Hi, Here is a little explanation on the linx threads. Ingo molnar and ulrich drepper provided a set of kernel patches and a library (ntpl) to "comply" to the posix standard, and particulary the posix thread standard. The design model choosen is a 1-1 : one user thread is associated to one kernel thread. It's a simple and efficient way to schedule and manage the thread. Pthread is a user library and also a standard which means that the library provide just the interface and the core of the library changes with the operating system. For further informations, have a look here : http://people.redhat.com/~drepper/ and here http://yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html tyler tyler@xxxxxxxx -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/