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/*-------------------------------------------------------------------------
*
* spin.h
* synchronization routines
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: spin.h,v 1.14 2001/01/24 19:43:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SPIN_H
#define SPIN_H
#include "storage/ipc.h"
/*
* two implementations of spin locks
*
* Where TAS instruction is available: real spin locks.
* See src/storage/ipc/s_lock.c for details.
*
* Otherwise: fake spin locks using semaphores. see spin.c
*/
typedef int SPINLOCK;
#ifdef LOCK_DEBUG
extern bool Trace_spinlocks;
#endif
extern int SLockShmemSize(void);
extern void CreateSpinlocks(PGShmemHeader *seghdr);
extern void SpinAcquire(SPINLOCK lockid);
extern void SpinRelease(SPINLOCK lockid);
#endif /* SPIN_H */
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