public static void main(String[] args) {
final String PROCESSES_FILE = "processes.txt";
final int TIME_QUANTUM = 2;
// Read processes in from the file and add them to the ready queue.
Queue<Process> readyQueue = new LinkedList<Process>();
for (int i = 0; i < 20; i++) {
readyQueue.add(new Process(i, i + 20, i + 13, 0.3));
}
int ticker = 0;
CPU cpu = new CPU();
Process process = readyQueue.poll();
while (readyQueue.size() > 0) {
if (process.getState() == ProcessState.TERMINATED) {
readyQueue.remove(process);
process = readyQueue.poll();
} else if (process.getBurstTime() % TIME_QUANTUM == 0) {
// Put the current process in ready state and add it back to
// the queue
process.setState(ProcessState.READY);
readyQueue.add(process);
process = readyQueue.poll();
}
process.setState(ProcessState.RUNNING);
try {
cpu.setPC(process.generateInstruction());
cpu.setRegisters(process.generateRegisters());
process.incrementBurstTime();
System.out.print("CPU at " + ticker + ": " + cpu + " on pid: " + process.getPid() + "\n");
} catch (Exception e) {
System.out.println(e.getMessage());
}
ticker++;
}
}
public void executeProgram(int address) {
cpu.clearStacks();
cpu.setPC(address);
cpu.run();
System.out.println("(end of program execution)");
}
