1/*
2 *  Copyright (C) 2013 Collabora Ltd.
3 *
4 *  This library is free software; you can redistribute it and/or
5 *  modify it under the terms of the GNU Library General Public
6 *  License as published by the Free Software Foundation; either
7 *  version 2 of the License, or (at your option) any later version.
8 *
9 *  This library is distributed in the hope that it will be useful,
10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 *  Library General Public License for more details.
13 *
14 *  You should have received a copy of the GNU Library General Public License
15 *  along with this library; see the file COPYING.LIB.  If not, write to
16 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 *  Boston, MA 02110-1301, USA.
18 */
19
20#ifndef GMutexLocker_h
21#define GMutexLocker_h
22
23#if USE(GLIB)
24
25#include <glib.h>
26
27#include <wtf/FastMalloc.h>
28#include <wtf/Noncopyable.h>
29
30namespace WebCore {
31
32class GMutexLocker {
33    WTF_MAKE_NONCOPYABLE(GMutexLocker); WTF_MAKE_FAST_ALLOCATED;
34
35public:
36    inline explicit GMutexLocker(GMutex* mutex)
37        : m_mutex(mutex)
38        , m_val(0)
39    {
40        lock();
41    }
42
43    inline ~GMutexLocker() { unlock(); }
44
45    inline void lock()
46    {
47        if (m_mutex && !m_val) {
48            g_mutex_lock(m_mutex);
49            m_val = 1;
50        }
51    }
52
53    inline void unlock()
54    {
55        if (m_mutex && m_val) {
56            m_val = 0;
57            g_mutex_unlock(m_mutex);
58        }
59    }
60
61    inline GMutex* mutex() const { return m_mutex; }
62
63private:
64    GMutex* m_mutex;
65    uint8_t m_val;
66};
67
68}
69
70#endif // USE(GLIB)
71
72#endif // GMutexLocker_h
73