context switch

最新推荐文章于 2024-12-11 15:26:26 发布

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最新推荐文章于 2024-12-11 15:26:26 发布

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本文详细介绍了计算机中的上下文切换概念，这是一种将进程的状态保存并恢复的过程，以便可以在稍后的某个时间点从同一位置继续执行。这是多任务操作系统的一个关键特性，使多个进程能够在单一CPU上共享执行时间。文章还讨论了上下文切换的计算密集型性质及其对操作系统设计的影响。

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In computing, a context switch is the process of storing and restoring the state (context) of a process so that execution can be resumed from the same point at a later time. This enables multiple processes to share a single CPU and is an essential feature of a multitasking operating system. What constitutes the context is determined by the processor and the operating system.

Context switches are usually computationally intensive, and much of the design of operating systems is to optimize the use of context switches. Switching from one process to another requires a certain amount of time for doing the administration - saving and loading registers and memory maps, updating various tables and lists etc.

A context switch can mean a register context switch, a task context switch, a stack frame switch, a thread context switch, or a process context switch.