fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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33 lines
891 B
33 lines
891 B
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <folly/Portability.h>
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#include <chrono>
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#include <cstdint>
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#if _MSC_VER && (defined(_M_IX86) || defined(_M_X64))
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extern "C" std::uint64_t __rdtsc();
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#pragma intrinsic(__rdtsc)
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#endif
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namespace folly {
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inline std::uint64_t hardware_timestamp() {
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#if _MSC_VER && (defined(_M_IX86) || defined(_M_X64))
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return __rdtsc();
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#elif __GNUC__ && (__i386__ || FOLLY_X64)
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return __builtin_ia32_rdtsc();
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#else
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// use steady_clock::now() as an approximation for the timestamp counter on
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// non-x86 systems
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return std::chrono::steady_clock::now().time_since_epoch().count();
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#endif
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}
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} // namespace folly
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