1 files changed, 86 insertions, 0 deletions
diff --git a/test/096-array-copy-concurrent-gc/src/Main.java b/test/096-array-copy-concurrent-gc/src/Main.java
new file mode 100644
index 0000000000..c8e538b5e3
--- /dev/null
+++ b/test/096-array-copy-concurrent-gc/src/Main.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Running concurrent gc and doing some System.arraycopy
+ * Several threads is created in order to increase the probability
+ * of thread switches at critical points. Without creating several
+ * threads the test case usually passed even when there were bugs.
+ * Size of array and amount of garbage created is based on experimental
+ * numbers and is a tradeoff between time that the test takes when
+ * it succeeds and the probability that the test discovers a problem.
+ */
+public class Main {
+    public static void main(String args[]) {
+        new ObjectCreatorThread(true).start();
+        new ObjectCreatorThread(false).start();
+        new ObjectCreatorThread(false).start();
+    }
+
+    static class ObjectCreatorThread extends Thread {
+        boolean mDoLog;
+        public ObjectCreatorThread(boolean doLog) {
+            mDoLog = doLog;
+        }
+
+        @Override
+        public void run() {
+            new Main().stressArray(mDoLog);
+        }
+    }
+
+    Object [] array = new Object[10000];
+
+    void stressArray(boolean doLog) {
+        // We want many references in the array
+        // We also want elements close to each other to have large
+        // diff in address so lets skip every 2:nd address so it is null
+        if (doLog) {
+            System.out.println("Initializing...");
+        }
+        for (int i = 0; i < array.length; i+=2) {
+            array[i] = new String("Creating some garbage" + i);
+        }
+
+        if (doLog) {
+            System.out.println("Starting the test");
+        }
+
+        for (int j = 0; j < array.length; j++) {
+            Object obj = array[array.length - 1];
+            System.arraycopy(array, 0, array, 1, array.length - 1);
+            array[0] = obj;
+            new String("Creating some garbage" + Math.random());
+            new String("Creating some garbage" + Math.random());
+            new String("Creating some garbage" + Math.random());
+            new String("Creating some garbage" + Math.random());
+        }
+
+        for (int j = 0; j < array.length; j++) {
+            Object obj = array[0];
+            System.arraycopy(array, 1, array, 0, array.length - 1);
+            array[array.length - 1] = obj;
+            new String("Creating some garbage" + Math.random());
+            new String("Creating some garbage" + Math.random());
+            new String("Creating some garbage" + Math.random());
+            new String("Creating some garbage" + Math.random());
+        }
+
+        if (doLog) {
+            System.out.println("Test OK");
+        }
+    }
+}