Question on locking strategy

[tonb]

Hi folks,

I'm looking at bakebit_nanohat_oled.py, and despite being very new to python, it seems to me that the lock that is attempted to make sure the draw code is not re-entrant, is broken.

`

lock.acquire()
is_drawing = drawing
page_index = pageIndex
lock.release()

if is_drawing:
    return

lock.acquire()
drawing = True
lock.release()

`

Two threads can easily reach the if statement, then both will proceed to set drawing=True. What am I missing? Cheers!