1 files changed, 47 insertions, 0 deletions
diff --git a/tests/features152/synchronization/Useful2.java b/tests/features152/synchronization/Useful2.java
new file mode 100644
index 000000000..46fc82d5a
--- /dev/null
+++ b/tests/features152/synchronization/Useful2.java
@@ -0,0 +1,47 @@
+// Exploring synchronization
+
+aspect LockMonitor {
+	long locktimer = 0;
+	int iterations = 0;
+	Object currentObject = null;
+	long activeTimer;
+	
+	before(Useful2 o ): lock() && args(o) {
+		activeTimer = System.currentTimeMillis();
+		currentObject = o;
+	}
+	
+	after(Useful2 o ): unlock() && args(o) {
+		if (o!=currentObject) { 
+			throw new RuntimeException("Unlocking on incorrect thing?!?");
+		}
+		if (activeTimer!=0) {
+			locktimer+=(System.currentTimeMillis()-activeTimer);
+			iterations++;
+			activeTimer=0;
+		}
+	}
+	
+	after() returning: execution(* main(..)) {
+		System.err.println("Average time spent with lock over "+iterations+" iterations is "+
+				(((double)locktimer)/
+				 ((double)iterations))+"ms");
+	}
+}
+
+public class Useful2 {
+	public static void main(String[] args) {
+		Useful2 u = new Useful2();
+		
+		for (int i = 0; i < 20; i++) {
+			u.methodWithSynchronizedBlock();
+		}
+	}
+	
+	public void methodWithSynchronizedBlock() {
+		synchronized (this) {
+			for (int ii=0;ii<1000000;ii++);
+		}
+	}
+
+}