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freebsd/sys/i386/include/mutex.h
John Baldwin e6c838590e GC #if 0'd assembly mutex micro operations. If someone wants to bring
these back later then can get them from the attic.  Also, GC, some stale
macros to acquire and release sleep mutexes in assembly.
2002-03-28 15:14:23 +00:00

76 lines
2.6 KiB
C

/*-
* Copyright (c) 1997 Berkeley Software Design, Inc. 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Berkeley Software Design Inc's name may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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.
*
* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
* $FreeBSD$
*/
#ifndef _MACHINE_MUTEX_H_
#define _MACHINE_MUTEX_H_
#ifndef LOCORE
#ifdef _KERNEL
/* Global locks */
extern struct mtx clock_lock;
#endif /* _KERNEL */
#else /* !LOCORE */
/*
* Simple assembly macros to get and release mutexes.
*
* Note: All of these macros accept a "flags" argument and are analoguous
* to the mtx_lock_flags and mtx_unlock_flags general macros. If one
* desires to not pass a flag, the value 0 may be passed as second
* argument.
*
* XXX: We only have MTX_LOCK_SPIN and MTX_UNLOCK_SPIN for now, since that's
* all we use right now. We should add MTX_LOCK and MTX_UNLOCK (for sleep
* locks) in the near future, however.
*/
#define MTX_LOCK_SPIN(lck, flags) \
pushl $0 ; \
pushl $0 ; \
pushl $flags ; \
pushl $lck ; \
call _mtx_lock_spin_flags ; \
addl $0x10, %esp ; \
#define MTX_UNLOCK_SPIN(lck) \
pushl $0 ; \
pushl $0 ; \
pushl $0 ; \
pushl $lck ; \
call _mtx_unlock_spin_flags ; \
addl $0x10, %esp ; \
#endif /* !LOCORE */
#endif /* __MACHINE_MUTEX_H */