Implemention of a "run once" function, so that I can invoke a given method like crazy, and the method is only invoked once

Singleton-run-once

var Singleton = {
    _threads : [],
    process: function (name, callback) {
        var evt = this._threads[name];
        if (evt == null) {
            evt = this._threads[name] = { name : name };
        }
        if (evt.running) {
            evt.que = true;
            return;
        }                    
        function complete() {
            evt.running = false;
            if (evt.que) {
                evt.que = false;
                evt.running = true;
                return callback(complete);
            }
        }
        evt.running = true;
        return callback(complete);
    }
}

var count = 0;
function test1() {                
    Singleton.process('name', function (callback) {
        var timer = setTimeout(function () { dosomeshit(); callback(); }, 2000);
    })
}