public ProgramModule getRootModule(String treeName) {
		lock.acquire();
		try {
			ModuleManager m = treeMap.get(treeName);
			if (m != null) {
				return m.getRootModule();
			}
		}
		catch (IOException e) {
			errHandler.dbError(e);
		}
		finally {
			lock.release();
		}
		return null;

	}
Get the root module of the tree with the given name.
@param treeName tree name
@return root module, or null if there is no tree with the
given name
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/module/TreeManager.java