use threads;

async{
    print "I'm doing this over here while he's...", sleep 1 while 1 
}; 
print "doing that over there, while...", sleep 1 while 1;

I'm doing this over here while he's... 1.001
doing that over there, while... 1.001
I'm doing this over here while he's... 0.999772
doing that over there, while... 0.999429
I'm doing this over here while he's... 0.999626
doing that over there, while... 0.99956
I'm doing this over here while he's... 0.999724
doing that over there, while... 0.999355
Terminating on signal SIGINT(2)