Yifan Gu a489bd2674 pkg/util/flock: Fix the flock so it actually locks. ...

With this PR, the second call to `Acquire()` will block unless the lock is released (process exits).
Also removed the memory mutex in the previous code since we don't need `Release()` here so no need to save and protect the local fd.

Fix #42929.

2017-03-13 14:24:59 -07:00

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