On 07/26/2013 10:20 PM, Ricardo Amézquita wrote:
Thanks for the answer.
I'm using cython, so in a way I'm linked to the Xenomai libraries, and I
don’t know if this makes a difference. The python->xenomai messages are
working. Can I trust this?
Yes, because the send side does not request the sender to have Xenomai
capabilities for conveying a message. But the receive side does require
the caller to have Xenomai capabilities to fetch the message.
Also, I just found about buffers, should they
work?
Reading from a buffer would work, but only in non-blocking mode
(TM_NONBLOCK). We could do that for queues as well, the current
restriction is unneeded.
Or as you said previously, I should stick with pipes?
Pipes are nice when you really don't need/want to make your client
thread known to Xenomai, not depending on Xenomai libs in any way, but
only using plain character-based I/O to chat with a real-time side. If
this is not a strong requirement, or if you plan to extend your python
client with real-time services, then using rt_task_shadow() to promote
the caller to the Xenomai real would make sense.
Thanks again
2013/7/26 Philippe Gerum <[email protected]>
On 07/26/2013 09:28 PM, Ricardo Amézquita wrote:
Hello All
I'm writing a simple wrapper in python to be able to control some
real-time
processes. To communicate between the real-time process, and the python
process I'm using native queues. Sending messages from the python process
to the realtime process is working fine, but when I try to send a message
from the realtime process to the python process, I'm having problems.
Using
rt_queue inquire, I know that the message is in the queue, but the receive
function in the python side, never receives it.
Is there a limitation that apply to my application? I have tested with
pipes, and it works, but I want to implement everything using queues.
If your python process is not supposed to run Xenomai services at all,
i.e. mere Linux application not even linked with the Xenomai libraries,
then message pipes are definitely what you are looking for. Queues won't
work, since the python side won't be allowed to receive from a real-time
queue.
--
Philippe.
--
Philippe.
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