public sealed override MemoryHandle Pin(int elementIndex = 0)
{
unsafe
{
while (true)
{
int currentCount = Volatile.Read(ref _refCount);
if (currentCount <= 0)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
if (Interlocked.CompareExchange(ref _refCount, currentCount + 1, currentCount) == currentCount)
{
break;
}
}
try
{
if ((uint)elementIndex > (uint)_array.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.elementIndex);
}
GCHandle handle = GCHandle.Alloc(_array, GCHandleType.Pinned);
return(new MemoryHandle(Unsafe.Add <T>(((void *)handle.AddrOfPinnedObject()), elementIndex), handle, this));
}
catch
{
Unpin();
throw;
}
}
}
public sealed override Span <T> GetSpan()
{
if (IsDisposed)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
return(_array);
}
public sealed override void Retain()
{
if (IsDisposed)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
_refCount++;
}
sealed override bool TryGetArray(out ArraySegment <T> arraySegment)
{
if (IsDisposed)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
arraySegment = new ArraySegment <T>(_array);
return(true);
}
public sealed override void Retain()
{
while (true)
{
int currentCount = Volatile.Read(ref _refCount);
if (currentCount <= 0)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
if (Interlocked.CompareExchange(ref _refCount, currentCount + 1, currentCount) == currentCount)
{
break;
}
}
}
public sealed override bool Release()
{
if (IsDisposed)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
int newRefCount = --_refCount;
if (newRefCount < 0)
{
ThrowHelper.ThrowInvalidOperationException();
}
return(newRefCount != 0);
}
public sealed override bool Release()
{
while (true)
{
int currentCount = Volatile.Read(ref _refCount);
if (currentCount <= 0)
{
ThrowHelper.ThrowObjectDisposedException_ArrayMemoryPoolBuffer();
}
if (Interlocked.CompareExchange(ref _refCount, currentCount - 1, currentCount) == currentCount)
{
if (currentCount == 1)
{
Dispose();
return(false);
}
return(true);
}
}
}
