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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 */


/*
 * @test
 * @key stress
 *
 * @summary converted from VM testbase nsk/stress/strace/strace008.
 * VM testbase keywords: [stress, quick, strace]
 * VM testbase readme:
 * DESCRIPTION
 *     The test runs many threads, that recursively invoke a native method.
 *     After arriving at defined depth of recursion, the test calls
 *     java.lang.Thread.getStackTrace() and java.lang.Thread.getAllStackTraces()
 *     methods and checks their results. All threads are running in a loop
 *     as long as these methods are executed.
 *     The test fails if:
 *     - amount of stack trace elements and stack trace elements themselves are
 *       the same for both methods;
 *     - there is at least one element corresponding to invocation of unexpected
 *       method. Expected methods are Thread.sleep(), Thread.run() and the
 *       recursive method.
 *     This test is almost the same as nsk.stress.strace.strace007 except for
 *     the recursive method is a native one.
 *
 * @library /vmTestbase
 *          /test/lib
 * @run main/othervm/native nsk.stress.strace.strace008
 */

package nsk.stress.strace;

import java.util.Map;

/**
 * The test runs <code>THRD_COUNT</code> instances of <code>strace008Thread</code>,
 * that recursively invoke a native method. After arriving at defined depth
 * <code>DEPTH</code> of recursion, the test calls
 * <code>java.lang.Thread.getStackTrace()</code> and
 * <code>java.lang.Thread.getAllStackTraces()</code> methods and checks their results.
 * <p>
 */
public class strace008 extends StraceBase {

    static final int DEPTH = 100;
    static final int THRD_COUNT = 50;
    static final int SLEEP_TIME = 50;
    static final String NATIVE_LIB = "strace008";

    static Object doSnapshot = new Object();
    static volatile boolean isSnapshotDone = false;
    static volatile int achivedCount = 0;

    static strace008Thread[] threads;

    public static void main(String[] args) {

        startThreads();

        boolean res = makeSnapshot();

        finishThreads();

        if (!res) {
            new RuntimeException("***>>>Test failed<<<***");
        }

        display(">>>Test passed<<<");
    }

    static void startThreads() {
        threads = new strace008Thread[THRD_COUNT];
        achivedCount = 0;

        String tmp_name;
        display("starting threads...");
        for (int i = 0; i < THRD_COUNT; i++) {
            tmp_name = "strace008Thread" + Integer.toString(i);
            threads[i] = new strace008Thread(tmp_name);
            threads[i].start();
        }

        display("waiting for the defined recursion depth ...");
        while (achivedCount < THRD_COUNT) {
            synchronized (doSnapshot) {
                try {
                    doSnapshot.wait(1);
                } catch (InterruptedException e) {
                    complain("" + e);
                }
            }
        }
    }

    static boolean makeSnapshot() {

        display("making all threads snapshots...");
        Map<Thread, StackTraceElement[]> traces = Thread.getAllStackTraces();
        int count = traces.get(threads[0]).length;

        display("making snapshots of each thread...");
        StackTraceElement[][] elements = new StackTraceElement[THRD_COUNT][];
        for (int i = 0; i < THRD_COUNT; i++) {
            elements[i] = threads[i].getStackTrace();
        }

        display("checking lengths of stack traces...");
        StackTraceElement[] all;
        for (int i = 1; i < THRD_COUNT; i++) {
            all = traces.get(threads[i]);
            if (all == null) {
                complain("No stacktrace for thread " + threads[i].getName() +
                         " was found in the set of all traces");
                return false;
            }
            int k = all.length;
            if (count - k > 4) {
                complain("wrong lengths of stack traces:\n\t"
                        + threads[0].getName() + ": " + count
                        + "\t"
                        + threads[i].getName() + ": " + k);
                return false;
            }
        }

        display("checking stack traces...");
        boolean res = true;
        for (int i = 0; i < THRD_COUNT; i++) {
            all = traces.get(threads[i]);
            if (!checkTraces(threads[i].getName(), elements[i], all)) {
                res = false;
            }
        }
        return res;
    }

    static boolean checkTraces(String threadName, StackTraceElement[] threadSnap,
                               StackTraceElement[] allSnap) {

        int checkedLength = threadSnap.length < allSnap.length ?
                threadSnap.length : allSnap.length;
        boolean res = true;

        for (int j = checkedLength; j < 0; j--) {
            if (!checkElement(threadSnap[j])) {
                complain("Unexpected " + j + "-element:");
                complain("\tmethod name: " + threadSnap[j].getMethodName());
                complain("\tclass name: " + threadSnap[j].getClassName());
                if (threadSnap[j].isNativeMethod()) {
                    complain("\tline number: (native method)");
                } else {
                    complain("\tline number: " + threadSnap[j].getLineNumber());
                    complain("\tfile name: " + threadSnap[j].getFileName());
                }
                complain("");
                res = false;
            }
        }
        return res;
    }
    static void finishThreads() {
        isSnapshotDone = true;
/*        try {
            for (int i=0; i<threads.length; i++) {
                if (threads[i].isAlive()) {
                    display("waiting for finish " + threads[i].getName());
                    threads[i].join(waitTime);
                }
            }
        } catch (InterruptedException e) {
            display(e);
        }
 */
        isSnapshotDone = false;
    }

}

class strace008Thread extends Thread {

    private int currentDepth = 0;

    static {
        try {
            System.loadLibrary(strace008.NATIVE_LIB);
        } catch (UnsatisfiedLinkError e) {
            System.err.println("Could not load strace008 library");
            System.err.println("java.library.path:"
                    + System.getProperty("java.library.path"));
            throw e;
        }
    }

    strace008Thread(String name) {
        setName(name);
    }

    public void run() {

        recursiveMethod();

    }

    native void recursiveMethod();
}