std::chrono wrappers for Windows times and timestamps

include/wil/chrono.h

@@ -0,0 +1,370 @@
+//*********************************************************
+//
+//    Copyright (c) Microsoft. All rights reserved.
+//    This code is licensed under the MIT License.
+//    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+//    ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+//    TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+//    PARTICULAR PURPOSE AND NONINFRINGEMENT.
+//
+//*********************************************************
+#ifndef __WIL_CHRONO_INCLUDED
+#define __WIL_CHRONO_INCLUDED
+
+#include "common.h"
+#include "result.h"
+
+#ifdef WIL_KERNEL_MODE
+#error This header is not supported in kernel-mode.
+#endif
+
+#if __WI_CPLUSPLUS < 201103L
+#error This header requires C++11 or later
+#endif
+
+#include <chrono>
+
+#include <minwindef.h> // FILETIME, etc.
+#include <sysinfoapi.h> // GetTickCount[64], GetSystemTime[Precise]AsFileTime
+#include <realtimeapiset.h> // Query[Unbiased]InterruptTime[Precise]
+
+namespace wil
+{
+#pragma region std::chrono wrappers for GetTickCount[64]
+    namespace details
+    {
+        template<typename rep_t, typename get_tick_count_fn_t, get_tick_count_fn_t get_tick_count_fn, typename base_clock_t>
+        struct tick_count_clock_impl
+        {
+            using rep = rep_t;
+            using period = std::milli;
+            using duration = std::chrono::duration<rep, period>;
+            using time_point = std::chrono::time_point<base_clock_t, duration>;
+            static constexpr bool const is_steady = true;
+
+            WI_NODISCARD static time_point now() WI_NOEXCEPT
+            {
+                return time_point{duration{ get_tick_count_fn() }};
+            }
+        };
+    }
+
+    struct tick_count_clock : details::tick_count_clock_impl<DWORD, decltype(&::GetTickCount), ::GetTickCount, tick_count_clock> {};
+#if _WIN32_WINNT >= 0x0600
+    struct tick_count64_clock : details::tick_count_clock_impl<ULONGLONG, decltype(&::GetTickCount64), ::GetTickCount64, tick_count_clock> {};
+#endif // _WIN32_WINNT >= 0x0600
+#pragma endregion
+
+    namespace details
+    {
+        constexpr DWORD64 filetime_to_int(const FILETIME& ft) WI_NOEXCEPT
+        {
+            return (static_cast<DWORD64>(ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
+        }
+
+        constexpr FILETIME filetime_from_int(DWORD64 t) WI_NOEXCEPT
+        {
+            return {
+                static_cast<DWORD>(t >> 32),
+                static_cast<DWORD>(t)
+            };
+        }
+    }
+
+#pragma region std::chrono wrappers for GetSystemTime[Precise]AsFileTime
+    namespace details
+    {
+        template<typename get_system_time_fn_t, get_system_time_fn_t get_system_time_fn, typename base_clock_t>
+        struct system_time_clock_impl
+        {
+        public:
+            using rep = LONGLONG;
+            using period = std::ratio_multiply<std::hecto, std::nano>;
+            using duration = std::chrono::duration<rep, period>;
+            using time_point = std::chrono::time_point<base_clock_t, duration>;
+            static constexpr bool const is_steady = false;
+
+            WI_NODISCARD static time_point now() WI_NOEXCEPT
+            {
+                alignas(rep) FILETIME ft;
+                get_system_time_fn(&ft);
+                return from_filetime(ft);
+            }
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 FILETIME to_filetime(const time_point& t) WI_NOEXCEPT
+            {
+                return filetime_from_int(static_cast<DWORD64>(t.time_since_epoch().count()));
+            }
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_filetime(const FILETIME& ft) WI_NOEXCEPT
+            {
+                return time_point{duration{ static_cast<rep>(filetime_to_int(ft)) }};
+            }
+
+#if __WI_LIBCPP_STD_VER > 11
+            static constexpr time_point unix_epoch{duration{116444736000000000LL}};
+#else
+            static time_point const unix_epoch;
+#endif
+
+        private:
+            template<class Duration>
+            static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 Duration to_unix_epoch(const time_point& t) WI_NOEXCEPT
+            {
+                return std::chrono::duration_cast<Duration>(t - unix_epoch);
+            }
+
+            template<class Duration>
+            static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_unix_epoch(const Duration& t) WI_NOEXCEPT
+            {
+                return std::chrono::time_point_cast<duration>(unix_epoch + t);
+            }
+
+            template<class Rep>
+            static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 Rep to_crt_time(const time_point& t) WI_NOEXCEPT
+            {
+                return to_unix_epoch<std::chrono::duration<Rep>>(t).count();
+            }
+
+            template<class Rep>
+            static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_crt_time(Rep t) WI_NOEXCEPT
+            {
+                return from_unix_epoch(std::chrono::duration<Rep>{t});
+            }
+
+        public:
+            template<class Duration = std::chrono::system_clock::duration>
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 std::chrono::time_point<std::chrono::system_clock, Duration> to_system_clock(const time_point& t) WI_NOEXCEPT
+            {
+                return std::chrono::time_point<std::chrono::system_clock, Duration>{to_unix_epoch<Duration>(t)};
+            }
+
+            template<class Duration>
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_system_clock(const std::chrono::time_point<std::chrono::system_clock, Duration>& t) WI_NOEXCEPT
+            {
+                return from_unix_epoch(t.time_since_epoch());
+            }
+
+#ifndef _CRT_NO_TIME_T
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 ::time_t to_time_t(const time_point& t) WI_NOEXCEPT
+            {
+                return to_crt_time<::time_t>(t);
+            }
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_time_t(::time_t t) WI_NOEXCEPT
+            {
+                return from_crt_time(t);
+            }
+#endif
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 ::__time32_t to_time32_t(const time_point& t) WI_NOEXCEPT
+            {
+                return to_crt_time<::__time32_t>(t);
+            }
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_time32_t(::__time32_t t) WI_NOEXCEPT
+            {
+                return from_crt_time(t);
+            }
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 ::__time64_t to_time64_t(const time_point& t) WI_NOEXCEPT
+            {
+                return to_crt_time<::__time64_t>(t);
+            }
+
+            WI_NODISCARD static __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 time_point from_time64_t(::__time64_t t) WI_NOEXCEPT
+            {
+                return from_crt_time(t);
+            }
+        };
+
+#if __WI_LIBCPP_STD_VER <= 11
+        template<typename get_system_time_fn_t, get_system_time_fn_t get_system_time_fn, typename base_clock_t>
+        typename system_time_clock_impl<get_system_time_fn_t, get_system_time_fn, base_clock_t>::time_point const system_time_clock_impl<get_system_time_fn_t, get_system_time_fn, base_clock_t>::unix_epoch{duration{116444736000000000LL}};
+#endif
+    }
+
+    struct system_time_clock : details::system_time_clock_impl<decltype(&::GetSystemTimeAsFileTime), ::GetSystemTimeAsFileTime, system_time_clock> {};
+
+#if _WIN32_WINNT >= _WIN32_WINNT_WIN8
+    struct precise_system_time_clock : details::system_time_clock_impl<decltype(&::GetSystemTimePreciseAsFileTime), ::GetSystemTimePreciseAsFileTime, system_time_clock> {};
+    using high_precision_system_time_clock = precise_system_time_clock;
+#else // _WIN32_WINNT < _WIN32_WINNT_WIN8
+    using high_precision_system_time_clock = system_time_clock;
+#endif // _WIN32_WINNT < _WIN32_WINNT_WIN8
+#pragma endregion
+
+#pragma region std::chrono wrappers for Query[Unbiased]InterruptTime[Precise]
+    namespace details
+    {
+        template<typename query_interrupt_time_fn_t, query_interrupt_time_fn_t query_interrupt_time_fn, class base_clock_t>
+        struct interrupt_time_clock_impl
+        {
+            using rep = LONGLONG;
+            using period = std::ratio_multiply<std::hecto, std::nano>;
+            using duration = std::chrono::duration<rep, period>;
+            using time_point = std::chrono::time_point<base_clock_t, duration>;
+            static constexpr bool const is_steady = true;
+
+            WI_NODISCARD static time_point now() WI_NOEXCEPT
+            {
+                ULONGLONG t;
+                query_interrupt_time_fn(&t);
+                return time_point{duration{ static_cast<rep>(t) }};
+            }
+        };
+    }
+
+#if _WIN32_WINNT >= 0x0601
+    struct unbiased_interrupt_time_clock : details::interrupt_time_clock_impl<decltype(&::QueryUnbiasedInterruptTime), ::QueryUnbiasedInterruptTime, unbiased_interrupt_time_clock> {};
+#if defined(NTDDI_WIN10)
+    struct interrupt_time_clock : details::interrupt_time_clock_impl<decltype(&::QueryInterruptTime), ::QueryInterruptTime, interrupt_time_clock> {};
+    struct precise_interrupt_time_clock : details::interrupt_time_clock_impl<decltype(&::QueryInterruptTimePrecise), ::QueryInterruptTimePrecise, interrupt_time_clock> {};
+    struct precise_unbiased_interrupt_time_clock : details::interrupt_time_clock_impl<decltype(&::QueryUnbiasedInterruptTimePrecise), ::QueryUnbiasedInterruptTimePrecise, unbiased_interrupt_time_clock> {};
+#endif
+#endif
+#pragma endregion
+
+    using cpu_time_duration = std::chrono::duration<LONGLONG, std::ratio_multiply<std::hecto, std::nano>>;
+
+    enum class cpu_time
+    {
+        total,
+        kernel,
+        user,
+    };
+
+    struct execution_times
+    {
+        system_time_clock::time_point creation_time;
+        system_time_clock::time_point exit_time;
+        cpu_time_duration kernel_time;
+        cpu_time_duration user_time;
+    };
+
+    namespace details
+    {
+        inline execution_times __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 execution_times_from_filetimes(FILETIME creation_time, FILETIME exit_time, FILETIME kernel_time, FILETIME user_time) WI_NOEXCEPT
+        {
+            return {
+                system_time_clock::from_filetime(creation_time),
+                system_time_clock::from_filetime(exit_time),
+                cpu_time_duration{ static_cast<cpu_time_duration::rep>(details::filetime_to_int(kernel_time)) },
+                cpu_time_duration{ static_cast<cpu_time_duration::rep>(details::filetime_to_int(user_time)) }
+            };
+        }
+
+        inline cpu_time_duration __WI_LIBCPP_CONSTEXPR_AFTER_CXX11 get_cpu_time(const execution_times& times, cpu_time kind) WI_NOEXCEPT
+        {
+            switch (kind)
+            {
+                case cpu_time::total: return times.kernel_time + times.user_time;
+                case cpu_time::kernel: return times.kernel_time;
+                case cpu_time::user: return times.user_time;
+                DEFAULT_UNREACHABLE;
+            }
+        }
+    }
+
+    using thread_times = execution_times;
+
+    template<class error_policy>
+    WI_NODISCARD thread_times get_thread_times(HANDLE thread = ::GetCurrentThread())
+    {
+        FILETIME creation_time;
+        FILETIME exit_time;
+        FILETIME kernel_time;
+        FILETIME user_time;
+
+        error_policy::Win32BOOL(::GetThreadTimes(thread, &creation_time, &exit_time, &kernel_time, &user_time));
+
+        return details::execution_times_from_filetimes(creation_time, exit_time, kernel_time, user_time);
+    }
+
+    WI_NODISCARD thread_times get_thread_times(HANDLE thread = ::GetCurrentThread())
+    {
+        return get_thread_times<err_exception_policy>(thread);
+    }
+
+    template<class error_policy>
+    WI_NODISCARD cpu_time_duration get_thread_cpu_time(HANDLE thread = ::GetCurrentThread(), cpu_time kind = cpu_time::total)
+    {
+        return details::get_cpu_time(get_thread_times<error_policy>(thread), kind);
+    }
+
+    WI_NODISCARD cpu_time_duration get_thread_cpu_time(HANDLE thread = ::GetCurrentThread(), cpu_time kind = cpu_time::total)
+    {
+        return get_thread_cpu_time<err_exception_policy>(thread, kind);
+    }
+
+    using process_times = execution_times;
+
+    template<class error_policy>
+    WI_NODISCARD process_times get_process_times(HANDLE process = ::GetCurrentProcess())
+    {
+        FILETIME creation_time;
+        FILETIME exit_time;
+        FILETIME kernel_time;
+        FILETIME user_time;
+
+        error_policy::Win32BOOL(::GetProcessTimes(process, &creation_time, &exit_time, &kernel_time, &user_time));
+
+        return details::execution_times_from_filetimes(creation_time, exit_time, kernel_time, user_time);
+    }
+
+    WI_NODISCARD process_times get_process_times(HANDLE process = ::GetCurrentProcess())
+    {
+        return get_process_times<err_exception_policy>(process);
+    }
+
+    template<class error_policy>
+    WI_NODISCARD cpu_time_duration get_process_cpu_time(HANDLE process = ::GetCurrentProcess(), cpu_time kind = cpu_time::total)
+    {
+        return details::get_cpu_time(get_process_times<error_policy>(process), kind);
+    }
+
+    WI_NODISCARD cpu_time_duration get_process_cpu_time(HANDLE process = ::GetCurrentProcess(), cpu_time kind = cpu_time::total)
+    {
+        return get_process_cpu_time<err_exception_policy>(process, kind);
+    }
+
+    struct current_thread_cpu_time_clock
+    {
+        using rep = cpu_time_duration::rep;
+        using period = cpu_time_duration::period;
+        using duration = cpu_time_duration;
+        using time_point = std::chrono::time_point<current_thread_cpu_time_clock, duration>;
+
+        template<class error_policy>
+        WI_NODISCARD static time_point now()
+        {
+            return time_point{ get_thread_cpu_time<error_policy>() };
+        }
+
+        WI_NODISCARD static time_point now()
+        {
+            return time_point{ now<err_exception_policy>() };
+        }
+    };
+
+    struct current_process_cpu_time_clock
+    {
+        using rep = cpu_time_duration::rep;
+        using period = cpu_time_duration::period;
+        using duration = cpu_time_duration;
+        using time_point = std::chrono::time_point<current_process_cpu_time_clock, duration>;
+
+        template<class error_policy>
+        WI_NODISCARD static time_point now()
+        {
+            return time_point{ get_process_cpu_time<error_policy>() };
+        }
+
+        WI_NODISCARD static time_point now()
+        {
+            return time_point{ now<err_exception_policy>() };
+        }
+    };
+}
+
+#endif // __WIL_CHRONO_INCLUDED