[hunchentoot-devel] Hunchentoot Thread Safety

[Mostafa Razavi]

Oh! So basically definitions are global, bindings thread-local. That 
makes sense. Thanks, Zach.

Hom

Zach Beane wrote:
> On Mon, Feb 04, 2008 at 11:44:48PM +0330, Mostafa Razavi wrote:
>   
>> Hi. I've been thinking about Hunchentoot's thread safety, lately. I see 
>> that for each request Hunchentoot spawns a new thread (if possible, of 
>> course) and binds the special variable *request* for it. Initially I 
>> thought this could cause problems, but when I did a few tests I found 
>> out everything actually seems to work correctly.
>>
>> Now, I'm not complaining why things are not going wrong, only I'm 
>> curious how is it that using a dynamic variable, which is one of those 
>> dreaded global variables after all, does not cause problems here.
>>     
>
> Special variables are global variables done right, and aren't to be
> dreaded in Common Lisp.
>
> In threaded Lisps, binding a special will typically make it
> thread-local. For example, in SBCL:
>
>   http://www.sbcl.org/manual/Special-Variables.html
>
> Zach
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