Re: Kawa fails if used in multithreading

[Daniele Benegiamo <danielebenegiamo at fastwebnet dot it>]

Per Bothner wrote:
> On 08/07/2010 01:35 AM, Per Bothner wrote:
> > If so, I'll check the change in tomorrow.
>
> I checked in the fix.

Tested and works very well. Thanks for the fix.


> Of course you also want to consider why you're doing 'eval'
> so many times - unless it is just for testing.  You'd want
> to avoid compiling the same code many times, since that
> may be expensive.  One alternative is to eval an expression that
> evaluates to a procedure, which you can save and call many  times.
>
> If you're writing web server code, consider using the
> "KawaAutoHandler" mechanism, which automatically uses
> compiles and re-uses a "script":
> http://www.gnu.org/software/kawa/Self-configuring-page-scripts.html

My web service have to evaluate, given a set of inputs, a lot of 
different Scheme scripts to compare the resulting outputs. Actually we 
store the scripts into a database; on each request we bind some beans to 
an Environment and then "eval()" all them. As an optimization we would 
keep into the database also the compiled version of each script, and 
load it instead of re-compiling the source code if already in sync. But 
reading your documentation, I've found this sentence:

"There is an unsupported option to write the compiled file to a class 
file, but there is no support to use previously-compiled classes."

Does this means that I can't serialize the compiled Scheme program to 
database?


> If this doesn't work right, I want to fix it!

Nice to know it ;)


	Daniele