Use System.Lock instead of object for locking

Orm/Xtensive.Orm.Oracle/Sql.Drivers.Oracle/v09/Extractor.cs

@@ -106,7 +106,7 @@ public ExtractionContext(Catalog catalog, Dictionary<string, string> replacement
     private const int DefaultDayPrecision = 2;
     private const int DefaultFSecondsPrecision = 6;
 
-    private readonly object accessGuard = new object();
+    private readonly Lock accessGuard = new();
 
     private string nonSystemSchemasFilter;
 

Orm/Xtensive.Orm.Sqlite/Sql.Drivers.Sqlite/ProviderInitializer.cs

@@ -27,7 +27,7 @@ internal static class ProviderInitializer
     private const string FrameworkName = "Net40";
 
     private static volatile bool IsInitialized;
-    private static readonly object SyncRoot = new object();
+    private static readonly Lock SyncRoot = new();
 
     public static void Run(string nativeLibraryCacheFolder)
     {

Orm/Xtensive.Orm.Tests.Core/DotNetFramework/ThreadingTest.cs

@@ -26,7 +26,7 @@ private class Target
       public int PassCount;
       public bool Stop;
       public Thread LastAccessor;
-      public object ObjectLock = new object();
+      public Lock ObjectLock = new();
       public ReaderWriterLockSlim SlimLock = new ReaderWriterLockSlim();
 
       public void ExecuteLock(object argument)
@@ -280,4 +280,4 @@ private static void ThreadedTest(Target target, int passCount, ParameterizedThre
       TestHelper.CollectGarbage();
     }
   }
-}
+}

Orm/Xtensive.Orm.Tests.Framework/StorageProviderInfo.cs

@@ -12,7 +12,7 @@ namespace Xtensive.Orm.Tests
 {
   public sealed class StorageProviderInfo
   {
-    private static readonly object InstanceLock = new object();
+    private static readonly Lock InstanceLock = new();
     private static StorageProviderInfo InstanceValue;
 
     public static StorageProviderInfo Instance
@@ -113,4 +113,4 @@ private static IStorageTimeZoneProvider GetTimeZoneProvider(StorageProvider prov
       }
     }
   }
-}
+}

Orm/Xtensive.Orm.Tests.Framework/TestConfiguration.cs

@@ -19,7 +19,7 @@ public sealed class TestConfiguration
 
     private const string DefaultStorage = "default";
 
-    private static readonly object InstanceLock = new object();
+    private static readonly Lock InstanceLock = new();
     private static TestConfiguration InstanceValue;
 
     private readonly Dictionary<string, string> configuration;
@@ -103,4 +103,4 @@ private TestConfiguration()
       Storage = GetEnvironmentVariable(StorageKey) ?? GetStorageFromFile() ?? DefaultStorage;
     }
   }
-}
+}

Orm/Xtensive.Orm.Tests/Issues/Issue0676_NonNullableReferenceBug.cs

@@ -61,7 +61,7 @@ private sealed class KeyExtension
     #region "Null entity" pattern implementation
 
     public const string NullName = "<None>";
-    private static object @lock = new object();
+    private static Lock @lock = new();
 
     public static Person Null { 
       get {
@@ -190,4 +190,4 @@ public void HasNullEntityTest()
       }
     }
   }
-}
+}

Orm/Xtensive.Orm.Tests/Issues/Issue0839_MultithreadingBug.cs

@@ -45,7 +45,7 @@ public class Issue0839_MultithreadingBug : AutoBuildTest
     private const int entityCount = 20;
     private const int readCount = 20;
 
-    private static object exceptionLock = new object();
+    private static Lock exceptionLock = new();
     private static int exceptionCount;
     private static Key[] keys = new Key[entityCount];
 
@@ -136,4 +136,4 @@ currentError is UniqueConstraintViolationException ||
       }
     }
   }
-}
+}

Orm/Xtensive.Orm.Tests/Storage/ActivatorTest.cs

@@ -5,11 +5,12 @@
 // Created:    2008.06.11
 
 using System;
+using System.Linq;
 using System.Reflection;
 using NUnit.Framework;
 using Xtensive.Orm.Configuration;
+using Xtensive.Orm.Tests.Issues.CustomerBug1Model;
 using Xtensive.Orm.Tests.Storage.ActivatorModel;
-using System.Linq;
 
 namespace Xtensive.Orm.Tests.Storage.ActivatorModel
 {
@@ -32,19 +33,19 @@ public class Descendant : Ancestor
   [HierarchyRoot]
   public class InitializebleClass : Entity
   {
-    public object syncRoot = new object();
+    public Lock syncRoot = new();
 
     protected override void OnInitialize()
     {
       base.OnInitialize();
-      syncRoot = new object();
+      syncRoot = new();
     }
 
     public InitializebleClass()
     {
-      syncRoot = new object();
-      // ������, ������� ����� syncRoot.
-      Assert.IsNotNull(syncRoot);
+      syncRoot = new();
+      // Логика, которая юзает syncRoot.
+      Assert.That(syncRoot != null, Is.True);
     }
 
     [Field, Key]
@@ -75,7 +76,7 @@ public void TestFieldInitializer()
         using (var t = session.OpenTransaction())
         {
           var obj1 = new  InitializebleClass();
-          Assert.IsNotNull(obj1.syncRoot);
+          Assert.That(obj1.syncRoot != null, Is.True);
           t.Complete();
         }
       }
@@ -85,7 +86,7 @@ public void TestFieldInitializer()
         {
           var obj1 = session.Query.All<InitializebleClass>().First();
           Assert.IsNotNull(obj1);
-          Assert.IsNotNull(obj1.syncRoot);
+          Assert.That(obj1.syncRoot != null, Is.True);
           t.Complete();
         }
       }
@@ -113,4 +114,4 @@ public void Test()
       }
     }
   }
-}
+}

Orm/Xtensive.Orm.Tests/Upgrade/UpgradeAndNamingRulesAdvanced/TestBase.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2016 Xtensive LLC.
+// Copyright (C) 2016 Xtensive LLC.
 // All rights reserved.
 // For conditions of distribution and use, see license.
 // Created by: Alexey Kulakov
@@ -20,7 +20,7 @@ namespace Xtensive.Orm.Tests.Upgrade.UpgradeAndNamingRulesAdvanced
   [TestFixture]
   public abstract class TestBase
   {
-    public readonly object guard = new object();
+    public readonly Lock guard = new();
     private NamingConvention namingConvention;
 
     [Test]

Orm/Xtensive.Orm/Core/AssociateProvider.cs

@@ -43,7 +43,7 @@ public abstract class AssociateProvider :
     private string[] typeSuffixes;
 
     [NonSerialized]
-    private object highPriorityLocationsLock = new object();
+    private Lock highPriorityLocationsLock = new();
 
     private List<(Assembly, string)> highPriorityLocations = new();
 

Orm/Xtensive.Orm/Core/Scope.cs

@@ -21,7 +21,7 @@ namespace Xtensive.Core
   public class Scope<TContext> : IDisposable
     where TContext: class
   {
-    internal static readonly object @lock = new object();
+    internal static readonly Lock @lock = new();
     internal static volatile Type allowedType = null;
 
     private static readonly AsyncLocal<Scope<TContext>> currentScopeAsync = new AsyncLocal<Scope<TContext>>();

Orm/Xtensive.Orm/Core/SimpleScope.cs

@@ -19,7 +19,7 @@ namespace Xtensive.Core
   /// <typeparam name="TVariator">The type of the variator. Must be an internal type.</typeparam>
   public class SimpleScope<TVariator> : IDisposable
   {
-    private readonly static object @lock = new object();
+    private readonly static Lock @lock = new();
     private volatile static Type allowedType = null;
 
     private static readonly AsyncLocal<SimpleScope<TVariator>> currentAsync = new AsyncLocal<SimpleScope<TVariator>>();
@@ -117,4 +117,4 @@ public void Dispose()
         throw error;
     }
   }
-}
+}

Orm/Xtensive.Orm/Orm/Domain.cs

@@ -38,8 +38,8 @@ namespace Xtensive.Orm
   [UsedImplicitly(ImplicitUseTargetFlags.WithMembers)]
   public sealed class Domain : IDisposable, IAsyncDisposable, IHasExtensions, ISessionSource
   {
-    private readonly object disposeGuard = new object();
-    private readonly object singleConnectionGuard = new object();
+    private readonly Lock disposeGuard = new();
+    private readonly Lock singleConnectionGuard = new();
 
     private bool isDisposed;
     private Session singleConnectionOwner;

Orm/Xtensive.Orm/Orm/Logging/Internals/FileWriter.cs

@@ -11,7 +11,7 @@ namespace Xtensive.Orm.Logging
   internal sealed class FileWriter : LogWriter
   {
     private readonly string fileName;
-    private readonly object syncRoot = new object();
+    private readonly Lock syncRoot = new();
 
     /// <inheritdoc/>
     public override void Write(in LogEventInfo logEvent)

Orm/Xtensive.Orm/Orm/Logging/Internals/SystemClock.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2013 Xtensive LLC.
+// Copyright (C) 2013 Xtensive LLC.
 // All rights reserved.
 // For conditions of distribution and use, see license.
 // Created by: Alexey Kulakov
@@ -10,7 +10,7 @@ namespace Xtensive.Orm.Logging
 {
   internal static class SystemClock
   {
-    private static readonly object syncRoot = new object();
+    private static readonly Lock syncRoot = new();
     private static int lastTick = -1;
     private static DateTime lastDateTime = DateTime.MinValue;
 

Orm/Xtensive.Orm/Orm/Logging/LogManager.cs

@@ -18,7 +18,7 @@ public sealed class LogManager
   {
     private static readonly LogManager defaultInstance = new LogManager();
 
-    private readonly object syncObj = new object();
+    private readonly Lock syncObj = new();
     private LogProvider provider;
 
     /// <summary>

Orm/Xtensive.Orm/Orm/Upgrade/Internals/UpgradeServiceAccessor.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2012 Xtensive LLC.
+// Copyright (C) 2012 Xtensive LLC.
 // All rights reserved.
 // For conditions of distribution and use, see license.
 // Created by: Denis Krjuchkov
@@ -17,7 +17,7 @@ namespace Xtensive.Orm.Upgrade
 {
   internal sealed class UpgradeServiceAccessor : LockableBase, IDisposable
   {
-    private readonly object resourcesSyncRoot = new object();
+    private readonly Lock resourcesSyncRoot = new();
     private readonly DisposableSet resources = new DisposableSet();
     private readonly DisposableSet temporaryResources = new DisposableSet();
 
@@ -177,4 +177,4 @@ public void Dispose()
       }
     }
   }
-}
+}

Orm/Xtensive.Orm/Reflection/TypeHelper.cs

@@ -42,7 +42,7 @@ public int GetHashCode((Type, Type[]) obj)
 
     private const string InvokeMethodName = "Invoke";
 
-    private static readonly object EmitLock = new object();
+    private static readonly Lock EmitLock = new();
     private static readonly int NullableTypeMetadataToken = WellKnownTypes.NullableOfT.MetadataToken;
     private static readonly int ValueTuple1MetadataToken = typeof(ValueTuple<>).MetadataToken;
     private static readonly int ValueTuple8MetadataToken = typeof(ValueTuple<,,,,,,,>).MetadataToken;