After execution Call back function program doesnt return to orignal execution?

edit

Suppose I have following program :

Global Variables
void  main (..)
{
  declared nodes.. and stuff

  while(1)
  {
      do X stuff.. 

      publish a topic..
  }
} 

void callback()
{
    process data.. 
}

I am not able to publish a topic, after first call back is called.. Is it some error in my code or, I am missing some return statement.. ?

Actually am using Odometry Sample Program and have linked it with roserial program. So the only modification to sample odometry program I have made is that have added a subscriber and a callback method which sets vx vy etc variables... The problem is the odom and base_link frames no longer exists.. ? I dont know whats wrong :(