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   futex    ( 2 )

быстрая блокировка пользовательского пространства (fast user-space locking)
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Версии (Versions)

Futexes were first made available in a stable kernel release with
       Linux 2.6.0.


       Initial futex support was merged in Linux 2.5.7 but with
       different semantics from what was described above.  A four-
       argument system call with the semantics described in this page
       was introduced in Linux 2.5.40.  A fifth argument was added in
       Linux 2.5.70, and a sixth argument was added in Linux 2.6.7.