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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.Diagnostics;
using System.Runtime.InteropServices;
namespace System.Buffers
{
internal sealed class NativeOwnedMemory : OwnedMemory<byte>
{
private readonly int _length;
private IntPtr _ptr;
private int _retainedCount;
private bool _disposed;
public NativeOwnedMemory(int length)
{
_length = length;
_ptr = Marshal.AllocHGlobal(length);
}
~NativeOwnedMemory()
{
Debug.WriteLine($"{nameof(NativeOwnedMemory)} being finalized");
Dispose(false);
}
public override bool IsDisposed
{
get
{
lock (this)
{
return _disposed && _retainedCount == 0;
}
}
}
public override int Length => _length;
protected override bool IsRetained
{
get
{
lock (this)
{
return _retainedCount > 0;
}
}
}
public override unsafe Span<byte> Span => new Span<byte>((void*)_ptr, _length);
public override unsafe MemoryHandle Pin(int offset = 0)
{
if (offset < 0 || offset > _length) throw new ArgumentOutOfRangeException(nameof(offset));
void* pointer = (void*)((byte*)_ptr + offset);
return new MemoryHandle(this, pointer);
}
public override bool Release()
{
lock (this)
{
if (_retainedCount > 0)
{
_retainedCount--;
if (_retainedCount == 0)
{
if (_disposed)
{
Marshal.FreeHGlobal(_ptr);
_ptr = IntPtr.Zero;
}
return true;
}
}
}
return false;
}
public override void Retain()
{
lock (this)
{
if (_retainedCount == 0 && _disposed)
{
throw new Exception();
}
_retainedCount++;
}
}
protected override void Dispose(bool disposing)
{
lock (this)
{
_disposed = true;
if (_retainedCount == 0)
{
Marshal.FreeHGlobal(_ptr);
_ptr = IntPtr.Zero;
}
}
}
protected override bool TryGetArray(out ArraySegment<byte> arraySegment)
{
arraySegment = default(ArraySegment<byte>);
return false;
}
}
}
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