[Boost-users] is boost 1.46.1 contain thread/read_write_mutex.hpp

dear boost progamers:   when I tried to compile from my g++4.5.2 a simple file which include #include ------- root@eric-laptop:/home/eric/cppcookbook/ch12# g++ -lboost_thread Example12-3.cpp Example12-3.cpp:3:45: fatal error: boost/thread/read_write_mutex.hpp: No such file or directory compilation terminated. --------- and I check from / of my ubuntuLinux with boost 1.46.1 I can not find any file name as read_wirte_mutex.hpp --------- root@eric-laptop:/# find . | grep read_write_mutex.hpp root@eric-laptop:/# --- and I can not digout from web how to make it compile under gcc/g++ plz help, Eric