The majority of processors produced nowadays are targeted at dedicated computing systems that execute either a single application or a small set of previously known applications. In contrast to generic computing systems, these dedicated systems have very specific run-time support requirements, which are not properly fulfilled by general-purpose operating systems. The impossibility to anticipate...

A customizable operating system is one that can adapt to improve its functionality or performance. The need for customizable and application-speciic operating systems has been recognized for many years, but they have yet to appear in the commercial market. This paper explores the notion of operating system customizability and examines the limits of existing approaches. The paper begins by surve...

ions A process is essentially an abstraction of a computer. This is one of the major abstractions provided by multiprogrammed operating systems. It provides the operating environment for applications, which is based on the hardware, but with some changes such as lack of access to privileged instructions. But the important point is the isolation from other applications, running as other processe...

Parallel operating systems are the interface between parallel comput

Since the discovery of the reference monitor concept during the development of Multics, there have been many projects to retrofit existing commercial operating systems with a true reference monitor implementation. Successful, commercial operating systems can have a large customer base and a variety of popular applications. As a result, those customers with strong secrecy and integrity requireme...

The intention of this writing is to introduce the reader to problems, requirements and design issues of distributed operating systems. After introducing the main motivations, which lead to distributed operating systems and defining what is meant by a distributed operating systems, this paper takes a deeper look into what transparency, reliability, flexibility and performance of those systems im...

Consider a flight with 10 seats and a number of travel agents each trying to book two seats on the flight. 1) Write a class Flight with to integer value attribute for total number of seats and number of booked seats (make them static to simplify) 2) Write a class TravelAgent which is implemeted as a thread. TravelAgent checks if there are two seats available and books them. 3) In Flight, create...

Security of computing systems is a vital topic whose importance only keeps increasing. Much money has been lost and many people’s lives have been harmed when computer security has failed. Attacks on computer systems are so common as to be inevitable in almost any scenario where you perform computing. Generally, all elements of a computer system can be subject to attack, and flaws in any of them...

This instantly raises a question: what do we mean by performance? Most of us have an informal sense of what we mean. Perhaps we mean we don’t want to wait for our commands to complete. Perhaps we mean we want to run complex calculations on very large data sets fast enough for the results to be useful. Perhaps we mean we want to get the most possible work through a given piece of hardware that w...