If not, please consider this suggestion: add a method to QThread that
allows setting the scheduling policy, or allows setting the scheduling
policy and priority in a single call similar to pthread_setschedparam().
Sorry, the API in question is reserved for root. Since Qt applications are
almost always run as regular users, it would see very little use. Therefore, I
don't think we'll add it.
For the few users who need it and know what they're doing, like you, you can
use the pthreads or Linux-specific API. You're probably doing enough code
reviews and static analyses anyway for your application running as root that
this is not an undue burden.
audio applications have to use rt scheduling for the audio thread(s), unless one accepts glitches.
jack or pipewire tend to grant the real-time scheduling via @audio / @pipewire groups. afaict
nowadays users can also obtain realtime scheduling via RealtimeKit (which should come with a
watchdog thread).
---
that said, real-time scheduling is always quite platform-dependent with some parametrization
involved: SCHED_FIFO/SCHED_RR use priority values, SCHED_DEADLINE and THREAD_TIME_CONSTRAINT_POLICY
use deadlines / time constraints. on windows SetThreadPriority interacts with SetPriorityClass,
though there are also specialized scheduling classes like MMCSS ...
it's a bit difficult to wrap this into a QThread API
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