74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* $NetBSD: mutex.h,v 1.7 2008/04/28 20:23:26 martin Exp $ */
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/*-
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* Copyright (c) 2002, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe and Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _M68K_MUTEX_H_
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#define _M68K_MUTEX_H_
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#ifndef __MUTEX_PRIVATE
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struct kmutex {
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uintptr_t mtx_pad1;
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};
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#else /* __MUTEX_PRIVATE */
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#include <machine/lock.h>
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struct kmutex {
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union {
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/* Adaptive mutex */
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volatile uintptr_t mtxu_owner; /* 0-3 */
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struct {
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ipl_cookie_t mtxs_ipl; /* 0-1 */
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__cpu_simple_lock_t mtxs_lock; /* 2 */
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uint8_t mtxs_unused; /* 3 */
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} s;
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} u;
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};
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#define mtx_owner u.mtxu_owner
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#define mtx_ipl u.s.mtxs_ipl
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#define mtx_lock u.s.mtxs_lock
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#define __HAVE_SIMPLE_MUTEXES 1
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#define __HAVE_MUTEX_STUBS 1
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#define MUTEX_RECEIVE(mtx) mb_read()
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#define MUTEX_GIVE(mtx) mb_memory()
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#define MUTEX_CAS(p, o, n) (atomic_cas_uint((p), (o), (n)) == (o))
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#endif /* __MUTEX_PRIVATE */
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#endif /* _M68K_MUTEX_H_ */
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