* POC for supporting callback events that come from the worker
* linting fixes. ci_complete
* fix up units. ci_complete
* Try moving the sentinel put higher. ci_complete
* safeguards. ci_complete
* Move queue killing to terminate
* LINTING. ci_complete
* Subclass Queue, to add helper send_callback method
* Just use _final_q instead of adding another queue and thread
* Revert a few changes
* Add helper for inserting a TaskResult into the _final_q
* Add changelog fragment
* Address rebase issue
* ci_complete
* Add test to assert async poll callback from fork
* Don't use full path
* ci_complete
* Use _results_lock as a context manager
* Add new generic lock decorator, and use it with send_callback
