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- /* Copyright (c) 2015, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #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
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