v29.4-roots.3 · Commit 2: [PATCH 02/30] runtime: preserve shared operator controls
src/common/system_ram.cpp
Before: /dev/null · After: src/common/system_ram.cpp
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new file mode 100644 index 0000000000000000000000000000000000000000..5904e924adecd9ee0371bf9aa61c0b97de721323
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src/common/system_ram.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-present The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <common/system_ram.h>
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#ifdef WIN32
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#include <windows.h>
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#else
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#include <unistd.h>
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#endif
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#include <algorithm>
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#include <cstdint>
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#include <limits>
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std::optional<size_t> TryGetTotalRam()
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{
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static const auto total_ram{[]() -> std::optional<size_t> {
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[[maybe_unused]] auto clamp{[](uint64_t v) { return size_t(std::min(v, uint64_t{std::numeric_limits<size_t>::max()})); }};
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#ifdef WIN32
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if (MEMORYSTATUSEX m{}; (m.dwLength = sizeof(m), GlobalMemoryStatusEx(&m))) return clamp(m.ullTotalPhys);
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#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__illumos__) || defined(__linux__)
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if (long p{sysconf(_SC_PHYS_PAGES)}, s{sysconf(_SC_PAGESIZE)}; p > 0 && s > 0) return clamp(1ULL * p * s);
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#endif
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return std::nullopt;
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}()};
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return total_ram;
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}
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