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Anything that links against joblist will spin up a threadpool upon startup. This includes the tools setConfig/getConfig. It is possible on a low core count machine or low CPU speed that the signal to the prune thread to shutdown is sent before the thread has completed startup when these quick-running tools are used. This fix adds a mutex so that spin up and shutdown can't happen at the same time as well as a stop watch in case we are shutting down when either the thread is running or we haven't fully started.