On Wed, 2007-09-05 at 16:18 +0200, rtos wrote:
> Hello
> I am new in Xenomai and I can't figure out from examples what is the best way
> to send some data from kernel space rt_task to user space rt_task. I have
> created both tasks. In the kernel space task I've created rt_queue and I
> would like bind to it from the user space kernel task but all I've got is
> -EPERM?? I cannot figure out why it happens?
> best regards
> Marcin Piatek
[snip]
> */
> static int base_address_init(void) {
> int err;
>
> if ((err = pci_register_driver(&pci_driver)))
> return err;
>
> if ((err = rt_queue_create(&my_queue, "MyQueue", sizeof(int)*1000, 1000,
> Q_FIFO))) {
- if ((err = rt_queue_create(&my_queue, "MyQueue", sizeof(int)*1000, 1000,
Q_FIFO)))
+ if ((err = rt_queue_create(&my_queue, "MyQueue", sizeof(int)*2000, 1000,
Q_FIFO|Q_SHARED)))
You need to define a shared queue in order to share the memory pool
between kernel and userland. The pool size should also be raised a bit
since there is a minimum value in this case.
$ cat /proc/xenomai/registry/native/queues/MyQueue
to find more about the object you have just created.
In the former case, the queue type was defined as "local", which is not
what you want.
--
Philippe.
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