rtmidi/Clock.h

#pragma once
#include <mutex>
#include <atomic>
#include <thread>
#include <chrono>

namespace midi {

class Clock
{
    typedef std::chrono::high_resolution_clock clock;
    typedef clock::time_point time_point;
    typedef clock::duration duration;

public:
    typedef unsigned int bpm_type;

private:    
    bpm_type bpm;
    std::mutex bpm_mutex;
    time_point lastTickTime;
    std::thread tickThread;
    std::atomic<bool> stopTickThread;
    bool running;
    std::mutex running_mutex;

public:
    Clock();
    bpm_type getBpm();
    void setBpm(bpm_type bpm);
    duration getTickInterval();
    void start();
    void stop();
    bool isRunning();
    static inline time_point now()
    {
        return clock::now();
    }

protected:
    virtual void tick();

private: 
    void run();
    void setRunning(bool running);
};

} // namespace