| Log Message: |
cpp: Add profiling hooks to Mutex, ReadWriteMutex() classes
Extend the Thrift C++ Concurrency library by allowing a user to register
a callback and a sample rate for lock primitive contention profiling.
The callback will be invoked approximately once every sampleRate calls
to Mutex::lock(), Mutex::timedlock(), ReadWriteLock::acquireRead(), or
ReadWriteLock::acquireWrite().
The callback receives a pointer to the mutex responsible and the time
waited on the lock in micros (whether the lock was successfuly acquire
or not). The user can then implement a registry of his choice to
log/collect this data as needed.
This can all be easily compiled out if it harms performance. By
default, there is no profiling callback, so the overhead is minimal
(one branch).
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incubator/thrift/trunk/lib/cpp/src/concurrency/Mutex.cpp