/*

 * Copyright (c) 2007, 2018, 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.

 */

#include <jni.h>

#include <stdio.h>

#include <time.h>

#include "jni_tools.h"

static jfieldID objFieldId = NULL;

/*

 * Class:     nsk_share_gc_lock_jni_StringCriticalLocker

 * Method:    criticalNative

 * Signature: ([Z)Z

 */

JNIEXPORT jchar JNICALL Java_nsk_share_gc_lock_jni_StringCriticalLocker_criticalNative

(JNIEnv *env, jobject this, jlong enterTime, jlong sleepTime) {

        jsize size, i;

        jstring str;

        const jchar *pa;

        jchar hash = 0;

        time_t start_time, current_time;

        if (objFieldId == NULL) {

                jclass class = (*env)->GetObjectClass(env, this);

                if (class == NULL) {

                        printf("Error: GetObjectClass returned NULL\n");

                        return JNI_FALSE;

                }

                objFieldId = (*env)->GetFieldID(env, class, "obj", "Ljava/lang/Object;");

                if (objFieldId == NULL) {

                        printf("Error: GetFieldID returned NULL\n");

                        return JNI_FALSE;

                }

        }

        str = (*env)->GetObjectField(env, this, objFieldId);

        if (str == NULL) {

                printf("Error: GetObjectField returned NULL\n");

                return JNI_FALSE;

        }

        (*env)->SetObjectField(env, this, objFieldId, NULL);

        size = (*env)->GetStringLength(env, str);

        start_time = time(NULL);

        enterTime /= 1000;

        current_time = 0;

        while (current_time - start_time < enterTime) {

                pa = (*env)->GetStringCritical(env, str, NULL);

                if (pa != NULL) {

                        for (i = 0; i < size; ++i)

                                hash ^= pa[i];

                } else {

                        hash = JNI_FALSE;

                }

                mssleep((long) sleepTime);

                (*env)->ReleaseStringCritical(env, str, pa);

                mssleep((long) sleepTime);

                current_time = time(NULL);

        }

        (*env)->SetObjectField(env, this, objFieldId, str);

        return hash;

}