I'd imagine that context manager here simply wouldn't cancel the current
task if the lock can be acquired in time:
```
async with lock.acquire(timeout=1.0):
await do_things_with_lock()
```
On Mon, 20 Sep 2021, 14:15 Gustavo Carneiro, <[email protected]> wrote:
> On Mon, 20 Sept 2021 at 13:15, Chris Angelico <[email protected]> wrote:
>
>> On Mon, Sep 20, 2021 at 9:48 PM Gustavo Carneiro <[email protected]>
>> 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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