From 77548d14db6c979a380203a1fd8a7de8b61cde5e Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Wed, 20 Sep 2017 19:59:34 -0400
Subject: [PATCH] Ensures self.bounds and -convertSizeToBacking: are called
 only on the main queue.

---
 OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m b/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m
index 0e6330dcc..1a9d87ed8 100644
--- a/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m	
+++ b/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m	
@@ -15,6 +15,7 @@
 
 @implementation CSOpenGLView {
 	CVDisplayLinkRef _displayLink;
+	CGSize _backingSize;
 }
 
 - (void)prepareOpenGL
@@ -68,12 +69,17 @@ static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeSt
 
 - (CGSize)backingSize
 {
-	return [self convertSizeToBacking:self.bounds.size];
+	@synchronized(self) {
+		return _backingSize;
+	}
 }
 
 - (void)reshape
 {
 	[super reshape];
+	@synchronized(self) {
+		_backingSize = [self convertSizeToBacking:self.bounds.size];
+	}
 
 	[self performWithGLContext:^{
 		CGSize viewSize = [self backingSize];