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Re: crypt mutex

From: Mikael Djurfeldt
Subject: Re: crypt mutex
Date: Mon, 23 Feb 2004 20:22:19 -0500
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)

Andreas Voegele <address@hidden> writes:

> I'd also prefer a minimal policy.  But what do you do if operating
> system A provides the reentrant function foo_r() while operating
> system B provides foo() only?  The Scheme procedure "foo" should
> behave the same on both systems.
> I think that there are four options:
> 1. Use foo_r() if available, otherwise protect foo() with a mutex
>    internally.
> 2. Use foo() and tell the user to protect the Scheme procedure in
>    threaded programs.  It doesn't make sense to use foo_r() in this
>    scenario.
> 3. Provide two Scheme procedures: "foo" and a thread safe version
>    "foo-r".  "foo-r" uses foo() and a mutex if foo_r() isn't
>    available.
> 4. Provide two modules, a normal and a thread safe version.  A command
>    line switch could be used to request thread safety.  IMHO this
>    would be useful for stuff like the POSIX and networking procedures.

Of these options I think 3 and 4 would add more complexity than is
payed for, and prefer 1 above 2 if foo_r isn't too uncommon.


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