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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Buffers;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Threading;
namespace System.MemoryTests
{
public class CustomMemoryForTest<T> : OwnedMemory<T>
{
private bool _disposed;
private int _referenceCount;
private int _noReferencesCalledCount;
private T[] _array;
public CustomMemoryForTest(T[] array)
{
_array = array;
}
public int OnNoRefencesCalledCount => _noReferencesCalledCount;
public override int Length => _array.Length;
public override bool IsDisposed => _disposed;
protected override bool IsRetained => _referenceCount > 0;
public override Span<T> Span
{
get
{
if (IsDisposed)
throw new ObjectDisposedException(nameof(CustomMemoryForTest<T>));
return new Span<T>(_array, 0, _array.Length);
}
}
public override MemoryHandle Pin(int byteOffset = 0)
{
unsafe
{
Retain();
if (byteOffset < 0 || (byteOffset/Unsafe.SizeOf<T>()) > _array.Length) throw new ArgumentOutOfRangeException(nameof(byteOffset));
var handle = GCHandle.Alloc(_array, GCHandleType.Pinned);
return new MemoryHandle(this, Unsafe.Add<byte>((void*)handle.AddrOfPinnedObject(), byteOffset), handle);
}
}
protected override bool TryGetArray(out ArraySegment<T> arraySegment)
{
if (IsDisposed)
throw new ObjectDisposedException(nameof(CustomMemoryForTest<T>));
arraySegment = new ArraySegment<T>(_array);
return true;
}
protected override void Dispose(bool disposing)
{
if (_disposed)
return;
if (disposing)
{
_array = null;
}
_disposed = true;
}
public override void Retain()
{
if (IsDisposed)
throw new ObjectDisposedException(nameof(CustomMemoryForTest<T>));
Interlocked.Increment(ref _referenceCount);
}
public override bool Release()
{
int newRefCount = Interlocked.Decrement(ref _referenceCount);
if (newRefCount < 0)
throw new InvalidOperationException();
if (newRefCount == 0)
{
_noReferencesCalledCount++;
return false;
}
return true;
}
}
}
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