此实例通过c++11实现。

#pragma once

#include 
#include 

class Spinlock {
public:
    Spinlock() : flag(ATOMIC_FLAG_INIT), wait_count(2000) {}

    void lock() {
        int64_t i = 0;
        while(flag.test_and_set(std::memory_order_acquire)) {
            __asm__ ("pause");
            if (++i > wait_count) {
                sched_yield();
                i = 0;
            }
        }
    }

    bool try_lock() {
        if (flag.test_and_set(std::memory_order_acquire)) {
            return false;
        }
        return true;
    }

    void unlock() {
        flag.clear(std::memory_order_release);
    }

private :
    std::atomic_flag flag;
    int32_t wait_count;
};