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I'm trying to write a fairly simple threaded application, but am new to boost's thread library. A simple test program I'm working on is: #include <iostream> #include <boost/thread.hpp> int result = 0; boost::mutex result_mutex; boost::thread_group g; void threaded_function(int i) { for(; i < 100000; ++i) {} { boost::mutex::scoped_lock lock(result_mutex); result += i; } } int main(int argc, char* argv[]) { using namespace std; // launch three threads boost::thread t1(threaded_function, 10); boost::thread t2(threaded_function, 10); boost::thread t3(threaded_function, 10); g.add_thread(&t1); g.add_thread(&t2); g.add_thread(&t3); // wait for them g.join_all(); cout << result << endl; return 0; } However, when I compile and run this program I get an output of $ ./test 300000 test: pthread_mutex_lock.c:87: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed. Aborted Obviously, the result is correct but I'm worried about this error message, especially because the real program, which has essentially the same structure, is getting stuck at the join_all() point. Can someone explain to me what is happening? Is there a better way to do this, i.e. launch a number of threads, store them in a external container, and then wait for them all to complete before continuing the program? Thanks for your help.

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