1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#include <__config> 10#include <chrono> 11#include <filesystem> 12#include <time.h> 13 14#if defined(_LIBCPP_WIN32API) 15# include "time_utils.h" 16#endif 17 18#if defined(_LIBCPP_WIN32API) 19# define WIN32_LEAN_AND_MEAN 20# define NOMINMAX 21# include <windows.h> 22#endif 23 24#if __has_include(<unistd.h>) 25# include <unistd.h> // _POSIX_TIMERS 26#endif 27 28#if __has_include(<sys/time.h>) 29# include <sys/time.h> // for gettimeofday and timeval 30#endif 31 32#if defined(__APPLE__) || defined(__gnu_hurd__) || (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) 33# define _LIBCPP_HAS_CLOCK_GETTIME 34#endif 35 36_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 37 38const bool _FilesystemClock::is_steady; 39 40_FilesystemClock::time_point _FilesystemClock::now() noexcept { 41 typedef chrono::duration<rep> __secs; 42#if defined(_LIBCPP_WIN32API) 43 typedef chrono::duration<rep, nano> __nsecs; 44 FILETIME time; 45 GetSystemTimeAsFileTime(&time); 46 detail::TimeSpec tp = detail::filetime_to_timespec(time); 47 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 48#elif defined(_LIBCPP_HAS_CLOCK_GETTIME) 49 typedef chrono::duration<rep, nano> __nsecs; 50 struct timespec tp; 51 if (0 != clock_gettime(CLOCK_REALTIME, &tp)) 52 __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed"); 53 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 54#else 55 typedef chrono::duration<rep, micro> __microsecs; 56 timeval tv; 57 gettimeofday(&tv, 0); 58 return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec)); 59#endif 60} 61 62_LIBCPP_END_NAMESPACE_FILESYSTEM 63