ardour/ardour
ardour/ardour
13
1
Fork 0
Code Pull Requests Releases Activity

Fix mach thread time constraints on M1

Browse Source 
or any system where timebase is not 1 tick per ns.
This commit is contained in:
Robin Gareus 2022-06-03 05:27:42 +02:00
parent 74ee7ee091
commit fd5d290217
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
libs/pbd/pthread_utils.cc
View File

@ -400,7 +400,7 @@ pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns, bool main)
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;
ticks_per_ns = (double)timebase.denom / (double)timebase.numer;
}
thread_time_constraint_policy_data_t tcp;
@ -415,17 +415,15 @@ pbd_mach_set_realtime_policy (pthread_t thread_id, double period_ns, bool main)
printf ("Mach Thread(%p) get: period=%d comp=%d constraint=%d preemt=%d OK: %d\n", thread_id, tcp.period, tcp.computation, tcp.constraint, tcp.preemptible, 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;
const double period_clk = period_ns * ticks_per_ns;
tcp.period = ticks_per_ns * period_clk;
tcp.computation = ticks_per_ns * period_clk * .9;
tcp.constraint = ticks_per_ns * period_clk * .95;
tcp.period = period_clk;
tcp.computation = period_clk * .9;
tcp.constraint = period_clk * .95;
tcp.preemptible = true;
#ifndef NDEBUG
printf ("period_ns=%f timebase.num=%d timebase_den=%d\n", period_ns, timebase_info.numer, timebase_info.denom);
printf ("period_ns=%f period_clk=%d timebase.num=%d timebase_den=%d ticks_per_ns=%f\n", period_ns, period_clk, timebase.numer, timebase.denom, ticks_per_ns);
printf ("Mach Thread(%p) request: period=%d comp=%d constraint=%d preemt=%d\n", thread_id, tcp.period, tcp.computation, tcp.constraint, tcp.preemptible);
#endif