1 package org.openjdk.bench.vm.gc.barriers.reads;
 2 
 3 import org.openjdk.jmh.annotations.*;
 4 import java.lang.ref.WeakReference;
 5 
 6 import java.util.concurrent.TimeUnit;
 7 
 8 @Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
 9 @Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
10 @Fork(3)
11 @BenchmarkMode(Mode.AverageTime)
12 @OutputTimeUnit(TimeUnit.NANOSECONDS)
13 @State(Scope.Thread)
14 public class WeakRef {
15 
16     WeakReference<Target> src;
17 
18     @Setup
19     public void setup() {
20         src = new WeakReference<>(new Target());
21     }
22 
23     @Benchmark
24     @CompilerControl(CompilerControl.Mode.DONT_INLINE)
25     public Object test_ref() {
26         return src.get();
27     }
28 
29     static class Target {
30         int dummy;
31     }
32 }