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diff --git a/nuttx/sched/wd_internal.h b/nuttx/sched/wd_internal.h
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+/************************************************************************
+ * sched/d_internal.h
+ *
+ *   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.
+ *
+ ************************************************************************/
+
+#ifndef __SCHED_WD_INTERNAL_H
+#define __SCHED_WD_INTERNAL_H
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <wdog.h>
+
+#include <nuttx/compiler.h>
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Type Declarations
+ ************************************************************************/
+
+/* This is the watchdog structure.  The WDOG_ID is a pointer to a
+ * watchdog structure.
+ */
+
+struct wdog_s
+{
+  FAR struct wdog_s *next;       /* Support for singly linked lists. */
+  wdentry_t          func;       /* Function to execute when delay expires */
+#ifdef CONFIG_PIC
+  FAR void          *picbase;    /* PIC base address */
+#endif
+  int                lag;        /* Timer associated with the delay */
+  bool               active;     /* true if the watchdog is actively timing */
+  uint8_t            argc;       /* The number of parameters to pass */
+  uint32_t           parm[CONFIG_MAX_WDOGPARMS];
+};
+typedef struct wdog_s wdog_t;
+
+/************************************************************************
+ * Public Variables
+ ************************************************************************/
+
+/* The g_wdfreelist data structure is a singly linked list of watchdogs
+ * available to the system for delayed function use.
+ */
+
+extern sq_queue_t g_wdfreelist;
+
+/* g_wdpool is a pointer to a list of pre-allocated watchdogs. The number
+ * of watchdogs in the pool is a configuration item.
+ */
+
+extern FAR wdog_t *g_wdpool;
+
+/* The g_wdactivelist data structure is a singly linked list ordered by
+ * watchdog expiration time. When watchdog timers expire,the functions on
+ * this linked list are removed and the function is called.
+ */
+
+extern sq_queue_t g_wdactivelist;
+
+/************************************************************************
+ * Public Function Prototypes
+ ************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+EXTERN void weak_function wd_initialize(void);
+EXTERN void weak_function wd_timer(void);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SCHED_WD_INTERNAL_H */