什么是操作系统？WHAT IS AN OPERATING SYSTEM?

Posted 2021-11-10 东海陈光剑

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WHAT IS AN OPERATING SYSTEM?

Operating systems turn ugly hardware into beautiful abstractions.

Operating System:

1.A clean abstract set of resources instead of the messy hardware ones and managing these

hardware resources ( … instruction set, memory organization, I/O, and bus structure ).

2.No sane programmer would want to deal with this disk at the hardware level. Instead, a piece of software, called a disk driver, deals with the hardware and provides an interface to read and write disk blocks, without getting into

the details. Operating systems contain many drivers for controlling I/O devices.

But even this level is much too low for most applications. For this reason, all operating systems provide yet another layer of abstraction for using disks: files. Using this abstraction, programs can create, write, and read files, without having to deal with the messy details of how the hardware actually works.

3.This abstraction is the key to managing all this complexity. Good abstractions turn a nearly impossible task into two manageable ones. The first is defining and implementing the abstractions. The second is using these abstractions to solve the problem at hand. One abstraction that almost every computer user understands is the file, as mentioned above.

什么是操作系统？