68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2021, BELLSOFT. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdio.h>
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#include "jni.h"
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static volatile jobject ref = NULL;
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JNIEXPORT jint JNICALL
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JNI_OnLoad(JavaVM *vm, void *reserved)
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{
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JNIEnv *env;
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printf("Native library loaded.\n");
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fflush(stdout);
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if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
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return JNI_EVERSION; /* JNI version not supported */
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}
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return JNI_VERSION_1_2;
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}
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JNIEXPORT void JNICALL Java_p_Class1_setRef(JNIEnv *env, jobject this, jobject obj) {
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if (ref == NULL) {
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// Only create a single GlobalRef
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ref = (*env)->NewGlobalRef(env, obj);
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printf("GlobalRef created\n");
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}
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}
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JNIEXPORT void JNICALL
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JNI_OnUnload(JavaVM *vm, void *reserved) {
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if (ref != NULL) {
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JNIEnv *env = NULL;
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if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
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return; /* JNI version not supported */
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}
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(*env)->DeleteGlobalRef(env, ref);
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printf("GlobalRef deleted\n");
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}
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printf("Native library unloaded.\n");
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fflush(stdout);
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}
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