Revision control
++ /*
++ * 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 <qt_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
++
++ inline namespace hidden {
++ 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