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Software design pattern
In software engineering, double-checked locking (also known as "double-checked locking optimization") is a software design pattern used to reduce the
Double-checked_locking
Synchronization mechanism for enforcing limits on access to a resource
section Double-checked locking File locking Lock-free and wait-free algorithms Monitor (synchronization) Mutual exclusion Read/write lock pattern "lock Statement
Lock_(computer_science)
Keyword used in some programming languages to tag variables
useful multi-threading construct in Java. In particular, the typical double-checked locking algorithm with volatile works correctly in Java. Before Java version
Volatile (computer programming)
Volatile_(computer_programming)
Lazy-loaded singleton
html http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html The double checked locking idiom does not work correctly in Java versions prior
Initialization-on-demand holder idiom
Initialization-on-demand_holder_idiom
Topics referred to by the same term
simultaneously Double Check, a sculpture by John Seward Johnson II Double Check (novel), a novel in the Traces series Double-checked locking, a software
Double_check_(disambiguation)
Programming technique to restrict a class to a single instance
is a thread-safe implementation, using lazy initialization with double-checked locking. public class Singleton { private static volatile Singleton instance
Singleton_pattern
Delay of a task until it is first needed
associated with a certain * type. Instantiates new ones as needed. Uses double-checked locking * pattern for using in highly concurrent environments. * @param
Lazy_initialization
Software design pattern
Balking pattern Barrier Double-checked locking Guarded suspension Monitor object Nuclear reaction Reactor pattern Readers–writer lock Scheduler pattern Thread
Concurrency_pattern
Computer synchronizing instruction
example (a non-trivial one that arises in actual practice), see double-checked locking. In the case of the PowerPC processor, the eieio ("Enforce In-order
Memory_barrier
Data structure for reusing strings
string creation (where the intern pool must be checked and modified if necessary), and double-checked locking may be used on platforms where this is a safe
String_interning
Reusable solution template to a commonly-needed software behavior
neural network. No —N/a Double-checked locking Reduce the overhead of acquiring a lock by first testing the locking criterion (the 'lock hint') in an unsafe
Software_design_pattern
Topics referred to by the same term
operating systems from the former Digital Equipment Corporation (DEC) Double-checked locking, a software design pattern .dcl, source code files for Clean (programming
DCL
Dance steps in which the standing foot blocks the moving foot
Lock step refers to any of several dance steps that involves the "locking" of the moving foot: the moving foot approaches to the standing foot, crosses
Lock_step_(dance_move)
All Elite Wrestling pay-per-view and livestreaming event
ankle lock again. O'Reilly taps out and Moxley retains the Continental title. Following the match, O'Reilly's Conglomeration teammates checked on him
Double_or_Nothing_(2026)
Musical term
phenomenon called mode-locking counteracts the natural inharmonicity of the string or air column and causes the overtones to lock precisely onto integer
Inharmonicity
Revolver
open iron sighted 6 inch barrel and was marketed from 1910 to 1925, with checked Walnut grips replacing the rubber ones after 1923. A Second issue was sold
Colt_Police_Positive
Unsolved 1946 serial murders in Texarkana, United States
murders alarmed residents into taking precautions with security: from locking doors to arming themselves with guns; some people nailed sheets over their
Texarkana_Moonlight_Murders
British murderer (born 1956)
taxi driver, but then attacked another woman who was a passenger after locking the car's doors; she managed to escape by smashing the windscreen. For
David_Smith_(murderer)
Unidentified woman found dead in Oslo Plaza in 1995
using the alias Jennifer Fairgate (and misspelt as Jennifier Fergate) checked into Oslo's Plaza Hotel (now the Radisson Blu Plaza). Seventy hours later
Jennifer_Fairgate_case
Versatile folding multi-tool knife
in the green Polyamide 6 grip shells and a double liner locking system, one-hand 86 mm (3.4 in) long locking partly wavy serrated chisel ground (optimized
Swiss_Army_knife
Set of rules defining correctly structured programs for the C# programming language
abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally
C_Sharp_syntax
Revolver
revolver is double-action only because of the absence of a cocking spur, intended to avoid snagging on clothing and firing accidentally. The lock was self-cocking
Type_26_revolver
WWE livestreaming event and television special
him in the injured eye; Naraku proceeded to his injured eye. The referee checked D'Angelo's condition, contemplating whether to stop the match, but D'Angelo
NXT The Great American Bash (2026)
NXT_The_Great_American_Bash_(2026)
Han dynasty concubine (c.224 – 194 BC)
King of Zhao (Liu Ruyi, King Yin of Zhao) by his side in the palace and checked for poison in any aliment delivered to him. Emperor Xiaohui also brought
Consort_Qi_(Han_dynasty)
the Sox in knots the entire game—or else they wouldn't have had as many checked swings as they did. Or as many strikes that they tried to sell to the umpires
Glossary_of_baseball_terms
Dance step
reverse turn Basic reverse turn Checked reverse turn Reverse corte Reverse pivot Fallaway reverse Reverse wave Double reverse spin Quick open reverse
Natural_and_reverse_turns
German football manager (born 1973)
offside on an equaliser from Matthijs de Ligt, with the decision then not checked by video assistant referee (VAR). Tuchel labelled it as "against the rules"
Thomas_Tuchel
Motor vehicle
hydraulically locking differential which activates automatically when required. The electronic control allows varied amounts of differential lock from the
Mercedes-Benz_W201
American comedy-drama television series
laptop. Benjamin asks Jim Jones to put Cassie's file back and erase that he checked it out. Cassie storms out of flight attendant training and goes to Grace's
The_Flight_Attendant
Class of electric train operating in Sydney, Australia
The T sets, also referred to as the Tangara trains, are a class of double-decker electric multiple units (EMU) that operate on the Sydney Trains network
New_South_Wales_T_set
Motor vehicle anti-theft device
which was recognised by an RFID loop (transponder) around the lock barrel and checked against the vehicle's engine control unit (ECU) for a match. If
Immobiliser
64-bit extension of the ARM architecture
data placement Granular data isolation for confidential compute Bitwise locking of EL1 system registers Improved scaling of Granular Protection Tables
AArch64
Variety of the Hakka Chinese language
(-m, -n, -ŋ), and three checked codas (-p, -t, -k). This yields eighteen open finals, twenty-one nasal finals, nineteen checked finals, and two syllabic
Pontianak_Hakka
Irish mixed martial artist (born 1988)
Goddard: while he pushed and confronted Goddard in a wild melee, he also checked on the downed Redmond and knocked him down while he was trying to get up
Conor_McGregor
Revolver
for windage and elevation. Frame: square butt with grooved tangs Stocks: checked walnut service with S&W monograms Finish: S&W (CHROME) with sandblasting
Smith_&_Wesson_Model_15
Groundhawk into unconsciousness. Seven on 7 revealed that Groundhawk has been checked into Vought's Global Wellness Center to combat his alcoholism. In The Boys
List_of_The_Boys_characters
2023 New York Times article
October 7 attacks. Al Jazeera English also reported on allegations of a double standard with regard to coverage of the Israeli–Palestinian conflict in
Screams_Without_Words
Device used to join fiber optic strands in communication systems
insertion; then the bayonet interlock can be engaged, by pushing and twisting, locking at the end of travel which maintains spring-loaded engagement force on
Optical_fiber_connector
British television series by Tom Basden
to. Cast and crew "wore masks at all times" and had their temperatures checked each day by COVID supervisors. The show being filmed from the perspective
Here_We_Go_(TV_series)
Radiotherapy machine involved in six accidents
day after the accident, AECL technicians checked the machine and were unable to replicate error 54. They checked the grounding of the machine to rule out
Therac-25
Use of a device to remotely catch an animal
the closure of the doors and the falling of a lock mechanism prevents the animal from escaping by locking the door(s) shut. With two doors open, the squirrel
Trapping
Free online crowdsourced encyclopedia
changes. "New pages patrol" is a process where newly created articles are checked for obvious problems. In 2003, economics PhD student Andrea Ciffolilli
Wikipedia
Australian TV quiz show
now worth 10 points to the contestants' scores and an incorrect answer locking them out for the following question. When the time runs out the contestant
Million_Dollar_Minute
2015 American film
murder of the second Albanian and Harding has the ballistics on Danny's gun checked to confirm the video. Mike arrives at the cabin and alerts the police to
Run_All_Night_(film)
Copper helmet with rubberised canvas diving suit and weighted boots
the helmet swung forward over the head to close, and locked by a clamp in front with a locking device to prevent inadvertent opening. In the United States
Standard_diving_dress
Social networking service owned by Meta Platforms
servers, containing information about users' friends, likes, groups, and checked-in locations, as well as names, passwords and email addresses. The phone
Phase since 2022 of war ongoing since 2014
Retrieved 15 December 2024. "Ukraine war: President Putin speech fact-checked". BBC News. 21 February 2023. Retrieved 3 August 2025. Etkind, Alexander
Russo-Ukrainian war (2022–present)
Russo-Ukrainian_war_(2022–present)
Rail traffic control systems used in the United Kingdom
approach control) may be used. The driver will be "checked down" with a normal signalling sequence (green, double yellow, yellow for a four-aspect area) and the
UK_railway_signalling
ride. The ride operator accidentally pressed a button releasing the seat locking pins after the train departed, which were responsible for keeping the seats
Incidents_at_Six_Flags_parks
Medical condition
decrease in the baby's heart rate during delivery. Nuchal cords are typically checked for by running the finger over the baby's neck once the head has delivered
Nuchal_cord
Extremely large shotgun for harvesting waterfowl
that clandestine big gun hunting persisted for decades, only partially checked by state and federal authorities. Not until the 1940s were the last of
Punt_gun
British ring of spies for the Soviet Union
(Donald Pleasence) is clearly modelled after Philby. Philby is later name-checked as the sports reporter on The Daily Telegraph in Potter's Lipstick on Your
Cambridge_Five
ground and air units of these forces, in association with Allied units, checked the hostile advance, drove the enemy back to the seacoast and in a series
List of recipients of the United States Presidential Unit Citation
List_of_recipients_of_the_United_States_Presidential_Unit_Citation
Formal specification language
liveness (good things eventually happen). TLA+ is also used to write machine-checked proofs of correctness both for algorithms and mathematical theorems. The
TLA+
Film by Eli Roth
out. He returns to the hostel, where he learns that he had supposedly checked out. He is greeted by two women who invite him to the spa. Determined to
Hostel_(2005_film)
Mechanical device that closes a door in a controlled manner
only, as time went on the rate at which the door closed was arrested or checked by adding an additional checking device. Door closers at this time were
Door_closer
Flight that exploded over Longmont, Colorado in November 1955
that was blown up on November 1, 1955, by a dynamite bomb placed in the checked luggage. The explosion occurred over Weld County, Colorado, 8 miles east
United_Air_Lines_Flight_629
1940 American film
hotel clerk switches Jean's room to one adjoining David's, separated by locking double doors. Freddie, suspicious of David's intentions, secretly follows them
Lucky_Partners
Portrayal of sexual subject matter
of them." To cultivate shame in Muslims, their sexual gaze needs to be checked, as unchecked gaze is believed to be the door through which Satan enters
Pornography
Australian-American serial killer (1945–1984)
Oklahoma City. Wilder took her 180 miles north to Newton, Kansas, and checked into room 30 of the Interstate 35 Inn. After breakfast the next morning
Christopher_Wilder
American rapper (born 1959)
of cocaine and marijuana. His family performed an intervention, and he checked into the Betty Ford Center in Rancho Mirage, California for an addiction
Flavor_Flav
List of models of Sony's PlayStation
including workarounds for them in the libraries - the later library versions checked the GPU type at startup time and disabled the patches if they were not
PlayStation_models
room 1046 at the Hotel President in Kansas City, Missouri, which he had checked into under an assumed name, was not identified as Artemus Ogletree (20)
List of unsolved murders (1900–1979)
List_of_unsolved_murders_(1900–1979)
2019 American science fiction drama
to drill even though Kelly insists the core samples have not been fully checked for microbial life. Danny's drug problem worsens, and Ed removes him from
For_All_Mankind_(TV_series)
Revenue service of the U.S. federal government
were collected. Instead, taxpayers simply completed the form and the IRS checked the form for accuracy. The IRS's workload jumped by ten-fold, triggering
Internal_Revenue_Service
Brazilian mixed martial arts (MMA) fighter
post-fight that Freire had broken his shin in the first round after Henderson checked a low kick with his knee. Freire faced Daniel Straus in a fourth fight
Patrício_Pitbull
Operating system for mobile devices
loader is verified and system partitions such as system and vendor are checked for integrity. Furthermore, this process verifies that a previous version
Android_(operating_system)
Mirror in vehicles that allows the driver to see rearwards
the rearview mirror is usually affixed to the top of the windshield on a double-swivel mount allowing it to be adjusted to suit the height and viewing angle
Rearview_mirror
2018 double homicide and child abduction in Barron, Wisconsin
the house, Patterson checked every room in the house because he wanted "no witnesses left behind." He found the bathroom door locked and began trying to
Kidnapping_of_Jayme_Closs
1991 film by Sidney J. Furie
evacuate everyone. The officers thought that "Boomer" was her dog, but checked anyway. After taking care of one of the cops sent to kill him, Boomer is
The_Taking_of_Beverly_Hills
Railway accident in India
the Delhi-bound Brahmaputra Mail. If the station cabin of Kishanganj had checked that the green signals of the up line had not turned to red, the disaster
Gaisal_train_collision
American actor (1961–2023)
stern interrogation from fellow actor Robert De Niro. De Niro personally checked Sizemore into rehabilitation. In early 2014, a recording emerged of Sizemore
Tom_Sizemore
Medical device used to hold body tissues together
but risks failing if the suture is cut in just one place; the continuous locking stitch is in some ways a more secure version. The chest drain stitch and
Surgical_suture
Italian-American organized crime group
2013. Escaping the Law, One Last Time...: An Elusive Mobster's End, Double-Checked by William K. Rashbaum February 1, 2011, The New York Times. "Barney's
Genovese_crime_family
American football player (born 1997)
former Cincinnati Bengals player Trey Hendrickson. In March 2020, Crosby checked into rehab for alcoholism. In February 2022, he got engaged to Rachel Washburn
Maxx_Crosby
2021 manslaughter on a film set
take of every angle of every scene; the same prop gun could be checked and re-checked dozens upon dozens of times in a single day. Live ammunition, without
Rust_shooting_incident
American serial killer (born 1946)
the corner of Lexington Avenue and 25th Street in Manhattan. The pair checked into a Quality Inn in Hasbrouck Heights, New Jersey, at Room 117. O'Dell
Richard_Cottingham
System that regulates the formation of blocks on a blockchain
requester finds the relevant response in the set, which is sent back and checked by the provider. As the challenge is chosen on the spot by the provider
Proof_of_work
79th edition of Major League Baseball's championship series
(unearned) double to Gantner. Before relieved by Jim Kaat, Bair walked Molitor and gave up a bases-loaded, two-run (both unearned) checked-swing single
1982_World_Series
Phonetic alphabet
tone, (·.·) dipping tone, (.·.) peaking tone. (؛ ,·؛.) were high and low checked tones. Preceding a word, (·:·) and (.:.) meant to speak in high or low
Palaeotype_alphabet
while he visited a nearby woman for sex. He once threatened a woman by locking her in the room with him and suggesting that he would rape her unless she
List_of_The_Shield_characters
2019 death in custody in New York, US
body, guard Tova Noel giving him burnt food, and a guard intentionally locking him in a shower cell without clothes for an hour. Both notes contained
Death_of_Jeffrey_Epstein
they had indefinitely locked Trump's account for "repeated and severe violations" of the site's Civic Integrity policy. "Locking" meant that Trump could
Use_of_X_by_Donald_Trump
General-purpose programming language
variance in the overheads of checked indexing: 23.6% of benchmarks do report significant performance hits from checked indexing, but 64.5% report little-to-no
Rust_(programming_language)
Season of television series
has been redesigned to what has been described as a "centrifugal inter-locking RGB rainbow test card" by its designer Daniel Eatock. On Channel 4, Davina
Big Brother (British TV series) series 8
Big_Brother_(British_TV_series)_series_8
2023 death in New York City, U.S.
Neely's forehead, but was told to stop by Penny. Other passengers also checked on him, including an onlooker who warned Penny about killing Neely, who
Killing_of_Jordan_Neely
2001 World Wrestling Federation pay-per-view event
collided, Raven rolled out of the ring, as Tazz came down. As the referee checked on Raven, Tazz performed a T-Bone suplex to Regal. Tazz left, and Raven
WWF_Invasion
British racing driver (born 1998)
more point than his teammate. Despite the unfortunate season, Russell checked off several career firsts in 2022, including his first podium in a full-length
George Russell (racing driver)
George_Russell_(racing_driver)
Builder of Coral Castle
sardines. In his later years, he starved himself. On November 9, 1951, he checked himself into Jackson Memorial Hospital in Miami. Apparently, Leedskalnin
Edward_Leedskalnin
1959 film by Herbert L. Strock
many interesting facts, such as the late time (9:12PM) Pete and Rivero checked out the night of Jeffrey Clayton's murder. He explains he hopes to work
How to Make a Monster (1958 film)
How_to_Make_a_Monster_(1958_film)
2013 murders in California
That's what this is about, my name." According to military sources, Dorner checked into Naval Base Point Loma in San Diego, but skipped checkout procedures
Christopher Dorner shootings and manhunt
Christopher_Dorner_shootings_and_manhunt
Warner Bros. theatrical cartoon character
could imagine. And yet again, in Really Scent, Pepé removes his odor by locking himself in a deodorant plant so Penelope (known in this short as "Fabrette";
Pepé_Le_Pew
Russian serial killer duo
all over the Internet; because of this, the Irkutsk police for some time checked for leaks of information, since an erroneous version of the video itself
Academy_maniacs
1998 World Wrestling Federation pay-per-view event
went to work on McMahon’s leg, attacking it with several elbow drops and locking in a submission hold while Kane kept McMahon’s associates Pat Patterson
Judgment_Day:_In_Your_House
and refused medical aid to injured civilians, HRW said. Russian soldiers checked documents and killed anyone who had fought in Donbas or had tattoos of
War crimes in the Russo-Ukrainian war (2022–present)
War_crimes_in_the_Russo-Ukrainian_war_(2022–present)
In-development multiplayer space game
Citizen to No Man's Sky and Elite: Dangerous, writing that "Last time I checked, Star Citizen writ large was a hope wrapped inside a dream buried inside
Star_Citizen
Process of counting votes in an election
where the voter intended. Officials also check if the number of voters checked in at the polling place matches the number of ballots voted, and that the
Vote_counting
2000 film by Jon Steven Ward
own hook. The next day, at lovers lane, Mandy and Michael are medically checked before they leave. The young couple enter a police car, that is revealed
Lovers_Lane_(2000_film)
Set of rules defining correctly structured programs for the Rust programming language
type to implement Add. This means that a generic function can be type-checked as soon as it is defined. The implementation of generics is similar to
Rust_syntax
Chinese serial killer and dog breeder (1962–1995)
Inner Mongolia. He eventually found himself in Otuokeqianqi, where he checked into a local motel under the name "Bai Baoshan", which was coincidentally
Peng_Cheng_(serial_killer)
DOUBLE CHECKED-LOCKING
DOUBLE CHECKED-LOCKING
Surname or Lastname
French
French : from a reduced form of the Germanic personal name Hildo (see Hildebrand, Houde).French : habitational name from any of several places in Normandy called La Houle or Les Houles, named in Old French with the singular or plural of houle ‘cave’.English : variant of Hole.
Male
English
English name derived from the vocabulary word, from Latin nobilis, NOBLE means "noble."
Girl/Female
Arabic, Australian, German, Muslim
Rosy-cheeked
Surname or Lastname
English
English : habitational name from any of various places called Checkley, in Cheshire, Herefordshire, and Staffordshire. The first is named from an Old English personal name Ceaddica + lēah ‘woodland clearing’; the other two have the same second element, combined with an Old English personal name Ceacca or Old English ceacce ‘hill’.
Male
English
Anglicized form of Irish Gaelic Dubhghall, DOYLE means "black stranger."Â
Boy/Male
Hindu, Indian
Money; Russian Currency
Girl/Female
Arabic, Muslim
Rosy-cheeked
Surname or Lastname
English
English : from the medieval personal name Dobbe, one of several pet forms of Robert in which the initial letter was altered. Compare Hobbs.
Male
English
Anglicized form of Hebrew Kesed, CHESED means "increase." In the bible, this is the name of the 4th son of Nahor.
Surname or Lastname
English
English : variant of Dibble.Altered spelling of German Deibel or Deubel.
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : variant of Double.In some cases, probably an altered spelling of South German Dobel or Döbel, a topographic name for someone who lived in a gorge or deep valley, Middle High German southern dialect tobel.
Girl/Female
Muslim
Rosy-cheeked
Male
Czechoslovakian
, downy-cheeked, or, soft-haired.
Boy/Male
Hindu
Born during the rainy season, Money
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : nickname from Old French doubel ‘twin’ (literally ‘double’, from Late Latin duplus, classical Latin duplex, from du(o) ‘two’ + plek, a root meaning ‘fold’).
Girl/Female
Christian, Hindu, Indian, Kannada
Money
Boy/Male
Hindu
Full checked
Boy/Male
Tamil
Full checked
Female
Czechoslovakian
, downy-cheeked, or, soft-haired.
Surname or Lastname
English
English : possibly a variant of Goble or Gobel.Perhaps an Americanized spelling of French Gobeil.
DOUBLE CHECKED-LOCKING
DOUBLE CHECKED-LOCKING
Boy/Male
Indian, Sanskrit
Owns Ten Chariots
Boy/Male
Biblical
My lord; my prince; my song.
Female
Hebrew
(× Ö´×™×¨) Hebrew unisex name NIR means "to cultivate a field."
Boy/Male
English American French
Spear strength.
Boy/Male
Indian, Malayalam
One who Loved by God
Boy/Male
Indian, Tamil
Good
Biblical
Jehovah pressing; the meditation of God
Girl/Female
Hindu
Image
Girl/Female
Indian, Marathi
Knowing; Knowledge; Having a Lot of Knowledge
Boy/Male
Tamil
Vyushtt | வà¯à®¯à¯à®·à¯à®¤à¯à®¤
Clear
DOUBLE CHECKED-LOCKING
DOUBLE CHECKED-LOCKING
DOUBLE CHECKED-LOCKING
DOUBLE CHECKED-LOCKING
DOUBLE CHECKED-LOCKING
v. t.
A piece in the game of draughts or checkers.
v. t.
A pattern in checks; a single check.
a.
Checkered; designed in checks.
imp. & p. p.
of Double
a.
To increase by adding an equal number, quantity, length, value, or the like; multiply by two; to double a sum of money; to double a number, or length.
adv.
In a double degree; doubly.
n.
The act of one that doubles; a making double; reduplication; also, that which is doubled.
n.
Double beer; strong beer.
n.
One who, or that which, doubles.
imp. & p. p.
of Check
a.
Double; doubled; reduplicative; repeated.
n.
Double-quick time, step, or march.
v. t.
One who checks.
a.
Having (such) a chest; -- in composition; as, broad-chested; narrow-chested.
n.
The state of being double or doubled.
adv.
Twice; doubly.
n.
Among compositors, a doublet (see Doublet, 2.); among pressmen, a sheet that is twice pulled, and blurred.
imp. & p. p.
of Checker
a.
Cracked or checked; split. See Shake, n., 2.
a.
To be the double of; to exceed by twofold; to contain or be worth twice as much as.