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.
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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.