Hey guys.
Consider a function (lets call it A) which returns 1 if a process finished running, otherwise 0.
I would like to write another function which should wait until the process will finish running.
What's the best why to do it?

I thought of using the while loop and the wait(30); command.
Something like this:

   until(A()) {
      sleep(30);
   }
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I also can just call this subroutine until it will finish, although I don't think its smart because of all unnecessary junk.
What's the best way to do so?
I'm looking for the cleanest way to do it.