From a546277f88fb50926b6f1cc0190b07adc5b91c3c Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sat, 19 Mar 2016 22:53:37 -0400
Subject: [PATCH] Added the simplest mechanism to decouple emulation from the
 display link queue.

---
 OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m b/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m
index edc816354..9e08fbd99 100644
--- a/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m	
+++ b/OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m	
@@ -12,6 +12,7 @@
 
 @implementation CSOpenGLView {
 	CVDisplayLinkRef _displayLink;
+	uint32_t _updateIsOngoing;
 }
 
 - (void)prepareOpenGL
@@ -51,9 +52,15 @@ static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeSt
 
 - (void)drawAtTime:(const CVTimeStamp *)now
 {
-	NSLog(@"%0.4f", (double)now->videoTime / (double)now->videoTimeScale);
-	[self.delegate openGLView:self didUpdateToTime:*now];
-	[self drawViewOnlyIfDirty:YES];
+	const uint32_t activityMask = 0x01;
+	if(!OSAtomicTestAndSet(activityMask, &_updateIsOngoing))
+	{
+		dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+			[self.delegate openGLView:self didUpdateToTime:*now];
+			[self drawViewOnlyIfDirty:YES];
+			OSAtomicTestAndClear(activityMask, &_updateIsOngoing);
+		});
+	}
 }
 
 - (void)invalidate