On 07/07/2011 09:31 AM, Richard Cochran wrote:
On Wed, Jul 06, 2011 at 02:19:47PM +0200, Gilles Chanteperdrix wrote:
On 07/06/2011 01:42 PM, Andrey Nechypurenko wrote:
What makes me worry here is the IPC abbreviation - I have just one
process with multiple threads. So would not real IPC mechanism be the
overkill in this scenario? Or am I just misinterpret what IPC means
here?
...
I am talking about the ring buffer thing with head and tail pointers
where each thread (consumer, producer), moves only one pointer. I would
call this a "lockless fifo", though I do not know what the official name
is, but you get the idea. Again, you can send pointers through an IPC
instead of sending the data themselves, and you will benefit from the
fact that the two threads are running in the same memory space.
In Andrey's case, I would simply use a ring buffer (fifo) shared
between one RT and one non-RT thread. No locking is needed, and it is
easy to implement. You don't need a library for that.
If you want to do lockless passing of data, make sure that you have read
and understood linux/Documentation/memory-barriers.txt
/Anders
--
Anders Blomdell Email: [email protected]
Department of Automatic Control
Lund University Phone: +46 46 222 4625
P.O. Box 118 Fax: +46 46 138118
SE-221 00 Lund, Sweden
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