From 0605ba282442c02bfaf8a6e4673b50a376e026c8 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@gmail.com>
Date: Sun, 26 Jan 2020 18:55:40 +0100
Subject: [PATCH] threading/Queue: lock mutex before notifying the
 condition_variable

Locking the associated mutex is not strictly mandatory, but not doing
so can easily create race conditions and lockups.
---
 src/threading/Queue.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/threading/Queue.h b/src/threading/Queue.h
index 4c3453d0c8..ad59f15268 100644
--- a/src/threading/Queue.h
+++ b/src/threading/Queue.h
@@ -255,7 +255,10 @@ template<typename T>
 inline void Queue<T>::WakeUp()
 	{
 	for ( int i = 0; i < NUM_QUEUES; i++ )
+		{
+		auto lock = acquire_lock(mutex[i]);
 		has_data[i].notify_all();
+		}
 	}
 
 }