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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 16:16:51 +00:00
parent 4c10623306
commit 33065ef8bc
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 1.38 2009/06/11 14:48:52 momjian Exp $
* $PostgreSQL: pgsql/contrib/pgstattuple/pgstattuple.c,v 1.39 2010/04/02 16:16:51 tgl Exp $
*
* Copyright (c) 2001,2002 Tatsuo Ishii
*
@ -276,6 +276,8 @@ 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 HeapTupleSatisfiesVisibility */
LockBuffer(scan->rs_cbuf, BUFFER_LOCK_SHARE);
@ -302,6 +304,8 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
while (block <= tupblock)
{
CHECK_FOR_INTERRUPTS();
buffer = ReadBuffer(rel, block);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
stat.free_space += PageGetHeapFreeSpace((Page) BufferGetPage(buffer));
@ -313,6 +317,8 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
while (block < nblocks)
{
CHECK_FOR_INTERRUPTS();
buffer = ReadBuffer(rel, block);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
stat.free_space += PageGetHeapFreeSpace((Page) BufferGetPage(buffer));
@ -468,7 +474,11 @@ pgstat_index(Relation rel, BlockNumber start, pgstat_page pagefn,
}
for (; blkno < nblocks; blkno++)
{
CHECK_FOR_INTERRUPTS();
pagefn(&stat, rel, blkno);
}
}
relation_close(rel, AccessShareLock);