Return Graph varies from Call Graph?

[Dr Richard J. Reid]

In article <10904 at alice.UUCP> ark at alice.UUCP (Andrew Koenig) writes:
>In article <1990Jun5.142836.9821 at msuinfo.cl.msu.edu>, reid at cpswh.cps.msu.edu (Dr Richard J. Reid) writes:
>
>> Do you have any suggestions about how to vary the
>> return graph of function invocation from the call graph?
>
>Before we think about `how,' perhaps you could give
>us a few clues about `why.'
>-- 
>				--Andrew Koenig
>				  ark at europa.att.com

Why example:  Implementation of Co-routining.  See, for example,
AT&T tasking library for C++.

Dick