Re: Resources for Linux SocketCAN

Hello Dinesh,

Am Freitag 01 Februar 2013, 12:12:07 schrieben Sie:
> Hi,
> 
> Suppose there is 20 different messages in the common tx queues for a device
> from suppose 4 processes.
> My question is does SocketCAN & CAN4Linux supports message priority based
> transmission, or it is just FIFO.
can4linux has only one TX Fifo (yet).
There was no need to having priority based queues.
It should not be to difficult to add such a feature.
A bit more difficult would be to stop transmission of a low priority frame
and schedule a higher prior one for transmission. 

I can not speak for SocketCAN, but think they have plans for it.

> 
> >> Each receiving process needs its on receive queue for example and memory
> for it. To mange this, at compile time yo define
> -DCAN_MAX_OPEN=4 in the Makefile to allow, in this example, four processes
> to open one physical device at the same time.
> Queue size too is a compile time constant.

This is correct. We prefer this static assign of resources.
> 
> [skip more ...]

Regards
  Heinz
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