[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 1.71 by root, Tue Nov 6 13:17:55 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	#ifndef PERL
		70	# include <signal.h>
		71	#endif
		72
		73	#ifndef WIN32
		74	# include <unistd.h>
		75	# include <sys/time.h>
		76	# include <sys/wait.h>
		77	#endif
		78	/**/
		79
14	#ifndef HAVE_MONOTONIC	80	#ifndef EV_USE_MONOTONIC
15	# ifdef CLOCK_MONOTONIC
16	# define HAVE_MONOTONIC 1	81	# define EV_USE_MONOTONIC 1
		82	#endif
		83
		84	#ifndef EV_USE_SELECT
		85	# define EV_USE_SELECT 1
		86	#endif
		87
		88	#ifndef EV_USE_POLL
		89	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		90	#endif
		91
		92	#ifndef EV_USE_EPOLL
		93	# define EV_USE_EPOLL 0
		94	#endif
		95
		96	#ifndef EV_USE_KQUEUE
		97	# define EV_USE_KQUEUE 0
		98	#endif
		99
		100	#ifndef EV_USE_WIN32
		101	# ifdef WIN32
		102	# define EV_USE_WIN32 0 /* it does not exist, use select */
		103	# undef EV_USE_SELECT
		104	# define EV_USE_SELECT 1
		105	# else
		106	# define EV_USE_WIN32 0
17	# endif	107	# endif
18	#endif	108	#endif
19		109
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	110	#ifndef EV_USE_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	111	# define EV_USE_REALTIME 1
30	#endif	112	#endif
		113
		114	/**/
		115
		116	#ifndef CLOCK_MONOTONIC
		117	# undef EV_USE_MONOTONIC
		118	# define EV_USE_MONOTONIC 0
		119	#endif
		120
		121	#ifndef CLOCK_REALTIME
		122	# undef EV_USE_REALTIME
		123	# define EV_USE_REALTIME 0
		124	#endif
		125
		126	/**/
31		127
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	128	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	129	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		130	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		131	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
34		132
35	#include "ev.h"	133	#include "ev.h"
36		134
37	struct ev_watcher {	135	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	136	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	137	# define inline inline
		138	#else
		139	# define expect(expr,value) (expr)
		140	# define inline static
		141	#endif
40		142
41	struct ev_watcher_list {	143	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	144	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	145
		146	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		147	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		148
45	typedef struct ev_watcher *W;	149	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	150	typedef struct ev_watcher_list *WL;
		151	typedef struct ev_watcher_time *WT;
47		152
48	static ev_tstamp now, diff; /* monotonic clock */	153	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
49	ev_tstamp ev_now;
50	int ev_method;
51		154
52	static int have_monotonic; /* runtime */	155	#if WIN32
53		156	/* note: the comment below could not be substantiated, but what would I care */
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	157	/* MSDN says this is required to handle SIGFPE */
55	static void (*method_modify)(int fd, int oev, int nev);	158	volatile double SIGFPE_REQ = 0.0f;
56	static void (*method_poll)(ev_tstamp timeout);	159	#endif
57		160
58	/*****************************************************************************/	161	/*****************************************************************************/
59		162
60	ev_tstamp	163	static void (syserr_cb)(const char msg);
		164
		165	void ev_set_syserr_cb (void (cb)(const char msg))
		166	{
		167	syserr_cb = cb;
		168	}
		169
		170	static void
		171	syserr (const char *msg)
		172	{
		173	if (!msg)
		174	msg = "(libev) system error";
		175
		176	if (syserr_cb)
		177	syserr_cb (msg);
		178	else
		179	{
		180	perror (msg);
		181	abort ();
		182	}
		183	}
		184
		185	static void (alloc)(void *ptr, long size);
		186
		187	void ev_set_allocator (void (cb)(void *ptr, long size))
		188	{
		189	alloc = cb;
		190	}
		191
		192	static void *
		193	ev_realloc (void *ptr, long size)
		194	{
		195	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		196
		197	if (!ptr && size)
		198	{
		199	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		200	abort ();
		201	}
		202
		203	return ptr;
		204	}
		205
		206	#define ev_malloc(size) ev_realloc (0, (size))
		207	#define ev_free(ptr) ev_realloc ((ptr), 0)
		208
		209	/*****************************************************************************/
		210
		211	typedef struct
		212	{
		213	WL head;
		214	unsigned char events;
		215	unsigned char reify;
		216	} ANFD;
		217
		218	typedef struct
		219	{
		220	W w;
		221	int events;
		222	} ANPENDING;
		223
		224	#if EV_MULTIPLICITY
		225
		226	struct ev_loop
		227	{
		228	# define VAR(name,decl) decl;
		229	# include "ev_vars.h"
		230	};
		231	# undef VAR
		232	# include "ev_wrap.h"
		233
		234	#else
		235
		236	# define VAR(name,decl) static decl;
		237	# include "ev_vars.h"
		238	# undef VAR
		239
		240	#endif
		241
		242	/*****************************************************************************/
		243
		244	inline ev_tstamp
61	ev_time (void)	245	ev_time (void)
62	{	246	{
63	#if HAVE_REALTIME	247	#if EV_USE_REALTIME
64	struct timespec ts;	248	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	249	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	250	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	251	#else
68	struct timeval tv;	252	struct timeval tv;
69	gettimeofday (&tv, 0);	253	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	254	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	255	#endif
72	}	256	}
73		257
74	static ev_tstamp	258	inline ev_tstamp
75	get_clock (void)	259	get_clock (void)
76	{	260	{
77	#if HAVE_MONOTONIC	261	#if EV_USE_MONOTONIC
78	if (have_monotonic)	262	if (expect_true (have_monotonic))
79	{	263	{
80	struct timespec ts;	264	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	265	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	266	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	267	}
84	#endif	268	#endif
85		269
86	return ev_time ();	270	return ev_time ();
87	}	271	}
88		272
		273	ev_tstamp
		274	ev_now (EV_P)
		275	{
		276	return rt_now;
		277	}
		278
		279	#define array_roundsize(base,n) ((n) \| 4 & ~3)
		280
89	#define array_needsize(base,cur,cnt,init) \	281	#define array_needsize(base,cur,cnt,init) \
90	if ((cnt) > cur) \	282	if (expect_false ((cnt) > cur)) \
91	{ \	283	{ \
92	int newcnt = cur ? cur << 1 : 16; \	284	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	285	do \
		286	{ \
		287	newcnt = array_roundsize (base, newcnt << 1); \
		288	} \
		289	while ((cnt) > newcnt); \
		290	\
94	base = realloc (base, sizeof (base) (newcnt)); \	291	base = ev_realloc (base, sizeof (base) (newcnt)); \
95	init (base + cur, newcnt - cur); \	292	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	293	cur = newcnt; \
97	}	294	}
		295
		296	#define array_slim(stem) \
		297	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		298	{ \
		299	stem ## max = array_roundsize (stem ## cnt >> 1); \
		300	base = ev_realloc (base, sizeof (base) (stem ## max)); \
		301	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		302	}
		303
		304	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		305	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		306	#define array_free_microshit(stem) \
		307	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		308
		309	#define array_free(stem, idx) \
		310	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		311
99	/*****************************************************************************/	312	/*****************************************************************************/
100		313
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	314	static void
114	anfds_init (ANFD *base, int count)	315	anfds_init (ANFD *base, int count)
115	{	316	{
116	while (count--)	317	while (count--)
117	{	318	{
118	base->head = 0;	319	base->head = 0;
119	base->wev = base->rev = EV_NONE;	320	base->events = EV_NONE;
		321	base->reify = 0;
		322
120	++base;	323	++base;
121	}	324	}
122	}	325	}
123		326
124	typedef struct
125	{
126	W w;
127	int events;
128	} ANPENDING;
129
130	static ANPENDING *pendings;
131	static int pendingmax, pendingcnt;
132
133	static void	327	static void
134	event (W w, int events)	328	event (EV_P_ W w, int events)
135	{	329	{
		330	if (w->pending)
		331	{
		332	pendings [ABSPRI (w)][w->pending - 1].events \|= events;
		333	return;
		334	}
		335
136	w->pending = ++pendingcnt;	336	w->pending = ++pendingcnt [ABSPRI (w)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	337	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
138	pendings [pendingcnt - 1].w = w;	338	pendings [ABSPRI (w)][w->pending - 1].w = w;
139	pendings [pendingcnt - 1].events = events;	339	pendings [ABSPRI (w)][w->pending - 1].events = events;
140	}	340	}
141		341
142	static void	342	static void
		343	queue_events (EV_P_ W *events, int eventcnt, int type)
		344	{
		345	int i;
		346
		347	for (i = 0; i < eventcnt; ++i)
		348	event (EV_A_ events [i], type);
		349	}
		350
		351	static void
143	fd_event (int fd, int events)	352	fd_event (EV_P_ int fd, int events)
144	{	353	{
145	ANFD *anfd = anfds + fd;	354	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	355	struct ev_io *w;
147		356
148	for (w = anfd->head; w; w = w->next)	357	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
149	{	358	{
150	int ev = w->events & events;	359	int ev = w->events & events;
151		360
152	if (ev)	361	if (ev)
153	event ((W)w, ev);	362	event (EV_A_ (W)w, ev);
154	}	363	}
155	}	364	}
156		365
		366	/*****************************************************************************/
		367
157	static void	368	static void
158	queue_events (W *events, int eventcnt, int type)	369	fd_reify (EV_P)
159	{	370	{
160	int i;	371	int i;
161		372
162	for (i = 0; i < eventcnt; ++i)	373	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	374	{
		375	int fd = fdchanges [i];
		376	ANFD *anfd = anfds + fd;
		377	struct ev_io *w;
		378
		379	int events = 0;
		380
		381	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		382	events \|= w->events;
		383
		384	anfd->reify = 0;
		385
		386	method_modify (EV_A_ fd, anfd->events, events);
		387	anfd->events = events;
		388	}
		389
		390	fdchangecnt = 0;
		391	}
		392
		393	static void
		394	fd_change (EV_P_ int fd)
		395	{
		396	if (anfds [fd].reify)
		397	return;
		398
		399	anfds [fd].reify = 1;
		400
		401	++fdchangecnt;
		402	array_needsize (fdchanges, fdchangemax, fdchangecnt, (void));
		403	fdchanges [fdchangecnt - 1] = fd;
		404	}
		405
		406	static void
		407	fd_kill (EV_P_ int fd)
		408	{
		409	struct ev_io *w;
		410
		411	while ((w = (struct ev_io *)anfds [fd].head))
		412	{
		413	ev_io_stop (EV_A_ w);
		414	event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		415	}
		416	}
		417
		418	static int
		419	fd_valid (int fd)
		420	{
		421	#ifdef WIN32
		422	return !!win32_get_osfhandle (fd);
		423	#else
		424	return fcntl (fd, F_GETFD) != -1;
		425	#endif
		426	}
		427
		428	/* called on EBADF to verify fds */
		429	static void
		430	fd_ebadf (EV_P)
		431	{
		432	int fd;
		433
		434	for (fd = 0; fd < anfdmax; ++fd)
		435	if (anfds [fd].events)
		436	if (!fd_valid (fd) == -1 && errno == EBADF)
		437	fd_kill (EV_A_ fd);
		438	}
		439
		440	/* called on ENOMEM in select/poll to kill some fds and retry */
		441	static void
		442	fd_enomem (EV_P)
		443	{
		444	int fd;
		445
		446	for (fd = anfdmax; fd--; )
		447	if (anfds [fd].events)
		448	{
		449	fd_kill (EV_A_ fd);
		450	return;
		451	}
		452	}
		453
		454	/* usually called after fork if method needs to re-arm all fds from scratch */
		455	static void
		456	fd_rearm_all (EV_P)
		457	{
		458	int fd;
		459
		460	/* this should be highly optimised to not do anything but set a flag */
		461	for (fd = 0; fd < anfdmax; ++fd)
		462	if (anfds [fd].events)
		463	{
		464	anfds [fd].events = 0;
		465	fd_change (EV_A_ fd);
		466	}
164	}	467	}
165		468
166	/*****************************************************************************/	469	/*****************************************************************************/
167		470
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	471	static void
175	upheap (struct ev_timer **timers, int k)	472	upheap (WT *heap, int k)
176	{	473	{
177	struct ev_timer *w = timers [k];	474	WT w = heap [k];
178		475
179	while (k && timers [k >> 1]->at > w->at)	476	while (k && heap [k >> 1]->at > w->at)
180	{	477	{
181	timers [k] = timers [k >> 1];	478	heap [k] = heap [k >> 1];
182	timers [k]->active = k + 1;	479	((W)heap [k])->active = k + 1;
183	k >>= 1;	480	k >>= 1;
184	}	481	}
185		482
186	timers [k] = w;	483	heap [k] = w;
187	timers [k]->active = k + 1;	484	((W)heap [k])->active = k + 1;
188		485
189	}	486	}
190		487
191	static void	488	static void
192	downheap (struct ev_timer **timers, int N, int k)	489	downheap (WT *heap, int N, int k)
193	{	490	{
194	struct ev_timer *w = timers [k];	491	WT w = heap [k];
195		492
196	while (k < (N >> 1))	493	while (k < (N >> 1))
197	{	494	{
198	int j = k << 1;	495	int j = k << 1;
199		496
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	497	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
201	++j;	498	++j;
202		499
203	if (w->at <= timers [j]->at)	500	if (w->at <= heap [j]->at)
204	break;	501	break;
205		502
206	timers [k] = timers [j];	503	heap [k] = heap [j];
207	timers [k]->active = k + 1;	504	((W)heap [k])->active = k + 1;
208	k = j;	505	k = j;
209	}	506	}
210		507
211	timers [k] = w;	508	heap [k] = w;
212	timers [k]->active = k + 1;	509	((W)heap [k])->active = k + 1;
213	}	510	}
214		511
215	/*****************************************************************************/	512	/*****************************************************************************/
216		513
217	typedef struct	514	typedef struct
218	{	515	{
219	struct ev_signal *head;	516	WL head;
220	sig_atomic_t gotsig;	517	sig_atomic_t volatile gotsig;
221	} ANSIG;	518	} ANSIG;
222		519
223	static ANSIG *signals;	520	static ANSIG *signals;
224	static int signalmax;	521	static int signalmax;
225		522
226	static int sigpipe [2];	523	static int sigpipe [2];
227	static sig_atomic_t gotsig;	524	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	525	static struct ev_io sigev;
229		526
230	static void	527	static void
231	signals_init (ANSIG *base, int count)	528	signals_init (ANSIG *base, int count)
232	{	529	{
233	while (count--)	530	while (count--)
234	{	531	{
235	base->head = 0;	532	base->head = 0;
236	base->gotsig = 0;	533	base->gotsig = 0;
		534
237	++base;	535	++base;
238	}	536	}
239	}	537	}
240		538
241	static void	539	static void
242	sighandler (int signum)	540	sighandler (int signum)
243	{	541	{
		542	#if WIN32
		543	signal (signum, sighandler);
		544	#endif
		545
244	signals [signum - 1].gotsig = 1;	546	signals [signum - 1].gotsig = 1;
245		547
246	if (!gotsig)	548	if (!gotsig)
247	{	549	{
		550	int old_errno = errno;
248	gotsig = 1;	551	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);	552	write (sigpipe [1], &signum, 1);
		553	errno = old_errno;
250	}	554	}
251	}	555	}
252		556
253	static void	557	static void
254	sigcb (struct ev_io *iow, int revents)	558	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	559	{
256	struct ev_signal *w;	560	WL w;
257	int sig;	561	int signum;
258		562
		563	read (sigpipe [0], &revents, 1);
259	gotsig = 0;	564	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		565
262	for (sig = signalmax; sig--; )	566	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	567	if (signals [signum].gotsig)
264	{	568	{
265	signals [sig].gotsig = 0;	569	signals [signum].gotsig = 0;
266		570
267	for (w = signals [sig].head; w; w = w->next)	571	for (w = signals [signum].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);	572	event (EV_A_ (W)w, EV_SIGNAL);
269	}	573	}
270	}	574	}
271		575
272	static void	576	static void
273	siginit (void)	577	siginit (EV_P)
274	{	578	{
		579	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	580	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	581	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		582
278	/* rather than sort out wether we really need nb, set it */	583	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	584	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	585	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		586	#endif
281		587
282	evio_set (&sigev, sigpipe [0], EV_READ);	588	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	589	ev_io_start (EV_A_ &sigev);
		590	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	591	}
285		592
286	/*****************************************************************************/	593	/*****************************************************************************/
287		594
288	static struct ev_idle **idles;	595	static struct ev_child *childs [PID_HASHSIZE];
289	static int idlemax, idlecnt;
290		596
291	static struct ev_check **checks;	597	#ifndef WIN32
292	static int checkmax, checkcnt;	598
		599	static struct ev_signal childev;
		600
		601	#ifndef WCONTINUED
		602	# define WCONTINUED 0
		603	#endif
		604
		605	static void
		606	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		607	{
		608	struct ev_child *w;
		609
		610	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		611	if (w->pid == pid \|\| !w->pid)
		612	{
		613	ev_priority (w) = ev_priority (sw); /* need to do it now */
		614	w->rpid = pid;
		615	w->rstatus = status;
		616	event (EV_A_ (W)w, EV_CHILD);
		617	}
		618	}
		619
		620	static void
		621	childcb (EV_P_ struct ev_signal *sw, int revents)
		622	{
		623	int pid, status;
		624
		625	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		626	{
		627	/* make sure we are called again until all childs have been reaped */
		628	event (EV_A_ (W)sw, EV_SIGNAL);
		629
		630	child_reap (EV_A_ sw, pid, pid, status);
		631	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		632	}
		633	}
		634
		635	#endif
293		636
294	/*****************************************************************************/	637	/*****************************************************************************/
295		638
		639	#if EV_USE_KQUEUE
		640	# include "ev_kqueue.c"
		641	#endif
296	#if HAVE_EPOLL	642	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	643	# include "ev_epoll.c"
298	#endif	644	#endif
		645	#if EV_USE_POLL
		646	# include "ev_poll.c"
		647	#endif
299	#if HAVE_SELECT	648	#if EV_USE_SELECT
300	# include "ev_select.c"	649	# include "ev_select.c"
301	#endif	650	#endif
302		651
303	int ev_init (int flags)	652	int
		653	ev_version_major (void)
304	{	654	{
		655	return EV_VERSION_MAJOR;
		656	}
		657
		658	int
		659	ev_version_minor (void)
		660	{
		661	return EV_VERSION_MINOR;
		662	}
		663
		664	/* return true if we are running with elevated privileges and should ignore env variables */
		665	static int
		666	enable_secure (void)
		667	{
		668	#ifdef WIN32
		669	return 0;
		670	#else
		671	return getuid () != geteuid ()
		672	\|\| getgid () != getegid ();
		673	#endif
		674	}
		675
		676	int
		677	ev_method (EV_P)
		678	{
		679	return method;
		680	}
		681
		682	static void
		683	loop_init (EV_P_ int methods)
		684	{
		685	if (!method)
		686	{
305	#if HAVE_MONOTONIC	687	#if EV_USE_MONOTONIC
306	{	688	{
307	struct timespec ts;	689	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	690	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	691	have_monotonic = 1;
310	}	692	}
311	#endif	693	#endif
312		694
313	ev_now = ev_time ();	695	rt_now = ev_time ();
314	now = get_clock ();	696	mn_now = get_clock ();
315	diff = ev_now - now;	697	now_floor = mn_now;
		698	rtmn_diff = rt_now - mn_now;
316		699
		700	if (methods == EVMETHOD_AUTO)
		701	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		702	methods = atoi (getenv ("LIBEV_METHODS"));
		703	else
		704	methods = EVMETHOD_ANY;
		705
		706	method = 0;
		707	#if EV_USE_WIN32
		708	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		709	#endif
		710	#if EV_USE_KQUEUE
		711	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		712	#endif
		713	#if EV_USE_EPOLL
		714	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		715	#endif
		716	#if EV_USE_POLL
		717	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		718	#endif
		719	#if EV_USE_SELECT
		720	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		721	#endif
		722
		723	ev_watcher_init (&sigev, sigcb);
		724	ev_set_priority (&sigev, EV_MAXPRI);
		725	}
		726	}
		727
		728	void
		729	loop_destroy (EV_P)
		730	{
		731	int i;
		732
		733	#if EV_USE_WIN32
		734	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		735	#endif
		736	#if EV_USE_KQUEUE
		737	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		738	#endif
		739	#if EV_USE_EPOLL
		740	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		741	#endif
		742	#if EV_USE_POLL
		743	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		744	#endif
		745	#if EV_USE_SELECT
		746	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		747	#endif
		748
		749	for (i = NUMPRI; i--; )
		750	array_free (pending, [i]);
		751
		752	/* have to use the microsoft-never-gets-it-right macro */
		753	array_free_microshit (fdchange);
		754	array_free_microshit (timer);
		755	array_free_microshit (periodic);
		756	array_free_microshit (idle);
		757	array_free_microshit (prepare);
		758	array_free_microshit (check);
		759
		760	method = 0;
		761	}
		762
		763	static void
		764	loop_fork (EV_P)
		765	{
		766	#if EV_USE_EPOLL
		767	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		768	#endif
		769	#if EV_USE_KQUEUE
		770	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		771	#endif
		772
		773	if (ev_is_active (&sigev))
		774	{
		775	/* default loop */
		776
		777	ev_ref (EV_A);
		778	ev_io_stop (EV_A_ &sigev);
		779	close (sigpipe [0]);
		780	close (sigpipe [1]);
		781
		782	while (pipe (sigpipe))
		783	syserr ("(libev) error creating pipe");
		784
		785	siginit (EV_A);
		786	}
		787
		788	postfork = 0;
		789	}
		790
		791	#if EV_MULTIPLICITY
		792	struct ev_loop *
		793	ev_loop_new (int methods)
		794	{
		795	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		796
		797	memset (loop, 0, sizeof (struct ev_loop));
		798
		799	loop_init (EV_A_ methods);
		800
		801	if (ev_method (EV_A))
		802	return loop;
		803
		804	return 0;
		805	}
		806
		807	void
		808	ev_loop_destroy (EV_P)
		809	{
		810	loop_destroy (EV_A);
		811	ev_free (loop);
		812	}
		813
		814	void
		815	ev_loop_fork (EV_P)
		816	{
		817	postfork = 1;
		818	}
		819
		820	#endif
		821
		822	#if EV_MULTIPLICITY
		823	struct ev_loop default_loop_struct;
		824	static struct ev_loop *default_loop;
		825
		826	struct ev_loop *
		827	#else
		828	static int default_loop;
		829
		830	int
		831	#endif
		832	ev_default_loop (int methods)
		833	{
		834	if (sigpipe [0] == sigpipe [1])
317	if (pipe (sigpipe))	835	if (pipe (sigpipe))
318	return 0;	836	return 0;
319		837
320	ev_method = EVMETHOD_NONE;	838	if (!default_loop)
321	#if HAVE_EPOLL	839	{
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	840	#if EV_MULTIPLICITY
		841	struct ev_loop *loop = default_loop = &default_loop_struct;
		842	#else
		843	default_loop = 1;
323	#endif	844	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327		845
		846	loop_init (EV_A_ methods);
		847
		848	if (ev_method (EV_A))
		849	{
		850	siginit (EV_A);
		851
		852	#ifndef WIN32
		853	ev_signal_init (&childev, childcb, SIGCHLD);
		854	ev_set_priority (&childev, EV_MAXPRI);
		855	ev_signal_start (EV_A_ &childev);
		856	ev_unref (EV_A); /* child watcher should not keep loop alive */
		857	#endif
		858	}
		859	else
		860	default_loop = 0;
		861	}
		862
		863	return default_loop;
		864	}
		865
		866	void
		867	ev_default_destroy (void)
		868	{
		869	#if EV_MULTIPLICITY
		870	struct ev_loop *loop = default_loop;
		871	#endif
		872
		873	#ifndef WIN32
		874	ev_ref (EV_A); /* child watcher */
		875	ev_signal_stop (EV_A_ &childev);
		876	#endif
		877
		878	ev_ref (EV_A); /* signal watcher */
		879	ev_io_stop (EV_A_ &sigev);
		880
		881	close (sigpipe [0]); sigpipe [0] = 0;
		882	close (sigpipe [1]); sigpipe [1] = 0;
		883
		884	loop_destroy (EV_A);
		885	}
		886
		887	void
		888	ev_default_fork (void)
		889	{
		890	#if EV_MULTIPLICITY
		891	struct ev_loop *loop = default_loop;
		892	#endif
		893
328	if (ev_method)	894	if (method)
329	{	895	postfork = 1;
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}	896	}
336		897
337	/*****************************************************************************/	898	/*****************************************************************************/
338		899
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	900	static void
366	fd_reify (void)	901	call_pending (EV_P)
367	{	902	{
368	int i;	903	int pri;
369		904
370	for (i = 0; i < fdchangecnt; ++i)	905	for (pri = NUMPRI; pri--; )
371	{	906	while (pendingcnt [pri])
372	int fd = fdchanges [i];
373	ANFD *anfd = anfds + fd;
374	struct ev_io *w;
375
376	int wev = 0;
377
378	for (w = anfd->head; w; w = w->next)
379	wev \|= w->events;
380
381	if (anfd->wev != wev)
382	{	907	{
383	method_modify (fd, anfd->wev, wev);	908	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
384	anfd->wev = wev;
385	}
386	}
387		909
388	fdchangecnt = 0;
389	}
390
391	static void
392	call_pending ()
393	{
394	int i;
395
396	for (i = 0; i < pendingcnt; ++i)
397	{
398	ANPENDING *p = pendings + i;
399
400	if (p->w)	910	if (p->w)
401	{	911	{
402	p->w->pending = 0;	912	p->w->pending = 0;
403	p->w->cb (p->w, p->events);	913	p->w->cb (EV_A_ p->w, p->events);
404	}	914	}
405	}	915	}
406
407	pendingcnt = 0;
408	}	916	}
409		917
410	static void	918	static void
411	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	919	timers_reify (EV_P)
412	{	920	{
413	while (timercnt && timers [0]->at <= now)	921	while (timercnt && ((WT)timers [0])->at <= mn_now)
414	{	922	{
415	struct ev_timer *w = timers [0];	923	struct ev_timer *w = timers [0];
		924
		925	assert (("inactive timer on timer heap detected", ev_is_active (w)));
416		926
417	/* first reschedule or stop timer */	927	/* first reschedule or stop timer */
418	if (w->repeat)	928	if (w->repeat)
419	{	929	{
420	if (w->is_abs)	930	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;	931	((WT)w)->at = mn_now + w->repeat;
424
425	assert (w->at > now);
426
427	downheap (timers, timercnt, 0);	932	downheap ((WT *)timers, timercnt, 0);
428	}	933	}
429	else	934	else
		935	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		936
		937	event (EV_A_ (W)w, EV_TIMEOUT);
		938	}
		939	}
		940
		941	static void
		942	periodics_reify (EV_P)
		943	{
		944	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		945	{
		946	struct ev_periodic *w = periodics [0];
		947
		948	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		949
		950	/* first reschedule or stop timer */
		951	if (w->interval)
430	{	952	{
431	evtimer_stop (w); /* nonrepeating: stop timer */	953	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
432	--timercnt; /* maybe pass by reference instead? */	954	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		955	downheap ((WT *)periodics, periodiccnt, 0);
433	}	956	}
		957	else
		958	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
434		959
435	event ((W)w, EV_TIMEOUT);	960	event (EV_A_ (W)w, EV_PERIODIC);
436	}	961	}
437	}	962	}
438		963
439	static void	964	static void
440	time_update ()	965	periodics_reschedule (EV_P)
441	{	966	{
442	int i;	967	int i;
443	ev_now = ev_time ();
444		968
445	if (have_monotonic)	969	/* adjust periodics after time jump */
		970	for (i = 0; i < periodiccnt; ++i)
446	{	971	{
447	ev_tstamp odiff = diff;	972	struct ev_periodic *w = periodics [i];
448		973
449	/* detecting time jumps is much more difficult */	974	if (w->interval)
450	for (i = 2; --i; ) /* loop a few times, before making important decisions */
451	{	975	{
452	now = get_clock ();	976	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
453	diff = ev_now - now;
454		977
455	if (fabs (odiff - diff) < MIN_TIMEJUMP)	978	if (fabs (diff) >= 1e-4)
456	return; /* all is well */	979	{
		980	ev_periodic_stop (EV_A_ w);
		981	ev_periodic_start (EV_A_ w);
457		982
458	ev_now = ev_time ();	983	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		984	}
459	}	985	}
		986	}
		987	}
460		988
461	/* time jump detected, reschedule atimers */	989	inline int
462	for (i = 0; i < atimercnt; ++i)	990	time_update_monotonic (EV_P)
		991	{
		992	mn_now = get_clock ();
		993
		994	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		995	{
		996	rt_now = rtmn_diff + mn_now;
		997	return 0;
		998	}
		999	else
		1000	{
		1001	now_floor = mn_now;
		1002	rt_now = ev_time ();
		1003	return 1;
		1004	}
		1005	}
		1006
		1007	static void
		1008	time_update (EV_P)
		1009	{
		1010	int i;
		1011
		1012	#if EV_USE_MONOTONIC
		1013	if (expect_true (have_monotonic))
		1014	{
		1015	if (time_update_monotonic (EV_A))
463	{	1016	{
464	struct ev_timer *w = atimers [i];	1017	ev_tstamp odiff = rtmn_diff;
465	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1018
		1019	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1020	{
		1021	rtmn_diff = rt_now - mn_now;
		1022
		1023	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1024	return; /* all is well */
		1025
		1026	rt_now = ev_time ();
		1027	mn_now = get_clock ();
		1028	now_floor = mn_now;
		1029	}
		1030
		1031	periodics_reschedule (EV_A);
		1032	/* no timer adjustment, as the monotonic clock doesn't jump */
		1033	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
466	}	1034	}
467	}	1035	}
468	else	1036	else
		1037	#endif
469	{	1038	{
470	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1039	rt_now = ev_time ();
471	/* time jump detected, adjust rtimers */	1040
		1041	if (expect_false (mn_now > rt_now \|\| mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1042	{
		1043	periodics_reschedule (EV_A);
		1044
		1045	/* adjust timers. this is easy, as the offset is the same for all */
472	for (i = 0; i < rtimercnt; ++i)	1046	for (i = 0; i < timercnt; ++i)
473	rtimers [i]->at += ev_now - now;	1047	((WT)timers [i])->at += rt_now - mn_now;
		1048	}
474		1049
475	now = ev_now;	1050	mn_now = rt_now;
476	}	1051	}
477	}	1052	}
478		1053
479	int ev_loop_done;	1054	void
		1055	ev_ref (EV_P)
		1056	{
		1057	++activecnt;
		1058	}
480		1059
		1060	void
		1061	ev_unref (EV_P)
		1062	{
		1063	--activecnt;
		1064	}
		1065
		1066	static int loop_done;
		1067
		1068	void
481	void ev_loop (int flags)	1069	ev_loop (EV_P_ int flags)
482	{	1070	{
483	double block;	1071	double block;
484	ev_loop_done = flags & EVLOOP_ONESHOT;	1072	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		1073
492	do	1074	do
493	{	1075	{
		1076	/* queue check watchers (and execute them) */
		1077	if (expect_false (preparecnt))
		1078	{
		1079	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1080	call_pending (EV_A);
		1081	}
		1082
		1083	/* we might have forked, so reify kernel state if necessary */
		1084	if (expect_false (postfork))
		1085	loop_fork (EV_A);
		1086
494	/* update fd-related kernel structures */	1087	/* update fd-related kernel structures */
495	fd_reify ();	1088	fd_reify (EV_A);
496		1089
497	/* calculate blocking time */	1090	/* calculate blocking time */
		1091
		1092	/* we only need this for !monotonic clockor timers, but as we basically
		1093	always have timers, we just calculate it always */
		1094	#if EV_USE_MONOTONIC
		1095	if (expect_true (have_monotonic))
		1096	time_update_monotonic (EV_A);
		1097	else
		1098	#endif
		1099	{
		1100	rt_now = ev_time ();
		1101	mn_now = rt_now;
		1102	}
		1103
498	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1104	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
499	block = 0.;	1105	block = 0.;
500	else	1106	else
501	{	1107	{
502	block = MAX_BLOCKTIME;	1108	block = MAX_BLOCKTIME;
503		1109
504	if (rtimercnt)	1110	if (timercnt)
505	{	1111	{
506	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1112	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
507	if (block > to) block = to;	1113	if (block > to) block = to;
508	}	1114	}
509		1115
510	if (atimercnt)	1116	if (periodiccnt)
511	{	1117	{
512	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1118	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
513	if (block > to) block = to;	1119	if (block > to) block = to;
514	}	1120	}
515		1121
516	if (block < 0.) block = 0.;	1122	if (block < 0.) block = 0.;
517	}	1123	}
518		1124
519	method_poll (block);	1125	method_poll (EV_A_ block);
520		1126
521	/* update ev_now, do magic */	1127	/* update rt_now, do magic */
522	time_update ();	1128	time_update (EV_A);
523		1129
524	/* queue pending timers and reschedule them */	1130	/* queue pending timers and reschedule them */
525	/* absolute timers first */	1131	timers_reify (EV_A); /* relative timers called last */
526	timers_reify (atimers, atimercnt, ev_now);	1132	periodics_reify (EV_A); /* absolute timers called first */
527	/* relative timers second */
528	timers_reify (rtimers, rtimercnt, now);
529		1133
530	/* queue idle watchers unless io or timers are pending */	1134	/* queue idle watchers unless io or timers are pending */
531	if (!pendingcnt)	1135	if (!pendingcnt)
532	queue_events ((W *)idles, idlecnt, EV_IDLE);	1136	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
533		1137
534	/* queue check and possibly idle watchers */	1138	/* queue check watchers, to be executed first */
		1139	if (checkcnt)
535	queue_events ((W *)checks, checkcnt, EV_CHECK);	1140	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
536		1141
537	call_pending ();	1142	call_pending (EV_A);
538	}	1143	}
539	while (!ev_loop_done);	1144	while (activecnt && !loop_done);
		1145
		1146	if (loop_done != 2)
		1147	loop_done = 0;
		1148	}
		1149
		1150	void
		1151	ev_unloop (EV_P_ int how)
		1152	{
		1153	loop_done = how;
540	}	1154	}
541		1155
542	/*****************************************************************************/	1156	/*****************************************************************************/
543		1157
544	static void	1158	inline void
545	wlist_add (WL *head, WL elem)	1159	wlist_add (WL *head, WL elem)
546	{	1160	{
547	elem->next = *head;	1161	elem->next = *head;
548	*head = elem;	1162	*head = elem;
549	}	1163	}
550		1164
551	static void	1165	inline void
552	wlist_del (WL *head, WL elem)	1166	wlist_del (WL *head, WL elem)
553	{	1167	{
554	while (*head)	1168	while (*head)
555	{	1169	{
556	if (*head == elem)	1170	if (*head == elem)
561		1175
562	head = &(*head)->next;	1176	head = &(*head)->next;
563	}	1177	}
564	}	1178	}
565		1179
566	static void	1180	inline void
		1181	ev_clear_pending (EV_P_ W w)
		1182	{
		1183	if (w->pending)
		1184	{
		1185	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1186	w->pending = 0;
		1187	}
		1188	}
		1189
		1190	inline void
567	ev_start (W w, int active)	1191	ev_start (EV_P_ W w, int active)
568	{	1192	{
569	w->pending = 0;	1193	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1194	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1195
570	w->active = active;	1196	w->active = active;
		1197	ev_ref (EV_A);
571	}	1198	}
572		1199
573	static void	1200	inline void
574	ev_stop (W w)	1201	ev_stop (EV_P_ W w)
575	{	1202	{
576	if (w->pending)	1203	ev_unref (EV_A);
577	pendings [w->pending - 1].w = 0;
578
579	w->active = 0;	1204	w->active = 0;
580	}	1205	}
581		1206
582	/*****************************************************************************/	1207	/*****************************************************************************/
583		1208
584	void	1209	void
585	evio_start (struct ev_io *w)	1210	ev_io_start (EV_P_ struct ev_io *w)
586	{	1211	{
		1212	int fd = w->fd;
		1213
587	if (ev_is_active (w))	1214	if (ev_is_active (w))
588	return;	1215	return;
589		1216
590	int fd = w->fd;	1217	assert (("ev_io_start called with negative fd", fd >= 0));
591		1218
592	ev_start ((W)w, 1);	1219	ev_start (EV_A_ (W)w, 1);
593	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1220	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
594	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1221	wlist_add ((WL *)&anfds[fd].head, (WL)w);
595		1222
596	++fdchangecnt;	1223	fd_change (EV_A_ fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = fd;
599	}	1224	}
600		1225
601	void	1226	void
602	evio_stop (struct ev_io *w)	1227	ev_io_stop (EV_P_ struct ev_io *w)
603	{	1228	{
		1229	ev_clear_pending (EV_A_ (W)w);
604	if (!ev_is_active (w))	1230	if (!ev_is_active (w))
605	return;	1231	return;
606		1232
607	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1233	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
608	ev_stop ((W)w);	1234	ev_stop (EV_A_ (W)w);
609		1235
610	++fdchangecnt;	1236	fd_change (EV_A_ w->fd);
611	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
612	fdchanges [fdchangecnt - 1] = w->fd;
613	}	1237	}
614		1238
615	void	1239	void
616	evtimer_start (struct ev_timer *w)	1240	ev_timer_start (EV_P_ struct ev_timer *w)
617	{	1241	{
618	if (ev_is_active (w))	1242	if (ev_is_active (w))
619	return;	1243	return;
620		1244
621	if (w->is_abs)	1245	((WT)w)->at += mn_now;
		1246
		1247	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1248
		1249	ev_start (EV_A_ (W)w, ++timercnt);
		1250	array_needsize (timers, timermax, timercnt, (void));
		1251	timers [timercnt - 1] = w;
		1252	upheap ((WT *)timers, timercnt - 1);
		1253
		1254	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1255	}
		1256
		1257	void
		1258	ev_timer_stop (EV_P_ struct ev_timer *w)
		1259	{
		1260	ev_clear_pending (EV_A_ (W)w);
		1261	if (!ev_is_active (w))
		1262	return;
		1263
		1264	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1265
		1266	if (((W)w)->active < timercnt--)
		1267	{
		1268	timers [((W)w)->active - 1] = timers [timercnt];
		1269	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
622	{	1270	}
623	/* this formula differs from the one in timer_reify becuse we do not round up */	1271
		1272	((WT)w)->at = w->repeat;
		1273
		1274	ev_stop (EV_A_ (W)w);
		1275	}
		1276
		1277	void
		1278	ev_timer_again (EV_P_ struct ev_timer *w)
		1279	{
		1280	if (ev_is_active (w))
		1281	{
624	if (w->repeat)	1282	if (w->repeat)
625	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1283	{
626		1284	((WT)w)->at = mn_now + w->repeat;
627	ev_start ((W)w, ++atimercnt);	1285	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
628	array_needsize (atimers, atimermax, atimercnt, );	1286	}
629	atimers [atimercnt - 1] = w;
630	upheap (atimers, atimercnt - 1);
631	}
632	else	1287	else
		1288	ev_timer_stop (EV_A_ w);
633	{	1289	}
634	w->at += now;	1290	else if (w->repeat)
635		1291	ev_timer_start (EV_A_ w);
636	ev_start ((W)w, ++rtimercnt);
637	array_needsize (rtimers, rtimermax, rtimercnt, );
638	rtimers [rtimercnt - 1] = w;
639	upheap (rtimers, rtimercnt - 1);
640	}
641
642	}	1292	}
643		1293
644	void	1294	void
645	evtimer_stop (struct ev_timer *w)	1295	ev_periodic_start (EV_P_ struct ev_periodic *w)
646	{	1296	{
		1297	if (ev_is_active (w))
		1298	return;
		1299
		1300	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1301
		1302	/* this formula differs from the one in periodic_reify because we do not always round up */
		1303	if (w->interval)
		1304	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1305
		1306	ev_start (EV_A_ (W)w, ++periodiccnt);
		1307	array_needsize (periodics, periodicmax, periodiccnt, (void));
		1308	periodics [periodiccnt - 1] = w;
		1309	upheap ((WT *)periodics, periodiccnt - 1);
		1310
		1311	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1312	}
		1313
		1314	void
		1315	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1316	{
		1317	ev_clear_pending (EV_A_ (W)w);
647	if (!ev_is_active (w))	1318	if (!ev_is_active (w))
648	return;	1319	return;
649		1320
650	if (w->is_abs)	1321	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
651	{	1322
652	if (w->active < atimercnt--)	1323	if (((W)w)->active < periodiccnt--)
653	{
654	atimers [w->active - 1] = atimers [atimercnt];
655	downheap (atimers, atimercnt, w->active - 1);
656	}
657	}	1324	{
658	else	1325	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1326	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
659	{	1327	}
660	if (w->active < rtimercnt--)
661	{
662	rtimers [w->active - 1] = rtimers [rtimercnt];
663	downheap (rtimers, rtimercnt, w->active - 1);
664	}
665	}
666		1328
667	ev_stop ((W)w);	1329	ev_stop (EV_A_ (W)w);
668	}	1330	}
669		1331
670	void	1332	void
671	evsignal_start (struct ev_signal *w)	1333	ev_idle_start (EV_P_ struct ev_idle *w)
672	{	1334	{
673	if (ev_is_active (w))	1335	if (ev_is_active (w))
674	return;	1336	return;
675		1337
		1338	ev_start (EV_A_ (W)w, ++idlecnt);
		1339	array_needsize (idles, idlemax, idlecnt, (void));
		1340	idles [idlecnt - 1] = w;
		1341	}
		1342
		1343	void
		1344	ev_idle_stop (EV_P_ struct ev_idle *w)
		1345	{
		1346	ev_clear_pending (EV_A_ (W)w);
		1347	if (ev_is_active (w))
		1348	return;
		1349
		1350	idles [((W)w)->active - 1] = idles [--idlecnt];
		1351	ev_stop (EV_A_ (W)w);
		1352	}
		1353
		1354	void
		1355	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1356	{
		1357	if (ev_is_active (w))
		1358	return;
		1359
		1360	ev_start (EV_A_ (W)w, ++preparecnt);
		1361	array_needsize (prepares, preparemax, preparecnt, (void));
		1362	prepares [preparecnt - 1] = w;
		1363	}
		1364
		1365	void
		1366	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1367	{
		1368	ev_clear_pending (EV_A_ (W)w);
		1369	if (ev_is_active (w))
		1370	return;
		1371
		1372	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1373	ev_stop (EV_A_ (W)w);
		1374	}
		1375
		1376	void
		1377	ev_check_start (EV_P_ struct ev_check *w)
		1378	{
		1379	if (ev_is_active (w))
		1380	return;
		1381
		1382	ev_start (EV_A_ (W)w, ++checkcnt);
		1383	array_needsize (checks, checkmax, checkcnt, (void));
		1384	checks [checkcnt - 1] = w;
		1385	}
		1386
		1387	void
		1388	ev_check_stop (EV_P_ struct ev_check *w)
		1389	{
		1390	ev_clear_pending (EV_A_ (W)w);
		1391	if (ev_is_active (w))
		1392	return;
		1393
		1394	checks [((W)w)->active - 1] = checks [--checkcnt];
		1395	ev_stop (EV_A_ (W)w);
		1396	}
		1397
		1398	#ifndef SA_RESTART
		1399	# define SA_RESTART 0
		1400	#endif
		1401
		1402	void
		1403	ev_signal_start (EV_P_ struct ev_signal *w)
		1404	{
		1405	#if EV_MULTIPLICITY
		1406	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1407	#endif
		1408	if (ev_is_active (w))
		1409	return;
		1410
		1411	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1412
676	ev_start ((W)w, 1);	1413	ev_start (EV_A_ (W)w, 1);
677	array_needsize (signals, signalmax, w->signum, signals_init);	1414	array_needsize (signals, signalmax, w->signum, signals_init);
678	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1415	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
679		1416
680	if (!w->next)	1417	if (!((WL)w)->next)
681	{	1418	{
		1419	#if WIN32
		1420	signal (w->signum, sighandler);
		1421	#else
682	struct sigaction sa;	1422	struct sigaction sa;
683	sa.sa_handler = sighandler;	1423	sa.sa_handler = sighandler;
684	sigfillset (&sa.sa_mask);	1424	sigfillset (&sa.sa_mask);
685	sa.sa_flags = 0;	1425	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
686	sigaction (w->signum, &sa, 0);	1426	sigaction (w->signum, &sa, 0);
		1427	#endif
687	}	1428	}
688	}	1429	}
689		1430
690	void	1431	void
691	evsignal_stop (struct ev_signal *w)	1432	ev_signal_stop (EV_P_ struct ev_signal *w)
692	{	1433	{
		1434	ev_clear_pending (EV_A_ (W)w);
693	if (!ev_is_active (w))	1435	if (!ev_is_active (w))
694	return;	1436	return;
695		1437
696	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1438	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
697	ev_stop ((W)w);	1439	ev_stop (EV_A_ (W)w);
698		1440
699	if (!signals [w->signum - 1].head)	1441	if (!signals [w->signum - 1].head)
700	signal (w->signum, SIG_DFL);	1442	signal (w->signum, SIG_DFL);
701	}	1443	}
702		1444
703	void evidle_start (struct ev_idle *w)	1445	void
		1446	ev_child_start (EV_P_ struct ev_child *w)
704	{	1447	{
		1448	#if EV_MULTIPLICITY
		1449	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1450	#endif
705	if (ev_is_active (w))	1451	if (ev_is_active (w))
706	return;	1452	return;
707		1453
708	ev_start ((W)w, ++idlecnt);	1454	ev_start (EV_A_ (W)w, 1);
709	array_needsize (idles, idlemax, idlecnt, );	1455	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
710	idles [idlecnt - 1] = w;
711	}	1456	}
712		1457
713	void evidle_stop (struct ev_idle *w)	1458	void
		1459	ev_child_stop (EV_P_ struct ev_child *w)
714	{	1460	{
715	idles [w->active - 1] = idles [--idlecnt];	1461	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))	1462	if (ev_is_active (w))
722	return;	1463	return;
723		1464
724	ev_start ((W)w, ++checkcnt);	1465	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);	1466	ev_stop (EV_A_ (W)w);
733	}	1467	}
734		1468
735	/*****************************************************************************/	1469	/*****************************************************************************/
736		1470
737	#if 0	1471	struct ev_once
738
739	static void
740	sin_cb (struct ev_io *w, int revents)
741	{	1472	{
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;	1473	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;	1474	struct ev_timer to;
791	evw_init (&t1, ocb, 0);	1475	void (cb)(int revents, void arg);
792	evtimer_set_abs (&t1, 5, 10);	1476	void *arg;
793	evtimer_start (&t1);	1477	};
794		1478
795	struct ev_signal sig;	1479	static void
796	evw_init (&sig, scb, 65535);	1480	once_cb (EV_P_ struct ev_once *once, int revents)
797	evsignal_set (&sig, SIGQUIT);	1481	{
798	evsignal_start (&sig);	1482	void (cb)(int revents, void arg) = once->cb;
		1483	void *arg = once->arg;
799		1484
800	struct ev_check cw;	1485	ev_io_stop (EV_A_ &once->io);
801	evw_init (&cw, gcb, 0);	1486	ev_timer_stop (EV_A_ &once->to);
802	evcheck_start (&cw);	1487	ev_free (once);
803		1488
804	struct ev_idle iw;	1489	cb (revents, arg);
805	evw_init (&iw, gcb, 0);
806	evidle_start (&iw);
807
808	ev_loop (0);
809
810	return 0;
811	}	1490	}
812		1491
813	#endif	1492	static void
		1493	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1494	{
		1495	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1496	}
814		1497
		1498	static void
		1499	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1500	{
		1501	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1502	}
815		1503
		1504	void
		1505	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1506	{
		1507	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
816		1508
		1509	if (!once)
		1510	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1511	else
		1512	{
		1513	once->cb = cb;
		1514	once->arg = arg;
817		1515
		1516	ev_watcher_init (&once->io, once_cb_io);
		1517	if (fd >= 0)
		1518	{
		1519	ev_io_set (&once->io, fd, events);
		1520	ev_io_start (EV_A_ &once->io);
		1521	}
		1522
		1523	ev_watcher_init (&once->to, once_cb_to);
		1524	if (timeout >= 0.)
		1525	{
		1526	ev_timer_set (&once->to, timeout, 0.);
		1527	ev_timer_start (EV_A_ &once->to);
		1528	}
		1529	}
		1530	}
		1531

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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 1.71 by root, Tue Nov 6 13:17:55 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.11 by root, Wed Oct 31 07:40:49 2007 UTC vs.
Revision 1.71 by root, Tue Nov 6 13:17:55 2007 UTC