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
create a flowchart showing average score for the 3 quizzes assume that there are 3 sections each having 5 students the only valid number to be entered is 1-100 for the quizzes shou

hitory and genration of computer

This is an article and I want great synopsis for the article

The internet or the World Wide Web is the most familiar and popular example. These databases hold vast amounts of information, for example, on companies. By obtaining details in t

Question 1 Explain the functional units of a basic computer with a neat diagram Question 2 Explain how you can get 1's complement of a given binary number? Also explain 1'

Conditional statement: An If statement is composed of three parts. The first part should be keyword w.r.t language to convey to the computer that it is if statement. And a Bo

Application-Specific Multiprocessors Although this book details a variety of similar architectures, it specializes in the design of such architectures in the perspective of par

Simple Tasks to Accomplish Once you've worried for why you're performing AI, what has inspired you and how you're going to approach the job, then you can initialize to think for

to do a assignment regarding IPC in linux