Tag: PLT

If anyone here is interested in genetic programming, the PLT implementation of my Push/PushGP system, for which several of you provided help over the last few weeks, is posted at http://hampshire.edu/lspector/schush.ss

–Lee
(via PLT)

PLT Scheme v4.2.5 adds real parallelism and class contracts.
Awesome.
(via Eli)

Via Eli on comp.lang.scheme:

#lang scheme
;; using the /proc filesystem
(call-with-input-file "/proc/self/loginuid" read)
;; running `id'
(require scheme/system)
(let ([o (open-output-string)])
  (parameterize ([current-output-port o]) (system "id -u"))
  (read (open-input-string (get-output-string o))))
;; calling getuid()
(require scheme/foreign)
(unsafe!)
((get-ffi-obj 'getuid #f (_fun -> _int)))

Here is a great article (and piece of code) that addresses one of the few complaints about tail-recursion, the inability to easily collect debugging information. It is just wonderful.

Via plt-dev:

I’m pleased to announce the initial release of parallel futures, a construct for fine-grained parallelism in PLT. Roughly speaking, a programmer passes a thunk to ‘future’ and it gets run in parallel. That “roughly” holds a few gotchas, partly because we’re just getting started and partly due to the technique we’re using. See the documentation for more details:
http://pre.plt-scheme.org/docs/html/futures/

Here is a library to do it. Thanks YC!
(via PLT)

Here is a good thread on conditional inclusion of code in PLT Scheme. Basically the OP wanted to use platform-specific module code (think development versus on the cluster). The recommended solution was to use dynamic-require.