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macOS: apply time scaling for rt constraints

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This commit is contained in:
Robin Gareus 2021-05-01 02:49:06 +02:00
parent 65cc9264c8
commit 53e710bc5f
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 9 additions and 3 deletions
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12
libs/pbd/pthread_utils.cc
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@ -342,6 +342,12 @@ bool
pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns)
{
#ifdef __APPLE__
double ticks_per_ns = 1.;
mach_timebase_info_data_t timebase;
if (KERN_SUCCESS == mach_timebase_info (&timebase)) {
ticks_per_ns = timebase.denom / timebase.numer;
}
thread_time_constraint_policy_data_t policy;
#ifndef NDEBUG
mach_msg_type_number_t msgt = 4;
@ -356,9 +362,9 @@ pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns)
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.period = ticks_per_ns * period_clk;
policy.computation = ticks_per_ns * period_clk * .9;
policy.constraint = ticks_per_ns * 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,