I'm trying to set several threads running and have the main thread signal an interrupt. I've included an example that shows what I'm trying to accomplish. The threads that are created are associated with thread_group and then a join_all is called. I would expect the main thread to be able to call interrupt_all on the thread_group. Since this wasn't working I looked at what the join_all and interrupt_all function were actually doing. It turns out that thread_group has a mutex that is being called for each function and since the mutex for join_all is in use, the lock in interrupt_all is blocking. I understand why the mutex is there but am unclear how interrupt_all is suppose to work with join_all. To accomplish the functionality I need I have to use create_thread and store the return pointer in a list of my own. Then call interrupt on each pointer I stored. Which is basically duplicating the storage of thread_group. This seem like a waste. I would appreciate any advice. Ryan class Converter { public: Converter(void) { m_Threads.reset(new boost::thread_group); } void run(void) { m_Threads->add_thread(new boost::thread(boost::bind(&Converter::processSureTrakMessage, this))); //m_Threads_v.push_back(m_Threads->create_thread(boost::bind(&Converter::processSureTrakMessage, this))); m_Threads->join_all(); m_Threads.reset(new boost::thread_group); } void stop(void) { //for (std::vector::iterator iter = m_Threads_v.begin(); iter != m_Threads_v.end(); ++iter) { // (*iter)->interrupt(); //} m_Threads->interrupt_all(); } void processMessage(void) { try { for (;;) { boost::this_thread::interruption_point(); } } catch (...) { int bob = 1; } int bobo = 2; } private: boost::scoped_ptrboost::thread_group m_Threads; boost::scoped_ptrboost::thread m_IO_Service_Thread; std::vector m_Threads_v; }; boost::function console_ctrl_function; BOOL WINAPI console_ctrl_handler(DWORD ctrl_type) { switch (ctrl_type) { case CTRL_C_EVENT: case CTRL_BREAK_EVENT: case CTRL_CLOSE_EVENT: case CTRL_SHUTDOWN_EVENT: console_ctrl_function(); return TRUE; default: return FALSE; } } int main(int argc, char * argv[]) { Converter convert; console_ctrl_function = boost::bind(&Converter::stop, &convert); SetConsoleCtrlHandler(console_ctrl_handler, TRUE); convert.run(); return 0; }