利用CAS实现自旋锁
class spin_mutex {
private:
std::atomic<bool> flag = ATOMIC_VAR_INIT(false);
public:
spin_mutex() = default;
spin_mutex(const spin_mutex&) = delete;
spin_mutex& operator= (const spin_mutex&) = delete;
void lock() {
bool expected = false;
while(!flag.compare_exchange_strong(expected, true))
expected = false;
}
void unlock() {
flag.store(false);
}
};引用