Improve .NET 9.0+ locking performance (#30)

Author: gehongyan

src/Kook.Net.Commands/Map/CommandMapNode.cs

@@ -9,7 +9,11 @@ internal class CommandMapNode
 
     private readonly ConcurrentDictionary<string, CommandMapNode> _nodes;
     private readonly string _name;
+#if NET9_0_OR_GREATER
+    private readonly Lock _lockObj = new();
+#else
     private readonly object _lockObj = new();
+#endif
     private ImmutableArray<CommandInfo> _commands;
 
     // ReSharper disable InconsistentlySynchronizedField

src/Kook.Net.Core/Utils/AsyncEvent.cs

@@ -5,7 +5,11 @@ namespace Kook;
 internal class AsyncEvent<T>
     where T : class
 {
+#if NET9_0_OR_GREATER
+    private readonly Lock _subLock = new();
+#else
     private readonly object _subLock = new();
+#endif
     internal ImmutableArray<T> _subscriptions = [];
 
     // ReSharper disable once InconsistentlySynchronizedField

src/Kook.Net.Rest/Net/Queue/RequestBucket.cs

@@ -11,7 +11,11 @@ internal class RequestBucket
 {
     private const int MinimumSleepTimeMs = 750;
 
-    private readonly object _lock;
+#if NET9_0_OR_GREATER
+    private readonly Lock _lock = new();
+#else
+    private readonly object _lock = new();
+#endif
     private readonly RequestQueue _queue;
     private int _semaphore;
     private DateTimeOffset? _resetTick;
@@ -32,8 +36,6 @@ public RequestBucket(RequestQueue queue, IRequest request, BucketId id)
         _queue = queue;
         Id = id;
 
-        _lock = new object();
-
         if (request.Options.IsClientBucket && request.Options.BucketId != null)
             WindowCount = ClientBucket.Get(request.Options.BucketId).WindowCount;
         else if (request.Options.IsGatewayBucket && request.Options.BucketId != null)

src/Kook.Net.WebSocket/Entities/Users/SocketGlobalUser.cs

@@ -6,7 +6,11 @@ namespace Kook.WebSocket;
 [DebuggerDisplay("{DebuggerDisplay,nq}")]
 internal sealed class SocketGlobalUser : SocketUser
 {
+#if NET9_0_OR_GREATER
+    private readonly Lock _lockObj = new();
+#else
     private readonly object _lockObj = new();
+#endif
     private ushort _references;
 
     /// <inheritdoc />