Github user jeking3 commented on a diff in the pull request: https://github.com/apache/thrift/pull/980#discussion_r60614134 --- Diff: lib/cpp/src/thrift/concurrency/ThreadManager.cpp --- @@ -421,7 +416,7 @@ void ThreadManager::Impl::removeWorker(size_t value) { { Synchronized s(workerMonitor_); - while (workerCount_ != workerMaxCount_) { + while (workerCount_ > goalCount) { --- End diff -- ThreadManager should probably be tossed out; removeWorker is inherently dangerous for a variety of reasons just like this. In particular I can see a scenario where multiple workers simultaneously try to reduce the worker count by the same amount and fail badly because they both thought there were 5 workers and they both asked to removeWorker(3). The API would be much better as specifying what the new limit should be and the reduction of intention vs setting a barrier until you get there should be separate operations. It seems pretty fragile as-is and I think the whole thing needs a rethink.
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