libcstl是使用C语言编写的一个通用的数据结构和常用的算法库，它模仿SGI STL的接口和实现。-libcstl is the use of C language, a common data structure and used algorithms library, which mimic the interface and the SGI STL to achieve.

Calling os_getpid because some libcs cached getpid incorrectly.