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
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