Class PollNeededCallback

src/fl/channels/driver.h:58–76

    /// means the manager should wake and poll. Drivers that do not have such a
    /// signal leave this unused; the manager's timed wait slice is the fallback.
    struct PollNeededCallback {
        using Callback = void (*)(void*) FL_NOEXCEPT;

        Callback callback = nullptr;
        void* context = nullptr;

        constexpr PollNeededCallback() FL_NOEXCEPT = default;
        constexpr PollNeededCallback(Callback cb, void* ctx) FL_NOEXCEPT
            : callback(cb), context(ctx) {}

        bool isValid() const FL_NOEXCEPT { return callback != nullptr; }
        explicit operator bool() const FL_NOEXCEPT { return isValid(); }

        void invoke() const FL_NOEXCEPT {
            if (callback != nullptr) {
                callback(context);
            }
        }
    };

    /// @brief ISR-safe storage for a poll-needed callback handle.
    ///