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

Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.75 by root, Tue Nov 6 19:29:20 2007 UTC

…		…
		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#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
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
14	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
16	#endif	117	#endif
17		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	122	#endif
20	#define HAVE_SELECT 1	123
		124	/**/
21		125
22	#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) */
23	#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 */
24		130
25	#include "ev.h"	131	#include "ev.h"
26		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		146
27	struct ev_watcher {	147	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
		150
		151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		152
		153	#include "ev_win32.c"
		154
		155	/*****************************************************************************/
		156
		157	static void (syserr_cb)(const char msg);
		158
		159	void ev_set_syserr_cb (void (cb)(const char msg))
		160	{
		161	syserr_cb = cb;
		162	}
		163
		164	static void
		165	syserr (const char *msg)
		166	{
		167	if (!msg)
		168	msg = "(libev) system error";
		169
		170	if (syserr_cb)
		171	syserr_cb (msg);
		172	else
		173	{
		174	perror (msg);
		175	abort ();
		176	}
		177	}
		178
		179	static void (alloc)(void *ptr, long size);
		180
		181	void ev_set_allocator (void (cb)(void *ptr, long size))
		182	{
		183	alloc = cb;
		184	}
		185
		186	static void *
		187	ev_realloc (void *ptr, long size)
		188	{
		189	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		190
		191	if (!ptr && size)
		192	{
		193	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		194	abort ();
		195	}
		196
		197	return ptr;
		198	}
		199
		200	#define ev_malloc(size) ev_realloc (0, (size))
		201	#define ev_free(ptr) ev_realloc ((ptr), 0)
		202
		203	/*****************************************************************************/
		204
		205	typedef struct
		206	{
		207	WL head;
		208	unsigned char events;
		209	unsigned char reify;
		210	} ANFD;
		211
		212	typedef struct
		213	{
		214	W w;
		215	int events;
		216	} ANPENDING;
		217
		218	#if EV_MULTIPLICITY
		219
		220	struct ev_loop
		221	{
		222	# define VAR(name,decl) decl;
		223	# include "ev_vars.h"
29	};	224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
30		227
31	struct ev_watcher_list {	228	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		229
35	static ev_tstamp now, diff; /* monotonic clock */	230	# define VAR(name,decl) static decl;
36	ev_tstamp ev_now;	231	# include "ev_vars.h"
37	int ev_method;	232	# undef VAR
38		233
39	static int have_monotonic; /* runtime */	234	#endif
40
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		235
45	/*****************************************************************************/	236	/*****************************************************************************/
46		237
47	ev_tstamp	238	inline ev_tstamp
48	ev_time (void)	239	ev_time (void)
49	{	240	{
50	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
51	struct timespec ts;	242	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	245	#else
55	struct timeval tv;	246	struct timeval tv;
56	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	249	#endif
59	}	250	}
60		251
61	static ev_tstamp	252	inline ev_tstamp
62	get_clock (void)	253	get_clock (void)
63	{	254	{
64	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
65	if (have_monotonic)	256	if (expect_true (have_monotonic))
66	{	257	{
67	struct timespec ts;	258	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	261	}
71	#endif	262	#endif
72		263
73	return ev_time ();	264	return ev_time ();
74	}	265	}
75		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		274
76	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
77	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
78	{ \	277	{ \
79	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	279	do \
		280	{ \
		281	newcnt = array_roundsize (type, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
81	base = realloc (base, sizeof (base) (newcnt)); \	285	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
82	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	287	cur = newcnt; \
84	}	288	}
		289
		290	#define array_slim(type,stem) \
		291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		292	{ \
		293	stem ## max = array_roundsize (stem ## cnt >> 1); \
		294	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		296	}
		297
		298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		299	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		300	#define array_free_microshit(stem) \
		301	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		302
		303	#define array_free(stem, idx) \
		304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
85		305
86	/*****************************************************************************/	306	/*****************************************************************************/
87		307
88	typedef struct
89	{
90	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */
92	} ANFD;
93
94	static ANFD *anfds;
95	static int anfdmax;
96
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void	308	static void
101	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
102	{	310	{
103	while (count--)	311	while (count--)
104	{	312	{
105	base->head = 0;	313	base->head = 0;
106	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
107	++base;	317	++base;
108	}	318	}
109	}	319	}
110		320
111	typedef struct
112	{
113	struct ev_watcher *w;
114	int events;
115	} ANPENDING;
116
117	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;
119
120	static void	321	static void
121	event (struct ev_watcher *w, int events)	322	event (EV_P_ W w, int events)
122	{	323	{
		324	if (w->pending)
		325	{
		326	pendings [ABSPRI (w)][w->pending - 1].events \|= events;
		327	return;
		328	}
		329
123	w->pending = ++pendingcnt;	330	w->pending = ++pendingcnt [ABSPRI (w)];
124	array_needsize (pendings, pendingmax, pendingcnt, );	331	array_needsize (ANPENDING, pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
125	pendings [pendingcnt - 1].w = w;	332	pendings [ABSPRI (w)][w->pending - 1].w = w;
126	pendings [pendingcnt - 1].events = events;	333	pendings [ABSPRI (w)][w->pending - 1].events = events;
127	}	334	}
128		335
129	static void	336	static void
		337	queue_events (EV_P_ W *events, int eventcnt, int type)
		338	{
		339	int i;
		340
		341	for (i = 0; i < eventcnt; ++i)
		342	event (EV_A_ events [i], type);
		343	}
		344
		345	static void
130	fd_event (int fd, int events)	346	fd_event (EV_P_ int fd, int events)
131	{	347	{
132	ANFD *anfd = anfds + fd;	348	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	349	struct ev_io *w;
134		350
135	for (w = anfd->head; w; w = w->next)	351	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
136	{	352	{
137	int ev = w->events & events;	353	int ev = w->events & events;
138		354
139	if (ev)	355	if (ev)
140	event ((struct ev_watcher *)w, ev);	356	event (EV_A_ (W)w, ev);
141	}	357	}
142	}	358	}
143		359
		360	/*****************************************************************************/
		361
144	static void	362	static void
145	queue_events (struct ev_watcher **events, int eventcnt, int type)	363	fd_reify (EV_P)
146	{	364	{
147	int i;	365	int i;
148		366
149	for (i = 0; i < eventcnt; ++i)	367	for (i = 0; i < fdchangecnt; ++i)
150	event (events [i], type);	368	{
		369	int fd = fdchanges [i];
		370	ANFD *anfd = anfds + fd;
		371	struct ev_io *w;
		372
		373	int events = 0;
		374
		375	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		376	events \|= w->events;
		377
		378	anfd->reify = 0;
		379
		380	method_modify (EV_A_ fd, anfd->events, events);
		381	anfd->events = events;
		382	}
		383
		384	fdchangecnt = 0;
		385	}
		386
		387	static void
		388	fd_change (EV_P_ int fd)
		389	{
		390	if (anfds [fd].reify)
		391	return;
		392
		393	anfds [fd].reify = 1;
		394
		395	++fdchangecnt;
		396	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		397	fdchanges [fdchangecnt - 1] = fd;
		398	}
		399
		400	static void
		401	fd_kill (EV_P_ int fd)
		402	{
		403	struct ev_io *w;
		404
		405	while ((w = (struct ev_io *)anfds [fd].head))
		406	{
		407	ev_io_stop (EV_A_ w);
		408	event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		409	}
		410	}
		411
		412	static int
		413	fd_valid (int fd)
		414	{
		415	#ifdef WIN32
		416	return !!win32_get_osfhandle (fd);
		417	#else
		418	return fcntl (fd, F_GETFD) != -1;
		419	#endif
		420	}
		421
		422	/* called on EBADF to verify fds */
		423	static void
		424	fd_ebadf (EV_P)
		425	{
		426	int fd;
		427
		428	for (fd = 0; fd < anfdmax; ++fd)
		429	if (anfds [fd].events)
		430	if (!fd_valid (fd) == -1 && errno == EBADF)
		431	fd_kill (EV_A_ fd);
		432	}
		433
		434	/* called on ENOMEM in select/poll to kill some fds and retry */
		435	static void
		436	fd_enomem (EV_P)
		437	{
		438	int fd;
		439
		440	for (fd = anfdmax; fd--; )
		441	if (anfds [fd].events)
		442	{
		443	fd_kill (EV_A_ fd);
		444	return;
		445	}
		446	}
		447
		448	/* usually called after fork if method needs to re-arm all fds from scratch */
		449	static void
		450	fd_rearm_all (EV_P)
		451	{
		452	int fd;
		453
		454	/* this should be highly optimised to not do anything but set a flag */
		455	for (fd = 0; fd < anfdmax; ++fd)
		456	if (anfds [fd].events)
		457	{
		458	anfds [fd].events = 0;
		459	fd_change (EV_A_ fd);
		460	}
151	}	461	}
152		462
153	/*****************************************************************************/	463	/*****************************************************************************/
154		464
155	static struct ev_timer **atimers;
156	static int atimermax, atimercnt;
157
158	static struct ev_timer **rtimers;
159	static int rtimermax, rtimercnt;
160
161	static void	465	static void
162	upheap (struct ev_timer **timers, int k)	466	upheap (WT *heap, int k)
163	{	467	{
164	struct ev_timer *w = timers [k];	468	WT w = heap [k];
165		469
166	while (k && timers [k >> 1]->at > w->at)	470	while (k && heap [k >> 1]->at > w->at)
167	{	471	{
168	timers [k] = timers [k >> 1];	472	heap [k] = heap [k >> 1];
169	timers [k]->active = k + 1;	473	((W)heap [k])->active = k + 1;
170	k >>= 1;	474	k >>= 1;
171	}	475	}
172		476
173	timers [k] = w;	477	heap [k] = w;
174	timers [k]->active = k + 1;	478	((W)heap [k])->active = k + 1;
175		479
176	}	480	}
177		481
178	static void	482	static void
179	downheap (struct ev_timer **timers, int N, int k)	483	downheap (WT *heap, int N, int k)
180	{	484	{
181	struct ev_timer *w = timers [k];	485	WT w = heap [k];
182		486
183	while (k < (N >> 1))	487	while (k < (N >> 1))
184	{	488	{
185	int j = k << 1;	489	int j = k << 1;
186		490
187	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	491	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
188	++j;	492	++j;
189		493
190	if (w->at <= timers [j]->at)	494	if (w->at <= heap [j]->at)
191	break;	495	break;
192		496
193	timers [k] = timers [j];	497	heap [k] = heap [j];
194	timers [k]->active = k + 1;	498	((W)heap [k])->active = k + 1;
195	k = j;	499	k = j;
196	}	500	}
197		501
198	timers [k] = w;	502	heap [k] = w;
199	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
200	}	504	}
201		505
202	/*****************************************************************************/	506	/*****************************************************************************/
203		507
204	typedef struct	508	typedef struct
205	{	509	{
206	struct ev_signal *head;	510	WL head;
207	sig_atomic_t gotsig;	511	sig_atomic_t volatile gotsig;
208	} ANSIG;	512	} ANSIG;
209		513
210	static ANSIG *signals;	514	static ANSIG *signals;
211	static int signalmax;	515	static int signalmax;
212		516
213	static int sigpipe [2];	517	static int sigpipe [2];
214	static sig_atomic_t gotsig;	518	static sig_atomic_t volatile gotsig;
215	static struct ev_io sigev;	519	static struct ev_io sigev;
216		520
217	static void	521	static void
218	signals_init (ANSIG *base, int count)	522	signals_init (ANSIG *base, int count)
219	{	523	{
220	while (count--)	524	while (count--)
221	{	525	{
222	base->head = 0;	526	base->head = 0;
223	base->gotsig = 0;	527	base->gotsig = 0;
		528
224	++base;	529	++base;
225	}	530	}
226	}	531	}
227		532
228	static void	533	static void
229	sighandler (int signum)	534	sighandler (int signum)
230	{	535	{
		536	#if WIN32
		537	signal (signum, sighandler);
		538	#endif
		539
231	signals [signum - 1].gotsig = 1;	540	signals [signum - 1].gotsig = 1;
232		541
233	if (!gotsig)	542	if (!gotsig)
234	{	543	{
		544	int old_errno = errno;
235	gotsig = 1;	545	gotsig = 1;
		546	#ifdef WIN32
		547	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		548	#else
236	write (sigpipe [1], &gotsig, 1);	549	write (sigpipe [1], &signum, 1);
		550	#endif
		551	errno = old_errno;
237	}	552	}
238	}	553	}
239		554
240	static void	555	static void
241	sigcb (struct ev_io *iow, int revents)	556	sigcb (EV_P_ struct ev_io *iow, int revents)
242	{	557	{
243	struct ev_signal *w;	558	WL w;
244	int sig;	559	int signum;
245		560
		561	#ifdef WIN32
		562	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		563	#else
		564	read (sigpipe [0], &revents, 1);
		565	#endif
246	gotsig = 0;	566	gotsig = 0;
247	read (sigpipe [0], &revents, 1);
248		567
249	for (sig = signalmax; sig--; )	568	for (signum = signalmax; signum--; )
250	if (signals [sig].gotsig)	569	if (signals [signum].gotsig)
251	{	570	{
252	signals [sig].gotsig = 0;	571	signals [signum].gotsig = 0;
253		572
254	for (w = signals [sig].head; w; w = w->next)	573	for (w = signals [signum].head; w; w = w->next)
255	event ((struct ev_watcher *)w, EV_SIGNAL);	574	event (EV_A_ (W)w, EV_SIGNAL);
256	}	575	}
257	}	576	}
258		577
259	static void	578	static void
260	siginit (void)	579	siginit (EV_P)
261	{	580	{
		581	#ifndef WIN32
262	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	582	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
263	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	583	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
264		584
265	/* rather than sort out wether we really need nb, set it */	585	/* rather than sort out wether we really need nb, set it */
266	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	586	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
267	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	587	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		588	#endif
268		589
269	evio_set (&sigev, sigpipe [0], EV_READ);	590	ev_io_set (&sigev, sigpipe [0], EV_READ);
270	evio_start (&sigev);	591	ev_io_start (EV_A_ &sigev);
		592	ev_unref (EV_A); /* child watcher should not keep loop alive */
271	}	593	}
272		594
273	/*****************************************************************************/	595	/*****************************************************************************/
274		596
275	static struct ev_idle **idles;	597	static struct ev_child *childs [PID_HASHSIZE];
276	static int idlemax, idlecnt;
277		598
278	static struct ev_check **checks;	599	#ifndef WIN32
279	static int checkmax, checkcnt;	600
		601	static struct ev_signal childev;
		602
		603	#ifndef WCONTINUED
		604	# define WCONTINUED 0
		605	#endif
		606
		607	static void
		608	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		609	{
		610	struct ev_child *w;
		611
		612	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		613	if (w->pid == pid \|\| !w->pid)
		614	{
		615	ev_priority (w) = ev_priority (sw); /* need to do it now */
		616	w->rpid = pid;
		617	w->rstatus = status;
		618	event (EV_A_ (W)w, EV_CHILD);
		619	}
		620	}
		621
		622	static void
		623	childcb (EV_P_ struct ev_signal *sw, int revents)
		624	{
		625	int pid, status;
		626
		627	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		628	{
		629	/* make sure we are called again until all childs have been reaped */
		630	event (EV_A_ (W)sw, EV_SIGNAL);
		631
		632	child_reap (EV_A_ sw, pid, pid, status);
		633	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		634	}
		635	}
		636
		637	#endif
280		638
281	/*****************************************************************************/	639	/*****************************************************************************/
282		640
		641	#if EV_USE_KQUEUE
		642	# include "ev_kqueue.c"
		643	#endif
283	#if HAVE_EPOLL	644	#if EV_USE_EPOLL
284	# include "ev_epoll.c"	645	# include "ev_epoll.c"
285	#endif	646	#endif
		647	#if EV_USE_POLL
		648	# include "ev_poll.c"
		649	#endif
286	#if HAVE_SELECT	650	#if EV_USE_SELECT
287	# include "ev_select.c"	651	# include "ev_select.c"
288	#endif	652	#endif
289		653
290	int ev_init (int flags)	654	int
		655	ev_version_major (void)
291	{	656	{
		657	return EV_VERSION_MAJOR;
		658	}
		659
		660	int
		661	ev_version_minor (void)
		662	{
		663	return EV_VERSION_MINOR;
		664	}
		665
		666	/* return true if we are running with elevated privileges and should ignore env variables */
		667	static int
		668	enable_secure (void)
		669	{
		670	#ifdef WIN32
		671	return 0;
		672	#else
		673	return getuid () != geteuid ()
		674	\|\| getgid () != getegid ();
		675	#endif
		676	}
		677
		678	int
		679	ev_method (EV_P)
		680	{
		681	return method;
		682	}
		683
		684	static void
		685	loop_init (EV_P_ int methods)
		686	{
		687	if (!method)
		688	{
292	#if HAVE_MONOTONIC	689	#if EV_USE_MONOTONIC
293	{	690	{
294	struct timespec ts;	691	struct timespec ts;
295	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	692	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296	have_monotonic = 1;	693	have_monotonic = 1;
297	}	694	}
298	#endif	695	#endif
299		696
300	ev_now = ev_time ();	697	rt_now = ev_time ();
301	now = get_clock ();	698	mn_now = get_clock ();
302	diff = ev_now - now;	699	now_floor = mn_now;
		700	rtmn_diff = rt_now - mn_now;
303		701
		702	if (methods == EVMETHOD_AUTO)
		703	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		704	methods = atoi (getenv ("LIBEV_METHODS"));
		705	else
		706	methods = EVMETHOD_ANY;
		707
		708	method = 0;
		709	#if EV_USE_WIN32
		710	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		711	#endif
		712	#if EV_USE_KQUEUE
		713	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		714	#endif
		715	#if EV_USE_EPOLL
		716	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		717	#endif
		718	#if EV_USE_POLL
		719	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		720	#endif
		721	#if EV_USE_SELECT
		722	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		723	#endif
		724
		725	ev_watcher_init (&sigev, sigcb);
		726	ev_set_priority (&sigev, EV_MAXPRI);
		727	}
		728	}
		729
		730	void
		731	loop_destroy (EV_P)
		732	{
		733	int i;
		734
		735	#if EV_USE_WIN32
		736	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		737	#endif
		738	#if EV_USE_KQUEUE
		739	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		740	#endif
		741	#if EV_USE_EPOLL
		742	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		743	#endif
		744	#if EV_USE_POLL
		745	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		746	#endif
		747	#if EV_USE_SELECT
		748	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		749	#endif
		750
		751	for (i = NUMPRI; i--; )
		752	array_free (pending, [i]);
		753
		754	/* have to use the microsoft-never-gets-it-right macro */
		755	array_free_microshit (fdchange);
		756	array_free_microshit (timer);
		757	array_free_microshit (periodic);
		758	array_free_microshit (idle);
		759	array_free_microshit (prepare);
		760	array_free_microshit (check);
		761
		762	method = 0;
		763	}
		764
		765	static void
		766	loop_fork (EV_P)
		767	{
		768	#if EV_USE_EPOLL
		769	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		770	#endif
		771	#if EV_USE_KQUEUE
		772	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		773	#endif
		774
		775	if (ev_is_active (&sigev))
		776	{
		777	/* default loop */
		778
		779	ev_ref (EV_A);
		780	ev_io_stop (EV_A_ &sigev);
		781	close (sigpipe [0]);
		782	close (sigpipe [1]);
		783
		784	while (pipe (sigpipe))
		785	syserr ("(libev) error creating pipe");
		786
		787	siginit (EV_A);
		788	}
		789
		790	postfork = 0;
		791	}
		792
		793	#if EV_MULTIPLICITY
		794	struct ev_loop *
		795	ev_loop_new (int methods)
		796	{
		797	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		798
		799	memset (loop, 0, sizeof (struct ev_loop));
		800
		801	loop_init (EV_A_ methods);
		802
		803	if (ev_method (EV_A))
		804	return loop;
		805
		806	return 0;
		807	}
		808
		809	void
		810	ev_loop_destroy (EV_P)
		811	{
		812	loop_destroy (EV_A);
		813	ev_free (loop);
		814	}
		815
		816	void
		817	ev_loop_fork (EV_P)
		818	{
		819	postfork = 1;
		820	}
		821
		822	#endif
		823
		824	#if EV_MULTIPLICITY
		825	struct ev_loop default_loop_struct;
		826	static struct ev_loop *default_loop;
		827
		828	struct ev_loop *
		829	#else
		830	static int default_loop;
		831
		832	int
		833	#endif
		834	ev_default_loop (int methods)
		835	{
		836	if (sigpipe [0] == sigpipe [1])
304	if (pipe (sigpipe))	837	if (pipe (sigpipe))
305	return 0;	838	return 0;
306		839
307	ev_method = EVMETHOD_NONE;	840	if (!default_loop)
308	#if HAVE_EPOLL	841	{
309	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	842	#if EV_MULTIPLICITY
		843	struct ev_loop *loop = default_loop = &default_loop_struct;
		844	#else
		845	default_loop = 1;
310	#endif	846	#endif
311	#if HAVE_SELECT
312	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	#endif
314		847
		848	loop_init (EV_A_ methods);
		849
		850	if (ev_method (EV_A))
		851	{
		852	siginit (EV_A);
		853
		854	#ifndef WIN32
		855	ev_signal_init (&childev, childcb, SIGCHLD);
		856	ev_set_priority (&childev, EV_MAXPRI);
		857	ev_signal_start (EV_A_ &childev);
		858	ev_unref (EV_A); /* child watcher should not keep loop alive */
		859	#endif
		860	}
		861	else
		862	default_loop = 0;
		863	}
		864
		865	return default_loop;
		866	}
		867
		868	void
		869	ev_default_destroy (void)
		870	{
		871	#if EV_MULTIPLICITY
		872	struct ev_loop *loop = default_loop;
		873	#endif
		874
		875	#ifndef WIN32
		876	ev_ref (EV_A); /* child watcher */
		877	ev_signal_stop (EV_A_ &childev);
		878	#endif
		879
		880	ev_ref (EV_A); /* signal watcher */
		881	ev_io_stop (EV_A_ &sigev);
		882
		883	close (sigpipe [0]); sigpipe [0] = 0;
		884	close (sigpipe [1]); sigpipe [1] = 0;
		885
		886	loop_destroy (EV_A);
		887	}
		888
		889	void
		890	ev_default_fork (void)
		891	{
		892	#if EV_MULTIPLICITY
		893	struct ev_loop *loop = default_loop;
		894	#endif
		895
315	if (ev_method)	896	if (method)
316	{	897	postfork = 1;
317	evw_init (&sigev, sigcb, 0);
318	siginit ();
319	}
320
321	return ev_method;
322	}	898	}
323		899
324	/*****************************************************************************/	900	/*****************************************************************************/
325		901
326	void ev_prefork (void)
327	{
328	}
329
330	void ev_postfork_parent (void)
331	{
332	}
333
334	void ev_postfork_child (void)
335	{
336	#if HAVE_EPOLL
337	if (ev_method == EVMETHOD_EPOLL)
338	epoll_postfork_child ();
339	#endif
340
341	evio_stop (&sigev);
342	close (sigpipe [0]);
343	close (sigpipe [1]);
344	pipe (sigpipe);
345	siginit ();
346	}
347
348	/*****************************************************************************/
349
350	static void	902	static void
351	fd_reify (void)	903	call_pending (EV_P)
352	{	904	{
353	int i;	905	int pri;
354		906
355	for (i = 0; i < fdchangecnt; ++i)	907	for (pri = NUMPRI; pri--; )
356	{	908	while (pendingcnt [pri])
357	int fd = fdchanges [i];
358	ANFD *anfd = anfds + fd;
359	struct ev_io *w;
360
361	int wev = 0;
362
363	for (w = anfd->head; w; w = w->next)
364	wev \|= w->events;
365
366	if (anfd->wev != wev)
367	{	909	{
368	method_modify (fd, anfd->wev, wev);	910	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
369	anfd->wev = wev;
370	}
371	}
372		911
373	fdchangecnt = 0;
374	}
375
376	static void
377	call_pending ()
378	{
379	int i;
380
381	for (i = 0; i < pendingcnt; ++i)
382	{
383	ANPENDING *p = pendings + i;
384
385	if (p->w)	912	if (p->w)
386	{	913	{
387	p->w->pending = 0;	914	p->w->pending = 0;
388	p->w->cb (p->w, p->events);	915	p->w->cb (EV_A_ p->w, p->events);
389	}	916	}
390	}	917	}
391
392	pendingcnt = 0;
393	}	918	}
394		919
395	static void	920	static void
396	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	921	timers_reify (EV_P)
397	{	922	{
398	while (timercnt && timers [0]->at <= now)	923	while (timercnt && ((WT)timers [0])->at <= mn_now)
399	{	924	{
400	struct ev_timer *w = timers [0];	925	struct ev_timer *w = timers [0];
		926
		927	assert (("inactive timer on timer heap detected", ev_is_active (w)));
401		928
402	/* first reschedule or stop timer */	929	/* first reschedule or stop timer */
403	if (w->repeat)	930	if (w->repeat)
404	{	931	{
405	if (w->is_abs)	932	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
406	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
407	else
408	w->at = now + w->repeat;	933	((WT)w)->at = mn_now + w->repeat;
409
410	assert (w->at > now);
411
412	downheap (timers, timercnt, 0);	934	downheap ((WT *)timers, timercnt, 0);
413	}	935	}
414	else	936	else
		937	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		938
		939	event (EV_A_ (W)w, EV_TIMEOUT);
		940	}
		941	}
		942
		943	static void
		944	periodics_reify (EV_P)
		945	{
		946	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		947	{
		948	struct ev_periodic *w = periodics [0];
		949
		950	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		951
		952	/* first reschedule or stop timer */
		953	if (w->interval)
415	{	954	{
416	evtimer_stop (w); /* nonrepeating: stop timer */	955	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
417	--timercnt; /* maybe pass by reference instead? */	956	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		957	downheap ((WT *)periodics, periodiccnt, 0);
418	}	958	}
		959	else
		960	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
419		961
420	event ((struct ev_watcher *)w, EV_TIMEOUT);	962	event (EV_A_ (W)w, EV_PERIODIC);
421	}	963	}
422	}	964	}
423		965
424	static void	966	static void
425	time_update ()	967	periodics_reschedule (EV_P)
426	{	968	{
427	int i;	969	int i;
428	ev_now = ev_time ();
429		970
430	if (have_monotonic)	971	/* adjust periodics after time jump */
		972	for (i = 0; i < periodiccnt; ++i)
431	{	973	{
432	ev_tstamp odiff = diff;	974	struct ev_periodic *w = periodics [i];
433		975
434	/* detecting time jumps is much more difficult */	976	if (w->interval)
435	for (i = 2; --i; ) /* loop a few times, before making important decisions */
436	{	977	{
437	now = get_clock ();	978	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
438	diff = ev_now - now;
439		979
440	if (fabs (odiff - diff) < MIN_TIMEJUMP)	980	if (fabs (diff) >= 1e-4)
441	return; /* all is well */	981	{
		982	ev_periodic_stop (EV_A_ w);
		983	ev_periodic_start (EV_A_ w);
442		984
443	ev_now = ev_time ();	985	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		986	}
444	}	987	}
		988	}
		989	}
445		990
446	/* time jump detected, reschedule atimers */	991	inline int
447	for (i = 0; i < atimercnt; ++i)	992	time_update_monotonic (EV_P)
		993	{
		994	mn_now = get_clock ();
		995
		996	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		997	{
		998	rt_now = rtmn_diff + mn_now;
		999	return 0;
		1000	}
		1001	else
		1002	{
		1003	now_floor = mn_now;
		1004	rt_now = ev_time ();
		1005	return 1;
		1006	}
		1007	}
		1008
		1009	static void
		1010	time_update (EV_P)
		1011	{
		1012	int i;
		1013
		1014	#if EV_USE_MONOTONIC
		1015	if (expect_true (have_monotonic))
		1016	{
		1017	if (time_update_monotonic (EV_A))
448	{	1018	{
449	struct ev_timer *w = atimers [i];	1019	ev_tstamp odiff = rtmn_diff;
450	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1020
		1021	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1022	{
		1023	rtmn_diff = rt_now - mn_now;
		1024
		1025	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1026	return; /* all is well */
		1027
		1028	rt_now = ev_time ();
		1029	mn_now = get_clock ();
		1030	now_floor = mn_now;
		1031	}
		1032
		1033	periodics_reschedule (EV_A);
		1034	/* no timer adjustment, as the monotonic clock doesn't jump */
		1035	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
451	}	1036	}
452	}	1037	}
453	else	1038	else
		1039	#endif
454	{	1040	{
455	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1041	rt_now = ev_time ();
456	/* time jump detected, adjust rtimers */	1042
		1043	if (expect_false (mn_now > rt_now \|\| mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1044	{
		1045	periodics_reschedule (EV_A);
		1046
		1047	/* adjust timers. this is easy, as the offset is the same for all */
457	for (i = 0; i < rtimercnt; ++i)	1048	for (i = 0; i < timercnt; ++i)
458	rtimers [i]->at += ev_now - now;	1049	((WT)timers [i])->at += rt_now - mn_now;
		1050	}
459		1051
460	now = ev_now;	1052	mn_now = rt_now;
461	}	1053	}
462	}	1054	}
463		1055
464	int ev_loop_done;	1056	void
		1057	ev_ref (EV_P)
		1058	{
		1059	++activecnt;
		1060	}
465		1061
		1062	void
		1063	ev_unref (EV_P)
		1064	{
		1065	--activecnt;
		1066	}
		1067
		1068	static int loop_done;
		1069
		1070	void
466	void ev_loop (int flags)	1071	ev_loop (EV_P_ int flags)
467	{	1072	{
468	double block;	1073	double block;
469	ev_loop_done = flags & EVLOOP_ONESHOT;	1074	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
470
471	if (checkcnt)
472	{
473	queue_events (checks, checkcnt, EV_CHECK);
474	call_pending ();
475	}
476		1075
477	do	1076	do
478	{	1077	{
		1078	/* queue check watchers (and execute them) */
		1079	if (expect_false (preparecnt))
		1080	{
		1081	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1082	call_pending (EV_A);
		1083	}
		1084
		1085	/* we might have forked, so reify kernel state if necessary */
		1086	if (expect_false (postfork))
		1087	loop_fork (EV_A);
		1088
479	/* update fd-related kernel structures */	1089	/* update fd-related kernel structures */
480	fd_reify ();	1090	fd_reify (EV_A);
481		1091
482	/* calculate blocking time */	1092	/* calculate blocking time */
		1093
		1094	/* we only need this for !monotonic clockor timers, but as we basically
		1095	always have timers, we just calculate it always */
		1096	#if EV_USE_MONOTONIC
		1097	if (expect_true (have_monotonic))
		1098	time_update_monotonic (EV_A);
		1099	else
		1100	#endif
		1101	{
		1102	rt_now = ev_time ();
		1103	mn_now = rt_now;
		1104	}
		1105
483	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1106	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
484	block = 0.;	1107	block = 0.;
485	else	1108	else
486	{	1109	{
487	block = MAX_BLOCKTIME;	1110	block = MAX_BLOCKTIME;
488		1111
489	if (rtimercnt)	1112	if (timercnt)
490	{	1113	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1114	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
492	if (block > to) block = to;	1115	if (block > to) block = to;
493	}	1116	}
494		1117
495	if (atimercnt)	1118	if (periodiccnt)
496	{	1119	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1120	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
498	if (block > to) block = to;	1121	if (block > to) block = to;
499	}	1122	}
500		1123
501	if (block < 0.) block = 0.;	1124	if (block < 0.) block = 0.;
502	}	1125	}
503		1126
504	method_poll (block);	1127	method_poll (EV_A_ block);
505		1128
506	/* update ev_now, do magic */	1129	/* update rt_now, do magic */
507	time_update ();	1130	time_update (EV_A);
508		1131
509	/* queue pending timers and reschedule them */	1132	/* queue pending timers and reschedule them */
510	/* absolute timers first */	1133	timers_reify (EV_A); /* relative timers called last */
511	timers_reify (atimers, atimercnt, ev_now);	1134	periodics_reify (EV_A); /* absolute timers called first */
512	/* relative timers second */
513	timers_reify (rtimers, rtimercnt, now);
514		1135
515	/* queue idle watchers unless io or timers are pending */	1136	/* queue idle watchers unless io or timers are pending */
516	if (!pendingcnt)	1137	if (!pendingcnt)
517	queue_events (idles, idlecnt, EV_IDLE);	1138	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
518		1139
519	/* queue check and possibly idle watchers */	1140	/* queue check watchers, to be executed first */
		1141	if (checkcnt)
520	queue_events (checks, checkcnt, EV_CHECK);	1142	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
521		1143
522	call_pending ();	1144	call_pending (EV_A);
523	}	1145	}
524	while (!ev_loop_done);	1146	while (activecnt && !loop_done);
		1147
		1148	if (loop_done != 2)
		1149	loop_done = 0;
		1150	}
		1151
		1152	void
		1153	ev_unloop (EV_P_ int how)
		1154	{
		1155	loop_done = how;
525	}	1156	}
526		1157
527	/*****************************************************************************/	1158	/*****************************************************************************/
528		1159
529	static void	1160	inline void
530	wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)	1161	wlist_add (WL *head, WL elem)
531	{	1162	{
532	elem->next = *head;	1163	elem->next = *head;
533	*head = elem;	1164	*head = elem;
534	}	1165	}
535		1166
536	static void	1167	inline void
537	wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)	1168	wlist_del (WL *head, WL elem)
538	{	1169	{
539	while (*head)	1170	while (*head)
540	{	1171	{
541	if (*head == elem)	1172	if (*head == elem)
542	{	1173	{
546		1177
547	head = &(*head)->next;	1178	head = &(*head)->next;
548	}	1179	}
549	}	1180	}
550		1181
551	static void	1182	inline void
552	ev_start (struct ev_watcher *w, int active)	1183	ev_clear_pending (EV_P_ W w)
553	{	1184	{
		1185	if (w->pending)
		1186	{
		1187	pendings [ABSPRI (w)][w->pending - 1].w = 0;
554	w->pending = 0;	1188	w->pending = 0;
		1189	}
		1190	}
		1191
		1192	inline void
		1193	ev_start (EV_P_ W w, int active)
		1194	{
		1195	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1196	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1197
555	w->active = active;	1198	w->active = active;
		1199	ev_ref (EV_A);
556	}	1200	}
557		1201
558	static void	1202	inline void
559	ev_stop (struct ev_watcher *w)	1203	ev_stop (EV_P_ W w)
560	{	1204	{
561	if (w->pending)	1205	ev_unref (EV_A);
562	pendings [w->pending - 1].w = 0;
563
564	w->active = 0;	1206	w->active = 0;
565	/* nop */
566	}	1207	}
567		1208
568	/*****************************************************************************/	1209	/*****************************************************************************/
569		1210
570	void	1211	void
571	evio_start (struct ev_io *w)	1212	ev_io_start (EV_P_ struct ev_io *w)
572	{	1213	{
		1214	int fd = w->fd;
		1215
573	if (ev_is_active (w))	1216	if (ev_is_active (w))
574	return;	1217	return;
575		1218
576	int fd = w->fd;	1219	assert (("ev_io_start called with negative fd", fd >= 0));
577		1220
578	ev_start ((struct ev_watcher *)w, 1);	1221	ev_start (EV_A_ (W)w, 1);
579	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1222	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
580	wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);	1223	wlist_add ((WL *)&anfds[fd].head, (WL)w);
581		1224
582	++fdchangecnt;	1225	fd_change (EV_A_ fd);
583	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584	fdchanges [fdchangecnt - 1] = fd;
585	}	1226	}
586		1227
587	void	1228	void
588	evio_stop (struct ev_io *w)	1229	ev_io_stop (EV_P_ struct ev_io *w)
589	{	1230	{
		1231	ev_clear_pending (EV_A_ (W)w);
590	if (!ev_is_active (w))	1232	if (!ev_is_active (w))
591	return;	1233	return;
592		1234
593	wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);	1235	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
594	ev_stop ((struct ev_watcher *)w);	1236	ev_stop (EV_A_ (W)w);
595		1237
596	++fdchangecnt;	1238	fd_change (EV_A_ w->fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = w->fd;
599	}	1239	}
600		1240
601	void	1241	void
602	evtimer_start (struct ev_timer *w)	1242	ev_timer_start (EV_P_ struct ev_timer *w)
603	{	1243	{
604	if (ev_is_active (w))	1244	if (ev_is_active (w))
605	return;	1245	return;
606		1246
607	if (w->is_abs)	1247	((WT)w)->at += mn_now;
		1248
		1249	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1250
		1251	ev_start (EV_A_ (W)w, ++timercnt);
		1252	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1253	timers [timercnt - 1] = w;
		1254	upheap ((WT *)timers, timercnt - 1);
		1255
		1256	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1257	}
		1258
		1259	void
		1260	ev_timer_stop (EV_P_ struct ev_timer *w)
		1261	{
		1262	ev_clear_pending (EV_A_ (W)w);
		1263	if (!ev_is_active (w))
		1264	return;
		1265
		1266	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1267
		1268	if (((W)w)->active < timercnt--)
		1269	{
		1270	timers [((W)w)->active - 1] = timers [timercnt];
		1271	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
608	{	1272	}
609	/* this formula differs from the one in timer_reify becuse we do not round up */	1273
		1274	((WT)w)->at = w->repeat;
		1275
		1276	ev_stop (EV_A_ (W)w);
		1277	}
		1278
		1279	void
		1280	ev_timer_again (EV_P_ struct ev_timer *w)
		1281	{
		1282	if (ev_is_active (w))
		1283	{
610	if (w->repeat)	1284	if (w->repeat)
611	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1285	{
612		1286	((WT)w)->at = mn_now + w->repeat;
613	ev_start ((struct ev_watcher *)w, ++atimercnt);	1287	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
614	array_needsize (atimers, atimermax, atimercnt, );	1288	}
615	atimers [atimercnt - 1] = w;
616	upheap (atimers, atimercnt - 1);
617	}
618	else	1289	else
		1290	ev_timer_stop (EV_A_ w);
619	{	1291	}
620	w->at += now;	1292	else if (w->repeat)
621		1293	ev_timer_start (EV_A_ w);
622	ev_start ((struct ev_watcher *)w, ++rtimercnt);
623	array_needsize (rtimers, rtimermax, rtimercnt, );
624	rtimers [rtimercnt - 1] = w;
625	upheap (rtimers, rtimercnt - 1);
626	}
627
628	}	1294	}
629		1295
630	void	1296	void
631	evtimer_stop (struct ev_timer *w)	1297	ev_periodic_start (EV_P_ struct ev_periodic *w)
632	{	1298	{
		1299	if (ev_is_active (w))
		1300	return;
		1301
		1302	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1303
		1304	/* this formula differs from the one in periodic_reify because we do not always round up */
		1305	if (w->interval)
		1306	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1307
		1308	ev_start (EV_A_ (W)w, ++periodiccnt);
		1309	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1310	periodics [periodiccnt - 1] = w;
		1311	upheap ((WT *)periodics, periodiccnt - 1);
		1312
		1313	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1314	}
		1315
		1316	void
		1317	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1318	{
		1319	ev_clear_pending (EV_A_ (W)w);
633	if (!ev_is_active (w))	1320	if (!ev_is_active (w))
634	return;	1321	return;
635		1322
636	if (w->is_abs)	1323	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
637	{	1324
638	if (w->active < atimercnt--)	1325	if (((W)w)->active < periodiccnt--)
639	{
640	atimers [w->active - 1] = atimers [atimercnt];
641	downheap (atimers, atimercnt, w->active - 1);
642	}
643	}	1326	{
644	else	1327	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1328	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
645	{	1329	}
646	if (w->active < rtimercnt--)
647	{
648	rtimers [w->active - 1] = rtimers [rtimercnt];
649	downheap (rtimers, rtimercnt, w->active - 1);
650	}
651	}
652		1330
653	ev_stop ((struct ev_watcher *)w);	1331	ev_stop (EV_A_ (W)w);
654	}	1332	}
655		1333
656	void	1334	void
657	evsignal_start (struct ev_signal *w)	1335	ev_idle_start (EV_P_ struct ev_idle *w)
658	{	1336	{
659	if (ev_is_active (w))	1337	if (ev_is_active (w))
660	return;	1338	return;
661		1339
662	ev_start ((struct ev_watcher *)w, 1);	1340	ev_start (EV_A_ (W)w, ++idlecnt);
		1341	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1342	idles [idlecnt - 1] = w;
		1343	}
		1344
		1345	void
		1346	ev_idle_stop (EV_P_ struct ev_idle *w)
		1347	{
		1348	ev_clear_pending (EV_A_ (W)w);
		1349	if (ev_is_active (w))
		1350	return;
		1351
		1352	idles [((W)w)->active - 1] = idles [--idlecnt];
		1353	ev_stop (EV_A_ (W)w);
		1354	}
		1355
		1356	void
		1357	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1358	{
		1359	if (ev_is_active (w))
		1360	return;
		1361
		1362	ev_start (EV_A_ (W)w, ++preparecnt);
		1363	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1364	prepares [preparecnt - 1] = w;
		1365	}
		1366
		1367	void
		1368	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1369	{
		1370	ev_clear_pending (EV_A_ (W)w);
		1371	if (ev_is_active (w))
		1372	return;
		1373
		1374	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1375	ev_stop (EV_A_ (W)w);
		1376	}
		1377
		1378	void
		1379	ev_check_start (EV_P_ struct ev_check *w)
		1380	{
		1381	if (ev_is_active (w))
		1382	return;
		1383
		1384	ev_start (EV_A_ (W)w, ++checkcnt);
		1385	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1386	checks [checkcnt - 1] = w;
		1387	}
		1388
		1389	void
		1390	ev_check_stop (EV_P_ struct ev_check *w)
		1391	{
		1392	ev_clear_pending (EV_A_ (W)w);
		1393	if (ev_is_active (w))
		1394	return;
		1395
		1396	checks [((W)w)->active - 1] = checks [--checkcnt];
		1397	ev_stop (EV_A_ (W)w);
		1398	}
		1399
		1400	#ifndef SA_RESTART
		1401	# define SA_RESTART 0
		1402	#endif
		1403
		1404	void
		1405	ev_signal_start (EV_P_ struct ev_signal *w)
		1406	{
		1407	#if EV_MULTIPLICITY
		1408	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1409	#endif
		1410	if (ev_is_active (w))
		1411	return;
		1412
		1413	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1414
		1415	ev_start (EV_A_ (W)w, 1);
663	array_needsize (signals, signalmax, w->signum, signals_init);	1416	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
664	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	1417	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
665		1418
666	if (!w->next)	1419	if (!((WL)w)->next)
667	{	1420	{
		1421	#if WIN32
		1422	signal (w->signum, sighandler);
		1423	#else
668	struct sigaction sa;	1424	struct sigaction sa;
669	sa.sa_handler = sighandler;	1425	sa.sa_handler = sighandler;
670	sigfillset (&sa.sa_mask);	1426	sigfillset (&sa.sa_mask);
671	sa.sa_flags = 0;	1427	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
672	sigaction (w->signum, &sa, 0);	1428	sigaction (w->signum, &sa, 0);
		1429	#endif
673	}	1430	}
674	}	1431	}
675		1432
676	void	1433	void
677	evsignal_stop (struct ev_signal *w)	1434	ev_signal_stop (EV_P_ struct ev_signal *w)
678	{	1435	{
		1436	ev_clear_pending (EV_A_ (W)w);
679	if (!ev_is_active (w))	1437	if (!ev_is_active (w))
680	return;	1438	return;
681		1439
682	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);	1440	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
683	ev_stop ((struct ev_watcher *)w);	1441	ev_stop (EV_A_ (W)w);
684		1442
685	if (!signals [w->signum - 1].head)	1443	if (!signals [w->signum - 1].head)
686	signal (w->signum, SIG_DFL);	1444	signal (w->signum, SIG_DFL);
687	}	1445	}
688		1446
689	void evidle_start (struct ev_idle *w)	1447	void
		1448	ev_child_start (EV_P_ struct ev_child *w)
690	{	1449	{
		1450	#if EV_MULTIPLICITY
		1451	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1452	#endif
691	if (ev_is_active (w))	1453	if (ev_is_active (w))
692	return;	1454	return;
693		1455
694	ev_start ((struct ev_watcher *)w, ++idlecnt);	1456	ev_start (EV_A_ (W)w, 1);
695	array_needsize (idles, idlemax, idlecnt, );	1457	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
696	idles [idlecnt - 1] = w;
697	}	1458	}
698		1459
699	void evidle_stop (struct ev_idle *w)	1460	void
		1461	ev_child_stop (EV_P_ struct ev_child *w)
700	{	1462	{
701	idles [w->active - 1] = idles [--idlecnt];	1463	ev_clear_pending (EV_A_ (W)w);
702	ev_stop ((struct ev_watcher *)w);
703	}
704
705	void evcheck_start (struct ev_check *w)
706	{
707	if (ev_is_active (w))	1464	if (ev_is_active (w))
708	return;	1465	return;
709		1466
710	ev_start ((struct ev_watcher *)w, ++checkcnt);	1467	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
711	array_needsize (checks, checkmax, checkcnt, );	1468	ev_stop (EV_A_ (W)w);
712	checks [checkcnt - 1] = w;
713	}
714
715	void evcheck_stop (struct ev_check *w)
716	{
717	checks [w->active - 1] = checks [--checkcnt];
718	ev_stop ((struct ev_watcher *)w);
719	}	1469	}
720		1470
721	/*****************************************************************************/	1471	/*****************************************************************************/
722	#if 1
723		1472
724	static void	1473	struct ev_once
725	sin_cb (struct ev_io *w, int revents)
726	{	1474	{
727	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
728	}
729
730	static void
731	ocb (struct ev_timer *w, int revents)
732	{
733	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
734	evtimer_stop (w);
735	evtimer_start (w);
736	}
737
738	static void
739	scb (struct ev_signal *w, int revents)
740	{
741	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
742	}
743
744	static void
745	gcb (struct ev_signal *w, int revents)
746	{
747	fprintf (stderr, "generic %x\n", revents);
748	}
749
750	int main (void)
751	{
752	struct ev_io sin;	1475	struct ev_io io;
753
754	ev_init (0);
755
756	evw_init (&sin, sin_cb, 55);
757	evio_set (&sin, 0, EV_READ);
758	evio_start (&sin);
759
760	struct ev_timer t[10000];
761
762	#if 0
763	int i;
764	for (i = 0; i < 10000; ++i)
765	{
766	struct ev_timer *w = t + i;
767	evw_init (w, ocb, i);
768	evtimer_set_abs (w, drand48 (), 0.99775533);
769	evtimer_start (w);
770	if (drand48 () < 0.5)
771	evtimer_stop (w);
772	}
773	#endif
774
775	struct ev_timer t1;	1476	struct ev_timer to;
776	evw_init (&t1, ocb, 0);	1477	void (cb)(int revents, void arg);
777	evtimer_set_abs (&t1, 5, 10);	1478	void *arg;
778	evtimer_start (&t1);	1479	};
779		1480
780	struct ev_signal sig;	1481	static void
781	evw_init (&sig, scb, 65535);	1482	once_cb (EV_P_ struct ev_once *once, int revents)
782	evsignal_set (&sig, SIGQUIT);	1483	{
783	evsignal_start (&sig);	1484	void (cb)(int revents, void arg) = once->cb;
		1485	void *arg = once->arg;
784		1486
785	struct ev_check cw;	1487	ev_io_stop (EV_A_ &once->io);
786	evw_init (&cw, gcb, 0);	1488	ev_timer_stop (EV_A_ &once->to);
787	evcheck_start (&cw);	1489	ev_free (once);
788		1490
789	struct ev_idle iw;	1491	cb (revents, arg);
790	evw_init (&iw, gcb, 0);
791	evidle_start (&iw);
792
793	ev_loop (0);
794
795	return 0;
796	}	1492	}
797		1493
798	#endif	1494	static void
		1495	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1496	{
		1497	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1498	}
799		1499
		1500	static void
		1501	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1502	{
		1503	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1504	}
800		1505
		1506	void
		1507	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1508	{
		1509	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
801		1510
		1511	if (!once)
		1512	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1513	else
		1514	{
		1515	once->cb = cb;
		1516	once->arg = arg;
802		1517
		1518	ev_watcher_init (&once->io, once_cb_io);
		1519	if (fd >= 0)
		1520	{
		1521	ev_io_set (&once->io, fd, events);
		1522	ev_io_start (EV_A_ &once->io);
		1523	}
		1524
		1525	ev_watcher_init (&once->to, once_cb_to);
		1526	if (timeout >= 0.)
		1527	{
		1528	ev_timer_set (&once->to, timeout, 0.);
		1529	ev_timer_start (EV_A_ &once->to);
		1530	}
		1531	}
		1532	}
		1533

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Comparing libev/ev.c (file contents): Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs. Revision 1.75 by root, Tue Nov 6 19:29:20 2007 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.75 by root, Tue Nov 6 19:29:20 2007 UTC