changeset 218:5fcd4f948639

Various samples.
author shade
date Tue, 10 Mar 2015 14:39:51 +0300
parents 116fcb6098b7
children 2c43cdee5309
files tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/BitSetTest.java tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/UnsafeAtomicityTest.java tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/UnsafeConstructionTest.java tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/UnsafePublicationTest.java
diffstat 4 files changed, 280 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/BitSetTest.java	Tue Mar 10 14:39:51 2015 +0300
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2014, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.jcstress.tests.vjug;
+
+import org.openjdk.jcstress.annotations.Actor;
+import org.openjdk.jcstress.annotations.Arbiter;
+import org.openjdk.jcstress.annotations.Description;
+import org.openjdk.jcstress.annotations.Expect;
+import org.openjdk.jcstress.annotations.JCStressTest;
+import org.openjdk.jcstress.annotations.Outcome;
+import org.openjdk.jcstress.annotations.State;
+import org.openjdk.jcstress.infra.results.BooleanResult2;
+
+import java.util.BitSet;
+
+@JCStressTest
+@Description("Tests if racy update to BitSet experiences word tearing.")
+@Outcome(id = "[true, false]", expect = Expect.ACCEPTABLE_INTERESTING, desc = "Thread 1 has intervened, word tearing occurred.")
+@Outcome(id = "[false, true]", expect = Expect.ACCEPTABLE_INTERESTING, desc = "Thread 2 has intervened, word tearing occurred.")
+@Outcome(id = "[true, true]",  expect = Expect.ACCEPTABLE_INTERESTING, desc = "Observed both thread writes.")
+@State
+public class BitSetTest {
+
+    final BitSet o = new BitSet();
+
+    @Actor
+    public void thread1() {
+        o.set(0);
+    }
+
+    @Actor
+    public void thread2() {
+        o.set(1);
+    }
+
+    @Arbiter
+    public void observe(BooleanResult2 res) {
+        res.r1 = o.get(0);
+        res.r2 = o.get(1);
+    }
+
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/UnsafeAtomicityTest.java	Tue Mar 10 14:39:51 2015 +0300
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2005, 2013, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.jcstress.tests.vjug;
+
+import org.openjdk.jcstress.annotations.Actor;
+import org.openjdk.jcstress.annotations.Description;
+import org.openjdk.jcstress.annotations.Expect;
+import org.openjdk.jcstress.annotations.JCStressTest;
+import org.openjdk.jcstress.annotations.Outcome;
+import org.openjdk.jcstress.annotations.State;
+import org.openjdk.jcstress.infra.results.IntResult1;
+import org.openjdk.jcstress.util.UnsafeHolder;
+
+@JCStressTest
+@Description("Tests if Unsafe breaks the atomicity while doing cross cache-line reads/writes.")
+@Outcome(id = "[0]",  expect = Expect.ACCEPTABLE,             desc = "Seeing the default value, this is a legal race.")
+@Outcome(id = "[-1]", expect = Expect.ACCEPTABLE,             desc = "Seeing the full value, this is a legal behavior.")
+@Outcome(             expect = Expect.ACCEPTABLE_INTERESTING, desc = "Other cases exhibit the breach of read/write atomicity.")
+@State
+public class UnsafeAtomicityTest {
+
+    public final long addr;
+    public final long offset;
+
+    public UnsafeAtomicityTest() {
+        final int size = 1024;
+        addr = UnsafeHolder.U.allocateMemory(size);
+        UnsafeHolder.U.setMemory(addr, size, (byte)0);
+        offset = ((addr + 512) & ~255) - 2;
+    }
+
+    @Actor
+    public void actor1() {
+        UnsafeHolder.U.putInt(null, offset, 0xFFFFFFFF);
+    }
+
+    @Actor
+    public void actor2(IntResult1 r) {
+        r.r1 = UnsafeHolder.U.getInt(null, offset);
+    }
+
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/UnsafeConstructionTest.java	Tue Mar 10 14:39:51 2015 +0300
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2014, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.jcstress.tests.vjug;
+
+import org.openjdk.jcstress.annotations.Actor;
+import org.openjdk.jcstress.annotations.Description;
+import org.openjdk.jcstress.annotations.Expect;
+import org.openjdk.jcstress.annotations.JCStressTest;
+import org.openjdk.jcstress.annotations.Outcome;
+import org.openjdk.jcstress.annotations.State;
+import org.openjdk.jcstress.infra.results.IntResult1;
+
+@JCStressTest
+@Description("Tests if unsafe publication is unsafe.")
+@Outcome(id = "[-1]", expect = Expect.ACCEPTABLE,             desc = "The object is not yet published")
+@Outcome(id = "[0]",  expect = Expect.ACCEPTABLE_INTERESTING, desc = "The object is published, but all fields are 0.")
+@Outcome(id = "[1]",  expect = Expect.ACCEPTABLE_INTERESTING, desc = "The object is published, 1 field is visible.")
+@Outcome(id = "[2]",  expect = Expect.ACCEPTABLE_INTERESTING, desc = "The object is published, 2 fields are visible.")
+@Outcome(id = "[3]",  expect = Expect.ACCEPTABLE_INTERESTING, desc = "The object is published, 3 fields are visible.")
+@Outcome(id = "[4]",  expect = Expect.ACCEPTABLE,             desc = "The object is published, all fields are visible.")
+@State
+public class UnsafeConstructionTest {
+
+    /*
+       Implementation notes:
+         * This showcases how compiler can move the publishing store past the field stores.
+         * We need to provide constructor with some external value. If we put the constants in the
+           constructor, then compiler can store all the fields with a single bulk store.
+         * This test is best to be run with either 32-bit VM, or 64-bit VM with -XX:-UseCompressedOops:
+           it seems the compressed references mechanics moves the reference store after the field
+           stores, even though not required by JMM.
+     */
+
+    int x = 1;
+
+    MyObject o;
+
+    @Actor
+    public void publish() {
+        o = new MyObject(x);
+    }
+
+    @Actor
+    public void consume(IntResult1 res) {
+        MyObject lo = o;
+        if (lo != null) {
+            res.r1 = lo.x00 + lo.x01 + lo.x02 + lo.x03;
+        } else {
+            res.r1 = -1;
+        }
+    }
+
+    static class MyObject {
+        int x00, x01, x02, x03;
+        public MyObject(int x) {
+            x00 = x;
+            x01 = x;
+            x02 = x;
+            x03 = x;
+        }
+    }
+
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests-custom/src/main/java/org/openjdk/jcstress/tests/vjug/UnsafePublicationTest.java	Tue Mar 10 14:39:51 2015 +0300
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2014, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package org.openjdk.jcstress.tests.vjug;
+
+import org.openjdk.jcstress.annotations.Actor;
+import org.openjdk.jcstress.annotations.Description;
+import org.openjdk.jcstress.annotations.Expect;
+import org.openjdk.jcstress.annotations.JCStressTest;
+import org.openjdk.jcstress.annotations.Outcome;
+import org.openjdk.jcstress.annotations.State;
+import org.openjdk.jcstress.infra.results.IntResult1;
+
+@JCStressTest
+@Description("Tests if unsafe publication is unsafe.")
+@Outcome(id = "[-1]", expect = Expect.ACCEPTABLE,             desc = "The object is not yet published")
+@Outcome(id = "[0]",  expect = Expect.ACCEPTABLE_INTERESTING, desc = "The object is published, but the fields has the default value.")
+@Outcome(id = "[1]",  expect = Expect.ACCEPTABLE,             desc = "The object is published, and all fields are visible.")
+@State
+public class UnsafePublicationTest {
+
+    final MyObject o = new MyObject();
+
+    MyObject po;
+
+    @Actor
+    public void publish() {
+        o.x = 1;
+        po = o;
+    }
+
+    @Actor
+    public void consume(IntResult1 res) {
+        MyObject lo = po;
+        if (lo != null) {
+            res.r1 = lo.x;
+        } else {
+            res.r1 = -1;
+        }
+    }
+
+    static class MyObject {
+        int x;
+    }
+
+}