ABB机器人伺服电机 3HAC020208-001
进程调度信息
在PCB中还存放了一些与进程调度和进程对换有关的信息。
（1）进程状态。指明进程当前的状态，作为进程调度和对换时的依据。
（2）进程优先级。用于描述进程使用处理机的优先级别的一个整数，优先级高的进程优先获得处理机。
（3）进程调度所需要的其他信息。（进程已等待CPU的时间总和、进程已执行的时间总和）
（4）事件。这是进程由执行状态转变为阻塞状态所等待发生的事件。（阻塞原因）
进程上下文：
是进程执行活动全过程的静态描述。包括计算机系统中与执行该进程有关的各种寄存器的值、程序段在经过编译之后形成的机器指令代码集、数据集及各种堆栈值和PCB结构。可按一定的执行层次组合，如用户级上下文、系统级上下文等。
进程存在的***标志
在进程的整个生命周期中，系统总是通过PCB对进程进行控制的，亦即，系统是根据进程的PCB而不是任何别的什么而感知到该进程的存在的，所以说，PCB是进程存在的***标志。
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