进程同步：在多道程序环境下，进程是并发执行的，不同进程之间存在着不同的相互制约关系。
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在操作系统课程的教学中，进程同步是其中一个重点，也是难点。
Process synchronization is an emphasis and difficulty in the teaching of operating system course.
该文探讨了进程同步的教学方法，从易到难，循序渐进，边分析边讲解。
Teaching method of process synchronization is discussed, that is teaching from easy to difficult, step by step, explaining while analyzing.
这些设施包括打开文件句柄(文件描述符)、共享内存、进程同步原语和当前目录。
Facilities include open file handles (file descriptors), Shared memory, process synchronization primitives, and current directory.
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