1 files changed, 51 insertions, 0 deletions
diff --git a/tests/features152/synchronization/Useful1.java b/tests/features152/synchronization/Useful1.java
new file mode 100644
index 000000000..d8ecbe3a0
--- /dev/null
+++ b/tests/features152/synchronization/Useful1.java
@@ -0,0 +1,51 @@
+// Exploring synchronization
+
+aspect WithinAspect {
+	long locktimer = 0;
+	int iterations = 0;
+	Object currentObject = null;
+	boolean didSomething = false;
+	long activeTimer;
+	
+	before(Object o ): within(Useful1) && args(o) {
+		if (thisJoinPoint.getSignature().toString().startsWith("lock(")) {
+			activeTimer = System.currentTimeMillis();
+			didSomething = true;
+		}
+	}
+	
+	after(Object o ): within(Useful1) && args(o) {
+		if (thisJoinPoint.getSignature().toString().startsWith("unlock(")) {
+			if (activeTimer!=0) {
+				locktimer+=(System.currentTimeMillis()-activeTimer);
+				iterations++;
+				activeTimer=0;
+				didSomething = true;
+			}
+		}
+	}
+	
+	after() returning: execution(* main(..)) {
+		System.err.println("Average lock taking time over "+iterations+" iterations is "+
+				(((double)locktimer)/
+				 ((double)iterations))+"ms");
+		if (didSomething) System.err.println("We did time something!"); // can write a test looking for this line, it won't vary
+	}
+}
+
+public class Useful1 {
+	public static void main(String[] args) {
+		Useful1 u = new Useful1();
+		
+		for (int i = 0; i < 2000; i++) {
+			u.methodWithSynchronizedBlock();
+		}
+	}
+	
+	public void methodWithSynchronizedBlock() {
+		synchronized (this) {
+			for (int ii=0;ii<100;ii++);
+		}
+	}
+
+}