Derive all present threads statuses

Kernel
1

Hello,
In my system I need to develop a Watchdog module, that monitors all created in the project threads, to check whether they are suspended or not (if suspended, the MCU will be reset). In the past I have achieved such functionality by adding a wrapper to the xTaskCreate function- each time a thread was created, I have added its ID to the global list that was available also for the watchdog.

Now, I was wondering, whether I could omit that step- is there a way (by using only FreeRTOS API) to obtain the ID’s of all created threads in the system?

2

RTOS - uxTaskGetSystemState() ?

3

Hi and thank you for answer. It seems that this is exactly what I was looking for. The only issue I would have is that the manual states:

This function is intended for debugging use only as its use results in the scheduler remaining
suspended for an extended period.

Should this not be used in production code?

4

It depends if you can live with the behavior of the function. It needs to do pretty much work with the scheduler being disabled to collect/snapshot all the task information.
Your initial approach is much less intrusive.

5

Hi there,
I have a follow up question to this:

It depends if you can live with the behavior of the function. It needs to do pretty much work with the scheduler being disabled to collect/snapshot all the task information.

By this, do you mean that the sole fact of the functionality being enabled in the system is giving the overhead already (i.e., configUSE_TRACE_FACILITY set), or is it only in the moment of function calling?

Because I was thinking to run the function just once in the beginning to collects the threads ID’s and then never do it again.

6

No - there is no background activity dragging down performance. It’s a single (costly) call.