cpp: Let Monitors share Mutex instances
- Let Monitor objects share a Mutex() instance so that more than one
condition can be implemented on top of a single mutex protecting an
important data structure.
- Make Mutex and Monitor noncopyable
- Add an accessor to Mutex() so the underlying pthread_mutex_t* can be
retrieved for passing to pthread_condwait
- Change Monitor to use the actual Mutex class instead of creating a
naked pthread_mutex_t on its own
- Add new constructors to Monitor
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incubator/thrift/trunk/lib/cpp/src/concurrency/Monitor.cpp