76 lines
2.6 KiB
Java
76 lines
2.6 KiB
Java
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/*
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* Copyright (c) 2024, Oracle and/or its affiliates. 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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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.lang.foreign.Arena;
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import java.lang.foreign.FunctionDescriptor;
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import java.lang.foreign.Linker;
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import java.util.concurrent.CountDownLatch;
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import jdk.test.lib.apps.LingeredApp;
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public class LingeredAppWithFFMUpcall extends LingeredApp {
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public static final String THREAD_NAME = "Upcall thread";
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private static final Object lockObj = new Object();
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private static final CountDownLatch signal = new CountDownLatch(1);
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static {
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System.loadLibrary("upcall");
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}
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public static void upcall() {
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signal.countDown();
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synchronized(lockObj) {
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}
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}
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public static long createFunctionPointerForUpcall() throws NoSuchMethodException, IllegalAccessException {
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var mh = MethodHandles.lookup()
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.findStatic(LingeredAppWithFFMUpcall.class, "upcall", MethodType.methodType(void.class));
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var stub = Linker.nativeLinker()
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.upcallStub(mh, FunctionDescriptor.ofVoid(), Arena.global());
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return stub.address();
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}
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public static native void callJNI(long upcallAddr);
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public static void main(String[] args) {
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try {
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long upcallAddr = createFunctionPointerForUpcall();
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var upcallThread = new Thread(() -> callJNI(upcallAddr), THREAD_NAME);
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synchronized(lockObj) {
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upcallThread.start();
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signal.await();
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LingeredApp.main(args);
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}
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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}
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