//**************************** test demo ****************************
        var casValue = new(int64)
	*casValue = 0
	var old int64 = 0
	var new int64 = 1
	var container *list.List
	container = list.New()
	var wg sync.WaitGroup
	wg.Add(10)
	t1 := time.Now()
	for i := 0; i < 10; i++ {
		go func(i int) {
			for j := 0; j < 10000; {
				if atomic.CompareAndSwapInt64(casValue, old, new) {
					var test = "hello world，hello world，hello world"
					container.PushBack(test)
					*casValue = 0
					j++
				}
				println("hello")//、os.Create("test")、os.Open("test") is ok
			}
			println("casValue=", *casValue)
			wg.Done()
		}(i)
	}
	lentcy := time.Since(t1)
	wg.Wait()
	fmt.Println(container.Len())
//******************************************************************