in the server. this fixes the problem with the limited number of
  threads because of them being non-detached. pthread_detach_this_tread()
  expands to empty on most platforms including SuSE but pthread_detach(pthread_self())
  is not portable on Windows so the first macro should be used and the thread
  to be detached we have to create it as such.
fix for bug#16984 (Events: running out of threads)
WL#1034 (Internal CRON)