For a parent and child relationship, we often have the following scenario. After the
fork,both the parent and the child have something to do. For example, the parent
could update a record in a log file with the child’s process ID, and the child might have
to create a file for the parent. In this example, we requirethat each process tell the othe
when it has finished its initial set of operations, and that each wait for the other to
complete, before heading off on its own. The following code illustrates this scenario:

 

여기서 before heading off on its own이 무슨 뜻이냐