以Linux 系统进程和线程机制为背景，掌握fork()和clone()系统调用的形式和功能以及与其相适应的高级通讯方式。由fork派生的子进程之间通过pipe通讯，由clone创建的线程之间通过共享内存通讯，对于后者需要考虑互斥问题。-Linux systems to process and thread mechanism background, master fork () and clone () system call form and function as well as advanced communication therewith adaptation. Between the child process via fork derived　pipe communication between threads by clone created by the shared memory communication, the latter issues need to be considered mutually exclusive.