+ else
+ segment_manager_segment_reader_unlock (sm);
+}
+
+int
+segment_manager_grow_fifo (segment_manager_t * sm, svm_fifo_t * f, u32 size)
+{
+ fifo_segment_t *fs;
+ int rv;
+
+ fs = segment_manager_get_segment_w_lock (sm, f->segment_index);
+ rv = fifo_segment_grow_fifo (fs, f, size);
+ segment_manager_segment_reader_unlock (sm);
+
+ return rv;
+}
+
+int
+segment_manager_collect_fifo_chunks (segment_manager_t * sm, svm_fifo_t * f)
+{
+ fifo_segment_t *fs;
+ int rv;
+
+ fs = segment_manager_get_segment_w_lock (sm, f->segment_index);
+ rv = fifo_segment_collect_fifo_chunks (fs, f);
+ segment_manager_segment_reader_unlock (sm);
+
+ return rv;
+}
+
+int
+segment_manager_shrink_fifo (segment_manager_t * sm, svm_fifo_t * f, u32 size,
+ u8 is_producer)
+{
+ int rv;
+
+ rv = svm_fifo_reduce_size (f, size, is_producer);
+
+ /* Nothing to collect at this point */
+ if (!is_producer)
+ return rv;
+
+ if (f->flags & SVM_FIFO_F_COLLECT_CHUNKS)
+ segment_manager_collect_fifo_chunks (sm, f);
+
+ return rv;
+}
+
+u32
+segment_manager_evt_q_expected_size (u32 q_len)
+{
+ u32 fifo_evt_size, notif_q_size, q_hdrs;
+ u32 msg_q_sz, fifo_evt_ring_sz, session_ntf_ring_sz;
+
+ fifo_evt_size = 1 << max_log2 (sizeof (session_event_t));
+ notif_q_size = clib_max (16, q_len >> 4);
+
+ msg_q_sz = q_len * sizeof (svm_msg_q_msg_t);
+ fifo_evt_ring_sz = q_len * fifo_evt_size;
+ session_ntf_ring_sz = notif_q_size * 256;
+ q_hdrs = sizeof (svm_queue_t) + sizeof (svm_msg_q_t);
+
+ return (msg_q_sz + fifo_evt_ring_sz + session_ntf_ring_sz + q_hdrs);