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Move coreaudio_set_realtime_policy into libpbd

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This commit is contained in:
Robin Gareus 2017-10-30 15:57:39 +01:00
parent fee03dc467
commit c0dbe8eaaf
4 changed files with 41 additions and 35 deletions
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34
libs/pbd/pthread_utils.cc
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@ -266,3 +266,37 @@ pbd_set_thread_priority (pthread_t thread, const int policy, int priority)
return pthread_setschedparam (thread, SCHED_FIFO, &param);
}
bool
pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns)
{
#ifdef _APPLE_
thread_time_constraint_policy_data_t policy;
#ifndef NDEBUG
mach_msg_type_number_t msgt = 4;
boolean_t dflt = false;
kern_return_t rv = thread_policy_get (pthread_mach_thread_np (_main_thread),
THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t) &policy,
&msgt, &dflt);
printf ("Mach Thread(%p) %d %d %d %d DFLT %d OK: %d\n", _main_thread, policy.period, policy.computation, policy.constraint, policy.preemptible, dflt, rv == KERN_SUCCESS);
#endif
mach_timebase_info_data_t timebase_info;
mach_timebase_info(&timebase_info);
const double period_clk = period_ns * (double)timebase_info.denom / (double)timebase_info.numer;
policy.period = period_clk;
policy.computation = period_clk * .9;
policy.constraint = period_clk * .95;
policy.preemptible = true;
kern_return_t res = thread_policy_set (pthread_mach_thread_np (thread_id),
THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t) &policy,
THREAD_TIME_CONSTRAINT_POLICY_COUNT);
#ifndef NDEBUG
printf ("Mach Thread(%p) %d %d %d %d OK: %d\n", thread_id, policy.period, policy.computation, policy.constraint, policy.preemptible, res == KERN_SUCCESS);
#endif
return res != KERN_SUCCESS;
#endif
return false; // OK
}