1*4bdff4beSrobert // -*- C++ -*- 2*4bdff4beSrobert //===----------------------------------------------------------------------===// 3*4bdff4beSrobert // 4*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 6*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7*4bdff4beSrobert // 8*4bdff4beSrobert //===----------------------------------------------------------------------===// 9*4bdff4beSrobert 10*4bdff4beSrobert #ifndef _LIBCPP___CHRONO_CONVERT_TO_TIMESPEC_H 11*4bdff4beSrobert #define _LIBCPP___CHRONO_CONVERT_TO_TIMESPEC_H 12*4bdff4beSrobert 13*4bdff4beSrobert #include <__chrono/duration.h> 14*4bdff4beSrobert #include <__config> 15*4bdff4beSrobert #include <limits> 16*4bdff4beSrobert 17*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18*4bdff4beSrobert # pragma GCC system_header 19*4bdff4beSrobert #endif 20*4bdff4beSrobert 21*4bdff4beSrobert _LIBCPP_PUSH_MACROS 22*4bdff4beSrobert #include <__undef_macros> 23*4bdff4beSrobert 24*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 25*4bdff4beSrobert 26*4bdff4beSrobert // Convert a nanoseconds duration to the given TimeSpec type, which must have 27*4bdff4beSrobert // the same properties as std::timespec. 28*4bdff4beSrobert template <class _TimeSpec> 29*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI inline __convert_to_timespec(const chrono::nanoseconds & __ns)30*4bdff4beSrobert_TimeSpec __convert_to_timespec(const chrono::nanoseconds& __ns) 31*4bdff4beSrobert { 32*4bdff4beSrobert using namespace chrono; 33*4bdff4beSrobert seconds __s = duration_cast<seconds>(__ns); 34*4bdff4beSrobert _TimeSpec __ts; 35*4bdff4beSrobert typedef decltype(__ts.tv_sec) __ts_sec; 36*4bdff4beSrobert const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max(); 37*4bdff4beSrobert 38*4bdff4beSrobert if (__s.count() < __ts_sec_max) 39*4bdff4beSrobert { 40*4bdff4beSrobert __ts.tv_sec = static_cast<__ts_sec>(__s.count()); 41*4bdff4beSrobert __ts.tv_nsec = static_cast<decltype(__ts.tv_nsec)>((__ns - __s).count()); 42*4bdff4beSrobert } 43*4bdff4beSrobert else 44*4bdff4beSrobert { 45*4bdff4beSrobert __ts.tv_sec = __ts_sec_max; 46*4bdff4beSrobert __ts.tv_nsec = 999999999; // (10^9 - 1) 47*4bdff4beSrobert } 48*4bdff4beSrobert 49*4bdff4beSrobert return __ts; 50*4bdff4beSrobert } 51*4bdff4beSrobert 52*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 53*4bdff4beSrobert 54*4bdff4beSrobert _LIBCPP_POP_MACROS 55*4bdff4beSrobert 56*4bdff4beSrobert #endif // _LIBCPP___CHRONO_CONVERT_TO_TIMESPEC_H 57