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Re: scm_i_fraction_reduce thread safety

From: Marius Vollmer
Subject: Re: scm_i_fraction_reduce thread safety
Date: Wed, 21 Jan 2004 01:03:33 +0100
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (gnu/linux)

Richard Todd <address@hidden> writes:

> 1) If you are worried about thread safety, the most fool-proof C
> interface probably does not allow separate access to numerator and
> denominator, since they need to be read in one atomic operation to
> ensure consistent results in the face of other mutating code.

Guile fractions can not mutated in general: they always represent one
value.  The mutation that might take place is a reduction, but that
might only happen once.  After a fraction is reduced, it stays that
way.  So when you have a reduced fraction you can safely return the
nominator, say, without having to worry that a later access to the
denominator will return something bogus.

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