Mutex.cpp

#include	<iostream>

using namespace std;

class Mutex{
	public:
		typedef volatile unsigned int id_t;
	private:
		id_t id_global;
		id_t base;

		inline void block( const id_t &id ){
			while( id!=base );
		}

	public:
		Mutex() : id_global(0), base(1)
		{ }

		void lock(){
			const id_t id=++id_global;
			block(id);
		}
		void release(){
			++base;
		}
};

class Critical{
	private:
		Mutex &mutex;
	public:
		Critical( Mutex &mutex ) : mutex(mutex) {
			mutex.lock();
		}
		~Critical(){
			mutex.release();
		}
};

int main(){
	Mutex x;
	{
		Critical rc(x);
		cout << "Printf!!!!\n" ;
	}
	return 0;
}