1 files changed, 77 insertions, 0 deletions
diff --git a/cpukit/score/src/coretodabsolutetimeout.c b/cpukit/score/src/coretodabsolutetimeout.c
new file mode 100644
index 0000000000..6c9ffc22d5
--- /dev/null
+++ b/cpukit/score/src/coretodabsolutetimeout.c
@@ -0,0 +1,77 @@
+/**
+ * @file
+ *
+ * @brief Convert Absolute Timeout to Ticks
+ * @ingroup ScoreTOD
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2008.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/score/todimpl.h>
+
+/*
+ *  The abstime is a walltime.  We turn it into an interval.
+ */
+TOD_Absolute_timeout_conversion_results _TOD_Absolute_timeout_to_ticks(
+  const struct timespec *abstime,
+  Watchdog_Interval     *ticks_out
+)
+{
+  struct timespec current_time;
+  struct timespec difference;
+
+
+  /*
+   *  Make sure there is always a value returned.
+   */
+  *ticks_out = 0;
+
+  /*
+   *  Is the absolute time even valid?
+   */
+  if ( !_Timespec_Is_valid(abstime) )
+    return TOD_ABSOLUTE_TIMEOUT_INVALID;
+
+  /*
+   *  Is the absolute time in the past?
+   */
+  _TOD_Get_as_timespec( &current_time );
+
+  if ( _Timespec_Less_than( abstime, &current_time ) )
+    return TOD_ABSOLUTE_TIMEOUT_IS_IN_PAST;
+
+  /*
+   *  How long until the requested absolute time?
+   */
+  _Timespec_Subtract( &current_time, abstime, &difference );
+
+  /*
+   *  Internally the SuperCore uses ticks, so convert to them.
+   */
+  *ticks_out = _Timespec_To_ticks( &difference );
+
+  /*
+   *  If the difference was 0, then the future is now.  It is so bright
+   *  we better wear shades.
+   */
+  if ( !*ticks_out )
+    return TOD_ABSOLUTE_TIMEOUT_IS_NOW;
+
+  /*
+   *  This is the case we were expecting and it took this long to
+   *  get here.
+   */
+  return TOD_ABSOLUTE_TIMEOUT_IS_IN_FUTURE;
+}
+