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diff --git a/nuttx/sched/pg_internal.h b/nuttx/sched/pg_internal.h
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+/****************************************************************************
+ * sched/pg_internal.h
+ *
+ *   Copyright (C) 2010 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_PG_INTERNAL_H
+#define __SCHED_PG_INTERNAL_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+ 
+#include <nuttx/config.h>
+#include <queue.h>
+
+#ifdef CONFIG_PAGING
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+/* Supply reasonable (but probably non-optimal) default settings if
+ * configuration items are omitted.
+ */
+
+#ifndef CONFIG_PAGING_DEFPRIO
+#  define CONFIG_PAGING_DEFPRIO 50
+#endif
+
+#ifndef CONFIG_PAGING_WORKPERIOD
+#  define CONFIG_PAGING_WORKPERIOD (500*1000) /* 1/2 second */
+#endif
+
+#ifndef CONFIG_PAGING_STACKSIZE
+#  define CONFIG_PAGING_STACKSIZE  CONFIG_IDLETHREAD_STACKSIZE
+#endif
+
+#ifdef CONFIG_DISABLE_SIGNALS
+#  warning "Page fill support requires signals"
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY
+
+/* This is the task IDof the page fill worker thread.  This value was set in
+ * os_start when the page fill worker thread was started.
+ */
+
+extern pid_t g_pgworker;
+
+/* The page fill worker thread maintains a static variable called g_pftcb.
+ * If no page fill is in progress, g_pftcb will be NULL. Otherwise, g_pftcb
+ * will point to the TCB of the task which is receiving the fill that is
+ * in progess.
+ *
+ * NOTE: I think that this is the only state in which a TCB does not reside
+ * in some list.  Here is it in limbo, outside of the normally queuing while
+ * the page file is in progress.  Where here, it will be marked with
+ * TSTATE_TASK_INVALID.
+ */
+
+extern FAR _TCB *g_pftcb;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pg_worker
+ *
+ * Description:
+ *   This is the entry point of the worker thread that performs the actual
+ *   page file.
+ *
+ * Input parameters:
+ *   argc, argv (not used)
+ *
+ * Returned Value:
+ *   Does not return
+ *
+ ****************************************************************************/
+
+int pg_worker(int argc, char *argv[]);
+
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_PAGING */
+#endif /* __SCHED_PG_INTERNAL_H */