Explain process description in the unix system, Operating System

Process Description

A process in UNIX is a somewhat complex set of data structures that provides the operating system with all of the information necessary to dispatch and manage processes. The elements of the process image are categorized into two parts. They are as system context and user level context.

The user level context encloses the fundamental elements of the user's program and can be generated directly from a compiled object file. The user's program is divided into text and data areas. The text area is read-only as well as it is intended to hold the program's instructions. While the process is implementing the processor uses the user stack area for procedure calls and returns and parameter passing. The shared memory area is a data area specifically shared with other processes. There is merely one physical copy of a shared memory area other than, by the utilize of virtual memory it appears to every sharing process memory region is in its address space. When a process isn't running then the processor status information is stored in the register context area.

The system level context encloses the remaining information that the operating system needs to manage the process.

It consists of a static part which is fixed in size and stays with a process throughout its lifetime and a dynamic part which vary through the life of the process. The one element of the static part is the process table entry. This is in fact part of the process table maintained by the operating system with one entry per process. The process table entry table process a control information i.e. accessible to the kernel at all times therefore in a virtual memory system all process table entries are maintained in main memory.

 

 

Posted Date: 6/21/2013 7:32:33 AM | Location : United States







Related Discussions:- Explain process description in the unix system, Assignment Help, Ask Question on Explain process description in the unix system, Get Answer, Expert's Help, Explain process description in the unix system Discussions

Write discussion on Explain process description in the unix system
Your posts are moderated
Related Questions

LRU evicts the page which was last accessed the farthest into the past of any page resident in physical memory, i.e. the least-recently used page. LRU approximates OPT when the rec

What is a process? A process is a program in implementation. It is an active entity and it contains the process stack, having temporary data and the data section includes globa

Relocation bits employed by relocating loader are specified by Relocation bits employed by relocating loader are specified by Assembler or Translator

Which are the different states of a process?   Different status of a process is: New: When the process is created. Running: When instructions are executed. Wait


Define the WindowsNT WindowsNT provides a two-level approach to resource management: process and thread. The process is the uppermost level and contains most of the application

The general idea of a producer-consumer architecture is related to building a pipeline of threads, similar to the web spider from Project 2. Each step of the processing will now be

Which is most common phase structured grammar? Most common phase structured grammar is Context – Sensitive

Page fault is a trap to the software gained by the hardware when a process accesses a page that is goes in the virtual address space, but not added in physical memory. In the har