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You must hold a lock on the heap page when you call

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CheckForSerializableConflictOut(), because it can set hint bits.

YAMAMOTO Takashi
This commit is contained in:
Heikki Linnakangas 2011-03-04 15:37:09 +02:00
parent 12bf602f3f
commit ee3838b1d3
2 changed files with 6 additions and 5 deletions
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4
src/backend/access/heap/heapam.c
View File

@ -1472,10 +1472,10 @@ heap_fetch(Relation relation,
if (valid)
PredicateLockTuple(relation, tuple);
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
CheckForSerializableConflictOut(valid, relation, tuple, buffer);
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
if (valid)
{
/*

7
src/backend/storage/lmgr/predicate.c
View File

@ -3366,9 +3366,10 @@ XidIsConcurrent(TransactionId xid)
* If the transactions overlap (i.e., they cannot see each other's writes),
* then we have a conflict out.
*
* This function should be called just about anywhere in heapam.c that a
* tuple has been read. There is currently no known reason to call this
* function from an index AM.
* This function should be called just about anywhere in heapam.c where a
* tuple has been read. The caller must hold at least a shared lock on the
* buffer, because this function might set hint bits on the tuple. There is
* currently no known reason to call this function from an index AM.
*/
void
CheckForSerializableConflictOut(const bool visible, const Relation relation,