PCBs have two fields: parent $($index of the process's creator$)$ and children $($a linked list of child processes$).$

Functions create$($p$)$ and destroy$($p$)$ handle process creation and destruction using linked lists.

The necessary functions are simplified as follows:

create$($p$)$ represents the create function executed by process PCB$[$p$].$ The function creates a new child process PCB$[$q$]$ of process PCB$[$p$]$ by performing the following tasks:

allocate a free PCB$[$q$]$

record the parent's index, p$,$ in PCB$[$q$]$

initialize the list of children of PCB$[$q$]$ as empty

create a new link containing the child's index q and appends the link to the linked list of PCB$[$p$]$

destroy$($p$)$ represents the destroy fu