1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include <gtest/gtest.h>
17
18 namespace android {
19
20 namespace {
21 using AtomicBufferStateTest = ::testing::Test;
22 } // namespace
23
24 // Part of the buffer synchronization mechanism is achieved by using atomic
25 // variables, e.g. buffer state, located in Android shared memory. This test is
26 // to makes sure that a variable of type std::atomic<uint32_t> is lock-free, and
27 // hopefully address-free, so that they would be suitable for communication
28 // between processes using shared memory.
TEST(AtomicBufferStateTest,AtomicsRequiresLockFree)29 TEST(AtomicBufferStateTest, AtomicsRequiresLockFree) {
30 std::atomic<uint32_t> fake_buffer_state(~0U);
31 EXPECT_TRUE(fake_buffer_state.is_lock_free());
32 }
33
34 } // namespace android
35