- If you open a few connections, and one of them breaks (for example,
due to a network error), another connections can be locked for time, which is
equal to network timeout of the broken connection. This happens due to
working with sockets in blocking mode and due to using one Selector for all
- All connections could become locked forever due to races between
Driver and Selector objects. Driver object removes itself from the Selector
non-atomically and a situation when Driver is alredy closed, but the Selector
refers to it could happen. In this case select() call in the Selector raise
an exeption due to self._transport.fileno() call on Driver where
self._transport is None. The selector doesn't handle errors on select(), so
the selector's thread will be stopped due to unhandled Exception.
- There is no checks on EINTR error on os.* calls.