Hi All: It may be a simple question, but I have no idea now. So I want to post my question with you. Maybe you can help, thank you. It is about boost thread. I want to create a thread and pass a parameter to it. I found there are 2 ways in boost thread, they are: using bind, like *boost::thread thrd(boost::bind(&helloworld, "Bob"));* *thrd.join();* or construct a structure and do the following: *boost::thread thrd(helloworld("Bob"));* *thrd.join();* It works, really, like the demo code shown. But After I run 2 threads, I found 2 thread can not run concurrently. The second thread will blocked by the first thread. If the first thread never exit, the second thread never run. It is a very funny problem. But I really do not know what happen. Does anyone know about this topic? Thank you very much. -- With regards. Coofucoo Zhang