Terminate context hang

jeromq_context_term_hang_bug.md

Main Thread:

• create context (zmq/context 1)
• create workers and pass them the context
• start the worker threads
• addShutdownHook
  • shutdown the worker threads
  • join the worker threads
  • sleep 2s ;; without this line the terminate context sometimes hangs, with it so far it has never hung
  • terminate the context (.term context) ;; sometimes hangs here

Worker Thread:

• Use the context to create some sockets
  • sockets are created using with-open so they get auto closed
  • sockets have their linger value set to 100ms
• Use context to create poller (zmq/poller context 1)
• Register main receive socket with poller (zmq/register poller client :pollin)
• Loop, poll for data on main receive socket, timeout then loop
• If the shutdown flag is set, then
  • unregister main receive socket from poller (zmq/unregister poller client)
  • close all the sockets that we created - actually get autoclosed from with-open
• done