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Implement LockBufferForCleanup(), which will allow concurrent VACUUM

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to wait until it's safe to remove tuples and compact free space in a
shared buffer page.  Miscellaneous small code cleanups in bufmgr, too.
This commit is contained in:
Tom Lane
2001-07-06 21:04:26 +00:00
parent 1e9e5defc2
commit 55432fedd2
11 changed files with 418 additions and 254 deletions
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31
src/backend/storage/ipc/sinval.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.34 2001/06/19 19:42:15 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.35 2001/07/06 21:04:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,7 +16,6 @@
#include <sys/types.h>
#include "storage/backendid.h"
#include "storage/proc.h"
#include "storage/sinval.h"
#include "storage/sinvaladt.h"
@@ -411,3 +410,31 @@ GetUndoRecPtr(void)
return (urec);
}
/*
* BackendIdGetProc - given a BackendId, find its PROC structure
*
* This is a trivial lookup in the ProcState array. We assume that the caller
* knows that the backend isn't going to go away, so we do not bother with
* locking.
*/
struct proc *
BackendIdGetProc(BackendId procId)
{
SISeg *segP = shmInvalBuffer;
if (procId > 0 && procId <= segP->lastBackend)
{
ProcState *stateP = &segP->procState[procId - 1];
SHMEM_OFFSET pOffset = stateP->procStruct;
if (pOffset != INVALID_OFFSET)
{
PROC *proc = (PROC *) MAKE_PTR(pOffset);
return proc;
}
}
return NULL;
}