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/*
* Copyright (c) 2024, 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.
*/
/*
* @test id=default
* @bug 8335269
* @summary Test that Thread.yield loop polls for safepoints
* @requires vm.continuations
* @library /test/lib
* @run junit/othervm ThreadPollOnYield
*/
/*
* @test id=c2
* @bug 8335269
* @summary Test that Thread.yield loop polls for safepoints
* @requires vm.continuations & vm.compMode != "Xcomp"
* @library /test/lib
* @run junit/othervm -Xcomp -XX:-TieredCompilation -XX:CompileCommand=inline,*::yield* -XX:CompileCommand=inline,*::*Yield ThreadPollOnYield
*/
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.CountDownLatch;
import jdk.test.lib.thread.VThreadPinner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class ThreadPollOnYield {
private static final CountDownLatch started = new CountDownLatch(1);
static void foo(AtomicBoolean done) {
started.countDown();
while (!done.get()) {
Thread.yield();
}
}
@Test
void testThreadYieldPolls() throws Exception {
AtomicBoolean done = new AtomicBoolean();
var vthread = Thread.ofVirtual().start(() -> {
VThreadPinner.runPinned(() -> foo(done));
});
started.await();
done.set(true);
vthread.join();
System.out.println("First vthread done");
AtomicBoolean done2 = new AtomicBoolean();
vthread = Thread.ofVirtual().start(() -> {
VThreadPinner.runPinned(() -> foo(done2));
});
long start = System.currentTimeMillis();
while (System.currentTimeMillis() - start < 5000) {
Thread.sleep(250);
System.gc();
}
done2.set(true);
vthread.join();
}
}
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