l5 - Process Management Outline of the Lecture What is a...

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1 Process Management Outline of the Lecture What is a process? Why do we need it? States of a process and process transition diagram. Process Control Block (PCB) Process switching/Context switching How to create a process in UNIX? Need of Explicit Multitasking
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2 PROCESS An instance of a program in execution is called a process. A process is an abstraction of the running program. Multiprogramming is essentially multiplexing of system resources- such as processors, memory, I/O devices- among a number of active processes. A process consist of CODE DATA STACK Current value of Program Counter (PC), registers and variables.
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3 Why do we need it? Multiprogramming means ability of concurrent execution of processes but, truly, at any point of time, exactly one process can run as there is exactly one processor. So, CPU switch back and forth from process to process. To start the execution of a program from the point before the switch occurs, the state of the running program must be maintained. So, the
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This note was uploaded on 04/28/2010 for the course CSE cse123 taught by Professor Benny during the Spring '10 term at LSU Eunice.

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l5 - Process Management Outline of the Lecture What is a...

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