https://blog.csdn.net/yx444535180/article/details/116206939
namespace的本质就是把原来所有进程全局共享的资源拆分成了很多个一组一组进程共享的资源
https://blog.csdn.net/qq_36752632/article/details/102800940
https://blog.csdn.net/yx444535180/article/details/116206939
https://blog.csdn.net/qq_36752632/article/details/102800940