Hallo, we make heavy use of Qt in our software and are now trying to use llvm thread sanitizer for debugging. Unfortunately the sanitizer doesn't seem to recognize QMutex as a locking mechanism. The example below warns about a race condition because the member "data" is accessed in two threads. If you use a boost::mutex instead, the warning disappears. If "data" is a global variable, the false warning is also not shown.
What are the differences between the two mutex variants? Shouldn't both use pthread_mutex internally on a linux system? Are there any experiences in debugging Qt programs with llvm thread sanitizer? Thanks in advance, Benjamin P.S.: I have also posted this question in the qt-project.org forum: http://qt-project.org/forums/viewthread/38975/ #include <QtConcurrentRun> #include <QMutex> #include <iostream> #include <boost/thread/mutex.hpp> //int data; class TestClass { public: void fun() { QMutexLocker autoMutex(&mutex); //boost::mutex::scoped_lock bautoMutex(bmutex); data = 1; } private: int data; QMutex mutex; boost::mutex bmutex; }; int main() { TestClass *tc = new TestClass; QFuture<void> t1 = QtConcurrent::run(tc, &TestClass::fun); QFuture<void> t2 = QtConcurrent::run(tc, &TestClass::fun); t1.waitForFinished(); t2.waitForFinished(); return 0; }
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