michael@0: var count = 0;
michael@0: function timerFunction() {
michael@0:   if (++count == 30) {
michael@0:     close();
michael@0:     postMessage("ready");
michael@0:     while (true) { }
michael@0:   }
michael@0: }
michael@0: 
michael@0: for (var i = 0; i < 10; i++) {
michael@0:   setInterval(timerFunction, 500);
michael@0: }