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diff --git a/doc/2.md b/doc/2.md new file mode 100644 index 0000000..114cd93 --- /dev/null +++ b/doc/2.md @@ -0,0 +1,47 @@ +# Chapter 2: Operating System Structures + +* Chapter 2: 2.1 to 2.5 + +## Operating-System Services + +The OS provides an environment for the execution of programs. +It provides certain services to programs and to the users +of those programs. + +services provided to the user: + +* User Interface: + * command line interface: text commands and a method for entering them. + * batch interface: commands and directives to control those commands are entered into files, and those files are executed. + * graphical user interface: a window system with a pointing device to direct I/O. +* Program execution: Load a program into memory and run that program. +* I/O operations: a running program may require I/O, which may involve a file or an I/O device. +* File-system manipulation: + * read and write files + * create and delete files by name + * search for files + * list file information + * permissions management +* Communication: + * inter process communication + * shared memory + * message passing +* Error detection: + * CPU/Memory hardware + * I/O devices + * user programs + +services for ensuring efficient operation: + +* Resource allocation + * CPU scheduling routines + * allocate printers, modems, USB storage devices +* Accounting + * keep track of which users use how mucn and what kinds of computer resources +* Protection and security + * control access to information + * one process should not be able to interfere with another process. + * access to system resources are controlled + * authentication + +## User Operating-System Interface |