FakeBkgTools: address ATLASG-2756
Implementing two of Scott's suggestion in the ticket, i.e. widening the critical section to the whole function (which should suppress the Coverity warning) and adding a comment to motivate the mutex usage.
Implementing two of Scott's suggestion in the ticket, i.e. widening the critical section to the whole function (which should suppress the Coverity warning) and adding a comment to motivate the mutex usage.