1、 实现事件栅栏原语并进行正确性测试； 2、 实现闹钟原语并进行正确性测试； 3、 利用事件栅栏和闹钟原语来解决电梯问题 -1, the realization event fence primitives and the correctness of the test 2, to achieve alarm primitives and the correctness of the test 3, the use of fences and alarm event primi

北京大学ICS 实验3 改版前的ICS实验3 具体说明见附件-ICS ICS Peking experiment Experiment 2 before the revision of Annex 2 illustrates