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/*-------------------------------------------------------------------------
*
* session.h
* Encapsulation of user session.
*
* Copyright (c) 2017-2023, PostgreSQL Global Development Group
*
* src/include/access/session.h
*
*-------------------------------------------------------------------------
*/
#ifndef SESSION_H
#define SESSION_H
#include "lib/dshash.h"
/* Avoid including typcache.h */
struct SharedRecordTypmodRegistry;
/*
* A struct encapsulating some elements of a user's session. For now this
* manages state that applies to parallel query, but in principle it could
* include other things that are currently global variables.
*/
typedef struct Session
{
dsm_segment *segment; /* The session-scoped DSM segment. */
dsa_area *area; /* The session-scoped DSA area. */
/* State managed by typcache.c. */
struct SharedRecordTypmodRegistry *shared_typmod_registry;
dshash_table *shared_record_table;
dshash_table *shared_typmod_table;
} Session;
extern void InitializeSession(void);
extern dsm_handle GetSessionDsmHandle(void);
extern void AttachSession(dsm_handle handle);
extern void DetachSession(void);
/* The current session, or NULL for none. */
extern PGDLLIMPORT Session *CurrentSession;
#endif /* SESSION_H */
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