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About: Compare-and-swap     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:ProgrammingLanguage, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: programming language New Facet based on Instances of this Class

In computer science, compare-and-swap (CAS) is an atomic instruction used in multithreading to achieve synchronization. It compares the contents of a memory location with a given value and, only if they are the same, modifies the contents of that memory location to a new given value. This is done as a single atomic operation. The atomicity guarantees that the new value is calculated based on up-to-date information; if the value had been updated by another thread in the meantime, the write would fail. The result of the operation must indicate whether it performed the substitution; this can be done either with a simple boolean response (this variant is often called compare-and-set), or by returning the value read from the memory location (not the value written to it).