libc_r silliness

[David Xu]

----- Original Message ----- 
From: "John Baldwin" <jhb at FreeBSD.org>
To: "Terry Lambert" <tlambert2 at mindspring.com>; <deischen at FreeBSD.org>
Cc: <threads at FreeBSD.org>
Sent: Tuesday, July 08, 2003 9:23 PM
Subject: Re: libc_r silliness


> On Tuesday 08 July 2003 06:35 am, Terry Lambert wrote:
> > Daniel Eischen wrote:
> > > On Mon, 7 Jul 2003, John Baldwin wrote:
> > > > > I don't really know how to handle this.  We can wrap
> > > > > sched_get_priority_{min,max}(), but how do we know whether
> > > > > the application wants process priorities or thread
> > > > > priorities?
> > > >
> > > > Ugh.  Perhaps the manpage should at least be updated to not
> > > > reference the macros.  What does POSIX say about the confusion
> > > > between sched_get_priority_{min,max}?
> > >
> > > Sure, update the man pages if you want ;-)
> > >
> > > I have not found anything yet regarding sched_get_priority_{min,max}
> > > confusion in the POSIX spec...
> >
> > http://www.opengroup.org/onlinepubs/007904975/functions/sched_get_priority_
> >max.html
> >
> > The functions take a policy parameter; they are supposed to
> > return "appropriate" values, which I took to mean "appropriate
> > to the policy parameter supplied at the time they were called":
> >
> > int sched_get_priority_max(int policy);
> > int sched_get_priority_min(int policy);
> >
> > The sched_get_priority_max() and sched_get_priority_min()
> > functions shall return the appropriate maximum or minimum,
> > respectively, for the scheduling policy specified by policy.
> 
> Yes, but in a multithreaded program when I call 
> sched_get_priority_max(SCHED_RR), does that tell me the maximum process 
> SCHED_RR priority for use with sched_setschedparam() or does it tell me the 
> maximum thread SCHED_RR priority for use with pthread_setschedparam()?
> 
See page:
http://www.opengroup.org/onlinepubs/007904975/basedefs/sched.h.html
They are marked with 'TPS' code, so they are applied to thread scheduling.
Otherwise, they should be marked with 'PS' code.
This is the code page:
http://www.opengroup.org/onlinepubs/007904975/help/codes.html


> -- 
> 
> John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> "Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/
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David Xu