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
// loads a program into memory
void loadProgram(int argc, char *argv[]){ //name,fileName,priority,path
// sets up variables
static int count;
MEMDSC *tempMem;
unsigned char temptop;
char *dir, *name, *filename;
int size,offset,priority;
tcontext *tempContext;
unsigned int *tempCS,*tempIP;
STACKDSC *temp;
// initializes values
int err = 0;
PCB *newPCB = allocate_PCB();
tempMem=newPCB->memdsc;
dir = (char*) sys_alloc_mem(30 * sizeof(char));
name = (char*) sys_alloc_mem(30 * sizeof(char));
filename = (char*) sys_alloc_mem(30 * sizeof(char));
strcpy(dir,argv[4]);
strcpy(name,argv[1]);
strcpy(filename,argv[2]);
priority = atoi(argv[3]);
err = sys_check_program(dir,filename,&size,&offset);
if((argc==5)||(127<=priority<=-128)&&( err==0)){ //checks for validity
/* if( count == ZERO ){ //If first process allocate queue
rQueue = (ROOT*) sys_alloc_mem(sizeof(ROOT));
wsQueue = (ROOT*) sys_alloc_mem(sizeof(ROOT));
} */
setup_PCB(newPCB,name,APPLICATION,SUSPENDED_READY,priority);
// sets up the adressess
newPCB->memdsc->loadADDR= sys_alloc_mem(size);
newPCB->memdsc->execADDR=newPCB->memdsc->loadADDR + offset;// is this the correct address?
//make sure all registers are properly set
newPCB -> stackdsc-> top = newPCB -> stackdsc-> base + STACKSIZE - sizeof(tcontext);
tempContext = (tcontext *) (newPCB -> stackdsc-> top);
tempContext ->ES = _ES;
tempContext ->DS = _DS;
tempContext ->CS = FP_SEG(newPCB->memdsc->execADDR);
tempContext ->IP = FP_OFF(newPCB->memdsc->execADDR);
tempContext ->FLAGS = 0x200;
// load the program into memory
err = sys_load_program(newPCB->memdsc->loadADDR,size,dir,filename);
insert_PCB(newPCB); // put pcb into a queue
count++;//Update the number of times the function has run.
}
else{
printf("Wrong or invalid arguments entered.");
}
}
