Deadlock Detector and Solver Research Paper

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Submitted By bean011
Words 3641
Pages 15
Deadlock Detector and Solver

Abstract

Deadlock is one of the most serious and complex problems concerning the reliability of concurrent Java Programs. This paper presents Deadlock Detector and Solver which detects and resolves circular deadlocks of a java program. An agent written in C++ runs parallel to Java Program and monitors the Java Virtual Machine for deadlocks. If the deadlock is detected, the solver agent is used to resolve the deadlock

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Introduction

The onset of multicore processors forces the programmers to use multiple threads in order to take advantage of hardware parallelism. Java is one of the first languages to make multithreading available to developers. Along with advantages of concurrent systems and multithreading, there are some challenges involved. Java has inter-process communication model which means it has set of methods for exchange of data among multiple threads and processes. It is based on shared data structures and meshes well with hardware architectures in which multiple cores share memory. However Java is susceptible to deadlocks. Deadlock is a condition under which the entire program is halted as each thread in a set attempts to acquire a lock already held by another thread in a set. Java is susceptible to deadlocks because (a) threads exchanges information by sharing variables that they lock with mutex locks and (b) the locking mechanism interacts with other language features, such as aliasing. Consider a simple banking transaction example.

[pic]

Figure 1: Deadlock scenario in banking transaction

.In this case if there are two threads attempting to run transfer(a,b) and transfer(b,a) at the same time then deadlock is going to occur because both threads try to acquire the resources in reverse order. Once a program is deadlocked the source of deadlock is difficult to determine making it difficult to resolve the deadlock.…...

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