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diff --git a/vlib-api/vlibmemory/unix_shared_memory_queue.h b/vlib-api/vlibmemory/unix_shared_memory_queue.h
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+/*
+ *------------------------------------------------------------------
+ * unix_shared_memory_queue.h - shared-memory queues
+ *
+ * Copyright (c) 2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#ifndef included_unix_shared_memory_queue_h
+#define included_unix_shared_memory_queue_h
+
+#include <pthread.h>
+#include <vppinfra/mem.h>
+
+typedef struct _unix_shared_memory_queue {
+ pthread_mutex_t mutex; /* 8 bytes */
+ pthread_cond_t condvar; /* 8 bytes */
+ int head;
+ int tail;
+ int cursize;
+ int maxsize;
+ int elsize;
+ int consumer_pid;
+ int signal_when_queue_non_empty;
+ char data[0];
+} unix_shared_memory_queue_t;
+
+unix_shared_memory_queue_t *
+unix_shared_memory_queue_init(int nels,
+ int elsize,
+ int consumer_pid,
+ int signal_when_queue_non_empty);
+void unix_shared_memory_queue_free(unix_shared_memory_queue_t *q);
+int unix_shared_memory_queue_add (unix_shared_memory_queue_t *q,
+ u8 *elem, int nowait);
+int unix_shared_memory_queue_sub(unix_shared_memory_queue_t *q,
+ u8 *elem, int nowait);
+void unix_shared_memory_queue_lock (unix_shared_memory_queue_t *q);
+void unix_shared_memory_queue_unlock (unix_shared_memory_queue_t *q);
+int unix_shared_memory_queue_is_full (unix_shared_memory_queue_t *q);
+int unix_shared_memory_queue_add_nolock (unix_shared_memory_queue_t *q,
+ u8 *elem);
+
+int unix_shared_memory_queue_sub_raw (unix_shared_memory_queue_t *q,
+ u8 *elem);
+int unix_shared_memory_queue_add_raw (unix_shared_memory_queue_t *q,
+ u8 *elem);
+
+#endif /* included_unix_shared_memory_queue_h */