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 
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 
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