What is the Meteor concurrency model?

s.acceptChannel <-&Connection{tcpConn: rw, .... }

go handleConnection(&Connection{tcpConn: rw, .... })

newConns := make(chan net.Conn)

// For every listener spawn the following routine
go func(l net.Listener) {
    for {
        c, err := l.Accept()
        if err != nil {
            // handle error (and then for example indicate acceptor is down)
            newConns <- nil
            return
        }
        newConns <- c
    }
}(listener)

for {
    select {
    case c := <-newConns:
        // new connection or nil if acceptor is down, in which case we should
        // do something (respawn, stop when everyone is down or just explode)
    case <-time.After(time.Minute):
        // timeout branch, no connection for a minute
    }
}

var currentVal;

while(true) {
  currentVal = Foo.findOne(id).val; // yields

  if( Foo.update({_id: id, val: currentVal}, {$inc: {val: 1}}) > 0 ) {
    // Operation went as expected
    // (your code here, e.g. endRound)
    break;
  }
  else {
    // Race condition detected, try again
  }
}