wtf/PageBlock.cpp

   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 "PageBlock.h"
  28
  29 #if OS(UNIX) && !OS(SYMBIAN)
  30 #include <unistd.h>
  31 #endif
  32
  33 #if OS(WINDOWS)
  34 #include <malloc.h>
  35 #include <windows.h>
  36 #endif
  37
  38 #if OS(SYMBIAN)
  39 #include <e32hal.h>
  40 #include <e32std.h>
  41 #endif
  42
  43 namespace WTF {
  44
  45 static size_t s_pageSize;
  46
  47 #if OS(UNIX) && !OS(SYMBIAN)
  48
  49 inline size_t systemPageSize()
  50 {
  51     return getpagesize();
  52 }
  53
  54 #elif OS(WINDOWS)
  55
  56 inline size_t systemPageSize()
  57 {
  58     static size_t size = 0;
  59     SYSTEM_INFO system_info;
  60     GetSystemInfo(&system_info);
  61     size = system_info.dwPageSize;
  62     return size;
  63 }
  64
  65 #elif OS(SYMBIAN)
  66
  67 inline size_t systemPageSize()
  68 {
  69     static TInt page_size = 0;
  70     UserHal::PageSizeInBytes(page_size);
  71     return page_size;
  72 }
  73
  74 #endif
  75
  76 size_t pageSize()
  77 {
  78     if (!s_pageSize)
  79         s_pageSize = systemPageSize();
  80     ASSERT(isPowerOfTwo(s_pageSize));
  81     return s_pageSize;
  82 }
  83
  84 } // namespace WTF