1 //===-- Unittests for Atomic ----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "src/__support/CPP/atomic.h"
10 #include "utils/UnitTest/Test.h"
11
12 // Tests in this file do not test atomicity as it would require using
13 // threads, at which point it becomes a chicken and egg problem.
14
TEST(LlvmLibcAtomicTest,LoadStore)15 TEST(LlvmLibcAtomicTest, LoadStore) {
16 __llvm_libc::cpp::Atomic<int> aint(123);
17 ASSERT_EQ(aint.load(), 123);
18
19 aint.store(100);
20 ASSERT_EQ(aint.load(), 100);
21
22 aint = 1234; // Equivalent of store
23 ASSERT_EQ(aint.load(), 1234);
24 }
25
TEST(LlvmLibcAtomicTest,CompareExchangeStrong)26 TEST(LlvmLibcAtomicTest, CompareExchangeStrong) {
27 int desired = 123;
28 __llvm_libc::cpp::Atomic<int> aint(desired);
29 ASSERT_TRUE(aint.compare_exchange_strong(desired, 100));
30 ASSERT_EQ(aint.load(), 100);
31
32 ASSERT_FALSE(aint.compare_exchange_strong(desired, 100));
33 ASSERT_EQ(aint.load(), 100);
34 }
35