共享内存及信号量PV操作封装 功能：信号量p操作，信号量V操作 共享内存初始化，取出数据， 放入数据，统计共享内存队列长度 -PV Operation package features: shared memory and semaphores semaphore p operation, the semaphore V operation shared memory initialization, remove the data into the data, the sta