Am Samstag, 17. Juni 2006 20:35 schrieb Gilles Chanteperdrix:
> Niklaus Giger wrote:
> > Am Samstag, 17. Juni 2006 19:53 schrieb Gilles Chanteperdrix:
> > > Niklaus Giger wrote:
> > > > Hi
> > > >
> > > > Here the reworked patch.
> > > >
> > > > vxWorks supports empty messages. Only one at a time can be
> > > > received.
> > >
> > > Could you explain a bit more "Only one at a time can be received" ? I
> > > do not get it. You mean that one message get lost if posting two null
> > > length messages while two receivers are blocked in a call to
> > > msgQReceive ?
> > I have two testcases for the 0 length messages. Look in my patch for
> > "Test mailbox with 0 length messages". They are:
> > a) Post two messages, then call twice msgQReceive and each time I get
> > one message back. Each time verified using msgQNumMsgs.
> > b) Post two messages, then try to receive two messages at once by giving
> > 2 (bytes) to msgQReceive see line:
> > rc = msgQReceive(qid,(char *)&msg,2,NO_WAIT);)
> > In this case I only get one message back, as msgQNumMsgs reports 1.
> > This explains the lines:
> > rc = msgQNumMsgs(qid);
> > TEST_ASSERT(rc == 1);
> The current implementation of message queues in vxworks skin does not
> support anything like "receive two messages at once". Are you sure
> vxworks does for non null messages ?
I am not sure. But will test sometimes next week.
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