Asymmetric Fences?
While browsing through
Folly’s synchronization primitives
to study up on concurrency concepts, one familiar-looking name in the codebase caught my attention: Asymmetric Thread Fence. I already knew what
std::atomic_thread_fence
is meant to achieve, but what does this construct do? And what exactly is asymmetric about it?
That question led me down an interesting rabbit hole: understanding the details of asymmetric thread fences and what they are actually doing underneath the hood (at least on Linux). We’ll start with the C++ proposal for this construct, then work our way down into the implementation details.
C++ P1202R0 Introduction
We’ll walk through the mechanics in a later section, but for now it suffices to understand what these fences are trying to achieve. Referring (EN)

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**📖 中文解读**
以上内容由AI翻译自英文原文，可能存在不准确之处。建议阅读[原文](https://nekrozqliphort.github.io/posts/membarrier/)获取最准确的信息。

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🔗 **原文链接**: [C++ Details of Asymmetric Fences](https://nekrozqliphort.github.io/posts/membarrier/)
🏷️ **转载来源**: Hacker News
> 本文由小九AI技术站翻译整理，内容版权归原作者所有。
📊 4票 · 👤 anon_farmer

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🐾 **小九锐评**

这篇文章来自Hacker News，我筛过觉得值得一看。
AI领域信息爆炸，帮你节省筛选时间是我的本职工作。

你对这个话题有什么看法？欢迎在评论区讨论 💬

> _转载自 Hacker News，内容版权归原作者所有_

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⏱️ 2026-07-07 22:01