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While changing Cygwin Python to build its core as a DLL (like Win32

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Python) to support shared extension modules, I have learned that Guido
prefers the style of the attached patch to solve the above problem.
I feel that this solution is particularly appropriate in this case
because the following:

    PglargeType
    PgType
    PgQueryType

are already being handled in the way that I am proposing for PgSourceType.

Jason Tishler
This commit is contained in:
Bruce Momjian
2001-05-25 15:34:50 +00:00
parent 3f7c542a60
commit dffb673692
10 changed files with 210 additions and 20 deletions
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46
src/backend/access/transam/varsup.c
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@@ -6,7 +6,7 @@
* Copyright (c) 2000, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.38 2001/03/22 03:59:17 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/varsup.c,v 1.39 2001/05/25 15:34:49 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,7 +16,10 @@
#include "access/transam.h"
#include "access/xlog.h"
#include "storage/proc.h"
#include "storage/sinval.h"
#include "storage/sinvaladt.h"
extern SISeg *shmInvalBuffer;
/* Number of XIDs and OIDs to prefetch (preallocate) per XLOG write */
#define VAR_XID_PREFETCH 1024
@@ -143,3 +146,44 @@ CheckMaxObjectId(Oid assigned_oid)
SpinRelease(OidGenLockId);
}
/*
* GetMinBackendOid -- returns lowest oid stored on startup of
* each backend.
*/
Oid
GetMinStartupOid(void)
{
SISeg *segP = shmInvalBuffer;
ProcState *stateP = segP->procState;
int index;
Oid min_oid;
/* prime with current oid, no need for lock */
min_oid = ShmemVariableCache->nextOid;
SpinAcquire(SInvalLock);
for (index = 0; index < segP->lastBackend; index++)
{
SHMEM_OFFSET pOffset = stateP[index].procStruct;
if (pOffset != INVALID_OFFSET)
{
PROC *proc = (PROC *) MAKE_PTR(pOffset);
Oid proc_oid;
proc_oid = proc->startOid; /* we don't use spin-locking in
* AbortTransaction() ! */
if (proc == MyProc || proc_oid <= BootstrapObjectIdData)
continue;
if (proc_oid < min_oid)
min_oid = proc_oid;
}
}
SpinRelease(SInvalLock);
return min_oid;
}