Race condition when posting an envelope into an inbox

[nobeh]

With a minimal example as:

        for (int i = 0; i < n; ++i) {
            Future<Integer> f = actor.send(actor, message);
            try {
                f.get();
            } catch (Exception e) {
                e.printStackTrace(System.err);
            }
        }

it is possible that delivering an envelope into the inbox would run into a race condition and thus the future value might be lost. Note that in such situation using jstack might not should any BLOCKED threads as this is a race condition that is lost in the internal executor of the envelope executors.