Function expand_view_lock

src/jrd/tra.cpp:2170–2296

static void expand_view_lock(thread_db* tdbb, jrd_tra* transaction, jrd_rel* relation,
	UCHAR lock_type, const char* option_name, RelationLockTypeMap& lockmap, const int level)
{
/**************************************
 *
 *	e x p a n d _ v i e w _ l o c k
 *
 **************************************
 *
 * Functional description
 *	A view in a RESERVING will lead to all tables in the
 *	view being locked.
 *  Some checks only apply when the user reserved directly the table or view.
 *
 **************************************/
	SET_TDBB(tdbb);

	if (level == 30)
	{
		ERR_post(Arg::Gds(isc_bad_tpb_content) <<
				 Arg::Gds(isc_tpb_reserv_max_recursion) << Arg::Num(30));
	}

	const char* const relation_name = relation->rel_name.c_str();

	// LCK_none < LCK_SR < LCK_PR < LCK_SW < LCK_EX
	UCHAR oldlock;
	const bool found = lockmap.get(relation->rel_id, oldlock);

	if (found && oldlock > lock_type)
	{
		const char* newname = get_lockname_v3(lock_type);
		const char* oldname = get_lockname_v3(oldlock);

		if (level)
		{
			lock_type = oldlock; // Preserve the old, more powerful lock.
			ERR_post_warning(Arg::Warning(isc_tpb_reserv_stronger_wng) << Arg::Str(relation_name) <<
																		  Arg::Str(oldname) <<
																		  Arg::Str(newname));
		}
		else
		{
			ERR_post(Arg::Gds(isc_bad_tpb_content) <<
					 Arg::Gds(isc_tpb_reserv_stronger) << Arg::Str(relation_name) <<
														  Arg::Str(oldname) <<
														  Arg::Str(newname));
		}
	}

	if (level == 0)
	{
		fb_assert(!relation->rel_view_rse && !relation->rel_view_contexts.getCount());
		// Reject explicit attempts to take locks on virtual tables.
		if (relation->isVirtual())
		{
			ERR_post(Arg::Gds(isc_bad_tpb_content) <<
					 Arg::Gds(isc_tpb_reserv_virtualtbl) << Arg::Str(relation_name));