/*
 * Copyright (c) 2003, 2022, Oracle and/or its affiliates. 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.
 */
import java.io.*;


/*
 * @test
 *
 * @summary converted from VM Testbase nsk/jvmti/SingleStep/singlestep001.
 * VM Testbase keywords: [quick, jpda, jvmti, onload_only_caps, noras]
 * VM Testbase readme:
 * DESCRIPTION
 *     This test exercises the JVMTI event SingleStep.
 *     It verifies that this event can be enabled and disabled during
 *     program execution.
 *     The test works as follows. Breakpoint is set at special method
 *     'bpMethod()'. Upon reaching the breakpoint, agent enables SingleStep
 *     event generation. All the received events are counted. When the
 *     method 'bpMethod()' is leaved and accordingly, the program returns
 *     to the calling method 'runThis()', the agent disables the event
 *     generation.
 *     At least one SingleStep  event must be received for the each method
 *     mentioned above. Also after disabling the event no more events
 *     must be received.
 * COMMENTS
 *
 * @requires vm.continuations
 * @library /test/lib
 * @compile --enable-preview -source ${jdk.version} singlestep01.java
 * @run main/othervm/native --enable-preview -agentlib:singlestep01 singlestep01
 */

public class singlestep01 {
    static {
        System.loadLibrary("singlestep01");
    }

    static volatile int result;
    native int check();

    public static void main(String[] argv) throws Exception {
        Thread thread = Thread.ofPlatform().start(() -> {
             result = new singlestep01().runThis();
        });
        thread.join();
        if (result != 0) {
            throw new RuntimeException("Unexpected status: " + result);
        }
        thread = Thread.ofVirtual().start(() -> {
            result = new singlestep01().runThis();
        });
        thread.join();
        if (result != 0) {
            throw new RuntimeException("Unexpected status: " + result);
        }
    }

    private int runThis() {

        Thread.currentThread().setName("singlestep01Thr");

        System.out.println("\nReaching a breakpoint method ...\n");
        bpMethod();
        System.out.println("The breakpoint method leaved ...");

        return check();
    }

    /**
     * dummy method used only to reach breakpoint set in the agent
     */
    private void bpMethod() {
        int dummyVar = 0;
    }
}