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/*
* 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.
*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Martin Buchholz with assistance from members of JCP
* JSR-166 Expert Group and released to the public domain, as
* explained at http://creativecommons.org/publicdomain/zero/1.0/
*/
/*
* @test
* @bug 8022642 8065320 8129861
* @summary Ensure relative sanity when zero core threads
* @library /lib/testlibrary/
* @modules java.base/java.util.concurrent:open
*/
import static java.util.concurrent.TimeUnit.HOURS;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.lang.reflect.Field;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.BooleanSupplier;
import jdk.testlibrary.Utils;
public class ZeroCoreThreads {
static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
static long millisElapsedSince(long startTime) {
return (System.nanoTime() - startTime) / (1000L * 1000L);
}
static void spinWaitUntil(BooleanSupplier predicate, long timeoutMillis) {
long startTime = -1L;
while (!predicate.getAsBoolean()) {
if (startTime == -1L)
startTime = System.nanoTime();
else if (millisElapsedSince(startTime) > timeoutMillis)
throw new AssertionError(
String.format("timed out after %s ms", timeoutMillis));
Thread.yield();
}
}
static boolean hasWaiters(ReentrantLock lock, Condition condition) {
lock.lock();
try {
return lock.hasWaiters(condition);
} finally {
lock.unlock();
}
}
static void awaitHasWaiters(ReentrantLock lock, Condition condition,
long timeoutMillis) {
spinWaitUntil(() -> hasWaiters(lock, condition), timeoutMillis);
}
static <T> T getField(Object x, String fieldName) {
try {
Field field = x.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
return (T) field.get(x);
} catch (ReflectiveOperationException ex) {
throw new AssertionError(ex);
}
}
void test(String[] args) throws Throwable {
ScheduledThreadPoolExecutor p = new ScheduledThreadPoolExecutor(0);
try {
test(p);
} finally {
p.shutdownNow();
check(p.awaitTermination(LONG_DELAY_MS, MILLISECONDS));
}
}
void test(ScheduledThreadPoolExecutor p) throws Throwable {
Runnable dummy = new Runnable() { public void run() {
throw new AssertionError("shouldn't get here"); }};
BlockingQueue q = p.getQueue();
ReentrantLock lock = getField(q, "lock");
Condition available = getField(q, "available");
equal(0, p.getPoolSize());
equal(0, p.getLargestPoolSize());
equal(0L, p.getTaskCount());
equal(0L, p.getCompletedTaskCount());
p.schedule(dummy, 1L, HOURS);
// Ensure one pool thread actually waits in timed queue poll
awaitHasWaiters(lock, available, LONG_DELAY_MS);
equal(1, p.getPoolSize());
equal(1, p.getLargestPoolSize());
equal(1L, p.getTaskCount());
equal(0L, p.getCompletedTaskCount());
}
//--------------------- Infrastructure ---------------------------
volatile int passed = 0, failed = 0;
void pass() {passed++;}
void fail() {failed++; Thread.dumpStack();}
void fail(String msg) {System.err.println(msg); fail();}
void unexpected(Throwable t) {failed++; t.printStackTrace();}
void check(boolean cond) {if (cond) pass(); else fail();}
void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
new ZeroCoreThreads().instanceMain(args);}
void instanceMain(String[] args) throws Throwable {
try {test(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}
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