Method add_handler

src/platforms/stub/isr_stub.hpp:112–133

    }

    void add_handler(stub_isr_handle_data* handler) FL_NOEXCEPT {
        fl::unique_lock<fl::mutex> lock(mMutex) FL_NOEXCEPT;

        // Assign unique ID
        handler->mHandleId = mNextHandleId++;

        // Calculate initial tick time
        auto now = get_time_us();
        u64 period_us = handler->mFrequencyHz > 0 ? (1000000ULL / handler->mFrequencyHz) : 0;
        handler->mNextTickUs = now + period_us;

        mHandlers.push_back(handler);

        // Start timer thread if not already running
        if (!mTimerThread) {
            mShouldStop = false;
            mTimerThread = fl::make_unique<fl::thread>(&TimerThreadManager::timer_thread_func, this);
        } else {
            // Wake up the timer thread to process the new handler
            mCondVar.notify_one();
        }
    }

    void reschedule_handler(stub_isr_handle_data* handler) FL_NOEXCEPT {
        fl::unique_lock<fl::mutex> lock(mMutex) FL_NOEXCEPT;