"Evidence of Non-Atomicity Using Word-Sized Values"

private static long* misalignedLongPtr = GetMisalignedHeapLong();

private static long* GetMisalignedHeapLong() {
	const int MISALIGNMENT = -3;
	const int X64_CACHE_LINE_SIZE = 64;
	const int WIN_ALLOC_ALIGN = 8;
	IntPtr reservedMemory = Marshal.AllocHGlobal(new IntPtr(sizeof(long) + X64_CACHE_LINE_SIZE + (sizeof(long) - 1) + WIN_ALLOC_ALIGN));
	IntPtr cacheLineStart = (IntPtr) ((((long) reservedMemory + (X64_CACHE_LINE_SIZE - 1)) / X64_CACHE_LINE_SIZE) * X64_CACHE_LINE_SIZE);
	return (long*) (cacheLineStart + MISALIGNMENT);
}

private static void WriterThreadEntry() {
	while (true) {
		*misalignedLongPtr = -1L;
		*misalignedLongPtr = 1L;
	}
}

private static void ReaderThreadEntry() {
	while (true) {
		var value = *misalignedLongPtr;
		if (value != 1L && value != -1L) {
			Console.WriteLine("Torn read! " + value);
		}
	}
}