simple_mutex.h

// A simple mutex implementation. It implements
// a active wait loop if the mutex is locked.
 
#ifndef _SIMPLE_MUTEX_H_
#define _SIMPLE_MUTEX_H_
 
#include "mutex_interface.h"
 
class simple_mutex : public mutex_interface {
public:
 
    simple_mutex() : _lock(false) { }
    virtual ~simple_mutex() { }
 
    void lock() override {
        while(_lock) ;
        _lock = true;
    }
 
    void unlock() override {
        _lock = false;
    }
 
    bool try_lock() override {
        if (!_lock) {
            _lock = true;
            return true;
        } else {
            return false;
        }
    }
 
private:
    bool _lock;
};
 
#endif // _SIMPLE_MUTEX_H_