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024c521117
Now that BackendId was just another index into the proc array, it was redundant with the 0-based proc numbers used in other places. Replace all usage of backend IDs with proc numbers. The only place where the term "backend id" remains is in a few pgstat functions that expose backend IDs at the SQL level. Those IDs are now in fact 0-based ProcNumbers too, but the documentation still calls them "backend ids". That term still seems appropriate to describe what the numbers are, so I let it be. One user-visible effect is that pg_temp_0 is now a valid temp schema name, for backend with ProcNumber 0. Reviewed-by: Andres Freund Discussion: https://www.postgresql.org/message-id/8171f1aa-496f-46a6-afc3-c46fe7a9b407@iki.fi
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* procnumber.h
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* definition of process number
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*
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/storage/procnumber.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PROCNUMBER_H
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#define PROCNUMBER_H
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/*
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* ProcNumber uniquely identifies an active backend or auxiliary process.
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* It's assigned at backend startup after authentication, when the process
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* adds itself to the proc array. It is an index into the proc array,
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* starting from 0. Note that a ProcNumber can be reused for a different
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* backend immediately after a backend exits.
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*/
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typedef int ProcNumber;
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#define INVALID_PROC_NUMBER (-1)
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/*
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* Proc number of this backend (same as GetNumberFromPGProc(MyProc))
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*/
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extern PGDLLIMPORT ProcNumber MyProcNumber;
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/* proc number of our parallel session leader, or INVALID_PROC_NUMBER if none */
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extern PGDLLIMPORT ProcNumber ParallelLeaderProcNumber;
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/*
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* The ProcNumber to use for our session's temp relations is normally our own,
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* but parallel workers should use their leader's proc number.
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*/
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#define ProcNumberForTempRelations() \
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(ParallelLeaderProcNumber == INVALID_PROC_NUMBER ? MyProcNumber : ParallelLeaderProcNumber)
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#endif /* PROCNUMBER_H */
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