[Jikesrvm-commits] SF.net SVN: jikesrvm: [13252] rvmroot/trunk/testing/tests/gctest/src/ ReferenceTest.java

[<dfr...@us...>]

Revision: 13252
          http://jikesrvm.svn.sourceforge.net/jikesrvm/?rev=13252&view=rev
Author:   dframpton-oss
Date:     2007-08-09 01:05:24 -0700 (Thu, 09 Aug 2007)

Log Message:
-----------
Improve ReferenceTest to correctly test soft reference semantics.

Modified Paths:
--------------
    rvmroot/trunk/testing/tests/gctest/src/ReferenceTest.java

Modified: rvmroot/trunk/testing/tests/gctest/src/ReferenceTest.java
===================================================================
--- rvmroot/trunk/testing/tests/gctest/src/ReferenceTest.java	2007-08-09 06:14:14 UTC (rev 13251)
+++ rvmroot/trunk/testing/tests/gctest/src/ReferenceTest.java	2007-08-09 08:05:24 UTC (rev 13252)
@@ -62,12 +62,19 @@
         dummy = allocateUnit();
   }
 
-  public static Object allocateHold (double amt) { // amt in Mb
-    int rounds = MBtoUnits(amt);
-    Object [] a = new Object[rounds];
-    for (int i=0; i<rounds; i++)
-        a[i] = allocateUnit();
-    return a;
+  private static Object outOfMemoryHandle;
+
+  public static void allocateUntilOOM () {
+    try {
+      while(true) {
+        Object[] myArray = new Object[10000];
+        myArray[0] = outOfMemoryHandle;
+        outOfMemoryHandle = myArray;
+      }
+    } catch (OutOfMemoryError oome) {
+      outOfMemoryHandle = null;
+      System.out.println("Caught OutOfMemoryError");
+    }
   }
 
   public static double allocateUntilNextGC() {
@@ -169,7 +176,7 @@
       Reference<Object[]> [] sra = allocateReferenceArray(SOFT, 0.75 * initialHeapSize, srq);
       double softAvail = checkReferenceArray(sra, srq);
       check("Fraction of soft references before GC still live = " + softAvail, (softAvail == 1.0));
-      allocateHold(0.5 * initialHeapSize);
+      allocateUntilOOM();
       softAvail = checkReferenceArray(sra, srq);
       check("Fraction of soft references after  GC still live = " + softAvail,
             (softAvail >= 0.00) && (softAvail <= 0.67),


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