New interface to wait until the serial has flushed it buffer(s)

diff --git a/tos/interfaces/SerialFlush.nc b/tos/interfaces/SerialFlush.nc
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+//$Id$
+
+/* "Copyright (c) 2000-2005 The Regents of the University of California.  
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement
+ * is hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the autor appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY
+ * OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
+ */
+
+/**
+ * A basic interface to flush the serial port.
+ *
+ * @author Ben Greenstein
+ * @author Philip Levis
+ * @date January 23 2006
+ *
+ */
+
+interface SerialFlush {
+
+  /** 
+   * Request that the serial device signal when no more transmissions
+   * are pending (i.e., when the device is idle)
+   */
+  command void flush();
+
+  /** 
+   * Split phase event to indicate that the serial hardware is now idle.
+   */
+  event void flushDone();
+
+}
+