Time constraint real-time threads
Time constraint real-time threads
- Subject: Time constraint real-time threads
- From: Julian Dessecker <email@hidden>
- Date: Tue, 31 May 2016 10:46:52 +0200
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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