led(9) blinking using dedicated thread

From: Andriy Gapon <avg_at_FreeBSD.org>
Date: Mon, 19 Jul 2021 11:36:29 +0300
I would like to change led(9) so that it invokes LED control methods from a 
thread rather rather than from a callout.  This is to support LEDs behind USB 
and I2C where (common) implementations use sleeping waits.

I have created a review request for the proposed change:
https://reviews.freebsd.org/D31215

In the current version the thread is created at init time and is kept around 
forever.  That could be changed to create the thread when a first blinking LED 
is configured.  Also, the thread could be destroyed when a last "blinker" is 
removed.

Alternatively, I am considering whether static (no blinking) LED state changes 
should also be done asynchronously via the thread.


-- 
Andriy Gapon
Received on Mon Jul 19 2021 - 08:36:29 UTC

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