//---------------------------------------------------------
// spinlock.h: stallings + interruptor(con spinlock)
//---------------------------------------------------------

#include <atomic>
#include <mutex>

//---------------------------------------------------------

class interruptor
{
public:
    void lock(std::mutex &llave)
    {
        while (spinlock.test() || spinlock.test_and_set());
        if (++contador == 1)
            llave.lock();
        spinlock.clear();
    }

    void unlock(std::mutex &llave)
    {
        while (spinlock.test() || spinlock.test_and_set());
        if (--contador == 0)
            llave.unlock();
        spinlock.clear();
    }

protected:
    std::atomic_flag spinlock;
    size_t contador = 0;
};

//---------------------------------------------------------