From 62889adfde94710f280868c1b7dc4be4cc8cc229 Mon Sep 17 00:00:00 2001
From: Exzap <13877693+Exzap@users.noreply.github.com>
Date: Fri, 8 Sep 2023 07:04:28 +0200
Subject: [PATCH] Use memory barriers in Linux fiber implementation

Prevent compilers from caching TLS variables across swapcontext calls
---
 src/util/Fiber/FiberUnix.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/util/Fiber/FiberUnix.cpp b/src/util/Fiber/FiberUnix.cpp
index 7d3bf05a..0d527069 100644
--- a/src/util/Fiber/FiberUnix.cpp
+++ b/src/util/Fiber/FiberUnix.cpp
@@ -1,5 +1,6 @@
 #include "Fiber.h"
 #include <ucontext.h>
+#include <atomic>
 
 thread_local Fiber* sCurrentFiber{};
 
@@ -44,7 +45,9 @@ void Fiber::Switch(Fiber& targetFiber)
 {
     Fiber* leavingFiber = sCurrentFiber;
     sCurrentFiber = &targetFiber;
+	std::atomic_thread_fence(std::memory_order_seq_cst);
 	swapcontext((ucontext_t*)(leavingFiber->m_implData), (ucontext_t*)(targetFiber.m_implData));
+	std::atomic_thread_fence(std::memory_order_seq_cst);
 }
 
 void* Fiber::GetFiberPrivateData()