[gambit-list] Does gambit-c have call/ec?

Marc Feeley feeley at iro.umontreal.ca
Wed Jun 27 08:35:16 EDT 2007

On 25-Jun-07, at 4:27 PM, naruto canada wrote:

> Does gambit-c have call/ec? Thanks.

Call/ec is not predefined.  You can define it yourself like this:

(define call/ec call/cc)

Obviously, in this case the implementation of call/ec is not as fast  
as it could be.  On the other hand, Gambit's implementation of  
continuations is one of the most efficient.  For example, on the ctak  
benchmark which uses call/cc extensively, Gambit is about 2 orders of  
magnitude faster than MzScheme.  It would be interesting to see how  
MzScheme fairs when call/cc is replaced by call/ec in that benchmark  
(I can't run the test because my usual work machine is out of  
order).  See http://www.iro.umontreal.ca/~gambit/bench.html for other  
benchmark results (fibc also uses continuations extensively).


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