src/core/system-thread.h
2009-11-12 replace RefCountBase with SimpleRefCount<> to avoid duplicate refcounting implementations.
2009-11-10 correct some wildly out-of-date doxygen
2009-09-18 Fix some doxygen warnings revealed by WARN_NO_PARAMDOC=YES in doc/doxygen.conf.
2008-10-24 branch merge
2008-10-23 structured thread exit methods
2008-07-15 add system threads and synchronization primitives
2006-08-29 change yans namespace to ns3
2006-08-29 import from yans