Hello I read in the FreeRTOS documentation that there are 4 States of the tasks : Running, Ready, Blocked and Suspended. But in the IAR (freertos plugin that show running tasks) I see tasks in Running, Ready, Blocked and Delaying states. I thought that maybe Suspended Delaying states are the same, but the only way to set task to Suspend state is explicitly commanded to do so. And I didn’t set any task to Suspend state explicitly. So the question what is the Delaying task is ? Thanks in advance Valerie

maybe delayed is a task that is blocked because it called vTaskDelay or vTaskDelayUntil, and blocked is a task that is blocked on a queue or semaphore. Experiment with it to see.

Yes, you are right – Delaying state appears when I call to vTaskDelay(), also I saw now that Suspended appears after vTaskSuspend. But now I don’t understand what is Blocked state. I don’t see queues. What you meen “blocked on a queue” ?

Hello Valerie, To see the status of Queues – that needs to be enabled in the FreeRTOS Config file(s) – as an example; a queue can block waiting on information to be sent to it – this is a pretty popular way to handle serial ISR RX routines. Once that is enabled you will see it in the IAR debugger – of course you need to be using a queue in a task. HTH, John W.

Hi John W. I use Queues for IPC ( to trransfer messages from task to task ). But I don’t really understand, if I have task, that it’s main loop include for(;;) { if(mIpcQ->Receive(&message, mblockTime)) { DoSomething(); } } if It mentioned blocked on Queue, and in IAR I see BLOCKED ? Thanks a lot. Valerie

Hello Valerie, What do you see if you put a breakpoint on DoSomething();? Regards, John W.

If breakpoint on DoSomething() and I stoped there, so this Task on RUNNING state

One more question about task states: I use xEventGroupSetBits(), If it set the task to BLOCKED state ?

All the FreeRTOS objects (queues, event groups, etc.) use the same Blocking mechanism, so the plug-in will not be able to tell how a Blocked task got into the Blocked state, and just report the task as being Blocked. The plug-in can tell the difference between a task that is blocked on an object and a task not is blocked just to delay for a fixed period though. Finding the answer to your questions by experimentation is quite easy – just call the xEventQueueWaitBits() function, then view the task in the plug-in to see what state is reported.

Tank you very much.