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An example on how to protect callbacks with mutextes. You can use POSIX mutexes, then you have to change enter()/exit() by pthread_mutex_lock()/_unlock(). Please see that

myNode::myCallback(const my_msgs::m1::ConstPtr& msg)
{
   mutex.enter();
   this->a = msg->a;
   mutex.exit();
}
myNode::myCallback(const my_msgs::m2::ConstPtr& msg)
{
   mutex.enter();
   this->b = msg->b;
   mutex.exit();
}
myNode::process()
{
   mutex.enter();
   std::cout << this->a + this->b << std::endl;
   mutex.exit();
}