Chapter 2: System Structures
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing l Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them 4 Many types of resources - Some (such as CPU cycles, main ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing l Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them 4 Many types of resources - Some (such as CPU cycles, main ...
Operating Systems - The College of Saint Rose
... Dual-mode operation provides a user mode and a kernel mode of operation ...
... Dual-mode operation provides a user mode and a kernel mode of operation ...
Module 3: Operating
... users or multiple jobs running at the same time. Accounting – keeping track of and recording how much and what kinds of computer resources a user uses for account billing or for accumulating usage statistics. Protection – ensuring that all access to system resources is controlled. ...
... users or multiple jobs running at the same time. Accounting – keeping track of and recording how much and what kinds of computer resources a user uses for account billing or for accumulating usage statistics. Protection – ensuring that all access to system resources is controlled. ...
Slide 1
... • Operator would combine multiple jobs into a single batch job and load into card/tape reader • Each user job would be executed in turn • Users received output after all jobs finished the primitive operating system in charge of executing the batch job was called a resident monitor it resided permane ...
... • Operator would combine multiple jobs into a single batch job and load into card/tape reader • Each user job would be executed in turn • Users received output after all jobs finished the primitive operating system in charge of executing the batch job was called a resident monitor it resided permane ...
pdf
... Consider the various definitions of operating system. Next, consider whether the operating system should include applications such as Web browsers and mail programs. Argue both that it should and that it should not, and support your answers. Answer: Point. Applications such as web browsers and email ...
... Consider the various definitions of operating system. Next, consider whether the operating system should include applications such as Web browsers and mail programs. Argue both that it should and that it should not, and support your answers. Answer: Point. Applications such as web browsers and email ...
Slides 2 - USC Upstate: Faculty
... Q: Why use APIs rather than system calls? • Answer: – Convenience: system calls are more difficult to work with than the API » Most programming languages provide a system call interface. The application programmers need to know nothing about how the system call is implemented or what it does during ...
... Q: Why use APIs rather than system calls? • Answer: – Convenience: system calls are more difficult to work with than the API » Most programming languages provide a system call interface. The application programmers need to know nothing about how the system call is implemented or what it does during ...
os_ch1-2008
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
... which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If ...
CS4023_-_lecture_05_-_0910
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
390aLecture01_15sp
... courses that CSE majors should know CSE 351 may be the first course you take that uses Linux Course Topics: Linix command line interface (CLI), Shell scripting, compilation tools (makefiles), version control… Credit / No Credit course, determined by short weekly assignments and a “final” assig ...
... courses that CSE majors should know CSE 351 may be the first course you take that uses Linux Course Topics: Linix command line interface (CLI), Shell scripting, compilation tools (makefiles), version control… Credit / No Credit course, determined by short weekly assignments and a “final” assig ...
390aLecture01_15au
... courses that CSE majors should know CSE 351 may be the first course you take that uses Linux Course Topics: Linix command line interface (CLI), Shell scripting, compilation tools (makefiles), version control… Credit / No Credit course, determined by short weekly assignments and a “final” assig ...
... courses that CSE majors should know CSE 351 may be the first course you take that uses Linux Course Topics: Linix command line interface (CLI), Shell scripting, compilation tools (makefiles), version control… Credit / No Credit course, determined by short weekly assignments and a “final” assig ...
Module 3: Operating
... • The program that reads and interprets control statements is called variously: – control-card interpreter – command-line interpreter – shell (in UNIX) Its function is to get and execute the next command statement. Operating System Services • Program execution – system capability to load a program i ...
... • The program that reads and interprets control statements is called variously: – control-card interpreter – command-line interpreter – shell (in UNIX) Its function is to get and execute the next command statement. Operating System Services • Program execution – system capability to load a program i ...
Operating Systems - Cardiff University
... – CPU operations take less time than I/O – When a process waits for I/O operation, OS swaps to another process. ...
... – CPU operations take less time than I/O – When a process waits for I/O operation, OS swaps to another process. ...
Document
... This means that you can work on all files of a particular type • For example, suppose that you wished to find all word files. These have the extension DOC, so you would use specify *.DOC as the filename. The * is a wildcard. ...
... This means that you can work on all files of a particular type • For example, suppose that you wished to find all word files. These have the extension DOC, so you would use specify *.DOC as the filename. The * is a wildcard. ...
Operating System Structures
... action to ensure correct and consistent computing − Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
... action to ensure correct and consistent computing − Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
PPT
... OS has its code in memory and so does each runnable user process Would we want a process to store random data into the OS’s code or data segments? What about into another processes code or data segments? ...
... OS has its code in memory and so does each runnable user process Would we want a process to store random data into the OS’s code or data segments? What about into another processes code or data segments? ...
10-Software-Presentation
... peripherals attached to it The functions of an OS are: Provide a Human Computer Interface Handle Input and Output ...
... peripherals attached to it The functions of an OS are: Provide a Human Computer Interface Handle Input and Output ...
System software - Information Technology
... muliprogrammed computer must be the same as if the program was the only program running on the computer • Programs must not be able to aces other program’s data and must be confident that their data will not be modified by other programs. • Programs must not interfere with other program’s use of I/O ...
... muliprogrammed computer must be the same as if the program was the only program running on the computer • Programs must not be able to aces other program’s data and must be confident that their data will not be modified by other programs. • Programs must not interfere with other program’s use of I/O ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.