5-Operating System Sevices 6-System Calls / OS Relationship 7-OS Design and Implementation 8-Operating System Structure 8-1 Simple Structure 最简单的结构 8-2 More Complex or Non-Simple Structure 更复杂的结构 8-3 Layered Approach 分层方法 8-4 Microkernel Structure 微内核结构 8-5 Modular Approac...
Operating System 操作系统课件 英文版 COP4610OperatingSystems Instructor:DahaiGuoFall,2010Aug.24,2011 Outline •••••Operating-SystemServicesUserOperating-SystemInterfaceSystemCallsSystemProgramsOperating-SystemDesignandImplementation•Operating-SystemStructure•VirtualMachines Operating-SystemServices(1/3...
35、,Simple Structure MS-DOS written to provide the most functionality in the least space Not divided into modules Although MS-DOS has some structure, its interfaces and levels of functionality are not well separated Difficult to implement and maintain.,Layered Approach,The operating system is divid...
The life of the operating system starts with the system boot, typically with a small piece of code (bootstrap loader) stored in ROM or EPROM waking up, fetching a more complex boot loader from disk which in turn loads the operating system kernel from disk. Once the ke...
3.1 Applied Operating System Concepts Module 3: Operating-System Structures 操作系统结构 • System Components系统部件 • Operating System Services操作系统服务 • System Calls系统调用 • System Programs系统程序 • System Structure 系统结构 • Virtual Machines虚拟机 • System Design and Implementa...
Operating-System Structure Simple Structure Everything below the system-call interface and above the physical hardware is the kernel. The kernel provides the file system, CPU scheduling, memory management, and other operating-system functions through system calls. Taken ...
This paper suggests that the structure of an operating system can be clearly expressed as a hierarchy of communicating sequential processes. The suggestion is illustrated by the development of an absurdly simple multiprogrammed batch processing system. It is hoped that the structuring methods and ...
2.7 Operating-System Structure Simple Structure MS-DOS – written to provide the most functionality in the least space Not divided into modules Although MS-DOS has some structure, its interfaces and levels of functionality are not well separated Difficult to implement and maintain. Layered Approach ...
may trigger an interrupt by executing a special operation called a system call 事件通常由中断触发,硬件中断由硬件通过系统总线发信号给CPU触发,软件中断通过执行系统调用触发。 Operating-System Structure One of the most important aspects of operating systems is the ability ...
This simple structure has its inefficiencies. As you can see in Figure 15.2, the relocated process is using physical memory from 32 KB to 48 KB; however, because the process stack and heap are not too big, all of the space between the two is simplywasted, which is calledinternal fragmenta...