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