pc的windows下得BC4.5环境中，新建事件任务，在没有引入信号量的情况下，会发生一些现象，仔细观察，这些现象，可以深入的理解多任务操作系统-pc, the windows have BC4.5 environment, the new event task, the amount of the incoming signal in the absence of the case, the phenomenon will occur, careful observation of thes