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diff --git a/nuttx/sched/pthread_setspecific.c b/nuttx/sched/pthread_setspecific.c
new file mode 100644
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+++ b/nuttx/sched/pthread_setspecific.c
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+/****************************************************************************
+ * sched/pthread_setspecific.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 "os_internal.h"
+#include "pthread_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pthread_setspecific
+ *
+ * Description:
+ *   The pthread_setspecific() function associates a thread-
+ *   specific value with a key obtained via a previous call
+ *   to pthread_key_create().  Different threads may bind
+ *   different values to the same key.  These values are
+ *   typically pointers to blocks of dynamically allocated
+ *   memory that have been reserved for use by the calling
+ *   thread.
+ *
+ *   The effect of calling pthread_setspecific() with
+ *   with a key value not obtained from pthread_create() or
+ *   after a key has been deleted with pthread_key_delete()
+ *   is undefined.
+ *
+ * Parameters:
+ *   key = The data key to get or set
+ *   value = The value to bind to the key.
+ *
+ * Return Value:
+ *   If successful, pthread_setspecific() will return zero (OK).
+ *   Otherwise, an error number will be returned:
+ *
+ *      ENOMEM - Insufficient memory exists to associate
+ *         the value with the key.
+ *      EINVAL - The key value is invalid.
+ *
+ * Assumptions:
+ *
+ * POSIX Compatibility:
+ *   int pthread_setspecific(pthread_key_t key, void *value)
+ *   void *pthread_getspecific(pthread_key_t key)
+ *
+ *   - Both calling pthread_setspecific() and pthread_getspecific()
+ *     may be called from a thread-specific data destructor
+ *     function.
+ *
+ ****************************************************************************/
+
+int pthread_setspecific(pthread_key_t key, FAR void *value)
+{
+#if CONFIG_NPTHREAD_KEYS > 0
+  FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head;
+  int ret = EINVAL;
+
+  /* Check if the key is valid. */
+
+  if (key < g_pthread_num_keys)
+    {
+      /* Store the data in the TCB. */
+
+      rtcb->pthread_data[key] = value;
+
+      /* Return success. */
+
+      ret = OK;
+    }
+
+  return ret;
+#else
+  return ENOSYS;
+#endif
+}
+