How to check if lock is acquired in Django pglock

[Sencer Hamarat]

Using django pglock

I want to check if lock is acquired by another process

How can I do it?

[Sencer Hamarat]

Say, I have code block lie this:

           lock_id = "non_unique_lock"

with advisory_lock(lock_id, wait=True) as acquired:

# things to do

While one process has the lock, when the secondary process runs the same code block, the secondary process must raise an exception if it can't acquire the lock.

Please mind the lock id is the same for all processes.

Regards,

Sencer HAMARAT

[Kasper Laudrup]

On 22/09/2021 17.18, Sencer Hamarat wrote:
> Say, I have code block lie this:
>
>
>            lock_id = "non_unique_lock"
>
> with advisory_lock(lock_id, wait=True) as acquired:
>
> # things to do
>
>
>
> While one process has the lock, when the secondary process runs the same
> code block, the secondary process must raise an exception if it can't
> acquire the lock.

Not that I've ever heard of django-pglocks before, but if I understand
the documentation at https://github.com/Xof/django-pglocks#usage
correctly, would it simply be a matter of setting wait to False and
raising an exception is acquired is False?

Kind regards,

Kasper Laudrup

[Sencer Hamarat]

Thanks for reply, 

Afterwards, I figured out it was like in your comment.

Solution:

lock_id = "non_unique_lock"
with advisory_lock(lock_id, wait=False) as acquired:
    if acquired:
        # things to do

    else:

        raise Exception()  # or whatever you want.

Regards,

Sencer HAMARAT

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[Kasper Laudrup]

On 23/09/2021 17.12, Sencer Hamarat wrote:
> Thanks for reply,
>
> Afterwards, I figured out it was like in your comment.
>

Good to hear and thanks for sharing the solution.

Kind regards,

Kasper Laudrup