4 files changed, 89 insertions, 0 deletions
diff --git a/Year_3/TSDWL/ex_20131219/MainThread.java b/Year_3/TSDWL/ex_20131219/MainThread.java
new file mode 100644
index 0000000..ea62871
--- /dev/null
+++ b/Year_3/TSDWL/ex_20131219/MainThread.java
@@ -0,0 +1,17 @@
+public class MainThread {
+    public static void main(String[] args) {
+        Shared mem = new Shared();
+        Thread1 t1 = new Thread1(mem);
+        Thread2 t2 = new Thread2(mem);
+
+        t1.start();
+        t2.start();
+
+        try {
+            t1.join();
+            t2.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/Year_3/TSDWL/ex_20131219/Shared.java b/Year_3/TSDWL/ex_20131219/Shared.java
new file mode 100644
index 0000000..18976c5
--- /dev/null
+++ b/Year_3/TSDWL/ex_20131219/Shared.java
@@ -0,0 +1,10 @@
+public class Shared {
+    private int m;
+
+    public Shared() {
+        m = (int) (Math.random() * (11-1+1)+1);
+    }
+
+    synchronized public void set(int val) { m = val; }
+    synchronized public int get() { return m; }
+}
diff --git a/Year_3/TSDWL/ex_20131219/Thread1.java b/Year_3/TSDWL/ex_20131219/Thread1.java
new file mode 100644
index 0000000..b9f8d84
--- /dev/null
+++ b/Year_3/TSDWL/ex_20131219/Thread1.java
@@ -0,0 +1,31 @@
+public class Thread1 extends Thread {
+    private Shared mem;
+
+    public Thread1(Shared mem) {
+        super();
+        this.mem = mem;
+    }
+
+    public void run() {
+        int xrand;
+        int m;
+        while (true) {
+            synchronized(mem) {
+                m = mem.get();
+                if (m >= 1 && m <= 5) {
+                    xrand = (int) (Math.random() * (10-1+1)+1);
+                    System.out.printf("Thread 1: (%d, %d)\n", m, xrand);
+                    mem.set(xrand);
+                    mem.notifyAll();
+                } else {
+                    try {
+                        mem.wait();
+                    } catch(InterruptedException e) {
+                        e.printStackTrace();
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/Year_3/TSDWL/ex_20131219/Thread2.java b/Year_3/TSDWL/ex_20131219/Thread2.java
new file mode 100644
index 0000000..152e9e0
--- /dev/null
+++ b/Year_3/TSDWL/ex_20131219/Thread2.java
@@ -0,0 +1,31 @@
+public class Thread2 extends Thread {
+    private Shared mem;
+
+    public Thread2(Shared mem) {
+        super();
+        this.mem = mem;
+    }
+
+    public void run() {
+        int xrand;
+        int m;
+        while (true) {
+            synchronized(mem) {
+                m = mem.get();
+                if (m >= 6 && m <= 10) {
+                    xrand = (int) (Math.random() * (10-1+1)+1);
+                    System.out.printf("\t\t\tThread 2: (%d, %d)\n", m, xrand);
+                    mem.set(xrand);
+                    mem.notifyAll();
+                } else {
+                    try {
+                        mem.wait();
+                    } catch(InterruptedException e) {
+                        e.printStackTrace();
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}