public MarkerParallelPortWriter(LogicalParallelPort lpt, bool invertBits, bool reverseBits)
{
Port = lpt;
InvertBits = invertBits;
ReverseBits = reverseBits;
_fileHandle = new AtomicPtr(Kernel32.CreateFile($"lpt{(byte)lpt}", FileAccess.ReadWrite, FileShare.None, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero));
_oneByteBuffer = Marshal.AllocHGlobal(1);
}
public void API_IncrementDecrement()
{
const int InitialPtr = 0x12345000;
var target = new AtomicPtr <DummySixteenByteVal>(new IntPtr(InitialPtr));
var incRes = target.Increment();
FastAssertEqual((DummySixteenByteVal *)(InitialPtr + sizeof(DummySixteenByteVal)), incRes.CurrentValue);
FastAssertEqual((DummySixteenByteVal *)InitialPtr, incRes.PreviousValue);
FastAssertEqual <IntPtr>((IntPtr)(InitialPtr + sizeof(DummySixteenByteVal)), incRes.AsUntyped.CurrentValue);
FastAssertEqual <IntPtr>((IntPtr)InitialPtr, incRes.AsUntyped.PreviousValue);
var decRes = target.Decrement();
FastAssertEqual((DummySixteenByteVal *)(InitialPtr + sizeof(DummySixteenByteVal)), decRes.PreviousValue);
FastAssertEqual((DummySixteenByteVal *)InitialPtr, decRes.CurrentValue);
FastAssertEqual <IntPtr>((IntPtr)(InitialPtr + sizeof(DummySixteenByteVal)), decRes.AsUntyped.PreviousValue);
FastAssertEqual <IntPtr>((IntPtr)InitialPtr, decRes.AsUntyped.CurrentValue);
}
public void API_AddSubtract()
{
const int InitialPtr = 0x12345000;
var target = new AtomicPtr <DummySixteenByteVal>(new IntPtr(InitialPtr));
AssertResult(target.Add(10), InitialPtr, InitialPtr + sizeof(DummySixteenByteVal) * 10);
AssertResult(target.Subtract(10), InitialPtr + sizeof(DummySixteenByteVal) * 10, InitialPtr);
AssertResult(target.Add(10L), InitialPtr, InitialPtr + sizeof(DummySixteenByteVal) * 10);
AssertResult(target.Subtract(10L), InitialPtr + sizeof(DummySixteenByteVal) * 10, InitialPtr);
AssertResult(target.Add(new IntPtr(10L)), InitialPtr, InitialPtr + sizeof(DummySixteenByteVal) * 10);
AssertResult(target.Subtract(new IntPtr(10L)), InitialPtr + sizeof(DummySixteenByteVal) * 10, InitialPtr);
void AssertResult(AtomicPtr <DummySixteenByteVal> .TypedPtrExchangeRes result, int expectedPreviousAddr, int expectedNewAddr)
{
FastAssertEqual((DummySixteenByteVal *)expectedPreviousAddr, result.PreviousValue);
FastAssertEqual((DummySixteenByteVal *)expectedNewAddr, result.CurrentValue);
FastAssertEqual <IntPtr>((IntPtr)expectedPreviousAddr, result.AsUntyped.PreviousValue);
FastAssertEqual <IntPtr>((IntPtr)expectedNewAddr, result.AsUntyped.CurrentValue);
}
}