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Re: Locks and threads

From: Neil Jerram
Subject: Re: Locks and threads
Date: Fri, 13 Mar 2009 19:13:07 +0000
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux)

Andy Wingo <address@hidden> writes:

> Hey Neil,
> On Thu 12 Mar 2009 01:53, Neil Jerram <address@hidden> writes:
>> Thanks to a hint from helgrind, I think the problem might be that the
>> symbols obarray is not thread-safe.  But surely using a mutex for
>> every symbol that Guile reads would be terrible for performance...
> Dunno, in GStreamer we found that uncontended locks are cheap cheap
> cheap. AFAIU they don't even cause context switches. And the reader will
> be less important in terms of e.g. startup time once the VM lands.

Hi Linas, Andy,

Many thanks for your input on this.  I'll go ahead with a mutex or
rwlock.  First thing is to see if it fixes the problem; if it does,
I'll try to measure the performance impact.


PS. And thanks Clinton too - although I'd prefer not to have to do
such a big rewrite if we can manage without it.

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