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Re: Some introductory docs about C level threading
From: |
Marius Vollmer |
Subject: |
Re: Some introductory docs about C level threading |
Date: |
Wed, 09 Feb 2005 13:13:09 +0100 |
User-agent: |
Gnus/5.1003 (Gnus v5.10.3) Emacs/21.3 (gnu/linux) |
Ken Raeburn <address@hidden> writes:
>> SCM type will mean it's atomic.
>
> If use of the SCM type is assumed to be atomic in terms of CPU memory
> access and inter-CPU memory consistency, that's fine, but it should be
> documented as such -- and we should acknowledge that ports to
> architectures where that assumption does not hold may not be possible.
Yes, this is exactly my intention.
> [...]
> Depending on just how it works out, that could mean essentially
> declaring some of the scheme object types (like cons cells) as
> volatile, which would be poor for performance.
That would be no show-stopper: if Guile can only be correct with poor
performance on some platform, than we have to swallow that.
> And volatile declarations may fix the possibility of storing
> incomplete values, but I don't think it would deal with the
> cross-thread memory access ordering issue.
As long as accesses to SCM values are atomic, the ordering of
loads/stores across threads can be arbitrary.
- Re: Some introductory docs about C level threading, (continued)
- Re: Some introductory docs about C level threading, Ken Raeburn, 2005/02/01
- Re: Some introductory docs about C level threading, Kevin Ryde, 2005/02/01
- Re: Some introductory docs about C level threading, Ken Raeburn, 2005/02/01
- Re: Some introductory docs about C level threading, Kevin Ryde, 2005/02/06
- Re: Some introductory docs about C level threading, Ken Raeburn, 2005/02/08
- Re: Some introductory docs about C level threading, Marius Vollmer, 2005/02/09
- Re: Some introductory docs about C level threading, Kevin Ryde, 2005/02/09
- Re: Some introductory docs about C level threading, Marius Vollmer, 2005/02/10
- Re: Some introductory docs about C level threading,
Marius Vollmer <=
- Re: Some introductory docs about C level threading, Ken Raeburn, 2005/02/10
- Re: Some introductory docs about C level threading, Marius Vollmer, 2005/02/10
- Re: Some introductory docs about C level threading, Ken Raeburn, 2005/02/10
- Re: Some introductory docs about C level threading, Marius Vollmer, 2005/02/09
- Re: Some introductory docs about C level threading, Doug Evans, 2005/02/09
- Re: Some introductory docs about C level threading, Marius Vollmer, 2005/02/10
- Re: Some introductory docs about C level threading, Kevin Ryde, 2005/02/09
Re: Some introductory docs about C level threading, Marius Vollmer, 2005/02/09
Re: Some introductory docs about C level threading, Robert Uhl, 2005/02/14