2011-09-11 Petr Benes <benesp16@fel.cvut.cz>

	PR 1896/cpukit
	* sapi/include/confdefs.h, score/Makefile.am, score/preinstall.am: Add
	Earliest Deadline First (EDF) Scheduling Algorithm implementation.
	* score/include/rtems/score/scheduleredf.h, score/src/scheduleredf.c,
	score/src/scheduleredfallocate.c, score/src/scheduleredfblock.c,
	score/src/scheduleredfenqueue.c,
	score/src/scheduleredfenqueuefirst.c,
	score/src/scheduleredfextract.c, score/src/scheduleredffree.c,
	score/src/scheduleredfprioritycompare.c,
	score/src/scheduleredfreleasejob.c, score/src/scheduleredfschedule.c,
	score/src/scheduleredfunblock.c, score/src/scheduleredfupdate.c,
	score/src/scheduleredfyield.c: New files.

1 files changed, 47 insertions, 0 deletions

diff --git a/cpukit/score/src/scheduleredfunblock.c b/cpukit/score/src/scheduleredfunblock.c
new file mode 100644
index 0000000000..bca071adbc
--- /dev/null
+++ b/cpukit/score/src/scheduleredfunblock.c
@@ -0,0 +1,47 @@
+/*
+ *  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/score/scheduler.h>
+#include <rtems/score/scheduleredf.h>
+
+void _Scheduler_EDF_Unblock(
+  Thread_Control    *the_thread
+)
+{
+  _Scheduler_EDF_Enqueue(the_thread);
+  /* TODO: flash critical section? */
+
+  /*
+   *  If the thread that was unblocked is more important than the heir,
+   *  then we have a new heir.  This may or may not result in a
+   *  context switch.
+   *
+   *  Normal case:
+   *    If the current thread is preemptible, then we need to do
+   *    a context switch.
+   *  Pseudo-ISR case:
+   *    Even if the thread isn't preemptible, if the new heir is
+   *    a pseudo-ISR system task, we need to do a context switch.
+   */
+  if ( _Scheduler_Is_priority_lower_than(
+         _Thread_Heir->current_priority,
+         the_thread->current_priority )) {
+    _Thread_Heir = the_thread;
+    if ( _Thread_Executing->is_preemptible ||
+         the_thread->current_priority == 0 )
+      _Thread_Dispatch_necessary = true;
+  }
+}