73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* $NetBSD: lock.h,v 1.3 2011/08/13 10:31:24 jmcneill Exp $ */
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/*-
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* Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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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 _ARCH_USERMODE_INCLUDE_LOCK_H
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#define _ARCH_USERMODE_INCLUDE_LOCK_H
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__inline static void
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__cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
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{
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*lockp = __SIMPLELOCK_UNLOCKED;
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}
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__inline static int
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__cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
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{
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if (*lockp == __SIMPLELOCK_LOCKED)
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return 0;
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*lockp = __SIMPLELOCK_LOCKED;
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return 1;
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}
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__inline static void
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__cpu_simple_lock(__cpu_simple_lock_t *lockp)
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{
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while (!__cpu_simple_lock_try(lockp))
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;
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}
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__inline static void
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__cpu_simple_unlock(__cpu_simple_lock_t *lockp)
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{
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*lockp = __SIMPLELOCK_UNLOCKED;
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}
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__inline static int
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__SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *lockp)
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{
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return *lockp == __SIMPLELOCK_LOCKED;
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}
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__inline static int
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__SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *lockp)
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{
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return *lockp == __SIMPLELOCK_UNLOCKED;
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}
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#endif /* !_ARCH_USERMODE_INCLUDE_LOCK_H */
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