Quote: the 8 1/2 windowing system is entirely synchronous; communicating co-routines for mouse, keyboard, and window clients; reads I/O pipe requests when coroutines are quiet
8 1/2 is structured as a set of … [Pike 1989]. One coroutine manages the mouse, another the keyboard, and another … to run, 8 1/2 reads the next file … is entirely synchronous.
Google-1Google-2