Re: [libgpiod] Question regarding locks / race conditions

[Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>]

On Sun, 16 Apr 2023 at 18:20, Sameh Mohamed <sameh4@xxxxxxx> wrote:
>
> Hello,
>
> Many thanks for your excellent work and contributions.  I've been learning about libgpiod in the last few days.
>
> Studying the cxx bindings examples, particularly around line request, I looked up the C code for gpiod_line_request_get_values_subset  and saw that it does not deal with any potential locks.
>
> I searched a bit on stackoverflow regarding Linux device drivers, and saw that it's basically up to the application to manage locks.
>
> As an inexperienced programmer in the Linux user-space; I have worked primarily in python and C++ client applications at a higher level, I wanted to confirm my understanding.  If I am writing some library to run the RaspberryPi that will make use of libgpiod-2.0.1, it will be up to me to avoid locks when making line requests, etc.
>
> Thanks,
> Sameh

Yes! It's a design approach low-level C libraries usually take and
libgpiod is no exception.

Bart