HAL to user process event passing

I need to signal upstream from boolean HAL pins or signals to a user space process, using a proper kernel-based IPC so the [slow] user space process can be suspended until signaled from a [fast] HAL thread. I could not find anything like that when consulting the existing component list, so I am about to create this component. But before I do I wanted to see if I was perhaps missing anything or if anyone had any other suggestions.
I am envisioning to simply take a boolean input and send it over via one of the standard IPC mechanisms, likely a message queue or a pipe.
Thanks!

forum.linuxcnc.org/47-hal-examples/44874...rs-tutorial-sort-off

can be a start ...

regards

Thanks. I just wanted to check if I was missing an existing mechanism/component.
I have already written the real-time component (and it's user process counterpart) I needed -- it took just a few lines of code.
Cheers

good.

Have a nice Lcnc adventure.