macOS: apply time scaling for rt constraints
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65cc9264c8
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53e710bc5f
@ -342,6 +342,12 @@ bool
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pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns)
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{
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#ifdef __APPLE__
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double ticks_per_ns = 1.;
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mach_timebase_info_data_t timebase;
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if (KERN_SUCCESS == mach_timebase_info (&timebase)) {
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ticks_per_ns = timebase.denom / timebase.numer;
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}
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thread_time_constraint_policy_data_t policy;
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#ifndef NDEBUG
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mach_msg_type_number_t msgt = 4;
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@ -356,9 +362,9 @@ pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns)
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mach_timebase_info (&timebase_info);
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const double period_clk = period_ns * (double)timebase_info.denom / (double)timebase_info.numer;
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policy.period = period_clk;
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policy.computation = period_clk * .9;
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policy.constraint = period_clk * .95;
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policy.period = ticks_per_ns * period_clk;
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policy.computation = ticks_per_ns * period_clk * .9;
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policy.constraint = ticks_per_ns * period_clk * .95;
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policy.preemptible = true;
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kern_return_t res = thread_policy_set (pthread_mach_thread_np (thread_id),
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THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t)&policy,
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