Method try_acquire_flag

source/executors/thread_pool_executor.cpp:108–121

}

bool idle_worker_set::try_acquire_flag(size_t index) noexcept {
    const auto worker_status = m_idle_flags[index].flag.load(std::memory_order_relaxed);
    if (worker_status == status::active) {
        return false;
    }

    const auto before = m_idle_flags[index].flag.exchange(status::active, std::memory_order_relaxed);
    const auto swapped = (before == status::idle);
    if (swapped) {
        m_approx_size.fetch_sub(1, std::memory_order_relaxed);
    }

    return swapped;
}

size_t idle_worker_set::find_idle_worker(size_t caller_index) noexcept {
    if (m_approx_size.load(std::memory_order_relaxed) <= 0) {