In this chapter the aim is to focus on aspects of OS design and implementation which most directly relate to the hardware and software components the OS manages. We concentrate on UNIX-style concepts and approaches, particularly those which can be supported by SPIM, but the discussion is more...
UserOperating-SystemInterface (1/3) •Twoapproachesforuserstointerfacewith theOS: –Commandinterpreter –Graphicaluserinterface •Weareallsofamiliarwith. 不同的机构都有各自的特点,把各种机构按结构加以分类,其目的是按其分类建立运动分析和动力分析的一般方法。
Operating-SystemServices(3/3)•Theservicesforensuringtheefficiencyofthesystemitself –Resourceallocation–Accounting–Protectionandsecurity UserOperating-SystemInterface(1/3)•TwoapproachesforuserstointerfacewiththeOS:–Commandinterpreter–Graphicaluserinterface •Weareallsofamiliarwith.UserOperating-SystemInterface(...
Layered approaches can also be less efficient, as a request for service from a higher layer has to filter through all lower layers before it reaches the HW, possibly with significant processing at each step. 分层方法的主要优点是模块化。分层方法的选择是,每一层都只使用较低层次的功能和服务。这种...
Design and Implementation: The design and implementation of an OS is not “solvable”, but some approaches have proven successful. 操作系统结构 Operating System Structure 构建和启动操作系统: 描述了从编写源代码到启动操作系统的整个过程。 Building and Booting an Operating System: Describes the entire pr...
OperatingSystemServicesUserOperatingSystemInterfaceSystemCallsTypesofSystemCallsSystemProgramsOperatingSystemDesignandImplementationOperatingSystemStructureVirtualMachinesOperatingSystemGenerationSystemBoot 2.3 2.1OperatingSystemServices Onesetofoperating-systemservicesprovidesfunctionsthatarehelpfultotheuser:Userinterface-Almost...
Effectiveness in Synchronization: Semaphores are more effective than other synchronization approaches. By allowing mutual exclusion, they facilitate well-coordinated execution of processes, minimizing the risk of data corruption and race conditions. Efficient Resource Management: Semaphores excel in resource man...
There are two approaches in operating systems' design to deadlock: detection (often left to the operator or user) and prevention, or avoidance. To avoid the situation shown in Fig. 6, it is necessary to ensure that each process in turn is given the resources it needs to execute; once th...
There are three approaches available to communicate with the CPU and Device. Special Instruction I/O Memory-mapped I/O Direct memory access (DMA) Special Instruction I/O This uses CPU instructions that are specifically made for controlling I/O devices. These instructions typically allow data to ...
OperatingSystemServicesUserOperatingSystemInterfaceSystemCallsTypesofSystemCallsSystemProgramsOperatingSystemDesignandImplementationOperatingSystemStructureVirtualMachinesOperatingSystemGenerationSystemBoot 2.3 2.1OperatingSystemServices Onesetofoperating-systemservicesprovidesfunctions...