Replace AsyncLock with SemaphoreSlim

src/.editorconfig

@@ -5,6 +5,11 @@ root = false
 # Code files
 [*.cs]
 
+# Design rules
+
+# CA1001: Types that own disposable fields should be disposable
+dotnet_diagnostic.CA1001.severity = error
+
 # Globalization rules
 
 # CA1303: Do not pass literals as localized parameters

src/EFCore/ValueGeneration/HiLoValueGeneratorState.cs

@@ -15,9 +15,9 @@ namespace Microsoft.EntityFrameworkCore.ValueGeneration
     /// <summary>
     ///     The thread safe state used by <see cref="HiLoValueGenerator{TValue}" />.
     /// </summary>
-    public class HiLoValueGeneratorState
+    public class HiLoValueGeneratorState : IDisposable
     {
-        private readonly AsyncLock _asyncLock = new AsyncLock();
+        private readonly SemaphoreSlim _semaphoreSlim = new SemaphoreSlim(1);
         private HiLoValue _currentValue;
         private readonly int _blockSize;
 
@@ -58,7 +58,8 @@ public virtual TValue Next<TValue>([NotNull] Func<long> getNewLowValue)
             // gets a chance to use the new value, so use a while here to do it all again.
             while (newValue.Low >= newValue.High)
             {
-                using (_asyncLock.Lock())
+                _semaphoreSlim.Wait();
+                try
                 {
                     // Once inside the lock check to see if another thread already got a new block, in which
                     // case just get a value out of the new block instead of requesting one.
@@ -73,6 +74,10 @@ public virtual TValue Next<TValue>([NotNull] Func<long> getNewLowValue)
                         newValue = GetNextValue();
                     }
                 }
+                finally
+                {
+                    _semaphoreSlim.Release();
+                }
             }
 
             return ConvertResult<TValue>(newValue);
@@ -100,7 +105,8 @@ public virtual async ValueTask<TValue> NextAsync<TValue>(
             // gets a chance to use the new value, so use a while here to do it all again.
             while (newValue.Low >= newValue.High)
             {
-                using (await _asyncLock.LockAsync(cancellationToken).ConfigureAwait(false))
+                await _semaphoreSlim.WaitAsync(cancellationToken).ConfigureAwait(false);
+                try
                 {
                     // Once inside the lock check to see if another thread already got a new block, in which
                     // case just get a value out of the new block instead of requesting one.
@@ -115,6 +121,10 @@ public virtual async ValueTask<TValue> NextAsync<TValue>(
                         newValue = GetNextValue();
                     }
                 }
+                finally
+                {
+                    _semaphoreSlim.Release();
+                }
             }
 
             return ConvertResult<TValue>(newValue);
@@ -152,5 +162,10 @@ public HiLoValue(long low, long high)
             public HiLoValue NextValue()
                 => new HiLoValue(Low + 1, High);
         }
+
+        /// <summary>
+        ///     Releases the allocated resources for this instance.
+        /// </summary>
+        public virtual void Dispose() => _semaphoreSlim.Dispose();
     }
 }