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A Tour of C++ for experienced programmers, as if C++26 is the only version that ever existed.
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12345678910111213141516171819202122232425262728293031323334353637383940#include <atomic>#include <thread>#include <vector>#include <iostream>
// Simple spinlock built from std::atomic_flag.struct spinlock { std::atomic_flag flag = ATOMIC_FLAG_INIT; void lock() { while (flag.test_and_set(std::memory_order_acquire)) { // busy‑wait } } void unlock() { flag.clear(std::memory_order_release); }};
constexpr int increments = 100'000;spinlock mtx;int protected_value = 0;
void worker() { for (int i = 0; i < increments; ++i) { mtx.lock(); ++protected_value; mtx.unlock(); }}
int main() { std::thread t1(worker); std::thread t2(worker); t1.join(); t2.join(); std::cout << "protected value = " << protected_value << "\n"; // EXPECT: protected value = 200000 return 0;}