nodejs阻塞执行

AppUtil.js:

let Fiber = require("fibers"); //阻塞执行,sleep
module.exports = {
  /**
   * 挂起.阻塞当前执行.不影响nodejs其它调用.
   * 
   * @param ms {int} 阻塞时长(ms)
   */
    _sleep: function (ms) {
    var fiber = Fiber.current;
    setTimeout(function () {
      fiber.run();
    }, ms);
    Fiber.yield();
  },
  /**
   * 阻塞当前执行,并在唤醒后执行回调
   * @param ms {int} 阻塞时长(ms)
   * @param cb {function()} 回调
   * 使用示例：
   * async.waterfall([
       function (callback) {
            console.log('function1... ' + new Date);
            AppUtil.sleep(5000,()=>{
              return callback(null);
            });
          }, function (callback) {
            console.log('function2... ' + new Date);
            ModelUtil.find(SupplierProductInfo, {_id: '529126446302'}, ['id', 'companyName'], (err, result)=> {
              return callback(err, result);
            });
          },
       ], function (err, result) {
        return AppUtil.handleResult(res, err, result);
     });
   */
  sleep: function (ms, cb) {
    Fiber(function () {
      AppUtil.infoLog(`sleep ${ms}ms.`);
      //console.log('wait... ' + new Date);
      AppUtil._sleep(ms);
      //console.log('ok... ' + new Date);
      return cb();
    }).run();
  },
}

使用示例：
AppUtil.sleep(5*1000,()=>{
  console.log('5秒后执行');
});