spin.h
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上传日期:2007-01-07
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- /*-------------------------------------------------------------------------
- *
- * spin.h
- * synchronization routines
- *
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- * $Id: spin.h,v 1.8.2.1 1999/07/30 17:07:18 scrappy Exp $
- *
- *-------------------------------------------------------------------------
- */
- #ifndef SPIN_H
- #define SPIN_H
- #include "storage/ipc.h"
- /*
- * two implementations of spin locks
- *
- * sequent, sparc, sun3: real spin locks. uses a TAS instruction; see
- * src/storage/ipc/s_lock.c for details.
- *
- * default: fake spin locks using semaphores. see spin.c
- *
- */
- typedef int SPINLOCK;
- extern bool CreateSpinlocks(IPCKey key);
- extern bool InitSpinLocks(int init, IPCKey key);
- extern void SpinAcquire(SPINLOCK lockid);
- extern void SpinRelease(SPINLOCK lockid);
- #endif /* SPIN_H */