database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-24 01:29:19 +03:00
Code Activity

Change WAL-logging scheme for multixacts to be more like regular

Browse Source 
transaction IDs, rather than like subtrans; in particular, the information
now survives a database restart.  Per previous discussion, this is
essential for PITR log shipping and for 2PC.
This commit is contained in:
Tom Lane
2005-06-08 15:50:28 +00:00
parent 593badd30b
commit f5b2f60bd1
12 changed files with 560 additions and 274 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
src/include/access/multixact.h
View File

@@ -6,16 +6,38 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.2 2005/05/03 19:42:41 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.3 2005/06/08 15:50:28 tgl Exp $
*/
#ifndef MULTIXACT_H
#define MULTIXACT_H
#include "access/xlog.h"
#define InvalidMultiXactId ((MultiXactId) 0)
#define FirstMultiXactId ((MultiXactId) 1)
#define MultiXactIdIsValid(multi) ((multi) != InvalidMultiXactId)
/* ----------------
* multixact-related XLOG entries
* ----------------
*/
#define XLOG_MULTIXACT_ZERO_OFF_PAGE 0x00
#define XLOG_MULTIXACT_ZERO_MEM_PAGE 0x10
#define XLOG_MULTIXACT_CREATE_ID 0x20
typedef struct xl_multixact_create
{
MultiXactId mid; /* new MultiXact's ID */
MultiXactOffset moff; /* its starting offset in members file */
int32 nxids; /* number of member XIDs */
TransactionId xids[1]; /* VARIABLE LENGTH ARRAY */
} xl_multixact_create;
#define MinSizeOfMultiXactCreate offsetof(xl_multixact_create, xids)
extern MultiXactId MultiXactIdCreate(TransactionId xid1, TransactionId xid2);
extern MultiXactId MultiXactIdExpand(MultiXactId multi, TransactionId xid);
extern bool MultiXactIdIsRunning(MultiXactId multi);
@@ -29,9 +51,16 @@ extern void MultiXactShmemInit(void);
extern void BootStrapMultiXact(void);
extern void StartupMultiXact(void);
extern void ShutdownMultiXact(void);
extern MultiXactId MultiXactGetCheckptMulti(bool is_shutdown);
extern void MultiXactGetCheckptMulti(bool is_shutdown,
MultiXactId *nextMulti,
MultiXactOffset *nextMultiOffset);
extern void CheckPointMultiXact(void);
extern void MultiXactSetNextMXact(MultiXactId nextMulti);
extern void MultiXactAdvanceNextMXact(MultiXactId minMulti);
extern void MultiXactSetNextMXact(MultiXactId nextMulti,
MultiXactOffset nextMultiOffset);
extern void MultiXactAdvanceNextMXact(MultiXactId minMulti,
MultiXactOffset minMultiOffset);
extern void multixact_redo(XLogRecPtr lsn, XLogRecord *record);
extern void multixact_desc(char *buf, uint8 xl_info, char *rec);
#endif /* MULTIXACT_H */