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Re: Are there plans for a multi-threaded Emacs?

From: Miles Bader
Subject: Re: Are there plans for a multi-threaded Emacs?
Date: 17 Nov 2003 13:29:31 +0900

"Dhruva Krishnamurthy" <address@hidden> writes:
>  Is there some place/person who can elaborate the reason for not
>  supporting multi-threading for GNU Emacs. Is it because there is no
>  strong case for supporting/requiring a multi-threaded GNU Emacs or the
>  sheer complexity in making GNU Emacs a multi-threaded application.

Because it's very hard, or at the least would require a lot of work.

Multi-threading would require all of emacs -- including elisp code -- to
be made thread-safe.

Consider a simple bit of elisp code:  (setq GLOBAL (cons 'x GLOBAL))
In a pre-emptively threaded emacs, another thread could run between
accessing GLOBAL and setting it.  Whoops.

((lambda (x) (list x x)) (lambda (x) (list x x)))

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