How to tell if a particular task is created ?

roujesky wrote on Thursday, July 21, 2011:

In taskA I would like to know if taskB is created.  taskB is a one-shot task (runs and deletes itself).   If it is not running, taskA will create the task.
Is there a  function call that delivers this information?


sven-de wrote on Thursday, July 21, 2011:

To my knowledge there’s no specific function for that purpose. But since this is just another case of intertask-communication you could use queues, semaphores or shared memory. Just have a global variable that’s set and cleared by task B upon creation and deletion and checked by Task A.

Have you considered suspending task B instead of deleting it - that should have much better performance.

davedoors wrote on Friday, July 22, 2011:

Or if the task never enters the blocked state, replacing it with a software timer.

roujesky wrote on Friday, July 22, 2011:

didn’t think about the suspend idea, hmmmm……   I think that is a great idea!   I was using a global variable.   this seems much cleaner.


rtel wrote on Friday, July 22, 2011:

…if another tasks still needs to know its state, you can then use the xTaskIsTaskSuspended( xTaskHandle xTask ) API function.