Re: k_poll usage

Luiz Augusto von Dentz

Hi Vakul,

I had plans to introduce k_poll support for other objects but that
would probably make CONFIG_POLL mandatory, though we the changes
introduced for userspace I think we might have to delay this a little
bit to see how the APIs will gonna look like at the end.

On Tue, Oct 17, 2017 at 1:18 PM, Vakul Garg <> wrote:
Hi Paul

Thanks for the reply. It seems quite restrictive that most of zephyr IPC
does not support k_poll. How applications can simultaneously poll on fifo,

Any reason why kernel kept limited usage for k_poll?


Get Outlook for Android

From: Paul Sokolovsky <>
Sent: Tuesday, October 17, 2017 3:41:51 PM
To: Vakul Garg
Subject: Re: [Zephyr-users] k_poll usage

Hello Vakul,

On Fri, 13 Oct 2017 05:48:22 +0000
Vakul Garg <> wrote:


The zephyr documentation says k_poll to operate on objects - kernel
fifo, poll signal, semaphore. Can't it also be used on mailboxes,
message queues etc?
Looking at the include/kernel.h, all k_poll'able object must have
a .poll_events member (either directly or via _POLL_EVENT macro).
Mailboxes and message queues don't have it. This can be confirmed by
looking at kernel/poll.c:register_event(), which handles each of the
supported pollable objects via a switch statement.



Best Regards,
Paul | Open source software for ARM SoCs
Follow Linaro:!/linaroorg -

Zephyr-users mailing list
Luiz Augusto von Dentz

Join to automatically receive all group messages.