GuardedVariable.hpp

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#ifndef GuardedVariable_HPP
#define GuardedVariable_HPP

#include <iostream>

using namespace std;

#include <pthread.h>

  template<typename T>
  class GuardedVariable{

    private:

      volatile T variable; 
      pthread_mutex_t lock;
    public:

      GuardedVariable(T initialValue=0)
                   :variable(initialValue){

        pthread_mutex_init(&lock, NULL);

      }

      T inc(){

        T tmp;
        pthread_mutex_lock(&lock);
        tmp = variable++;
        pthread_mutex_unlock(&lock);
        return tmp;

      }
      
      T dec(){

        T tmp;
        pthread_mutex_lock(&lock);
        tmp = variable--;
        pthread_mutex_unlock(&lock);
        return tmp;

      }

      T value(){

        T tmp;
        pthread_mutex_lock(&lock);
        tmp = variable;
        pthread_mutex_unlock(&lock);
        return tmp;

      }
      
      void set(T newValue){
         pthread_mutex_lock(&lock);
          variable = newValue;
        pthread_mutex_unlock(&lock);
      }


      void reset(){
        set(0);
      }



  };


#endif//GuardedVariable_HPP

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