RABIA ATTACH

  Operating Systems Operating System (OS) is basically a software program that manages and handles all resources of a computer such as hardware and software.  Basic Questions What is an operating system? Answer: An operating system (OS) is system software that manages computer hardware and software resources, providing services for computer programs. What are the main functions of an operating system? Answer: The main functions include resource management, process management, file system management, security and access control, user interface management, and networking. What is a process? Answer: A process is a program in execution, including the program code, current activity, process stack, and data section. What is a thread? Answer: A thread is the smallest unit of a process that can be scheduled for execution, sharing resources like memory with other threads within the same process. What is the difference between a process and a thread? Answer: A process is an independent ...

  Which of the following is an example of a spooled device? a. A line printer used to print the output of a number of jobs. b. The terminal used to enter the input data for a Fortran program being executed. c. The secondary memory device in a virtual memory system. d. The swapping area on a disk used by the swapper. In spooling (Simultaneous Peripheral Operation On Line), a buffer is interposed between a running program and a slow-speed device involved with the program for input/output. For example, instead of writing lines directly to the line printer, the lines are written (temporarily) onto a disk. Thus, the program is allowed to run to completion without waiting for the (slow) printer to finish. When the printer becomes free, the lines can be printed from the disk file. 2. Which of the following is not normally contained in the directory entry of a file? a. Creation date. b. Access control list. c. A count of the number of free blocks in the disk. d. Filename an...