Flow handler for AEGP_ComputeIfNeededAndCheckout in the compute cache api

My issue is that we need to make sure frame n-1 is finished rendering before we can render frame n because there are cases where frame n will need the data of frame n-1.
Is it true that when rendering at frame n - 1, we will save the opaque_optionsP of frame n-1 and call AEGP_ComputeIfNeededAndCheckout after rendering to cache. Counting frame n will call AEGP_ComputeIfNeededAndCheckout with opaque_optionsP of frame 1 to check if rendering has finished. Am I understanding that right?

Below is my code in PF_Cmd_SMART_RENDER:

A_long* preFrame = nullptr; // This variable will be saved globally
AEFX_SuiteScoper<AEGP_ComputeCacheSuite1> computeCacheSuite1{ in_data, kAEGPComputeCacheSuite, kAEGPComputeCacheSuiteVersion1 };
AEGP_CCCheckoutReceiptP receiptForPreviousFrame = nullptr;
in_dataP = in_data;
if (in_data->current_time > 0)
{
    if (secondpreFrame == nullptr)
    {
        secondpreFrame = preFrame;
    }
    ERR(computeCacheSuite1->AEGP_ComputeIfNeededAndCheckout(computeClassIdP, preFrame, false, &receiptForPreviousFrame));
    if(err == A_Err_NOT_IN_CACHE_OR_COMPUTE_PENDING) {
        ERR(computeCacheSuite1->AEGP_ComputeIfNeededAndCheckout(computeClassIdP, preFrame, true, &receiptForPreviousFrame));
        spdlog::info("A_Err_NOT_IN_CACHE_OR_COMPUTE_PENDING 1");
    }
    computeCacheSuite1->AEGP_CheckinComputeReceipt(receiptForPreviousFrame);
}
...
  //render frame
...
    AEGP_CCCheckoutReceiptP receiptForCurrentFrame = nullptr;
    ERR(computeCacheSuite1->AEGP_ComputeIfNeededAndCheckout(computeClassIdP, &in_data->current_time, false, &receiptForCurrentFrame));
    if (err != PF_Err_NONE) {
        spdlog::info("save AEGP_ClassUnregister fails");
    }
    if (err == A_Err_NOT_IN_CACHE_OR_COMPUTE_PENDING) {
        ERR(computeCacheSuite1->AEGP_ComputeIfNeededAndCheckout(computeClassIdP, &in_data->current_time, true, &receiptForCurrentFrame));
    }
    computeCacheSuite1->AEGP_CheckinComputeReceipt(receiptForCurrentFrame);
}
preFrame = &in_data->current_time;