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Nested transactions. There is still much left to do, especially on the

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performance front, but with feature freeze upon us I think it's time to
drive a stake in the ground and say that this will be in 7.5.

Alvaro Herrera, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2004-07-01 00:52:04 +00:00
parent 4c9aa572fa
commit 573a71a5da
74 changed files with 4516 additions and 1144 deletions
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35
src/include/access/subtrans.h Normal file
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/*
* subtrans.h
*
* PostgreSQL subtrans-log manager
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.1 2004/07/01 00:51:38 tgl Exp $
*/
#ifndef SUBTRANS_H
#define SUBTRANS_H
#include "access/xlog.h"
/* exported because lwlock.c needs it */
/* cannot be different from NUM_CLOG_BUFFERS without slru.c changes */
#define NUM_SUBTRANS_BUFFERS NUM_CLOG_BUFFERS
extern void SubTransSetParent(TransactionId xid, TransactionId parent);
extern TransactionId SubTransGetParent(TransactionId xid);
extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
extern bool SubTransXidsHaveCommonAncestor(TransactionId xid1, TransactionId xid2);
extern int SUBTRANSShmemSize(void);
extern void SUBTRANSShmemInit(void);
extern void BootStrapSUBTRANS(void);
extern void StartupSUBTRANS(void);
extern void ShutdownSUBTRANS(void);
extern void CheckPointSUBTRANS(void);
extern void ExtendSUBTRANS(TransactionId newestXact);
extern void TruncateSUBTRANS(TransactionId oldestXact);
extern void subtrans_zeropage_redo(int pageno);
#endif /* SUBTRANS_H */