libTestJNIGlobalRefs.c

/*
 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
 *
 * 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 <string.h>

jobject global_ref = NULL;
jobject weak_global_ref = NULL;

JNIEXPORT void JNICALL
Java_TestJNIGlobalRefs_makeGlobalRef(JNIEnv *env, jclass unused, jobject o) {
  global_ref = (*env)->NewGlobalRef(env, o);
}

JNIEXPORT void JNICALL
Java_TestJNIGlobalRefs_makeWeakGlobalRef(JNIEnv *env, jclass unused, jobject o) {
  weak_global_ref = (*env)->NewWeakGlobalRef(env, o);
}

JNIEXPORT jobject JNICALL
Java_TestJNIGlobalRefs_readGlobalRef(JNIEnv *env, jclass unused) {
  return global_ref;
}

JNIEXPORT jobject JNICALL
Java_TestJNIGlobalRefs_readWeakGlobalRef(JNIEnv *env, jclass unused) {
  return weak_global_ref;
}