2011-03-16 Jennifer Averett <jennifer.averett@OARcorp.com>

	PR 1743/cpu
	* sapi/include/confdefs.h, score/Makefile.am, score/preinstall.am: Add
	Simple Priority Scheduler as complement to existing Deterministic
	Priority Scheduler. This scheduler serves both as an example and as a
	lighter weight implementation for smaller systems.
	* score/include/rtems/score/schedulersimple.h,
	score/inline/rtems/score/schedulersimple.inl,
	score/src/schedulersimple.c, score/src/schedulersimpleblock.c,
	score/src/schedulersimpleenqueue.c,
	score/src/schedulersimpleenqueuefirst.c,
	score/src/schedulersimpleextract.c,
	score/src/schedulersimplereadyqueueenqueue.c,
	score/src/schedulersimplereadyqueueenqueuefirst.c,
	score/src/schedulersimpleschedule.c,
	score/src/schedulersimpleunblock.c, score/src/schedulersimpleyield.c:
	New files.

1 files changed, 84 insertions, 0 deletions

diff --git a/cpukit/score/src/schedulersimple.c b/cpukit/score/src/schedulersimple.c
new file mode 100644
index 0000000000..7a7ed944f4
--- /dev/null
+++ b/cpukit/score/src/schedulersimple.c
@@ -0,0 +1,84 @@
+/*
+ *  Scheduler Simple Handler / Initialize
+ *  Scheduler Simple Handler / Allocate (Empty Routine)
+ *  Scheduler Simple Handler / Update (Empty Routine)
+ *  Scheduler Simple Handler / Free (Empty Routine)
+ *
+ *  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/chain.h>
+#include <rtems/score/scheduler.h>
+#include <rtems/score/schedulersimple.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/wkspace.h>
+
+/**
+ * This routine does nothing, and is used as a stub for Schedule allocate
+ *
+ * Note: returns a non-zero value, or else thread initialize thinks the 
+ * allocation failed.
+ *
+ * The overhead of a function call will still be imposed.
+ */
+void * _Scheduler_simple_Allocate( 
+  Thread_Control *the_thread
+)
+{
+  return (void*)-1; /* maybe pick an appropriate poison value */
+}
+
+
+/**
+ * This routine does nothing, and is used as a stub for Schedule update
+ *
+ * The overhead of a function call will still be imposed.
+ */
+void _Scheduler_simple_Update( 
+  Thread_Control *the_thread
+)
+{
+}
+
+/**
+ * This routine does nothing, and is used as a stub for Schedule free
+ *
+ * The overhead of a function call will still be imposed.
+ */
+void _Scheduler_simple_Free( 
+  Thread_Control *the_thread
+)
+{
+}
+
+/**
+ * This routine initializes the simple scheduler.
+ */
+void _Scheduler_simple_Initialize ( void )
+{
+  void *f;
+
+  /* 
+   * Initialize Ready Queue
+   */
+
+  /* allocate ready queue structures */
+  f = _Workspace_Allocate_or_fatal_error( sizeof(Chain_Control) );
+  _Scheduler.information = f;
+
+  /* initialize ready queue structure */
+  _Chain_Initialize_empty( (Chain_Control *)f );
+}