On Thu, 2007-06-07 at 14:13 -0500, NZG wrote:
> Further experimentations appear to show that the problem is that I'm closing
> the NRT pipe before data is received in the RT thread, this appears to cause
> the loss of data in the pipe.
>
> Is this the desired behavior?
Yes, clearly.
>
> NZG
>
>
> On Thursday 07 June 2007 1:57 pm, NZG wrote:
> > When writing from NRT to a real time pile (open, write, close).
> > Are message boundaries preserved based upon the length of the write call?
> >
> > It's not working for me. The code below returns success, but calling
> >
> > err = rt_pipe_read(comp,k,sizeof(kommand_t),TM_NONBLOCK);
> > or
> > err = rt_pipe_read(comp,k,sizeof(kommand_t),100);
> >
> > from RT space on the same pipe never returns any data
> >
> > err = rt_pipe_read(comp,k,sizeof(kommand_t),TM_NONBLOCK);
> > always returns err
> > 0x0b, Resource temporarily unavailable
> >
> > err = rt_pipe_read(comp,k,sizeof(kommand_t),100);
> > always returns err:
> > 0x6e, Connection timed out
> >
> > NZG
> >
> > code specifics follow...............
> >
> > int err;
> > kommand_t k = {
> > .type = KILLCYCLE,
> > };
> >
> > int cfd = open(COMMANDPIPE, O_WRONLY|O_SYNC);
> >
> > if(cfd<0){
> > printf("can't open %s (%s)\n",COMMANDPIPE, strerror(-cfd));
> > fflush(stdout);
> > return;
> > }
> >
> > printf("sizeof kommand_t = %u\n",sizeof(kommand_t));
> >
> > err=write(cfd,&k,sizeof(kommand_t));
> >
> > if(err>=0)printf("wrote %u bytes to %s\n",err,COMMANDPIPE);
> >
> > if(err<0)printf("err writing to %s (%s)\n",COMMANDPIPE,
> > strerror(errno));
> >
> >
> > if(close(cfd)<0)printf("couldn't close %s\n",COMMANDPIPE);
> >
> >
> >
> >
> > _______________________________________________
> > Xenomai-help mailing list
> > [email protected]
> > https://mail.gna.org/listinfo/xenomai-help
>
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--
Philippe.
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