private void EnsureDevicePresent()
{
if (mDevice != null)
{
return;
}
DiagnosticsWriter.WriteInformation("Connecting to computation device");
var flags = mIsDebugModeEnabled
? DeviceCreationFlags.Debug
: DeviceCreationFlags.None;
if (flags.HasFlag(DeviceCreationFlags.Debug))
{
DiagnosticsWriter.WriteWarning("Computations are being run in debug mode. Performance will degrade.");
}
var adapterCount = mFactory.GetAdapterCount();
var error = (Exception)null;
for (var i = 0; i < adapterCount; i++)
{
var adapter = mFactory.GetAdapter(i);
var featureLevel = Device.GetSupportedFeatureLevel(adapter);
if (featureLevel < FeatureLevel.Level_11_0)
{
DiagnosticsWriter.WriteDebug("Skipping \"{0}\" because of an insufficient feature level ({1} < {2})",
adapter.Description.Description,
featureLevel.ToString(),
nameof(FeatureLevel.Level_11_0));
continue;
}
try
{
mDevice = new Device(adapter, flags, FeatureLevel.Level_11_0);
DiagnosticsWriter.WriteInformation("Connection to device established: {0}", adapter.Description.Description);
}
catch (Exception ex)
{
error = ex;
continue;
}
break;
}
if (mDevice == null)
{
if (error != null)
{
throw new Exception(string.Format(error.Message, error));
}
throw new NotSupportedException("No suitable adapter could be found.");
}
}
protected override void DisposeOverride()
{
DiagnosticsWriter.WriteInformation("Disconnecting from device");
var resources = mResources?.ToArray() ?? new HardwareResource[0];
if (resources.Length > 0)
{
DiagnosticsWriter.WriteWarning("The is being disconnected from but there are still {0} associated resource(s) allocated. The resources will be disposed to avoid memory leaks", resources.Length);
foreach (var resource in resources)
{
resource?.Dispose();
}
}
mResources?.Clear();
mResources = null;
System.Diagnostics.Debug.Assert(!mDevice.Disposed);
mDevice?.Dispose();
mFactory?.Dispose();
mDevice = null;
mFactory = null;
DiagnosticsWriter.WriteInformation("Disconnection completed.");
}
internal void RemoveResource([NotNull] HardwareResource resource)
{
if (resource == null)
{
throw new ArgumentNullException(nameof(resource));
}
mResources?.Remove(resource);
DiagnosticsWriter.WriteDebug("Removed association of resource \"{0}\" from device.", resource);
}
internal void AddResource([NotNull] HardwareResource resource)
{
if (resource == null)
{
throw new ArgumentNullException(nameof(resource));
}
if (mResources == null)
{
throw new ObjectDisposedException(nameof(AccelerationDevice), "The device is not available anymore.");
}
DiagnosticsWriter.WriteDebug("Associating resource \"{0}\" with device.", resource);
mResources.Add(resource);
}