std.concurrency: ownerTid vs thisTid

[miazo via Digitalmars-d-learn]

Hi,

The following simple program:
import std.stdio, std.concurrency;

void f1() {
    writeln("owner: ", ownerTid);
    writeln("worker: ", thisTid);
}

void main() {
    writeln("owner: ", thisTid);
    writeln("worker: ", spawn(&f1));
}

Gives me the following result:

owner: Tid(18fd58)
worker: Tid(18fd58)
owner: Tid(24afe38)
worker: Tid(24afe38)

Is it correct? My expectation was that:
- thisTid called from main will be the same as ownerTid called 
from f1
- thisTid called from f1 will be the same as value returned by 
spawn()

Thank you for your help.