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Dining Philosophers Problem
In computer science, the dining philosophers problem is an example problem often used in concurrent algorithm design to illustrate synchronization issues and techniques for resolving them. It was originally formulated in 1965 by Edsger Dijkstra as a student exam exercise, presented in terms of computers competing for access to tape drive peripherals. Soon after, Tony Hoare gave the problem its present form. Problem statement Five philosophers dine together at the same table. Each philosopher has their own plate at the table. There is a fork between each plate. The dish served is a kind of spaghetti which has to be eaten with two forks. Each philosopher can only alternately think and eat. Moreover, a philosopher can only eat their spaghetti when they have both a left and right fork. Thus two forks will only be available when their two nearest neighbors are thinking, not eating. After an individual philosopher finishes eating, they will put down both forks. The problem is how to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dining Philosophers Diagram
A restaurant is an establishment that prepares and serves food and drinks to customers. Meals are generally served and eaten on the premises, but many restaurants also offer take-out and Delivery (commerce), food delivery services. Restaurants vary greatly in appearance and offerings, including a wide variety of cuisines and Customer service, service models ranging from inexpensive fast-food restaurants and cafeterias to mid-priced family restaurants, to high-priced luxury establishments. Etymology The word derives from the early 19th century, taken from the French language, French word 'provide meat for', Literal translation, literally 'restore to a former state' and, being the present participle of the verb, the term ''restaurant'' may have been used in 1507 as a "restorative beverage", and in correspondence in 1521 to mean 'that which restores the strength, a fortifying food or remedy'. History A public eating establishment similar to a restaurant is mentioned in a 512 B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
State Variable
A state variable is one of the set of Variable (mathematics), variables that are used to describe the mathematical "state" of a dynamical system. Intuitively, the state of a system describes enough about the system to determine its future behaviour in the absence of any external forces affecting the system. Models that consist of coupled first-order differential equations are said to be in state-variable form. Examples *In mechanics, mechanical systems, the position coordinates and Velocity, velocities of mechanical parts are typical state variables; knowing these, it is possible to determine the future state of the objects in the system. *In thermodynamics, a state variable is an independent variable of a state function. Examples include internal energy, enthalpy, thermodynamic temperature, temperature, pressure, volume and entropy. Heat and Work (Thermodynamics), work are not state functions, but process functions. *In electronics, electronic/electrical circuits, the voltages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peter H
Peter may refer to: People * List of people named Peter, a list of people and fictional characters with the given name * Peter (given name) ** Saint Peter (died 60s), apostle of Jesus, leader of the early Christian Church * Peter (surname), a surname (including a list of people with the name) Culture * Peter (actor) (born 1952), stage name Shinnosuke Ikehata, a Japanese dancer and actor * Peter (1934 film), ''Peter'' (1934 film), a film directed by Henry Koster * Peter (2021 film), ''Peter'' (2021 film), a Marathi language film * Peter (Fringe episode), "Peter" (''Fringe'' episode), an episode of the television series ''Fringe'' * Peter (novel), ''Peter'' (novel), a 1908 book by Francis Hopkinson Smith * Peter (short story), "Peter" (short story), an 1892 short story by Willa Cather * Peter (album), ''Peter'' (album), a 1972 album by Peter Yarrow * ''Peter'', a 1993 EP by Canadian band Eric's Trip * "Peter", 2024 song by Taylor Swift from ''The Tortured Poets Department, The Tort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
POPL
The annual ACM SIGPLAN- SIGACT Symposium on Principles of Programming Languages (POPL) is an academic conference in the field of computer science, with focus on fundamental principles in the design, definition, analysis, and implementation of programming languages, programming systems, and programming interfaces. The venue is jointly sponsored by two Special Interest Groups of the Association for Computing Machinery: SIGPLAN and SIGACT. POPL ranks as A* (top 4%) in the CORE conference ranking. The proceedings of the conference are hosted at the ACM Digital Library. They were initially under a paywall, but since 2017 they are published in open access as part of the journal ''Proceedings of the ACM on Programming Languages'' (PACMPL). Affiliated events * Declarative Aspects of Multicore Programming Declarative may refer to: * Declarative learning, acquiring information that one can speak about * Declarative memory, one of two types of long term human memory * Declarative p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sleeping Barber Problem
In computer science, the sleeping barber problem is a classic inter-process communication and synchronization problem that illustrates the complexities that arise when there are multiple operating system processes. The problem was originally proposed in 1965 by computer science pioneer Edsger Dijkstra, who used it to make the point that general semaphores are often superfluous. Problem statement Imagine a hypothetical barbershop with one barber, one barber chair, and a waiting room with ''n'' chairs (''n'' may be 0) for waiting customers. The following rules apply: * If there are no customers, the barber falls asleep in the chair * A customer must wake the barber if he is asleep * If a customer arrives while the barber is working, the customer leaves if all chairs are occupied and sits in an empty chair if it's available * When the barber finishes a haircut, he inspects the waiting room to see if there are any waiting customers and falls asleep if there are none There are two m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cigarette Smokers Problem
The cigarette smokers problem is a classic concurrency problem in computer science, introduced by Suhas Patil in 1971. It illustrates synchronization challenges in multi-process systems, where multiple processes (smokers) compete for limited resources (ingredients) provided by a single agent. The problem is notable for its constraints, such as the immutability of the agent's behavior and the prohibition of conditional statements in solutions, which have been subjects of criticism. Problem description Patil's problem includes a "quite arbitrary" "restriction that the process which supplies the ingredients cannot be changed and that no conditional statements may be used." Assume a cigarette requires three ingredients to make and smoke: tobacco, paper, and matches. There are three smokers around a table, each of whom has an infinite supply of ''one'' of the three ingredients — one smoker has an infinite supply of tobacco, another has paper, and the third has matches. Ther ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Directed Acyclic Graph
In mathematics, particularly graph theory, and computer science, a directed acyclic graph (DAG) is a directed graph with no directed cycles. That is, it consists of vertices and edges (also called ''arcs''), with each edge directed from one vertex to another, such that following those directions will never form a closed loop. A directed graph is a DAG if and only if it can be topologically ordered, by arranging the vertices as a linear ordering that is consistent with all edge directions. DAGs have numerous scientific and computational applications, ranging from biology (evolution, family trees, epidemiology) to information science (citation networks) to computation (scheduling). Directed acyclic graphs are also called acyclic directed graphs or acyclic digraphs. Definitions A graph is formed by vertices and by edges connecting pairs of vertices, where the vertices can be any kind of object that is connected in pairs by edges. In the case of a directed graph, each edg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jayadev Misra
Jayadev Misra is an Indian-born computer scientist who has spent most of his professional career in the United States. He is the Schlumberger Centennial Chair Emeritus in computer science and a University Distinguished Teaching Professor Emeritus at the University of Texas at Austin. Professionally he is known for his contributions to the formal aspects of concurrent programming and for jointly spearheading, with Sir Tony Hoare, the project on Verified Software Initiative (VSI). Education and early career Misra received a B.Tech. in electrical engineering from IIT Kanpur, India in 1969 and a Ph.D. in electrical engineering and computer science from the Johns Hopkins University, Baltimore, Maryland in 1972. After a brief period working for IBM, he joined the University of Texas at Austin in 1974 where he has remained throughout his career, except for a sabbatical year spent at Stanford University during 1983–1984. He retired from active teaching in 2015. Major professional c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Stallings
William Stallings is an American author. He has written computer science textbooks on operating systems, computer networks, computer organization, and cryptography. Early life Stallings earned his B.S. in electrical engineering from University of Notre Dame and his PhD in computer science from Massachusetts Institute of Technology The Massachusetts Institute of Technology (MIT) is a Private university, private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of moder .... Career He maintains a website titled Computer Science Student Resource. He has authored 17 titles, and counting revised editions, a total of over 40 books on these subjects. He has been a technical contributor, technical manager, and an executive with several high-technology firms. He works as an independent consultant whose clients have included computer and networking manufacturers and customers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
