From 256f4a6679ce4bd2cfccc66951fe716477d26382 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 2 Feb 2020 21:29:22 -0500
Subject: [PATCH] Fixes -invalidate: cancel the dispatch source, don't just
 suspend it, and wait until that is done.

---
 .../High Precision Timer/CSHighPrecisionTimer.m        | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/OSBindings/Mac/Clock Signal/High Precision Timer/CSHighPrecisionTimer.m b/OSBindings/Mac/Clock Signal/High Precision Timer/CSHighPrecisionTimer.m
index 0947e5620..46a233a22 100644
--- a/OSBindings/Mac/Clock Signal/High Precision Timer/CSHighPrecisionTimer.m	
+++ b/OSBindings/Mac/Clock Signal/High Precision Timer/CSHighPrecisionTimer.m	
@@ -31,7 +31,15 @@
 }
 
 - (void)invalidate {
-	dispatch_suspend(_timer);
+	NSConditionLock *lock = [[NSConditionLock alloc] initWithCondition:0];
+
+	dispatch_source_set_cancel_handler(_timer, ^{
+		[lock lock];
+		[lock unlockWithCondition:1];
+	});
+
+	dispatch_source_cancel(_timer);
+	[lock lockWhenCondition:1];
 }
 
 @end