[GFX-309] 关闭连接时取消输出管道的挂起读取

src/GameFrameX.SuperSocket.Connection/PipeConnection.cs

@@ -262,5 +262,13 @@ protected override bool IsIgnorableException(Exception e)
         /// <param name="cancellationToken">A token to monitor for cancellation requests.</param>
         /// <returns>The total number of bytes read.</returns>
         protected abstract ValueTask<int> FillInputPipeWithDataAsync(Memory<byte> memory, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Cancels the pending read on the output pipe reader so the send loop unblocks immediately when the connection is being closed.
+        /// </summary>
+        protected override void CancelOutputPendingRead()
+        {
+            this.Output.Reader.CancelPendingRead();
+        }
     }
 }

src/GameFrameX.SuperSocket.Connection/PipeConnectionBase.cs

@@ -192,6 +192,7 @@ protected async Task CancelAsync()
 
             _cts.Cancel();
             await CompleteWriterAsync(OutputWriter, _isDetaching).ConfigureAwait(false);
+            CancelOutputPendingRead();
         }
 
         /// <summary>
@@ -579,6 +580,13 @@ protected virtual async ValueTask CompleteWriterAsync(PipeWriter writer, bool is
             await writer.CompleteAsync().ConfigureAwait(false);
         }
 
+        /// <summary>
+        /// Cancels the pending read on the output pipe reader so that the send loop (<see cref="PipeConnection.ProcessSends"/>) blocked on <c>ReadAsync</c> returns promptly during connection shutdown.
+        /// </summary>
+        protected virtual void CancelOutputPendingRead()
+        {
+        }
+
         internal struct BufferFilterResult<TPackageInfo>
         {
             public Exception Exception { get; set; }