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Add new GUC reserved_connections.

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This provides a way to reserve connection slots for non-superusers.
The slots reserved via the new GUC are available only to users who
have the new predefined role pg_use_reserved_connections.
superuser_reserved_connections remains as a final reserve in case
reserved_connections has been exhausted.

Patch by Nathan Bossart. Reviewed by Tushar Ahuja and by me.

Discussion: http://postgr.es/m/20230119194601.GA4105788@nathanxps13
This commit is contained in:
Robert Haas
2023-01-20 15:36:36 -05:00
parent fe00fec1f5
commit 6e2775e4d4
10 changed files with 115 additions and 25 deletions
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2
src/include/storage/proc.h
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@@ -445,7 +445,7 @@ extern void InitAuxiliaryProcess(void);
extern void SetStartupBufferPinWaitBufId(int bufid);
extern int GetStartupBufferPinWaitBufId(void);
extern bool HaveNFreeProcs(int n);
extern bool HaveNFreeProcs(int n, int *nfree);
extern void ProcReleaseLocks(bool isCommit);
extern ProcWaitStatus ProcSleep(LOCALLOCK *locallock, LockMethod lockMethodTable);