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Ensure that contrib/pgstattuple functions respond to cancel interrupts

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reasonably promptly, by adding CHECK_FOR_INTERRUPTS in the per-page loops.

Tatsuhito Kasahara
This commit is contained in:
Tom Lane 2010-04-02 16:17:18 +00:00
parent 03ecb57737
commit c383ff4ca1
1 changed files with 8 additions and 1 deletions
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9
contrib/pgstattuple/pgstattuple.c
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@ -1,5 +1,5 @@
/*
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.20.2.1 2009/03/31 22:56:05 tgl Exp $
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.20.2.2 2010/04/02 16:17:18 tgl Exp $
*
* Copyright (c) 2001,2002 Tatsuo Ishii
*
@ -29,6 +29,7 @@
#include "access/heapam.h"
#include "access/transam.h"
#include "catalog/namespace.h"
#include "miscadmin.h"
#include "utils/builtins.h"
@ -145,6 +146,8 @@ pgstattuple_real(Relation rel, FunctionCallInfo fcinfo)
/* scan the relation */
while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
{
CHECK_FOR_INTERRUPTS();
/* must hold a buffer lock to call HeapTupleSatisfiesNow */
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_SHARE);
@ -171,6 +174,8 @@ pgstattuple_real(Relation rel, FunctionCallInfo fcinfo)
while (block <= tupblock)
{
CHECK_FOR_INTERRUPTS();
buffer = ReadBuffer(rel, block);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
free_space += PageGetFreeSpace((Page) BufferGetPage(buffer));
@ -183,6 +188,8 @@ pgstattuple_real(Relation rel, FunctionCallInfo fcinfo)
while (block < nblocks)
{
CHECK_FOR_INTERRUPTS();
buffer = ReadBuffer(rel, block);
free_space += PageGetFreeSpace((Page) BufferGetPage(buffer));
ReleaseBuffer(buffer);