text: 'use strict';
  var WorkerPool = require('./util/worker_pool');
  
  var globalWorkerPool;
  
  /**
   * Creates (if necessary) and returns the single, global WorkerPool instance
   * to be shared across each Map
   * @private
   */
  module.exports = function getGlobalWorkerPool () {
      if (!globalWorkerPool) {
          globalWorkerPool = new WorkerPool();
      }
      return globalWorkerPool;
  };
  