g++ -g -O0 -pthread your_threaded_program.cpp -o your_program

valgrind --tool=helgrind ./your_program

#include <thread>
#include <iostream>
<p>int data = 0;</p>
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                <p>void increment() {
for (int i = 0; i < 100000; ++i) {
data++;  // 数据竞争！未加锁
}
}</p><p>int main() {
std::thread t1(increment);
std::thread t2(increment);
t1.join();
t2.join();
std::cout << "Final data: " << data << std::endl;
return 0;
}</p>

#include <thread>
#include <iostream>
#include <mutex>
<p>int data = 0;
std::mutex mtx;</p><p>void increment() {
for (int i = 0; i < 100000; ++i) {
std::lock_guard<std::mutex> lock(mtx);
data++;
}
}</p>