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/*-------------------------------------------------------------------------
*
* buf.h
* Basic buffer manager data types.
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: buf.h,v 1.7 2000/01/26 05:58:32 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef BUF_H
#define BUF_H
#define InvalidBuffer (0)
#define UnknownBuffer (-99999)
typedef long Buffer;
/*
* BufferIsInvalid
* True iff the buffer is invalid.
*/
#define BufferIsInvalid(buffer) ((buffer) == InvalidBuffer)
/*
* BufferIsUnknown
* True iff the buffer is unknown.
*/
#define BufferIsUnknown(buffer) ((buffer) == UnknownBuffer)
/*
* BufferIsLocal
* True iff the buffer is local (not visible to other servers).
*/
#define BufferIsLocal(buffer) ((buffer) < 0)
/*
* If NO_BUFFERISVALID is defined, all error checking using BufferIsValid()
* are suppressed. Decision-making using BufferIsValid is not affected.
* This should be set only if one is sure there will be no errors.
* - plai 9/10/90
*/
#undef NO_BUFFERISVALID
#endif /* BUF_H */
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