void consumer (void *cookie)
{
ssize_t len;
void *msg;
int err;
/* Bind to a queue which has been created elsewhere, either in
kernel or user-space. The call will block us until such queue
is created with the expected name. The queue should have been
created with the Q_SHARED mode set, which is implicit when
creation takes place in user-space. */
err = rt_queue_bind(&q_desc,"SomeQueueName",TM_INFINITE);
if (err)
fail();
/* Collect each message sent to the queue by the queuer() routine,
until the queue is eventually removed from the system by a call
to rt_queue_delete(). */
while ((len = rt_queue_receive(&q_desc,&msg,TM_INFINITE)) > 0)
{
printf("received message> len=%d bytes, ptr=%p, s=%s\n",
len,msg,(const char *)msg);
rt_queue_free(&q_desc,msg);
}
/* We need to unbind explicitly from the queue in order to
properly release the underlying memory mapping. Exiting the
process unbinds all mappings automatically. */
rt_queue_unbind(&q_desc);
if (len != -EIDRM)
/* We received some unexpected error notification. */
fail();
/* ... */
}
void display(void *cookie)
{
RT_QUEUE q;
int n = 0;
time_t start;
struct smpl_t { long minjitter, avgjitter, maxjitter, overrun; } *smpl;
rt_queue_bind(&q, "queue");
time(&start);
while (!finished) {
smpl = NULL;
rt_queue_recv(&q, (void *)&smpl, TM_INFINITE);
if (smpl == NULL) continue;
if (data_lines && (n++%data_lines) == 0) {
time_t now, dt;
time(&now);
dt = now - start;
printf("rth|%12s|%12s|%12s|%8s| %.2ld:%.2ld:%.2ld\n", "lat min", "lat avg", "lat max", "overrun", dt/3600, (dt/60)%60, dt%60 + 1);
}
printf("rtd|%12ld|%12ld|%12ld|%8ld\n", smpl->minjitter, smpl->avgjitter, smpl->maxjitter, smpl->overrun);
rt_queue_free(&q, smpl);
}
rt_queue_unbind(&q);
}
