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8294697: java/lang/Thread/virtual/ThreadAPI.testGetStackTrace2 failed with non-empty stack trace

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Reviewed-by: dfuchs, jpai
This commit is contained in:
Alan Bateman 2022-10-06 07:59:43 +00:00
parent e38ae8a651
commit ad7b7d40ce
1 changed files with 6 additions and 36 deletions

42
test/jdk/java/lang/Thread/virtual/ThreadAPI.java

@ -1862,47 +1862,17 @@ public class ThreadAPI {
}
/**
* Test Thread::getStackTrace on thread that has been started but
* has not run.
* Test Thread::getStackTrace on thread that has been started but has not run.
*/
@Test
public void testGetStackTrace2() throws Exception {
if (!ThreadBuilders.supportsCustomScheduler())
throw new SkipException("Requires continuations support");
List<Thread> threads = new ArrayList<>();
AtomicBoolean done = new AtomicBoolean();
try {
Thread target = null;
// start virtual threads that are CPU bound until we find a thread
// that does not run. This is done while holding a monitor to
// allow this test run in the context of a virtual thread.
synchronized (this) {
while (target == null) {
CountDownLatch latch = new CountDownLatch(1);
Thread vthread = Thread.ofVirtual().start(() -> {
latch.countDown();
while (!done.get()) { }
});
threads.add(vthread);
if (!latch.await(3, TimeUnit.SECONDS)) {
// thread did not run
target = vthread;
}
}
}
// stack trace should be empty
StackTraceElement[] stack = target.getStackTrace();
assertTrue(stack.length == 0);
} finally {
done.set(true);
// wait for threads to terminate
for (Thread thread : threads) {
thread.join();
}
}
Executor scheduler = task -> { };
Thread.Builder builder = ThreadBuilders.virtualThreadBuilder(scheduler);
Thread thread = builder.start(() -> { });
StackTraceElement[] stack = thread.getStackTrace();
assertTrue(stack.length == 0);
}
/**