操作系统的主要特性（The main features of the operating system）.docVIP

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操作系统的主要特性（The main features of the operating system）.doc

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操作系统的主要特性（The main features of the operating system）

操作系统的主要特性（The main features of the operating system） The main features of the operating system 1, concurrency Concurrency Concurrence) refers to two or more than two events or activities occurring at the same time interval. An operating system is a concurrent system, and concurrency is an important feature of it. Concurrency of an operating system means that it should have The ability to handle and schedule simultaneous execution of multiple programs. Multiple I/O devices are input and output at the same time I/O and CPU The computations are simultaneous; in memory there are multiple systems and user programs that are activated, alternately, and alternately executed, all of which are Is an example of concurrency. Concurrency can eliminate the waiting between components and components in a computer system Effectively improve the utilization of system resources, improve system throughput and improve system efficiency. For example, a program, etc. stay When I/O, sell CPU CPU, while scheduling another program to possess CPU executes the operation. In this way, the program waits I/O When CPU does not idle, this is concurrency. Concurrency can effectively improve the utilization of system resources, but it will lead to a series of problems, so that the operating system System design and implementation become complicated. Such as: how to switch from one running program to another? In what What strategies do you choose for the next running program? How do you isolate the individual programs so that they do not interfere with each other?, From the other sides destruction? How do you enable multiple running programs to communicate messages and collaborate to accomplish tasks? How to coordinate multiple running procedures? Ordering competition for resources? How do you ensure data consistency when multiple running programs share file data? operating system You must have the ability to control and manage concurrent execution. In order to solve these problems better, the operati