1 files changed, 87 insertions, 0 deletions
diff --git a/cpukit/score/src/watchdogadjust.c b/cpukit/score/src/watchdogadjust.c
new file mode 100644
index 0000000000..89d4859906
--- /dev/null
+++ b/cpukit/score/src/watchdogadjust.c
@@ -0,0 +1,87 @@
+/*
+ *  Watchdog Handler
+ *
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  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.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/watchdog.h>
+
+/*PAGE
+ *
+ *  _Watchdog_Adjust
+ *
+ *  This routine adjusts the delta chain backward or forward in response
+ *  to a time change.
+ *
+ *  Input parameters:
+ *    header    - pointer to the delta chain to be adjusted
+ *    direction - forward or backward adjustment to delta chain
+ *    units     - units to adjust
+ *
+ *  Output parameters:
+ */
+
+void _Watchdog_Adjust(
+  Chain_Control               *header,
+  Watchdog_Adjust_directions   direction,
+  Watchdog_Interval            units
+)
+{
+  ISR_Level level;
+
+  _ISR_Disable( level );
+
+  /*
+   * NOTE: It is safe NOT to make 'header' a pointer
+   *       to volatile data (contrast this with watchdoginsert.c)
+   *       because we call _Watchdog_Tickle() below and
+   *       hence the compiler must not assume *header to remain
+   *       unmodified across that call.
+   *
+   *       Till Straumann, 7/2003
+   */
+  if ( !_Chain_Is_empty( header ) ) {
+    switch ( direction ) {
+      case WATCHDOG_BACKWARD:
+        _Watchdog_First( header )->delta_interval += units;
+        break;
+      case WATCHDOG_FORWARD:
+        while ( units ) {
+          if ( units < _Watchdog_First( header )->delta_interval ) {
+            _Watchdog_First( header )->delta_interval -= units;
+            break;
+          } else {
+            units -= _Watchdog_First( header )->delta_interval;
+            _Watchdog_First( header )->delta_interval = 1;
+
+            _ISR_Enable( level );
+
+            _Watchdog_Tickle( header );
+
+            _ISR_Disable( level );
+
+            if ( _Chain_Is_empty( header ) )
+              break;
+          }
+        }
+        break;
+    }
+  }
+
+  _ISR_Enable( level );
+
+}