Re: [Xenomai-help] xn_pipe_create [minor]

[Philippe Gerum <rpm@xenomai.org>]

Dmitry Adamushko wrote:
> On Monday 14 November 2005 18:38, Philippe Gerum wrote:
> 
>>xenomai@xenomai.org
> 
> 
>>>If you want to have some fun (and you have some time and desire for 
>>>that) then go ahead :) Otherwise, no problem, I'll do that.
>>>
>>
>>Please make sure to implement this at the nucleus level, and if using a 
>>bitmap to locate free/busy slots, it should be large enough to handle 
>>FDSETSIZE  channels, not BITS_PER_LONG.
> 
> 
> We have xnpipe_states[XNPIPE_DEVS] array of pipe objects. Choosing a minor 
> value is about choosing a free slot (minor == id of that slot) so there are 
> XNPIPE_DEVS possible values. The bitmap must contain at least XNPIPE_DEVS 
> bits. I don't understand what FDSETSIZE has to do here (if you mean the one 
> that is used to configure select() behaviour).

The point is about not being limited to the number of bits in a long, because I 
know of configurations with more than 32 active channels. IOW,
#define XNPIPE_DEVS FDSETSIZE should be possible.

> 
> 
>>-- 
>>
>>Philippe.
> 
> 
> ---
> 
> Dmitry
> 


-- 

Philippe.