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In operating systems or database systems, multiple processes have to access shared resources sequentially. When two or more processes are waiting for accessing shared resources circularly, a deadlock may occur that prevents the progress of all involved processes. One deadlock detection algorithm uses a “wait-for” graph to track all other processes that a process is currently blocking on. In a wait-for graph, processes are represented as nodes, and an edge from process P to Q denotes that P is waiting for a resource Q is holding. Thus a cycle in the wait-for graph shows a possibility of a deadlock.  Design an efficient algorithm (pseudo code) for detecting deadlock. Analyze its complexity.

In operating systems or database systems, multiple processes have to access shared resources sequentially. When two or more processes are waiting for accessing shared resources circularly, a deadlock may occur that prevents the progress of all involved processes. One deadlock detection algorithm uses a “wait-for” graph to track all other processes that a process is currently blocking on. In a wait-for graph, processes are represented as nodes, and an edge from process P to Q denotes that P is waiting for a resource Q is holding. Thus a cycle in the wait-for graph shows a possibility of a deadlock.  Design an efficient algorithm (pseudo code) for detecting deadlock. Analyze its complexity.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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In operating systems or database systems, multiple processes have to access shared resources sequentially. When two or more processes are waiting for accessing shared resources circularly, a deadlock may occur that prevents the progress of all involved processes. One deadlock detection algorithm uses a “wait-for” graph to track all other processes that a process is currently blocking on. In a wait-for graph, processes are represented as nodes, and an edge from process P to Q denotes that P is waiting for a resource Q is holding. Thus a cycle in the wait-for graph shows a possibility of a deadlock. 

  • Design an efficient algorithm (pseudo code) for detecting deadlock.
  • Analyze its complexity.
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