linux下的一个基本定时器,精确到ms。访问接口类似于windows下的setTimer接口。-linux under a basic timer, accurate to ms. Access interface similar to the windows under the setTimer interface.
系统调用是系统内核和应用程序的接口
此代码展示了linux系统调用的实现-system is called the kernel and application program interface that this code to display the Linux system call the realization