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Patches for java.lang.ref.PhantomReference.phantom and WeakReference.weak
- From: Ingo Prötel <proetel at aicas dot com>
- To: mauve-patches at sources dot redhat dot com
- Date: Wed, 13 Aug 2003 18:26:55 +0200
- Subject: Patches for java.lang.ref.PhantomReference.phantom and WeakReference.weak
Hi,
I propose attached patches.
Background is that a single System.gc does not guarantee that the weakly
referenced object is collected (especially on systems with incremental
garbage collection). But forcing the VM into an out-of-memory situation
should result in the collection of all available garbage. Since
finalization is checked also the Runtime.runFinalization() should be
called.
This makes also a nice test if a VM recovers nicely from an
out-of-memory situation :-)
Thanks
--ingo
diff -Naur mauve.org/gnu/testlet/java/lang/ref/WeakReference/weakref.java Mauve/gnu/testlet/java/lang/ref/WeakReference/weakref.java
--- mauve.org/gnu/testlet/java/lang/ref/WeakReference/weakref.java 2001-09-27 17:44:09.000000000 +0200
+++ Mauve/gnu/testlet/java/lang/ref/WeakReference/weakref.java 2003-08-13 18:11:09.000000000 +0200
@@ -43,7 +43,14 @@
Integer twt = new Integer (23);
WeakReference wr = genRef (q, twt);
- System.gc ();
+ try
+ {
+ long[] suckUpAllMemory = new long[(int)(Runtime.getRuntime().totalMemory()/8)];
+ }
+ catch (OutOfMemoryError e)
+ {
+ }
+ Runtime.getRuntime().runFinalization();
Reference r = q.poll ();
harness.check (r, null, "live reference");
@@ -58,8 +65,16 @@
ReferenceQueue q = new ReferenceQueue ();
WeakReference wr = try1 (q, harness);
- System.gc ();
-
+ try
+ {
+ long[] suckUpAllMemory = new long[(int)(Runtime.getRuntime().totalMemory()/8)];
+ }
+ catch (OutOfMemoryError e)
+ {
+ }
+ Runtime.getRuntime().runFinalization();
+
+
Reference r = null;
try
{
diff -Naur mauve.org/gnu/testlet/java/lang/ref/PhantomReference/phantom.java Mauve/gnu/testlet/java/lang/ref/PhantomReference/phantom.java
--- mauve.org/gnu/testlet/java/lang/ref/PhantomReference/phantom.java 2001-09-27 17:44:09.000000000 +0200
+++ Mauve/gnu/testlet/java/lang/ref/PhantomReference/phantom.java 2003-08-13 18:09:04.000000000 +0200
@@ -54,7 +54,14 @@
phantom twt = new phantom ();
PhantomReference wr = genRef (q, twt);
- System.gc ();
+ try
+ {
+ long[] suckUpAllMemory = new long[(int)(Runtime.getRuntime().totalMemory()/8)];
+ }
+ catch (OutOfMemoryError e)
+ {
+ }
+ Runtime.getRuntime().runFinalization();
Reference r = q.poll ();
harness.check (r, null, "live reference");
@@ -69,8 +76,16 @@
ReferenceQueue q = new ReferenceQueue ();
PhantomReference wr = try1 (q, harness);
- System.gc ();
-
+
+ try
+ {
+ long[] suckUpAllMemory = new long[(int)(Runtime.getRuntime().totalMemory()/8)];
+ }
+ catch (OutOfMemoryError e)
+ {
+ }
+ Runtime.getRuntime().runFinalization();
+
Reference r = null;
try
{