Method once

include/process/once.hpp:36–52

Returns true if this Once instance has already transitioned to a 'done' state (i.e., the action you wanted to perform "once" has been completed). Note that this BLOCKS until Once::done has been called.

  // been completed). Note that this BLOCKS until Once::done has been
  // called.
  bool once()
  {
    bool result = false;

    synchronized (mutex) {
      if (started) {
        while (!finished) {
          synchronized_wait(&cond, &mutex);
        }
        result = true;
      } else {
        started = true;
      }
    }

    return result;
  }

  // Transitions this Once instance to a 'done' state.
  void done()