source: trunk/src/corelib/arch/sparc/qatomic_sparc.cpp

Last change on this file was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.

File size: 3.1 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the QtCore module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include <QtCore/qatomic.h>
43
44#include <limits.h>
45#include <sched.h>
46
47extern "C" {
48
49int q_atomic_trylock_int(volatile int *addr);
50int q_atomic_trylock_ptr(volatile void *addr);
51
52Q_CORE_EXPORT int q_atomic_lock_int(volatile int *addr)
53{
54 int returnValue = q_atomic_trylock_int(addr);
55
56 if (returnValue == INT_MIN) {
57 do {
58 // spin until we think we can succeed
59 do {
60 sched_yield();
61 returnValue = *addr;
62 } while (returnValue == INT_MIN);
63
64 // try again
65 returnValue = q_atomic_trylock_int(addr);
66 } while (returnValue == INT_MIN);
67 }
68
69 return returnValue;
70}
71
72Q_CORE_EXPORT int q_atomic_lock_ptr(volatile void *addr)
73{
74 int returnValue = q_atomic_trylock_ptr(addr);
75
76 if (returnValue == -1) {
77 do {
78 // spin until we think we can succeed
79 do {
80 sched_yield();
81 returnValue = *reinterpret_cast<volatile int *>(addr);
82 } while (returnValue == -1);
83
84 // try again
85 returnValue = q_atomic_trylock_ptr(addr);
86 } while (returnValue == -1);
87 }
88
89 return returnValue;
90}
91
92} // extern "C"
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