1/*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/PageBlock.h>
28
29#if OS(UNIX)
30#include <unistd.h>
31#endif
32
33#if OS(WINDOWS)
34#include <malloc.h>
35#include <windows.h>
36#endif
37
38namespace WTF {
39
40static size_t s_pageSize;
41static size_t s_pageMask;
42
43#if OS(UNIX)
44
45inline size_t systemPageSize()
46{
47 return getpagesize();
48}
49
50#elif OS(WINDOWS)
51
52inline size_t systemPageSize()
53{
54 static size_t size = 0;
55 SYSTEM_INFO system_info;
56 GetSystemInfo(&system_info);
57 size = system_info.dwPageSize;
58 return size;
59}
60
61#endif
62
63size_t pageSize()
64{
65 if (!s_pageSize)
66 s_pageSize = systemPageSize();
67 ASSERT(isPowerOfTwo(s_pageSize));
68 return s_pageSize;
69}
70
71size_t pageMask()
72{
73 if (!s_pageMask)
74 s_pageMask = ~(pageSize() - 1);
75 return s_pageMask;
76}
77
78} // namespace WTF
79