| /* |
| * Copyright 2022 Yonggang Luo |
| * SPDX-License-Identifier: MIT |
| * |
| * C11 <time.h> emulation library |
| */ |
| |
| #ifndef C11_TIME_H_INCLUDED_ |
| #define C11_TIME_H_INCLUDED_ |
| |
| #include <time.h> |
| |
| /*---------------------------- macros ---------------------------*/ |
| |
| /* Refer to https://htmlpreview.github.io/?https://icube-forge.unistra.fr/icps/c23-library/-/raw/main/README.html#time_monotonic-time_active-time_thread_active */ |
| #if defined(TIME_UTC) && \ |
| defined(TIME_MONOTONIC) && \ |
| defined(TIME_ACTIVE) && \ |
| defined(TIME_THREAD_ACTIVE) && \ |
| defined(TIME_MONOTONIC_RAW) |
| /* all needed time base is implemented */ |
| #else |
| #define _TIMESPEC_GET_NEED_IMPL |
| #endif |
| |
| #ifdef _TIMESPEC_GET_NEED_IMPL |
| #undef TIME_UTC |
| #undef TIME_MONOTONIC |
| #undef TIME_ACTIVE |
| #undef TIME_THREAD_ACTIVE |
| #undef TIME_MONOTONIC_RAW |
| /* c11 */ |
| #define TIME_UTC 1 |
| /* c23 */ |
| #define TIME_MONOTONIC 2 |
| #define TIME_ACTIVE 3 |
| #define TIME_THREAD_ACTIVE 4 |
| #define TIME_MONOTONIC_RAW 5 |
| #define timespec_get c23_timespec_get |
| #endif |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /*---------------------------- types ----------------------------*/ |
| |
| /* |
| * On MINGW `struct timespec` present but `timespec_get` may not present; |
| * On MSVC `struct timespec` and `timespec_get` present at the same time; |
| * So detecting `HAVE_STRUCT_TIMESPEC` in meson script dynamically. |
| */ |
| #ifndef HAVE_STRUCT_TIMESPEC |
| struct timespec |
| { |
| time_t tv_sec; // Seconds - >= 0 |
| long tv_nsec; // Nanoseconds - [0, 999999999] |
| }; |
| #endif |
| |
| /*-------------------------- functions --------------------------*/ |
| |
| #if defined(_TIMESPEC_GET_NEED_IMPL) |
| #define _TIMESPEC_GET_NEED_DECL |
| #elif defined(__APPLE__) && defined(__cplusplus) && (__cplusplus < 201703L) |
| /* On macOS, the guard for declaration of timespec_get is by |
| * (defined(__cplusplus) && __cplusplus >= 201703L), |
| * fix the declaration for C++14 and lower here |
| */ |
| #define _TIMESPEC_GET_NEED_DECL |
| #endif |
| |
| #ifdef _TIMESPEC_GET_NEED_DECL |
| /*-------------------- 7.25.7 Time functions --------------------*/ |
| // 7.25.6.1 |
| int |
| timespec_get(struct timespec *ts, int base); |
| #undef _TIMESPEC_GET_NEED_DECL |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* C11_TIME_H_INCLUDED_ */ |
