Subj : Re: How to change thread priority without being root
To   : comp.programming.threads
From : David Butenhof
Date : Thu Aug 04 2005 12:51 pm

yccheok@gmail.com wrote:
> For priority, may I know bigger number means higher priority or smaller
> number means higher priority?

In POSIX realtime (SCHED_RR, SCHED_FIFO, SCHED_SPORADIC), numerically 
greater priority values have precedence over lower numeric values.

In traditional UNIX (nice) scheduling, it's the other way around, and 
the numeric ranges usually differ as well. So while you're safe if you 
stick entirely to portable POSIX functions and data and use the 
sched_getpriority_min/sched_getpriority_max functions correctly, if you 
MIX any POSIX and non-POSIX data or functions, or make assumptions, you 
can easily get yourself (and your code) confused.

-- 
Dave Butenhof, David.Butenhof@hp.com
HP Utility Pricing software, POSIX thread consultant
Manageability Solutions Lab (MSL), Hewlett-Packard Company
110 Spit Brook Road, ZK2/3-Q18, Nashua, NH 03062

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