code: function Scheduler() {
    this.queueCount = 0;
    this.holdCount = 0;
    this.blocks = new Array(NUMBER_OF_IDS);
    this.list = null;
    this.currentTcb = null;
    this.currentId = null;
  }
docs: A scheduler can be used to schedule a set of tasks based on their relative
  priorities.  Scheduling is done by maintaining a list of task control blocks
  which holds tasks and the data queue they are processing.
  @constructor