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 statistics shared memory queue length