Dmitry Shulyak 84cb5ca917 Ensure that wg.Add is called before wg.Wait
Now if Add is to be called it will be called before Wait, this is achieved
by doing following:
- if cancel() gets lock first and closes channelCh before spawnSync is called
we will exit right away
- if not than we will ensure that we hold a lock until syncers are spawned
so that cancel() will be blocked for this time and it will prevent whole Terminate() from
progressing
2018-05-04 10:28:15 +02:00
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