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Fix nasty little order-of-operations bug in _SPI_cursor_operation. 

Per report from Mendola Gaetano.
This commit is contained in:
Tom Lane 2003-08-08 19:18:21 +00:00
parent 4ae02fd03e
commit 332c694085
1 changed files with 17 additions and 6 deletions
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17
src/backend/executor/spi.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.101 2003/08/04 02:39:59 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.102 2003/08/08 19:18:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1263,6 +1263,8 @@ static void
_SPI_cursor_operation(Portal portal, bool forward, int count,
DestReceiver *dest)
{
long nfetched;
/* Check that the portal is valid */
if (!PortalIsValid(portal))
elog(ERROR, "invalid portal in SPI cursor operation");
@ -1277,12 +1279,21 @@ _SPI_cursor_operation(Portal portal, bool forward, int count,
_SPI_current->tuptable = NULL;
/* Run the cursor */
_SPI_current->processed =
PortalRunFetch(portal,
nfetched = PortalRunFetch(portal,
forward ? FETCH_FORWARD : FETCH_BACKWARD,
(long) count,
dest);
/*
* Think not to combine this store with the preceding function call.
* If the portal contains calls to functions that use SPI, then
* SPI_stack is likely to move around while the portal runs. When
* control returns, _SPI_current will point to the correct stack entry...
* but the pointer may be different than it was beforehand. So we must
* be sure to re-fetch the pointer after the function call completes.
*/
_SPI_current->processed = nfetched;
if (dest->mydest == SPI && _SPI_checktuples())
elog(ERROR, "consistency check on SPI tuple count failed");