Examine Running Processes and Stop the Supervisors

The which_children function

We can get more information about running child processes by using which_children/1. This function returns a list of tuples. Each tuple has four elements:

• It contains the child process’s ID, which could be :undefined for dynamically started processes.

• It contains the child process’s PID or the :restarting value when the process is in the middle of a restart.

• It contains the process’s type, either :worker or :supervisor.

• It also contains the module implementation, which is returned in a list.

Just like count_children/1, which_children/1 is also implemented in the DynamicSupervisor and Supervisor modules.

Examine how our job process is started