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, 42 insertions, 0 deletions

diff --git a/cpukit/score/src/schedulersimpleyield.c b/cpukit/score/src/schedulersimpleyield.c
new file mode 100644
index 0000000000..61e80db7e2
--- /dev/null
+++ b/cpukit/score/src/schedulersimpleyield.c
@@ -0,0 +1,42 @@
+/*
+ *  Scheduler Simple Handler / Yield
+ *
+ *  COPYRIGHT (c) 2011.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in 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/scheduler.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/schedulersimple.h>
+
+void _Scheduler_simple_Yield( void )
+{
+  ISR_Level       level;
+  Thread_Control *executing;
+
+  executing = _Thread_Executing;
+  _ISR_Disable( level );
+      
+    _Scheduler_simple_Ready_queue_Requeue(&_Scheduler, executing);
+
+    _ISR_Flash( level );
+
+    _Scheduler_simple_Schedule();
+    
+    if ( !_Thread_Is_heir( executing ) )
+      _Thread_Dispatch_necessary = true;
+
+  _ISR_Enable( level );
+}