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 * 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
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 *
 * 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.
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package org.openjdk.bench.java.lang;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.*;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Benchmark)
@Warmup(iterations = 10, time = 1)
@Measurement(iterations = 10, time = 1)
@Fork(value = 3)
public class ThreadGetStackTraceWhenSpinning {
    private volatile boolean done;
    private Thread thread;

    @Setup
    public void setup() throws InterruptedException {
        var started = new CountDownLatch(1);
        thread = Thread.ofPlatform().start(() -> {
            started.countDown();
            while (!done) {
                Thread.onSpinWait();
            }
        });
        started.await();
    }

    @TearDown
    public void shutdown() throws InterruptedException {
        done = true;
        thread.join();
    }

    @Benchmark
    public StackTraceElement[] testGetStackTrace() {
        return thread.getStackTrace();
    }
}
