Multithreading

[Yigit Turgut]

I have a loop as following ;

start = time.time()
end = time.time() - start
 while(end<N):
	  data1 = self.chan1.getWaveform()
	  end = time.time() - start
	  timer.tick(10)  #FPS
	  screen.fill((255,255,255) if white else(0,0,0))
	  white = not white
	  pygame.display.update()
	  for i in range(self.size):
	      end = time.time() - start
	      f.write("%3.8f\t%f\n"%(end,data1[i]))

Roughly speaking, this loop displays something at 10 frames per second
and writes data1 to a file with timestamps.

At first loop data1 is grabbed but to grab the second value (second
loop) it needs to wait for timer.tick to complete. When I change FPS
value [timer.tick()], capturing period (time interval between loops)
of data1 also changes. What I need is to run ;

          timer.tick(10)  #FPS
	  screen.fill((255,255,255) if white else(0,0,0))
	  white = not white
	  pygame.display.update()

for N seconds but this shouldn't effect the interval between loops
thus I will be able to continuously grab data while displaying
something at X fps.

What would be an effective workaround for this situation ?