/*
* PortalDrop
* Destroy the portal.
*
* isError: if true, we are destroying portals at the end of a failed
* transaction. (This causes PortalCleanup to skip unneeded steps.)
*/
void
PortalDrop(Portal portal, bool isError)
{
AssertArg(PortalIsValid(portal));
/* Not sure if this case can validly happen or not... */
if (portal->portalActive)
elog(ERROR, "cannot drop active portal");
/*
* Remove portal from hash table. Because we do this first, we will
* not come back to try to remove the portal again if there's any
* error in the subsequent steps. Better to leak a little memory than
* to get into an infinite error-recovery loop.
*/
PortalHashTableDelete(portal);
/* let portalcmds.c clean up the state it knows about */
if (PointerIsValid(portal->cleanup))
(*portal->cleanup) (portal, isError);
/*
* Delete tuplestore if present. We should do this even under error
* conditions; since the tuplestore would have been using cross-
* transaction storage, its temp files need to be explicitly deleted.
*/
if (portal->holdStore)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(portal->holdContext);
tuplestore_end(portal->holdStore);
MemoryContextSwitchTo(oldcontext);
portal->holdStore = NULL;
}
/* delete tuplestore storage, if any */
if (portal->holdContext)
MemoryContextDelete(portal->holdContext);
/* release subsidiary storage */
MemoryContextDelete(PortalGetHeapMemory(portal));
/* release portal struct (it's in PortalMemory) */
pfree(portal);
}
/*
* PortalDrop
* Destroy the portal.
*/
void
PortalDrop(Portal portal, bool isTopCommit)
{
AssertArg(PortalIsValid(portal));
/* Not sure if this case can validly happen or not... */
if (portal->status == PORTAL_ACTIVE)
elog(ERROR, "cannot drop active portal");
/*
* Remove portal from hash table. Because we do this first, we will not
* come back to try to remove the portal again if there's any error in the
* subsequent steps. Better to leak a little memory than to get into an
* infinite error-recovery loop.
*/
PortalHashTableDelete(portal);
/* let portalcmds.c clean up the state it knows about */
if (PointerIsValid(portal->cleanup))
(*portal->cleanup) (portal);
/*
* Release any resources still attached to the portal. There are several
* cases being covered here:
*
* Top transaction commit (indicated by isTopCommit): normally we should
* do nothing here and let the regular end-of-transaction resource
* releasing mechanism handle these resources too. However, if we have a
* FAILED portal (eg, a cursor that got an error), we'd better clean up
* its resources to avoid resource-leakage warning messages.
*
* Sub transaction commit: never comes here at all, since we don't kill
* any portals in AtSubCommit_Portals().
*
* Main or sub transaction abort: we will do nothing here because
* portal->resowner was already set NULL; the resources were already
* cleaned up in transaction abort.
*
* Ordinary portal drop: must release resources. However, if the portal
* is not FAILED then we do not release its locks. The locks become the
* responsibility of the transaction's ResourceOwner (since it is the
* parent of the portal's owner) and will be released when the transaction
* eventually ends.
*/
if (portal->resowner &&
(!isTopCommit || portal->status == PORTAL_FAILED))
{
bool isCommit = (portal->status != PORTAL_FAILED);
ResourceOwnerRelease(portal->resowner,
RESOURCE_RELEASE_BEFORE_LOCKS,
isCommit, false);
ResourceOwnerRelease(portal->resowner,
RESOURCE_RELEASE_LOCKS,
isCommit, false);
ResourceOwnerRelease(portal->resowner,
RESOURCE_RELEASE_AFTER_LOCKS,
isCommit, false);
ResourceOwnerDelete(portal->resowner);
}
portal->resowner = NULL;
/*
* Delete tuplestore if present. We should do this even under error
* conditions; since the tuplestore would have been using cross-
* transaction storage, its temp files need to be explicitly deleted.
*/
if (portal->holdStore)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(portal->holdContext);
tuplestore_end(portal->holdStore);
MemoryContextSwitchTo(oldcontext);
portal->holdStore = NULL;
}
/* delete tuplestore storage, if any */
if (portal->holdContext)
MemoryContextDelete(portal->holdContext);
/* release subsidiary storage */
MemoryContextDelete(PortalGetHeapMemory(portal));
/* release portal struct (it's in PortalMemory) */
pfree(portal);
}
