topic What is needed to create thread safe queues? in MQX Software Solutions

What is needed to create thread safe queues?

daviduhen — Mon, 03 Jun 2013 01:20:30 GMT

Are MQX queues thread safe? If so, what is the mechanism used? If not, can anyone share their code for thread safe queues or linked lists?

Re: What is needed to create thread safe queues?

c0170 — Mon, 03 Jun 2013 05:43:50 GMT

Hello David Uhen,

MQX queues are thread safe, here's a code snippet from queue code file inside source/kernel folder.

boolean _queue_enqueue
(
    QUEUE_STRUCT_PTR         q_ptr,
    QUEUE_ELEMENT_STRUCT_PTR e_ptr
)
{ /* Body */

    _int_disable();
    if ((q_ptr->MAX != 0) && (q_ptr->SIZE >= q_ptr->MAX))
    {
        _int_enable();
        return (FALSE);
    } /* Endif */

    _QUEUE_ENQUEUE(q_ptr, e_ptr);
   _int_enable();
    return (TRUE);

} /* Endbody */

When a queue is being handled, interrupts are disabled. I don't have any example available, perhaps others will share.

Check reference manual, there are only few functions defined, therefore it should be trivial to use.

Regards,

c0170

Re: What is needed to create thread safe queues?

Monica — Thu, 20 Jun 2013 23:16:10 GMT

Hello David,

just checking up how is this matter going, did this workaround work?

Please let us know :smileywink:

Best regards,

Monica