class HardwareData {
   private boolean value = false;

   HardwareData (boolean value) {
      this.value = value;
   }

   boolean get() {
      return value;
   }

   void set (boolean newValue) {
      value = newValue;
   }
 
   // must be atomic
   boolean getAndSet (boolean newValue) {
      boolean oldValue = this.get();
      this.set (newValue);

      return oldValue;
   }

   // must be atomic
   void swap (HardwareData other) {
      boolean temp = this.get();

      this.set (other.get());
      other.set(temp);
   }
}