| 34 |
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| 35 |
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import jdk.test.lib.RandomFactory; |
| 36 |
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| 37 |
+ |
import java.lang.ref.ReferenceQueue; |
| 38 |
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import java.lang.ref.WeakReference; |
| 39 |
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import java.util.Arrays; |
| 40 |
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import java.util.Iterator; |
| 45 |
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import java.util.concurrent.CountDownLatch; |
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import java.util.function.BooleanSupplier; |
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| 48 |
< |
import static java.util.concurrent.TimeUnit.SECONDS; |
| 48 |
> |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 49 |
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| 50 |
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public class GCDuringIteration { |
| 51 |
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| 52 |
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/** No guarantees, but effective in practice. */ |
| 53 |
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static void forceFullGc() { |
| 54 |
+ |
long timeoutMillis = 1000L; |
| 55 |
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CountDownLatch finalizeDone = new CountDownLatch(1); |
| 56 |
< |
WeakReference<?> ref = new WeakReference<Object>(new Object() { |
| 57 |
< |
protected void finalize() { finalizeDone.countDown(); }}); |
| 56 |
> |
ReferenceQueue<Object> queue = new ReferenceQueue<>(); |
| 57 |
> |
WeakReference<Object> ref = new WeakReference<>( |
| 58 |
> |
new Object() { |
| 59 |
> |
protected void finalize() { finalizeDone.countDown(); }}, |
| 60 |
> |
queue); |
| 61 |
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try { |
| 62 |
< |
for (int i = 0; i < 10; i++) { |
| 62 |
> |
for (int tries = 3; tries--> 0; ) { |
| 63 |
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System.gc(); |
| 64 |
< |
if (finalizeDone.await(1L, SECONDS) && ref.get() == null) { |
| 64 |
> |
if (finalizeDone.await(timeoutMillis, MILLISECONDS) |
| 65 |
> |
&& queue.remove(timeoutMillis) != null |
| 66 |
> |
&& ref.get() == null) { |
| 67 |
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System.runFinalization(); // try to pick up stragglers |
| 68 |
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return; |
| 69 |
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} |
| 70 |
+ |
timeoutMillis *= 4; |
| 71 |
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} |
| 72 |
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} catch (InterruptedException unexpected) { |
| 73 |
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throw new AssertionError("unexpected InterruptedException"); |
