adding a fibers compatible once flag
Summary: The current folly::once_flag is not compatible with folly fibers and when using it with fibers is inefficient and also cause deadlocks. This diff makes the once flag's mutex be a templatable paramter and overrides it in fibers library with a fiber compatible mtuex. Reviewed By: yfeldblum Differential Revision: D6288508 fbshipit-source-id: 6f82e1794d1f417f8d267061f1702a26a7b4ff12
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folly/fibers/CallOnce.h
0 → 100644
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