forked from OSchip/llvm-project
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CHRONO_CONVERT_TO_TIMESPEC_H
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#define _LIBCPP___CHRONO_CONVERT_TO_TIMESPEC_H
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#include <__chrono/duration.h>
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#include <__config>
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#include <limits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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// Convert a nanoseconds duration to the given TimeSpec type, which must have
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// the same properties as std::timespec.
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template <class _TimeSpec>
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_LIBCPP_HIDE_FROM_ABI inline
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_TimeSpec __convert_to_timespec(const chrono::nanoseconds& __ns)
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{
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using namespace chrono;
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seconds __s = duration_cast<seconds>(__ns);
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_TimeSpec __ts;
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typedef decltype(__ts.tv_sec) __ts_sec;
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const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max();
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if (__s.count() < __ts_sec_max)
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{
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__ts.tv_sec = static_cast<__ts_sec>(__s.count());
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__ts.tv_nsec = static_cast<decltype(__ts.tv_nsec)>((__ns - __s).count());
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}
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else
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{
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__ts.tv_sec = __ts_sec_max;
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__ts.tv_nsec = 999999999; // (10^9 - 1)
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}
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return __ts;
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___CHRONO_CONVERT_TO_TIMESPEC_H
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