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diff --git a/nuttx/sched/sched_removereadytorun.c b/nuttx/sched/sched_removereadytorun.c
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+/****************************************************************************
+ * shced/sched_removereadytorun.c
+ *
+ *   Copyright (C) 2007-2009, 2012 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 <stdbool.h>
+#include <queue.h>
+#include <assert.h>
+
+#include "os_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sched_removereadytorun
+ *
+ * Description:
+ *   This function removes a TCB from the ready to run list.
+ *
+ * Inputs:
+ *   rtcb - Points to the TCB that is ready-to-run
+ *
+ * Return Value:
+ *   true if the currently active task (the head of the 
+ *     g_readytorun list) has changed.
+ *
+ * Assumptions:
+ * - The caller has established a critical section before calling this
+ *   function (calling sched_lock() first is NOT a good idea -- use irqsave()).
+ * - The caller handles the condition that occurs if the
+ *   the head of the g_readytorun list is changed.
+ *
+ ****************************************************************************/
+
+bool sched_removereadytorun(FAR _TCB *rtcb)
+{
+  bool ret = false;
+
+  /* Check if the TCB to be removed is at the head of the ready to run list.
+   * In this case, we are removing the currently active task.
+   */
+
+  if (!rtcb->blink)
+    {
+      /* There must always be at least one task in the list (the idle task) */
+
+      ASSERT(rtcb->flink != NULL);
+
+      /* Inform the instrumentation layer that we are switching tasks */
+
+      sched_note_switch(rtcb, rtcb->flink);
+
+      rtcb->flink->task_state = TSTATE_TASK_RUNNING;
+      ret = true;
+    }
+
+  /* Remove the TCB from the ready-to-run list */
+
+  dq_rem((FAR dq_entry_t*)rtcb, (dq_queue_t*)&g_readytorun);
+
+  rtcb->task_state = TSTATE_TASK_INVALID;
+  return ret;
+}