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- Read-modify-write abstract "In computer science, read-modify-write is a class of atomic operations such as test-and-set, fetch-and-add, and compare-and-swap which both read a memory location and write a new value into it simultaneously, either with a completely new value or some function of the previous value. These operations prevent race conditions in multi-threaded applications. Typically they are used to implement mutexes or semaphores. These atomic operations are also heavily used in non-blocking synchronization.Maurice Herlihy (1991) ranks atomic operations by their consensus numbers, as follows: ∞: memory-to-memory move and swap, augmented queue, compare-and-swap, fetch-and-cons, sticky byte, load-link/store-conditional (LL/SC) 2n - 2: n-register assignment 2: test-and-set, swap, fetch-and-add, queue, stack 1: atomic read and atomic writeIt is impossible to implement an operation that requires a given consensus number with only operations with a lower consensus number, no matter how many of such operations one uses.Read-modify-write instructions often produce unexpected results when used on I/O devices, as a write operation may not affect the same internal register that would be accessed in a read operation.This term is also associated with RAID levels performing actual write operations as atomic read-modify-write sequences. Such RAID levels include RAID 4, RAID 5 and RAID 6.".
- Read-modify-write wikiPageID "5587875".
- Read-modify-write wikiPageRevisionID "589758502".
- Read-modify-write hasPhotoCollection Read-modify-write.
- Read-modify-write subject Category:Computer_memory.
- Read-modify-write subject Category:Concurrency_control.
- Read-modify-write comment "In computer science, read-modify-write is a class of atomic operations such as test-and-set, fetch-and-add, and compare-and-swap which both read a memory location and write a new value into it simultaneously, either with a completely new value or some function of the previous value. These operations prevent race conditions in multi-threaded applications. Typically they are used to implement mutexes or semaphores.".
- Read-modify-write label "RMW-Befehl".
- Read-modify-write label "Read-modify-write".
- Read-modify-write sameAs RMW-Befehl.
- Read-modify-write sameAs m.0dtz4t.
- Read-modify-write sameAs Q1593306.
- Read-modify-write sameAs Q1593306.
- Read-modify-write wasDerivedFrom Read-modify-write?oldid=589758502.
- Read-modify-write isPrimaryTopicOf Read-modify-write.