4 files changed, 89 insertions, 0 deletions
diff --git a/Year_3/TSDWL/ex_20191218/MainThread.java b/Year_3/TSDWL/ex_20191218/MainThread.java
new file mode 100644
index 0000000..c340a2a
--- /dev/null
+++ b/Year_3/TSDWL/ex_20191218/MainThread.java
@@ -0,0 +1,9 @@
+public class MainThread {
+    public static void main(String[] args) {
+        Shared sh = new Shared();
+        Thread1 t1 = new Thread1(sh);
+        Thread2 t2 = new Thread2(sh);
+        t1.start();
+        t2.start();
+    }
+}
diff --git a/Year_3/TSDWL/ex_20191218/Shared.java b/Year_3/TSDWL/ex_20191218/Shared.java
new file mode 100644
index 0000000..105fbf8
--- /dev/null
+++ b/Year_3/TSDWL/ex_20191218/Shared.java
@@ -0,0 +1,10 @@
+public class Shared {
+    private int x;
+
+    public Shared() {
+        x = (int) (Math.random() * (10-0+1)+0);
+    }
+
+    synchronized void set(int val) { x = val; }
+    synchronized int get() { return x; }
+}
diff --git a/Year_3/TSDWL/ex_20191218/Thread1.java b/Year_3/TSDWL/ex_20191218/Thread1.java
new file mode 100644
index 0000000..55edaba
--- /dev/null
+++ b/Year_3/TSDWL/ex_20191218/Thread1.java
@@ -0,0 +1,42 @@
+public class Thread1 extends Thread {
+    Shared mem;
+    public Thread1(Shared mem) {
+        super();
+        this.mem = mem;
+    }
+
+    public void run() {
+        int m;
+
+        while (true) {
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+                break;
+            }
+            m = (int) (Math.random() * (10-0+1)+0);
+
+            synchronized(mem) {
+                System.out.printf("Thread 1, x = %d, m = %d\n", mem.get(), m);
+                if (mem.get() == -1) {
+                    break;
+                } else if(mem.get() == m) {
+                    System.out.println("RISPOSTA CORRETTA");
+                    mem.set(-1);
+                } else if(Math.abs(m-mem.get()) > 5) {
+                    try {
+                        System.out.println("risposta MOLTO sbagliata");
+                        System.out.println("Thread 1 going to sleep");
+                        mem.wait();
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                        break;
+                    }
+                } else {
+                    System.out.println("risposta sbagliata");
+                }
+            }
+        }
+    }
+}
diff --git a/Year_3/TSDWL/ex_20191218/Thread2.java b/Year_3/TSDWL/ex_20191218/Thread2.java
new file mode 100644
index 0000000..35cb3fe
--- /dev/null
+++ b/Year_3/TSDWL/ex_20191218/Thread2.java
@@ -0,0 +1,28 @@
+public class Thread2 extends Thread {
+    Shared mem;
+    public Thread2(Shared mem) {
+        super();
+        this.mem = mem;
+    }
+
+    public void run() {
+        int m;
+
+        while (true) {
+            try {
+                Thread.sleep(300);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+                break;
+            }
+            synchronized(mem) {
+                if (mem.get() == -1) {
+                    break;
+                }
+
+                System.out.println("\t\t\tThread 2, notify thread 1");
+                mem.notify();
+            }
+        }
+    }
+}