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Topic: Lock (computer science)

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	Lock (computer science) - Wikipedia, the free encyclopedia
		In computer science, a lock is a synchronization mechanism for enforcing limits on access to a resource in an environment where there are many threads of execution.
		Locks are one way of enforcing concurrency control policies.
		Most locking designs block the execution of the process requesting the lock until it is allowed to access the locked resource.
	en.wikipedia.org /wiki/Lock_(software_engineering) (1188 words)

	Science series: Computational biology
		Computer simulation shows how a sodium ion (the small ball near the center) is transported through an ion channel in the wall of a cell.
		Computational biology is one of three areas targeted for development in a $160 million collaborative program between Cornell and its Weill Medical College and Memorial Sloan-Kettering Cancer Center and The Rockefeller University in New York City.
		Computational biologists are looking at every step of this process: at the raw data of the genome, how it's transformed into proteins and how proteins do their work.
	www.news.cornell.edu /Chronicle/00/10.5.00/ss-computational_bio.html (1452 words)

	Computer Science Introduction
		Computer Science is a very young subject, changing rapidly, and drastically changing the way we live.
		The subject of computer science tends to focus on "stored program digital computers" which perform calculations upon number represented as string of digits, where the calculation is under the control of a program stored within the digital memory of the computer.
		Indeed, computers are now part of almost every aspect of modern life, having been adapted to provide flexible and efficient processing for all kinds of information, from bank accounts balances, to the state of automobile engines and brakes, to music and images for entertainment.
	www.bernstein-plus-sons.com /.dowling/Computer_Science_Intro.html (1209 words)

	Encyclopedia :: encyclopedia : Reference (computer science) (Site not responding. Last check: 2007-10-21)
		In computer science, a reference is a small object containing information which refers to data elsewhere, as opposed to containing the data itself.
		It usually represents both the file itself, as when requesting a lock on the file, and a specific position within the file's content, as when reading a file.
		However, to facilitate certain low-level types of programming where necessary, many languages such as ML provide strongly-typed mutable references which can be pointed to different objects over their lifetime.
	www.hallencyclopedia.com /Reference_(computer_science) (1382 words)

	Lock
		An enclosure in a canal used to raise or lower the water level for ships passing through: see canal lock.
		A wrestling hold, such as a head lock.
		In computer science, a bookkeeping object associated with a piece of data used to serialize concurrent access.
	www.ebroadcast.com.au /lookup/encyclopedia/lo/Lock.html (128 words)

	ScienceDaily: "World's Smallest Combination Lock" Promises To Foil The Best Computer Hacker, Say Sandia Developers
		Computer software -- Computer software (or simply software) is that part of a computer system that consists of encoded information (or computer instructions), as opposed to the physical computer equipment (hardware)...
		Computer security -- Computer security is a field of computer science concerned with the control of risks related to computer...
		Computing -- Originally, the word computing was synonymous with counting and calculating, and a science that deals with the original sense of computing mathematical...
	www.sciencedaily.com /releases/1998/10/981013075644.htm (2212 words)

	B.S. in Computer Engineering at MSOE
		The desktop personal computer is a familiar example, but computer systems are also found in consumer appliances, industrial equipment, medical devices, cellular phones, automobiles, avionics, financial trading systems and even "smart" credit cards.
		The computer engineer, with knowledge and experience in both hardware and software, is in a unique position to contribute to the design, implementation, testing, maintenance and application of computer-based systems.
		The computer engineering program at MSOE addresses this need for a balance between hardware and software by integrating "electrical engineering" hardware topics with "computer science" software subjects.
	www.msoe.edu /eecs/ce (539 words)

	UNM Computer Science
		If f is locked by A, and B executes lock(f), B is delayed until A unlocks f.
		Suppose you have a computer with no MMU (no address translation mechanism), that is, there is no mapping register or base register or page table register that is under the control of the operating system (and not the user).
		Unfortunately a computer problem at the phone company causes the messages to be sent randomly to other nodes.
	www.cs.unm.edu /degrees/phd_degrees/comprehensive_examinations/spring_93_systems (1154 words)

	Under Lock & Key
		Leonard M. Adleman, holder of USC’s Henry Salvatori Chair in Computer Science, is a co-winner of the Association for Computing Machinery’s 2002 A. Turing Award.
		Named after computer pioneer Alan Turing, the award is given for contributions to public key cryptography and is considered the most prestigious in computer science.
		Shamir is the Borman Professor in the applied math department of the Weizmann Institute of Science in Israel.
	www.usc.edu /uscnews/stories/8819.html (505 words)

	BGSU Computer Science: Lockers
		The lockers in the basement hallway of Hayes Hall are available for reservation by computer science students.
		All lockers must be emptied and the locks must be removed no later than the end of finals week of the Spring semester.
		If a lock is not removed by this time, the lock will be cut and the locker emptied.
	www.bgsu.edu /departments/compsci/policies/lockers.html (109 words)

	Seminars in Computer Science, University of Liverpool
		Modern DLs are very expressive and have been successfully applied to numerous problems in computer science, such as information integration or metadata management.
		Today's programming abstractions, such as locks, barriers, semaphores and condition variables just don't work for mainstream programmers: they're too difficult to use correctly and produce bugs which are subtle and hard to test for.
		It avoids the programmer needing to think about when to acquire and release locks, it avoids lock-induced deadlock and it avoids the scalability-vs- simplicity tradeoffs that are associated with lock-based design.
	www.csc.liv.ac.uk /research/seminars (511 words)

	Untitled
		Students are introduced to the computing facilities of Lock Haven University and to a variety of applications such as word processing, spreadsheets, file management, the Internet, and Web browsing.
		Introduced are the structure of a "byte" machine, the manipulation of data in various forms, the binary and hexadecimal number systems, operations and scaling, integer arithmetic in binary and packed decimal, various comparison and branching ideas, indexing, input/output, subroutines, and interface with high-level languages.
		Provides a survey of classic and modern computer algorithms, demonstrates techniques to analyze algorithm performance and illustrates the design methodologies used to develop computer algorithms.
	www.lhup.edu /academic/acad_affairs/COMPUTER_SCIENCE.htm (1327 words)

	Computer Science at Rochester
		The Department of Computer Science at the University of Rochester is well known for its research production and collegial atmosphere.
		Particular emphasis is placed on computer vision and robotics, natural language understanding and knowledge representation, systems and architecture, and theory of computation.
		A Girl's Introduction to Computing" An exciting summer course to explore the field of computing for middle school girls.
	www.cs.rochester.edu (497 words)

	Computer Science Department (Site not responding. Last check: 2007-10-21)
		There are 3 computer labs designated for use by Computer Science students.
		Workstations found to be locked more than 15 minutes will be unlocked by system support personnel, resulting in user logoff and possible data corruption/loss.
		The CS department will reserve the right to lock and/or delete any accounts which contain files/scripts/programs that are known to be used for activities including but not exclusive to cracking, spamming and denial of service.
	www.cs.uml.edu /cs_infrastructure/cs_acceptable_user_policy.html (728 words)

	Al-Quds University - Faculty of Science and Technology
		An introduction to the use of the computer for those students in areas where the computer will be useful, tool.
		A survey of the fundamental mechanisms which underlie computer science, including finite state Machines, Turing machines, push-down automata.
		Various advanced topics in computer science such as: graphics, parallel processors, compiler Design and optimization, Robotics communications and signal processing systems, graph theory, Artificial intelligence, Robotics, formal theory, or others.
	www.alquds.edu /faculties/science/?page=cs_bsc (1090 words)

	Computer Science @ PVAMU (Site not responding. Last check: 2007-10-21)
		The Computer Science Department maintains computer labs in SR Collins, rooms 202, 203, 209, 210, 211, 226, and 329 for use by computer science faculty and students enrolled in courses in the department.
		Attempting to write or knowingly propagate computer viruses is prohibited.
		Running programs which lock the keyboard or computer screen is prohibited.
	cs.pvamu.edu /helpdesk (214 words)

	Department of Computer Science - Southeast Missouri State University
		The Computer Science Department operates two computer laboratories, DH 023 and DH 026.
		If a student has trouble gaining access, he or she should come to the office in DH 021 in order to report the difficulty so that the problem can be corrected.
		Students should be aware that most of the instructional software that is used in the Department of Computer Science will also be available in the open laboratories around campus operated by Computer Services.
	www2.semo.edu /csdept/lab.html (171 words)

	Citations: Correction of a Memory Management Method for Lock-Free Data Structures - Michael, Scott (ResearchIndex)
		To overcome the complexity of building linearizable lock free linked lists using CAS, Greenwald suggested a stronger double compare and swap (DCAS) primitive that atomically updates two storage locations after con rming that they both contain required values [Gre99] DCAS is not available on....
		TR 599, Computer Science Department, University of Rochester, 1995.
		TR 599, Computer Science Department, University of Rochester, December 1995.
	citeseer.ist.psu.edu /context/430739/90 (1392 words)

	Debunking the Myth of a Desperate Software Labor Shortage
		But in actually, the ITAA knew that computer science enrollment was skyrocketing, and it deliberately suppressed that fact in its report.
		It is true that a substantial percentage of computer science PhD degrees in the U.S. are awarded to foreign students.
		Word on the computer science academic grapevine following that broadcast was that Katz's colleagues considered his remarks to be ``stupid,'' and it was also pointed out that if older computer scientists can't learn new things, then professors like Katz are incapable of teaching those new things, and should be forced out.
	heather.cs.ucdavis.edu /itaa.real.html (17519 words)

	Spelman Computer Science Department FAQ
		The Computer Science department has no admissions requirement that is separate from admission to Spelman College.
		The Computer Science department, also known as the CIS department (Computer and Information Science), is an academic department.
		The professors in the Computer Science department are generally too busy with teaching and research to help students with their personal computers, or the machines in the PC labs.
	www.spelman.edu /~compsci/FAQ.html (1279 words)

	Computer Laboratory - Practical lock-free data structures
		Through careful design and implementation it's possible to build data structures that are safe for concurrent use without needing to manage locks or block threads.
		Keir Fraser's dissertation, Practical lock freedom, presents a large number of new designs for concurrent data structures such as skip-lists, red-fl trees and binary search trees, including new lock-based designs as well as lock-free versions.
		We will be reporting on these in more detail in a forthcoming paper, but believe that they provide a convenient abstraction for developing lock-free and obstruction-free algorithms and that they admit a variety of software and hardware implementations.
	www.cl.cam.ac.uk /Research/SRG/netos/lock-free (504 words)

	2006 Computer Science Senior Design Projects
		Recent research has indicated that a locked-in market (a market that has conformed to a standard) can inhibit progress.
		By simulating a locked-in market where producers are allowed to make vaporware announcements, we can see how technological progress is affected.
		The problem is that these tools work by simply scanning a computer for files that are on a large list of all known spyware programs.
	cs.union.edu /SeniorProjects (699 words)

	Computer Science 2 (Site not responding. Last check: 2007-10-21)
		The door between X660/X652 is missing a lock cylinder on the X652 side of the door, this means that anyone with access to X652 can access the Imager grad lab.
		The left block is missing a screw and the right block locks like plywood as oppsed to the nice wood that the left on consists of.
		Lock is keyed to open with an 11C-3, not an 11C-4.
	ws.cs.ubc.ca /~cs2/admin/view_reports.php (5526 words)

	Technical Reports :: Princeton Computer Science
		A common operation in multiprocessor programs is acquiring a lock to protect access to shared data.
		Typically, the requesting thread is blocked if the lock it needs is held by another thread.
		Alternatively, the thread could spin until the lock is free, or spin for a while and then block.
	www.cs.princeton.edu /research/techreps/TR-319-91 (267 words)

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