Enum fifo::WouldBlock

pub enum WouldBlock {
    Nonblock,
    Sleep(u64),
}

What can we do when operations on Sender or Receiver would block.

1) Just return Err(ErrorKind::WouldBlock) immediately; or 2) sleep for some milliseconds.

The default on Sender and Receiver is Sleep(10).

Variants

NonblockSleep(u64)