sinvaladt.h

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/*-------------------------------------------------------------------------
 *
 * sinvaladt.h
 *    POSTGRES shared cache invalidation data manager.
 *
 * The shared cache invalidation manager is responsible for transmitting
 * invalidation messages between backends.  Any message sent by any backend
 * must be delivered to all already-running backends before it can be
 * forgotten.  (If we run out of space, we instead deliver a "RESET"
 * message to backends that have fallen too far behind.)
 *
 * The struct type SharedInvalidationMessage, defining the contents of
 * a single message, is defined in sinval.h.
 *
 * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/sinvaladt.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SINVALADT_H
#define SINVALADT_H
 
#include "storage/lock.h"
#include "storage/sinval.h"
 
/*
 * prototypes for functions in sinvaladt.c
 */
extern Size SInvalShmemSize(void);
extern void CreateSharedInvalidationState(void);
extern void SharedInvalBackendInit(bool sendOnly);
extern PGPROC *BackendIdGetProc(int backendID);
extern void BackendIdGetTransactionIds(int backendID, TransactionId *xid,
                                       TransactionId *xmin, int *nsubxid,
                                       bool *overflowed);
 
extern void SIInsertDataEntries(const SharedInvalidationMessage *data, int n);
extern int  SIGetDataEntries(SharedInvalidationMessage *data, int datasize);
extern void SICleanupQueue(bool callerHasWriteLock, int minFree);
 
extern LocalTransactionId GetNextLocalTransactionId(void);
 
#endif                          /* SINVALADT_H */