FreeBSD/Linux Kernel Cross Reference
sys/sys/condvar.h
1 /*-
2 * Copyright (c) 2000 Jake Burkholder <jake@freebsd.org>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/5.0/sys/sys/condvar.h 99072 2002-06-29 17:26:22Z julian $
27 */
28
29 #ifndef _SYS_CONDVAR_H_
30 #define _SYS_CONDVAR_H_
31
32 #ifndef LOCORE
33 #include <sys/queue.h>
34
35 struct mtx;
36 struct thread;
37
38 TAILQ_HEAD(cv_waitq, thread);
39
40 /*
41 * Condition variable.
42 */
43 struct cv {
44 struct cv_waitq cv_waitq; /* Queue of condition waiters. */
45 struct mtx *cv_mtx; /*
46 * Mutex passed in by cv_*wait*(),
47 * currently only used for INVARIANTS.
48 */
49 const char *cv_description;
50 };
51
52 #ifdef _KERNEL
53 void cv_init(struct cv *cvp, const char *desc);
54 void cv_destroy(struct cv *cvp);
55
56 void cv_wait(struct cv *cvp, struct mtx *mp);
57 int cv_wait_sig(struct cv *cvp, struct mtx *mp);
58 int cv_timedwait(struct cv *cvp, struct mtx *mp, int timo);
59 int cv_timedwait_sig(struct cv *cvp, struct mtx *mp, int timo);
60
61 void cv_signal(struct cv *cvp);
62 void cv_broadcast(struct cv *cvp);
63
64 void cv_waitq_remove(struct thread *td);
65 void cv_abort(struct thread *td);
66
67 #define cv_waitq_empty(cvp) (TAILQ_EMPTY(&(cvp)->cv_waitq))
68 #define cv_wmesg(cvp) ((cvp)->cv_description)
69
70 #endif /* _KERNEL */
71 #endif /* !LOCORE */
72 #endif /* _SYS_CONDVAR_H_ */
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