sched_setaffinity and NPTL threads.

Hi folks, I'm trying to use sched_setaffinity to force threads onto certain CPU's. However the header file indicates it takes a pid_t. Now, this would be fine with LinuxThreads, but 2.6 uses NPTL and thus the pid is the same for all threads in the process. The page says I can specify '0' to mean the current process, but I'm not sure if it's doing the right thing under the covers. I figured I would post here before posting to the LKML. Any ideas how to force NPTL threads to certain CPU's through the API? Philip Mucci