

child has it. child process gives it up. parent has it. parent process gives it up. child has it. child process gives it up. parent has it. parent process gives it up. child has it. child process gives it up. parent has it. parent process gives it up. child has it. child process gives it up. parent has it. parent process gives it up. child has it. child process gives it up. parent has it. parent process gives it up. 
parent has it. child has it child process gives it up parent process gives it up [system hangs] 