1/* 2 * Copyright (C) 2012 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 "RAMSize.h" 28 29#include "StdLibExtras.h" 30#if OS(DARWIN) 31#include <sys/param.h> 32#include <sys/types.h> 33#include <sys/sysctl.h> 34#elif OS(UNIX) 35#include <unistd.h> 36#elif OS(WINDOWS) 37#include <windows.h> 38#endif 39 40namespace WTF { 41 42static const size_t ramSizeGuess = 128 * MB; 43 44static size_t computeRAMSize() 45{ 46#if OS(DARWIN) 47 int mib[2]; 48 uint64_t ramSize; 49 size_t length; 50 51 mib[0] = CTL_HW; 52 mib[1] = HW_MEMSIZE; 53 length = sizeof(int64_t); 54 int sysctlResult = sysctl(mib, 2, &ramSize, &length, 0, 0); 55 if (sysctlResult == -1) 56 return ramSizeGuess; 57 return ramSize > std::numeric_limits<size_t>::max() ? std::numeric_limits<size_t>::max() : static_cast<size_t>(ramSize); 58#elif OS(UNIX) 59 long pages = sysconf(_SC_PHYS_PAGES); 60 long pageSize = sysconf(_SC_PAGE_SIZE); 61 if (pages == -1 || pageSize == -1) 62 return ramSizeGuess; 63 return pages * pageSize; 64#elif OS(WINCE) 65 MEMORYSTATUS status; 66 status.dwLength = sizeof(status); 67 GlobalMemoryStatus(&status); 68 if (status.dwTotalPhys <= 0) 69 return ramSizeGuess; 70 return status.dwTotalPhys; 71#elif OS(WINDOWS) 72 MEMORYSTATUSEX status; 73 status.dwLength = sizeof(status); 74 bool result = GlobalMemoryStatusEx(&status); 75 if (!result) 76 return ramSizeGuess; 77 return status.ullTotalPhys; 78#endif 79} 80 81size_t ramSize() 82{ 83 static const size_t ramSize = computeRAMSize(); 84 return ramSize; 85} 86 87} // namespace WTF 88