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/**

 * @test

 * @bug 6869327

 * @summary Test that C2 flag UseCountedLoopSafepoints ensures a safepoint is kept in a CountedLoop

 * @library /testlibrary

 * @modules java.base

 * @run main UseCountedLoopSafepoints

 */

import java.util.concurrent.atomic.AtomicLong;

import jdk.test.lib.ProcessTools;

import jdk.test.lib.OutputAnalyzer;

public class UseCountedLoopSafepoints {

    private static final AtomicLong _num = new AtomicLong(0);

    // Uses the fact that an EnableBiasedLocking vmop will be started

    // after 500ms, while we are still in the loop. If there is a

    // safepoint in the counted loop, then we will reach safepoint

    // very quickly. Otherwise SafepointTimeout will be hit.

    public static void main (String args[]) throws Exception {

        if (args.length == 1) {

            final int loops = Integer.parseInt(args[0]);

            for (int i = 0; i < loops; i++) {

                _num.addAndGet(1);

            }

        } else {

            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

                    "-XX:+IgnoreUnrecognizedVMOptions",

                    "-XX:-TieredCompilation",

                    "-XX:+UseBiasedLocking",

                    "-XX:BiasedLockingStartupDelay=500",

                    "-XX:+SafepointTimeout",

                    "-XX:SafepointTimeoutDelay=2000",

                    "-XX:+UseCountedLoopSafepoints",

                    "UseCountedLoopSafepoints",

                    "2000000000"

                    );

            OutputAnalyzer output = new OutputAnalyzer(pb.start());

            output.shouldNotContain("Timeout detected");

            output.shouldHaveExitValue(0);

        }

    }

}