can't understand why code do not working

[Suliman via Digitalmars-d-learn]

Already 1 hour I am looking at example from 
http://ddili.org/ders/d.en/concurrency.html and my modification 
of it, and can't understand what's difference? Why it's output 
only:
1
3

and then do not do nothing!
import std.stdio;
import std.concurrency;
import core.thread;


void main()
{
   Tid wk = spawn(&worker);
   foreach(v; 1..5)
   {
    wk.send(v);
    int result = receiveOnly!int();
    writeln(result);
   }
}

void worker()
{
    int value = 0;
    value = receiveOnly!int();
    writeln(value);
    int result = value * 3;
    ownerTid.send(result);
}