| // Copyright 2015 The BoringSSL Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "internal.h" |
| |
| #include <gtest/gtest.h> |
| |
| #if defined(OPENSSL_THREADS) |
| #include <thread> |
| #endif |
| |
| |
| TEST(RefCountTest, Basic) { |
| CRYPTO_refcount_t count = 0; |
| |
| CRYPTO_refcount_inc(&count); |
| EXPECT_EQ(1u, count); |
| |
| EXPECT_TRUE(CRYPTO_refcount_dec_and_test_zero(&count)); |
| EXPECT_EQ(0u, count); |
| |
| count = CRYPTO_REFCOUNT_MAX; |
| CRYPTO_refcount_inc(&count); |
| EXPECT_EQ(CRYPTO_REFCOUNT_MAX, count) |
| << "Count did not saturate correctly when incrementing."; |
| EXPECT_FALSE(CRYPTO_refcount_dec_and_test_zero(&count)); |
| EXPECT_EQ(CRYPTO_REFCOUNT_MAX, count) |
| << "Count did not saturate correctly when decrementing."; |
| |
| count = 2; |
| EXPECT_FALSE(CRYPTO_refcount_dec_and_test_zero(&count)); |
| EXPECT_EQ(1u, count); |
| } |
| |
| #if defined(OPENSSL_THREADS) |
| // This test is primarily intended to run under ThreadSanitizer. |
| TEST(RefCountTest, Threads) { |
| CRYPTO_refcount_t count = 0; |
| |
| // Race two increments. |
| { |
| std::thread thread([&] { CRYPTO_refcount_inc(&count); }); |
| CRYPTO_refcount_inc(&count); |
| thread.join(); |
| EXPECT_EQ(2u, count); |
| } |
| |
| // Race an increment with a decrement. |
| { |
| std::thread thread([&] { CRYPTO_refcount_inc(&count); }); |
| EXPECT_FALSE(CRYPTO_refcount_dec_and_test_zero(&count)); |
| thread.join(); |
| EXPECT_EQ(2u, count); |
| } |
| |
| // Race two decrements. |
| { |
| bool thread_saw_zero; |
| std::thread thread( |
| [&] { thread_saw_zero = CRYPTO_refcount_dec_and_test_zero(&count); }); |
| bool saw_zero = CRYPTO_refcount_dec_and_test_zero(&count); |
| thread.join(); |
| EXPECT_EQ(0u, count); |
| // Exactly one thread should see zero. |
| EXPECT_NE(saw_zero, thread_saw_zero); |
| } |
| } |
| #endif |