/* Performs an atomic compare exchange operation on the 64-bit unsigned integer specified by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. The compare exchange operation must be performed using MP safe mechanisms. */
UINT64 EFIAPI InternalSyncCompareExchange64(IN volatile UINT64 *Value, IN UINT64 CompareValue, IN UINT64 ExchangeValue)
/* Performs an atomic compare exchange operation on the 64-bit unsigned integer specified by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. The compare exchange operation must be performed using MP safe mechanisms. */
UINT64 EFIAPI InternalSyncCompareExchange64(IN volatile UINT64 *Value, IN UINT64 CompareValue, IN UINT64 ExchangeValue)
{
  return _InterlockedCompareExchange64 (Value, ExchangeValue, CompareValue);
}