使用C ++停止并开始在Linux中再次运行进程

I have two process and a shared memory zone, my workflow is like this. The process A write some data in the shared memory, after that it should wait and send a signal to other process B to start running. The process B should read some data from the shared memory do some stuff write the result, and send a signal to the process A to keep running, after this process B should wait.I have two process and a shared memory zone, my