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diff --git a/nuttx/sched/mq_descreate.c b/nuttx/sched/mq_descreate.c
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+/****************************************************************************
+ * sched/mq_descreate.c
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+#include <assert.h>
+#include <mqueue.h>
+#include <sched.h>
+#include <queue.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/kmalloc.h>
+
+#include "os_internal.h"
+#include "sig_internal.h"
+
+#include "mq_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mq_desalloc
+ *
+ * Description:
+ *   Allocate a message queue descriptor.
+ *
+ * Inputs:
+ *   None
+ *
+ * Return Value:
+ *   Reference to the allocated mq descriptor.
+ *
+ ****************************************************************************/
+
+static mqd_t mq_desalloc(void)
+{
+  mqd_t mqdes;
+
+  /* Try to get the message descriptorfrom the free list */
+
+  mqdes = (mqd_t)sq_remfirst(&g_desfree);
+
+  /* Check if we got one. */
+
+  if (!mqdes)
+    {
+      /* Add another block of message descriptors to the list */
+
+      mq_desblockalloc();
+
+      /* And try again */
+
+      mqdes = (mqd_t)sq_remfirst(&g_desfree);
+    }
+
+  return mqdes;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mq_descreate
+ *
+ * Description:
+ *   Create a message queue descriptor for the specified TCB
+ *
+ * Inputs:
+ *   TCB - task that needs the descriptor.
+ *   msgq - Named message queue containing the message
+ *   oflags - access rights for the descriptor
+ *
+ * Return Value:
+ *   On success, the message queue descriptor is returned.  NULL is returned
+ *   on a failure to allocate.
+ *
+ ****************************************************************************/
+
+mqd_t mq_descreate(FAR _TCB* mtcb, FAR msgq_t* msgq, int oflags)
+{
+  mqd_t mqdes;
+
+  /* Create a message queue descriptor for the TCB */
+
+  mqdes = mq_desalloc();
+  if (mqdes)
+    {
+      /* Initialize the MQ descriptor */
+
+      memset(mqdes, 0, sizeof(struct mq_des));
+      mqdes->msgq   = msgq;
+      mqdes->oflags = oflags;
+
+      /* And add it to the specified tasks's TCB */
+
+      sq_addlast((FAR sq_entry_t*)mqdes, &mtcb->msgdesq);
+    }
+
+  return mqdes;
+}