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0007490e09
to 'Size' (that is, size_t), and install overflow detection checks in it. This allows us to remove the former arbitrary restrictions on NBuffers etc. It won't make any difference in a 32-bit machine, but in a 64-bit machine you could theoretically have terabytes of shared buffers. (How efficiently we could manage 'em remains to be seen.) Similarly, num_temp_buffers, work_mem, and maintenance_work_mem can be set above 2Gb on a 64-bit machine. Original patch from Koichi Suzuki, additional work by moi.
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* multixact.h
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*
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* PostgreSQL multi-transaction-log manager
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.6 2005/08/20 23:26:29 tgl Exp $
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*/
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#ifndef MULTIXACT_H
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#define MULTIXACT_H
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#include "access/xlog.h"
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#define InvalidMultiXactId ((MultiXactId) 0)
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#define FirstMultiXactId ((MultiXactId) 1)
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#define MultiXactIdIsValid(multi) ((multi) != InvalidMultiXactId)
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/* ----------------
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* multixact-related XLOG entries
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* ----------------
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*/
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#define XLOG_MULTIXACT_ZERO_OFF_PAGE 0x00
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#define XLOG_MULTIXACT_ZERO_MEM_PAGE 0x10
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#define XLOG_MULTIXACT_CREATE_ID 0x20
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typedef struct xl_multixact_create
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{
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MultiXactId mid; /* new MultiXact's ID */
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MultiXactOffset moff; /* its starting offset in members file */
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int32 nxids; /* number of member XIDs */
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TransactionId xids[1]; /* VARIABLE LENGTH ARRAY */
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} xl_multixact_create;
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#define MinSizeOfMultiXactCreate offsetof(xl_multixact_create, xids)
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extern MultiXactId MultiXactIdCreate(TransactionId xid1, TransactionId xid2);
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extern MultiXactId MultiXactIdExpand(MultiXactId multi, TransactionId xid);
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extern bool MultiXactIdIsRunning(MultiXactId multi);
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extern void MultiXactIdWait(MultiXactId multi);
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extern bool ConditionalMultiXactIdWait(MultiXactId multi);
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extern void MultiXactIdSetOldestMember(void);
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extern int GetMultiXactIdMembers(MultiXactId multi, TransactionId **xids);
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extern void AtEOXact_MultiXact(void);
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extern Size MultiXactShmemSize(void);
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extern void MultiXactShmemInit(void);
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extern void BootStrapMultiXact(void);
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extern void StartupMultiXact(void);
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extern void ShutdownMultiXact(void);
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extern void MultiXactGetCheckptMulti(bool is_shutdown,
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MultiXactId *nextMulti,
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MultiXactOffset *nextMultiOffset);
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extern void CheckPointMultiXact(void);
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extern void MultiXactSetNextMXact(MultiXactId nextMulti,
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MultiXactOffset nextMultiOffset);
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extern void MultiXactAdvanceNextMXact(MultiXactId minMulti,
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MultiXactOffset minMultiOffset);
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extern void multixact_redo(XLogRecPtr lsn, XLogRecord *record);
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extern void multixact_desc(char *buf, uint8 xl_info, char *rec);
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#endif /* MULTIXACT_H */
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