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/*------------------------------------------------------------------------- * * standbydef.h * Frontend exposed definitions for hot standby mode. * * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/storage/standbydefs.h * *------------------------------------------------------------------------- */ #ifndef STANDBYDEFS_H #define STANDBYDEFS_H #include "access/xlogreader.h" #include "lib/stringinfo.h" #include "storage/lockdefs.h" #include "storage/sinval.h" /* Recovery handlers for the Standby Rmgr (RM_STANDBY_ID) */ extern void standby_redo(XLogReaderState *record); extern void standby_desc(StringInfo buf, XLogReaderState *record); extern const char *standby_identify(uint8 info); extern void standby_desc_invalidations(StringInfo buf, int nmsgs, SharedInvalidationMessage *msgs, Oid dbId, Oid tsId, bool relcacheInitFileInval); /* * XLOG message types */ #define XLOG_STANDBY_LOCK 0x00 #define XLOG_RUNNING_XACTS 0x10 #define XLOG_INVALIDATIONS 0x20 typedef struct xl_standby_locks { int nlocks; /* number of entries in locks array */ xl_standby_lock locks[FLEXIBLE_ARRAY_MEMBER]; } xl_standby_locks; /* * When we write running xact data to WAL, we use this structure. */ typedef struct xl_running_xacts { int xcnt; /* # of xact ids in xids[] */ int subxcnt; /* # of subxact ids in xids[] */ bool subxid_overflow; /* snapshot overflowed, subxids missing */ TransactionId nextXid; /* copy of ShmemVariableCache->nextXid */ TransactionId oldestRunningXid; /* *not* oldestXmin */ TransactionId latestCompletedXid; /* so we can set xmax */ TransactionId xids[FLEXIBLE_ARRAY_MEMBER]; } xl_running_xacts; /* * Invalidations for standby, currently only when transactions without an * assigned xid commit. */ typedef struct xl_invalidations { Oid dbId; /* MyDatabaseId */ Oid tsId; /* MyDatabaseTableSpace */ bool relcacheInitFileInval; /* invalidate relcache init files */ int nmsgs; /* number of shared inval msgs */ SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER]; } xl_invalidations; #define MinSizeOfInvalidations offsetof(xl_invalidations, msgs) #endif /* STANDBYDEFS_H */