Method set_priority

benchmarks/tbb/task_group_context.cpp:476–492

#if __TBB_TASK_PRIORITY
void task_group_context::set_priority ( priority_t prio ) {
    __TBB_ASSERT( prio == priority_low || prio == priority_normal || prio == priority_high, "Invalid priority level value" );
    intptr_t p = normalize_priority(prio);
    if ( my_priority == p && !(my_state & task_group_context::may_have_children))
        return;
    my_priority = p;
    internal::generic_scheduler* s = governor::local_scheduler_if_initialized();
    if ( !s || !s->my_arena->propagate_task_group_state(&task_group_context::my_priority, *this, p) )
        return;
    // Updating arena priority here does not eliminate necessity of checking each
    // task priority and updating arena priority if necessary before the task execution.
    // These checks will be necessary because:
    // a) set_priority() may be invoked before any tasks from this task group are spawned;
    // b) all spawned tasks from this task group are retrieved from the task pools.
    // These cases create a time window when arena priority may be lowered.
    s->my_market->update_arena_priority( *s->my_arena, p );
}

priority_t task_group_context::priority () const {
    return static_cast<priority_t>(priority_from_normalized_rep[my_priority]);