Trap和Interrupt有什么区别? [英] What is the difference between Trap and Interrupt?

问题描述

陷阱和中断有什么区别?

What is the difference between Trap and Interrupt?

如果不同系统的术语不同，那么它们在x86上意味着什么?

If the terminology is different for different systems, then what do they mean on x86?

推荐答案

一个 陷阱 是用户流程中的例外.它是由零除或无效的内存访问引起的.这也是调用内核例程(系统调用的常用方法)，因为它们以更高的级别运行优先级高于用户代码.处理是同步的(因此，用户代码被挂起并随后继续).从某种意义上说，它们是活动的"-在大多数情况下，代码期望陷阱发生并依赖于此事实.

A trap is an exception in a user process. It's caused by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code. Handling is synchronous (so the user code is suspended and continues afterwards). In a sense they are "active" - most of the time, the code expects the trap to happen and relies on this fact.

中断 是由硬件(例如硬盘，图形卡，I/O端口等).这些是异步的(即它们不会在用户代码中可预测的位置发生)或被动"的，因为中断处理程序必须等待它们最终发生.

An interrupt is something generated by the hardware (devices like the hard disk, graphics card, I/O ports, etc). These are asynchronous (i.e. they don't happen at predictable places in the user code) or "passive" since the interrupt handler has to wait for them to happen eventually.

您还可以将陷阱视为一种CPU内部中断，因为陷阱处理程序的处理程序看起来像是中断处理程序(保存了寄存器和堆栈指针，存在上下文切换，在某些情况下可以恢复执行)离开).

You can also see a trap as a kind of CPU-internal interrupt since the handler for trap handler looks like an interrupt handler (registers and stack pointers are saved, there is a context switch, execution can resume in some cases where it left off).

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