Linux 快速用户态互斥锁例程。

linux2.5以上内核，支持Futex，对于刚接触的用户，使用起来非常麻烦，这部分源码，详尽的利用futex基础原理，进行了封装，并且给出了几个测试例子。-Fast User Mode Linux mutex locking routines. linux2.5 above kernel, support Futex, for the new to the user, is very cumbersome to use, this part of the source, using futex based on detailed principles for the package, and gives examples of several tests.