用c语言详解的关于操作系统中得多道系统中多进程并发执行，为了提高系统性能解决进程死锁问题，进程的优先级是动态变化的。正在执行的进程优先级会随时间降低，而挂起的进程或等待的进程的优先级会逐渐升高，这样就解决了操作系统中一个地优先级程序长期占据cpu，而高优先级进程却迟迟不能得到处理。

-Concurrent execution on multi-process operating system in much the system using c language Detailed, in order to improve system performance to the process of resolving a deadlock problem, the priority of the process is dynamic. The process of being implemented priority over time decreased, while the suspended process or wait for the process of priority will be gradually increased, this would resolve the operating system a priority program have long occupied the cpu, while the high-priority process the delay can not be processed.