Editing Memory barrier (section)

==Multithreaded programming and memory visibility==
{{See also|Memory model (programming)}}

Multithreaded programs usually use synchronization primitives provided by a high-level programming environment—such as [[Java (programming language)|Java]] or [[.NET]]—or an [[application programming interface]] (API) such as POSIX Threads or [[Windows API]]. Synchronization primitives such as [[Mutual exclusion|mutexes]] and [[semaphore (programming)|semaphores]] are provided to synchronize access to resources from parallel threads of execution. These primitives are usually implemented with the memory barriers required to provide the expected memory visibility [[Semantics#Computer science|semantics]]. In such environments explicit use of memory barriers is not generally necessary.