From d8e07dca913fb7068052bc724ded92889bf0199f Mon Sep 17 00:00:00 2001
From: Tom Poole <thomas.poole@roli.com>
Date: Fri, 28 Jun 2019 10:13:06 +0100
Subject: [PATCH] Fixed a data race in an example

---
 .../gui/juce_AudioVisualiserComponent.cpp                 | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/modules/juce_audio_utils/gui/juce_AudioVisualiserComponent.cpp b/modules/juce_audio_utils/gui/juce_AudioVisualiserComponent.cpp
index a13a489937..35714a3dcd 100644
--- a/modules/juce_audio_utils/gui/juce_AudioVisualiserComponent.cpp
+++ b/modules/juce_audio_utils/gui/juce_AudioVisualiserComponent.cpp
@@ -55,8 +55,10 @@ struct AudioVisualiserComponent::ChannelInfo
     {
         if (--subSample <= 0)
         {
-            nextSample %= levels.size();
-            levels.getReference (nextSample++) = value;
+            if (++nextSample == levels.size())
+                nextSample = 0;
+
+            levels.getReference (nextSample) = value;
             subSample = owner.getSamplesPerBlock();
             value = Range<float> (newSample, newSample);
         }
@@ -78,7 +80,7 @@ struct AudioVisualiserComponent::ChannelInfo
     AudioVisualiserComponent& owner;
     Array<Range<float>> levels;
     Range<float> value;
-    int nextSample = 0, subSample = 0;
+    std::atomic<int> nextSample { 0 }, subSample { 0 };
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ChannelInfo)
 };