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(__AMDGPU__) || defined(__NVPTX__) || \ 33 (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) 34 # define _LIBCPP_HAS_CLOCK_GETTIME 35 #endif 36 37 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 38 39 const bool _FilesystemClock::is_steady; 40 41 _FilesystemClock::time_point _FilesystemClock::now() noexcept { 42 typedef chrono::duration<rep> __secs; 43 #if defined(_LIBCPP_WIN32API) 44 typedef chrono::duration<rep, nano> __nsecs; 45 FILETIME time; 46 GetSystemTimeAsFileTime(&time); 47 detail::TimeSpec tp = detail::filetime_to_timespec(time); 48 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 49 #elif defined(_LIBCPP_HAS_CLOCK_GETTIME) 50 typedef chrono::duration<rep, nano> __nsecs; 51 struct timespec tp; 52 if (0 != clock_gettime(CLOCK_REALTIME, &tp)) 53 __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed"); 54 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 55 #else 56 typedef chrono::duration<rep, micro> __microsecs; 57 timeval tv; 58 gettimeofday(&tv, 0); 59 return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec)); 60 #endif 61 } 62 63 _LIBCPP_END_NAMESPACE_FILESYSTEM 64