Outl ine What is 0S? 操作系统的定义和目标 Roles of operating system 操作系统的层次模型 History of Operating Systems 操作系统的发展动力 19451955,无操作系统 19551965,批处理系统 19651980,引入分时 1980 present,PC时代，百花齐放 1990 present,移动计算时代 其他操作系统 Personal-Computer Systems Parallel Systems Distributed Systems Embedded System 实验和小结 4口4回，4在4色要刀QC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outline What is OS? 操作系统的定义和目标 Roles of operating system 操作系统的层次模型 History of Operating Systems 操作系统的发展动力 1945~1955, 无操作系统 1955~1965，批处理系统 1965~1980，引入分时 1980~present，PC时代，百花齐放 1990~present，移动计算时代 其他操作系统 Personal-Computer Systems Parallel Systems Distributed Systems Embedded System 实验和小结
What is OS? What is operating system(操作系统，OS)? What operating system do? An operating system acts as an intermediary between the user of a computer and the computer hardware.The purpose of an operating system is to provide an environment in which a user can execute programs in a convenient and efficient manner. An operating system is software that manages the computer hardware. (From 9th edition). 4口4回，4在4色重刀QC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . What is OS? ▶ What is operating system(操作系统, OS)? ▶ What operating system do? An operating system acts as an intermediary between the user of a computer and the computer hardware. The purpose of an operating system is to provide an environment in which a user can execute programs in a convenient and efficient manner. An operating system is software that manages the computer hardware. (From 9th edition)
What is 0S? The role of operating system User view:different user has different opinion. easy of use?performance?resource utilization?battery life? user of pc?mainframe or minicomputer?workstations and servers connected via networks? System view:a resource allocator;a control problem. 4口4包，4在14色，至)QC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . What is OS? ▶ The role of operating system ▶ User view: different user has different opinion. ▶ easy of use? performance? resource utilization? battery life? ▶ user of pc? mainframe or minicomputer? workstations and servers connected via networks? ▶ System view: a resource allocator; a control problem
Outl ine What is 0S? 操作系统的定义和目标 Roles of operating system 標作系统的层次模型 History of Operating Systems 振作系统的发展动力 19451955,无操作系线 19551965.批处理系线 19651980,引入分时 1980 present,PG时代，百花齐放 1990 present,移动计死时代 共他操作系统 Personal-Computer Systems Paral lel Systems Distributed Systems Embedded System 尖验和小结 4口4回，4在4色要刀QC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outline What is OS? 操作系统的定义和目标 Roles of operating system 操作系统的层次模型 History of Operating Systems 操作系统的发展动力 1945~1955, 无操作系统 1955~1965，批处理系统 1965~1980，引入分时 1980~present，PC时代，百花齐放 1990~present，移动计算时代 其他操作系统 Personal-Computer Systems Parallel Systems Distributed Systems Embedded System 实验和小结
Components of Computer System:viewpoint 1 Viewpoint 1:Computer system hardware software (+data) Operating System is the first software layer on the phsical hardwares,and can be viewed as the first expansion of computer hardware system. All applications running in the OSes,more or less, directly or indirectly,call the OS functions.For example,the simplest program“hel lowor Id”. Other programs and users Operating system Hardware 4口4日，4在4生：至)QC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Components of Computer System: viewpoint 1 Viewpoint 1: Computer system = hardware + software (+data) ▶ Operating System is the first software layer on the phsical hardwares, and can be viewed as the first expansion of computer hardware system. ▶ All applications running in the OSes, more or less, directly or indirectly, call the OS functions. For example, the simplest program “helloworld”. Hardware Operating system Other programs and users