--- a/test/jdk/java/util/concurrent/ConcurrentQueues/GCRetention.java Tue May 22 21:46:51 2018 -0700
+++ b/test/jdk/java/util/concurrent/ConcurrentQueues/GCRetention.java Tue May 22 21:50:45 2018 -0700
@@ -38,8 +38,9 @@
* @run main GCRetention just-testing
*/
-import static java.util.concurrent.TimeUnit.SECONDS;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
@@ -65,16 +66,22 @@
/** No guarantees, but effective in practice. */
static void forceFullGc() {
- CountDownLatch finalizeDone = new CountDownLatch(1);
- WeakReference<?> ref = new WeakReference<Object>(new Object() {
- protected void finalize() { finalizeDone.countDown(); }});
+ long timeoutMillis = 1000L;
+ CountDownLatch finalized = new CountDownLatch(1);
+ ReferenceQueue<Object> queue = new ReferenceQueue<>();
+ WeakReference<Object> ref = new WeakReference<>(
+ new Object() { protected void finalize() { finalized.countDown(); }},
+ queue);
try {
- for (int i = 0; i < 10; i++) {
+ for (int tries = 3; tries--> 0; ) {
System.gc();
- if (finalizeDone.await(1L, SECONDS) && ref.get() == null) {
+ if (finalized.await(timeoutMillis, MILLISECONDS)
+ && queue.remove(timeoutMillis) != null
+ && ref.get() == null) {
System.runFinalization(); // try to pick up stragglers
return;
}
+ timeoutMillis *= 4;
}
} catch (InterruptedException unexpected) {
throw new AssertionError("unexpected InterruptedException");