futex(2) — Linux manual page - man7.org
网页A futex is a 32-bit value—referred to below as a futex word —whose address is supplied to the futex () system call. (Futexes are 32 bits in size on all platforms, including 64-bit systems.) All futex operations are governed by this value.
futex(2): fast user-space locking - Linux man page - Linux …
网页The futex() system call provides a method for a program to wait for a value at a given address to change, and a method to wake up anyone waiting on a particular address (while the addresses for the same memory in separate processes may not be equal, the kernel maps them internally so the same memory mapped in different locations will correspond ...
A futex overview and update - LWN.net
网页2009年11月11日 · The futex [PDF] mechanism, introduced in 2.5.7 by Rusty Russell, Hubertus Franke, and Mathew Kirkwood, is a fast, lightweight kernel-assisted locking primitive for user-space applications. It provides for …
Basics of Futexes - Eli Bendersky's website
网页2018年7月13日 · Simply stated, a futex is a kernel construct that helps userspace code synchronize on shared events. Some userspace processes (or threads) can wait on an event (FUTEX_WAIT), while another userspace process can signal the event (FUTEX_WAKE) to notify waiters.
futex(7) — Linux manual page - man7.org
网页DESCRIPTION top. The Linux kernel provides futexes ("Fast user-space mutexes") as a building block for fast user-space locking and semaphores. Futexes are very basic and lend themselves well for building higher-level locking abstractions such as mutexes, condition variables, read-write locks, barriers, and semaphores.
futex(4): Fast Userspace Locking - Linux man page - Linux …
网页The Linux kernel provides futexes ('Fast Userspace muTexes') as a building block for fast userspace locking and semaphores. Futexes are very basic and lend themselves well for building higher level locking abstractions such as POSIX mutexes.
futex2 — The Linux Kernel documentation
网页futex, or fast user mutex, is a set of syscalls to allow userspace to create performant synchronization mechanisms, such as mutexes, semaphores and conditional variables in userspace. C standard libraries, like glibc, uses it as a means to implement more high level interfaces like pthreads.
A description of what robust futexes are - Kernel
网页To answer that, we first need to understand what futexes are: normal futexes are special types of locks that in the noncontended case can be acquired/released from userspace without having to enter the kernel. A futex is in essence a user-space address, e.g. a 32-bit lock variable field.
Lightweight PI-futexes — The Linux Kernel documentation
网页Lightweight PI-futexes. ¶. We are calling them lightweight for 3 reasons: in the user-space fastpath a PI-enabled futex involves no kernel work (or any other PI complexity) at all. No registration, no extra kernel calls - just pure fast atomic ops in userspace.
Landing a new syscall: What is futex? - Collabora
网页2022年2月8日 · A followup of the initial futex syscall, this new interface aims to overcome long term issues that have been limiting the way applications use the Linux kernel. But what exactly is futex? This series of blog posts will help answer that and other questions around this tricky function.
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