How BT_LW_WQ Thread creat?

[Chaoyue Ying]

I'm checking the nrf_dm sample with NRF52840DK,nrf connect SDK.

Due to peer.c and dm.c create static thread,so I run debug and hope to get all thread and their priority.

I get the result as follow:

Experientially,the nagetives are ignored.

The main and idle thread also be ignored.And the peer_consumer_thred_id can be find in peer.c.

So the last one that BT_LW_WQ attracted my attention.Where it define and what it will do?

[Amanda Hsieh]

Hi, 

BT_LW_WQ is Long workqueue which is created by Zephyr OS for long-running tasks. See the configs. 

Regards,
Amanda H.

[Chaoyue Ying]

Hi,

I'm still puzzled what the long work queue to do.It relate to K_WORK_DEFINE?

[Amanda Hsieh]

See https://docs.zephyrproject.org/latest/releases/release-notes-3.2.html: 
A new Bluetooth long workqueue (CONFIG_BT_LONG_WQ) is used for processing ECC commands instead of the former dedicated thread.

[Chaoyue Ying]

If the ECC commands used to memory protection?

[Amanda Hsieh]

ECC is Error Correction Codes for memory.