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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "PageBlock.h"
#if OS(UNIX)
#include <unistd.h>
#endif
#if OS(WINDOWS)
#include <malloc.h>
#include <windows.h>
#endif
namespace WTF {
static size_t s_pageSize;
static size_t s_pageMask;
#if OS(UNIX)
inline size_t systemPageSize()
{
return ::sysconf(_SC_PAGESIZE);
}
#elif OS(WINDOWS)
inline size_t systemPageSize()
{
static size_t size = 0;
SYSTEM_INFO system_info;
#if OS(WINRT)
GetNativeSystemInfo(&system_info);
#else
GetSystemInfo(&system_info);
#endif
size = system_info.dwPageSize;
return size;
}
#endif
size_t pageSize()
{
if (!s_pageSize)
s_pageSize = systemPageSize();
ASSERT(isPowerOfTwo(s_pageSize));
return s_pageSize;
}
size_t pageMask()
{
if (!s_pageMask)
s_pageMask = ~(pageSize() - 1);
return s_pageMask;
}
} // namespace WTF
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