Re: save-excursion and multi-thread?

[Richard Stallman]

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  > RS> [Having point behave like a special variable] does not necessarily 
require
  > RS> changing the way point is implemented at low level.

  > EZ was quite clear that point does not live in lisp-space, and thus cannot
  > leverage the BLV (buffer-local-value) machinery of data.c (which I might add
  > is broken under threads, bug#48990).

That's true, but I doubt it is an obstacle.  The specpdl mechanism has
room for other specialized ways of swapping values in and out.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)