27-letter words containing phi
- dining philosophers problem — (parallel) (DPP) A problem introduced by Dijkstra concerning resource allocation between processes. The DPP is a model and universal method for testing and comparing theories on resource allocation. Dijkstra hoped to use it to help create a layered operating system, by creating a machine which could be consider to be an entirely deterministic automaton. The problem consists of a finite set of processes which share a finite set of resources, each of which can be used by only one process at a time, thus leading to potential deadlock. The DPP visualises this as a number of philosophers sitting round a dining table with a fork between each adjacent pair. Each philosopher may arbitrarily decide to use either the fork to his left or the one to his right but each fork may only be used by one philosopher at a time. Several potential solutions have been considered. Semaphores - a simple, but unfair solution where each resources is a binary semaphore and additional semaphores are used to avoid deadlock and/or starvation. Critical Regions - each processor is protected from interference while it exclusively uses a resource. Monitors - the process waits until all required resources are available then grabs all of them for use. The best solution allows the maximum parallelism for any number of processes (philosophers), by using an array to track the process' current state (i.e. hungry, eating, thinking). This solution maintains an array of semaphores, so hungry philosophers trying to acquire resources can block if the needed forks are busy.
- electroencephalographically — In an electroencephalographic way.
- graphics interchange format — (graphics, file format) /gif/, occasionally /jif/ (GIF, GIF 89A) A standard for digitised images compressed with the LZW algorithm, defined in 1987 by CompuServe (CIS). Graphics Interchange Format and GIF are service marks of CompuServe Incorporated. This only affects use of GIF within Compuserve, and pass-through licensing for software to access them, it doesn't affect anyone else's use of GIF. It followed from a 1994 legal action by Unisys against CIS for violating Unisys's LZW software patent. The CompuServe Vice President has stated that "CompuServe is committed to keeping the GIF 89A specification as an open, fully-supported, non-proprietary specification for the entire on-line community including the web". See also progressive coding, animated GIF.
- polymorphic lambda-calculus — (language, types) (Or "second order typed lambda-calculus", "System F", "Lambda-2"). An extension of typed lambda-calculus allowing functions which take types as parameters. E.g. the polymorphic function "twice" may be written: twice = /\ t . \ (f :: t -> t) . \ (x :: t) . f (f x) (where "/\" is an upper case Greek lambda and "(v :: T)" is usually written as v with subscript T). The parameter t will be bound to the type to which twice is applied, e.g.: twice Int takes and returns a function of type Int -> Int. (Actual type arguments are often written in square brackets [ ]). Function twice itself has a higher type: twice :: Delta t . (t -> t) -> (t -> t) (where Delta is an upper case Greek delta). Thus /\ introduces an object which is a function of a type and Delta introduces a type which is a function of a type. Polymorphic lambda-calculus was invented by Jean-Yves Girard in 1971 and independently by John C. Reynolds in 1974.
- republic of the philippines — a republic in SE Asia, occupying an archipelago of about 7100 islands (including Luzon, Mindanao, Samar, and Negros): became a Spanish colony in 1571 but ceded to the US in 1898 after the Spanish-American War; gained independence in 1946. The islands are generally mountainous and volcanic. Official languages: Filipino, based on Tagalog, and English. Religion: Roman Catholic majority. Currency: peso. Capital: Manila. Pop: 105 720 644 (2013 est). Area: 300 076 sq km (115 860 sq miles)
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