def init():
    """
    Initialize module globals.  This can invoke external utilities, hence not
    being executed implicitly at module import.
    """
    global ffi, cffi_sin, cffi_cos, cffi_bool

    if ffi is None:
        ffi, dll = load_inline_module()
        cffi_sin = dll._numba_test_sin
        cffi_cos = dll._numba_test_cos
        cffi_bool = dll._numba_test_boolean
        del dll

    Initialize module globals.  This can invoke external utilities, hence not
    being executed implicitly at module import.
    
numba/tests/cffi_usecases.py