Getting data from two DMA using Python NIFPGA API

[CCornu]

Hi,

This question is about how to use the Python API package to save simultaneously two set of data at different speed. I need for my application to save two different sets of data (different size, different type) and i'm using 2 target to host DMA. I'm using an NI FPGA 7971R card with an NI 5783 clip to measure signals. 

I did a simpler FPGA VI to illustrate my problem: Instead of the I/O data, I use a simple counter and the values are send to two buffers:

For the host part, i used two while loops + a timed loop to synchronize the stop condition between the 2 loops:

 

I compiled the FPGA part and tested the bitfile. It works well with LabVIEW.

Now I want to use the LabVIEW Bitfile inside a Python interface to use my measured data to control other connected devices. I know how to get one set of data from one DMA, by example:

from nifpga import Session
import time
Time_Acq = 3000 #ms
bitfile='test.lvbitx' #bitfile placed in directory
Data_stock=[]
with Session(bitfile,"PXI1Slot2") as session:
  session.reset()
  time.sleep(5)
  INPUT_period = session.registers['Period (ticks)']
  INPUT_period.write(100)
  DMA=session.fifos['DMA_1000']
  DMA.configure(50000)
  session.run()
  DMA.start()
  t0=t=time.time()
    while (t-t0)<Time_Acq :
    Data=DMA.read(10000,timeout_ms=5000)
    Data_stock.append(Data)
    t=time.time()
  session.abort()

Now, my question is:

How can I program two simultaneous while loop in Python to get the results of the two DMA? I don't need to share the variables in Real Time from one loop to another, except the STOP condition. Should I use a multithreading approach? If so, do I have to use Python in object? I'm not knowledgeable enough about the subject and i don't know where to start. I would really appreciate some insight about how to proceed.

Thanks a lot!