source: rtems-libbsd/freebsd/sys/sys/_sx.h @ cc7a8d8

55-freebsd-126-freebsd-12
Last change on this file since cc7a8d8 was cc7a8d8, checked in by Sebastian Huber <sebastian.huber@…>, on 11/15/17 at 10:49:09

SX(9): Implement with reader/writer lock

  • Property mode set to 100644
File size: 1.8 KB
Line 
1/*-
2 * Copyright (c) 2007 Attilio Rao <attilio@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(s), this list of conditions and the following disclaimer as
10 *    the first lines of this file unmodified other than the possible
11 *    addition of one or more copyright notices.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice(s), this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
26 * DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef _SYS__SX_H_
32#define _SYS__SX_H_
33#ifdef __rtems__
34#include <machine/rtems-bsd-rwlock.h>
35#endif /* __rtems__ */
36
37/*
38 * Shared/exclusive lock main structure definition.
39 */
40struct sx {
41        struct lock_object      lock_object;
42#ifndef __rtems__
43        volatile uintptr_t      sx_lock;
44#else /* __rtems__ */
45        rtems_bsd_rwlock        rwlock;
46#endif /* __rtems__ */
47};
48
49#endif  /* !_SYS__SX_H_ */
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