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diff --git a/cpukit/rtems/src/taskwakewhen.c b/cpukit/rtems/src/taskwakewhen.c
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+/*
+ * RTEMS Task Manager
+ *
+ *
+ * COPYRIGHT (c) 1989-1998.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#include <rtems/system.h>
+#include <rtems/rtems/status.h>
+#include <rtems/rtems/support.h>
+#include <rtems/rtems/modes.h>
+#include <rtems/score/object.h>
+#include <rtems/score/stack.h>
+#include <rtems/score/states.h>
+#include <rtems/rtems/tasks.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+#include <rtems/score/tod.h>
+#include <rtems/score/userext.h>
+#include <rtems/score/wkspace.h>
+#include <rtems/score/apiext.h>
+#include <rtems/score/sysstate.h>
+
+/*PAGE
+ *
+ * rtems_task_wake_when
+ *
+ * This directive blocks the requesting thread until the given date and
+ * time is reached.
+ *
+ * Input parameters:
+ * time_buffer - pointer to the time and date structure
+ *
+ * Output parameters:
+ * RTEMS_SUCCESSFUL - if successful
+ * error code - if unsuccessful
+ */
+
+rtems_status_code rtems_task_wake_when(
+rtems_time_of_day *time_buffer
+)
+{
+ Watchdog_Interval seconds;
+
+ if ( !_TOD_Is_set )
+ return RTEMS_NOT_DEFINED;
+
+ time_buffer->ticks = 0;
+
+ if ( !_TOD_Validate( time_buffer ) )
+ return RTEMS_INVALID_CLOCK;
+
+ seconds = _TOD_To_seconds( time_buffer );
+
+ if ( seconds <= _TOD_Seconds_since_epoch )
+ return RTEMS_INVALID_CLOCK;
+
+ _Thread_Disable_dispatch();
+ _Thread_Set_state( _Thread_Executing, STATES_WAITING_FOR_TIME );
+ _Watchdog_Initialize(
+ &_Thread_Executing->Timer,
+ _Thread_Delay_ended,
+ _Thread_Executing->Object.id,
+ NULL
+ );
+ _Watchdog_Insert_seconds(
+ &_Thread_Executing->Timer,
+ seconds - _TOD_Seconds_since_epoch
+ );
+ _Thread_Enable_dispatch();
+ return RTEMS_SUCCESSFUL;
+}