/* * Copyright (C) 2012 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 "RAMSize.h" #include "StdLibExtras.h" #if OS(DARWIN) #include <sys/param.h> #include <sys/types.h> #include <sys/sysctl.h> #elif OS(UNIX) #include <unistd.h> #elif OS(WINDOWS) #include <windows.h> #endif namespace WTF { static const size_t ramSizeGuess = 128 * MB; static size_t computeRAMSize() { #if OS(DARWIN) int mib[2]; uint64_t ramSize; size_t length; mib[0] = CTL_HW; mib[1] = HW_MEMSIZE; length = sizeof(int64_t); int sysctlResult = sysctl(mib, 2, &ramSize, &length, 0, 0); if (sysctlResult == -1) return ramSizeGuess; return ramSize > std::numeric_limits<size_t>::max() ? std::numeric_limits<size_t>::max() : static_cast<size_t>(ramSize); #elif OS(UNIX) long pages = sysconf(_SC_PHYS_PAGES); long pageSize = sysconf(_SC_PAGE_SIZE); if (pages == -1 || pageSize == -1) return ramSizeGuess; return pages * pageSize; #elif OS(WINCE) MEMORYSTATUS status; status.dwLength = sizeof(status); GlobalMemoryStatus(&status); if (status.dwTotalPhys <= 0) return ramSizeGuess; return status.dwTotalPhys; #elif OS(WINDOWS) MEMORYSTATUSEX status; status.dwLength = sizeof(status); bool result = GlobalMemoryStatusEx(&status); if (!result) return ramSizeGuess; return status.ullTotalPhys; #endif } size_t ramSize() { static const size_t ramSize = computeRAMSize(); return ramSize; } } // namespace WTF