17 changes: 17 additions & 0 deletions libc/test/src/__support/CPP/atomic_test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -32,3 +32,20 @@ TEST(LlvmLibcAtomicTest, CompareExchangeStrong) {
ASSERT_FALSE(aint.compare_exchange_strong(desired, 100));
ASSERT_EQ(aint.load(LIBC_NAMESPACE::cpp::MemoryOrder::RELAXED), 100);
}

struct TrivialData {
int a;
int b;
};

TEST(LlvmLibcAtomicTest, TrivialCompositeData) {
LIBC_NAMESPACE::cpp::Atomic<TrivialData> data({1, 2});
ASSERT_EQ(data.load(LIBC_NAMESPACE::cpp::MemoryOrder::RELAXED).a, 1);
ASSERT_EQ(data.load(LIBC_NAMESPACE::cpp::MemoryOrder::RELAXED).b, 2);

auto old = data.exchange({3, 4});
ASSERT_EQ(data.load(LIBC_NAMESPACE::cpp::MemoryOrder::RELAXED).a, 3);
ASSERT_EQ(data.load(LIBC_NAMESPACE::cpp::MemoryOrder::RELAXED).b, 4);
ASSERT_EQ(old.a, 1);
ASSERT_EQ(old.b, 2);
}