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Invent ResourceOwner mechanism as per my recent proposal, and use it to

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keep track of portal-related resources separately from transaction-related
resources.  This allows cursors to work in a somewhat sane fashion with
nested transactions.  For now, cursor behavior is non-subtransactional,
that is a cursor's state does not roll back if you abort a subtransaction
that fetched from the cursor.  We might want to change that later.
This commit is contained in:
Tom Lane
2004-07-17 03:32:14 +00:00
parent f4c069ca8f
commit fe548629c5
41 changed files with 2086 additions and 1192 deletions
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8
src/backend/storage/buffer/localbuf.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.56 2004/06/18 06:13:33 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.57 2004/07/17 03:28:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -19,6 +19,7 @@
#include "storage/bufmgr.h"
#include "storage/smgr.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
/*#define LBDEBUG*/
@@ -62,6 +63,8 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
#endif
LocalRefCount[i]++;
ResourceOwnerRememberBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(bufHdr));
if (bufHdr->flags & BM_VALID)
*foundPtr = TRUE;
else
@@ -88,6 +91,8 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
{
bufHdr = &LocalBufferDescriptors[b];
LocalRefCount[b]++;
ResourceOwnerRememberBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(bufHdr));
nextFreeLocalBuf = (b + 1) % NLocBuffer;
break;
}
@@ -179,6 +184,7 @@ WriteLocalBuffer(Buffer buffer, bool release)
{
Assert(LocalRefCount[bufid] > 0);
LocalRefCount[bufid]--;
ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
}
}