From the POD documentation for the threads module:
$thread->join
This will wait for the corresponding thread to join. When the thread finishes, join() will return the return values of the entry point function. If the thread has been detached, an error will be thrown.
The context (scalar or list) of the thread creation is also the context for join(). This means that if you intend to return an array from a thread, you must use my ($thread) = threads-new(...)>, and that if you intend to return a scalar, you must use my $thread = ....
If the program exits without all other threads having been either joined or detached, then a warning will be issued. (A program exits either because one of its threads explicitly calls exit(), or in the case of the main thread, reaches the end of the main program file.)
Sounds just like what you're looking for. Check out the documentation for threads.
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