chore: import upstream snapshot with attribution

2026-07-13 13:29:29 +08:00
commit f52cf32e56
1718 changed files with 366293 additions and 0 deletions
@@ -0,0 +1,52 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <gtest/gtest.h>
+#include "butil/time.h"
+#include "butil/macros.h"
+
+namespace {
+
+class CachelineTest : public testing::Test {
+};
+
+struct BAIDU_CACHELINE_ALIGNMENT Bar {
+    int y;
+};
+
+struct Foo {
+    char dummy1[0];
+    int z;
+    BAIDU_CACHELINE_ALIGNMENT int x[0];
+    int y;
+    int m;
+    Bar bar;
+};
+
+TEST_F(CachelineTest, cacheline_alignment) {
+    ASSERT_EQ(64u, offsetof(Foo, x));
+    ASSERT_EQ(64u, offsetof(Foo, y));
+    ASSERT_EQ(68u, offsetof(Foo, m));
+    ASSERT_EQ(128u, offsetof(Foo, bar));
+    ASSERT_EQ(64u, sizeof(Bar));
+    ASSERT_EQ(192u, sizeof(Foo));
+}
+
+}