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/*
* 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>
#elif OS(QNX)
#include <sys/stat.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;
#elif OS(QNX)
struct stat mst;
if (stat("/proc", &mst))
return ramSizeGuess;
return mst.st_size;
#endif
}
size_t ramSize()
{
static const size_t ramSize = computeRAMSize();
return ramSize;
}
} // namespace WTF
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