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Replace BackendIds with 0-based ProcNumbers

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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
This commit is contained in:
Heikki Linnakangas
2024-03-03 19:38:22 +02:00
parent ab355e3a88
commit 024c521117
71 changed files with 571 additions and 579 deletions
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2
src/include/access/twophase.h
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@@ -37,7 +37,7 @@ extern void PostPrepare_Twophase(void);
extern TransactionId TwoPhaseGetXidByVirtualXID(VirtualTransactionId vxid,
bool *have_more);
extern PGPROC *TwoPhaseGetDummyProc(TransactionId xid, bool lock_held);
extern BackendId TwoPhaseGetDummyBackendId(TransactionId xid, bool lock_held);
extern int TwoPhaseGetDummyProcNumber(TransactionId xid, bool lock_held);
extern GlobalTransaction MarkAsPreparing(TransactionId xid, const char *gid,
TimestampTz prepared_at,