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diff --git a/nuttx/sched/timer_internal.h b/nuttx/sched/timer_internal.h
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+/********************************************************************************
+ * timer_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_TIMER_INTERNAL_H
+#define __SCHED_TIMER_INTERNAL_H
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <wdog.h>
+
+#include <nuttx/compiler.h>
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+#define PT_FLAGS_PREALLOCATED 0x01 /* Timer comes from a pool of preallocated timers */
+
+/********************************************************************************
+ * Public Types
+ ********************************************************************************/
+
+/* This structure represents one POSIX timer */
+
+struct posix_timer_s
+{
+  FAR struct posix_timer_s *flink;
+
+  uint8_t         pt_flags;        /* See PT_FLAGS_* definitions */
+  uint8_t         pt_crefs;        /* Reference count */
+  uint8_t         pt_signo;        /* Notification signal */
+  pid_t           pt_owner;        /* Creator of timer */
+  int             pt_delay;        /* If non-zero, used to reset repetitive timers */
+  int             pt_last;         /* Last value used to set watchdog */
+  WDOG_ID         pt_wdog;         /* The watchdog that provides the timing */
+  union sigval    pt_value;        /* Data passed with notification */
+};
+
+/********************************************************************************
+ * Public Data
+ ********************************************************************************/
+
+/* This is a list of free, preallocated timer structures */
+
+#if CONFIG_PREALLOC_TIMERS > 0
+extern volatile sq_queue_t g_freetimers;
+#endif
+
+/* This is a list of instantiated timer structures -- active and inactive.  The
+ * timers are place on this list by timer_create() and removed from the list by
+ * timer_delete() or when the owning thread exits.
+ */
+
+extern volatile sq_queue_t g_alloctimers;
+
+/********************************************************************************
+ * Public Function Prototypes
+ ********************************************************************************/
+
+void weak_function timer_initialize(void);
+void weak_function timer_deleteall(pid_t pid);
+int  timer_release(FAR struct posix_timer_s *timer);
+
+#endif /* __SCHED_TIMER_INTERNAL_H */