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Synchronization mechanism
science, read-copy-update (RCU) is a synchronization mechanism that avoids the use of lock primitives while multiple threads concurrently read and update elements
Read-copy-update
Multithreaded to allow concurrent access
Widely used within the Linux kernel, read-copy-update (RCU) is especially useful in cases where the number of reads far exceeds the number of writes. Naturally
Concurrent_hash_table
Property of the ACID database system
started and which finished; or by keeping a copy of the data before any changes occurred (Read-copy-update). Several filesystems have developed methods
Atomicity_(database_systems)
Concurrency control method commonly used by database management systems
which is known as a read-write lock. Locks are known to create contention especially between long read transactions and update transactions. MVCC aims
Multiversion concurrency control
Multiversion_concurrency_control
Special locking mechanism used in Linux
themselves must be updated or changed, using read-copy-update synchronization is preferred. This was first applied to system time counter updating. Each time
Seqlock
Multithreading computing anomaly
another way to defer reclamation is to use read-copy update (RCU), which involves enclosing the update in an RCU read-side critical section and then waiting
ABA_problem
Synchronization primitive in computing
unwrap(); *w += 1; assert_eq!(*w, 6); } // write lock is dropped here The read-copy-update (RCU) algorithm is one solution to the readers–writers problem. RCU
Readers–writer_lock
Server for the Domain Name System
techniques and data structures to make the server very fast, notably Read-copy-update or a special kind of a radix tree. Knot DNS uses a zone parser written
Knot_DNS
Revision of the C++ programming language released in 2026
Compile-time reflection support <rcu>: Support for safe reclamation read-copy-update mechanism <simd>: Data-parallel access (Single instruction, multiple
C++26
Algorithm in a thread whose failure cannot cause another thread to fail
unconditionally be implemented safely using only a memory barrier Read-copy-update with a single writer and any number of readers. (The readers are wait-free;
Non-blocking_algorithm
Operating system performance issue
techniques such as fine-grained locking, lock-free data structures, read-copy-update (RCU) synchronization, and per-CPU data structures, which together
Software_lockout
Property of some operation(s) in concurrent programming
Conflict-free replicated data type (CRDT) Consistency model Read-copy-update (RCU) Read-modify-write Time of check to time of use Herlihy, Maurice P
Linearizability
Undesireable computing scheduling scenario
avoid blocking, for example, by using non-blocking algorithms such as read-copy-update. Nice (Unix) Non-blocking synchronization Pre-emptive multitasking
Priority_inversion
Free and open-source operating system
serializing token code is evolving into something quite similar to the "Read-copy-update" feature now available in Linux. Unlike Linux's current RCU implementation
DragonFly_BSD
this, forms of it (Read-Copy-Update for instance) are now used extensively in the Linux kernel (over 18,000 times as of April 2021[update] and has grown from
Relativistic_programming
Concept in computer science, referring to processes, or data
codes which are accessed very frequently but don't change very often; read-copy-update (RCU). Enabling and disabling of kernel preemption replaced spinlocks
Synchronization (computer science)
Synchronization_(computer_science)
Free Unix-like operating system kernel
inversion), support for High Precision Event Timers (HPET), preemptive read-copy-update (RCU), (forced) IRQ threads, and other minor features. In 2023, Peter
Linux_kernel
Computer science problem in concurrency
smokers problem Sleeping barber problem Readers–writer lock seqlock read-copy-update Tanenbaum, Andrew S. (2006), Operating Systems - Design and Implementation
Readers–writers_problem
Information systems good practice for data normalization
master data is copied but the copies are only read and only the master data is updated; if requests to read data are only made on copies, this is an instance
Single_source_of_truth
Measures to ensure concurrent computing operations generate correct results
such as deadlock. Other solutions are Non-blocking algorithms and Read-copy-update. Linearizability – Property of some operation(s) in concurrent programming
Concurrency_control
Live patching feature for Linux kernel
that, kGraft maintains original versions of patched functions in a read-copy-update (RCU) fashion, and dynamically selects between the original and patched
KGraft
Topics referred to by the same term
RCU may refer to: Read-copy-update, a computer operating system synchronization mechanism Remote concentrator unit in telephony Organocopper complexes
RCU
Taiwanese computer scientist
include the iWarp system architecture, optimistic concurrency control, read-copy-update a mutual exclusion synchronization method used in the Linux kernel
H._T._Kung
Legal and public disputes between a software company and Linux vendors and users
related to symmetric multiprocessing (SMP), Journaled File System (JFS), Read-copy-update (RCU) and Non-Uniform Memory Access (NUMA). The code was not shown
SCO–Linux_disputes
American computer hardware company
(e.g., cache management and interrupt handling) and software (e.g., read-copy-update). Through a partnership with Oracle Corporation, Sequent became a dominant
Sequent_Computer_Systems
U.S. federal court case about Linux use
multiprocessing (SMP), Non-uniform memory access (NUMA) multiprocessing, the read-copy-update (RCU) locking strategy, This technique is widely believed to have been
SCO Group, Inc. v. International Business Machines Corp.
SCO_Group,_Inc._v._International_Business_Machines_Corp.
Programming technique for efficiently duplicating data
being read-only and the upper layer available for editing. Creating a new image which shares the same base layers as another image does not copy the layers
Copy-on-write
Protection of software, films, music, other media
Copy protection, also known as content protection, copy prevention and copy restriction, is any measure to enforce copyright by preventing the reproduction
Copy_protection
Copy-on-write file system
file or volume Atomic writable (via copy-on-write) or read-only snapshots of subvolumes File cloning (reflink, copy-on-write) via cp --reflink <source
Btrfs
2015 Microsoft operating system version
The Microsoft Services agreement reads that the company's online services may automatically "download software updates or configuration changes, including
Windows_10
Equivalence of all cached copies of a memory location
behavior of reads and writes to a single address location. In a multiprocessor system, consider that more than one processor has cached a copy of the memory
Cache_coherence
copy are set SC Write Miss - Like with Read Miss, the data comes from the "owner", D or SD or from MM, then the cache is updated - If there is a copy
List of cache coherency protocols
List_of_cache_coherency_protocols
Network protocol for copying files between computers
Secure copy protocol (SCP) is a means of securely transferring computer files between a local host and a remote host or between two remote hosts. It is
Secure_copy_protocol
Form of non-volatile memory used in computers and other electronic devices
2007[update] large RAM chips can be read faster than most ROMs. For this reason (and to allow uniform access), ROM content is sometimes copied to RAM
Read-only_memory
Data and process for mutating a software resource to a desired state
manage this, the number of supported versions may be limited, or a complete copy of the resource might be provided instead. Patching allows for modifying
Patch_(computing)
Measures to thwart copying of disc-based media
information, the drive can detect and repair many (but not all) types of read-error. Copy protections can use these fields as a distinctive feature by purposely
CD_and_DVD_copy_protection
Free online crowdsourced encyclopedia
Wikipedia is the largest and most read reference work in history. Initially available only in English, as of 2026,[update] Wikipedia has grown to over 300
Wikipedia
Improving the formatting, style, and accuracy of text
Copy editing (also known as copyediting and manuscript editing) is the process of revising written material ("copy") to improve quality and readability
Copy_editing
Microsoft technology for storage snapshots
VSS operates at the block level of volumes. A snapshot is a read-only point-in-time copy of the volume. Snapshots allow the creation of consistent backups
Shadow_Copy
Computer programming environment
the same textual format that the read function uses for input, most results are printed in a form that could be copied and pasted back into the REPL. However
Read–eval–print_loop
The truth is, though, that we cannot know how many copies have been made, sold, or, much less, read in the four hundred years since Don Quixote was first
List_of_best-selling_books
Computer mechanism
number. Process B now reads the same record from the same file, so it has its own copy. Process A changes the account balance in its copy of the customer record
File_locking
Cache coherence protocol
copies, moving its own copy to the Modified state when this is complete, but alternatively it may use a write-through policy, telling them to update their
MOESI_protocol
Database stored query result set
base tables, then the view is updatable. INSERT, UPDATE, and DELETE operations can be performed on updatable views. Read-only views do not support such
View_(SQL)
Mail sent using electronic means
relatively easy for others to intercept and read messages. many Internet Service Providers (ISP) store copies of email messages on their mail servers before
processors. Update based protocols such as the Dragon protocol perform efficiently when a write to a cache block is followed by several reads made by other
Dragon_protocol
Cache coherence protocol for computer processors
the main memory at some time in the future, before permitting any other read of the (no longer valid) main memory state. The write-back changes the line
MESI_protocol
Italian newspaper
Leggo (Italian for 'I read') is an Italian newspaper and was the first free daily newspaper published in Italy. Leggo was established by Caltagirone Editore
Leggo
Rules that guarantee predictable computer memory operation
can read their local copy of data items. After the primary finishes its update, the update is forwarded to other replicas and all perform the update locally
Consistency_model
Special folder in Microsoft Windows
folder, i.e. with support for copy-paste and drag-and-drop. It has additional functions and toolbar buttons for updating out-of-sync files. The Windows
Briefcase_(Microsoft_Windows)
Robustness properties for database transactions
in the event of a crash. In shadowing, updates are applied to a partial copy of the database, and the new copy is activated when the transaction commits
ACID
Data structure that always preserves the previous version of itself when it is modified
for m modifications of an array of size n. Copy-on-write memory management can reduce the price for an update from Θ ( n ) {\displaystyle \Theta (n)} to
Persistent_data_structure
Proprietary file system developed by Microsoft
Bordet and offers native read-only NTFS support by default on i386 and amd64 platforms as of version 4.9 released 1 May 2011.[update] Linux kernel versions
NTFS
Syrian-Saudi calligrapher
reviewing. His beautiful, clear, easy-to-read style used in the Madina Muṣḥaf is also used in a commercial copy known as Mushaf al-Tajweed.[citation needed]
Uthman_Taha
Version control system by Google
apply changes to a local copy of files, similar to a working copy in Subversion, local clone in Git, or a client in Perforce. Updates made by other developers
Piper_(source_control_system)
Computer security vulnerability
with the right timing, a local attacker can exploit the copy-on-write mechanism to turn a read-only mapping of a file into a writable mapping. Although
Dirty_COW
Email service provided by Google
tabs are: Primary, Social, Promotions, Updates, and Forums. In addition to customization options, the entire update can be disabled, allowing users to return
Gmail
Type of file format
format for Autodesk GIS programs MapGuide and AutoCAD Map 3D. As of 2014[update] SDF format version SDF3 (based on SQLite3) uses a single file. Prior versions
Spatial_Data_File
1987 studio album by Wire
The Ideal Copy is the fourth studio album by the English rock group Wire, released in April 1987 by Mute Records. It was the first full-length recording
The_Ideal_Copy
Computer maintenance utility
candidates for deletion are categorized as: "Windows Update Cleanup": Copies of Windows updates that are already installed "Microsoft Defender Antivirus":
Disk_Cleanup
1965 novel by John Williams
Stoner discovers that Katherine has published a book, and after obtaining a copy, discovers it is dedicated to him. Stoner learns that he has cancer of the
Stoner_(novel)
an update will propagate through the system and all replicas will be consistent after a fixed time period δ. In other words, the result of any read operation
Delta_consistency
Pre-pressed compact disc containing computer data
compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data computers can read, but not
CD-ROM
2014 novel by Emily St. John Mandel
It appeared on several best-of-year lists. As of 2020,[update] it had sold 1.5 million copies. A ten-part television adaptation of the same name premiered
Station_Eleven
Lossless data compression algorithms
the read pointer need only trail in sync with the write pointer by a fixed distance equal to the run length LR until L characters have been copied to output
LZ77_and_LZ78
Phenomenon associated with solid state storage
rewriting some data requires an already-used-portion of flash to be read, updated, and written to a new location, together with initially erasing the
Write_amplification
HTTP extension for collaborative editing
querying of file information. Namespace management deals with the ability to copy and move web pages within a server's namespace. Collections deal with the
WebDAV
2009 mobile operating system
the "iPhone OS" naming convention. iPhone OS 3 added a system-wide "cut, copy, and paste" feature, allowing users to move content more easily. It also
IPhone_OS_3
Data storage technology
by RAID were conceived in the 1970s and 1980s: data striping to improve read/write efficiency, and disk mirroring or parity drives for data recovery.
RAID
File system for computers
uses the weak consistency model. Read and write operations on an open file are directed only to the locally cached copy. When a modified file is closed
Andrew_File_System
Operating system for the Nintendo Wii
to convince people to update. Nintendo's next few updates made similar small changes to various channels, and one of them copied the fix for the previous
Wii_system_software
Software license agreements
episode "HumancentiPad", where Kyle had neglected to read the terms of service for his last iTunes update and therefore inadvertently agreed to have Apple
End-user_license_agreement
Speculative fiction novel series by Matt Dinniman
reality show program. As of December 2025,[update] the first eight books have sold over ten million copies. The eighth book was released in May 2026,
Dungeon_Crawler_Carl
directed that the Declaration be read to the troops on July 9. Another copy was sent to England. In 1949, 14 copies of the Dunlap broadside were known
Physical history of the United States Declaration of Independence
Physical_history_of_the_United_States_Declaration_of_Independence
E-book reading device or technology
engine that can read the text from e-books and an MP3 player that can be used to play music while reading. The Kindle's operating system updates are designed
Amazon_Kindle
Cloud-based spreadsheet software
2015, the mobile website for Sheets was updated with a "simpler, more uniform" interface. While users can read spreadsheets through the mobile websites
Google_Sheets
2006 Microsoft operating system version
Incremental changes are saved by shadow copies, which helps to limit the disk space in use. Windows Update is now a native client application; in previous
Windows_Vista
Removable disk storage medium
dust from the spinning disk. Floppy disks store digital data, which can be read or written when inserted into a floppy disk drive (FDD) connected to or built
Floppy_disk
Linux kernel interface for storage devices
performance issues with similar interfaces provided by functions like read()/write() or aio_read()/aio_write() for operations on data accessed by file descriptors
Io_uring
Pejorative term for highly repetitive programming
Copy-and-paste programming, sometimes referred to as just pasting, is the production of highly repetitive computer programming code, as produced by copy
Copy-and-paste_programming
2009 Microsoft operating system version
22 July 2010[update], Windows 7 had sold 175 million copies. On October 21, 2010, Microsoft announced that more than 240 million copies of Windows 7 had
Windows_7
Electro-mechanical data storage device
As of November 2019[update], the platters in most consumer-grade HDDs spin at 5,400 or 7,200 rpm. Information is written to and read from a platter as it
Hard_disk_drive
Cross-platform instant messaging service
2021, with a billion downloads globally as of late August 2021. As of 2024[update], registration to Telegram requires either a phone number and a smartphone
Telegram_(software)
Consistency model used in distributed computing to achieve high availability
ensures that if no new updates are made to a given data item, eventually all read accesses to that item will return the last updated value. Eventual consistency
Eventual_consistency
Historical centralized version control system
out" a complete copy of the project, work on this copy and then later "check in" their changes. CVS servers can allow "anonymous read access", wherein
Concurrent_Versions_System
List of iOS operating system versions
for not supporting content made with Adobe Flash, lacking support for cut, copy and paste features, as well as its lack of support for Bluetooth stereo headphones
IOS_version_history
Sharing information to ensure consistency in computing
in that the saved copy of data remains unchanged for a long period of time. Replicas, on the other hand, undergo frequent updates and quickly lose any
Replication_(computing)
Music news service and website
"About CMU | FAQ | Complete Music Update". Archived from the original on 2014-02-12. Retrieved 2014-02-18. "Archived copy". Archived from the original on
Complete_Music_Update
Messaging and VoIP service owned by Meta
researchers notified Meta (who updated the enumeration problem in October), and deleted their copy of the phone numbers. As of 2023[update], WhatsApp is widely
Stored data in computer systems
applications use journaling and are typically based on periodic "snapshots", read-only copies of the data frozen at a particular point in time. Near-CDP (except
Backup
Design language developed by Apple
2025. Rogers, Reece. "'Beautiful' and 'Hard to Read': Designers React to Apple's Liquid Glass Update". Wired. ISSN 1059-1028. Archived from the original
Liquid_Glass
1978 novel by William Luther Pierce
form by the National Alliance in 1978. As of 2001,[update] the book had sold an estimated 300,000 copies, initially only available through mail order from
The_Turner_Diaries
IT architecture separating actions and reads
method of a stack as an example. Idempotence Domain-driven design Create, read, update and delete (CRUD) Meyer, Bertrand. "Eiffel: a language for software engineering"
Command–query_separation
1997 book by Dossie Easton and Janet Hardy
edition. Revised and updated editions were published in 2009 and 2017, with updated subtitles. The Ethical Slut is widely read by non-monogamous and
The_Ethical_Slut
Additional storage that enables faster access to main storage
which case the copy in the cache may become out-of-date or stale. Alternatively, when the client updates the data in the cache, copies of that data in
Cache_(computing)
Multi-tool electronic device
developed for interaction with access control systems. The device is able to read, copy, and emulate RFID and NFC tags, radio remotes, iButtons, and digital access
Flipper_Zero
2025 video game
from critics and was widely acclaimed by audiences, selling over 4 million copies. Dispatch is an adventure video game, where the player's choices affect
Dispatch_(video_game)
Class member in object-oriented programming
allows for data validation, active updating (e.g., of GUI elements), or implementation of what may be called "read-only fields". Programming languages
Property_(programming)
Operating system for the Nintendo Switch and Nintendo Switch 2
multiplayer games using a single copy of the game. While the feature was introduced to the Nintendo Switch in the 20.0.0 update, GameShare requires a Nintendo
Nintendo Switch system software
Nintendo_Switch_system_software
Comic book produced only for legal or promotional reasons
mass consumption. In the film and television industries, the term "ashcan copy" has been adopted for low-grade material created to preserve a claim to licensed
Ashcan_comic
READ COPY-UPDATE
READ COPY-UPDATE
Boy/Male
Arabic, Australian, British, English, Muslim
Leader; Red
Male
English
Variant spelling of English Cody, COTY means "helper."Â
Boy/Male
British, English
Red Haired
Boy/Male
American, Anglo, Australian, British, English, Scottish
Redheaded; With Red Hair; Surname
Surname or Lastname
English
English : variant of Read 1.
Boy/Male
English
Red haired.
Male
English
English surname transferred to forename use, derived from an Old English byname, Red, READ means "red-headed or ruddy-complexioned."Â
Surname or Lastname
English
English : variant spelling of Read.
Boy/Male
American, Anglo, British, Christian, English, German, Hindu, Indian, Scottish
Red-headed; Red Haired; Ruddy Complexioned
Boy/Male
American, Anglo, Australian, British, Christian, English, Jamaican
Form of Reed; A Reed; Red-haired
Male
English
Variant spelling of English Red, REDD means "red-headed; ruddy complexioned."
Male
English
Variant spelling of English Corey, possibly CORY means "deep hollow, ravine."
Surname or Lastname
English
English : nickname for a person with red hair or a ruddy complexion, from Middle English re(a)d ‘red’.English : topographic name for someone who lived in a clearing, from an unattested Old English rīed, r̄d ‘woodland clearing’.English : Read in Lancashire, the name of which is a contracted form of Old English rǣghēafod, from rǣge ‘female roe deer’, ‘she-goat’ + hēafod ‘head(land)’; Rede in Suffolk, so called from Old English hrēod ‘reeds’; or Reed in Hertfordshire, so called from an Old English ryhð ‘brushwood’.English : A family called Read were established in America in the early 18th century by John Read, who was born in Dublin, sixth in descent from Sir Thomas Read of Berkshire, England. His son, George Read (1733–98), was one of the signers of the Declaration of Independence, and as a lawyer helped frame the Constitution.
Boy/Male
English
Red.
Boy/Male
English
Red.
Surname or Lastname
English
English : variant spelling of Read 1.
Male
English
Variant spelling of English Read, REID means "red-headed; ruddy complexioned."Â
Male
English
Variant spelling of English Read, REED means "red-headed; ruddy complexioned."
Surname or Lastname
English
English : topographic name for someone who lived on the top of a hill, from Middle English coppe, Old English copp ‘summit’ (a transferred sense of copp ‘head’, ‘bowl’, cognate with modern English cup), or a habitational name from Copp in Lancashire, named with this word.English : nickname for someone with a large or deformed head, from Middle English cop(p) ‘head’ (the same word as in 1 above).Respelling of German Kopp.
Boy/Male
English American Scottish
Red haired.
READ COPY-UPDATE
READ COPY-UPDATE
Female
Welsh
Welsh form of Greek Talitha, TALAITH means "damsel, maiden."
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi
Rosebud; Hushed
Boy/Male
Australian, Greek
Merciful
Surname or Lastname
English
English : variant of Thatch.Vietnamese (Th&adotu;ch) : unexplained.Cambodian : unexplained.
Boy/Male
Tamil
Divine feet
Surname or Lastname
English
English : from the Old Norse female personal name Gunvǫr, composed of the elements gunn ‘battle’ + vǫr, the feminine form of varr ‘defender’, or possibly from the Old Norse male personal name Gunnarr.English : occupational name for an operator of heavy artillery (see Gunn).Americanized spelling of German Gönner, a habitational name for someone from any of numerous places named Gönne.
Boy/Male
Biblical
Bone of a bone, our strength'.
Girl/Female
Assamese, Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Oriya, Sanskrit, Sindhi, Tamil, Telugu
Light; Glow; Shine; Ray; Bright; Goddess Durga
Boy/Male
Bengali, Gujarati, Hindu, Indian, Malayalam, Mythological, Sindhi
Love; Immortal; God
Surname or Lastname
English
English : from Middle English bagge ‘bag’, hence a metonymic occupational name for a maker of bags and sacks of various kinds, including wallets and purses.English : from the Germanic personal name Bac(c)o, Bahho (see Bacon 1).Swedish : nickname or soldier’s name from Swedish bagge ‘ram’.Danish : from a personal name of uncertain derivation.
READ COPY-UPDATE
READ COPY-UPDATE
READ COPY-UPDATE
READ COPY-UPDATE
READ COPY-UPDATE
n.
Rennet. See 3d Reed.
v. t.
To interpret; to explain; as, to read a riddle.
v. t.
To make a special study of, as by perusing textbooks; as, to read theology or law.
v. i.
To produce a certain effect when read; as, that sentence reads queerly.
a.
capable of being drawn into a thread, as a glutinous substance; stringy; viscous; tenacious; glutinous; as ropy sirup; ropy lees.
n.
That which is to be imitated, transcribed, or reproduced; a pattern, model, or example; as, his virtues are an excellent copy for imitation.
n.
An imitation, transcript, or reproduction of an original work; as, a copy of a letter, an engraving, a painting, or a statue.
v. i.
To study by reading; as, he read for the bar.
n.
One who reads copy to a proof reader.
n.
Manuscript or printed matter to be set up in type; as, the printers are calling for more copy.
n.
To make a copy or copies of; to write; print, engrave, or paint after an original; to duplicate; to reproduce; to transcribe; as, to copy a manuscript, inscription, design, painting, etc.; -- often with out, sometimes with off.
v. i.
To make a copy or copies; to imitate.
a.
See Cozy.
v. i.
To yield a duplicate or transcript; as, the letter did not copy well.
v. t.
To be at the head of; to put one's self at the head of; to lead; to direct; to act as leader to; as, to head an army, an expedition, or a riot.
v. t.
To go over, as characters or words, and utter aloud, or recite to one's self inaudibly; to take in the sense of, as of language, by interpreting the characters with which it is expressed; to peruse; as, to read a discourse; to read the letters of an alphabet; to read figures; to read the notes of music, or to read music; to read a book.
imp. & p. p.
of Read
n.
An individual book, or a single set of books containing the works of an author; as, a copy of the Bible; a copy of the works of Addison.
v. i.
To form a cope or arch; to bend or arch; to bow.