11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /**
25 * @test
26 * @summary Test Thread.yield submits the virtual thread task to the expected queue
27 * @requires vm.continuations
28 * @run junit/othervm -Djdk.virtualThreadScheduler.maxPoolSize=1 YieldQueuing
29 */
30
31 import java.util.List;
32 import java.util.concurrent.CopyOnWriteArrayList;
33 import java.util.concurrent.atomic.AtomicBoolean;
34 import java.util.concurrent.locks.LockSupport;
35
36 import org.junit.jupiter.api.Test;
37 import static org.junit.jupiter.api.Assertions.*;
38
39 class YieldQueuing {
40
41 /**
42 * Test Thread.yield submits the task for the current virtual thread to a scheduler
43 * submission queue when there are no tasks in the local queue.
44 */
45 @Test
46 void testYieldWithEmptyLocalQueue() throws Exception {
47 var list = new CopyOnWriteArrayList<String>();
48
49 var threadsStarted = new AtomicBoolean();
50
51 var threadA = Thread.ofVirtual().unstarted(() -> {
52 // pin thread until task for B is in submission queue
53 while (!threadsStarted.get()) {
54 Thread.onSpinWait();
55 }
56
57 list.add("A");
58 Thread.yield(); // push task for A to submission queue, B should run
59 list.add("A");
60 });
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /**
25 * @test
26 * @summary Test Thread.yield submits the virtual thread task to the expected queue
27 * @requires vm.continuations
28 * @run junit/othervm -Djdk.virtualThreadScheduler.maxPoolSize=1 YieldQueuing
29 */
30
31 import java.lang.invoke.MethodHandles;
32 import java.util.List;
33 import java.util.concurrent.CopyOnWriteArrayList;
34 import java.util.concurrent.atomic.AtomicBoolean;
35 import java.util.concurrent.locks.LockSupport;
36
37 import org.junit.jupiter.api.Test;
38 import org.junit.jupiter.api.BeforeAll;
39 import static org.junit.jupiter.api.Assertions.*;
40
41 class YieldQueuing {
42
43 @BeforeAll
44 static void setup() throws Exception {
45 // waiting for LockSupport to be initialized can change the scheduling
46 MethodHandles.lookup().ensureInitialized(LockSupport.class);
47 }
48
49 /**
50 * Test Thread.yield submits the task for the current virtual thread to a scheduler
51 * submission queue when there are no tasks in the local queue.
52 */
53 @Test
54 void testYieldWithEmptyLocalQueue() throws Exception {
55 var list = new CopyOnWriteArrayList<String>();
56
57 var threadsStarted = new AtomicBoolean();
58
59 var threadA = Thread.ofVirtual().unstarted(() -> {
60 // pin thread until task for B is in submission queue
61 while (!threadsStarted.get()) {
62 Thread.onSpinWait();
63 }
64
65 list.add("A");
66 Thread.yield(); // push task for A to submission queue, B should run
67 list.add("A");
68 });
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