greenplumn pg_lsn 代码
文件路径：/src/include/utils/pg_lsn.h
/*-------------------------------------------------------------------------
*
* pg_lsn.h
* Declarations for operations on log sequence numbers (LSNs) of
* PostgreSQL.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/pg_lsn.h
*
*-------------------------------------------------------------------------
*/
#ifndef PG_LSN_H
#define PG_LSN_H
#include "fmgr.h"
#include "access/xlogdefs.h"
#define DatumGetLSN(X) ((XLogRecPtr) DatumGetInt64(X))
#define LSNGetDatum(X) (Int64GetDatum((int64) (X)))
#define PG_GETARG_LSN(n) DatumGetLSN(PG_GETARG_DATUM(n))
#define PG_RETURN_LSN(x) return LSNGetDatum(x)
extern XLogRecPtr pg_lsn_in_internal(const char *str, bool *have_error);
#endif /* PG_LSN_H */