src/include/access/subtrans.h

   1 /*
   2  * subtrans.h
   3  *
   4  * PostgreSQL subtransaction-log manager
   5  *
   6  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * src/include/access/subtrans.h
  10  */
  11 #ifndef SUBTRANS_H
  12 #define SUBTRANS_H
  13
  14 /* Number of SLRU buffers to use for subtrans */
  15 #define NUM_SUBTRANS_BUFFERS    32
  16
  17 extern void SubTransSetParent(TransactionId xid, TransactionId parent);
  18 extern TransactionId SubTransGetParent(TransactionId xid);
  19 extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
  20
  21 extern Size SUBTRANSShmemSize(void);
  22 extern void SUBTRANSShmemInit(void);
  23 extern void BootStrapSUBTRANS(void);
  24 extern void StartupSUBTRANS(TransactionId oldestActiveXID);
  25 extern void CheckPointSUBTRANS(void);
  26 extern void ExtendSUBTRANS(TransactionId newestXact);
  27 extern void TruncateSUBTRANS(TransactionId oldestXact);
  28
  29 #endif                                                  /* SUBTRANS_H */