自考02335《网络操作系统》串讲笔记1（02335 network operating system Chuanjiang notes 1）.docVIP

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自考02335《网络操作系统》串讲笔记1（02335 network operating system Chuanjiang notes 1）.doc

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自考02335《网络操作系统》串讲笔记1（02335 network operating system Chuanjiang notes 1）

自考02335《网络操作系统》串讲笔记1（02335 network operating system Chuanjiang notes 1） Network operating system review information (1) 1. operating system definition: operating system is to control and manage the computer system hardware and software resources, reasonable organization workflow and convenient user program set. The basic features of modern operating system are concurrency, sharing, virtuality and uncertainty. 2. what is the position of the operating system in the computer system? It is the first expansion of the hardware layer, and it is an important part of the software of the computer system. The hierarchical structure of a computer system: the hardware layer, the operating system layer, the language processing layer, and the application layer. The role of the operating system: improve the efficiency of computer systems, enhance the processing capacity of the system, give full play to the utilization of system resources, user-friendly. 3. hardware foundation of multi-channel programming: interrupt system, channel technology, communication between CPU and channel 4.. The basic principle of multiprogramming: the main purpose of multiprogramming is to make full use of all the resources in the system and to make them operate in parallel as much as possible. Using channel technology to liberate CPU from the tedious I/O operation, it can not only realize the parallel work between CPU and channel, but also realize the parallel between channel and channel, each channel and peripheral. The main characteristics of multiprogramming are: multi-channel, macro, parallel, micro, serial. 5. several problems to be solved in multiprogramming: storage, protection, and address relocation. (several programs share the same main memory) the management and scheduling of the processor. (sharing the same processor) management and distribution of resources. (sharing system resources) 6. virtual processor: a logical processor called a virtual processor. Virtual computer: the ability to confi