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/*-------------------------------------------------------------------------
*
* backendid.h
* POSTGRES backend id communication definitions
*
*
* Portions Copyright (c) 1996-2024, 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
/*
* BackendId uniquely identifies an active backend or auxiliary process. It's
* assigned at backend startup after authentication. Note that a backend ID
* can be reused for a different backend immediately after a backend exits.
*
* Backend IDs are assigned starting from 1. For historical reasons, BackendId
* 0 is unused, but InvalidBackendId is defined as -1.
*/
typedef int BackendId;
#define InvalidBackendId (-1)
extern PGDLLIMPORT BackendId MyBackendId; /* backend id of this backend */
/* backend id of our parallel session leader, or InvalidBackendId if none */
extern PGDLLIMPORT BackendId ParallelLeaderBackendId;
/*
* 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() \
(ParallelLeaderBackendId == InvalidBackendId ? MyBackendId : ParallelLeaderBackendId)
#endif /* BACKENDID_H */
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