2010-08-23 Sebastian Huber <sebastian.huber@embedded-brains.de>

	PR 1673/cpukit
	* score/src/chainappendempty.c, score/src/chaingetempty.c,
	score/src/chainprependempty.c: New files.
	* score/Makefile.am: Reflect changes above.
	* score/include/rtems/score/chain.h: Declare
	_Chain_Append_with_empty_check(), _Chain_Prepend_with_empty_check(),
	and _Chain_Get_with_empty_check().
	* score/inline/rtems/score/chain.inl: Define
	_Chain_Append_with_empty_check_unprotected(),
	_Chain_Prepend_with_empty_check_unprotected(), and
	_Chain_Get_with_empty_check_unprotected().

1 files changed, 44 insertions, 0 deletions

diff --git a/cpukit/score/src/chainprependempty.c b/cpukit/score/src/chainprependempty.c
new file mode 100644
index 0000000000..9dfd9a653f
--- /dev/null
+++ b/cpukit/score/src/chainprependempty.c
@@ -0,0 +1,44 @@
+/**
+ * @file
+ *
+ * @ingroup ScoreChain
+ *
+ * @brief _Chain_Prepend_with_empty_check() implementation.
+ */
+
+/*
+ * Copyright (c) 2010 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * 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.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/score/chain.h>
+#include <rtems/score/isr.h>
+
+bool _Chain_Prepend_with_empty_check(
+  Chain_Control *chain,
+  Chain_Node *node
+)
+{
+  ISR_Level level;
+  bool was_empty;
+
+  _ISR_Disable( level );
+  was_empty = _Chain_Prepend_with_empty_check_unprotected( chain, node );
+  _ISR_Enable( level );
+
+  return was_empty;
+}