test/cacheline_unittest.cpp

// 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
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// 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));
}

}