75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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* Copyright (c) 1997, by Steve Passe
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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. The name of the developer may NOT be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_LOCK_H_
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#define _MACHINE_LOCK_H_
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/*
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* Simple spin lock.
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* It is an error to hold one of these locks while a process is sleeping.
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*/
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struct simplelock {
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volatile u_int lock_data;
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};
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/* functions in mp_machdep.c */
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void s_lock_init __P((struct simplelock *));
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void s_lock __P((struct simplelock *));
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int s_lock_try __P((struct simplelock *));
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void ss_lock __P((struct simplelock *));
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void ss_unlock __P((struct simplelock *));
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void s_lock_np __P((struct simplelock *));
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void s_unlock_np __P((struct simplelock *));
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/* inline simplelock functions */
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static __inline void
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s_unlock(struct simplelock *lkp)
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{
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alpha_mb();
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lkp->lock_data = 0;
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}
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#if !defined(SIMPLELOCK_DEBUG) && MAXCPU > 1
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/*
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* This set of defines turns on the real functions in i386/isa/apic_ipl.s.
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*/
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#define simple_lock_init(alp) s_lock_init(alp)
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#define simple_lock(alp) s_lock(alp)
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#define simple_lock_try(alp) s_lock_try(alp)
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#define simple_unlock(alp) s_unlock(alp)
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#endif /* !SIMPLELOCK_DEBUG && MAXCPU > 1 */
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#define COM_LOCK()
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#define COM_UNLOCK()
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#define COM_DISABLE_INTR() COM_LOCK()
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#define COM_ENABLE_INTR() COM_UNLOCK()
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#endif /* !_MACHINE_LOCK_H_ */
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