PT_FLAG_SCOPE_SYSTEM
(PT_FLAG_DETACHED | PT_FLAG_SCOPE_SYSTEM | PT_FLAG_EXPLICIT_SCHED);
if (attr->pta_flags & PT_FLAG_SCOPE_SYSTEM)
attr->pta_flags &= ~PT_FLAG_SCOPE_SYSTEM;
attr->pta_flags |= PT_FLAG_SCOPE_SYSTEM;