*****************************************************************************/
543		1212
544	static void	1213	inline void
545	wlist_add (WL *head, WL elem)	1214	wlist_add (WL *head, WL elem)
546	{	1215	{
547	elem->next = *head;	1216	elem->next = *head;
548	*head = elem;	1217	*head = elem;
549	}	1218	}
550		1219
551	static void	1220	inline void
552	wlist_del (WL *head, WL elem)	1221	wlist_del (WL *head, WL elem)
553	{	1222	{
554	while (*head)	1223	while (*head)
555	{	1224	{
556	if (*head == elem)	1225	if (*head == elem)
561		1230
562	head = &(*head)->next;	1231	head = &(*head)->next;
563	}	1232	}
564	}	1233	}
565		1234
566	static void	1235	inline void
		1236	ev_clear_pending (EV_P_ W w)
		1237	{
		1238	if (w->pending)
		1239	{
		1240	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1241	w->pending = 0;
		1242	}
		1243	}
		1244
		1245	inline void
567	ev_start (W w, int active)	1246	ev_start (EV_P_ W w, int active)
568	{	1247	{
569	w->pending = 0;	1248	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1249	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1250
570	w->active = active;	1251	w->active = active;
		1252	ev_ref (EV_A);
571	}	1253	}
572		1254
573	static void	1255	inline void
574	ev_stop (W w)	1256	ev_stop (EV_P_ W w)
575	{	1257	{
576	if (w->pending)	1258	ev_unref (EV_A);
577	pendings [w->pending - 1].w = 0;
578
579	w->active = 0;	1259	w->active = 0;
580	}	1260	}
581		1261
582	/*****************************************************************************/	1262	/*****************************************************************************/
583		1263
584	void	1264	void
585	evio_start (struct ev_io *w)	1265	ev_io_start (EV_P_ struct ev_io *w)
586	{	1266	{
		1267	int fd = w->fd;
		1268
587	if (ev_is_active (w))	1269	if (ev_is_active (w))
588	return;	1270	return;
589		1271
590	int fd = w->fd;	1272	assert (("ev_io_start called with negative fd", fd >= 0));
591		1273
592	ev_start ((W)w, 1);	1274	ev_start (EV_A_ (W)w, 1);
593	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1275	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
594	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1276	wlist_add ((WL *)&anfds[fd].head, (WL)w);
595		1277
596	++fdchangecnt;	1278	fd_change (EV_A_ fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = fd;
599	}	1279	}
600		1280
601	void	1281	void
602	evio_stop (struct ev_io *w)	1282	ev_io_stop (EV_P_ struct ev_io *w)
603	{	1283	{
		1284	ev_clear_pending (EV_A_ (W)w);
604	if (!ev_is_active (w))	1285	if (!ev_is_active (w))
605	return;	1286	return;
606		1287
607	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1288	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
608	ev_stop ((W)w);	1289	ev_stop (EV_A_ (W)w);
609		1290
610	++fdchangecnt;	1291	fd_change (EV_A_ w->fd);
611	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612	fdchanges [fdchangecnt - 1] = w->fd;
613	}	1292	}
614		1293
615	void	1294	void
616	evtimer_start (struct ev_timer *w)	1295	ev_timer_start (EV_P_ struct ev_timer *w)
617	{	1296	{
618	if (ev_is_active (w))	1297	if (ev_is_active (w))
619	return;	1298	return;
620		1299
621	if (w->is_abs)	1300	((WT)w)->at += mn_now;
		1301
		1302	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1303
		1304	ev_start (EV_A_ (W)w, ++timercnt);
		1305	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1306	timers [timercnt - 1] = w;
		1307	upheap ((WT *)timers, timercnt - 1);
		1308
		1309	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1310	}
		1311
		1312	void
		1313	ev_timer_stop (EV_P_ struct ev_timer *w)
		1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
		1316	if (!ev_is_active (w))
		1317	return;
		1318
		1319	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1320
		1321	if (((W)w)->active < timercnt--)
		1322	{
		1323	timers [((W)w)->active - 1] = timers [timercnt];
		1324	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
622	{	1325	}
623	/* this formula differs from the one in timer_reify becuse we do not round up */	1326
		1327	((WT)w)->at = w->repeat;
		1328
		1329	ev_stop (EV_A_ (W)w);
		1330	}
		1331
		1332	void
		1333	ev_timer_again (EV_P_ struct ev_timer *w)
		1334	{
		1335	if (ev_is_active (w))
		1336	{
624	if (w->repeat)	1337	if (w->repeat)
625	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1338	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
626
627	ev_start ((W)w, ++atimercnt);
628	array_needsize (atimers, atimermax, atimercnt, );
629	atimers [atimercnt - 1] = w;
630	upheap (atimers, atimercnt - 1);
631	}
632	else	1339	else
		1340	ev_timer_stop (EV_A_ w);
633	{	1341	}
634	w->at += now;	1342	else if (w->repeat)
		1343	ev_timer_start (EV_A_ w);
		1344	}
635		1345
636	ev_start ((W)w, ++rtimercnt);	1346	void
637	array_needsize (rtimers, rtimermax, rtimercnt, );	1347	ev_periodic_start (EV_P_ struct ev_periodic *w)
638	rtimers [rtimercnt - 1] = w;	1348	{
639	upheap (rtimers, rtimercnt - 1);	1349	if (ev_is_active (w))
		1350	return;
		1351
		1352	if (w->reschedule_cb)
		1353	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1354	else if (w->interval)
640	}	1355	{
		1356	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1357	/* this formula differs from the one in periodic_reify because we do not always round up */
		1358	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1359	}
641		1360
642	}	1361	ev_start (EV_A_ (W)w, ++periodiccnt);
		1362	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1363	periodics [periodiccnt - 1] = w;
		1364	upheap ((WT *)periodics, periodiccnt - 1);
643		1365
		1366	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1367	}
		1368
644	void	1369	void
645	evtimer_stop (struct ev_timer *w)	1370	ev_periodic_stop (EV_P_ struct ev_periodic *w)
646	{	1371	{
		1372	ev_clear_pending (EV_A_ (W)w);
647	if (!ev_is_active (w))	1373	if (!ev_is_active (w))
648	return;	1374	return;
649		1375
650	if (w->is_abs)	1376	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
651	{	1377
652	if (w->active < atimercnt--)	1378	if (((W)w)->active < periodiccnt--)
653	{
654	atimers [w->active - 1] = atimers [atimercnt];
655	downheap (atimers, atimercnt, w->active - 1);
656	}
657	}	1379	{
658	else	1380	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1381	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
659	{	1382	}
660	if (w->active < rtimercnt--)
661	{
662	rtimers [w->active - 1] = rtimers [rtimercnt];
663	downheap (rtimers, rtimercnt, w->active - 1);
664	}
665	}
666		1383
667	ev_stop ((W)w);	1384	ev_stop (EV_A_ (W)w);
668	}	1385	}
669		1386
670	void	1387	void
671	evsignal_start (struct ev_signal *w)	1388	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1389	{
		1390	/* TODO: use adjustheap and recalculation */
		1391	ev_periodic_stop (EV_A_ w);
		1392	ev_periodic_start (EV_A_ w);
		1393	}
		1394
		1395	void
		1396	ev_idle_start (EV_P_ struct ev_idle *w)
672	{	1397	{
673	if (ev_is_active (w))	1398	if (ev_is_active (w))
674	return;	1399	return;
675		1400
		1401	ev_start (EV_A_ (W)w, ++idlecnt);
		1402	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1403	idles [idlecnt - 1] = w;
		1404	}
		1405
		1406	void
		1407	ev_idle_stop (EV_P_ struct ev_idle *w)
		1408	{
		1409	ev_clear_pending (EV_A_ (W)w);
		1410	if (ev_is_active (w))
		1411	return;
		1412
		1413	idles [((W)w)->active - 1] = idles [--idlecnt];
		1414	ev_stop (EV_A_ (W)w);
		1415	}
		1416
		1417	void
		1418	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1419	{
		1420	if (ev_is_active (w))
		1421	return;
		1422
		1423	ev_start (EV_A_ (W)w, ++preparecnt);
		1424	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1425	prepares [preparecnt - 1] = w;
		1426	}
		1427
		1428	void
		1429	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1430	{
		1431	ev_clear_pending (EV_A_ (W)w);
		1432	if (ev_is_active (w))
		1433	return;
		1434
		1435	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1436	ev_stop (EV_A_ (W)w);
		1437	}
		1438
		1439	void
		1440	ev_check_start (EV_P_ struct ev_check *w)
		1441	{
		1442	if (ev_is_active (w))
		1443	return;
		1444
		1445	ev_start (EV_A_ (W)w, ++checkcnt);
		1446	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1447	checks [checkcnt - 1] = w;
		1448	}
		1449
		1450	void
		1451	ev_check_stop (EV_P_ struct ev_check *w)
		1452	{
		1453	ev_clear_pending (EV_A_ (W)w);
		1454	if (ev_is_active (w))
		1455	return;
		1456
		1457	checks [((W)w)->active - 1] = checks [--checkcnt];
		1458	ev_stop (EV_A_ (W)w);
		1459	}
		1460
		1461	#ifndef SA_RESTART
		1462	# define SA_RESTART 0
		1463	#endif
		1464
		1465	void
		1466	ev_signal_start (EV_P_ struct ev_signal *w)
		1467	{
		1468	#if EV_MULTIPLICITY
		1469	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1470	#endif
		1471	if (ev_is_active (w))
		1472	return;
		1473
		1474	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1475
676	ev_start ((W)w, 1);	1476	ev_start (EV_A_ (W)w, 1);
677	array_needsize (signals, signalmax, w->signum, signals_init);	1477	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
678	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1478	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679		1479
680	if (!w->next)	1480	if (!((WL)w)->next)
681	{	1481	{
		1482	#if WIN32
		1483	signal (w->signum, sighandler);
		1484	#else
682	struct sigaction sa;	1485	struct sigaction sa;
683	sa.sa_handler = sighandler;	1486	sa.sa_handler = sighandler;
684	sigfillset (&sa.sa_mask);	1487	sigfillset (&sa.sa_mask);
685	sa.sa_flags = 0;	1488	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
686	sigaction (w->signum, &sa, 0);	1489	sigaction (w->signum, &sa, 0);
		1490	#endif
687	}	1491	}
688	}	1492	}
689		1493
690	void	1494	void
691	evsignal_stop (struct ev_signal *w)	1495	ev_signal_stop (EV_P_ struct ev_signal *w)
692	{	1496	{
		1497	ev_clear_pending (EV_A_ (W)w);
693	if (!ev_is_active (w))	1498	if (!ev_is_active (w))
694	return;	1499	return;
695		1500
696	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1501	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697	ev_stop ((W)w);	1502	ev_stop (EV_A_ (W)w);
698		1503
699	if (!signals [w->signum - 1].head)	1504	if (!signals [w->signum - 1].head)
700	signal (w->signum, SIG_DFL);	1505	signal (w->signum, SIG_DFL);
701	}	1506	}
702		1507
703	void evidle_start (struct ev_idle *w)	1508	void
		1509	ev_child_start (EV_P_ struct ev_child *w)
704	{	1510	{
		1511	#if EV_MULTIPLICITY
		1512	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1513	#endif
705	if (ev_is_active (w))	1514	if (ev_is_active (w))
706	return;	1515	return;
707		1516
708	ev_start ((W)w, ++idlecnt);	1517	ev_start (EV_A_ (W)w, 1);
709	array_needsize (idles, idlemax, idlecnt, );	1518	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
710	idles [idlecnt - 1] = w;
711	}	1519	}
712		1520
713	void evidle_stop (struct ev_idle *w)	1521	void
		1522	ev_child_stop (EV_P_ struct ev_child *w)
714	{	1523	{
715	idles [w->active - 1] = idles [--idlecnt];	1524	ev_clear_pending (EV_A_ (W)w);
716	ev_stop ((W)w);
717	}
718
719	void evcheck_start (struct ev_check *w)
720	{
721	if (ev_is_active (w))	1525	if (ev_is_active (w))
722	return;	1526	return;
723		1527
724	ev_start ((W)w, ++checkcnt);	1528	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
725	array_needsize (checks, checkmax, checkcnt, );
726	checks [checkcnt - 1] = w;
727	}
728
729	void evcheck_stop (struct ev_check *w)
730	{
731	checks [w->active - 1] = checks [--checkcnt];
732	ev_stop ((W)w);	1529	ev_stop (EV_A_ (W)w);
733	}	1530	}
734		1531
735	/*****************************************************************************/	1532	/*****************************************************************************/
736		1533
737	#if 0	1534	struct ev_once
738
739	static void
740	sin_cb (struct ev_io *w, int revents)
741	{	1535	{
742	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
743	}
744
745	static void
746	ocb (struct ev_timer *w, int revents)
747	{
748	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
749	evtimer_stop (w);
750	evtimer_start (w);
751	}
752
753	static void
754	scb (struct ev_signal *w, int revents)
755	{
756	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
757	}
758
759	static void
760	gcb (struct ev_signal *w, int revents)
761	{
762	fprintf (stderr, "generic %x\n", revents);
763	}
764
765	int main (void)
766	{
767	struct ev_io sin;	1536	struct ev_io io;
768
769	ev_init (0);
770
771	evw_init (&sin, sin_cb, 55);
772	evio_set (&sin, 0, EV_READ);
773	evio_start (&sin);
774
775	struct ev_timer t[10000];
776
777	#if 0
778	int i;
779	for (i = 0; i < 10000; ++i)
780	{
781	struct ev_timer *w = t + i;
782	evw_init (w, ocb, i);
783	evtimer_set_abs (w, drand48 (), 0.99775533);
784	evtimer_start (w);
785	if (drand48 () < 0.5)
786	evtimer_stop (w);
787	}
788	#endif
789
790	struct ev_timer t1;	1537	struct ev_timer to;
791	evw_init (&t1, ocb, 0);	1538	void (cb)(int revents, void arg);
792	evtimer_set_abs (&t1, 5, 10);	1539	void *arg;
793	evtimer_start (&t1);	1540	};
794		1541
795	struct ev_signal sig;	1542	static void
796	evw_init (&sig, scb, 65535);	1543	once_cb (EV_P_ struct ev_once *once, int revents)
797	evsignal_set (&sig, SIGQUIT);	1544	{
798	evsignal_start (&sig);	1545	void (cb)(int revents, void arg) = once->cb;
		1546	void *arg = once->arg;
799		1547
800	struct ev_check cw;	1548	ev_io_stop (EV_A_ &once->io);
801	evw_init (&cw, gcb, 0);	1549	ev_timer_stop (EV_A_ &once->to);
802	evcheck_start (&cw);	1550	ev_free (once);
803		1551
804	struct ev_idle iw;	1552	cb (revents, arg);
805	evw_init (&iw, gcb, 0);
806	evidle_start (&iw);
807
808	ev_loop (0);
809
810	return 0;
811	}	1553	}
812		1554
813	#endif	1555	static void
		1556	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1557	{
		1558	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1559	}
814		1560
		1561	static void
		1562	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1563	{
		1564	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1565	}
815		1566
		1567	void
		1568	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1569	{
		1570	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
816		1571
		1572	if (!once)
		1573	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1574	else
		1575	{
		1576	once->cb = cb;
		1577	once->arg = arg;
817		1578
		1579	ev_init (&once->io, once_cb_io);
		1580	if (fd >= 0)
		1581	{
		1582	ev_io_set (&once->io, fd, events);
		1583	ev_io_start (EV_A_ &once->io);
		1584	}
		1585
		1586	ev_init (&once->to, once_cb_to);
		1587	if (timeout >= 0.)
		1588	{
		1589	ev_timer_set (&once->to, timeout, 0.);
		1590	ev_timer_start (EV_A_ &once->to);
		1591	}
		1592	}
		1593	}
		1594

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Comparing libev/ev.c (file contents): Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs. Revision 1.84 by root, Fri Nov 9 23:04:35 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.84 by root, Fri Nov 9 23:04:35 2007 UTC