Barney Stratford added the comment:
You're absolutely right. I had elided the details of the locking from my
original use case, but now I look at it again, I see that even what I did have
wasn't enough.
I've made a new patch that takes a lock properly. A non-blocking acquisition of
the lock will serve the same purpose as looking to see if there is a line being
read, and will also prevent the interpreter from starting to read a new line
while the text is being printed.
My use case now looks like this.
reading_lock = threading.Lock ()
readline.set_lock (reading_lock)
def describe (indicator):
if reading_lock.acquire (False):
print (indicator.description)
reading_lock.release ()
else:
print ()
print (indicator.description)
readline.forced_update_display ()
----------
Added file: http://bugs.python.org/file40104/patch.txt
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