[Ide] Guard against multiple IBeamCursorImage calls.

1 files changed, 19 insertions, 13 deletions

diff --git a/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/OSXEditor.cs b/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/OSXEditor.cs
index 94beeedc4f..5e97624536 100644
--- a/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/OSXEditor.cs
+++ b/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/OSXEditor.cs
@@ -34,24 +34,30 @@ namespace MonoDevelop.Ide.Editor
 {
 	class OSXEditor
 	{
+		static bool hasLoaded;
 		static Xwt.Drawing.Image image;
+		static object loadLock = new object ();
 
 		public static Xwt.Drawing.Image IBeamCursorImage {
 			get {
-				if (image != null)
-					return image;
-				try {
-					var cacheFileName = Path.Combine(UserProfile.Current.CacheDir, "MacCursorImage.tiff");
-					if (!File.Exists(cacheFileName)) {
-							NSCursor.IBeamCursor.Image.AsTiff().Save(cacheFileName, true);
+				lock (loadLock) {
+					if (hasLoaded)
+						return image;
+					try {
+						var cacheFileName = Path.Combine (UserProfile.Current.CacheDir, "MacCursorImage.tiff");
+						if (!File.Exists (cacheFileName)) {
+							NSCursor.IBeamCursor.Image.AsTiff ().Save (cacheFileName, true);
+						}
+						var img = Xwt.Drawing.Image.FromFile (cacheFileName);
+						var size = NSCursor.IBeamCursor.Image.Size;
+						image = img.WithSize (size.Width, size.Height);
+						return image;
+					} catch (Exception e) {
+						LoggingService.LogError ("Error while getting IBeam cursor image.", e);
+						return null;
+					} finally {
+						hasLoaded = true;
 					}
-					var img = Xwt.Drawing.Image.FromFile(cacheFileName);
-					var size = NSCursor.IBeamCursor.Image.Size;
-					image = img.WithSize(size.Width, size.Height);
-					return image;
-				} catch (Exception e) {
-					LoggingService.LogError("Error while getting IBeam cursor image.", e);
-					return null;
 				}
 			}
 		}