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struct Message
{
    // This structure contains timer events.
    struct _pulse timerPulse;
};

void * tx_thread(void *arg)
{
int channelId
int userId = 0;
int receiveId;
struct sigevent event;
struct itimerspec itime;
timer_t timer_id;
Message msg;

// Create a channel
channelId = ChannelCreate(0);

// Set up the timer event parameters for the O/S. The timer will deliver
// the user id when it expires. You can change the userId if you have
// one thread handling multiple timers. If you have 1 timer per thread
// then leave it as 0.
SIGEV_PULSE_INIT(&event, ConnectAttach(ND_LOCAL_NODE, 0, channelId, _NTO_SIDE_CHANNEL, 0), SIGEV_PULSE_PRIO_INHERIT, 0, userId);
timer_create(CLOCK_REALTIME, &event, &timer_id);
 

itime.it_value.tv_sec = 0;
itime.it_value.tv_nsec = 250000000;
itime.it_interval.tv_sec = 0;
itime.it_interval.tv_nsec = 250000000;
timer_settime(timer_id, 0, &itime, NULL);

while (1)
{
// Wait till the timer expires.
if ((MsgReceive(channelId, &msg, sizeof(Message), NULL)) < 0)
{
    printf ("error\n");
}
else
{
    // We got our timer. In the case of multiple timers you have to check the
    // userId contained in msg.timerPulse to know which you got. If you are
    // receiving messages from  other threads there is a lot other code that
    // has to go here. If you are just getting a single timer this is all you
    // need.
    //STUFF DONE HERE
    //thread functionality removed since its irrelevant to timer & sleep
}
pthread_exit(NULL);
}