Aug 14, 2024 · How do Multiprogramming Operating Systems Work? In multiprogramming system, multiple programs are to be stored in memory and each program has to be given a specific portion of memory which is known as process. The operating system handles all these process and their states.

Operating System Concepts –9th Edition 3.19 Silberschatz, Galvin and Gagne ©2013 Blocked/Suspend Ready/Suspend: A process in the Blocked/Suspend state is moved to the Ready/Suspend state when the

Figure 4.1 shows the state transition diagram of a process. The process is in the new state when it is being created. Then the process is moved to the ready state, where it waits till it is taken for execution.

INTRODUCTION TO OPERATING SYSTEM: What is an Operating System? Simple Batch Systems, Multiprogramming and Time Sharing systems. Personal Computer Systems, Parallel Systems, Distributed Systems and Real time Systems. Operating System Structures: Operating System Services, System components, Protection system, Operating System Services, system calls

Systems consist of a collection of processes: operating-system processes and user processes. The CPU switch from one to another (multiprogramming) zRecall that only one program active at any instant of time. Operating System Concepts - 7th Edition, Feb 7, 2006 3.4 Silberschatz, Galvin and Gagne ©2005 Process Concept (cont’d)

Operating System Concepts – 9 th Edition 3.4 Silberschatz, Galvin and Gagne ©2013 Process Concept An operating system executes a variety of programs: Batch system – jobs Time-shared systems – user programs or tasks Textbook uses the terms job and process almost interchangeably Process – a program in execution; process execution must

Chap2: Operating-System Structures Objectives: • Services OS provides to users, processes, and other systems • Structuring an operating system • How operating systems are designed and customized and how they boot

State transition diagram with single suspend state Need for suspend states When swapping takes place the OS can decide to get the process from the new state or from suspend state.

Mid-Term Scheduler reduces degree of multiprogramming, and it takes the decision of swapping the process. It swaps out processes that are waiting (need I/O) or low priority processes and swapping in other processes that were in ready queue.