Method internal_empty

benchmarks/tbb/concurrent_queue.cpp:525–530

}

bool concurrent_queue_base_v3::internal_empty() const {
    ticket tc = my_rep->tail_counter;
    ticket hc = my_rep->head_counter;
    // if tc!=r.tail_counter, the queue was not empty at some point between the two reads.
    return ( tc==my_rep->tail_counter && ptrdiff_t(tc-hc-my_rep->n_invalid_entries)<=0 );
}

void concurrent_queue_base_v3::internal_set_capacity( ptrdiff_t capacity, size_t /*item_sz*/ ) {
    my_capacity = capacity<0 ? concurrent_queue_rep::infinite_capacity : capacity;