internal long AcquirePackerLock(long prolongExisting = 0)
{
if (AdditionalCorrectnessChecks.Enabled)
{
AssertValidPointer();
}
var existing = (Timestamp)Unsafe.ReadUnaligned <long>(_statePointer + StreamLogStateRecord.PackerTimestampOffset);
var now = ProcessConfig.CurrentTime;
if (prolongExisting == 0 && (now - existing).TimeSpan < TimeSpan.FromSeconds(StartupConfig.PackerTimeoutSeconds))
{
return(0);
}
var comparand = prolongExisting == 0 ? (long)existing : prolongExisting;
var existing1 = Interlocked.CompareExchange(
ref *(long *)(_statePointer + StreamLogStateRecord.PackerTimestampOffset), (long)now, comparand);
if (existing1 == comparand)
{
return((long)now);
}
return(0);
}
/// <summary>
/// Sets the pixel buffer in an unsafe manor this should not be used unless you know what its doing!!!
/// </summary>
/// <param name="pixels">The pixel buffer</param>
/// <param name="ownedBuffer">if set to <c>true</c> then this instance ownes the buffer and thus should dispose of it afterwards.</param>
private void SetPixelBufferUnsafe(Buffer2D <TPixel> pixels, bool ownedBuffer)
{
this.PixelBuffer = pixels;
this.ownedBuffer = ownedBuffer;
this.Width = pixels.Width;
this.Height = pixels.Height;
this.PixelSize = Unsafe.SizeOf <TPixel>();
this.RowStride = this.Width * this.PixelSize;
}
internal static ref T NullRef <T>() => ref SupposedlyUnsafe.AsRef <T>(null);
public static bool IsNullRef <T>(ref T source) => SupposedlyUnsafe.AsPointer(ref source) is null;