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Variable used in a concurrent system
In computer science, a semaphore is a synchronization device used to control access to a common resource by multiple threads or processes in a concurrent
Semaphore_(programming)
Computer data variable
register (computing) Program status word Semaphore (programming) Status register Haigh, J. (1994). Designing Computer Programs. Elsevier Science. p. 59
Flag_(programming)
Mechanical apparatus used to send messages
Semaphore (lit. 'apparatus for signalling'; from Ancient Greek σῆμα (sêma) 'mark, sign, token' and Greek -φόρος (-phóros) 'bearer, carrier') is the use
Semaphore
Topics referred to by the same term
1920s to 1950s Semaphore (programming), in computer science, a mechanism for supporting mutual exclusion in concurrent programs Semaphore (software), a
Semaphore_(disambiguation)
Overview of and topical guide to algorithms
Lamport timestamp Leader election Gossip protocol Mutual exclusion Semaphore (programming) Monitor (synchronization) Deadlock prevention algorithms Lock-free
Outline_of_algorithms
Concurrent programming algorithm for mutual exclusion
algorithm Eisenberg & McGuire algorithm Lamport's bakery algorithm Semaphore (programming) Szymański's algorithm G. L. Peterson: "Myths About the Mutual Exclusion
Peterson's_algorithm
Concurrent Programming: From Semaphores to Remote Procedure Calls. (Springer)., p. 8 Dijkstra, E. W. (1965). "Solution of a problem in concurrent programming control"
List of Dutch inventions and innovations
List_of_Dutch_inventions_and_innovations
Topics referred to by the same term
development process V, a historical name for the "signal" operation on a semaphore (programming) ∨, descending wedge ∨, logical disjunction Von Neumann universe
V_(disambiguation)
Language for controlling a computer
programming, assembly languages (or second-generation programming languages—2GLs) were invented, diverging from the machine language to make programs
Programming_language
Topics referred to by the same term
mineral Page view, a metric in web analytics Semaphore (programming), from P and V operations in semaphores restricting processes in a shared environment
PV
Synchronization primitive in computing
kernel implements a special solution for few writers called seqlock. Semaphore (programming) Mutual exclusion Scheduler pattern Balking pattern File locking
Readers–writer_lock
Linux kernel APIs and ABIs
Linux Programming Interface – Book by Michael Kerrisk netlink – Linux kernel interface for inter-process communication between processes Semaphore (programming) –
Linux_kernel_interfaces
Object or module in concurrent programming
sequential processes - a later development of monitors by C. A. R. Hoare Semaphore (programming) Brinch Hansen, Per (1973). "7.2 Class Concept" (PDF). Operating
Monitor_(synchronization)
Key-value database management system
Flat-file database ISAM Key–value database Mobile database NoSQL Semaphore (programming) Kew 2007, p. 80: "DBMs have been with us since the early days of
DBM_(computing)
algorithms, Dijkstra's algorithm, Go To Statement Considered Harmful, semaphore (programming), IFIP WG 2.1 member Matthew Dillon – DragonFly BSD with LWKT, vkernel
List_of_computer_scientists
Programming language
and procedural programming language, designed by Niklaus Wirth as a small, efficient language intended to encourage good programming practices using
Pascal_(programming_language)
Problem used to illustrate synchronization issues and techniques for resolving them
std::binary_semaphore both_forks_available[N] { std::binary_semaphore{0}, std::binary_semaphore{0}, std::binary_semaphore{0}, std::binary_semaphore{0},
Dining_philosophers_problem
Measures to ensure concurrent computing operations generate correct results
thread at a time Search engine indexing – Method for data management Semaphore (programming) – Variable used in a concurrent system Software transactional memory –
Concurrency_control
Family of computing problems
was controlled by two counting semaphores in what we now know as the producer/consumer arrangement: the one semaphore indicating the length of the queue
Producer–consumer_problem
Abstraction of parallel computer architecture
compiled programs can execute. The implementation of a parallel programming model can take the form of a library invoked from a programming language,
Parallel_programming_model
Named container for a particular type of data
variables in APL. Computer programming portal Attribute (object-oriented programming) Class (programming) Control variable (programming) Dynamic variable Expression
Variable (high-level programming language)
Variable_(high-level_programming_language)
SR (short for Synchronizing Resources) is a programming language designed for concurrent programming. Resources encapsulate processes and the variables
SR_(programming_language)
language – SCSI – Second-generation programming language – Secure Sockets Layer – sed – Self (or SELF) – Semaphore (programming) – Sequential access – Serverless
Index_of_computing_articles
C language standard library specifically for POSIX systems
rather than <regex.h>, <thread> rather than <pthread.h>, or <semaphore> rather than <semaphore.h>. POSIX C standard library C++ standard library Windows
C_POSIX_library
Programming paradigm in which many processes are executed simultaneously
internals – the semaphore". Embedded. AspenCore. Retrieved 2018-05-10. Preshing, Jeff (2012-06-08). "An Introduction to Lock-Free Programming". Preshing on
Parallel_computing
Executing several computations during overlapping time periods
concurrent programming usually needs the use of some form of locking (e.g., mutexes, semaphores, or monitors) to coordinate between threads. A program that
Concurrent_computing
Dutch computer scientist (1930–2002)
research in basic software theory, algorithm theory, structured programming, and semaphores." Dijkstra was alive to receive notice of the award, but it was
Edsger_W._Dijkstra
Model of concurrent computation
2021-08-25. Hansen, Per Brinch (2002). The Origins of Concurrent Programming: From Semaphores to Remote Procedure Calls. Springer. ISBN 978-0-387-95401-1.
Actor_model
Computing state associated with a point in time
event+critical section. Callback (computer programming) Database trigger DOM events Event-driven programming Exception handling Interrupt handler Interrupts
Event_(computing)
Reusable solution template to a commonly-needed software behavior
Repository Programming idiom Refactoring Software development methodology Alexandrescu, Andrei (2001). Modern C++ Design: Generic Programming and Design
Software_design_pattern
System-design platform and development environment
distributed by National Instruments, based on a programming environment that uses a visual programming language. It is widely used for data acquisition
LabVIEW
Global system of connected computer networks
through the network, in order to examine their contents using other programs. Other programs are needed to perform traffic analysis and sift through intercepted
Internet
In computing, restricting data to be accessible by one thread at a time
Atomicity (programming) Concurrency control Dining philosophers problem Exclusive or Mutually exclusive events Reentrant mutex Semaphore Spinlock
Mutual_exclusion
Component of a computer process
APIs include condition variables, critical sections, semaphores, and monitors. A popular programming pattern involving threads is that of thread pools where
Thread_(computing)
Danish-American computer scientist
retrospective on the evolution of concurrent programming, The Origin of Concurrent Programming: From Semaphores to Remote Procedure Calls (2002). He self-published
Per_Brinch_Hansen
System of rules to convert information into another form or representation
difficult or impossible. For example, semaphore, where the configuration of flags held by a signaler or the arms of a semaphore tower encodes parts of the message
Code
Functions whose execution can be paused
whatsoever), there is no need for synchronization primitives such as mutexes, semaphores, etc. in order to guard critical sections, and there is no need for support
Coroutine
Programming language
68C C (programming language) C++ Bourne shell Bash (Unix shell) Steelman language requirements Ada (programming language) Python (programming language)
ALGOL_68
Concept in computer science, referring to processes, or data
chooses to wait. Some semaphores would allow only one thread or process in the code section. Such Semaphores are called binary semaphore and are very similar
Synchronization (computer science)
Synchronization_(computer_science)
Genus of grasses
Arctic and North American plants in the grass family known generally as semaphore grass. Pleuropogon native primarily to North America, with one species
Pleuropogon
Execution model which allows for parallel computing
model that exists independently from a programming language, as well as a parallel execution model. It allows a program to control multiple different flows
Pthreads
American software company (1982–2017)
Semaphore Corporation was a company notable for being the first to provide public access to selected U.S. Postal Service databases, and for its early
Semaphore_Corporation
Protected section of code that cannot be executed by more than one process at a time
concurrent programming, concurrent accesses to shared resources can lead to unexpected or erroneous behavior. Thus, the parts of the program where the
Critical_section
Open-source software platform for remote configuring and managing computers
via GitHub. Semaphore community. "Semaphore API". ansible-semaphore.com. p. 1. Retrieved Sep 19, 2023. Semaphore community. "ansible-semaphore". github
Ansible_(software)
New Zealand post-rock band
Kingdom. They were well received at every venue, and released a 7" single, Semaphore, in Europe. Also that year, they released the one-track mini-album Dominion
Jakob_(band)
Computer science problem in concurrency
resource // all semaphores initialised to 1 semaphore resource; // controls access (read/write) to the resource. Binary semaphore. semaphore rmutex; // for
Readers–writers_problem
Telecommunications network for TV programming
operation provides programming to many television stations, pay television providers or, in the United States, multichannel video programming distributors.
Television_broadcaster
Synchronization mechanism for enforcing limits on access to a resource
attempting to make the access. The simplest type of lock is a binary semaphore. It provides exclusive access to the locked data. Other schemes also provide
Lock_(computer_science)
Media and technology entrepreneur
subsidiary BMG Music While helping form BMG Ventures, he began working with Semaphore Entertainment Group, a joint venture subsidiary focused on pay-per-view
David_Isaacs_(businessman)
Operating system
various RTOS services can be called from there (e.g. a time delay or a semaphore). When you use a framework, you reuse the overall architecture (such as
QP_(framework)
Sharing of data between running processes in a computer system
between a main and a renderer process Computer programming portal Berkeley sockets Computer network programming Communicating Sequential Processes (CSP paradigm)
Inter-process_communication
Linked hypertext system on the Internet
like Finjan Holdings have recommended active real-time inspection of programming code and all content regardless of its source. Some have argued that
World_Wide_Web
Open standard for programming heterogenous computing systems, such as CPUs or GPUs
(based on C99) for programming these devices and application programming interfaces (APIs) to control the platform and execute programs on the compute devices
OpenCL
Maritime communication method
matters. Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most
International_Code_of_Signals
Library for Rust programming language
Computer programming portal Free and open-source software portal Tokio is a software library for the Rust programming language. It provides a runtime and
Tokio_(software)
specifications Rosetta Stone For *Nix – configurable list of equivalent programs for *nix systems. The Unix Acronym List: Unix Commands – explains the names
List_of_POSIX_commands
networks, which allow distribution of programming over a wide geographic area. Video recording methods allow programming to be edited and replayed for later
History_of_television
Television content transmitted via signals on coaxial or fibre-optic cable
the programming from a nearby affiliate but fill in with its own news and other community programming to suit its own locale. Many live local programs with
Cable_television
Topics referred to by the same term
operation to acquire a semaphore <p>...</p>, the HTML element used to create a paragraph P-type semiconductor P (programming language), developed by
P_(disambiguation)
privileges, and, in some cases, a particular application. binary semaphore: See semaphore. booting: In computing, booting (also known as booting up) is the
Glossary of operating systems terms
Glossary_of_operating_systems_terms
Software concurrency problem
science pioneer Edsger Dijkstra, who used it to make the point that general semaphores are often superfluous. Imagine a hypothetical barbershop with one barber
Sleeping_barber_problem
drums in Africa, Asia, and the Americas. In the 1790s, the first fixed semaphore systems emerged in Europe. However, it was not until the 1830s that electrical
History_of_telecommunication
American sports and entertainment promoter
Ultimate Fighting Championship (UFC), initially under the ownership of the Semaphore Entertainment Group, was founded by American businessman Art Davie and
TKO_Group_Holdings
Topics referred to by the same term
theory, in evolutionary biology Time signal SIGNAL (programming language), a synchronous programming language Signal (IPC), a form of inter-process communication
Signal_(disambiguation)
System for exchanging messages between computing systems
technical standard. A programming language describes the same for computations, so there is a close analogy between protocols and programming languages: protocols
Communication_protocol
Computer operating system for applications with critical timing constraints
crisp than semaphore systems, simple message-based systems avoid most protocol deadlock hazards, and are generally better-behaved than semaphore systems
Real-time_operating_system
Seventeenth letter of the Latin alphabet
idiom about minding manners Q factor – Resonator damping parameter Q# – Programming language for quantum algorithms QAnon – American conspiracy theory and
Q
First implementation of paged virtual memory
and nearly all the ALGOL 60 compiler. In this system, semaphores were used as a programming construct for the first time. The design of the THE multiprogramming
THE_multiprogramming_system
Platform for users to upload, share, or live stream videos on the Internet
specialized third-party service providers, using what they call an application programming interface (API). These include cloud transcoders, recommendation engines
Online_video_platform
System V IPC kernel entities are: Shared memory segments Message queues Semaphore arrays On Linux, the ipcs command is provided by the util-linux package
Ipcs
Early packet switching network (1969–1990)
resource sharing between remote computers. Taylor appointed Larry Roberts as program manager. Roberts made the key decisions about the request for proposal
ARPANET
Twenty-sixth letter of the Latin alphabet
physics, Z denotes the atomic number and Z0 denotes a Z boson. In computer programming, Z is the abbreviation for the zero flag. In Japan, the Z flag is a symbol
Z
Core of a computer operating system
point of view, atomic lock and unlock operations operating on binary semaphores are sufficient primitives to express any functionality of process cooperation
Kernel_(operating_system)
American businessman (born 1969)
manager for Ortiz and Liddell, White met Bob Meyrowitz, the owner of Semaphore Entertainment Group, the then-parent company of the Ultimate Fighting
Dana_White
Twenty-fourth letter of the Latin alphabet
subtitles and captions, serving the same role as an asterisk (*). In the C programming language, "x" preceded by zero (as in 0x or 0X) is used to denote hexadecimal
X
American actress and comedian (born 1986)
Bouche. While a student at UVA, she participated in the Disney College Program for one semester, working as a character friend to Buzz Lightyear. Zamata
Sasheer_Zamata
"Joyce: A programming language for distributed systems". In Hansen, Per Brinch (ed.). The Origin of Concurrent Programming: From Semaphores to Remote
Joyce_(programming_language)
1966 novel by Thomas Pynchon
Jose Semaphore | Adobe". www.adobe.com. Retrieved February 16, 2025. Snesrud, Mark; Mayo, Bob (August 20, 2007). "Decoding the San Jose Semaphore" (PDF)
The_Crying_of_Lot_49
Side Includes or CGI instead of a web application written in a dynamic programming language; HTML 3.2-era structures such as frames and tables to create
History_of_the_Internet
System for inter-process communication
in computer programs Methods File Memory-mapped file Message passing Message queue and mailbox Named pipe Anonymous pipe Pipe Semaphore Shared memory
OpenBinder
Signaling device to control competing flows of traffic
invented by John Peake Knight. A police constable raised or lowered the semaphore arms and, at night, operated a lever to control the lights which drivers
Traffic_light
Programming language library
concurrency and synchronizing abstractions such as unbounded channels, semaphores and sample variables. Haskell threads have very low overhead: creating
Concurrent_Haskell
installed, original sidelights, taillights, front and rear indicators and semaphore indicators installed, full respray from dark green to original gray performed
List of Wheeler Dealers episodes
List_of_Wheeler_Dealers_episodes
Family of IEEE standards for compatibility between operating systems
library) includes: Priority Scheduling Real-Time Signals Clocks and Timers Semaphores Message Passing Shared Memory Asynchronous and Synchronous I/O Memory
POSIX
In computing, a conflict over access to a shared resource
Various low-level mechanisms can be used to aid this, including locks, semaphores, mutexes and queues. The other techniques that can be applied by the operating
Resource_contention
Research and scientific development company
device (CCD), information theory, the Unix operating system, and the programming languages B, C, C++, S, SNOBOL, AWK, AMPL, and others, throughout the
Bell_Labs
Proposal to carry IP traffic by birds
homing pigeons to carry messages Semaphore Flag Signaling System – Joke proposal to carry internet protocol by Semaphores Sneakernet – Informal term for
IP_over_Avian_Carriers
Act of typing and sending a brief, digital message
use of encrypted text messages. In 2003, a British company developed a program called Fortress SMS which used 128 bit AES encryption to protect SMS messages
Text_messaging
Patrol boat class of the Royal Australian Navy
88 Patrol Boats (Royal Australian Navy) Semaphore 17, 2005, para. 7 Semaphore 17, 2005, para. 6 Semaphore 17, 2005, para. 8 Navy League of Australia
Fremantle-class_patrol_boat
Comprehensive outline of core abstractions in the field of computer science
relatable concepts. General programming abstractions are foundational concepts that underlie virtually all of the programming tasks that software developers
List of abstractions (computer science)
List_of_abstractions_(computer_science)
Range of mainframe computers in the 1960s and 70s
(Executive Systems Programming Oriented Language). This superset of ALGOL 60, provided abilities of what would later be termed a system programming language or
Burroughs_Large_Systems
Family of wireless network protocols
are actively transmitting. As with other IEEE 802 LANs, stations come programmed with a globally unique 48-bit MAC address. The MAC addresses are used
Wi-Fi
Handheld mobile device
high levels of control over the mobile device. A mobile app is a computer program designed to run on a mobile device, such as a smartphone. The term "app"
Smartphone
American mathematician (1916–2001)
considered to be the discipline's founding event, and papers on the programming of chess computers. His Theseus machine was the first electrical device
Claude_Shannon
Organization that transmits content over a television channel
station, with only small regional changes in programming, such as local television news. To broadcast its programs, a television station requires operators
Television_station
Novelty form of variant English spelling
number. Sometimes the prefix or suffix is used as part of the word. The C programming language uses the "0x" prefix to indicate a hexadecimal number, but the
Hexspeak
Warship that serves as a seagoing airbase
Professional Notes P.125 "AWD, Hobart, MFU or DDGH – What's in a Name?". Semaphore. Royal Australian Navy. 30 July 2010. Archived from the original on 26
Aircraft_carrier
Fictional organization from Terry Pratchett's Discworld novel series
parallel to the British "Bobbies." They maintain contact through the semaphore telegraph system known as the clacks, a satirical reference to international
Ankh-Morpork_City_Watch
2020 edition of the C++ programming language standard
C++20 is a version of the ISO/IEC 14882 standard for the C++ programming language. C++20 replaced the prior version of the C++ standard, called C++17
C++20
are: Shared memory (interprocess communication) segments Message queues Semaphore arrays On Linux, the ipcrm command is provided by the util-linux package
Ipcrm
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