在采用多道程序设计的系统中，往往有若干个进程同时处于就绪状态。当就绪状态进程个数大于处理器数时，就必须依照某种策略来决定哪些进程优先占用处理器。本源代码模拟在单处理器情况下处理器调度-the introduction of multi-channel programming system, often there are a number of processes at the same time readiness. When the readiness of the process is g