On Mon, 20 Sept 2021 at 13:15, Chris Angelico <ros...@gmail.com> wrote:
> On Mon, Sep 20, 2021 at 9:48 PM Gustavo Carneiro <gjcarne...@gmail.com>
> wrote:
> >
> > Note that you can wrap any of those methods with an asyncio.wait_for().
> >
> > try:
> > try:
> > await asyncio.wait_for(lock.acquire(), 1.0)
> > except asyncio.TimeoutError: # times out after 1 second
> > print("deadlock!")
> > return
> > do_things_with_lock()
> > finally:
> > lock.release()
> >
> >
> > Although I must admit, it would be convenient to have a timeout
> parameter directly in the methods like acquire, especially because it would
> make timeouts usable directly in the async context manager:
> >
> > async with lock.acquire(timeout=1.0):
> > do_things_with_lock()
> >
>
> How would this signal a timeout to your code? It looks lovely and
> clean, but there still need to be two branches, so you're not really
> going to avoid the try/except layer.
>
Right. If you needed to handle the timeout, you would need a try except.
Else the TimeoutError exception that gets raised is unhandled and bubbles
up.
try:
async with lock.acquire(timeout=1.0):
do_things_with_lock()
except asyncio.TimeoutError:
print("deadlock!")
return
I mean, this is just slightly more convenient, probably slightly less scary
for some people, but that's all.
ChrisA
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--
Gustavo J. A. M. Carneiro
Gambit Research
"The universe is always one step beyond logic." -- Frank Herbert
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