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/*-------------------------------------------------------------------------
*
* portal.h
* POSTGRES portal definitions.
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: portal.h,v 1.24 2000/06/28 03:33:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/*
* Note:
* A portal is an abstraction which represents the execution state of
* a running query (or a fixed sequence of queries).
*
* Note:
* now that PQ calls can be made from within a backend, a portal
* may also be used to keep track of the tuples resulting
* from the execution of a query. In this case, entryIndex
*/
#ifndef PORTAL_H
#define PORTAL_H
#include "executor/execdesc.h"
#include "nodes/memnodes.h"
typedef struct PortalD *Portal;
typedef struct PortalD
{
char *name; /* Portal's name */
MemoryContext heap; /* subsidiary memory */
QueryDesc *queryDesc; /* Info about query associated with portal */
TupleDesc attinfo;
EState *state;
void (*cleanup) (Portal); /* Cleanup routine (optional) */
} PortalD;
/*
* PortalIsValid
* True iff portal is valid.
*/
#define PortalIsValid(p) PointerIsValid(p)
extern void EnablePortalManager(void);
extern void AtEOXact_portals(void);
extern Portal CreatePortal(char *name);
extern void PortalDrop(Portal *portalP);
extern Portal GetPortalByName(char *name);
extern void PortalSetQuery(Portal portal, QueryDesc *queryDesc,
TupleDesc attinfo, EState *state,
void (*cleanup) (Portal portal));
extern QueryDesc *PortalGetQueryDesc(Portal portal);
extern EState *PortalGetState(Portal portal);
extern MemoryContext PortalGetHeapMemory(Portal portal);
/* estimate of the maximum number of open portals a user would have,
* used in initially sizing the PortalHashTable in EnablePortalManager()
*/
#define PORTALS_PER_USER 10
#endif /* PORTAL_H */
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