[plt-scheme] PLT Scheme v370

From: YC (yinso.chen at gmail.com)
Date: Tue May 22 15:15:04 EDT 2007

Just downloaded it and it feels A LOT faster on Windows!  Thanks to you
all!!! ;)


On 5/21/07, Eli Barzilay <eli at barzilay.org> wrote:
> PLT Scheme version 370 is now available from
>   http://download.plt-scheme.org/
> Some highlights:
> * The conservative garbage collector (CGC) has been replaced with a
>   precise garbage collector (3m) in the standard build.  For most
>   users, this change simply amounts to "better performance in space
>   and time".  For example, a long-running DrScheme instance typically
>   uses much less memory than before.
>   The new memory manager also supports a new "Limit Memory..." option
>   (in DrScheme's "Scheme" menu) to limit the memory use of a
>   programming running inside DrScheme.
>   For those who work with C-implemented libraries and extensions, the
>   switch to precise collection may complicate interoperability.  To a
>   large extent, however, `(lib "foreign.ss")' works the same with both
>   collectors.  (But note that the 3m is a moving collector, so be
>   careful with passing Scheme objects to C.)
>   Although our pre-built binaries use the new collector, builds from
>   source using the conservative collector are still supported.
> * For a program written with one of the the "How to Design Programs"
>   (HtDP) languages, DrScheme saves the program with meta-information
>   that identifies the language and records the teachpacks used by the
>   program.  DrScheme's teachpack GUI now works only with the HtDP
>   languages.  In other languages, use `require' to access teachpacks.
>   The meta-information is in the form of a reader extension that turns
>   the file content into a `module'-based program, which means that
>   teaching-language files can be loaded directly into MzScheme or used
>   with other PLT Scheme tools.
> * The HtDP "world.ss" and "image.ss" teachpacks have been revised,
>   including support for the creation of animated GIFs.
> * Unit-based servlets are no longer supported in the web server.  Use
>   module-based servlets, instead.  (Servlets can be implemented using
>   a `unit' within a `module', but the web server's API is provided
>   through a module.)
> * A new `(lib "unit.ss")' library replaces the old one and provides a
>   simpler and more flexible syntax.  The `(lib "unitsig.ss")' library
>   is deprecated but still available as `(lib "unitsig200.ss")', and
>   the old `(lib "unit.ss")' is available as `(lib "unit200.ss")'.
> Feedback Welcome,
> --
>           ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
>                   http://www.barzilay.org/                 Maze is Life!
> _________________________________________________
>   For list-related administrative tasks:
>   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
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