Saiful Khan wrote:
> Hello,
>
> I observed some thing really surprised me-
> if i put a 10000 microsecond sleep between consecutive sendto() then
> it sends any no of packets packets continuously.
>
> while (test_time <=180000.0) //Test duration, In millisecond
> {
> bzero (buffer, 50);
> strcpy(buffer, "hello server - xenomai");
> n = sendto (sockfd, buffer, 50, 0, (struct sockaddr *) &serv_addr,
> (socklen_t) sizeof (serv_addr));
> usleep (10000);
> if ( n < 0 )
> {
> perror ("ERROR, Sending Failed....\n");
> exit (0);
> }
> }//end of while
>
> --but if i dont give the usleep(), it sends only 16 packets. More over
> if I use usleep(1000), then also after sending some messages the
> program exits giving "ERROR, Sending Failed.... No buffer space
> available".OK, a few things to note: - sendto is non-blocking, i.e. it tries to send immediately, queues messages that cannot be sent right now (TDMA...), fails if something goes wrong before enqueuing (routing, no more buffers, ...). - You are running RTmac/TDMA, likely with the default setup: 1 message slot per node each 5 ms. - You try to send messages at a higher rate, consuming your personal (per socket) transmission buffers faster than they can be released again (after the actual transmission). Thus, your system setup is broken. Either fix your application or the TDMA network configuration. - usleep is, according to POSIX spec, obsolescent. More problematic: it is not supported by Xenomai's POSIX skin, thus you are continuously leaving the RT context to sleep for an indeterministic period. Use [clock_]nanosleep instead. (That's just a footnote here, not the reason for the error message.) HTH, Jan
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