@Override
	public SourceType getSignatureSource() {
		manager.lock.acquire();
		try {
			checkIsValid();
			if (thunkedFunction != null) {
				return thunkedFunction.getSignatureSource();
			}

			return getStoredSignatureSource();
		}
		finally {
			manager.lock.release();
		}
	}
Sets the indicated function flag to true or false.

@param functionFlagIndicator
           the function flag from the FunctionAdapter class (i.e.
           FunctionAdapter.FUNCTION_VARARG_FLAG,
           FunctionAdapter.FUNCTION_INLINE_FLAG,
           FunctionAdapter.FUNCTION_NO_RETURN_FLAG,
           FunctionAdapter.FUNCTION_CUSTOM_PARAM_STORAGE_FLAG)
@param shouldBeSet
           true means the indicated flag should be set.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionDB.java