greenplumn subtrans 源码
greenplumn subtrans 代码
文件路径：/src/include/access/subtrans.h
/*
* subtrans.h
*
* PostgreSQL subtransaction-log manager
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/subtrans.h
*/
#ifndef SUBTRANS_H
#define SUBTRANS_H
/* Number of SLRU buffers to use for subtrans */
#define NUM_SUBTRANS_BUFFERS 32
typedef struct SubTransData
{
TransactionId parent;
TransactionId topMostParent;
} SubTransData;
extern void SubTransSetParent(TransactionId xid, TransactionId parent);
extern TransactionId SubTransGetParent(TransactionId xid);
extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
extern Size SUBTRANSShmemSize(void);
extern void SUBTRANSShmemInit(void);
extern void BootStrapSUBTRANS(void);
extern void StartupSUBTRANS(TransactionId oldestActiveXID);
extern void ShutdownSUBTRANS(void);
extern void CheckPointSUBTRANS(void);
extern void ExtendSUBTRANS(TransactionId newestXact);
extern void TruncateSUBTRANS(TransactionId oldestXact);
#endif /* SUBTRANS_H */
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