pub fn open_reader(dir: &Path) -> Result<Option<Arc<RedbStore>>, PlaneError>Expand description
Opens the journal to read beside its writer, in this process or
another: None when there is none (a read never creates one). Never
registered, moved aside or written — any write through it is refused.
§Errors
It cannot be read: a writer that holds it alone (an earlier speccoder build), damage, another format.