Singleton class for mutex in c++

Question

I am struggling to get this working but it seems there is something I don't fully understand. I have a multi-threaded application in a single file (2 classes and the real main in which I create threads and everything). I want to split in 3 files. One for each class (with their headers) and one for main. I have a couple of mutices and a queue to share messages between threads and lock and unlock them at any time. I want to write a singleton class so all of them can share the mutex: header: ``` #ifndef COMMONSINGLETON_H #define COMMONSINGLETON_H #include // std::mutex #include class CommonSingleton{ private: static std::mutex mutex_w_b; //static std::mutex mutex_wifi_ok; //static std::queue queue_w_b; public: static CommonSingleton& getInstance(); std::mutex GetMutexWB(); //std::mutex GetMutexWiFiOk(); //std::queue GetQueueWB(); private: CommonSingleton() {}; CommonSingleton(CommonSingleton const&); void operator=(CommonSingleton const&); }; #…

Accepted Answer

You don't need so much boilerplate. You just need a function:

```
std::mutex& getCommonMutex() {
    static std::mutex m;
    return m;
}
```

That's all, you can call this function from anywhere and it will always return a reference to the same mutex, which will be initialized the first time its called.

Singleton class for mutex in c++

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