wait for the job mutex to be released when it is completed immediatly

Ignore-this: f330734adfece82a778cccf471261267

darcs-hash:20130430224942-c41ad-45e6f0c9d038d6053a37ee783f485093da90cf03.gz
typo

Ignore-this: 7a0b4023831c5c9a01e0dc2946f6286b

darcs-hash:20130505183924-c41ad-b80799bce1cc4075fcc2437fcde4e00bbffd32a0.gz