'interruptible_sleep_on()' is the Linux equivalent of 'tsleep()'. When we're sleeping for a condition, we can also just use wait_event_interruptible to close a potential race where the condition goes true between the time we checked it and when we go to sleep waiting on the event. Signed-off-by: Shaun Ruffell <sruffell@digium.com> Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9465 a0bf4364-ded3-4de4-8d8a-66a801d63aff