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/* $OpenBSD: mutex.h,v 1.3 2009/12/29 15:01:59 jsing Exp $ */
/*
* Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MACHINE_MUTEX_H_
#define _MACHINE_MUTEX_H_
#define MUTEX_LOCKED 0
#define MUTEX_UNLOCKED 1
/* Note: mtx_lock must be 16-byte aligned. */
struct mutex {
volatile int mtx_lock;
int mtx_wantipl;
int mtx_oldipl;
void *mtx_owner;
} __attribute__ ((__aligned__(16)));
void mtx_init(struct mutex *, int);
#define MUTEX_INITIALIZER(ipl) { MUTEX_UNLOCKED, (ipl), 0, NULL }
#ifdef DIAGNOSTIC
#define MUTEX_ASSERT_LOCKED(mtx) do { \
if ((mtx)->mtx_lock != MUTEX_LOCKED) \
panic("mutex %p not held in %s", (mtx), __func__); \
} while (0)
#define MUTEX_ASSERT_UNLOCKED(mtx) do { \
if ((mtx)->mtx_lock != MUTEX_UNLOCKED) \
panic("mutex %p held in %s", (mtx), __func__); \
} while (0)
#else
#define MUTEX_ASSERT_LOCKED(mtx) do { } while (0)
#define MUTEX_ASSERT_UNLOCKED(mtx) do { } while (0)
#endif
#define MUTEX_OLDIPL(mtx) (mtx)->mtx_oldipl
#endif
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