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39 lines
910 B
C
39 lines
910 B
C
/*-------------------------------------------------------------------------
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*
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* spin.h--
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* synchronization routines
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: spin.h,v 1.2 1996/11/05 06:11:08 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SPIN_H
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#define SPIN_H
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#include <storage/ipc.h>
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/*
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* two implementations of spin locks
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*
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* sequent, sparc, sun3: real spin locks. uses a TAS instruction; see
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* src/storage/ipc/s_lock.c for details.
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*
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* default: fake spin locks using semaphores. see spin.c
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*
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*/
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typedef int SPINLOCK;
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extern bool CreateSpinlocks(IPCKey key);
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extern bool AttachSpinLocks(IPCKey key);
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extern bool InitSpinLocks(int init, IPCKey key);
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extern void SpinAcquire(SPINLOCK lock);
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extern void SpinRelease(SPINLOCK lock);
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extern bool SpinIsLocked(SPINLOCK lock);
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#endif /* SPIN_H */
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