摘要：1.Preemptive scheduling CPU scheduling decisons may take place under the following four conditions: 1.when a process switches from running state to the waiting state(for example, I/O Request ... 阅读全文

摘要：abstract: A process is an basic element to allocate resource from system. Process concept:[进程的基本概念] Informally, a process is a program in execution. A process is more than the program code, whitch is... 阅读全文