#pragma once
#include <atomic>
#include <cstdint>
namespace kcp {
    class Spinlock {
        std::atomic_flag f{ATOMIC_FLAG_INIT};
    public:
        void Acquire() { while (f.test_and_set(std::memory_order_acquire)) {} }
        void Release() { f.clear(std::memory_order_release); }
    };
    // The kernel's Mutex is the non-interrupt-disabling variant; on the host
    // there is nothing to disable, so the two are the same here.
    class Mutex {
        std::atomic_flag f{ATOMIC_FLAG_INIT};
    public:
        void Acquire() { while (f.test_and_set(std::memory_order_acquire)) {} }
        void Release() { f.clear(std::memory_order_release); }
    };
}