Correct way to spawn many and stoping when one finishes ?

[klimp via Digitalmars-d-learn]

Is this corrrect ? Each task searches for the same thing so when 
once has found the others don't need to run anymore. It looks a 
bit strange not to stop those who havent find the thing:

import std.concurrency, core.thread, std.random;

void task()
{
     size_t i;
     while (true)
     {
         Thread.sleep(dur!"nsecs"(rndGen.front / 100));
         ++i;
         rndGen.popFront;
         if (i == 100)
         {
             send(ownerTid, true);
             break;
         }
     }
}

void main()
{
     Tid s0 = spawn(&task);
     Tid s1 = spawn(&task);
     //...
     Tid sN = spawn(&task);
     receiveOnly!bool;
}