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diff --git a/nuttx/sched/pthread_keycreate.c b/nuttx/sched/pthread_keycreate.c
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+++ b/nuttx/sched/pthread_keycreate.c
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+/****************************************************************************
+ * sched/pthread_keycreate.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 <sched.h>
+#include <errno.h>
+#include <debug.h>
+
+#include "pthread_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pthread_key_create
+ *
+ * Description:
+ *   This function creates a thread-specific data key visible to all threads
+ *   in the system.  Although the same key value may be used by different
+ *   threads, the values bound to the key by pthread_setspecific() are
+ *   maintained on a per-thread basis and persist for the life of the calling
+ *   thread.
+ *
+ *   Upon key creation, the value NULL will be associated with the new key
+ *   in all active threads.  Upon thread creation, the value NULL will be
+ *   associated with all defined keys in the new thread.
+ *
+ * Parameters:
+ *   key = A pointer to the key to create.
+ *   destructor = An optional destructor() function that may be associated
+ *      with each key that is invoked when a thread exits.  However, this
+ *      argument is ignored in the current implementation.
+ *
+ * Return Value:
+ *   If successful, the pthread_key_create() function will store the newly
+ *   created key value at *key and return zero (OK).  Otherwise, an error
+ *   number will bereturned to indicate the error:
+ *
+ *      EAGAIN - The system lacked sufficient resources to create another
+ *         thread-specific data key, or the system-imposed limit on the total
+ *         number of keys pers process {PTHREAD_KEYS_MAX} has been exceeded
+ *      ENONMEM - Insufficient memory exists to create the key.
+ *
+ * Assumptions:
+ *
+ * POSIX Compatibility:
+ *   - The present implementation ignores the destructor argument.
+ *
+ ****************************************************************************/
+
+int pthread_key_create(FAR pthread_key_t *key, CODE void (*destructor)(void*))
+{
+#if CONFIG_NPTHREAD_KEYS > 0
+  int ret = EAGAIN;
+
+  /* Check if we have exceeded the system-defined number of keys. */
+
+  if (g_pthread_num_keys < PTHREAD_KEYS_MAX)
+    {
+      /* Return the key value */
+
+      *key = g_pthread_num_keys;
+
+      /* Increment the count of global keys. */
+
+      g_pthread_num_keys++;
+
+      /* Return success. */
+
+      ret = OK;
+    }
+
+  return ret;
+#else
+  return ENOSYS;
+#endif
+}