时间片例程 结果和pdf给出的结果不同

thread 1 is running ,thread 1 count = 0
thread 1 is running ,thread 1 count = 5
thread 1 is runnimsh >ng ,thread 1 count = 10
thread 1 is running ,thread 1 count = 15
thread 1 is running ,thread 1 thread 2 is running ,thread 2 count = 0
thread 2 icount = 5
 thread 1 is running ,thread 1 count = 25
thread 1 is running ,thread 1 count = 30
thread s running ,thread 1 count = 35thread 2 is running ,t2 is running ,thread 2 count = 10
thread 1 is running ,thread 1 count = 40
thread 1 is running ,threahread 1 count = 45
thread 2 is running ,thread 2 cod 2 count = 15
thread 1 is running ,thread 1 count = 50
thread 1 is running ,thread 1 count = 55