Advanced operating systems lab manual(report) m.tech 1st sem cs vtu

1. Design, develop and execute a program using any thread library to create the number of threads specified by the user; each thread independently generates a random integer as an upper limit, and then computes and prints the number of primes less than or equal to that upper limit along with that upper limit.

INTRODUCTION

         A process defines a Customized Computations framework in which a program executes.  In traditional operating system the basic unit of CPU utilization is a process. Each process has its own program counter, its own register states, its own stack, and its own address space. Now a days, in operating system , the basic unit of CPU utilization is thread and a  process may consist of one or more threads.    

      

PROCESS AND PROCESS CONTROL BLOCK

A process is a program in execution or an instance of a program running on a computer. Two essential elements of process are program code and a set of data associated with that code. At any given point of time while the program is executing, the process can be uniquely characterized by a number of elements including the following,

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Identifier: a unique identifier associated with the process, to distinguish it from all other process.

State: if the process is currently executing it space is in the running state

Priority: priority level relative to other processes.

Program counter: the address of the next instruction in the program to be executed.

Memory pointers: includes pointers to the program court and data associated with the process plus any memory blocks shared with other processes.

Context data: these are the data that are presenting registers in the processor while the process is executing. 

I/O status information: includes outstanding I/O requests, I/O devices’ assigned to the process, list of files in use by process and so on.

Accounting Information: May include the amount of processor time and clock time used, time limits, account numbers and so on.

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