/*
 * Copyright (c) 2021, Red Hat, Inc. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package org.openjdk.bench.vm.fences;

import org.openjdk.jmh.annotations.*;

import java.lang.invoke.VarHandle;
import java.util.concurrent.TimeUnit;

@Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(value = 3, jvmArgs = {"-XX:+UseParallelGC", "-Xmx128m"})
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
public class SafePublishing {

    @Benchmark
    public Object plain() {
        return new Plain();
    }

    @Benchmark
    public Object release() {
        return new Release();
    }

    @Benchmark
    public Object storeStore() {
        return new StoreStore();
    }

    static class Plain {
        int x;
        public Plain() {
            x = 1;
            VarHandle.releaseFence();
        }
    }

    static class Release {
        int x;
        public Release() {
            x = 1;
            VarHandle.releaseFence();
        }
    }

    static class StoreStore {
        int x;
        public StoreStore() {
            x = 1;
            VarHandle.storeStoreFence();
        }
    }

}