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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 16:17:12 +00:00
parent 311984fabc
commit 4e1b7c8656
1 changed files with 11 additions and 1 deletions
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12
contrib/pgstattuple/pgstattuple.c
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@ -1,5 +1,5 @@
/*
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.25.2.2 2009/03/31 22:55:41 tgl Exp $
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.25.2.3 2010/04/02 16:17:12 tgl Exp $
*
* Copyright (c) 2001,2002 Tatsuo Ishii
*
@ -277,6 +277,8 @@ pgstat_heap(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);
@ -303,6 +305,8 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
while (block <= tupblock)
{
CHECK_FOR_INTERRUPTS();
buffer = ReadBuffer(rel, block);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
stat.free_space += PageGetFreeSpace((Page) BufferGetPage(buffer));
@ -315,6 +319,8 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
while (block < nblocks)
{
CHECK_FOR_INTERRUPTS();
buffer = ReadBuffer(rel, block);
stat.free_space += PageGetFreeSpace((Page) BufferGetPage(buffer));
ReleaseBuffer(buffer);
@ -469,8 +475,12 @@ pgstat_index(Relation rel, BlockNumber start, pgstat_page pagefn,
}
for (; blkno < nblocks; blkno++)
{
CHECK_FOR_INTERRUPTS();
pagefn(&stat, rel, blkno);
}
}
relation_close(rel, AccessShareLock);