Method lock

include/process/mutex.hpp:33–48

  Mutex() : data(new Data()) {}

  Future<Nothing> lock()
  {
    Future<Nothing> future = Nothing();

    synchronized (data->lock) {
      if (!data->locked) {
        data->locked = true;
      } else {
        Promise<Nothing> waiter;
        future = waiter.future();
        data->waiters.push(std::move(waiter));
      }
    }

    return future;
  }

  void unlock()
  {