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/*
* Copyright (c) 2019, 2023, 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
* @summary Test Virtual threads using thread locals
* @library /test/lib
* @run junit ThreadLocals
*/
import jdk.test.lib.thread.VThreadRunner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class ThreadLocals {
static final ThreadLocal<Object> LOCAL = new ThreadLocal<>();
static final ThreadLocal<Object> INHERITED_LOCAL = new InheritableThreadLocal<>();
/**
* Basic test of thread local set/get.
*/
@Test
void testThreadLocal1() throws Exception {
for (int i = 0; i < 10; i++) {
VThreadRunner.run(() -> {
assertNull(LOCAL.get());
Object obj = new Object();
LOCAL.set(obj);
assertTrue(LOCAL.get() == obj);
});
}
}
/**
* Test setting thread local before blocking operation.
*/
@Test
void testThreadLocal2() throws Exception {
VThreadRunner.run(() -> {
assertNull(LOCAL.get());
Object obj = new Object();
LOCAL.set(obj);
try { Thread.sleep(100); } catch (InterruptedException e) { }
assertTrue(LOCAL.get() == obj);
});
}
/**
* Basic test of inheritable thread local set/get, no initial value inherited.
*/
@Test
void testInheritedThreadLocal1() throws Exception {
assertNull(INHERITED_LOCAL.get());
for (int i = 0; i < 10; i++) {
VThreadRunner.run(() -> {
assertNull(INHERITED_LOCAL.get());
Object obj = new Object();
INHERITED_LOCAL.set(obj);
assertTrue(INHERITED_LOCAL.get() == obj);
});
}
assertNull(INHERITED_LOCAL.get());
}
/**
* Test inheriting initial value of InheritableThreadLocal from platform thread.
*/
@Test
void testInheritedThreadLocal2() throws Exception {
assertNull(INHERITED_LOCAL.get());
var obj = new Object();
INHERITED_LOCAL.set(obj);
try {
VThreadRunner.run(() -> {
assertTrue(INHERITED_LOCAL.get() == obj);
});
} finally {
INHERITED_LOCAL.remove();
}
}
/**
* Test inheriting initial value of InheritableThreadLocal from virtual thread.
*/
@Test
void testInheritedThreadLocal3() throws Exception {
assertNull(INHERITED_LOCAL.get());
VThreadRunner.run(() -> {
var obj = new Object();
INHERITED_LOCAL.set(obj);
VThreadRunner.run(() -> {
assertTrue(INHERITED_LOCAL.get() == obj);
});
assertTrue(INHERITED_LOCAL.get() == obj);
});
assertNull(INHERITED_LOCAL.get());
}
/**
* Test Thread that does not inherit initial value of InheritableThreadLocals
* from platform thread.
*/
@Test
void testInheritedThreadLocal4() throws Exception {
assertNull(INHERITED_LOCAL.get());
var obj = new Object();
INHERITED_LOCAL.set(obj);
try {
int characteristics = VThreadRunner.NO_INHERIT_THREAD_LOCALS;
VThreadRunner.run(characteristics, () -> {
assertNull(INHERITED_LOCAL.get());
});
} finally {
INHERITED_LOCAL.remove();
}
}
/**
* Test Thread that does not inherit initial value of InheritableThreadLocals
* from virtual thread.
*/
@Test
void testInheritedThreadLocal5() throws Exception {
assertNull(INHERITED_LOCAL.get());
VThreadRunner.run(() -> {
var obj = new Object();
INHERITED_LOCAL.set(obj);
int characteristics = VThreadRunner.NO_INHERIT_THREAD_LOCALS;
VThreadRunner.run(characteristics, () -> {
assertNull(INHERITED_LOCAL.get());
});
assertTrue(INHERITED_LOCAL.get() == obj);
});
assertNull(INHERITED_LOCAL.get());
}
}
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