void resume(){
char *tempPtr = NULL; //Temporary Input Character Pointer
PCBitem *tempPCB; //Temporary PCB Item
int charCount = 0;
// Get PCB name from the user
printf("Please enter the name of the PCB to resume: ");
tempPtr = keyboardInput(0); //Gets process name from User
tempPtr = pointer2Str(tempPtr); //Convert Character Pointer to Character String
charCount = sizeOfPointer(tempPtr); //Get Name Size
if((charCount >= 8)){ //Check that Name is Valid (Check to see if at least 8 chars. + Null Terminator)
tempPCB = find_PCB(tempPtr);
if(tempPCB != NULL){ //Check if Name Exists
if(tempPCB->state == RUNNING){
printf("Error: There is no need to resume an already running process.\n");
} else if(tempPCB->state == READY){
printf("Error: This process is READY but not suspended.\n");
} else if(tempPCB->state == BLOCKED){
printf("Error: This process is Blocked but not suspended.\n");
} else{
// Should remove the process from the SUSREADY or SUSBLOCKED queue (by calling remove_PCB)
error = remove_PCB(tempPCB->state, tempPCB);
error = errorCheck(error);
// Puts the PCB in the unsuspended state
if(tempPCB->state == SUSREADY){
tempPCB->state = READY;
} else if(tempPCB->state == SUSBLOCKED){
tempPCB->state = BLOCKED;
}//end if
// Might require changing queues (from ready to suspended ready, for example) if 4 queues are used
error = insert_PCB(tempPCB->state, tempPCB);
error = errorCheck(error);
// Display appropriate error or success message
if(error == 0){
printf("The PCB Process has been successfully resumed.\n");
}//end if
}//end if
}else{
printf("Process Name does not exist.\n");
}//end if
}else{
printf("Process Name is Invalid. Process Name must be at least 8 characters in length.\n");
}//end if
}//end resume
void setPriority(){
char *tempPtr = NULL; //Temporary Input Character Pointer for PCB Name
char *tempPtr2 = NULL; //Temporary Input Character Pointer for New Priority
PCBitem *tempPCB; //Temporary PCB Item
int charCount = 0; //Number of Characters in Process Name
int newPriority = 0; //New Priority value
//Get PCB name
printf("Please enter the name of the PCB to Set the Priority: ");
tempPtr = keyboardInput(0); //Gets process name from User
tempPtr = pointer2Str(tempPtr); //Convert Character Pointer to Character String
charCount = sizeOfPointer(tempPtr); //Get Name Size
if((charCount >= 8)){ //Check that the Name is Valid (Check to see if at least 8 chars. + Null Terminator)
tempPCB = find_PCB(tempPtr);
if(tempPCB != NULL){ //Check that the PCB Exists
//Get New Priority from User
printf("Please enter a number between -128 & +127 to set the new Priority: ");
tempPtr = keyboardInput(0); //Gets process name from User
newPriority = pointer2Int(tempPtr); //Convert Character Pointer to Int
if((new_pPriority >= -128) || (new_pPriority <= 127)){ //Check that the new priority is valid (-128 to 127)
tempPCB->pPriority = new_pPriority; //Set new PCB Priority
//If the PCB is in the ready state, you will need to change the position of the PCB in the queue based upon its new priority
if(tempPCB->state == READY){
error = remove_PCB(tempPCB->state, tempPCB); //Remove PCB from Ready Queue
error = errorCheck(error); //Perform Error Check
error = insert_PCB(tempPCB->state, tempPCB); //Insert PCB into Ready Queue (so as to adjust for new Priority)
error = errorCheck(error); //Perform Error Check
}//end if
}//end if
//Display appropriate error or success message.
if(error == 0){
printf("The PCB Process has been successfully blocked.\n");
}//end if
} else{
printf("Process Name does not exist.\n");
}//end if
} else{
printf("Process Name is Invalid. Process Name must be at least 8 characters in length.\n");
}//end if
}//end setPriority
// 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;
}
}
