We can't yet replace uses of stdx::mutex where it is used with stdx::condition_variable (or similar external interfaces). However, we can go through and replace all uses where it is used for simple unique_lock/lock_guard.
- depends on
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                    SERVER-41357 Add mongo::mutex polyfill -         
- Closed
 
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- is depended on by
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                    SERVER-41408 Replace remaining uses of stdx::mutex with mongo::mutex -         
- Closed
 
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