Method decrease_count

src/runtime/task/task_queue.h:72–76

    int count() const { return _queue_length.load(std::memory_order_relaxed); }
    int decrease_count(int count = 1)
    {
        _queue_length_counter->add((int64_t)(-count));
        return _queue_length.fetch_sub(count, std::memory_order_relaxed) - count;
    }
    int increase_count(int count = 1)
    {
        _queue_length_counter->add(count);