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/*-------------------------------------------------------------------------
*
* backendid.h
* POSTGRES backend id communication definitions
*
*
* Portions Copyright (c) 2012-2014, TransLattice, Inc.
* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/backendid.h
*
*-------------------------------------------------------------------------
*/
#ifndef BACKENDID_H
#define BACKENDID_H
/* ----------------
* -cim 8/17/90
* ----------------
*/
typedef int BackendId; /* unique currently active backend identifier */
#define InvalidBackendId (-1)
extern PGDLLIMPORT BackendId MyBackendId; /* backend id of this backend */
#ifdef XCP
/*
* Two next variables make up distributed session id. Actual distributed
* session id is a string, which includes coordinator node name, but
* it is better to use Oid to store and compare with distributed session ids
* of other backends under the same postmaster.
*/
extern PGDLLIMPORT Oid MyCoordId;
extern PGDLLIMPORT char MyCoordName[NAMEDATALEN];
extern PGDLLIMPORT int MyCoordPid;
extern PGDLLIMPORT LocalTransactionId MyCoordLxid;
/* BackendId of the first backend of the distributed session on the node */
extern PGDLLIMPORT BackendId MyFirstBackendId;
#endif
/* backend id of our parallel session leader, or InvalidBackendId if none */
extern PGDLLIMPORT BackendId ParallelMasterBackendId;
/*
* The BackendId to use for our session's temp relations is normally our own,
* but parallel workers should use their leader's ID.
*/
#define BackendIdForTempRelations() \
(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
#endif /* BACKENDID_H */
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