8129457: Disposer.pollRemove may fail to dispose

Reviewed-by: prr, serb

jdk/src/java.desktop/share/classes/sun/java2d/Disposer.java

@@ -205,8 +205,8 @@ public class Disposer implements Runnable {
         int freed = 0;
         int deferred = 0;
         try {
-            while ((obj = queue.poll()) != null
-                   && freed < 10000 && deferred < 100) {
+            while ( freed < 10000 && deferred < 100 &&
+                    (obj = queue.poll()) != null ) {
                 freed++;
                 ((Reference)obj).clear();
                 DisposerRecord rec = records.remove(obj);

jdk/test/sun/java2d/Disposer/TestDisposerLeak.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.util.LinkedList;
+import java.util.List;
+
+import sun.java2d.Disposer;
+import sun.java2d.DisposerRecord;
+
+/**
+ * @test
+ * @bug 8129457
+ * @summary Check Disposer disposes all objects without any memory leaks
+ * @run main/othervm TestDisposerLeak
+ * @modules java.desktop/sun.java2d
+ */
+public final class TestDisposerLeak {
+
+    private static final int COUNT = 30000;
+
+    private static volatile boolean disposerComplete;
+
+    private static volatile boolean readyForDispose;
+
+    static int disposeCount = 0;
+
+    public static void main(String[] args) throws Exception {
+        TestDisposerLeak test = new TestDisposerLeak();
+        test.testLeak();
+        while (!disposerComplete) {}
+        if (disposeCount != COUNT) {
+            System.err.println("dispose called " + disposeCount);
+            throw new RuntimeException("All objects are not disposed");
+        }else {
+            System.out.println("Test PASSED");
+        }
+    }
+
+    public void testLeak() throws Exception {
+        MyDisposerRec disposerRecord = new MyDisposerRec();
+        for (int i = 0; i < 30000; i++) {
+            Disposer.addObjectRecord(new Object(), disposerRecord);
+        }
+        generateOOME();
+        readyForDispose = true;
+        Disposer.addObjectRecord(new Object(), new EndRec());
+        generateOOME();
+    }
+
+    class MyDisposerRec implements DisposerRecord, Disposer.PollDisposable {
+
+        public void dispose() {
+            while (!readyForDispose) {}
+            disposeCount++;
+            Disposer.pollRemove();
+        }
+    }
+
+    class EndRec implements DisposerRecord, Disposer.PollDisposable {
+
+        public void dispose() {
+            disposerComplete = true;
+        }
+    }
+
+    private static void generateOOME() throws Exception {
+        List<Object> leak = new LinkedList<>();
+        try {
+            while (true) {
+                leak.add(new byte[1024 * 1024]);
+            }
+        } catch (OutOfMemoryError e) {
+        }
+        // Give the GC a chance at that weakref in case of slow systems
+        Thread.sleep(2000);
+    }
+}