[libcamera-devel] [PATCH v3 09/17] py: Switch to non-blocking eventfd

[Tomi Valkeinen]

On 18/08/2022 17:29, Jacopo Mondi wrote:
> Hi Tomi
> 
> On Fri, Jul 01, 2022 at 11:45:13AM +0300, Tomi Valkeinen wrote:
>> Blocking wait can be easily implemented on top in Python, so rather than
>> supporting only blocking reads, or supporting both non-blocking and
>> blocking reads, let's support only non-blocking reads.
>>
> 
> I'm not sure why it is better to ask application to do so on out
> behalf, having to expose the camera manager eventfd...

We want to expose the fd anyway. Most, or at least all serious uses will 
need the fd to wait for the events. That's how it is even before this 
series.

The point of this change is that instead of offering a function to get 
the ready events which blocks if there are no events, we offer a 
function which never blocks.

With this change the users can either just call the function whenever to 
see if there are events, or they can wait for the events with the fd. 
Previously this was not possible.

  Tomi