tree fb9c34196fd295ad9b44c232a41def64acfabe2a
parent 07d4ed1b5cbabc006ee52e8734f74198914263c9
author John Eikenberry <jae@zhar.net> 1499129635 -0700
committer John Eikenberry <jae@zhar.net> 1499129635 -0700

avoid data race in worker creation

There is a data race with the waitgroup (wg) object used to synchronize
the workers with the server exit. The workers called wg.Add()
asynchronously and it was possible for the Wait() to get hit before any
of the Add() calls were made in certain conditions. I only ever saw this
sporatically in the travis tests.

This fixes it by making the wg.Add() calls synchronous.