exception: Add WorkerErrorException and get_traceback

- Add get_traceback -- a utility for getting the traceback for
  the current exception.
- Add WorkerErrorException that is used to capture and propagate
  exceptions from a  worker thread on the main thread.
1 file changed
tree: 1d5228c701bb45d36ae5a61d8ba02900d5f71206
  1. devlib/
  2. doc/
  3. src/
  4. .gitignore
  5. README.rst
  6. setup.py