Review Request 35094: Update libprocess gate to use synchronized.

[Joris Van Remoortere]

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https://reviews.apache.org/r/35094/
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Review request for mesos, Benjamin Hindman and Bernd Mathiske.


Bugs: MESOS-2805
    https://issues.apache.org/jira/browse/MESOS-2805


Repository: mesos


Description
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See summary.


Diffs
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  3rdparty/libprocess/src/gate.hpp 69c906baabbc05fdc33aca94b587fc3c8633f7b6 

Diff: https://reviews.apache.org/r/35094/diff/


Testing
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Thanks,

Joris Van Remoortere