tree cb7022d285bde4c6b5e7fb57ee2acd41e8abd759
parent 1ee975f50fb6957ef8ba9c08b785b288c9f2c0af
author Marie Janssen <jamuraa@google.com> 1478136715 -0700
committer Marie Janssen <jamuraa@google.com> 1478278977 -0700

Replace pthread_mutex with std::mutex

In an effort to simplify and reduce errors, replace pthread_mutexes
with std equivalents.

Test: run unit tests & manual sanity checks
Change-Id: Ia6492b0007dca311ebd1579f52b206993b7535fd