92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/*
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* Copyright (C) 2012-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/RAMSize.h>
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#include <mutex>
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#if OS(WINDOWS)
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#include <windows.h>
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#elif defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
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#if OS(HAIKU)
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#include <OS.h>
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#elif OS(LINUX)
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#include <sys/sysinfo.h>
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#elif OS(UNIX)
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#include <unistd.h>
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#endif // OS(LINUX) || OS(UNIX)
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#else
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#include <bmalloc/bmalloc.h>
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#endif
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namespace WTF {
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#if OS(WINDOWS)
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static constexpr size_t ramSizeGuess = 512 * MB;
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#endif
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static size_t computeRAMSize()
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{
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#if OS(WINDOWS)
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MEMORYSTATUSEX status;
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status.dwLength = sizeof(status);
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bool result = GlobalMemoryStatusEx(&status);
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if (!result)
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return ramSizeGuess;
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return status.ullTotalPhys;
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#elif USE(SYSTEM_MALLOC)
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#if OS(LINUX) || OS(FREEBSD)
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struct sysinfo si;
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sysinfo(&si);
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return si.totalram * si.mem_unit;
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#elif OS(UNIX)
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long pages = sysconf(_SC_PHYS_PAGES);
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long pageSize = sysconf(_SC_PAGE_SIZE);
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return pages * pageSize;
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#elif OS(HAIKU)
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system_info si;
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get_system_info(&si);
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return si.max_pages * B_PAGE_SIZE;
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#else
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#error "Missing a platform specific way of determining the available RAM"
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#endif // OS(LINUX) || OS(FREEBSD) || OS(UNIX)
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#else
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return bmalloc::api::availableMemory();
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#endif
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}
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size_t ramSize()
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{
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static size_t ramSize;
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static std::once_flag onceFlag;
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std::call_once(onceFlag, [] {
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ramSize = computeRAMSize();
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});
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return ramSize;
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}
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} // namespace WTF
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