Javascript Singleton Lock

Lock.js

var aquired = false,
    lock;

function Lock() {

    if (!lock) lock = this;

    return lock;
}

Lock.prototype = {

    getLock: function() {
        if (aquired) return false;
        aquired = true;
        return true;
    },

    releaseLock: function() {
        aquired = false;
    }

};