Re: [Xenomai-core] realtime pipes

[Makarand Pradhan <makarandpradhan@domain.hid>]

Thanks.

On 16/01/12 10:24 AM, Philippe Gerum wrote:
> On 01/16/2012 04:09 PM, Makarand Pradhan wrote:
>> Thanks Philippe.
>>
>> To ensure that I understand correctly, let me rephrase my understanding.
>>
>> In 3.0, the rt_pipe_create and friends will cease to exist. We have to
>> start using the sockets with domain AF_RTIPC and protocol IPCPROTO_XDDP
>> instead.
>>
>> Is that a correct statement?
> Basically, yes. In addition, X3 will keep the RT_PIPE interface for the
> -rt endpoint available on the application-side, by wrapping a XDDP
> socket to a RT_PIPE descriptor under the hood. In kernel space however,
> the RT_PIPE API to create -rt endpoints won't be available anymore, one
> will have to create them via the rtdm_socket/rt_dev_socket calls.
>
> In any case, the API for the non-rt side does not change, i.e. POSIX
> file I/O calls will still be the way to interface with the -rt endpoint.
>
>> Rgds,
>> Mak.
>>
>> On 16/01/12 09:35 AM, Philippe Gerum wrote:
>>> On 01/16/2012 03:25 PM, Makarand Pradhan wrote:
>>>> Hi,
>>>>
>>>> "Real-time pipes are deprecated."
>>>>
>>>> We use a lot of rt pipes. So, can you pl elaborate on this? I would
>>>> highly appreciate if you can comment on the following.
>>>>
>>>> 1. When will the rt pipe interface be removed? Any time frame?
>>> Xenomai 3. Xenomai 2.x will keep them forever.
>>>
>>>> 2. Would like to understand the reason for deprecating the interface.
>>>>
>>> - Because there is a better socket-based API implemented by the RTIPC
>>> driver w/ the XDDP protocol, which does not require running application
>>> level code in kernel space (RT_PIPE is definitely an application level
>>> API). This new interface is available since Xenomai 2.5.x. It is
>>> functionally 100% equivalent to the legacy RT_PIPE API.
>>>
>>> - Because no support will be provided in Xenomai 3 for running
>>> application level code in kernel space, so RT_PIPE have to go from
>>> kernel space. However, RT_PIPE are still part of the user-space API of
>>> Xenomai 3, interfacing with XDDP endpoints in kernel space.
>>>
>>> I'm really referring to application level code, by contrast to RTDM
>>> driver level code which will obviously remain a first-class citizen in
>>> kernel space.
>>>
>>> See:
>>>
>>> o http://www.xenomai.org/index.php/Xenomai:Roadmap
>>>
>>> o
>>> http://www.xenomai.org/documentation/xenomai-2.6/html/api/group__rtipc.html
>>>
>>>
>>> o examples/rtdm/profiles/ipc in the Xenomai distro
>>>
>>>> Thanks and Rgds,
>>>> Mak.
>>>>
>>>>
>>>> On 15/01/12 12:37 PM, Gilles Chanteperdrix wrote:
>>>>> Real-time pipes are deprecated.
>>
>


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