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import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

/**
 * @test
 * @summary If #processors > 1024 os_linux.cpp uses special coding.
 *   Excercise this by forcing usage of this coding. If this fails, this
 *   VM was either compiled on a platform which does not define CPU_ALLOC,
 *   or it is executed on a platform that does not support it.
 * @requires os.family == "linux"
 * @requires vm.flagless
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @run driver TestUseCpuAllocPath
 */
public class TestUseCpuAllocPath {

    static final String SUCCESS_STRING = "active_processor_count: using dynamic path (forced)";

    public static void main(String[] args) throws Exception {
        ProcessBuilder pb =
            ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:os=trace",
                                                             "-XX:+UnlockDiagnosticVMOptions",
                                                             "-XX:+UseCpuAllocPath",
                                                             "-version");

        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldHaveExitValue(0);
        output.shouldContain(SUCCESS_STRING);
    }
}