Thrift: Allow for alternative Mutex initializers.

Summary:
Add an argument to the Mutex constructor.
It takes a pointer to a function that initializes the internal pthread_mutex_t.
We provide initializers for default pthread_mutex_t (which is our default),
adaptive mutexes, and recursive mutexes.

Reviewed By: hzhao, psaab, mcslee

Test Plan: Built libthrift.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@666362 13f79535-47bb-0310-9956-ffa450edef68
2 files changed