In MQX, how do you determine which LW Semaphore is blocked?

[dave408]

I guess the title says it all.  :smileyhappy:

I can certainly do the investigative work to track which LW Semaphore is getting blocked by looking for sequential calls to OSA_SemaWait, but since the MQX task-aware debugging plugin can tell me that a task is stuck waiting on a blocked LW semaphore, why doesn't it tell me which one?  It would be such a time saver!!!

[danielchen]

Hi Dave

I tested the demo   C:\Freescale\Freescale_MQX_4_1\mqx\examples\lwsem, as you said, I can see that one task is stuck waiting on a blocked lw semaphore.

I think it is a good idea to show the blocked semaphore.

But when you show the light weight semaphores, you can know the waiting semaphore, see the below picture.

Regards

Daniel

[dave408]

danielchen@fsl​ I was wrong!  I get a "Not installed" message when I check the LW message queue and LW semaphore windows.  Do you have any suggestions for what I can do to install them?

[dave408]

What's interesting is that I'm debugging another project at the moment, and now I do have Lightweight Semaphores enabled:

But now the annoying thing is that I have a problem where lwIP is blocked in a LW message queue, but as you can see in the image above, I can't view the message queues!

Does anyone have any suggestions about this?

[dave408]

Thanks, Daniel!  I could have sworn that the last time I looked at that screen, the Symbol column was entirely empty.  I'll check it again the next time I get stuck!  :smileyhappy: