tree 35318367c65d8a46400ab0fec57102588e96a095
parent 4cc0755b3382abc3e17ebba0ab4c2c78b9a8bbd7
author David Reiss <dreiss@apache.org> 1268112004 +0000
committer David Reiss <dreiss@apache.org> 1268112004 +0000

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).

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@920681 13f79535-47bb-0310-9956-ffa450edef68