| 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) |
|---|
| 30 | #include <unistd.h> |
|---|
| 31 | #endif |
|---|
| 32 | |
|---|
| 33 | #if OS(WINDOWS) |
|---|
| 34 | #include <malloc.h> |
|---|
| 35 | #include <windows.h> |
|---|
| 36 | #endif |
|---|
| 37 | |
|---|
| 38 | namespace WTF { |
|---|
| 39 | |
|---|
| 40 | static size_t s_pageSize; |
|---|
| 41 | static size_t s_pageMask; |
|---|
| 42 | |
|---|
| 43 | #if OS(UNIX) |
|---|
| 44 | |
|---|
| 45 | inline size_t systemPageSize() |
|---|
| 46 | { |
|---|
| 47 | return ::sysconf(_SC_PAGESIZE); |
|---|
| 48 | } |
|---|
| 49 | |
|---|
| 50 | #elif OS(WINDOWS) |
|---|
| 51 | |
|---|
| 52 | inline size_t systemPageSize() |
|---|
| 53 | { |
|---|
| 54 | static size_t size = 0; |
|---|
| 55 | SYSTEM_INFO system_info; |
|---|
| 56 | #if OS(WINRT) |
|---|
| 57 | GetNativeSystemInfo(&system_info); |
|---|
| 58 | #else |
|---|
| 59 | GetSystemInfo(&system_info); |
|---|
| 60 | #endif |
|---|
| 61 | size = system_info.dwPageSize; |
|---|
| 62 | return size; |
|---|
| 63 | } |
|---|
| 64 | |
|---|
| 65 | #endif |
|---|
| 66 | |
|---|
| 67 | inline namespace hidden { |
|---|
| 68 | size_t pageSize() |
|---|
| 69 | { |
|---|
| 70 | if (!s_pageSize) |
|---|
| 71 | s_pageSize = systemPageSize(); |
|---|
| 72 | ASSERT(isPowerOfTwo(s_pageSize)); |
|---|
| 73 | return s_pageSize; |
|---|
| 74 | } |
|---|
| 75 | |
|---|
| 76 | size_t pageMask() |
|---|
| 77 | { |
|---|
| 78 | if (!s_pageMask) |
|---|
| 79 | s_pageMask = ~(pageSize() - 1); |
|---|
| 80 | return s_pageMask; |
|---|
| 81 | } |
|---|
| 82 | } |
|---|
| 83 | |
|---|
| 84 | } // namespace WTF |
|---|
| 85 | |
|---|
