Freebsd OS kenel 簡介 ，包括內核與進程的所有方式。-Freebsd OS kenel profiles, including all the ways the kernel and processes.

讲述了linux kenel中的阻塞机制和如何处理及实现一个阻塞，使应用程序能异步执行。-About the the linux kenel blocking mechanism and how to deal with and implement a block, so that the application can be executed asynchronously.