source: rtems/cpukit/score/src/rbtreepeek.c @ 9fc284c

4.115
Last change on this file since 9fc284c was 9fc284c, checked in by Sebastian Huber <sebastian.huber@…>, on Mar 30, 2012 at 9:35:39 AM

score/rbtree: Add const qualifier

  • Property mode set to 100644
File size: 1.1 KB
Line 
1/*
2 *  Copyright (c) 2010 Gedare Bloom.
3 *
4 *  The license and distribution terms for this file may be
5 *  found in the file LICENSE in this distribution or at
6 *  http://www.rtems.com/license/LICENSE.
7 *
8 *  $Id$
9 */
10
11#if HAVE_CONFIG_H
12#include "config.h"
13#endif
14
15#include <rtems/system.h>
16#include <rtems/score/address.h>
17#include <rtems/score/rbtree.h>
18#include <rtems/score/isr.h>
19
20/*
21 *  _RBTree_Get
22 *
23 *  This kernel routine returns a pointer to the min or max node on the tree,
24 *  without removing that node.
25 *
26 *  Input parameters:
27 *    the_rbtree - pointer to rbtree header
28 *    dir - specifies whether to return minimum (0) or maximum (1)
29 *
30 *  Output parameters:
31 *    return_node - pointer to node in rbtree allocated
32 *    NULL   - if no nodes available
33 *
34 *  INTERRUPT LATENCY:
35 *    only case
36 */
37
38RBTree_Node *_RBTree_Peek(
39  const RBTree_Control *the_rbtree,
40  RBTree_Direction dir
41)
42{
43  ISR_Level          level;
44  RBTree_Node *return_node;
45
46  return_node = NULL;
47  _ISR_Disable( level );
48      return_node = _RBTree_Peek_unprotected( the_rbtree, dir );
49  _ISR_Enable( level );
50  return return_node;
51}
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