int main(void) {
srand ( time(NULL) );
//create a new PCB with priority between 0 - 15 and test getters
printf ("Create PCB:\n");
PCB_p PCBTest1 = create("PCB1", 1, rand()%15);
printf ("Name: %s and Process ID: %d and Priority: %d\n", getName(PCBTest1), getPid(PCBTest1), getPriority(PCBTest1));
// test toString() method
printf("Test toString()\n");
toString(PCBTest1); printf("\n");
//free PCB
printf ("Free PCB:\n");
freePCB(PCBTest1);
toString(PCBTest1); printf("\n");
//test create PCB with wrong type for NAME --- EXECUTION FAILS
// PCB_p PCBTest2 = create(5, 1, 4);
// toString(PCBTest2); printf("\n");
//test create PCB with wrong type PID --- Creates PCB and RETURNS RANDOM VALUE
PCB_p PCBTest3 = create("PCB3", "1", rand()%15);
toString(PCBTest3); printf("\n");
//test create PCB with non-int priority
PCB_p PCBTest4 = create("PCB4", 1, "c");
toString(PCBTest4); printf("\n");
//test create PCB with priority value > 15
PCB_p PCBTest5 = create("PCB5", 1, 16);
toString(PCBTest5); printf("\n");
//test create PCB with priority value < 0
PCB_p PCBTest6 = create("PCB6", 1, -1);
toString(PCBTest6); printf("\n");
return 0;
}
//Deletes the PCB from the MPX system
void deletePCB(char PCBName[20]){
PCB *pcbPointer;
pcbPointer = findPCB(PCBName);
removePCB(pcbPointer);
freePCB(pcbPointer);
}
void interrupt sys_call(void){
static IOD *temp;
//Saves the ss and sp register to a temp storage
ss_save2 = _SS;
sp_save2 = _SP;
COP->stack = (unsigned char *)MK_FP(ss_save2,sp_save2);
//Updates the stacktop for context switch
//Access Parameters that sys_req placed on the stack
param_ptr = (params*)(COP->stack+sizeof(context));
//Switching to a temp stack
new_ss = FP_SEG(sys_stack);
new_sp = FP_OFF(sys_stack)+ SYS_STACK_SIZE;
_SS = new_ss;
_SP = new_sp;
trm_getc();
if(TerminalQueue->event_flag==1 && TerminalQueue->count > 0){
TerminalQueue->event_flag = 0;
temp = TerminalQueue->head;
TerminalQueue->head = TerminalQueue->head->next;
unblockPCB(temp->ppt->processName);
sys_free_mem(temp);
TerminalQueue->count--;
if(TerminalQueue->count!=0){
ProcessIORequest(1);
}
}
if(Com_PortQueue->event_flag==1 && Com_PortQueue->count > 0){
Com_PortQueue->event_flag = 0;
temp = Com_PortQueue->head;
Com_PortQueue->head = Com_PortQueue->head->next;
unblockPCB(temp->ppt->processName);
sys_free_mem(temp);
Com_PortQueue->count--;
if(Com_PortQueue->count!=0){
ProcessIORequest(1);
}
}
//Process is idle
if (param_ptr -> op_code == IDLE){
//Sets state to running and adds it back into the readyQueue
COP -> state = 2;
PriorityEnqueue(readyQueue,COP);
}
//Process is completed and ready for deletion
if (param_ptr -> op_code == EXIT){
//Frees the memory of the PCB and sets the PCB to NULL
freePCB(COP);
COP = NULL;
}
if (param_ptr -> op_code == READ ||param_ptr -> op_code == WRITE ||param_ptr -> op_code == CLEAR ||param_ptr -> op_code == GOTOXY ){
IOScheduler();
}
//Dispatches the next process in the readyQueue
dispatch();
}
