NCS sem_take hangs

[Mary]

NCS version 1.9.1

nRF52840 DK

I have a task that waits on a semaphore with a timeout.  Sometimes the task gets stuck in the k_sem_take() call, even though there is a timeout.  Even giving the semaphore fails to make the k_sem_take() call return.

Is this a bug? Is there a workaround?  The whole point of the time out is for the while(1) loop body to execute at least periodically.

// Semaphores
struct k_sem sem_mysem;

void main(void)
{

	k_sem_init(&sem_mysem, 0, 10);		
	
	tid_mytask = k_thread_create(&kthread_data, stack_mytask, K_THREAD_STACK_SIZEOF(stack_mytask), my_task, NULL, NULL, NULL, KTHREAD_MYTASK_PRIORITY, 0, K_NO_WAIT);


}

void my_task( void *p1, void *p2, void *p3)
{
    // Initialize some stuff
    
	while (1)
	{
		// Wait 200 msec, or semaphore give from another task
		k_sem_take(&sem_mysem, K_MSEC(200));
		
		// do some stuff
    }
    
}

Thanks,

Mary

[Einar Thorsrud]

Hi Mary,

I am not aware of any such issues, nor have I been able to reproduce. I suspect that the issue you are seeing could be in some part of your code that you have stripped away in the minimal code you posted. Can you post a complete minimal failing example that I can build and run on my end that reproduces the issue?

Einar