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/*-------------------------------------------------------------------------
*
* logtape.h
* Management of "logical tapes" within temporary files.
*
* See logtape.c for explanations.
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/logtape.h,v 1.17 2008/01/01 19:45:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LOGTAPE_H
#define LOGTAPE_H
/* LogicalTapeSet is an opaque type whose details are not known outside logtape.c. */
typedef struct LogicalTapeSet LogicalTapeSet;
/*
* prototypes for functions in logtape.c
*/
extern LogicalTapeSet *LogicalTapeSetCreate(int ntapes);
extern void LogicalTapeSetClose(LogicalTapeSet *lts);
extern void LogicalTapeSetForgetFreeSpace(LogicalTapeSet *lts);
extern size_t LogicalTapeRead(LogicalTapeSet *lts, int tapenum,
void *ptr, size_t size);
extern void LogicalTapeWrite(LogicalTapeSet *lts, int tapenum,
void *ptr, size_t size);
extern void LogicalTapeRewind(LogicalTapeSet *lts, int tapenum, bool forWrite);
extern void LogicalTapeFreeze(LogicalTapeSet *lts, int tapenum);
extern bool LogicalTapeBackspace(LogicalTapeSet *lts, int tapenum,
size_t size);
extern bool LogicalTapeSeek(LogicalTapeSet *lts, int tapenum,
long blocknum, int offset);
extern void LogicalTapeTell(LogicalTapeSet *lts, int tapenum,
long *blocknum, int *offset);
extern long LogicalTapeSetBlocks(LogicalTapeSet *lts);
#endif /* LOGTAPE_H */
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