Gurchetan Singh | 876877a | 2023-08-07 15:15:58 -0700 | [diff] [blame] | 1 | /* |
| 2 | * C11 <time.h> implementation |
| 3 | * |
| 4 | * (C) Copyright yohhoy 2012. |
| 5 | * Copyright 2022 Yonggang Luo |
| 6 | * Distributed under the Boost Software License, Version 1.0. |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person or organization |
| 9 | * obtaining a copy of the software and accompanying documentation covered by |
| 10 | * this license (the "Software") to use, reproduce, display, distribute, |
| 11 | * execute, and transmit the Software, and to prepare [[derivative work]]s of the |
| 12 | * Software, and to permit third-parties to whom the Software is furnished to |
| 13 | * do so, all subject to the following: |
| 14 | * |
| 15 | * The copyright notices in the Software and this entire statement, including |
| 16 | * the above license grant, this restriction and the following disclaimer, |
| 17 | * must be included in all copies of the Software, in whole or in part, and |
| 18 | * all derivative works of the Software, unless such copies or derivative |
| 19 | * works are solely in the form of machine-executable object code generated by |
| 20 | * a source language processor. |
| 21 | * |
| 22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
| 25 | * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
| 26 | * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
| 27 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 28 | * DEALINGS IN THE SOFTWARE. |
| 29 | */ |
| 30 | |
| 31 | #include "c11/time.h" |
| 32 | |
| 33 | #ifdef _TIMESPEC_GET_NEED_IMPL |
| 34 | |
| 35 | #if defined(_WIN32) && !defined(HAVE_PTHREAD) |
| 36 | |
| 37 | #include "c11/threads.h" |
| 38 | #include <windows.h> |
| 39 | |
| 40 | static LARGE_INTEGER frequency; |
| 41 | |
| 42 | static |
| 43 | void |
| 44 | c23_timespec_get_init(void) |
| 45 | { |
| 46 | QueryPerformanceFrequency(&frequency); |
| 47 | } |
| 48 | |
| 49 | int |
| 50 | c23_timespec_get(struct timespec *ts, int base) |
| 51 | { |
| 52 | /* difference between 1970 and 1601 */ |
| 53 | #define _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS 116444736000000000ull |
| 54 | /* 1 tick is 100 nanoseconds */ |
| 55 | #define _TIMESPEC_IMPL_TICKS_PER_SECONDS 10000000ull |
| 56 | if (!ts) |
| 57 | return 0; |
| 58 | if (base == TIME_UTC) { |
| 59 | FILETIME ft; |
| 60 | ULARGE_INTEGER date; |
| 61 | LONGLONG ticks; |
| 62 | |
| 63 | GetSystemTimeAsFileTime(&ft); |
| 64 | date.HighPart = ft.dwHighDateTime; |
| 65 | date.LowPart = ft.dwLowDateTime; |
| 66 | ticks = (LONGLONG)(date.QuadPart - _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS); |
| 67 | ts->tv_sec = ticks / _TIMESPEC_IMPL_TICKS_PER_SECONDS; |
| 68 | ts->tv_nsec = (ticks % _TIMESPEC_IMPL_TICKS_PER_SECONDS) * 100; |
| 69 | return base; |
| 70 | } else if (base == TIME_MONOTONIC || base == TIME_MONOTONIC_RAW) { |
| 71 | if (frequency.QuadPart == 0) { |
| 72 | static once_flag once = ONCE_FLAG_INIT; |
| 73 | call_once(&once, c23_timespec_get_init); |
| 74 | } |
| 75 | if (frequency.QuadPart != 0) { |
| 76 | LARGE_INTEGER now; |
| 77 | LONGLONG sec; |
| 78 | LONGLONG nsec; |
| 79 | QueryPerformanceCounter(&now); |
| 80 | sec = now.QuadPart / frequency.QuadPart; |
| 81 | nsec = (now.QuadPart - sec * frequency.QuadPart) |
| 82 | * 1000000000UL / frequency.QuadPart; |
| 83 | ts->tv_sec = (time_t)sec; |
| 84 | ts->tv_nsec = (long)nsec; |
| 85 | return base; |
| 86 | } |
| 87 | /* Otherwise timespec_get with TIME_MONOTONIC or TIME_MONOTONIC_RAW failed */ |
| 88 | return 0; |
| 89 | } |
| 90 | return 0; |
| 91 | #undef _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS |
| 92 | #undef _TIMESPEC_IMPL_TICKS_PER_SECONDS |
| 93 | } |
| 94 | |
| 95 | #else |
| 96 | |
| 97 | int c23_timespec_get(struct timespec *ts, int base) |
| 98 | { |
| 99 | if (!ts) |
| 100 | return 0; |
| 101 | switch (base) |
| 102 | { |
| 103 | case TIME_UTC: |
| 104 | if (clock_gettime(CLOCK_REALTIME, ts) == 0) |
| 105 | return base; |
| 106 | break; |
| 107 | #ifdef CLOCK_MONOTONIC |
| 108 | case TIME_MONOTONIC: |
| 109 | if (clock_gettime(CLOCK_MONOTONIC, ts) == 0) |
| 110 | return base; |
| 111 | break; |
| 112 | #endif |
| 113 | #ifdef CLOCK_PROCESS_CPUTIME_ID |
| 114 | case TIME_ACTIVE: |
| 115 | if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, ts) == 0) |
| 116 | return base; |
| 117 | break; |
| 118 | #endif |
| 119 | #ifdef CLOCK_THREAD_CPUTIME_ID |
| 120 | case TIME_THREAD_ACTIVE: |
| 121 | if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, ts) == 0) |
| 122 | return base; |
| 123 | break; |
| 124 | #endif |
| 125 | #ifdef CLOCK_MONOTONIC_RAW |
| 126 | case TIME_MONOTONIC_RAW: |
| 127 | if (clock_gettime(CLOCK_MONOTONIC_RAW, ts) == 0) |
| 128 | return base; |
| 129 | break; |
| 130 | #endif |
| 131 | default: |
| 132 | break; |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | #endif |
| 137 | |
| 138 | #endif /* !HAVE_TIMESPEC_GET */ |