互斥量得使用方法，线程同步，兄弟线程的同步实现方法，课程设计内容-Have to use mutex, thread synchronization, thread synchronization methods brothers, instructional design

用软件方法解决上述临界区问题—兄弟。即要求修改sm6，实现accnt1+accnt2 提交的程序名：ex2 采用的算法可选择： –Peterson算法：-Solving these critical problems by using software method . That requires modifications to the sm6 implementation of accnt1+accnt2, the program name- submi