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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2025-09-19 Rbb666 the first version
*/
#include <rtthread.h>
#include "utest.h"
#include <thread>
#include <atomic>
#include <cstdint>
/**
* @brief Test load and store operations for int32_t atomic variables in multi-threaded environment.
* Verifies atomicity by performing increment and decrement operations concurrently.
*/
static void test_atomic_load_store_int32(void)
{
constexpr int kRound = 10000000;
std::atomic<int32_t> thread_count(0);
std::atomic<int32_t> count(100);
uassert_int_equal(count.load(), 100);
auto func1 = [&]() mutable {
for (int i = 0; i < kRound; ++i)
{
++count;
}
++thread_count;
};
auto func2 = [&]() mutable {
for (int i = 0; i < kRound; ++i)
{
--count;
}
++thread_count;
};
std::thread t1(func1);
std::thread t2(func2);
t1.join();
t2.join();
uassert_int_equal(count.load(), 100);
uassert_int_equal(thread_count.load(), 2);
}
/**
* @brief Test load and store operations for int64_t atomic variables in multi-threaded environment.
* Verifies atomicity by performing increment and decrement operations concurrently.
*/
static void test_atomic_load_store_int64(void)
{
constexpr int kRound = 10000000;
std::atomic<int64_t> thread_count(0);
std::atomic<int64_t> count(100);
uassert_int_equal(count.load(), 100);
auto func1 = [&]() mutable {
for (int i = 0; i < kRound; ++i)
{
++count;
}
++thread_count;
};
auto func2 = [&]() mutable {
for (int i = 0; i < kRound; ++i)
{
--count;
}
++thread_count;
};
std::thread t1(func1);
std::thread t2(func2);
t1.join();
t2.join();
uassert_int_equal(count.load(), 100);
uassert_int_equal(thread_count.load(), 2);
}
/**
* @brief Test basic atomic operations for int32_t, including load, store, fetch_add, fetch_sub,
* fetch_and, fetch_or, fetch_xor, exchange, and compare_exchange_strong.
*/
static void test_atomic_basic_int32(void)
{
std::atomic<int32_t> val;
val = 10;
uassert_int_equal(val.load(), 10);
val++;
uassert_int_equal(val.load(), 11);
val--;
uassert_int_equal(val.load(), 10);
auto a = val.load();
val.store(a);
val.fetch_add(1);
uassert_int_equal(val.load(), 11);
val.fetch_sub(1);
uassert_int_equal(val.load(), 10);
val.fetch_and(14);
uassert_int_equal(val.load(), 10);
val.fetch_or(11); /* 1010 */
uassert_int_equal(val.load(), 11);
val.fetch_xor(4);
uassert_int_equal(val.load(), 15);
val.exchange(1);
uassert_int_equal(val.load(), 1);
int32_t x = 2;
int32_t y = 3;
bool exchanged = val.compare_exchange_strong(x, y);
uassert_false(exchanged);
uassert_int_equal(val.load(), 1);
uassert_int_equal(x, 1);
exchanged = val.compare_exchange_strong(x, y);
uassert_true(exchanged);
uassert_int_equal(val.load(), 3);
uassert_int_equal(x, 1);
}
/**
* @brief Test basic atomic operations for int64_t, including load, store, fetch_add, fetch_sub,
* fetch_and, fetch_or, fetch_xor, exchange, and compare_exchange_strong.
*/
static void test_atomic_basic_int64(void)
{
std::atomic<int64_t> val;
val = 10;
uassert_int_equal(val.load(), 10);
val++;
uassert_int_equal(val.load(), 11);
val--;
uassert_int_equal(val.load(), 10);
auto a = val.load();
val.store(a);
val.fetch_add(1);
uassert_int_equal(val.load(), 11);
val.fetch_sub(1);
uassert_int_equal(val.load(), 10);
val.fetch_and(14);
uassert_int_equal(val.load(), 10);
val.fetch_or(11); /* 1010 */
uassert_int_equal(val.load(), 11);
val.fetch_xor(4);
uassert_int_equal(val.load(), 15);
val.exchange(1);
uassert_int_equal(val.load(), 1);
int64_t x = 2;
int64_t y = 3;
bool exchanged = val.compare_exchange_strong(x, y);
uassert_false(exchanged);
uassert_int_equal(val.load(), 1);
uassert_int_equal(x, 1);
exchanged = val.compare_exchange_strong(x, y);
uassert_true(exchanged);
uassert_int_equal(val.load(), 3);
uassert_int_equal(x, 1);
}
/**
* @brief Test atomic operations for bool type, including store, load, exchange, and compare_exchange_strong.
*/
static void test_atomic_bool(void)
{
std::atomic<bool> flag(false);
flag.store(true);
uassert_true(flag.load());
flag.exchange(false);
uassert_false(flag.load());
bool expected = false;
bool desired = true;
uassert_true(flag.compare_exchange_strong(expected, desired));
uassert_true(flag.load());
}
/**
* @brief Test atomic operations for pointer type (int*), including store, load, and exchange.
*/
static void test_atomic_pointer(void)
{
int a = 1, b = 2;
std::atomic<int *> ptr(&a);
ptr.store(&b);
uassert_int_equal(*ptr.load(), 2);
int *old = ptr.exchange(&a);
uassert_ptr_equal(old, &b);
uassert_int_equal(*ptr.load(), 1);
}
/**
* @brief Test memory ordering constraints using memory_order_release and memory_order_acquire.
*/
static void test_memory_order(void)
{
std::atomic<int> x(0);
std::atomic<int> y(0);
/* Simple test for memory order */
x.store(1, std::memory_order_release);
y.store(2, std::memory_order_release);
uassert_int_equal(x.load(std::memory_order_acquire), 1);
uassert_int_equal(y.load(std::memory_order_acquire), 2);
}
/**
* @brief Test compare_exchange_weak operation, which may fail spuriously and requires looping.
*/
static void test_compare_exchange_weak(void)
{
std::atomic<int> val(1);
int expected = 1;
int desired = 2;
while (!val.compare_exchange_weak(expected, desired))
{
/* Reset */
expected = 1;
}
uassert_int_equal(val.load(), 2);
}
/**
* @brief Test case initialization function.
* @return RT_EOK on success.
*/
static rt_err_t utest_tc_init(void)
{
return RT_EOK;
}
/**
* @brief Test case cleanup function.
* @return RT_EOK on success.
*/
static rt_err_t utest_tc_cleanup(void)
{
return RT_EOK;
}
/**
* @brief Main test case function that runs the test.
*/
static void testcase(void)
{
/* Test load and store operations for int32_t atomic variables in multi-threaded environment */
UTEST_UNIT_RUN(test_atomic_load_store_int32);
/* Test load and store operations for int64_t atomic variables in multi-threaded environment */
UTEST_UNIT_RUN(test_atomic_load_store_int64);
/* Test basic atomic operations for int32_t */
UTEST_UNIT_RUN(test_atomic_basic_int32);
/* Test basic atomic operations for int64_t */
UTEST_UNIT_RUN(test_atomic_basic_int64);
/* Test atomic operations for bool type */
UTEST_UNIT_RUN(test_atomic_bool);
/* Test atomic operations for pointer type */
UTEST_UNIT_RUN(test_atomic_pointer);
/* Test memory ordering constraints */
UTEST_UNIT_RUN(test_memory_order);
/* Test compare_exchange_weak operation */
UTEST_UNIT_RUN(test_compare_exchange_weak);
}
/* Export the test case with initialization and cleanup functions and a timeout of 10 ticks. */
UTEST_TC_EXPORT(testcase, "components.libc.cpp.atomic_tc", utest_tc_init, utest_tc_cleanup, 10);
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