Use the new more efficient .NET 9 Lock type (#18015)

src/Umbraco.Web.Common/Localization/DynamicRequestCultureProviderBase.cs

@@ -12,8 +12,8 @@ namespace Umbraco.Cms.Web.Common.Localization;
 public abstract class DynamicRequestCultureProviderBase : RequestCultureProvider
 {
     private readonly RequestLocalizationOptions _options;
-    private readonly object _lockerSupportedCultures = new();
-    private readonly object _lockerSupportedUICultures = new();
+    private readonly Lock _lockerSupportedCultures = new();
+    private readonly Lock _lockerSupportedUICultures = new();
 
     /// <summary>
     /// Initializes a new instance of the <see cref="DynamicRequestCultureProviderBase" /> class.
@@ -66,7 +66,7 @@ public abstract class DynamicRequestCultureProviderBase : RequestCultureProvider
     /// <param name="cultures">The cultures.</param>
     /// <param name="locker">The locker object to use.</param>
     /// <param name="addAction">The add action to execute.</param>
-    private static void TryAddLocked(IEnumerable<CultureInfo>? supportedCultures, IEnumerable<StringSegment> cultures, object locker, Action<StringSegment> addAction)
+    private static void TryAddLocked(IEnumerable<CultureInfo>? supportedCultures, IEnumerable<StringSegment> cultures, Lock locker, Action<StringSegment> addAction)
     {
         foreach (StringSegment culture in cultures)
         {

src/Umbraco.Web.Common/Logging/RegisteredReloadableLogger.cs

@@ -11,7 +11,7 @@ namespace Umbraco.Cms.Web.Common.Logging;
 /// </remarks>
 internal class RegisteredReloadableLogger
 {
-    private static readonly object _frozenLock = new();
+    private static readonly Lock _frozenLock = new();
     private static bool _frozen;
     private readonly ReloadableLogger _logger;
 

src/Umbraco.Web.Common/ModelsBuilder/InMemoryAuto/CollectibleRuntimeViewCompiler.cs

@@ -20,7 +20,7 @@ namespace Umbraco.Cms.Web.Common.ModelsBuilder.InMemoryAuto;
 
 internal class CollectibleRuntimeViewCompiler : IViewCompiler
 {
-    private readonly object _cacheLock = new object();
+    private readonly Lock _cacheLock = new();
     private readonly Dictionary<string, CompiledViewDescriptor> _precompiledViews;
     private readonly ConcurrentDictionary<string, string> _normalizedPathCache;
     private readonly IFileProvider _fileProvider;

src/Umbraco.Web.Common/ModelsBuilder/InMemoryAuto/InMemoryModelFactory.cs

@@ -162,7 +162,7 @@ namespace Umbraco.Cms.Web.Common.ModelsBuilder.InMemoryAuto
         public Assembly? CurrentModelsAssembly { get; private set; }
 
         /// <inheritdoc />
-        public object SyncRoot { get; } = new object();
+        public object SyncRoot { get; } = new();
 
         private UmbracoServices UmbracoServices => _umbracoServices.Value;
 

src/Umbraco.Web.Common/Routing/RoutableDocumentFilter.cs

@@ -21,7 +21,7 @@ public sealed class RoutableDocumentFilter : IRoutableDocumentFilter
     private readonly GlobalSettings _globalSettings;
     private readonly IHostingEnvironment _hostingEnvironment;
     private readonly ConcurrentDictionary<string, bool> _routeChecks = new(StringComparer.OrdinalIgnoreCase);
-    private readonly object _routeLocker = new();
+    private readonly Lock _routeLocker = new();
     private readonly WebRoutingSettings _routingSettings;
     private object _initLocker = new();
     private bool _isInit;

src/Umbraco.Web.Common/Security/BackofficeSecurity.cs

@@ -10,7 +10,7 @@ namespace Umbraco.Cms.Web.Common.Security;
 
 public class BackOfficeSecurity : IBackOfficeSecurity
 {
-    private readonly object _currentUserLock = new();
+    private readonly Lock _currentUserLock = new();
     private readonly IHttpContextAccessor _httpContextAccessor;
     private readonly IUserService _userService;
     private IUser? _currentUser;