Re: Concurrency via isolated process/thread

[Ihor Radchenko]

Po Lu <luangruo@yahoo.com> writes:

> Ihor Radchenko <yantar92@posteo.net> writes:
>
>> Same with variables - even if some global variable needs to be locked,
>> it is unlikely that it will need to be accessed by another thread.
>
> I doubt symbol value cells will need to be individually interlocked.
> Emacs Lisp code will need to insert the appropriate instructions to
> prevent the CPU from undertaking optimizations on load and store
> operations on those cells when necessary. ...

I had a different simple scenario in mind:

(let ((oldval case-fold-search))
  (unwind-protect
    (progn (setq case-fold-search nil)
      ;; We surely do not want the value of `case-fold-search' to be
      ;; changed in the middle of `expensive-computation'.
      (expensive-computation))
    (setq case-fold-search oldval))

-- 
Ihor Radchenko // yantar92,
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