javascript - Is there a way to emit end event to all listeners at the same time with Node.js EventEmitter? -

as the docs says, emitter.emit(event[, arg1][, arg2][, ...])

synchronously calls each of listeners registered event, in order registered, passing supplied arguments each.

but simple example:

router.get('/messages', function(req, res, next) {     var addmessagelistener = function(res){         messagebus.once('message', function(data){             res.json(data);         })     }     addmessagelistener(res); });  router.get('/push', function(req, res, next) {     messagebus.emit('message', { awesome : 'event'})     res.status(200).end() }); 

when message event emitted , 2 request listening, 1 of them listen event , execute callback.

is there way emit event listeners @ same time?

edit:

i didnt need listeners execute @ exact same time, need execute of them

edit 2:

after more testing, when create more 1 listener, listening emitter (debugged messagebus.listenercount('message')) 20 seconds delay.

and when 1 listening , second 1 during delay, if call /push emit listening 1 , other 1 start listening.

since used once() function add listener, node call specified listener @ once, , after first call remove listener. if expecting listener called every time message event emitted, need use on() function instead of once().