Function enqueue_fill_buffer 

pub unsafe fn enqueue_fill_buffer(
    command_queue: cl_command_queue,
    buffer: cl_mem,
    pattern: *const c_void,
    pattern_size: size_t,
    offset: size_t,
    size: size_t,
    num_events_in_wait_list: cl_uint,
    event_wait_list: *const cl_event,
) -> Result<cl_event, cl_int>