Quelle TestSpinPause.java Sprache: JAVA

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/**
* @test TestSpinPause
* @summary JVM runtime can use SpinPause function for synchronized statements.
*          Check different implementations of JVM SpinPause don't crash JVM.
* @bug 8278241
* @library /test/lib
*
* @requires os.arch=="aarch64"
*
* @run main/othervm TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=none TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=nop TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=isb TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=yield TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=nop -XX:OnSpinWaitInstCount=10 TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=isb -XX:OnSpinWaitInstCount=3 TestSpinPause
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=yield -XX:OnSpinWaitInstCount=3 TestSpinPause
* @run main/othervm -Xint TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=none TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=nop TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=isb TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=yield TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=nop -XX:OnSpinWaitInstCount=10 TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=isb -XX:OnSpinWaitInstCount=3 TestSpinPause
* @run main/othervm -Xint -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=yield -XX:OnSpinWaitInstCount=3 TestSpinPause
* @run main/othervm -Xcomp TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=none TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=nop TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=isb TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=yield TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=nop -XX:OnSpinWaitInstCount=10 TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=isb -XX:OnSpinWaitInstCount=3 TestSpinPause
* @run main/othervm -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:OnSpinWaitInst=yield -XX:OnSpinWaitInstCount=3 TestSpinPause
*/

public class TestSpinPause {
    private Integer[] valueHolder;

    private TestSpinPause () {
        valueHolder = new Integer[] {Integer.valueOf(101)};
    }

    private void getSet() {
        final int iterCount = 100;
        for (int i = 0; i < iterCount; ++i) {
           synchronized (valueHolder) {
               Integer v = valueHolder[0];
               valueHolder[0] = Integer.reverse(v);
           }
        }
    }

    public static void main(String[] args) throws Exception {
        TestSpinPause test = new TestSpinPause();
        Thread t1 = new Thread(test::getSet);
        Thread t2 = new Thread(test::getSet);
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("Done: " + test.valueHolder[0]);
    }
}

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