[plt-scheme] Continuations

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Wed Nov 15 03:40:04 EST 2006

> I think others have worked on transforming programs (by CPSing and
> making free variables explicit) to support serialized continuations,
> but I'm not sure of the details.

Matthew is pointing out that you can always CPS your program, but he's
alluding, amongst other things, to this work, which does better:

  Continuations from Generalized Stack Inspection

  Implementing first-class continuations can pose a challenge if the
  target machine makes no provisions for accessing and re-installing
  the run-time stack. In this paper, we present a novel translation
  that overcomes this problem. In the first half of the paper, we
  introduce a theoretical model that shows how to eliminate the
  capture and the use of first-class continuations in the presence of
  a generalized stack inspection mechanism. The second half of the
  paper explains how to translate this model into practice in two
  different contexts. First, we reformulate the servlet interaction
  language in the PLT Web server, which heavily relies on first-class
  continuations. Using our technique, servlet programs can be run
  directly under the control of non-cooperative web servers such as
  Apache. Second, we show how to use our new technique to copy and
  reconstitute the stack on MSIL.Net using exception handlers. This
  establishes that Scheme's first-class continuations can exist on
  non-cooperative virtual machines.

Perhaps something like this would be of value to you.


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