Re: [MIT-Scheme-devel] hash-table/modify!

[Joe Marshall]

You need to avoid a race between two processes trying to modify
the cell at the same time.

On Sat, Dec 19, 2009 at 10:49 PM, Taylor R Campbell <address@hidden> wrote:
> (HASH-TABLE/MODIFY! <hash-table> <key> <modifier> [<default>]) may
> call <modifier> with interrupts blocked, or with the same mask as in
> the caller of HASH-TABLE/MODIFY!.  I can't think of any reason to
> block interrupts during the call to <modifier>, and it seems confusing
> to me to call it in one of two very different states; does it seem
> sensible to pull the call to it outside WITH-TABLE-LOCKED! in the body
> of MAKE-METHOD:MODIFY!'s lambda in hashtb.scm?  And if we made that
> change, would it b necessary to lock the table at all (i.e., to block
> interrupts) for the single write that SET-ENTRY-DATUM! incurs?
>
>
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-- 
~jrm