| 1 | /* |
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| 2 | * Copyright (C) 2010 Apple Inc. All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
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| 14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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| 15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
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| 17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
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| 23 | * THE POSSIBILITY OF SUCH DAMAGE. |
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| 24 | */ |
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| 25 | |
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| 26 | #include "config.h" |
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| 27 | #include "PageBlock.h" |
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| 28 | |
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| 29 | #if OS(UNIX) |
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| 30 | #include <unistd.h> |
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| 31 | #endif |
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| 32 | |
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| 33 | #if OS(WINDOWS) |
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| 34 | #include <malloc.h> |
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| 35 | #include <qt_windows.h> |
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| 36 | #endif |
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| 37 | |
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| 38 | namespace WTF { |
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| 39 | |
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| 40 | static size_t s_pageSize; |
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| 41 | static size_t s_pageMask; |
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| 42 | |
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| 43 | #if OS(UNIX) |
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| 44 | |
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| 45 | inline size_t systemPageSize() |
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| 46 | { |
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| 47 | return ::sysconf(_SC_PAGESIZE); |
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| 48 | } |
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| 49 | |
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| 50 | #elif OS(WINDOWS) |
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| 51 | |
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| 52 | inline size_t systemPageSize() |
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| 53 | { |
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| 54 | static size_t size = 0; |
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| 55 | SYSTEM_INFO system_info; |
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| 56 | #if OS(WINRT) |
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| 57 | GetNativeSystemInfo(&system_info); |
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| 58 | #else |
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| 59 | GetSystemInfo(&system_info); |
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| 60 | #endif |
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| 61 | size = system_info.dwPageSize; |
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| 62 | return size; |
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| 63 | } |
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| 64 | |
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| 65 | #endif |
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| 66 | |
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| 67 | inline namespace hidden { |
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| 68 | size_t pageSize() |
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| 69 | { |
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| 70 | if (!s_pageSize) |
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| 71 | s_pageSize = systemPageSize(); |
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| 72 | ASSERT(isPowerOfTwo(s_pageSize)); |
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| 73 | return s_pageSize; |
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| 74 | } |
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| 75 | |
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| 76 | size_t pageMask() |
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| 77 | { |
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| 78 | if (!s_pageMask) |
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| 79 | s_pageMask = ~(pageSize() - 1); |
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| 80 | return s_pageMask; |
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| 81 | } |
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| 82 | } |
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| 83 | |
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| 84 | } // namespace WTF |
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| 85 | |
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