korsygfhrtzangaiide

/* * multixact.h * * PostgreSQL multi-transaction-log manager * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/access/multixact.h */ #ifndef MULTIXACT_H #define MULTIXACT_H #include "access/xlog.h" #define InvalidMultiXactId ((MultiXactId) 0) #define FirstMultiXactId ((MultiXactId) 1) #define MaxMultiXactId ((MultiXactId) 0xFFFFFFFF) #define MultiXactIdIsValid(multi) ((multi) != InvalidMultiXactId) /* Number of SLRU buffers to use for multixact */ #define NUM_MXACTOFFSET_BUFFERS 8 #define NUM_MXACTMEMBER_BUFFERS 16 /* ---------------- * 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); extern bool MultiXactIdIsCurrent(MultiXactId multi); extern void MultiXactIdWait(MultiXactId multi); extern bool ConditionalMultiXactIdWait(MultiXactId multi); extern void MultiXactIdSetOldestMember(void); extern int GetMultiXactIdMembers(MultiXactId multi, TransactionId **xids); extern void AtEOXact_MultiXact(void); extern void AtPrepare_MultiXact(void); extern void PostPrepare_MultiXact(TransactionId xid); extern Size MultiXactShmemSize(void); extern void MultiXactShmemInit(void); extern void BootStrapMultiXact(void); extern void StartupMultiXact(void); extern void TrimMultiXact(void); extern void ShutdownMultiXact(void); extern void MultiXactGetCheckptMulti(bool is_shutdown, MultiXactId *nextMulti, MultiXactOffset *nextMultiOffset); extern void CheckPointMultiXact(void); extern void MultiXactSetNextMXact(MultiXactId nextMulti, MultiXactOffset nextMultiOffset); extern void MultiXactAdvanceNextMXact(MultiXactId minMulti, MultiXactOffset minMultiOffset); extern void multixact_twophase_recover(TransactionId xid, uint16 info, void *recdata, uint32 len); extern void multixact_twophase_postcommit(TransactionId xid, uint16 info, void *recdata, uint32 len); extern void multixact_twophase_postabort(TransactionId xid, uint16 info, void *recdata, uint32 len); extern void multixact_redo(XLogRecPtr lsn, XLogRecord *record); extern void multixact_desc(StringInfo buf, uint8 xl_info, char *rec); #endif /* MULTIXACT_H */