Apple

On 31 May 2016, at 20:00, email@hidden wrote:

> Hi,
>
> I'm trying to create real-time threads via the
> THREAD_TIME_CONSTRAINT_POLICY.
> It works fine, an interrupt after each computation cycle can be seen inside
> the profiler (Instruments / System Trace) but the constraint seems to be
> ignored.
>
> I would expect a penalty after the constraint time is over but the thread
> stays on the CPU starving other threads.
>
> That's the way I initialize the time constraint policy:
>
> thread_time_constraint_policy_data_t time_constraints;
>
> time_constraints.period = (int) NanosecondsToAbsolute (1000000); // 1
> ms
>
> time_constraints.computation = (int) NanosecondsToAbsolute (250000); //
> 0.25 ms
>
> time_constraints.constraint = (int) NanosecondsToAbsolute(500000); //
> 0.5 ms
>
> time_constraints.preemptible = 1;
>
> thread_policy_set(mach_thread_self (), THREAD_TIME_CONSTRAINT_POLICY,
> (thread_policy_t) &time_constraints, THREAD_TIME_CONSTRAINT_POLICY_COUNT);
>
> Any ideas how to get the constraint working?
>
> Regards,
> Julian