pub unsafe extern "C" fn dispatch_data_create(
buffer: *const c_void,
size: usize,
queue: dispatch_queue_t,
destructor: dispatch_block_t,
) -> dispatch_data_tpub unsafe extern "C" fn dispatch_data_create(
buffer: *const c_void,
size: usize,
queue: dispatch_queue_t,
destructor: dispatch_block_t,
) -> dispatch_data_t