Re: mt question/problem

On 11/2/09, Don Cohen <don-sourceforge-xxz <at> isis.cs3-inc.com> wrote:
> Sam Steingold writes:
>  > > * Don Cohen <qba-fbheprsbetr-kkm <at> vfvf.pf3-vap.pbz> [2009-11-01 17:41:30
> -0800]:
>  > > Why is the variable C unbound in the thread when the initial bindings
>  > > list seems to contain a value for it?
>  > because initial-bindings are for global specials:
> I don't see anything about this in the doc.
> What's the difference between a global special and any other kind?

defparameter, defvar and proclaimed specials cause per value cell to
be allocated for symbols. Special variables may have different
bindings in different threads.

> How does :initial-bindings compare to something like
> (let ((vars '(a b c))(vals (list a b c)))
>  (mt:make-thread
>   (lambda ()
>    (progv vars vals ...))))

If A, B and C are not special variables they will not have per thread
allocated value cells - bindings that progv will establish will be
shared between all threads (values of A,B and C in all threads will be
the same).

Note also that vars and vals values will be shared between two threads
(in case above it's not important) - in order to avoid this (let
((vars vars) (vals vals)) (mt:make-thread ...)) may be used.

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