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Review request for mesos, Benjamin Hindman and Joris Van Remoortere.

Repository: mesos


The initialization synchronization logic contains three conditions, which check:
1) Was `initialize` called and is it done?
2) Was `initialize` called and is it not done?
3) Are you the first to call `initialize`?

Condition (3) uses `compare_exchange_strong` between `initialized` and `false`. 
 This returns `true` (and sets `initialized` to true) iff the caller is the 
first to reach that expression.

The second simultaneous caller of `initialize` will either satisify condition 
(2) or (3) and then wait on `initializing`.  For the second caller, (2) and (3) 
are identical because `compare_exchange_strong` between `true` and `false` will 
always return false, thereby putting the second caller into the waiting loop.


  3rdparty/libprocess/src/process.cpp a94712b9ac3b60fb047b3a5a4d84a56fa4d02313 

Diff: https://reviews.apache.org/r/39949/diff/


`make check`


Joseph Wu

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