5 - Scheduling Parameter Determination

glibc Breakdown thread pthread

  /* Determine scheduling parameters for the thread.  */
  if (__builtin_expect ((iattr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0, 0)
      && (iattr->flags & (ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET)) != 0)
    {
      /* Use the scheduling parameters the user provided.  */
      if (iattr->flags & ATTR_FLAG_POLICY_SET)
        {
          pd->schedpolicy = iattr->schedpolicy;
          pd->flags |= ATTR_FLAG_POLICY_SET;
        }
      if (iattr->flags & ATTR_FLAG_SCHED_SET)
        {
          /* The values were validated in pthread_attr_setschedparam.  */
          pd->schedparam = iattr->schedparam;
          pd->flags |= ATTR_FLAG_SCHED_SET;
        }
 
      if ((pd->flags & (ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET))
          != (ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET))
        collect_default_sched (pd);
    }