[Bug] Server stop functionality is unresponsive

[3manifold]

Description

It was observed that the server stop functionality during a KeyboardInterrupt in unresponsive. Ideally, stop functionality should work in both of the following scenarios (currently not the case):

• Scenario 1:
  • start server -> stop server
• Scenario 2:
  • start server -> start client -> stop server

Reproduce

An example scenario can be reproduced locally by following the steps below:

1. python3 s2s_pipeline.py --recv_host 0.0.0.0 --send_host 0.0.0.0 # wait for server to start..
2. kill -2 <server_PID> # send KeyboardInterrupt signal to server
3. # server does not stop

This bug also relates to issue #139 . Implementation and a description of the fix can be found in pull request #138 .