By Diomidis Spinellis,Athens University of Economics and Business, Greece, May 2008 The FreeBSD,GNU/Linux,Solaris,and Windows operating systems have kernels that provide comparable facilities. Interestingly, their code bases share almost no comm

posit的两个函数，一个老版本，一个新版本，很实用，还不错的。-posit two functions, and an older version, a new version, it is practical, but also good.