Re: [boost] [thread] feature request priority

Subject: Re: [boost] [thread] feature request priority
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2012-01-03 15:09:43

Vicente Botet wrote:
> Stewart, Robert wrote
> > Vicente J. Botet Escriba wrote:
>
> > 3. You could support a portable interface for thread
> > priorities, but you'd need to determine how to normalize
> > thread priorities since different OSes offer different ranges
> > of priority values.  It might be that the portable interface
> > provides only partial prioritization support for some
> > platforms, requiring the use of a native API when that's
> > insufficient.  That would give some support for portable
> > code, even if a modest utility that might be enough for many
> > applications.  Then again, the result might be so anemic that
> > it would never be used.
>
> My first intention was to provide the minimum, so that users
> are able to use the non-portable interface.
> I'm not sure we can provide a useful and portable interface for
> thread priorities, scheduling, .... The user could always
> define a class inheriting from thread_attributes and provide an
> interface that is portable for his application, which is less
> than requiring a portable interface in the generic sens. I will
> try to add an example in the documentation so that the user
> could find inspiration for his own application.

That's a reasonable first step.

> > 4. I wonder if a thread should own its attributes such that
> > clients can query for them later:
> >
> >    thread_attributes const &
> >    thread::attributes() const;
>
> The user can always associate the passed attributes to the
> thread either passing them as parameters or/and setting them as
> a thread specific pointer.

Yes and no.  Consider thread_group: you can't easily associate the attributes with a thread, if you have access to a thread_group and not the code that called add_thread().

BTW, does the patch address creating threads, with attributes, via thread_group::create_thread()?

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer                     using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP  http://www.sig.com

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