Review Request 35097: Update mesos executor to use synchronized.

[Joris Van Remoortere]

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https://reviews.apache.org/r/35097/
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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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  include/mesos/executor.hpp f3cd3ccd505ed4b308a1a42b238fc21fe45cc3b3 
  src/exec/exec.cpp a22e8bbf146983937e6fae00af601f9e886e88f1 

Diff: https://reviews.apache.org/r/35097/diff/


Testing
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Thanks,

Joris Van Remoortere