/*
Destroys Process with Process ID by clearing the struct
Calls free_PCB to do this
@return 1 if freed properly
@return 0 if failed
*/
uint32_t process_destroy(int PID)
{
uint32_t* addressToClear = get_address_of_PCB(PID);
pcb* pcb_p = get_PCB(PID);
uint32_t free_success = free_PCB(pcb_p);
*addressToClear = 0; //clears the pointer to the PCB
if (free_success)
{
return 1;
}
else
{
return 0;
}
}
/*
* Decrement the remaining CPU time from a process. If the process has no
* remaining CPU time, then the process will be terminated.
*
* The parameters for this function are pointers to pointers of a struct so that
* the underlying pointer can be changed by this function.
*
* PARAMETERS
* pcb: Pointer to the PCB to alter.
*
* RETURN VALUE
* A pointer to the same process, unless this process was terminated in which
* case NULL is returned.
*/
PCB * decrement_remaining_cpu_time(PCB ** pcb) {
if (*pcb != NULL) {
// Decrement the remaining CPU time for the process and check whether the process has any remaining CPU time
if ((--((*pcb)->remaining_cpu_time)) <= 0) {
// Time's up - terminate process
*pcb = terminate_PCB(pcb);
// Free memory associated with the PCB
free_PCB(pcb);
// The PCB has been freed, return NULL
return NULL;
}
}
// Return the PCB
return *pcb;
}
// removes process from memory
void terminateProcess(int argc, char *argv[]){
if (argc == 2){ // checks for args then searches for process
char name[STRLEN];
PCB *pointer;
strcpy(name,argv[1]);
pointer = find_PCB(name);
if ( pointer != NULL){
remove_PCB(pointer);
free_PCB(pointer);
}
}
else{
printf("Wrong arguments entered.");
return;
}
}
