From e761c0395d411aadc40e565f8deeff43c641c4a6 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 2 Nov 2022 14:47:56 +0900
Subject: [PATCH] Fix multiple notifications arriving for imports in edge cases

---
 osu.Game/Overlays/Notifications/ProgressNotification.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/osu.Game/Overlays/Notifications/ProgressNotification.cs b/osu.Game/Overlays/Notifications/ProgressNotification.cs
index 4cf47013bd..7b62c95179 100644
--- a/osu.Game/Overlays/Notifications/ProgressNotification.cs
+++ b/osu.Game/Overlays/Notifications/ProgressNotification.cs
@@ -148,7 +148,7 @@ namespace osu.Game.Overlays.Notifications
             }
         }
 
-        private bool completionSent;
+        private int completionSent;
 
         /// <summary>
         /// Attempt to post a completion notification.
@@ -162,11 +162,11 @@ namespace osu.Game.Overlays.Notifications
             if (CompletionTarget == null)
                 return;
 
-            if (completionSent)
+            // Thread-safe barrier, as this may be called by a web request and also scheduled to the update thread at the same time.
+            if (Interlocked.Increment(ref completionSent) == 0)
                 return;
 
             CompletionTarget.Invoke(CreateCompletionNotification());
-            completionSent = true;
 
             Close(false);
         }