[Development] Thread priority on Linux - Qt 6.9.1

[Thiago Macieira]

On Saturday, 28 June 2025 00:20:01 Central European Summer Time Art Greenberg 
wrote:
> Actually, its not necessary to be root to use the pthreads priority API.
> Appropriate settings in /etc/security/limits.conf enable non-root users
> to alter thread priority.

I believe you're talking about the rtprio limit, or RLIMIT_RTPRIO option to 
setrlimit(2) call. That's still default to 0 (no real time privileges) on the 
kernel, which means it still requires admin action to enable.

> I note that there are several calls to setPriority() found in the Qt
> libraries, such as Qt3D.

They're just no-op on Linux. As Tim said in his reply, applications can 
request RT priority from RTKit.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel Platform & System Engineering
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