I'm using boost svn 50746 (latest at time of writing), on 32-bit Ubuntu Intrepid Ibex, with gcc/g++ 4.3.2 This is a simple test case showing that for some reason, message_queue::timed_receive is returning immediately for me, not throwing an exception, but just returning false which signifies that the timeout has been reached. The output of the program is as follows: Current time: 2009-Jan-23 17:40:29 After delay: 2009-Jan-23 17:40:34 Timeout at 2009-Jan-23 17:40:29 Note that the timeout occurs before it is supposed to, it returns instantly. Is this a bug, or am I doing something wrong? MINIMAL CODE: #include <iostream> #include #include // Link with boost_date_time int main(void) { char buf[1024]; std::size_t uSize; unsigned int priority; // Create a queue boost::interprocess::message_queue::remove("SOME_QUEUE"); boost::interprocess::message_queue mq(boost::interprocess::create_only,"SOME_QUEUE",1024,1024); // 5 second delay boost::posix_time::time_duration delay(boost::posix_time::seconds(5)); // current time boost::posix_time::ptime timeout = boost::posix_time::ptime(boost::posix_time::second_clock::local_time()); std::cout << "Current time: " << boost::posix_time::to_simple_string(timeout) << std::endl; timeout += delay; std::cout << "After delay: " << boost::posix_time::to_simple_string(timeout) << std::endl; if (mq.timed_receive(buf,sizeof(buf),uSize,priority,timeout)) { std::cout << "Got a message!" << std::endl; } else { std::cout << "Timeout at " << boost::posix_time::to_simple_string(boost::posix_time::ptime(boost::posix_time::second_clock::local_time()))<< std::endl; } return 0; }