[parrot/parrot] 97e537: Fix logical set_num_threads bug. Check the input

[GitHub]

  Branch: refs/heads/threads
  Home:   https://github.com/parrot/parrot
  Commit: 97e5370ee4a9411cecb01d1e5a4b9d0bdba8c98d
      https://github.com/parrot/parrot/commit/97e5370ee4a9411cecb01d1e5a4b9d0bdba8c98d
  Author: Reini Urban <rurban at cpanel.net>
  Date:   2012-09-17 (Mon, 17 Sep 2012)

  Changed paths:
    M src/thread.c

  Log Message:
  -----------
  Fix logical set_num_threads bug. Check the input

We need to check the input. num_threads is required to be -1 in this state.