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 38 const 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) + 48 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) + 55 chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 56 #else 57 typedef chrono::duration<rep, micro> __microsecs; 58 timeval tv; 59 gettimeofday(&tv, 0); 60 return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec)); 61 #endif 62 } 63 64 _LIBCPP_END_NAMESPACE_FILESYSTEM 65