2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 * promote products derived from this software without specific prior
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 * from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
32 #ifndef _MACHINE_MUTEX_H_
33 #define _MACHINE_MUTEX_H_
38 * Simple assembly macros to get and release mutexes.
40 * Note: All of these macros accept a "flags" argument and are analoguous
41 * to the mtx_lock_flags and mtx_unlock_flags general macros. If one
42 * desires to not pass a flag, the value 0 may be passed as second
45 * XXX: We only have MTX_LOCK_SPIN and MTX_UNLOCK_SPIN for now, since that's
46 * all we use right now. We should add MTX_LOCK and MTX_UNLOCK (for sleep
47 * locks) in the near future, however.
49 #define MTX_LOCK_SPIN(lck, flags) \
54 call _mtx_lock_spin_flags ; \
57 #define MTX_UNLOCK_SPIN(lck) \
62 call _mtx_unlock_spin_flags ; \
66 #endif /* __MACHINE_MUTEX_H */