linux.conf.au, January 2003
      PRACTICALITIES: More Common Functions

Step 3: To wait for it
wait_event_interruptible(wq, condition).
Sleeps on wq until "condition" is true.
eg.
 			/* Wait until i == 1 */
 			ret = wait_event_interruptible(&my_wq, i == 1);
 			if (ret < 0)
 				/* We were interrupted.  (Probably ^C) */
 				return ret;
OR
To wake ONE up:
 			i = 1;
 			wake_up(&my_wq);

To wake ALL up:
 			i = 1;
 			wake_up_all(&my_wq);