This looks like it does the wrong thing. If "ask" gets to access the scheduler's task list as a queue, then entering an invalid name in the first response and

This looks like it does the wrong thing. If "ask" gets to access the scheduler's task list as a queue, then entering an invalid name in the first response and only valid names thereafter will cause the first valid name to be given to the second player, the second valid name to the third player, and so on. If "ask" gets to access the scheduler's task list as a stack, then a sequence of only valid input names will cause the last player to have the first input name, the second-last player to have the second input name, and so on. Edit: I was optimistically assuming that the consumer of the many "asks" that are created all at once would process them sequentially, dealing with one and invoking the callback before dealing with the next. If you do not assume this, my problem disappears and you get the simpler problem of spawning many prompts simultaneously.