Thanks you for your reply.
Ok it's work but not quite. 

I create thread with function which change value(bytes) pgmData for 1 second. 
pgmData value = 1000
next                  = 0100
next                  = 0010
and so on ...

And i write my function which should display current value: 

void *displayValue(void *arg){
args[0];
char buf[50];

while(true){
  PtSet(&args[0],Pt_ARG_TEXT_STRING,buf,0);
  PtSetResources(pole,1,args);
 sleep(1);

}
}

pthread_create(NULL,NULL,displayValue);

It works but set only one values and next i get error "Memory fault (core dumped)"
What is wrong ? . I should run "displayValue" in new thread or maybe invoke in "main" ??