Function cleanup_background_threads

src/platforms/stub/coroutine_stub.impl.hpp:263–273

}

void cleanup_background_threads() FL_NOEXCEPT {
    auto& bg = ICoroutineRuntime::instance();
    bg.requestShutdown();
    auto& reg = BackgroundThreadRegistry::instance();
    fl::unique_lock<fl::mutex> lock(reg.mtx) FL_NOEXCEPT;
    for (auto& t : reg.threads) {
        if (t.joinable()) t.join();
    }
    reg.threads.clear();
    bg.resetShutdown();
}

bool is_shutdown_requested() FL_NOEXCEPT {
    return ICoroutineRuntime::instance().isShutdownRequested();