Getting Started with QNX Neutrino - QNX Software Systems

© 2009, QNX Software Systems GmbH & Co. KG. time1.c
}
// set up the kind of event that we want to deliver -- a pulse
SIGEV_PULSE_INIT (&event, coid, SIGEV_PULSE_PRIO_INHERIT, CODE_TIMER, 0);
// create the timer, binding it to the event
if (timer_create (CLOCK_REALTIME, &event, &timerid) == -1) {
fprintf (stderr, "%s: couldn’t create a timer, errno %d\n",
progname, errno);
perror (NULL);
exit (EXIT_FAILURE);
}
// setup the timer (1s delay, 1s reload)
timer.it_value.tv_sec = 1;
timer.it_value.tv_nsec = 0;
timer.it_interval.tv_sec = 1;
timer.it_interval.tv_nsec = 0;
}
// and start it!
timer_settime (timerid, 0, &timer, NULL);
/*
* gotAPulse
*
* This routine is responsible for handling the fact that a timeout
* has occurred. It runs through the list of clients to see
* which client has timed-out, and replies to it with a timed-out
* response.
*/
void
gotAPulse (void)
{
ClientMessageT msg;
int i;
if (debug) {
time_t now;
}
time (&now);
printf ("Got a Pulse at %s", ctime (&now));
// prepare a response message
msg.messageType = MT_TIMEDOUT;
// walk down list of clients
for (i = 0; i < MAX_CLIENT; i++) {
// is this entry in use?
if (clients [i].in_use) {
// is it about to time out?
if (--clients [i].timeout == 0) {
// send a reply
MsgReply (clients [i].rcvid, EOK, &msg, sizeof (msg));
}
// entry no longer used
clients [i].in_use = 0;
April 30, 2009 Appendix: C • Sample Programs 319