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Re: guile fibers - looking for adivce

From: Chris Vine
Subject: Re: guile fibers - looking for adivce
Date: Sun, 6 Sep 2020 20:26:57 +0100

On Sun, 6 Sep 2020 02:47:57 +0200
Jan Wielkiewicz <> wrote:
> Hello,
> I'm still on my way of integrating Guile Fibers and GOOPS, but I
> encountered some weird behavior.
> Say I have an object with with one slot being a vector and two methods
> accessing the vector concurrently/parallelly. The methods
> accessing/editing the vector are time consuming and are meant to be ran
> frequently. Assuming I would like to run the methods on separate
> fibers, how do I make sure the state of the object doesn't
> suddenly change during execution of a method? I would like the methods
> to be able to edit the state of the object, but in a cooperative manner.
> The weird behavior I've encountered is that sometimes when running the
> first method (A) and right after starting the second method (B), the
> method B tries to access the vector before the method A finishes its
> job. What should I do to make accessing the vector cooperatively, yet
> to run the time consuming on separate fibers for concurrency?
> I was thinking about implementing slots in objects as sending and
> receiving messages instead of regular variables, but still there were
> some problems with the object state.
> Could someone explain me what should I do?

You should use channels.

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