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OS.java
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import java.io.*;
import java.util.*;
import java.lang.*;
public class OS {
private static char[][] M = new char[300][4];
private char[] buffer = new char[40];
private static Integer[] flag = new Integer[30];
private static String line;
// registers
private static char[] IR = new char[4];
private static char[] R = new char[4];
private static int C = 0;
private static int IC = 0;
private static int PTR = 0;
private static int VA = 0;
private static int RA = 0;
private static int sRA = 0;
private static int kio = -1;
// interupts
private static int SI = 0;
private static int PI = 0;
private static int TI = 0;
private static int iSBT = 0;
// interupt counters
private static int TTC = 0;
private static int LLC = 0;
private static boolean endProgram = false;
private String inputFile;
private String outputFile;
private FileReader input;
private BufferedReader fread;
private FileWriter output;
private BufferedWriter fwrite;
PCB pcb = new PCB();
Random rd = new Random();
public OS(String ifile, String ofile) {
this.inputFile = ifile;
this.outputFile = ofile;
try {
this.input = new FileReader(inputFile);
this.fread = new BufferedReader(input);
this.output = new FileWriter(outputFile);
this.fwrite = new BufferedWriter(output);
} catch (IOException e) {
e.printStackTrace();
}
}
private void dispMemo() {
for (int i = 0; i < 300; i++) {
System.out.println("memory[" + i + "] " + new String(M[i]));
}
System.out.print("\n");
}
public void allocate() {
int pos, check = 0, len, level = 0;
char[] str = new char[2];
while (check != 1) {
kio++; // 1
pos = Math.abs((rd.nextInt() % 29) * 10); // 170
while (flag[pos / 10] != 0) {
pos = Math.abs((rd.nextInt() % 29) * 10);
}
flag[pos / 10] = 1; // 17 = 1
str = Integer.toString(pos).toCharArray(); // 170
System.out.println(pos);
if (pos / 100 == 0) {
M[PTR + kio][2] = '0'; // 28 -> **0*
M[PTR + kio][3] = str[0]; // 20 -> **09
} else {
M[PTR + kio][2] = str[0]; //
M[PTR + kio][3] = str[1];
}
try {
line = fread.readLine(); // H
buffer = line.toCharArray(); // H
level++; // 3
int k = 0;
for (int i = 0; i < (line.length() / 4) + 1; i++) { // 1 times
for (int j = 0; j < 4; j++) { // 4 times
if (buffer[k] != 'H') {
System.out.println(buffer[k]);
M[pos + i][j] = buffer[k]; // 20[0] -> H
} else {
check = 1;
M[pos + (i)][0] = 'H'; // 125 -> H
M[pos + (i)][1] = '0'; // 125 -> H0
M[pos + (i)][2] = '0'; // 125 -> H00
M[pos + (i)][3] = '0'; // 125 -> H000
break;
}
k++; // 40
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public void MOS() {
try {
if (PI == 1) {
System.out.println("4: Opcode Error. Program terminated abnormally.");
fwrite.write("4: Opcode Error. Program terminated abnormally.\n");
endProgram();
return;
} else if (PI == 2) {
System.out.println("5: Oprand Error. Program terminated abnormally.");
fwrite.write("5: Oprand Error. Program terminated abnormally.\n");
endProgram();
return;
} else if (PI == 3) {
System.out.println("6: Invalid Page fault. Program terminated abnormally.");
fwrite.write("6: Invalid Page fault. Program terminated abnormally.\n");
endProgram();
return;
}
if (TI == 2) {
System.out.println("3: Time limit exceeded. Program terminated abnormally.");
fwrite.write("3: Time limit exceeded. Program terminated abnormally.\n");
endProgram();
return;
}
if (SI == 3) {
endProgram();
} else if (SI == 1) {
if (TI == 0) {
read();
} else if (TI == 2) {
System.out.println("3: Time limit exceeded. Program terminated abnormally.");
fwrite.write("3: Time limit exceeded. Program terminated abnormally.\n");
endProgram();
return;
} else if (TI == 1) {
System.out.println("2: Line limit exceeded. Program terminated abnormally.");
fwrite.write("2: Line limit exceeded. Program terminated abnormally.\n");
endProgram();
return;
}
} else if (SI == 2) {
if (TI == 0) {
System.out.println("Going to call write");
write();
} else if (TI == 2) {
write();
System.out.println("3: Time limit exceeded. Program terminated abnormally.");
fwrite.write("3: Time limit exceeded. Program terminated abnormally.\n");
endProgram();
return;
} else if (TI == 1) {
System.out.println("2: Line limit exceeded. Program terminated abnormally.");
fwrite.write("2: Line limit exceeded. Program terminated abnormally.\n");
endProgram();
return;
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void endProgram() {
dispMemo();
endProgram = true;
try {
fwrite.write("SI: " + SI + " PI: " + PI + " TI: " + TI + " TTC: " + TTC + " LLC: " + LLC);
System.out.println("SI: " + SI + " PI: " + PI + " TI: " + TI + " TTC: " + TTC + " LLC: " + LLC);
fwrite.newLine();
fwrite.newLine();
// fwrite.close();
} catch (Exception e) {
e.printStackTrace();
}
// System.exit(0);
}
public void read() {
int no;
try {
line = fread.readLine(); // *
buffer = line.toCharArray();
if (line.contains("$END")) {
System.out.println("1: Out Of Data. Program terminated abnormally.");
fwrite.write("1: Out Of Data. Program terminated abnormally.\n");
endProgram();
return;
}
no = sRA;
int k = 0;
for (int i = 0; k < line.length(); i++) { // i = 1
for (int j = 0; j < 4 && k < line.length(); j++) { // j = 1
M[no + i][j] = buffer[k]; // 210 -> *
k++; // 1
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void write() {
System.out.println("Inside Write");
int no;
try {
// no = Integer.parseInt(String.valueOf(M[RA][2]) + String.valueOf(M[RA][3]));
// no = no * 10; // 120
no = sRA;
int k = 0;
while (true) {
for (int i = 0; i < 4; i++) {
if (M[no][i] == '\0') {
break;
}
System.out.print(M[no][i]);
fwrite.write(M[no][i]);
k++;
}
if (M[no][0] == '\0') {
break;
}
no++;
}
System.out.print("\n");
// fwrite.newLine();
} catch (Exception e) {
e.printStackTrace();
}
}
public void addMap() {
int add, pos;
char[] str = new char[2];
RA = PTR + (VA / 10);
if (M[RA][3] == '*') {
System.out.println("Page fault occur");
if (IR[0] == 'P' || IR[0] == 'L' || IR[0] == 'C') {
PI = 3;
MOS();
return;
}
pos = Math.abs((rd.nextInt() % 29) * 10); // 160
while (flag[pos / 10] != 0) {
pos = Math.abs((rd.nextInt() % 29) * 10);
}
flag[pos / 10] = 1; // 16 = 1
str = Integer.toString(pos).toCharArray(); // 160
if (pos / 100 == 0) {
M[RA][2] = '0';
M[RA][3] = str[0];
} else {
M[RA][2] = str[0]; // 12 -> **1*
M[RA][3] = str[1]; // 12 -> **16
}
}
if (RA > PTR + 10) {
PI = 2;
MOS();
}
int PTE = PTR + (VA / 10); // 263
int mpte = Integer.parseInt(String.valueOf(M[PTE][2]) + String.valueOf(M[PTE][3])); // 16
sRA = mpte * 10 + (VA % 10);
}
public void examine() {
char ch = IR[0]; // S
switch (ch) {
case 'G':
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
if (IR[1] != 'D') {
PI = 1;
MOS();
} else {
TTC++;
if (TTC <= pcb.ttl) { // ttc = 2
SI = 1;
MOS();
} else {
TI = 2;
MOS();
}
}
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
SI = PI = TI = 0;
break;
case 'P':
SI = 2;
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
if (IR[1] != 'D') {
PI = 1;
MOS();
} else {
System.out.println(pcb.tll);
System.out.println(LLC);
LLC++;// 1
System.out.println(LLC);
TTC++; // 3
if (LLC > pcb.tll) {
System.out.println("Inside LLC < tll");
TI = 1;
MOS();
}
if (TTC > pcb.ttl) {
System.out.println("Inside TTC < ttl");
TI = 2;
MOS();
} else {
SI = 2;
System.out.println("Going to call MOS");
MOS();
try {
fwrite.newLine();
} catch (Exception e) {
e.printStackTrace();
}
}
}
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
SI = PI = TI = 0;
break;
case 'L':
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
if (IR[1] != 'R') {
PI = 1;
MOS();
} else {
TTC++;
if (TTC <= pcb.ttl) {
for (int i = 0; i < 4; i++) {
// get 2 and 3rd index of RA
// int no = Integer.parseInt(String.valueOf(M[RA][2]) +
// String.valueOf(M[RA][3]));
// no = no * 10;
R[i] = M[sRA][i];
}
} else {
TI = 2;
MOS();
}
}
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
break;
case 'S':
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
if (IR[1] != 'R') {
PI = 1;
MOS();
} else {
TTC++;
if (TTC <= pcb.ttl) {
System.out.println("Inside TTC check");
for (int i = 0; i < 4; i++) {
M[sRA][i] = R[i];
}
} else {
TI = 2;
MOS();
}
}
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
break;
case 'C':
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
if (IR[1] != 'R') {
PI = 1;
MOS();
} else {
// System.out.println("bauidaudbakdbuakdbakdbakdbkdkb");
System.out.println(String.valueOf(M[sRA][0]) + String.valueOf(M[sRA][1]) + String.valueOf(M[sRA][2])
+ String.valueOf(M[sRA][3]) + " "
+ String.valueOf(R[0]) + String.valueOf(R[1]) + String.valueOf(R[2])
+ String.valueOf(R[3]));
TTC++;
if (TTC <= pcb.ttl) {
int res = 1;
for (int i = 0; i < 4; i++)
if (M[sRA][i] != R[i])
res = 0;
C = res;
// res = 0;
} else {
TI = 2;
MOS();
}
}
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
break;
case 'B':
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
if (IR[1] != 'T') {
PI = 1;
MOS();
} else {
TTC++;
if (TTC <= pcb.ttl) {
iSBT = 1;
if (C == 1)
IC = Integer.parseInt(String.valueOf(IR[2]) + String.valueOf(IR[3]));
// System.out.println("Inside BTTTTTTTT.....");
System.out.println(IC);
C = 0;
} else {
TI = 2;
MOS();
}
}
System.out.println("SI:" + SI + " TI:" + TI + " PI:" + PI + "TTC: " + TTC + " LLC: " + LLC);
break;
case 'H':
SI = 3;
MOS();
break;
default:
PI = 1;
MOS();
break;
}
}
public void executeProgram() {
int no;
char[] a = new char[3];
for (int i = 0; i <= kio; i++) { // kio = 2
a[0] = M[PTR + i][2]; //
a[1] = M[PTR + i][3]; // 04
a[2] = '\0';
no = Integer.parseInt(String.valueOf(a).trim()); // 4
for (IC = 0; IC < 10;) {
// System.out.print("aifnaofnaofnaofnaof");
// System.out.println(IC);
for (int k = 0; k < 4; k++) {
IR[k] = M[no * 10 + IC][k];
} // IR = GD30
IC++;
if (Character.isDigit(IR[2]) && Character.isDigit(IR[3])) {
if (IR[0] != '\0') {
System.out.println("IR: " + String.valueOf(IR).trim());
VA = Integer.parseInt(String.valueOf(IR).substring(2, 4)); // 20
System.out.println("VA: " + VA);
addMap();
if (endProgram) {
break;
}
examine();
if (endProgram) {
break;
}
}
if (endProgram) {
break;
}
} else {
PI = 2;
MOS();
if (endProgram) {
break;
}
}
}
if (endProgram) {
break;
}
}
}
public void startExecution() {
IC = 0;
executeProgram();
}
public void initialize() {
endProgram = false;
int i, j;
// page address
PTR = Math.abs((rd.nextInt() % 29) * 10); // 50
for (i = 0; i < 30; i++) {
flag[i] = 0;
}
System.out.println("PTR: " + PTR); // 50
// mark PTR block as occupied
flag[PTR / 10] = 1; // flag[5] = 1
// set all memory as default
for (i = 0; i < 300; i++) {
for (j = 0; j < 4; j++) {
M[i][j] = '\0';
}
}
// Page table register
for (i = PTR; i < PTR + 10; i++) {
for (j = 0; j < 4; j++) {
M[i][j] = '*';
}
}
for (i = 0; i < 4; i++) {
IR[i] = '\0';
R[i] = '\0';
}
C = IC = VA = RA = SI = PI = TI = TTC = LLC = sRA = 0;
kio = -1;
}
public void load() {
try {
while ((line = fread.readLine()) != null) {
System.out.println(line);
if (line.contains("$AMJ")) {
System.out.println("Found $AMJ");
pcb.jobid = line.substring(4, 8); // 0202
pcb.ttl = Integer.parseInt(line.substring(8, 12)); // 0017
pcb.tll = Integer.parseInt(line.substring(12, 16)); // 0005
System.out.println(pcb.ttl);
System.out.println(pcb.tll);
initialize();
allocate();
} else if (line.contains("$DTA")) {
startExecution();
}
}
fwrite.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}