[Jack-Devel] Non-blocking I/O in process callback

[Harry van Haaren]

Hi Xavi,

If the time to complete the function is deterministic, it is real time safe.

System calls (blocking ones) have "unbounded execution time", and as such
are not rt safe.

If your I/O will take a significant amount of time, I suggest offloading to
a worker thread.

Hth, -Harry
On 30 Nov 2015 11:11, "Xavier Mendez" <me at jmendeth.com> wrote:

> Hello,
>
> I'm wondering whether it's safe to do non-blocking reads or writes from
> inside the process callback.
>
> From what I've seen, non-blocking I/O doesn't cause the process to go into
> blocked state, and the realtime scheduler should not switch to another
> process. But the documentation doesn't seem to allow them:
>
> > [...] it cannot call functions that might block for a long time. This
> > includes all I/O functions (disk, TTY, network), [...]
>
> So, is it safe to use non-blocking I/O in the process callback?
>
> Thank you,
> Xavi
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