1 files changed, 49 insertions, 0 deletions
diff --git a/cpukit/score/src/scheduleredf.c b/cpukit/score/src/scheduleredf.c
new file mode 100644
index 0000000000..2aa2d52cea
--- /dev/null
+++ b/cpukit/score/src/scheduleredf.c
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (C) 2011 Petr Benes.
+ *  Copyright (C) 2011 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/config.h>
+#include <rtems/score/scheduler.h>
+#include <rtems/score/scheduleredf.h>
+
+int _Scheduler_EDF_RBTree_compare_function
+(
+  RBTree_Node* n1,
+  RBTree_Node* n2
+)
+{
+  Priority_Control value1 = _RBTree_Container_of
+    (n1,Scheduler_EDF_Per_thread,Node)->thread->current_priority;
+  Priority_Control value2 = _RBTree_Container_of
+    (n2,Scheduler_EDF_Per_thread,Node)->thread->current_priority;
+
+  /*
+   * This function compares only numbers for the red-black tree,
+   * but priorities have an opposite sense.
+   */
+  return (-1)*_Scheduler_Is_priority_higher_than(value1, value2);
+}
+
+void _Scheduler_EDF_Initialize(void)
+{
+  _RBTree_Initialize_empty(
+      &_Scheduler_EDF_Ready_queue,
+      &_Scheduler_EDF_RBTree_compare_function,
+      0
+  );
+}
+
+/* Instantiate any global variables needed by the EDF scheduler */
+RBTree_Control _Scheduler_EDF_Ready_queue;