基于Futex的锁定机制
有人可以告诉我一个使用基于futex的锁定机制的例子吗？ （适用于多核 x86 CPU、CentOS）
Somebody can tell me an example of using locking mechanism based on futex? (for muticore x86 CPU, CentOS)
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Pthreads 的互斥体是在最新版本的 Linux 上使用 futexes 实现的。 Pthreads 是 Linux 上的标准 C 线程 API，并且是Posix 标准，因此您可以轻松地将程序移植到其他类 Unix 系统。除非您有非常不寻常的需求，否则您应该避免直接使用 futexes，因为它们很难正确使用 - 使用 pthreads 或更高级别的特定于语言的 API（几乎肯定会使用 pthreads 本身）。
Pthreads' mutexes are implemented using futexes on recent versions of Linux. Pthreads is the standard C threading API on Linux, and is part of the Posix standard, so you can easily port your program to other Unix-like systems. You should avoid using futexes directly unless you have very unusual needs, because they're very hard to use correctly - use pthreads, or a higher-level, language-specific API (which will almost certainly use pthreads itself).
看看https://github.com/avsm/ipc-bench。他们在共享内存管道实现中使用 futex。
具体可以查看这段代码。
Have a look at https://github.com/avsm/ipc-bench. They use futex in shared memory pipe implementation.
Specifically, you can check this code.
工作示例：pthreads 互斥体使用 futex 锁。
代码示例：这些是在 10 年这篇文章发表后的几个月内制作的，但仍然是最新的。
http://meta-meta.blogspot.com/2010 /11/linux-threading-primitives-futex.html
https://github.com/lcapaldo/futexexamples
用例示例：IPC 和进程间同步是这是为什么应该在用户空间使用 futex 的唯一例子。除极端情况外，pthread 互斥体适用于多线程，但多进程缺乏高性能的锁定机制和锁定类型。
working example: pthreads mutex use futex locks.
code example: These were made within months of this post in '10 but are still up-to-date.
http://meta-meta.blogspot.com/2010/11/linux-threading-primitives-futex.html
https://github.com/lcapaldo/futexexamples
use case example: IPC and inter-process synchronization are the only example of why one should use a futex in userspace. pthread mutexes will work for multi-thread except for extreme cases, but multi-process is lacking in high performance locking mechanisms as well as lock types.