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I am trying to wrap a piece of C++ code into python lib using boost.python, however, I found out that multiple instances cannot run at the same time: code (C++): class Foo{ public: Foo(){} void run(){ int seconds = 2; clock_t endwait; endwait = clock () + seconds * CLOCKS_PER_SEC ; while (clock() < endwait) {} } }; BOOST_PYTHON_MODULE(run_test) { using namespace boost::python; class_<Foo>("test", init<>()) .def("run", &Foo::run) ; } which is compile using CMake (CMake): add_library(run_test SHARED run_test.cpp) target_link_libraries(run_test boost_python python2.7) and tested with the following code (Python): class Dos(threading.Thread): def run(self): printl('performing DoS attack') proc = test() proc.run() for i in range(5): t = Dos() t.start() The output indicates that the code is parallelized in a very weird way. Each thread should take only 2 seconds and 4 threads should run simultaneously on my quadcore machine: [2011-11-04 13:57:01] performing DoS attack [2011-11-04 13:57:01] performing DoS attack [2011-11-04 13:57:05] performing DoS attack [2011-11-04 13:57:05] performing DoS attack [2011-11-04 13:57:09] performing DoS attack thank you for your help!

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