Use SemaphoreSlim instead of Mutex for async locking

Author: Yosif-Smint

CloudinaryDotNet/FileDescription.cs

@@ -44,7 +44,7 @@ public class FileDescription : IDisposable
 
  private const int UnlimitedBuffer = int.MaxValue;
 
- private readonly Mutex mutex = new ();
+ private readonly SemaphoreSlim semaphoreSlim = new (1, 1);
 
  private readonly object chunkLock = new ();
 
@@ -290,7 +290,7 @@ public void AddChunk(Stream chunkStream, long startByte, long chunkSize, bool la
  public async Task<ChunkData> GetNextChunkAsync(CancellationToken? cancellationToken = null)
  {
  // lock this section, so we don't send the same chunk multiple times.
- mutex.WaitOne();
+ await semaphoreSlim.WaitAsync().ConfigureAwait(false);
  try
  {
  Stream resultingStream;
@@ -338,7 +338,7 @@ public async Task<ChunkData> GetNextChunkAsync(CancellationToken? cancellationTo
  }
  finally
  {
- mutex.ReleaseMutex();
+ semaphoreSlim.Release();
  }
  }
 
@@ -426,7 +426,7 @@ protected virtual void Dispose(bool disposing)
  chunks?.Dispose();
  chunks = null;
 
- mutex.Dispose();
+ semaphoreSlim.Dispose();
  }
 
  disposedValue = true;