From f7a58f99cedac087e467c6ebfe19720ac8ab9ad8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20M=C3=BCller?= <nexyon@gmail.com>
Date: Mon, 2 Jun 2025 16:41:22 +0200
Subject: [PATCH] Fix #139721: Audio: Blender hang on startup

Fix by Sergey Sharybin.
---
 extern/audaspace/src/devices/MixingThreadDevice.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/extern/audaspace/src/devices/MixingThreadDevice.cpp b/extern/audaspace/src/devices/MixingThreadDevice.cpp
index c6062b080cf..5677bf7ec89 100644
--- a/extern/audaspace/src/devices/MixingThreadDevice.cpp
+++ b/extern/audaspace/src/devices/MixingThreadDevice.cpp
@@ -89,7 +89,10 @@ MixingThreadDevice::MixingThreadDevice()
 
 void aud::MixingThreadDevice::stopMixingThread()
 {
-	m_valid = false;
+	{
+		std::unique_lock<std::mutex> lock(m_mixingLock);
+		m_valid = false;
+	}
 
 	m_mixingCondition.notify_all();