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Re: Using define in multiple threads?

From: Ludovic Courtès
Subject: Re: Using define in multiple threads?
Date: Tue, 18 Nov 2008 11:20:41 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux)

Andy Wingo <address@hidden> writes:

> On Mon 17 Nov 2008 15:57, address@hidden (Ludovic Courtès) writes:

>> Besides, as Linas noted, the hash table implementation isn't
>> thread-safe, which makes it "unsafe" to `define' in parallel.
> Ah, this is why, then. I was baffled.
> IMO this is a bug; Guile can claim that "wierd behavior is expected"
> when using a data structure from multiple threads in without locking,
> but in this case the data structure is only being used implicitly.
> Modules should contain a lock that is taken when they are mutated.


I submitted a bug: .  I'm
not sure whether this can easily be fixed in 1.8, since that would
require adding a mutex to `module-type' and access it from C, which
would break the ABI.  Ideas?

> This isn't the first time I've wanted a functional hash table
> implementation...

I wrote long ago an implementation of functional FIFOs and one of
Bagwell's "VLists" [0]; VLists can be used at a building block for "hash
lists", which is a functional data structure akin to hash tables [0].
I've been willing to polish it and push it into Guile for some time, so
if you're motivated, that's even more motivating.  :-)



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