From 6126f2f62673b8823999a906b24e7d6e75da3279 Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Fri, 10 Aug 2018 20:19:11 -0400
Subject: [PATCH] Make a one-time dynamic check that atomic<double> doesn't use
 mutexes

---
 src/AudioIO.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/AudioIO.cpp b/src/AudioIO.cpp
index f7ccdae5c..85eec3c0e 100644
--- a/src/AudioIO.cpp
+++ b/src/AudioIO.cpp
@@ -1179,6 +1179,14 @@ bool AudioIO::ValidateDeviceNames(const wxString &play, const wxString &rec)
 
 AudioIO::AudioIO()
 {
+   if (!std::atomic<double>{}.is_lock_free()) {
+      // If this check fails, then the atomic<double> members in AudioIO.h
+      // might be changed to atomic<float> to be more efficient with some
+      // loss of precision.  That could be conditionally compiled depending
+      // on the platform.
+      wxASSERT(false);
+   }
+
    mAudioThreadShouldCallFillBuffersOnce = false;
    mAudioThreadFillBuffersLoopRunning = false;
    mAudioThreadFillBuffersLoopActive = false;