From eb02f47b126b56091ffaeaad470a48e2ac6d57b5 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 10 Nov 1999 13:48:27 +0000
Subject: Committed modifications from ITRON Task and Task Dependendent
 Synchronization Working Group.  Included are tests.

---
 c/src/exec/score/src/threadrotatequeue.c | 93 ++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 c/src/exec/score/src/threadrotatequeue.c

(limited to 'c/src/exec/score/src/threadrotatequeue.c')

diff --git a/c/src/exec/score/src/threadrotatequeue.c b/c/src/exec/score/src/threadrotatequeue.c
new file mode 100644
index 0000000000..f7ee9c12f5
--- /dev/null
+++ b/c/src/exec/score/src/threadrotatequeue.c
@@ -0,0 +1,93 @@
+/*
+ *  Thread Handler
+ *
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#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/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>
+
+/*PAGE
+ *
+ *  _Thread_Rotate_Ready_Queue
+ *
+ *  This kernel routine will rotate the ready queue.
+ *  remove the running THREAD from the ready chain
+ *  and place it immediatly 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 chain then the
+ *  timeslice counter is reset.  The heir THREAD will be updated if the
+ *  running is also the currently the heir.
+ *
+ *  Input parameters:  
+ *      Priority of the queue we wish to modify.
+ *
+ *  Output parameters:  NONE
+ *
+ *  INTERRUPT LATENCY:
+ *    ready chain
+ *    select heir
+ */
+
+void _Thread_Rotate_Ready_Queue( 
+  Priority_Control  priority
+)
+{
+  ISR_Level       level;
+  Thread_Control *executing;
+  Chain_Control  *ready;
+  Chain_Node     *node;
+
+  ready     = &_Thread_Ready_chain[ priority ];
+  executing = _Thread_Executing;
+
+  if ( ready == executing->ready ) {
+    _Thread_Yield_processor();
+    return;
+  }
+
+  _ISR_Disable( level );
+
+  if ( !_Chain_Is_empty( ready ) ) {
+    if (!_Chain_Has_only_one_node( ready ) ) {
+      node = _Chain_Get_first_unprotected( ready );
+      _Chain_Append_unprotected( ready, node );
+    }
+  }
+
+  _ISR_Flash( level );
+
+  if ( _Thread_Heir->ready == ready )
+    _Thread_Heir = (Thread_Control *) ready->first;
+
+  if ( executing != _Thread_Heir )
+    _Context_Switch_necessary = TRUE;
+
+  _ISR_Enable( level );
+}
+
+
+
+
+
+
-- 
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