Specifying `blocking` and `timeout` when acquiring lock as a context manager
Neil D. Cerutti
neilc at norwich.edu
Fri Aug 8 12:05:58 EDT 2014
On 8/8/2014 9:25 AM, Ethan Furman wrote:
> On 08/08/2014 04:51 AM, cool-RR wrote:
>>
>> If I want to acquire a `threading.Lock` using the context manager
>> protocol,
>> is it possible to specify the `blocking` and `timeout` arguments that
>> `acquire` would usually take?
>
> Not that I know of, but why would you want to? There's no built-in 'if'
> with a 'with' block -- how would your code know whether it ran or not?
Perhaps defer release, a la a common Go pattern:
with contextlib.ExitStack() as stack:
acquired = lock.acquire(blocking=False)
if acquired:
stack.callback(lock.release)
do_stuff
--
Neil Cerutti
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