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diff --git a/include/rtems/posix/key.h b/include/rtems/posix/key.h
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+/**
+ * @file
+ *
+ * @brief POSIX Key Private Support
+ *
+ * This include file contains all the private support information for
+ * POSIX key.
+ */
+
+/*
+ * Copyright (c) 2012 Zhongwei Yao.
+ * COPYRIGHT (c) 1989-2011.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _RTEMS_POSIX_KEY_H
+#define _RTEMS_POSIX_KEY_H
+
+#include <pthread.h>
+
+#include <rtems/score/chain.h>
+#include <rtems/score/object.h>
+#include <rtems/score/rbtree.h>
+#include <rtems/score/thread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup POSIX_KEY POSIX Key
+ *
+ * @ingroup POSIXAPI
+ *
+ */
+/**@{**/
+
+/**
+ * @brief Represents POSIX key and value pair.
+ */
+typedef struct {
+  /**
+   * @brief The chain node for the per-thread value chain.
+   */
+  Chain_Node Key_values_per_thread_node;
+
+  /**
+   * @brief The tree node for the lookup tree.
+   */
+  RBTree_Node Key_value_lookup_node;
+
+  /**
+   * @brief The POSIX key identifier used in combination with the thread
+   * pointer as the tree key.
+   */
+  pthread_key_t key;
+
+  /**
+   * @brief The thread pointer used in combination with the POSIX key
+   * identifier as the tree key.
+   */
+  Thread_Control *thread;
+
+  /**
+   * @brief The thread specific POSIX key value.
+   */
+  void *value;
+} POSIX_Keys_Key_value_pair;
+
+/**
+ * @brief The data structure used to manage a POSIX key.
+ */
+typedef struct {
+   /** This field is the Object control structure. */
+   Objects_Control     Object;
+   /** This field is the data destructor. */
+   void (*destructor) (void *);
+ }  POSIX_Keys_Control;
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/*  end of include file */