Difference between co-routine and thread?

hi,
i keep bumping into people who talk about co-routines? does anyone know if there is any difference between this and a thread (internet definitions don't seem to suggest so..), if there is no difference is this just a historical term? is it tied to any particular platform/language?
thanks,
asjf

i keep bumping into people who talk about co-routines?How old were they? -:) The term is mix betweenvconcurrent and subroutine. A co-routine starts running
in its own thread when called.Its own thread you say? Luxury! Pure luxury! Coroutines existed before multiple threads existed.
All coroutines were marked 'runnable' at startup and when one (and the only) running coroutine wanted
to relinguish control of the processor it had to say so explicitly by calling some 'yield' command.
This command was the entry point to a primitive scheduler that randomly picked another runnable
coroutine; the latter had to 'yield' somewhere in the near future to keep the whole shebang running.
In those days there were no multiple threads; Luxury! Pure modern luxury! And in those days computers
were made of wood and I am not old! ;-)
kind regards,
Jos ( <--- not old )

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