+static inline void
+segment_manager_lock_and_del_segment (segment_manager_t * sm, u32 fs_index)
+{
+ svm_fifo_segment_private_t *fs;
+ u8 is_prealloc;
+
+ clib_rwlock_writer_lock (&sm->segments_rwlock);
+ fs = segment_manager_get_segment (sm, fs_index);
+ is_prealloc = svm_fifo_segment_flags (fs) & FIFO_SEGMENT_F_IS_PREALLOCATED;
+ if (is_prealloc && !segment_manager_app_detached (sm))
+ {
+ clib_rwlock_writer_unlock (&sm->segments_rwlock);
+ return;
+ }
+
+ segment_manager_del_segment (sm, fs);
+ clib_rwlock_writer_unlock (&sm->segments_rwlock);
+}
+
+/**
+ * Reads a segment from the segment manager's pool without lock
+ */
+svm_fifo_segment_private_t *
+segment_manager_get_segment (segment_manager_t * sm, u32 segment_index)
+{
+ return pool_elt_at_index (sm->segments, segment_index);
+}
+
+/**
+ * Reads a segment from the segment manager's pool and acquires reader lock
+ *
+ * Caller must drop the reader's lock by calling
+ * @ref segment_manager_segment_reader_unlock once it finishes working with
+ * the segment.
+ */
+svm_fifo_segment_private_t *
+segment_manager_get_segment_w_lock (segment_manager_t * sm, u32 segment_index)
+{
+ clib_rwlock_reader_lock (&sm->segments_rwlock);
+ return pool_elt_at_index (sm->segments, segment_index);
+}
+
+void
+segment_manager_segment_reader_unlock (segment_manager_t * sm)
+{
+ ASSERT (sm->segments_rwlock->n_readers > 0);
+ clib_rwlock_reader_unlock (&sm->segments_rwlock);
+}