what is deadlock ?Differentiate two types of resources ?, Basic Computer Science

• A set of process is in a deadlock state if each process in the group is waiting for an event that can be caused by only another process in the set. In other words, each member of the group of deadlock processes is waiting for a resource that can be released only by a deadlock process. Not any of the processes can run, none of them can release any resources, and not any of them can be awakened. It is significant to note that the number of processes and the number and kind of resources possessed and requested are unimportant.
• The simplest instance of deadlock is where process 1 has been allocated non-shareable resources A, say, a tap drive, and process 2 has be owed non-sharable resource B, say, a printer. At present, if it turns out that process 1 needs resource B (printer) to proceed and process 2 needs resource A (the tape drive) to proceed and these are the only two processes in the system, each one is blocked the other and all valuable work in the system stops. This state is termed deadlock. The system is in deadlock state since each process holds a resource being requested by the other process neither process is willing to release the resource it holds.
• The resources may be either physical or logical. Instances of physical resources are Printers, Tape Drivers, Memory Space, and CPU Cycles. Instances of logical resources are Files, Semaphores, and Monitors.

• Preemptable and Nonpreemptable Resources
Resources come in two types: preemptable and nonpreemptable.
A preemptable resource is one that can be taken away from the process with no ill effects. Memory is an instance of a preemptable resource. Alternatively, a nonpreemptable resource is one that cannot be taken away from process (with no causing ill effect). For instance, CD resources are not preemptable at an arbitrary instant.
Reallocating resources can determine deadlocks that involve preemptable resources. Deadlocks that occupy nonpreemptable resources are hard to deal with.
Posted Date: 5/3/2012 1:18:06 AM | Location : United States







Related Discussions:- what is deadlock ?Differentiate two types of resources ?, Assignment Help, Ask Question on what is deadlock ?Differentiate two types of resources ?, Get Answer, Expert's Help, what is deadlock ?Differentiate two types of resources ? Discussions

Write discussion on what is deadlock ?Differentiate two types of resources ?
Your posts are moderated
Related Questions
Identify three factors to consider in determining the competitive value of information technology. Justify the selected factors. Of the factors selected, determine if each fact


Software: A computer system consists of two parts - hardware and software. The first part, computer hardware, refers to all the visible components of the computer system:  key

#after writing the script of rebuilting indexed on db server it gave output command executed succesfully does this mean i m done

Gareth's Gardens is a small firm that specialises in planning and laying new gardens.  A particularly popular garden plan consists of a patio and lawn, together with a circular pon

Implementing the -Crochemore-Perrin algorithm The software must be functional, code must be clear and including comments and it must have a nice and decent user interface

Previously two sections the fundamentals of the workings and architecture of the central processing unit has been explained. There has been a common look at easy processor architec

QUESTION (a) Using diagrams, describe the 2-tier and 3-tier architectures. (b) What is a middleware? Explain the functions of a middleware. Give two examples of middleware.

Question 1 Define Internet and explain its working Question 2 Explain page format specifiers and page content specifiers of XSL-FO Question 3 Write a note on HTML

what problems does one encounter when you have more pipelines?