From: Marius Vollmer <m.vollmer@ping.de>
Cc: Bill Schottstaedt <bil@ccrma.stanford.edu>,
Carl Witty <cwitty@newtonlabs.com>,
guile-devel@gnu.org
Subject: Re: scm_i_fraction_reduce thread safety
Date: Wed, 21 Jan 2004 01:03:33 +0100 [thread overview]
Message-ID: <87ad4ikw16.fsf@zagadka.ping.de> (raw)
In-Reply-To: <40022F15.30903@vzavenue.net> (Richard Todd's message of "Sun, 11 Jan 2004 23:22:29 -0600")
Richard Todd <richardt@vzavenue.net> 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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next prev parent reply other threads:[~2004-01-21 0:03 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-11 11:43 scm_i_fraction_reduce thread safety Bill Schottstaedt
2003-12-11 19:19 ` Carl Witty
2003-12-12 12:11 ` Bill Schottstaedt
2003-12-12 15:04 ` Paul Jarc
2003-12-12 23:23 ` Kevin Ryde
2004-01-10 22:38 ` Marius Vollmer
2004-01-10 23:29 ` Kevin Ryde
2004-01-11 1:31 ` Marius Vollmer
2004-01-12 0:51 ` Kevin Ryde
2004-01-12 5:22 ` Richard Todd
2004-01-14 21:09 ` Kevin Ryde
2004-01-21 0:03 ` Marius Vollmer [this message]
2004-01-21 0:00 ` Marius Vollmer
2004-01-21 3:11 ` Carl Witty
2004-01-21 21:06 ` Marius Vollmer
2004-01-27 22:15 ` Dirk Herrmann
2004-01-27 23:24 ` Rob Browning
2004-01-29 19:35 ` Marius Vollmer
2004-01-29 20:32 ` Rob Browning
2004-01-30 14:45 ` Mikael Djurfeldt
2004-02-01 18:49 ` Andy Wingo
-- strict thread matches above, loose matches on Subject: below --
2003-12-09 20:39 Kevin Ryde
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