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37 lines
995 B
C++
37 lines
995 B
C++
/*
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* Copyright (C) 2017-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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#pragma once
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#include <algorithm>
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#include <atomic>
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#include <chrono>
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#include <cstdint>
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extern std::atomic<int64_t> clocks_offset;
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template<typename Duration>
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inline void forward_jump_clocks(Duration delta)
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{
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auto d = std::chrono::duration_cast<std::chrono::seconds>(delta).count();
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clocks_offset.fetch_add(d, std::memory_order_relaxed);
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}
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inline std::chrono::seconds get_clocks_offset()
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{
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auto off = clocks_offset.load(std::memory_order_relaxed);
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return std::chrono::seconds(off);
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}
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// Returns a time point which is earlier from t by d, or minimum time point if it cannot be represented.
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template<typename Clock, typename Duration, typename Rep, typename Period>
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inline
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auto saturating_subtract(std::chrono::time_point<Clock, Duration> t, std::chrono::duration<Rep, Period> d) -> decltype(t) {
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return std::max(t, decltype(t)::min() + d) - d;
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}
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