module Sync
  enum Type
    # The lock doesn't do any checks. Trying to relock will cause a deadlock,
    # unlocking from any fiber is undefined behavior.
    Unchecked

    # The lock checks whether the current fiber owns the lock. Trying to
    # relock will raise a `Error::Deadlock` exception, unlocking when unlocked
    # or while another fiber holds the lock will raise an `Error`.
    Checked

    # Same as `Checked` with the difference that the lock allows the same
    # fiber to re-lock as many times as needed, then must be unlocked as many
    # times as it was re-locked.
    Reentrant
  end
end