Added SemaphoreSlim extension methods

DeveCoolLib/Threading/SemaphoreSlimExtensions.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DeveCoolLib.Threading
+{
+    public static class SemaphoreSlimExtensions
+    {
+        public static async Task RunAsync(this SemaphoreSlim semaphore, Func<Task> action, CancellationToken cancellationToken = default)
+        {
+            await semaphore.WaitAsync(cancellationToken);
+
+            try
+            {
+                await action();
+            }
+            finally
+            {
+                semaphore.Release();
+            }
+        }
+
+        public static SemaphoreDisposer DisposableWait(this SemaphoreSlim semaphore, CancellationToken cancellationToken = default)
+        {
+            semaphore.Wait(cancellationToken);
+            return new SemaphoreDisposer(semaphore);
+        }
+
+        public static async Task<SemaphoreDisposer> DisposableWaitAsync(this SemaphoreSlim semaphore, CancellationToken cancellationToken = default)
+        {
+            await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
+            return new SemaphoreDisposer(semaphore);
+        }
+
+        public struct SemaphoreDisposer : IDisposable
+        {
+            private readonly SemaphoreSlim _semaphore;
+
+            public SemaphoreDisposer(SemaphoreSlim semaphore)
+            {
+                _semaphore = semaphore;
+            }
+
+            public void Dispose()
+            {
+                _semaphore.Release();
+            }
+        }
+    }
+}