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BasicExp.java
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BasicExp.java
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/*
* Copyright (c) 2022 SAP SE. 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.
*
*/
/**
* @test
* @summary Collection of basic continuation experiments. Used only during development. TODO_LOOM_PPC_PORT: remove again.
* @modules java.base/jdk.internal.vm
* @library /test/lib
* @run main/othervm --enable-preview BasicExp
*/
import java.time.Duration;
import jdk.internal.vm.Continuation;
import jdk.internal.vm.ContinuationScope;
import jdk.test.lib.Asserts;
public class BasicExp {
static final ContinuationScope THE_SCOPE = new ContinuationScope() {};
public static void main(String[] args) {
new ContinuationRunYieldRunTest().runTestCase();
}
/**
* Base class for testcases
*/
public static abstract class TestCaseBase implements Runnable {
public void log() {
System.out.println();
}
public void log(String m) {
System.out.println(m);
}
public void runTestCase() {
log(">>> Executing test case " + getClass().getName());
try {
testEntry();
} finally {
log("<<< Finished test case " + getClass().getName()); log();
}
}
public abstract void testEntry();
@Override
public void run() {
Asserts.fail("Should not call TestCaseBase::run");
}
public void sleep(Duration d) {
try { Thread.sleep(d); }
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
* Trivial run/yield/run test
*/
public static class ContinuationRunYieldRunTest extends TestCaseBase {
@Override
public void testEntry() {
Continuation cont = new Continuation(THE_SCOPE, () -> run());
do {
cont.run();
} while (!cont.isDone());
}
public void run() {
log("Continuation running on thread " + Thread.currentThread());
Continuation.yield(THE_SCOPE);
}
}
}