1 files changed, 105 insertions, 0 deletions
diff --git a/src/mongo/platform/atomic_word_test.cpp b/src/mongo/platform/atomic_word_test.cpp
new file mode 100644
index 00000000000..ca56b27e69e
--- /dev/null
+++ b/src/mongo/platform/atomic_word_test.cpp
@@ -0,0 +1,105 @@
+/*    Copyright 2012 10gen Inc.
+ *
+ *    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.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include <iostream>
+
+#include <boost/static_assert.hpp>
+
+#include "mongo/platform/atomic_word.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+    namespace {
+
+        template <typename _AtomicWordType>
+        void testAtomicWordBasicOperations() {
+            typedef typename _AtomicWordType::WordType WordType;
+            _AtomicWordType w;
+
+            ASSERT_EQUALS(WordType(0), w.load());
+
+            w.store(1);
+            ASSERT_EQUALS(WordType(1), w.load());
+
+            ASSERT_EQUALS(WordType(1), w.swap(2));
+            ASSERT_EQUALS(WordType(2), w.load());
+
+            ASSERT_EQUALS(WordType(2), w.compareAndSwap(0, 1));
+            ASSERT_EQUALS(WordType(2), w.load());
+            ASSERT_EQUALS(WordType(2), w.compareAndSwap(2, 1));
+            ASSERT_EQUALS(WordType(1), w.load());
+
+            ASSERT_EQUALS(WordType(1), w.fetchAndAdd(14));
+            ASSERT_EQUALS(WordType(17), w.addAndFetch(2));
+            ASSERT_EQUALS(WordType(16), w.subtractAndFetch(1));
+            ASSERT_EQUALS(WordType(16), w.fetchAndSubtract(1));
+            ASSERT_EQUALS(WordType(15), w.compareAndSwap(15, 0));
+            ASSERT_EQUALS(WordType(0), w.load());
+        }
+
+        TEST(AtomicWordTests, BasicOperationsUnsigned32Bit) {
+            typedef AtomicUInt32::WordType WordType;
+            testAtomicWordBasicOperations<AtomicUInt32>();
+
+            AtomicUInt32 w(0xdeadbeef);
+            ASSERT_EQUALS(WordType(0xdeadbeef), w.compareAndSwap(0, 1));
+            ASSERT_EQUALS(WordType(0xdeadbeef), w.compareAndSwap(0xdeadbeef, 0xcafe1234));
+            ASSERT_EQUALS(WordType(0xcafe1234), w.fetchAndAdd(0xf000));
+            ASSERT_EQUALS(WordType(0xcaff0234), w.swap(0));
+            ASSERT_EQUALS(WordType(0), w.load());
+        }
+
+        TEST(AtomicWordTests, BasicOperationsUnsigned64Bit) {
+            typedef AtomicUInt64::WordType WordType;
+            testAtomicWordBasicOperations<AtomicUInt64>();
+
+            AtomicUInt64 w(0xdeadbeefcafe1234ULL);
+            ASSERT_EQUALS(WordType(0xdeadbeefcafe1234ULL), w.compareAndSwap(0, 1));
+            ASSERT_EQUALS(WordType(0xdeadbeefcafe1234ULL),
+                          w.compareAndSwap(0xdeadbeefcafe1234ULL, 0xfedcba9876543210ULL));
+            ASSERT_EQUALS(WordType(0xfedcba9876543210ULL), w.fetchAndAdd(0xf0000000ULL));
+            ASSERT_EQUALS(WordType(0xfedcba9966543210ULL), w.swap(0));
+            ASSERT_EQUALS(WordType(0), w.load());
+        }
+
+        TEST(AtomicWordTests, BasicOperationsSigned32Bit) {
+            typedef AtomicInt32::WordType WordType;
+            testAtomicWordBasicOperations<AtomicInt32>();
+
+            AtomicInt32 w(0xdeadbeef);
+            ASSERT_EQUALS(WordType(0xdeadbeef), w.compareAndSwap(0, 1));
+            ASSERT_EQUALS(WordType(0xdeadbeef), w.compareAndSwap(0xdeadbeef, 0xcafe1234));
+            ASSERT_EQUALS(WordType(0xcafe1234), w.fetchAndAdd(0xf000));
+            ASSERT_EQUALS(WordType(0xcaff0234), w.swap(0));
+            ASSERT_EQUALS(WordType(0), w.load());
+        }
+
+        TEST(AtomicWordTests, BasicOperationsSigned64Bit) {
+            typedef AtomicInt64::WordType WordType;
+            testAtomicWordBasicOperations<AtomicInt64>();
+
+            AtomicInt64 w(0xdeadbeefcafe1234ULL);
+            ASSERT_EQUALS(WordType(0xdeadbeefcafe1234LL), w.compareAndSwap(0, 1));
+            ASSERT_EQUALS(WordType(0xdeadbeefcafe1234LL),
+                          w.compareAndSwap(0xdeadbeefcafe1234LL, 0xfedcba9876543210LL));
+            ASSERT_EQUALS(WordType(0xfedcba9876543210LL), w.fetchAndAdd(0xf0000000LL));
+            ASSERT_EQUALS(WordType(0xfedcba9966543210LL), w.swap(0));
+            ASSERT_EQUALS(WordType(0), w.load());
+        }
+
+    }  // namespace
+}  // namespace mongo