src/include/storage/sinvaladt.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * sinvaladt.h
   4  *        POSTGRES shared cache invalidation data manager.
   5  *
   6  * The shared cache invalidation manager is responsible for transmitting
   7  * invalidation messages between backends.  Any message sent by any backend
   8  * must be delivered to all already-running backends before it can be
   9  * forgotten.  (If we run out of space, we instead deliver a "RESET"
  10  * message to backends that have fallen too far behind.)
  11  *
  12  * The struct type SharedInvalidationMessage, defining the contents of
  13  * a single message, is defined in sinval.h.
  14  *
  15  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
  16  * Portions Copyright (c) 1994, Regents of the University of California
  17  *
  18  * src/include/storage/sinvaladt.h
  19  *
  20  *-------------------------------------------------------------------------
  21  */
  22 #ifndef SINVALADT_H
  23 #define SINVALADT_H
  24
  25 #include "storage/lock.h"
  26 #include "storage/sinval.h"
  27
  28 /*
  29  * prototypes for functions in sinvaladt.c
  30  */
  31 extern Size SInvalShmemSize(void);
  32 extern void CreateSharedInvalidationState(void);
  33 extern void SharedInvalBackendInit(bool sendOnly);
  34 extern PGPROC *BackendIdGetProc(int backendID);
  35 extern void BackendIdGetTransactionIds(int backendID, TransactionId *xid, TransactionId *xmin);
  36
  37 extern void SIInsertDataEntries(const SharedInvalidationMessage *data, int n);
  38 extern int      SIGetDataEntries(SharedInvalidationMessage *data, int datasize);
  39 extern void SICleanupQueue(bool callerHasWriteLock, int minFree);
  40
  41 extern LocalTransactionId GetNextLocalTransactionId(void);
  42
  43 #endif                                                  /* SINVALADT_H */