+int
+svm_msg_q_wait_prod (svm_msg_q_t *mq)
+{
+ if (mq->q.evtfd == -1)
+ {
+ while (svm_msg_q_is_full (mq))
+ pthread_cond_wait (&mq->q.shr->condvar, &mq->q.shr->mutex);
+ }
+ else
+ {
+ u64 buf;
+ int rv;
+
+ while (svm_msg_q_is_full (mq))
+ {
+ while ((rv = read (mq->q.evtfd, &buf, sizeof (buf))) < 0)
+ {
+ if (errno != EAGAIN)
+ {
+ clib_unix_warning ("read error");
+ return rv;
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+int
+svm_msg_q_or_ring_wait_prod (svm_msg_q_t *mq, u32 ring_index)
+{
+ if (mq->q.evtfd == -1)
+ {
+ while (svm_msg_q_or_ring_is_full (mq, ring_index))
+ pthread_cond_wait (&mq->q.shr->condvar, &mq->q.shr->mutex);
+ }
+ else
+ {
+ u64 buf;
+ int rv;
+
+ while (svm_msg_q_or_ring_is_full (mq, ring_index))
+ {
+ while ((rv = read (mq->q.evtfd, &buf, sizeof (buf))) < 0)
+ {
+ if (errno != EAGAIN)
+ {
+ clib_unix_warning ("read error");
+ return rv;
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+