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Andrew Hutchings 4f6949835d MCOL-1037 Fix race condition in FIFO buffer
The FIFO buffer could get data in next() whilst a data swap is happening
due to a rare race condition. This patch adds mutexes around the parts
that could race.

The observed effect of this race was during a complex aggregate query
the results would occasionally be incorrect.

In addition this fixes a race condition in PrimProc's regex processor.
2018-07-11 15:32:27 +01:00
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