comp.programming.threads - join
All issues about multithreaded programming.
Medium activity, 2420 subscribers, Usenet

comp.os.linux.development.apps - join
Writing Linux applications, porting to Linux.
Low activity, 1677 subscribers, Usenet

comp.os.linux.development.system - join
Linux kernels, device drivers, modules.
Low activity, 2293 subscribers, Usenet