| 170 | } |
| 171 | |
| 172 | void SC::AtomicTest::testAtomicMultiThreaded() |
| 173 | { |
| 174 | // Test fetch_add |
| 175 | { |
| 176 | Atomic<int32_t> counter(0); |
| 177 | Thread threads[4]; |
| 178 | for (auto& thread : threads) |
| 179 | { |
| 180 | SC_TEST_EXPECT(thread.start( |
| 181 | [&](Thread&) |
| 182 | { |
| 183 | for (int k = 0; k < 1000; ++k) |
| 184 | { |
| 185 | counter.fetch_add(1, memory_order_relaxed); |
| 186 | } |
| 187 | })); |
| 188 | } |
| 189 | for (auto& thread : threads) |
| 190 | { |
| 191 | SC_TEST_EXPECT(thread.join()); |
| 192 | } |
| 193 | SC_TEST_EXPECT(counter.load() == 4000); |
| 194 | } |
| 195 | |
| 196 | // Test compare_exchange_strong |
| 197 | { |
| 198 | Atomic<int32_t> value(0); |
| 199 | Atomic<int32_t> successes(0); |
| 200 | Thread threads[4]; |
| 201 | for (auto& thread : threads) |
| 202 | { |
| 203 | SC_TEST_EXPECT(thread.start( |
| 204 | [&](Thread&) |
| 205 | { |
| 206 | int32_t expected = 0; |
| 207 | if (value.compare_exchange_strong(expected, 1)) |
| 208 | { |
| 209 | successes.fetch_add(1); |
| 210 | } |
| 211 | })); |
| 212 | } |
| 213 | for (auto& thread : threads) |
| 214 | { |
| 215 | SC_TEST_EXPECT(thread.join()); |
| 216 | } |
| 217 | SC_TEST_EXPECT(value.load() == 1); |
| 218 | SC_TEST_EXPECT(successes.load() == 1); |
| 219 | } |
| 220 | |
| 221 | // Test store(release) / load(acquire) ordering |
| 222 | { |
| 223 | struct Context |
| 224 | { |
| 225 | Atomic<bool> flag = false; |
| 226 | int data = 0; |
| 227 | } ctx; |
| 228 | Thread producer; |
| 229 | SC_TEST_EXPECT(producer.start( |