From 0faa9dad0768f0291cb44d8d0dcb74fd3f362cc2 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 24 Nov 2010 15:51:28 +0000
Subject: 2010-11-24	Gedare Bloom <giddyup44@yahoo.com>

	PR 1647/cpukit
	* posix/src/nanosleep.c, posix/src/sched_yield.c,
	rtems/src/taskwakeafter.c, sapi/include/confdefs.h,
	sapi/include/rtems/config.h, sapi/src/exinit.c, score/Makefile.am,
	score/preinstall.am, score/include/rtems/score/prioritybitmap.h,
	score/include/rtems/score/thread.h,
	score/inline/rtems/score/thread.inl, score/src/thread.c,
	score/src/threadchangepriority.c, score/src/threadclearstate.c,
	score/src/threadclose.c, score/src/threadinitialize.c,
	score/src/threadready.c, score/src/threadresume.c,
	score/src/threadsetpriority.c, score/src/threadsetstate.c,
	score/src/threadsettransient.c,	score/src/threadsuspend.c,
	score/src/threadtickletimeslice.c: Refactor scheduler out of thread
	handler to facilitate alternate scheduler implementations.
	* score/src/threadyieldprocessor.c: Removed.
	* score/src/schedulerprioritythreadschedulerupdate.c,
	score/src/schedulerprioritythreadschedulerfree.c,
	score/src/schedulerpriorityblock.c, score/src/scheduler.c,
	score/src/schedulerprioritythreadschedulerallocate.c,
	score/src/schedulerpriorityunblock.c,
	score/src/schedulerpriority.c, score/src/schedulerpriorityyield.c,
	score/include/rtems/score/schedulerpriority.h,
	score/include/rtems/score/scheduler.h,
	score/inline/rtems/score/scheduler.inl,
	score/inline/rtems/score/schedulerpriority.inl: New files.
---
 cpukit/score/src/schedulerpriorityyield.c | 77 +++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 cpukit/score/src/schedulerpriorityyield.c

(limited to 'cpukit/score/src/schedulerpriorityyield.c')

diff --git a/cpukit/score/src/schedulerpriorityyield.c b/cpukit/score/src/schedulerpriorityyield.c
new file mode 100644
index 0000000000..1a13a4e318
--- /dev/null
+++ b/cpukit/score/src/schedulerpriorityyield.c
@@ -0,0 +1,77 @@
+/*
+ *  Scheduler Handler
+ *
+ *  Copyright (C) 2010 Gedare Bloom.
+ *
+ *  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/apiext.h>
+#include <rtems/score/context.h>
+#include <rtems/score/interr.h>
+#include <rtems/score/isr.h>
+#include <rtems/score/object.h>
+#include <rtems/score/priority.h>
+#include <rtems/score/scheduler.h>
+#include <rtems/score/states.h>
+#include <rtems/score/sysstate.h>
+#include <rtems/score/thread.h>
+#include <rtems/score/threadq.h>
+#include <rtems/score/userext.h>
+#include <rtems/score/wkspace.h>
+
+/*
+ *  _Scheduler_priority_Yield
+ *
+ *  This kernel routine will remove the running THREAD from the ready queue
+ *  and place it immediately at the rear of this chain.  Reset timeslice
+ *  and yield the processor functions both use this routine, therefore if
+ *  reset is true and this is the only thread on the queue then the
+ *  timeslice counter is reset.  The heir THREAD will be updated if the
+ *  running is also the currently the heir.
+ *
+ *  Input parameters:
+ *    the_scheduler - pointer to scheduler control
+ *
+ *  Output parameters:  NONE
+ *
+ *  INTERRUPT LATENCY:
+ *    ready chain
+ *    select heir
+ */
+
+void _Scheduler_priority_Yield( 
+    Scheduler_Control   *the_scheduler
+)
+{
+  ISR_Level       level;
+  Thread_Control *executing;
+  Chain_Control  *ready;
+
+  executing = _Thread_Executing;
+  ready = executing->scheduler.priority->ready_chain;
+  _ISR_Disable( level );
+    if ( !_Chain_Has_only_one_node( ready ) ) {
+      _Chain_Extract_unprotected( &executing->Object.Node );
+      _Chain_Append_unprotected( ready, &executing->Object.Node );
+
+      _ISR_Flash( level );
+
+      if ( _Thread_Is_heir( executing ) )
+        _Thread_Heir = (Thread_Control *) ready->first;
+      _Thread_Dispatch_necessary = true;
+    }
+    else if ( !_Thread_Is_heir( executing ) )
+      _Thread_Dispatch_necessary = true;
+
+  _ISR_Enable( level );
+}
-- 
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